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Background And Basis Of Presentation (Schedule Of The Consolidated Statement Of Comprehensive Income Adjustments) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 30, 2012	Apr. 01, 2011
Background And Basis Of Presentation [Line Items]
Other	$ 4.7	$ (2.5)
Gain on SANYO Semiconductor acquisition		24.3
Net income attributable to ON Semiconductor Corporation	$ 28.2	$ 35.5
Basic	$ 0.06	$ 0.08
Diluted	$ 0.06	$ 0.08
As Revised [Member]
Background And Basis Of Presentation [Line Items]
Other		$ (2.5)
Gain on SANYO Semiconductor acquisition		24.3
Net income attributable to ON Semiconductor Corporation		$ 35.5
Basic		$ 0.08
Diluted		$ 0.08
As Reported [Member]
Background And Basis Of Presentation [Line Items]
Other		$ (0.2)
Gain on SANYO Semiconductor acquisition		61.3
Net income attributable to ON Semiconductor Corporation		$ 74.8
Basic		$ 0.17
Diluted		$ 0.16

- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 36, 37, 38
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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+ Details

- Definition

The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

+ References + Details

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Emerging Issues Task Force (EITF)
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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph 38
-Subparagraph a
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
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Reference 5: http://www.xbrl.org/2003/role/presentationRef
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Reference 6: http://www.xbrl.org/2003/role/presentationRef
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Reference 16: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph A7
-Appendix A

+ Details

Consolidated Balance Sheet - USD ($) $ in Millions	Mar. 30, 2012	Dec. 31, 2011
Assets
Cash and cash equivalents	$ 580.1	$ 652.9
Short-term investments	312.2	248.6
Receivables, net	425.3	457.2
Inventories	633.7	637.4
Other current assets	76.8	121.6
Deferred income taxes, net of allowances	10.3	10.0
Total current assets	2,038.4	2,127.7
Property, plant and equipment, net	1,155.5	1,109.5
Deferred income taxes, net of allowances	30.1	34.2
Goodwill	198.7	198.7
Intangible assets, net	325.8	337.2
Other assets	80.7	76.2
Total assets	3,829.2	3,883.5
Liabilities, Minority Interests and Stockholders' Equity
Accounts payable	408.6	451.8
Accrued expenses	238.5	239.8
Income taxes payable	2.8	7.5
Accrued interest	4.2	0.7
Deferred income on sales to distributors	153.5	172.0
Deferred income taxes, net of allowances	29.6	33.6
Current portion of long-term debt (See Note 6)	377.1	370.1
Total current liabilities	1,214.3	1,275.5
Long-term debt (See Note 6)	811.9	836.9
Other long-term liabilities	247.4	260.1
Deferred income taxes, net of allowances	21.1	17.5
Total liabilities	2,294.7	2,390.0
Commitments and contingencies (See Note 9)
ON Semiconductor Corporation stockholders' equity:
Common stock ($0.01 par value, 750,000,000 shares authorized, 505,423,125 and 502,452,084 shares issued, 453,664,087 and 451,284,220 shares outstanding, respectively)	5.1	5.0
Additional paid-in capital	3,125.6	3,113.5
Accumulated other comprehensive loss	(41.6)	(46.7)
Accumulated deficit	(1,174.1)	(1,202.3)
Less: treasury stock, at cost; 51,759,038 and 51,167,864 shares, respectively	(406.6)	(401.3)
Total ON Semiconductor Corporation stockholders' equity	1,508.4	1,468.2
Minority interests in consolidated subsidiaries	26.1	25.3
Total equity	1,534.5	1,493.5
Total liabilities and equity	$ 3,829.2	$ 3,883.5

Consolidated Statement Of Cash Flows - USD ($) $ in Millions	3 Months Ended
	Mar. 30, 2012	Apr. 01, 2011
Cash flows from operating activities:
Net income	$ 29.0	$ 36.2
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	61.1	52.8
Gain on sale and disposal of fixed assets	(1.5)	(2.1)
Non-cash manufacturing expenses associated with favorable supply agreement		50.0
Gain on acquisition of SANYO Semiconductor		(24.3)
Amortization of debt issuance costs and debt discount	0.5	0.6
Provision for excess inventories	15.8	1.7
Non-cash stock compensation expense	7.4	10.4
Non-cash interest	7.2	8.7
Deferred income taxes	3.2	3.2
Other	(0.5)	(1.0)
Changes in assets and liabilities (exclusive of the impact of acquisitions):
Receivables	27.3	(36.0)
Inventories	(23.2)	24.7
Other assets	30.2	25.1
Accounts payable	(81.2)	(18.3)
Accrued expenses	13.1	(29.3)
Income taxes payable	(4.7)	(3.0)
Accrued interest	3.5	3.7
Deferred income on sales to distributors	(18.5)	20.0
Other long-term liabilities	(0.3)	2.5
Net cash provided by operating activities	68.4	125.6
Cash flows from investing activities:
Purchases of property, plant and equipment	(50.4)	(88.7)
Purchase of businesses, net of cash acquired		(57.6)
Proceeds from sales of property, plant and equipment	1.9
Deposits utilized for purchases of property, plant and equipment	(9.6)
Recovery from insurance on property, plant and equipment	11.5
Proceeds from held-to-maturity securities	99.7
Purchase of held-to-maturity securities	(163.3)
Change in restricted cash		142.1
Net cash used in investing activities	(110.2)	(4.2)
Cash flows from financing activities:
Proceeds from issuance of common stock under the employee stock purchase plan		1.9
Proceeds from debt issuance	2.0	15.2
Proceeds from exercise of stock options	4.8	41.1
Payment of capital lease obligation	(11.4)	(9.9)
Purchase of treasury stock	(5.3)	(7.6)
Repayment of long-term debt	(15.6)	(19.6)
Net cash (used in) provided by financing activities	(25.5)	21.1
Effect of exchange rate changes on cash and cash equivalents	(5.5)	0.2
Net (decrease) increase in cash and cash equivalents	(72.8)	142.7
Cash and cash equivalents, beginning of period	652.9	623.3
Cash and cash equivalents, end of period	$ 580.1	$ 766.0

Earnings Per Share And Equity (Income Per Share Calculations) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 30, 2012	Apr. 01, 2011
Earnings Per Share And Equity [Abstract]
Net income applicable to ON Semiconductor Corporation	$ 28.2	$ 35.5
Basic weighted average common shares outstanding	452.5	441.4
Dilutive effect of stock options and awards	5.1	10.8
Dilutive effect of convertible notes	3.0	3.8
Diluted weighted average common shares outstanding	460.6	456.0
Basic	$ 0.06	$ 0.08
Diluted	$ 0.06	$ 0.08

- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

+ References

+ Details

- Definition

+ References + Details

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References

+ Details

- Definition

The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

+ References + Details

- Definition

Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 171
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 40
-Subparagraph a
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 8
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
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Reference 5: http://www.xbrl.org/2003/role/presentationRef
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Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Weighted-Average Number of Common Shares Outstanding
-URI http://asc.fasb.org/extlink&oid=6528421

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Emerging Issues Task Force (EITF)
-Number 07-4
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+ Details

Guarantor And Non-Guarantor Statements (Notes To Consolidated Statement Of Operations And Cash Flow) (Details) - USD ($)
$ in Millions

3 Months Ended

Mar. 30, 2012

Apr. 01, 2011

Condensed Financial Statements, Captions [Line Items]

Revenues

$ 744.4

$ 870.6

Cost of product revenues

499.2

628.2

Gross profit

245.2

242.4

Research and development

91.4

91.1

Selling and marketing

45.6

49.4

General and administrative

42.0

47.1

Amortization of acquisition related intangible assets

11.1

9.7

Restructuring, asset impairments and other, net

11.5

12.4

Total operating expenses

201.6

209.7

Operating income (loss)

43.6

32.7

Interest expense

(15.7)

(17.8)

Interest income

0.5

0.3

Other

4.7

(2.5)

Gain (loss) on SANYO Semiconductor acquisition

24.3

Income before income taxes

33.1

37.0

Income tax provision

(4.1)

(0.8)

Net income

29.0

36.2

Net income (loss) attributable to minority interests

(0.8)

(0.7)

Net income attributable to ON Semiconductor Corporation

28.2

35.5

Foreign currency translation adjustments

4.9

0.4

Effects of cash flow hedges

(0.4)

Unrealized gain on available-for-sale securities

0.5

Amortization of prior service costs of defined benefit plan

0.1

Comprehensive income

34.1

36.6

Comprehensive income attributable to minority interests

(0.8)

(0.7)

Comprehensive income attributable to ON Semiconductor Corporation

33.3

35.9

Net cash (used in) provided by operating activities

68.4

125.6

Purchases of property, plant and equipment

(50.4)

(88.7)

Proceeds from sales of property, plant and equipment

1.9

Purchase of businesses, net of cash acquired

(57.6)

Deposits utilized for purchases of property, plant and equipment

(9.6)

Recovery from insurance on property, plant and equipment

11.5

Proceeds from held-to-maturity securities

99.7

Purchase of held-to-maturity securities

(163.3)

Change in restricted cash

142.1

Net cash used in investing activities

(110.2)

(4.2)

Proceeds from issuance of common stock under the employee stock purchase plan

1.9

Proceeds from debt issuance

2.0

15.2

Proceeds from exercise of stock options

4.8

41.1

Payment of capital lease obligation

(11.4)

(9.9)

Purchase of treasury stock

(5.3)

(7.6)

Repayment of long term debt

(15.6)

(19.6)

Net cash (used in) provided by financing activities

(25.5)

21.1

Effect of exchange rate changes on cash and cash equivalents

(5.5)

0.2

Net increase (decrease) in cash and cash equivalents

(72.8)

142.7

Cash and cash equivalents, beginning of period

652.9

623.3

Cash and cash equivalents, end of period

580.1

766.0

Issuer [Member]

Condensed Financial Statements, Captions [Line Items]

Interest expense

^[1]

(10.9)

(12.9)

Equity in earnings

^[1]

39.1

48.4

Income before income taxes

^[1]

28.2

35.5

Net income

^[1]

28.2

35.5

Net income attributable to ON Semiconductor Corporation

^[1]

28.2

35.5

Foreign currency translation adjustments

^[1]

4.9

0.4

Effects of cash flow hedges

^[1]

(0.4)

Unrealized gain on available-for-sale securities

^[1]

0.5

Amortization of prior service costs of defined benefit plan

^[1]

0.1

Comprehensive income

^[1]

33.3

35.9

Comprehensive income attributable to ON Semiconductor Corporation

^[1]

33.3

35.9

SCI LLC [Member]

Condensed Financial Statements, Captions [Line Items]

Revenues

185.6

208.6

Cost of product revenues

116.1

154.9

Gross profit

69.5

53.7

Research and development

43.2

59.3

Selling and marketing

17.1

21.4

General and administrative

15.2

27.4

Amortization of acquisition related intangible assets

4.5

4.4

Total operating expenses

80.0

112.5

Operating income (loss)

(10.5)

(58.8)

Interest expense

(2.3)

(2.2)

Interest income

0.3

0.1

Other

6.2

4.1

Gain (loss) on SANYO Semiconductor acquisition

24.3

Equity in earnings

34.9

42.6

Income before income taxes

28.6

10.1

Income tax provision

8.5

12.2

Net income

37.1

22.3

Net income attributable to ON Semiconductor Corporation

37.1

22.3

Foreign currency translation adjustments

0.8

0.4

Effects of cash flow hedges

(0.4)

Comprehensive income

37.5

22.7

Comprehensive income attributable to ON Semiconductor Corporation

37.5

22.7

Net cash (used in) provided by operating activities

(31.3)

69.3

Purchases of property, plant and equipment

(11.2)

(20.9)

Purchase of businesses, net of cash acquired

53.0

Proceeds from held-to-maturity securities

99.7

Purchase of held-to-maturity securities

(163.3)

Change in restricted cash

142.1

Net cash used in investing activities

(74.8)

174.2

Intercompany loans

(23.3)

(375.1)

Intercompany loan repayments

70.2

144.8

Proceeds from issuance of common stock under the employee stock purchase plan

1.9

Proceeds from exercise of stock options

4.8

41.1

Payment of capital lease obligation

(11.0)

(10.0)

Purchase of treasury stock

(5.3)

(7.6)

Repayment of long term debt

(1.1)

(0.3)

Net cash (used in) provided by financing activities

34.3

(205.2)

Net increase (decrease) in cash and cash equivalents

(71.8)

38.3

Cash and cash equivalents, beginning of period

304.5

392.3

Cash and cash equivalents, end of period

232.7

430.6

Other Subsidiaries [Member]

Condensed Financial Statements, Captions [Line Items]

Cost of product revenues

0.2

0.3

Gross profit

(0.2)

(0.3)

Research and development

2.6

3.0

Selling and marketing

0.2

0.3

General and administrative

0.2

Total operating expenses

3.0

3.5

Operating income (loss)

(3.2)

(3.8)

Equity in earnings

1.9

1.7

Income before income taxes

(1.3)

(2.1)

Net income

(1.3)

(2.1)

Net income attributable to ON Semiconductor Corporation

(1.3)

(2.1)

Comprehensive income

(1.3)

(2.1)

Comprehensive income attributable to ON Semiconductor Corporation

(1.3)

(2.1)

Net cash (used in) provided by operating activities

(0.2)

(0.1)

Purchases of property, plant and equipment

(0.5)

(0.1)

Net cash used in investing activities

(0.5)

(0.1)

Net increase (decrease) in cash and cash equivalents

(0.7)

(0.2)

Cash and cash equivalents, beginning of period

(0.2)

Cash and cash equivalents, end of period

(0.9)

(0.2)

Non-Guarantor Subsidiaries [Member]

Condensed Financial Statements, Captions [Line Items]

Revenues

893.5

1,003.1

Cost of product revenues

708.1

805.9

Gross profit

185.4

197.2

Research and development

45.6

28.8

Selling and marketing

28.3

27.7

General and administrative

26.6

19.5

Amortization of acquisition related intangible assets

7.6

6.3

Restructuring, asset impairments and other, net

11.5

12.4

Total operating expenses

119.6

94.7

Operating income (loss)

65.8

102.5

Interest expense

(2.5)

(2.7)

Interest income

0.2

Other

(1.5)

(6.6)

Income before income taxes

62.0

93.4

Income tax provision

(12.6)

(13.0)

Net income

49.4

80.4

Net income attributable to ON Semiconductor Corporation

49.4

80.4

Foreign currency translation adjustments

4.1

Unrealized gain on available-for-sale securities

0.5

Amortization of prior service costs of defined benefit plan

0.1

Comprehensive income

54.1

80.4

Comprehensive income attributable to ON Semiconductor Corporation

54.1

80.4

Net cash (used in) provided by operating activities

99.9

56.4

Purchases of property, plant and equipment

(38.7)

(67.7)

Proceeds from sales of property, plant and equipment

1.9

Purchase of businesses, net of cash acquired

(110.6)

Deposits utilized for purchases of property, plant and equipment

(9.6)

Recovery from insurance on property, plant and equipment

11.5

Net cash used in investing activities

(34.9)

(178.3)

Intercompany loans

23.3

375.1

Intercompany loan repayments

(70.2)

(144.8)

Proceeds from debt issuance

2.0

15.2

Payment of capital lease obligation

(0.4)

0.1

Repayment of long term debt

(14.5)

(19.3)

Net cash (used in) provided by financing activities

(59.8)

226.3

Effect of exchange rate changes on cash and cash equivalents

(5.5)

0.2

Net increase (decrease) in cash and cash equivalents

(0.3)

104.6

Cash and cash equivalents, beginning of period

348.6

231.0

Cash and cash equivalents, end of period

348.3

335.6

Eliminations [Member]

Condensed Financial Statements, Captions [Line Items]

Revenues

(334.7)

(341.1)

Cost of product revenues

(325.2)

(332.9)

Gross profit

(9.5)

(8.2)

Amortization of acquisition related intangible assets

(1.0)

Total operating expenses

(1.0)

Operating income (loss)

(8.5)

(7.2)

Equity in earnings

(75.9)

(92.7)

Income before income taxes

(84.4)

(99.9)

Net income

(84.4)

(99.9)

Net income (loss) attributable to minority interests

(0.8)

(0.7)

Net income attributable to ON Semiconductor Corporation

(85.2)

(100.6)

Foreign currency translation adjustments

(4.9)

(0.4)

Effects of cash flow hedges

0.4

Unrealized gain on available-for-sale securities

(0.5)

Amortization of prior service costs of defined benefit plan

(0.1)

Comprehensive income

(89.5)

(100.3)

Comprehensive income attributable to minority interests

(0.8)

(0.7)

Comprehensive income attributable to ON Semiconductor Corporation

$ (90.3)

$ (101.0)

[1]	ON Semiconductor is a holding company and has no operations apart from those of its operating subsidiaries. Additionally, ON Semiconductor does not maintain a bank account; rather SCI LLC, its primary domestic operating subsidiary, processes all of its cash receipts and disbursements on its behalf.

New Accounting Pronouncements	3 Months Ended
New Accounting Pronouncements	Mar. 30, 2012
New Accounting Pronouncements [Abstract]
New Accounting Pronouncements	Note 3: New Accounting Pronouncements ASU No. 2011-05, "Comprehensive Income (Topic 220): Presentation of Comprehensive Income" ("ASU 2011-05") and ASU 2011-12, "Comprehensive Income (Topic 220): Deferral of the Effective Date for Amendments to the Presentation of Reclassifications of Items Out of Accumulated Other Comprehensive Income in Accounting Standards Update No. 2011-05" ("ASU 2011-12") ASU 2011-05 allows an entity to present components of net income and other comprehensive income in one continuous statement, referred to as the statement of comprehensive income, or in two separate, but consecutive statements. The new guidance eliminated the previous option to report other comprehensive income and its components in the statement of changes in equity. While ASU 2011-05 changes the presentation of comprehensive income, there were no changes to the components that are recognized in net income or other comprehensive income under current accounting guidance. The Company adopted this guidance effective in the first quarter of fiscal 2012. The adoption of ASU 2011-05 and the deferrals in ASU 2011-12 did not have a material impact on the Company's Consolidated Financial Statements.

Segment Information (Narrative) (Details)	3 Months Ended
Segment Information (Narrative) (Details)	Mar. 30, 2012 segment	Apr. 01, 2011
Segment Information [Abstract]
Number of customers with greater than ten percent of total revenue	0	0
Number of segments	4
Customers' revenue as percentage of total revenue	10.00%	10.00%

Long-Term Debt (Long-Term Debt) (Details) - USD ($)
$ in Millions

3 Months Ended

Mar. 30, 2012

Apr. 16, 2012

Dec. 31, 2011

Debt Instrument [Line Items]

Long-term debt, including current maturities

$ 1,189.0

$ 1,207.0

Less: Current maturities

(377.1)

(370.1)

Long-term debt

811.9

836.9

Senior Revolving Credit Facility [Member]

Debt Instrument [Line Items]

Credit facility, maximum borrowing capacity

325.0

Loan With A Japanese Company Due 2012 Through 2018, Interest Payable Quarterly At 2.33% [Member]

Debt Instrument [Line Items]

Long-term debt, including current maturities

^[1]

$ 330.3

$ 339.8

Debt instrument, interest rate

2.22%

2.33%

Debt instrument maturity year, start

2012

Debt instrument maturity year, end

2018

Zero Coupon Convertible Senior Subordinated Notes Due 2024 [Member]

Debt Instrument [Line Items]

Long-term debt, including current maturities

^[2]

$ 95.9

$ 94.2

Debt instrument, maturity year

2024

Debt instrument, interest rate

0.00%

Debt instrument, discount

$ 0.3

2.0

1.875% Convertible Senior Subordinated Notes Due 2025 [Member]

Debt Instrument [Line Items]

Long-term debt, including current maturities

^[3]

$ 90.1

88.4

Debt instrument, maturity year

2025

Debt instrument, interest rate

1.875%

Debt instrument, discount

$ 4.9

6.6

2.625% Convertible Senior Subordinated Notes Due 2026 [Member]

Debt Instrument [Line Items]

Long-term debt, including current maturities

^[4]

$ 210.8

207.9

Debt instrument, maturity year

2026

Debt instrument, interest rate

2.625%

Debt instrument, discount

$ 21.6

24.5

2.625% Convertible Senior Subordinated Notes Due 2026, Series B [Member]

Debt Instrument [Line Items]

Long-term debt, including current maturities

^[5]

$ 177.5

176.6

Debt instrument, maturity year

2026

Debt instrument, interest rate

2.625%

Debt instrument, discount

$ 21.1

22.0

Loan With Hong Kong Bank, Interest Payable Weekly [Member]

Debt Instrument [Line Items]

Long-term debt, including current maturities

$ 40.0

Debt instrument, interest rate

1.99%

2.04%

Loans With Philippine Banks Due 2012 Through 2015, Interest Payable Monthly And Quarterly At An Average Rate Of 2.01% And 1.80% [Member]

Debt Instrument [Line Items]

Long-term debt, including current maturities

$ 65.5

$ 68.2

Debt instrument, interest rate

2.01%

Debt instrument maturity year, start

2012

Debt instrument maturity year, end

2015

Loans With Chinese Banks Due 2013, Interest Payable Quarterly [Member]

Debt Instrument [Line Items]

Long-term debt, including current maturities

$ 7.0

Debt instrument, maturity year

2013

Debt instrument, interest rate

4.33%

4.44%

Loans With Japanese Banks Due Through 2013, Interest Payable Monthly And Semi-Annually [Member]

Debt Instrument [Line Items]

Long-term debt, including current maturities

$ 3.1

$ 3.5

Debt instrument, interest rate

1.72%

1.71%

Debt instrument maturity year, end

2013

Loan With Singapore Bank, Interest Payable Weekly [Member]

Debt Instrument [Line Items]

Long-term debt, including current maturities

$ 27.0

$ 25.0

Debt instrument, interest rate

1.97%

Loan With British Finance Company, Interest Payable Monthly [Member]

Debt Instrument [Line Items]

Long-term debt, including current maturities

$ 10.9

$ 13.1

Debt instrument, interest rate

1.95%

2.42%

U.S. Real Estate Mortgages Payable Monthly Through 2016 At An Average Rate Of 4.86% [Member]

Debt Instrument [Line Items]

Long-term debt, including current maturities

$ 31.2

$ 31.6

Debt instrument, maturity year

2016

Debt instrument, interest rate

4.857%

U.S. Equipment Financing Payable Monthly Through 2015 At 3.23% [Member]

Debt Instrument [Line Items]

Long-term debt, including current maturities

$ 10.1

10.8

Debt instrument, maturity year

2015

Debt instrument, interest rate

3.23%

Capital Lease Obligations [Member]

Debt Instrument [Line Items]

Long-term debt, including current maturities

$ 89.6

$ 100.9

[1]	This loan represents Semiconductor Component Industries, LLC ("SCI LLC") unsecured loan with SANYO Electric, which is guaranteed by the Company.
[2]	The Zero Coupon Convertible Senior Subordinated Notes due 2024 may be put back to the Company at the option of the holders of the notes on April 15 of 2012, 2014 and 2019 or called at the option of the Company on or after April 15, 2012. See Note 15: "Subsequent Events" of this Form 10-Q for the discussion of the retirement of the Zero Coupon Convertible Senior Subordinated Notes due 2024.
[3]	The 1.875% Convertible Senior Subordinated Notes due 2025 may be put back to the Company at the option of the holders of the notes on December 15 of 2012, 2015 and 2020 or called at the option of the Company on or after December 20, 2012.
[4]	The 2.625% Convertible Senior Subordinated Notes due 2026 may be put back to the Company at the option of the holders of the notes on December 15 of 2013, 2016 and 2021 or called at the option of the Company on or after December 20, 2013.
[5]	The 2.625% Convertible Senior Subordinated Notes due 2026, Series B may be put back to the Company at the option of the holders of the notes on December 15 of 2016 and 2021 or called at the option of the Company on or after December 20, 2016.

Fair Value Of Financial Instruments

3 Months Ended

Mar. 30, 2012

Fair Value Of Financial Instruments [Abstract]

Fair Value Of Financial Instruments

Note 10: Fair Value of Financial Instruments

The following table summarizes the Company's financial assets and liabilities measured at fair value on a recurring basis as of March 30, 2012 and December 31, 2011 (in millions):


	March 30, 2012		Quoted Prices in Active Markets (Level 1)		Balance as of December 31, 2011		Quoted Prices in Active Markets (Level 1)
Description
Assets:
Cash and cash equivalents:
Demand and time deposits	$	431.0	$	431.0	$	455.3	$	455.3
Treasuries		92.6		92.6		131.1		131.1
Commercial paper		54.2		54.2		50.9		50.9
Corporate bonds		2.3		2.3		15.6		15.1
Other Current Assets
Foreign currency exchange contracts	$	0.4	$	0.4	$	0.7	$	0.7

Liabilities:
Foreign currency exchange contracts	$	0.2	$	0.2	$	0.1	$	0.1

The Company's financial assets and liabilities are valued using market prices on active markets (Level 1). Level 1 instrument valuations are obtained from real-time quotes for transactions in active exchange markets involving identical assets. Cash and cash equivalents are short-term, highly liquid investments with original or remaining maturities of three months or less when purchased. The Company's short-term investments balance of $312.2 million is classified as held-to-maturity securities and is carried at amortized cost, which excludes $0.2 million of unrealized losses as of March 30, 2012.

The carrying amounts of other current assets and liabilities, such as accounts receivable and accounts payable, approximate fair value based on the short-term nature of these instruments.

As of March 30, 2012, the Company held no direct investments in auction rate securities, collateralized debt obligations, structured investment vehicles or mortgage-backed securities.

Long-Term Debt, Including Current Portion

The carrying amounts and fair values of the Company's long-term borrowings (excluding capital lease obligations, real estate mortgages and equipment financing) at March 30, 2012 and December 31, 2011 are as follows (in millions):


	March 30, 2012				December 31, 2011
	Carrying Amount		Fair Value		Carrying Amount		Fair Value
Long-term debt, including current portion
Convertible Notes	$	574.3	$	716.5	$	567.1	$	683.9
Long-term debt	$	483.9	$	453.3	$	496.6	$	462.0

The fair value of the Convertible Notes was estimated based on quoted market prices. The fair value of other long-term debt was estimated based on discounting the remaining principal and interest payments using current market rates for similar debt and consideration of credit and default risk at March 30, 2012 and December 31, 2011.

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 133
-Paragraph 44A, 44B
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 107
-Paragraph 15C, 15D
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 107
-Paragraph 15A
-Subparagraph a-d
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 107
-Paragraph 15B
-Subparagraph a, b
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 107
-Paragraph 3, 10, 14, 15
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 157
-Paragraph 32, 33, 34
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 159
-Paragraph 17-22, 27, 28
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6925170&loc=d3e19207-110258

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 21
-URI http://asc.fasb.org/extlink&oid=6947722&loc=d3e13537-108611

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 28
-URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14064-108612

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=6947722&loc=d3e13433-108611

Reference 12: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 30
-URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14172-108612

Reference 13: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 16
-URI http://asc.fasb.org/extlink&oid=6947722&loc=d3e13504-108611

Reference 14: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6925170&loc=d3e19296-110258

+ Details

Financial Instruments (Schedule Of Net Foreign Exchange Positions) (Details) - USD ($) $ in Millions	Mar. 30, 2012	Dec. 31, 2011
Financial Instruments [Line Items]
Buy (Sell)	$ (78.8)	$ (106.6)
Notional Amount of Foreign Currency Derivatives	170.2	203.4
Chinese Renminbi [Member]
Financial Instruments [Line Items]
Buy (Sell)	(8.4)	(12.8)
Notional Amount of Foreign Currency Derivatives	8.4	12.8
Euro [Member]
Financial Instruments [Line Items]
Buy (Sell)	(38.2)	(30.8)
Notional Amount of Foreign Currency Derivatives	38.2	30.8
Japanese Yen [Member]
Financial Instruments [Line Items]
Buy (Sell)	(68.5)	(100.0)
Notional Amount of Foreign Currency Derivatives	68.5	100.0
Malaysian Ringgit [Member]
Financial Instruments [Line Items]
Buy (Sell)	29.4	29.4
Notional Amount of Foreign Currency Derivatives	29.4	29.4
Other Currencies [Member]
Financial Instruments [Line Items]
Buy (Sell)	6.9	7.6
Notional Amount of Foreign Currency Derivatives	$ 25.7	$ 30.4

Share-Based Compensation (Narrative) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 30, 2012	Apr. 01, 2011	Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total Intrinsic value of stock options exercised	$ 3.4
Cash received from exercise of stock options	$ 4.8	$ 41.1
Employee Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average fair value assumptions on stock options granted	$ 3.41	$ 4.22
Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Estimated pre-vesting forfeitures	4.00%	12.00%
Amended And Restated SIP [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate of common stock available for grant	11.5		17.4
Time-Based Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized share-based compensation expense on non-vested stock options	$ 45.9
Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for issuance	4.1		4.1
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized share-based compensation expense on non-vested stock options	$ 10.0
Estimated pre-vesting forfeitures	11.00%	12.00%
Maximum [Member] \| Amended And Restated SIP [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period of options	3 years
Minimum [Member] \| Amended And Restated SIP [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period of options	1 year

Segment Information (Reconciliation Of Operating Profit (Loss) From Segments To Consolidated) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 30, 2012	Apr. 01, 2011
Segment Information [Abstract]
Gross profit for reportable segments	$ 257.2	$ 258.6
Other unallocated manufacturing costs	(12.0)	(16.2)
Gross profit	245.2	242.4
Operating income for reportable segments	67.1	71.7
RestructuringSettlementAndImpairmentProvisions	11.5	12.4
Other unallocated operating expenses		(10.4)
Operating income	$ 43.6	$ 32.7

Balance Sheet Information (Tables)

3 Months Ended

Mar. 30, 2012

Balance Sheet Information [Abstract]

Supplemental Balance Sheet Information


	March 30, 2012			December 31, 2011
	(in millions)			(in millions)
Receivables, net:
Accounts receivable	$	431.6		$	464.3
Less: Allowance for doubtful accounts		(6.3	)		(7.1	)

	$	425.3		$	457.2

Inventories:
Raw materials	$	61.8		$	58.8
Work in process		414.2			430.8
Finished goods		157.7			147.8

	$	633.7		$	637.4

Property, plant and equipment, net:
Land	$	74.3		$	76.6
Buildings		537.7			539.3
Machinery and equipment		1,997.6			1,943.0

Total property, plant and equipment		2,609.6			2,558.9
Less: Accumulated depreciation		(1,454.1	)		(1,449.4	)

	$	1,155.5		$	1,109.5

Accrued expenses:
Accrued payroll	$	127.9		$	125.2
Sales related reserves		53.8			45.5
Restructuring reserves		24.2			17.3
Accrued pension liability		9.8			11.4
Other		22.8			40.4

	$	238.5		$	239.8

Accumulated other comprehensive loss:
Foreign currency translation adjustments	$	(41.6	)	$	(46.5	)
Unrecognized prior service cost of defined benefit pension plan		(0.1	)		(0.2	)
Effect of cash flow hedges		(0.4	)		—
Unrealized gain on available for sale securities		0.5			—

	$	(41.6	)	$	(46.7	)

Warranty Reserves


	Quarter Ended
	March 30, 2012			April 1, 2011
Beginning Balance	$	5.8		$	3.3
Provision		0.1			0.6
Usage		(0.2	)		—

Ending Balance	$	5.7		$	3.9

Summary Of Net Periodic Pension Cost


	Quarter Ended
	March 30, 2012			April 1, 2011
Service cost	$	2.2		$	2.3
Interest cost		1.3			1.3
Expected return on plan assets		(1.0	)		(1.0	)
Amortization of prior service cost		0.1			0.1

Total net periodic pension cost	$	2.6		$	2.7

Balance Sheet Information (Supplemental Balance Sheet Information) (Details) - USD ($) $ in Millions	Mar. 30, 2012	Dec. 31, 2011
Receivables, net:
Accounts receivable	$ 431.6	$ 464.3
Less: Allowance for doubtful accounts	(6.3)	(7.1)
Accounts receivable, net	425.3	457.2
Inventories:
Raw materials	61.8	58.8
Work in process	414.2	430.8
Finished goods	157.7	147.8
Inventories, net	633.7	637.4
Property, plant and equipment, net:
Land	74.3	76.6
Buildings	537.7	539.3
Machinery and equipment	1,997.6	1,943.0
Total property, plant and equipment	2,609.6	2,558.9
Less: Accumulated depreciation	(1,454.1)	(1,449.4)
Property, plant and equipment, net	1,155.5	1,109.5
Accrued expenses:
Accrued payroll	127.9	125.2
Sales related reserves	53.8	45.5
Restructuring reserves	24.2	17.3
Accrued pension liability	9.8	11.4
Other	22.8	40.4
Total accrued expenses	238.5	239.8
Accumulated other comprehensive loss:
Foreign currency translation adjustments	(41.6)	(46.5)
Unrecognized prior service cost of defined benefit pension plan	(0.1)	(0.2)
Effect of cash flow hedges	(0.4)
Unrealized gain on available for sale securities	0.5
Total accumulated other comprehensive loss	$ (41.6)	$ (46.7)

Supplemental Disclosures Of Cash Flow Information (Non-Cash Financing Activities And Cash Payments) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 30, 2012	Apr. 01, 2011
Supplemental Disclosure Of Cash Flow Information [Abstract]
Capital expenditures in accounts payable	$ 105.0	$ 55.1
Equipment acquired or refinanced through capital leases		8.3
Interest income	(0.5)	(0.3)
Interest expense	8.5	9.1
Income taxes	$ 4.6	$ 2.1

Restructuring, Asset Impairments And Other, Net (Tables)

3 Months Ended

Mar. 30, 2012

Restructuring, Asset Impairments And Other, Net [Abstract]

Reconciliation Of "Restructuring, Asset Impairments And Other, Net" Caption On The Consolidated Statement Of Operations


	Restructuring		Other		Total
Three months ended March 30, 2012
Thailand facility closure	$	1.5	$	1.8	$	3.3
Aizu facility closure		5.8		0.1		5.9
SANYO Semiconductor consolidation		—		2.3		2.3

Total	$	7.3	$	4.2	$	11.5

Rollforward Of Accrued Restructuring Charges


	Balance as of December 31, 2011		Charges		Usage			Adjustments			Balance as of March 30, 2012
Estimated employee separation charges:	$	8.9	$	7.3	$	(1.5	)	$	(0.8	)	$	13.9

Estimated costs to exit:	$	8.4	$	2.4	$	(0.5	)	$	—		$	10.3

Long-Term Debt (Annual Maturities Relating To Long-Term Debt) (Details) $ in Millions	Mar. 30, 2012 USD ($)
Long-Term Debt [Abstract]
Remainder of 2012	$ 353.7
2013	328.6
2014	75.3
2015	63.5
2016	262.2
Thereafter	153.6
Total	$ 1,236.9

Share-Based Compensation (Weighted-Average Assumptions Of Employee Stock Options) (Details) - Employee Stock Options [Member] - yr	3 Months Ended
	Mar. 30, 2012	Apr. 01, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Volatility	46.70%	41.00%
Risk-free interest rate	0.90%	2.10%
Expected term	4.8	4.9

Share-Based Compensation (Summary Of Stock Option Plans) (Details) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 30, 2012 USD ($) yr $ / shares shares
Share-Based Compensation [Abstract]
Number of Shares, Outstanding at December 31, 2011 \| shares	18.7
Weighted-Average Exercise Price, Outstanding at December 31, 2011 \| $ / shares	$ 7.70
Number of Shares, Granted \| shares	1.4
Weighted-Average Exercise Price, Granted \| $ / shares	$ 8.40
Number of Shares, Exercised \| shares	(0.9)
Weighted-Average Exercise Price, Exercised \| $ / shares	$ 4.99
Number of Shares, Cancelled \| shares	(0.2)
Weighted-Average Exercise Price, Cancelled \| $ / shares	$ 7.63
Number of Shares, Outstanding at March 30, 2012 \| shares	19.0
Weighted-Average Exercise Price, Outstanding at March 30, 2012 \| $ / shares	$ 7.88
Weighted Average Remaining Contractual Term (in years), Outstanding at March 30, 2012 \| yr	4.6
Aggregate Intrinsic Value, Outstanding at December 31, 2011 \| $	$ 29.8
Number of Shares, Exercisable at March 30, 2012 \| shares	14.8
Weighted-Average Exercise Price, Exercisable at March 30, 2012 \| $ / shares	$ 7.84
Weighted-Average Remaining Contractual Term (in years), Exercisable at March 30, 2012 \| yr	4.1
Aggregate Intrinsic Value (In-The-Money), Exercisable at March 30, 2012 \| $	$ 25.2

Balance Sheet Information (Summary Of Net Periodic Pension Cost) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 30, 2012	Apr. 01, 2011
Balance Sheet Information [Abstract]
Service cost	$ 2.2	$ 2.3
Interest cost	1.3	1.3
Expected return on plan assets	(1.0)	(1.0)
Amortization of prior service cost	0.1	0.1
Total net periodic pension cost	$ 2.6	$ 2.7

- Definition

An amount calculated as a basis for determining the extent of delayed recognition of the effects of changes in the fair value of assets. The expected return on plan assets is determined based on the expected long-term rate of return on plan assets and the market-related value of plan assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5
-Subparagraph h
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 106
-Paragraph 518
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 87
-Paragraph 264
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (h)(3)
-URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e1928-114920

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Expected Return on Plan Assets
-URI http://asc.fasb.org/extlink&oid=6512136
-Topic 715
-SubTopic 30

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Expected Return on Plan Assets
-URI http://asc.fasb.org/extlink&oid=6512171
-Topic 715
-SubTopic 60

+ Details

- Definition

The increase in a defined benefit pension plan's projected benefit obligation or a defined benefit postretirement plan's accumulated postretirement benefit obligation due to the passage of time.

+ References + Details

- Definition

The actuarial present value of benefits attributed by the pension benefit formula to services rendered by employees during the period. The portion of the expected postretirement benefit obligation attributed to employee service during the period. The service cost component is a portion of the benefit obligation and is unaffected by the funded status of the plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 106
-Paragraph 518
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 87
-Paragraph 264
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5
-Subparagraph a, h
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (h)(1)
-URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e1928-114920

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e1928-114920

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Service Cost (Component of Net Periodic Pension Cost)
-URI http://asc.fasb.org/extlink&oid=6525008

+ Details

Fair Value Of Financial Instruments (Fair Value Of Assets And Liabilities Measured On Recurring Basis) (Details) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Millions	Mar. 30, 2012	Dec. 31, 2011
Estimate Of Fair Value, Fair Value Disclosure [Member] \| Demand And Time Deposits [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	$ 431.0	$ 455.3
Estimate Of Fair Value, Fair Value Disclosure [Member] \| Treasuries [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	92.6	131.1
Estimate Of Fair Value, Fair Value Disclosure [Member] \| Commercial Paper [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	54.2	50.9
Estimate Of Fair Value, Fair Value Disclosure [Member] \| Corporate Bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	2.3	15.6
Estimate Of Fair Value, Fair Value Disclosure [Member] \| Foreign Exchange Contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other Current Assets	0.4	0.7
Liabilities	0.2	0.1
Quoted Prices In Active Markets For Identical Assets(Level 1) [Member] \| Demand And Time Deposits [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	431.0	455.3
Quoted Prices In Active Markets For Identical Assets(Level 1) [Member] \| Treasuries [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	92.6	131.1
Quoted Prices In Active Markets For Identical Assets(Level 1) [Member] \| Commercial Paper [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	54.2	50.9
Quoted Prices In Active Markets For Identical Assets(Level 1) [Member] \| Corporate Bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	2.3	15.1
Quoted Prices In Active Markets For Identical Assets(Level 1) [Member] \| Foreign Exchange Contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other Current Assets	0.4	0.7
Liabilities	$ 0.2	$ 0.1

Guarantor And Non-Guarantor Statements (Notes To Consolidated Statement Of Balance Sheet) (Details) - USD ($)
$ in Millions

Mar. 30, 2012

Dec. 31, 2011

Apr. 01, 2011

Dec. 31, 2010

Condensed Financial Statements, Captions [Line Items]

Cash and cash equivalents

$ 580.1

$ 652.9

$ 766.0

$ 623.3

Short-term investments

312.2

248.6

Receivables, net

425.3

457.2

Inventories

633.7

637.4

Other current assets

76.8

121.6

Deferred income taxes, net of allowances

10.3

10.0

Total current assets

2,038.4

2,127.7

Property, plant and equipment, net

1,155.5

1,109.5

Deferred income taxes, net of allowances

30.1

34.2

Goodwill

198.7

Intangible assets, net

325.8

337.2

Investments and other assets

80.7

76.2

Total assets

3,829.2

3,883.5

Accounts payable

408.6

451.8

Accrued expenses

238.5

239.8

Income taxes payable

2.8

7.5

Accrued interest

4.2

0.7

Deferred income on sales to distributors

153.5

172.0

Deferred income taxes, net of allowances

29.6

33.6

Current portion of long-term debt

377.1

370.1

Total current liabilities

1,214.3

1,275.5

Long-term debt

811.9

836.9

Other long-term liabilities

247.4

260.1

Deferred income taxes, net of allowances

21.1

17.5

Total liabilities

2,294.7

2,390.0

Common stock

5.1

5.0

Additional paid-in capital

3,125.6

3,113.5

Accumulated other comprehensive loss

(41.6)

(46.7)

Accumulated deficit

(1,174.1)

(1,202.3)

Less: treasury stock, at cost

(406.6)

(401.3)

Total ON Semiconductor Corporation stockholders' equity

1,508.4

1,468.2

Minority interest in consolidated subsidiaries

26.1

25.3

22.7

22.0

Total equity

1,534.5

1,493.5

Total liabilities and equity

3,829.2

3,883.5

Issuer [Member]

Condensed Financial Statements, Captions [Line Items]

Investments and other assets

^[1]

2,086.9

2,036.2

Total assets

^[1]

2,086.9

2,036.2

Accrued interest

^[1]

3.8

0.6

Current portion of long-term debt

^[1]

186.0

182.6

Total current liabilities

^[1]

189.8

183.2

Long-term debt

^[1]

388.4

384.5

Intercompany

^[1]

0.3

Total liabilities

^[1]

578.5

568.0

Common stock

^[1]

5.1

5.0

Additional paid-in capital

^[1]

3,125.6

3,113.5

Accumulated other comprehensive loss

^[1]

(41.6)

(46.7)

Accumulated deficit

^[1]

(1,174.1)

(1,202.3)

Less: treasury stock, at cost

^[1]

(406.6)

(401.3)

Total ON Semiconductor Corporation stockholders' equity

^[1]

1,508.4

1,468.2

Total equity

^[1]

1,508.4

1,468.2

Total liabilities and equity

^[1]

2,086.9

2,036.2

SCI LLC [Member]

Condensed Financial Statements, Captions [Line Items]

Cash and cash equivalents

232.7

304.5

430.6

392.3

Short-term investments

312.2

248.6

Receivables, net

56.9

64.7

Inventories

35.8

36.2

Other current assets

9.9

7.5

Deferred income taxes, net of allowances

5.5

Total current assets

653.0

667.0

Property, plant and equipment, net

258.3

255.2

Goodwill

125.7

Intangible assets, net

147.8

152.3

Investments and other assets

1,341.2

1,303.5

Total assets

2,526.0

2,503.7

Accounts payable

31.3

32.8

Accrued expenses

56.8

61.0

Income taxes payable

(8.4)

(0.1)

Accrued interest

0.2

Deferred income on sales to distributors

39.7

43.7

Current portion of long-term debt

70.9

74.1

Total current liabilities

190.5

211.5

Long-term debt

375.3

393.8

Other long-term liabilities

25.8

26.6

Deferred income taxes, net of allowances

5.5

Intercompany

(303.2)

(318.2)

Total liabilities

293.9

319.2

Common stock

0.3

Additional paid-in capital

2,716.6

2,711.2

Accumulated other comprehensive loss

(41.6)

(46.7)

Accumulated deficit

(443.2)

(480.3)

Total ON Semiconductor Corporation stockholders' equity

2,232.1

2,184.5

Total equity

2,232.1

2,184.5

Total liabilities and equity

2,526.0

2,503.7

Other Subsidiaries [Member]

Condensed Financial Statements, Captions [Line Items]

Cash and cash equivalents

(0.9)

(0.2)

Total current assets

(0.9)

(0.2)

Property, plant and equipment, net

2.7

2.3

Goodwill

37.3

Investments and other assets

61.0

59.1

Total assets

100.1

98.5

Accounts payable

0.1

Accrued expenses

0.8

Total current liabilities

0.8

0.9

Other long-term liabilities

0.4

Intercompany

(51.5)

(54.5)

Total liabilities

(50.3)

(53.2)

Common stock

50.9

Additional paid-in capital

238.4

Accumulated deficit

(138.9)

(137.6)

Total ON Semiconductor Corporation stockholders' equity

150.4

151.7

Total equity

150.4

151.7

Total liabilities and equity

100.1

98.5

Non-Guarantor Subsidiaries [Member]

Condensed Financial Statements, Captions [Line Items]

Cash and cash equivalents

348.3

348.6

$ 335.6

$ 231.0

Receivables, net

368.4

392.5

Inventories

605.5

599.3

Other current assets

66.9

114.1

Deferred income taxes, net of allowances

4.8

4.5

Total current assets

1,393.9

1,459.0

Property, plant and equipment, net

897.3

854.5

Deferred income taxes, net of allowances

30.1

34.2

Goodwill

35.7

Intangible assets, net

207.1

215.0

Investments and other assets

852.9

846.9

Total assets

3,417.0

3,445.3

Accounts payable

377.3

418.9

Accrued expenses

179.2

176.3

Income taxes payable

11.2

7.6

Accrued interest

0.2

0.1

Deferred income on sales to distributors

113.8

128.3

Deferred income taxes, net of allowances

29.6

33.6

Current portion of long-term debt

120.2

113.4

Total current liabilities

831.5

878.2

Long-term debt

48.2

58.6

Other long-term liabilities

221.2

233.1

Deferred income taxes, net of allowances

15.6

12.0

Intercompany

148.9

166.9

Total liabilities

1,265.4

1,348.8

Common stock

147.2

146.9

Additional paid-in capital

1,359.5

1,359.2

Accumulated other comprehensive loss

(34.5)

(39.2)

Accumulated deficit

679.4

629.6

Total ON Semiconductor Corporation stockholders' equity

2,151.6

2,096.5

Total equity

2,151.6

2,096.5

Total liabilities and equity

3,417.0

3,445.3

Eliminations [Member]

Condensed Financial Statements, Captions [Line Items]

Inventories

(7.6)

1.9

Total current assets

(7.6)

1.9

Property, plant and equipment, net

(2.8)

(2.5)

Intangible assets, net

(29.1)

(30.1)

Investments and other assets

(4,261.3)

(4,169.5)

Total assets

(4,300.8)

(4,200.2)

Accrued expenses

1.7

Total current liabilities

1.7

Intercompany

205.5

Total liabilities

207.2

Common stock

(198.4)

(198.1)

Additional paid-in capital

(4,314.5)

(4,308.8)

Accumulated other comprehensive loss

76.1

85.9

Accumulated deficit

(97.3)

(11.7)

Total ON Semiconductor Corporation stockholders' equity

(4,534.1)

(4,432.7)

Minority interest in consolidated subsidiaries

26.1

25.3

Total equity

(4,508.0)

(4,407.4)

Total liabilities and equity

$ (4,300.8)

$ (4,200.2)

[1]	ON Semiconductor is a holding company and has no operations apart from those of its operating subsidiaries. Additionally, ON Semiconductor does not maintain a bank account; rather SCI LLC, its primary domestic operating subsidiary, processes all of its cash receipts and disbursements on its behalf.

Segment Information

3 Months Ended

Mar. 30, 2012

Segment Information [Abstract]

Segment Information

Note 13: Segment Information

The Company is organized into four operating segments, which also represent four reporting segments: computing and consumer products group, automotive, industrial, medical and mil-aero products group, standard products group and SANYO Semiconductor products group. Each of the Company's major product lines has been examined and each product line has been assigned to a segment, as illustrated in the table below, based on the Company's operating strategy. Because many products are sold into different end-markets, the total revenue reported for a segment is not indicative of actual sales in the end-market associated with that segment, but rather is the sum of the revenue from the product lines assigned to that segment. These segments represent the Company's view of the business and as such are used to evaluate progress of major initiatives.

Revenues, gross profit and operating income for the Company's reportable segments for the quarters ended March 30, 2012 and April 1, 2011, respectively, are as follows (in millions):


	Computing & Consumer Products Group		Automotive, Industrial, Medical and Mil-Aero Products Group		Standard Products Group		SANYO Semiconductor Products Group			Total
For quarter ended March 30, 2012:
Revenues from external customers	$	138.3	$	203.4	$	196.8	$	205.9		$	744.4
Segment gross profit	$	52.5	$	91.3	$	73.5	$	39.9		$	257.2
Segment operating income (loss)	$	20.9	$	19.7	$	46.9	$	(20.4	)	$	67.1
For quarter ended April 1, 2011:
Revenues from external customers	$	155.7	$	208.7	$	228.1	$	278.1		$	870.6
Segment gross profit	$	63.7	$	104.3	$	86.2	$	4.4		$	258.6
Segment operating income (loss)	$	27.4	$	32.5	$	54.6	$	(42.8	)	$	71.7

Depreciation and amortization expense is included in segment operating income. Reconciliations of segment gross profit and segment operating income to the financial statements are as follows (in millions):


	Quarter Ended
	March 30, 2012			April 1, 2011
Gross profit for reportable segments	$	257.2		$	258.6
Unallocated amounts:
Other unallocated manufacturing costs	$	(12.0	)	$	(16.2	)

Gross profit	$	245.2		$	242.4

Operating income for reportable segments	$	67.1		$	71.7
Unallocated amounts:
Restructuring and other charges		(11.5	)		(12.4	)
Other unallocated manufacturing costs		(12.0	)		(16.2	)
Other unallocated operating expenses		—			(10.4	)

Operating income	$	43.6		$	32.7

Revenues by geographic location including local sales and exports made by operations within each area, based on shipments from the respective country, are summarized as follows (in millions):


	Quarter Ended
	March 30, 2012		April 1, 2011
United States	$	111.3	$	127.2
Other Americas		9.4		6.2
United Kingdom		105.8		109.9
Belgium		0.1		0.9
China		218.3		269.9
Japan		115.2		125.4
Singapore		143.5		170.8
Other Asia/Pacific		40.8		60.3

	$	744.4	$	870.6

Property, plant and equipment, net by geographic location, are summarized as follows (in millions):


	March 30, 2012		December 31, 2011
United States	$	261.0	$	257.5
China		94.5		96.7
Other Europe		129.0		117.9
Malaysia		172.6		164.5
Philippines		209.6		204.0
Other Asia/Pacific		82.4		56.2
Japan		125.3		130.2
Belgium		68.4		70.0
Other Americas		12.7		12.5

	$	1,155.5	$	1,109.5

For the quarters ended March 30, 2012, and April 1, 2011, there was no individual customer which accounted for more than 10.0% of the Company's total revenues.

- Definition

The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 131
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 34
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8981-108599

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 35
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8984-108599

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 42
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e9054-108599

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 40
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e9031-108599

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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+ Details

Long-Term Debt (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 30, 2012	Apr. 16, 2012
Debt Instrument [Line Items]
Principal payment	$ 622.2
Zero Coupon Convertible Senior Subordinated Notes Due 2024 [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate	0.00%	0.00%
Debt instrument, maturity year	2024
1.875% Convertible Senior Subordinated Notes Due 2025 [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate	1.875%
Debt instrument, maturity year	2025
2.625% Convertible Senior Subordinated Notes Due 2026 [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate	2.625%
Debt instrument, maturity year	2026
2.625% Convertible Senior Subordinated Notes Due 2026, Series B [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate	2.625%
Debt instrument, maturity year	2026

Share-Based Compensation

3 Months Ended

Mar. 30, 2012

Share-Based Compensation [Abstract]

Share-Based Compensation

Note 8: Share-Based Compensation

Total share-based compensation expense related to the Company's employee stock options, restricted stock units and employee stock purchase plan ("ESPP") for the quarters ended March 30, 2012 and April 1, 2011 were comprised as follows (in millions):


	Quarter Ended
	March 30, 2012		April 1, 2011
Cost of revenues	$	1.4	$	1.9
Research and development		1.6		2.0
Selling and marketing		1.6		1.9
General and administrative		2.8		4.6

Share-based compensation expense before income taxes	$	7.4	$	10.4

Related income tax benefits ⁽¹⁾		—		—

Share-based compensation expense, net of taxes	$	7.4	$	10.4

(1)	Most of the Company's share-based compensation relates to its domestic subsidiaries, which have historically experienced recurring net operating losses; therefore, no related tax benefits are recorded.

At March 30, 2012, total unrecognized estimated share-based compensation expense, net of estimated forfeitures, related to non-vested stock options granted prior to that date was $10.0 million. At March 30, 2012, total unrecognized share-based compensation expense, net of forfeitures, related to non-vested restricted stock units with time-based service conditions and performance-based vesting criteria granted prior to that date was $45.9 million. The total intrinsic value of stock options exercised during the quarter ended March 30, 2012 was $3.4 million. The Company recorded cash received from the exercise of stock options of $4.8 million and no related tax benefits during the quarter ended March 30, 2012.

Share-Based Compensation Information

The fair value of each option grant is estimated on the date of grant using a lattice-based option valuation model. The lattice-based model uses: (1) a constant volatility; (2) an employee exercise behavior model (based on an analysis of historical exercise behavior); and (3) the treasury yield curve to calculate the fair value of each option grant.

The weighted-average estimated fair value of employee stock options granted during the quarters ended March 30, 2012 and April 1, 2011 was $3.41 per share and $4.22 per share, respectively, and was calculated using the lattice-based model with the following weighted-average assumptions (annualized percentages):


	Quarter Ended
	March 30, 2012		April 1, 2011
Volatility		46.7%		41.0%
Risk-free interest rate		0.9%		2.1%
Expected term		4.8 years		4.9 years

Share-based compensation expense recognized in the Consolidated statement of comprehensive income is based on awards ultimately expected to vest. Forfeitures are estimated at the time of grant and revised, if necessary, in subsequent periods if actual forfeitures differ from those estimates. Pre-vesting forfeitures for stock options were estimated to be approximately 11% and 12% in the quarters ended March 30, 2012 and April 1, 2011, respectively. Pre-vesting forfeitures for restricted stock units were estimated to be approximately 4% and 12% in the quarters ended March 30, 2012 and April 1, 2011, respectively.

Shares Available

As of December 31, 2011, there was an aggregate of 17.4 million shares of common stock available for grant under the Company's Amended and Restated Stock Incentive Plan (the "Amended and Restated SIP") and 4.1 million shares available for issuance under the ESPP. As of March 30, 2012, there was an aggregate of 11.5 million shares of common stock available for grant under the Amended and Restated SIP and 4.1 million shares available for issuance under the ESPP.

Stock Options

A summary of stock option transactions follows (in millions except per share and term data):


	Quarter Ended March 30, 2012
	Number of Shares			Weighted-Average Exercise Price		Weighted Average Remaining Contractual Term (in years)		Aggregate Intrinsic Value (In-The-Money)
Outstanding at December 31, 2011		18.7		$	7.70
Granted		1.4			8.40
Exercised		(0.9	)		4.99
Canceled		(0.2	)		7.63

Outstanding at March 30, 2012		19.0		$	7.88		4.6	$	29.8

Exercisable at March 30, 2012		14.8			7.84		4.1	$	25.2

Additional information about stock options outstanding at March 30, 2012 with exercise prices less than or above $9.01 per share, the closing price of the Company's common stock at March 30, 2012, follows (number of shares in millions):


	Exercisable				Unexercisable				Total
Exercise Prices	Number of Shares		Weighted Average Exercise Price		Number of Shares		Weighted Average Exercise Price		Number of Shares		Weighted Average Exercise Price
Less than $9.01		8.5	$	6.04		3.5	$	7.74		12.0	$	6.54
Above $9.01		6.3	$	10.28		0.7	$	9.73		7.0	$	10.22

Total Outstanding		14.8	$	7.84		4.2	$	8.07		19.0	$	7.88

Restricted Stock Units

Restricted stock units vest over one to three years with service-based requirements or performance-based requirements and are payable in shares of the Company's common stock upon vesting. The following table presents a summary of the status of the Company's restricted stock units granted to certain officers and employees of the Company as of March 30, 2012, and changes during the three months ended March 30, 2012 (number of shares in millions):


	Quarter Ended March 30, 2012
	Number of Shares			Weighted-Average Grant Date Fair Value
Nonvested shares of restricted stock units at December 31, 2011		9.6		$	7.95
Granted		3.1			8.40
Released		(2.0	)		5.75
Forfeited		(0.1	)		8.69

Nonvested shares of restricted stock units at March 30, 2012		10.6		$	8.49

- Definition

The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
-Paragraph 64, 65, A240
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Statement of Position (SOP)
-Number 93-6
-Paragraph 53
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 14

Reference 4: http://www.xbrl.org/2003/role/presentationRef
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-Topic 718
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-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6418621&loc=d3e17540-113929

+ Details

Background And Basis Of Presentation (Tables)

3 Months Ended

Mar. 31, 2012

Background And Basis Of Presentation [Abstract]

Schedule Of The Consolidated Statement Of Comprehensive Income Adjustments


	For the Quarter Ended April 1, 2011
	As reported			As revised
Other income (expenses), net:
Other	$	(0.2	)	$	(2.5	)
Gain on SANYO Semiconductor acquisition		61.3			24.3
Net income attributable to ON Semiconductor Corporation	$	74.8		$	35.5

Net income per common share attributable to ON Semiconductor Corporation
Basic	$	0.17		$	0.08

Diluted	$	0.16		$	0.08

- Definition

Tabular disclosure of prior period adjustments to previously issued financial statements including (1) the effect of the correction on each financial statement line item and any per-share amounts affected for each prior period presented (2) the cumulative effect of the change on retained earnings or other appropriate components of equity or net assets in the statement of financial position, as of the beginning of the earliest period presented, and (3) the effect of the prior period adjustments (both gross and net of applicable income tax) on the net income of each prior period presented in the entity's annual report for the year in which the adjustments are made.

+ References + Details

Commitments And Contingencies

3 Months Ended

Mar. 30, 2012

Commitments And Contingencies [Abstract]

Commitments And Contingencies

Note 9: Commitments and Contingencies

Leases

The following is a schedule by year of future minimum lease obligations under non-cancelable operating leases as of March 30, 2012 (in millions):


Remainder of 2012		24.3
2013		20.6
2014		16.8
2015		14.1
2016		12.3
Thereafter		26.6

Total	$	114.7

Other Contingencies

The Company's headquarters in Phoenix, Arizona are located on property that is a "Superfund" site, a property listed on the National Priorities List and subject to clean-up activities under the Comprehensive Environmental Response, Compensation, and Liability Act. Motorola, Inc. ("Motorola"), and now Freescale Semiconductor, Inc. ("Freescale"), have been involved in the cleanup of on-site solvent contaminated soil and groundwater and off-site contaminated groundwater pursuant to consent decrees with the State of Arizona. As part of the Company's August 4, 1999 recapitalization ("Recapitalization"), Motorola retained responsibility for this contamination, and Motorola and Freescale have agreed to indemnify the Company with respect to remediation costs and other costs or liabilities related to this matter.

As part of the Recapitalization, the Company was granted various manufacturing facilities, one of which was located in the Czech Republic. In regards to this site, the Company has ongoing remediation projects to respond to releases of hazardous substances that occurred prior to the Recapitalization during the years that this facility was operated by government-owned entities. In each case, the remediation project consists primarily of monitoring groundwater wells located on-site and off-site with additional action plans developed to respond in the event activity levels are exceeded at each of the respective locations. The government of the Czech Republic has agreed to indemnify the Company and the respective subsidiaries, subject to specified limitations, for remediation costs associated with this historical contamination. Based upon the information available, total future remediation costs to the Company are not expected to be material.

The Company's design center in East Greenwich, Rhode Island is located on property that has localized soil contamination. In connection with the purchase of the facility, the Company entered into a Settlement Agreement and Covenant Not To Sue with the State of Rhode Island. This agreement requires that remedial actions be undertaken and a quarterly groundwater monitoring program be initiated by the former owners of the property. Based on the information available, any costs to the Company in connection with this matter are not expected to be material.

As a result of the acquisition of AMIS, the Company is a "primary responsible party" to an environmental remediation and cleanup at AMIS's former corporate headquarters in Santa Clara, California. Costs incurred by AMIS include implementation of the clean-up plan, operations and maintenance of remediation systems, and other project management costs. However, AMIS's former parent company, a subsidiary of Nippon Mining, contractually agreed to indemnify AMIS and the Company for any obligation relating to environmental remediation and cleanup at this location. The Company has not offset the receivable from Nippon Mining's subsidiary against the estimated liability on the consolidated balance sheet. Therefore, a receivable from Nippon Mining's subsidiary is recorded on the accompanying consolidated balance sheet as of March 30, 2012 related to this matter for approximately $0.1 million. The Company does not believe that the liability and receivable amounts are material to the Company's consolidated financial position, results of operations or cash flow.

The Company's facility in Aizu, Japan is located on property where soil and ground water contamination has been detected. The Company believes that the contamination originally occurred during a time when the facility was operated by a prior owner. The Company is working with local authorities to determine the appropriate remediation actions and expects remediation costs, subject to certain limitations, to be indemnified pursuant to an agreement between the Company and the prior owner or covered by insurance subject to a deductible. Based on information available, any costs to the Company in connection with this matter are not expected to be material.

In the normal course of business, the Company provides standby letters of credit or other guarantee instruments to certain parties initiated by either the Company or its subsidiaries, as required for transactions such as material purchase commitments, agreements to mitigate collection risk, leases or customs guarantees. The Company's senior revolving credit facility includes a $40.0 million availability for the issuance of letters of credit. A $0.2 million letter of credit was outstanding under the senior revolving credit facility as of March 30, 2012. A bank guarantee issued on behalf of the Company under a non-reusable commitment credit with the bank has an outstanding amount of $3.6 million as of March 30, 2012. The Belgian bank that issued the guarantee has the right to create a mortgage on the real property of one of the Company's European subsidiaries in the amount of $3.0 million, but had not done so as of March 30, 2012. The Company also had outstanding guarantees and letters of credit outside of its senior revolving credit facility and its non-reusable commitment credit totaling $10.1 million as of March 30, 2012.

As part of securing financing in the normal course of business, the Company issued guarantees related to its receivables financing, capital lease obligations and real estate mortgages which totaled approximately $110.1 million as of March 30, 2012. The Company is also a guarantor of SCI LLC's unsecured loan with SANYO Electric, which had a balance of $330.3 million as of March 30, 2012. See Note 6: "Long-Term Debt" for further information on this loan.

For its operating leases, the Company expects to make cash payments and similarly incur expenses totaling $114.7 million as payments come due. The Company has not recorded any liability in connection with these operating leases, letters of credit and guarantee arrangements.

Based on historical experience and information currently available, the Company believes that in the foreseeable future it will not be required to make payments under the standby letters of credit or guarantee arrangements.

Indemnification Contingencies

The Company is a party to a variety of agreements entered into in the ordinary course of business pursuant to which it may be obligated to indemnify the other parties for certain liabilities that arise out of or relate to the subject matter of the agreements. Some of the agreements entered into by the Company require it to indemnify the other party against losses due to intellectual property infringement, property damage including environmental contamination, personal injury, failure to comply with applicable laws, the Company's negligence or willful misconduct, or breach of representations and warranties and covenants related to such matters as title to sold assets.

The Company faces risk of exposure to warranty and product liability claims in the event that its products fail to perform as expected or such failure of its products results, or is alleged to result, in bodily injury or property damage (or both). In addition, if any of the Company's designed products are alleged to be defective, the Company may be required to participate in their recall. Depending on the significance of any particular customer and other relevant factors, the Company may agree to provide more favorable indemnity rights to such customer for valid warranty claims.

The Company has, from time to time, been active in merger and acquisition activity. In connection with these mergers or acquisitions, the Company has agreed to indemnify the other party or parties to the merger or acquisition agreement for certain claims or occurrences, limited in most instances by time and/or monetary amounts.

The Company and its subsidiaries provide for indemnification of directors, officers and other persons in accordance with limited liability agreements, certificates of incorporation, by-laws, articles of association or similar organizational documents, as the case may be. The Company maintains directors' and officers' insurance, which should enable it to recover a portion of any future amounts paid.

In addition to the above, from time to time the Company provides standard representations and warranties to counterparties in contracts in connection with sales of its securities and the engagement of financial advisers and also provides indemnities that protect the counterparties to these contracts in the event they suffer damages as a result of a breach of such representations and warranties or in certain other circumstances relating to the sale of securities or their engagement by the Company.

While the Company's future obligations under certain agreements may contain limitations on liability for indemnification, other agreements do not contain such limitations and under such agreements it is not possible to predict the maximum potential amount of future payments due to the conditional nature of the Company's obligations and the unique facts and circumstances involved in each particular agreement. Historically, payments made by the Company under any of these indemnities have not had a material effect on the Company's business, financial condition, results of operations or cash flows. Additionally, the Company does not believe that any amounts that it may be required to pay under these indemnities in the future will be material to the Company's business, financial position, results of operations or cash flows.

Legal Matters

The Company is currently involved in a variety of legal matters that arise in the normal course of business. Based on information currently available, management does not believe that the ultimate resolution of these matters, including the matters described or referred to in the next paragraphs will have a material effect on the Company's financial condition, results of operations or cash flows. However, because of the nature and inherent uncertainties of litigation, should the outcome of these actions be unfavorable, the Company's business, consolidated financial position, results of operations or cash flows could be materially and adversely affected.

On December 15, 2010, a lawsuit was filed in the United States District Court for the District of Delaware (the "Court") captioned Robert A. Lorber v. Francis P. Barton, George H. Cave, Donald A. Colvin, Curtis J. Crawford, Ph.D., Emmanuel T. Hernandez, Phillip D. Hester, Keith D. Jackson, J. Daniel McCranie, Robert Mahoney, W. John Nelson, Daryl Ostrander, Robert H. Smith, and ON Semiconductor Corporation, C.A. No. 1:10-CV-01101-GMS. The lawsuit was brought by a stockholder of ON Semiconductor and alleges generally that (1) ON Semiconductor's 2010 proxy statement contained materially false and misleading information regarding the Amended and Restated SIP in violation of the federal securities laws; (2) the Amended and Restated SIP was defective and, thus, any awards made pursuant to the Amended and Restated SIP would not be tax-deductible pursuant to Section 162(m) of the Internal Revenue Code and applicable regulations; and (3) the individual defendants (who are ON Semiconductor officers and directors) violated their state law fiduciary duties and wasted corporate assets in connection with the adoption of the Amended and Restated SIP. The Company moved to dismiss the lawsuit. On March 2, 2012, the parties entered into a stipulation of settlement (the "Settlement Stipulation") that sets forth the terms of a settlement which, if approved by the Court, will result in the dismissal of this action. In the Settlement Stipulation, the Company and the other individual defendants have denied and continue to deny that they committed any of the wrongful acts alleged in this lawsuit, and maintain that they have diligently, scrupulously, and meticulously complied with their fiduciary and other legal duties. On March 2, 2012, the parties submitted for the Court's approval the Settlement Stipulation and other papers needed to effect a resolution of this lawsuit. While the Company makes no assurances or guarantees as to the outcome of this proceeding, based upon our current knowledge, the Company believes that the final result of this action will have no material effect on our consolidated financial position, results of operations, or cash flows.

In the normal course of business, the Company faces risk of exposure to warranty and product liability claims. Related to this, the Company (through its subsidiary SANYO Semiconductor) has received a request from one of its customers to pay to the customer an amount currently estimated by the customer to be approximately $20.0 million in respect of costs incurred or to be incurred by the customer and its customers in remedying certain alleged failures of SANYO Semiconductor products sold to the customer prior to the Company's acquisition of SANYO Semiconductor. The Company is conducting investigations and evaluations of this matter, including fact finding and assessing possible liability, available defenses, mitigating circumstances and possible third party indemnity coverage. It is difficult to predict with certainty the ultimate loss exposure to ON Semiconductor; however, management believes that a number of defenses are available to the Company and it would expect to defend itself vigorously against any formal claim that may be asserted. While the Company makes no assurances or guarantees as to the outcome of this claim, based upon its current knowledge, the Company believes that the final result of this matter will have no material effect on its consolidated financial position, results of operations, or cash flows.

On December 27, 2011, 112 former employees of the Company's subsidiary SANYO Semiconductor Thailand ("SSTH"), whose manufacturing operations were located in the Rojana Industrial Park in Ayutthaya, Thailand ("Rojana Park"), filed complaints with the Labor Region 1 Court in Lopburi Province in Thailand, seeking damages against SSTH for unfair termination under Thailand's labor laws. On January 19, 2012, four additional former employees filed similar complaints with the Labor Region 1 Court in Lopburi Province in Thailand against SSTH. On March 19, 2012, 46 additional former employees filed similar complaints with the Labor Region 1 Court in Lopburi Province in Thailand against SSTH. All the cases are based on the widespread flooding in Thailand that occurred in the fourth quarter of 2011 and affected the Rojana Park. The floods severely damaged SSTH's buildings, equipment and other property at its Rojana Park location. As a result, the Company decided to cease SSTH's operations in Thailand and SSTH asked its employees to resign. The lawsuits seek a total of approximately $25.4 million, which includes alleged damages for: (1) wages calculated based on the employee's last wage rate from the date of termination through the date of retirement; (2) mental anguish; (3) lost bonuses; and/or (4) other damages. The Company is currently evaluating the facts and legal issues and it is difficult at this time to predict with certainty the ultimate loss exposure to ON Semiconductor for this matter. The Company denies the substantive allegations of the lawsuits and expects to vigorously defend against them.

See Part I, Item 1 "Business-Government Regulation" of the 2011 Form 10-K for information on certain environmental matters.

- Definition

The entire disclosure for commitments and contingencies.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Interpretation (FIN)
-Number 14
-Paragraph 3
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 5
-Paragraph 9, 10, 11, 12
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
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-Topic 825
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-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6449706&loc=d3e16207-108621

+ Details

Share-Based Compensation (Summary Of Share-Based Compensation Expense) (Details) - USD ($)
$ in Millions

3 Months Ended

Mar. 30, 2012

Apr. 01, 2011

Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]

Share-based compensation expenses

$ 7.4

$ 10.4

Related income tax benefits

^[1]

Share-based compensation expense, net of taxes

7.4

10.4

Cost Of Revenues [Member]

Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]

Share-based compensation expenses

1.4

1.9

Research And Development [Member]

Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]

Share-based compensation expenses

1.6

2.0

Selling And Marketing [Member]

Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]

Share-based compensation expenses

1.6

1.9

General And Administrative [Member]

Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]

Share-based compensation expenses

$ 2.8

$ 4.6

[1]	Most of the Company's share-based compensation relates to its domestic subsidiaries, which have historically experienced recurring net operating losses; therefore, no related tax benefits are recorded.

- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References + Details

Goodwill And Intangible Assets (Summary Of Amortization Expense) (Details) $ in Millions	3 Months Ended
	Mar. 30, 2012 USD ($)
Goodwill And Intangible Assets [Abstract]
Remainder of 2012	$ 33.3
2013	39.7
2014	38.5
2015	37.4
2016	34.4
Thereafter	142.5
Total estimated amortization expense	$ 325.8

Background And Basis Of Presentation (Narrative) (Details) $ in Millions	3 Months Ended
	Apr. 01, 2011 USD ($)
Gain on SANYO Semiconductor acquisition	$ 24.3
As Revised [Member]
Gain on SANYO Semiconductor acquisition	24.3
As Reported [Member]
Gain on SANYO Semiconductor acquisition	$ 61.3

Restructuring, Asset Impairments And Other, Net (Reconciliation Of "Restructuring, Asset Impairments And Other, Net" Caption On The Consolidated Statement Of Operations) (Details) $ in Millions	3 Months Ended
	Mar. 30, 2012 USD ($)
Restructuring Cost and Reserve [Line Items]
Restructuring	$ 7.3
Other	4.2
Total	11.5
Restructuring Activities Related To 2011 Thailand Closure [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring	1.5
Other	1.8
Total	3.3
Restructuring Activities Related To 2011 Aizu Closure [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring	5.8
Other	0.1
Total	5.9
Restructuring Activities Related To The 2011 SANYO Semiconductor Acquisition [Member]
Restructuring Cost and Reserve [Line Items]
Other	2.3
Total	$ 2.3

- Definition

The charge against earnings in the period, comprised of costs associated with restructuring activities not otherwise specified in the taxonomy pursuant to a duly authorized plan, excluding a discontinued operation as defined by generally accepted accounting principles. Costs of such activities include those for one-time termination benefits, termination of an operating lease or other contract, consolidating or closing facilities, and relocating employees, but excludes costs associated with the retirement of a long-lived asset and severance costs associated with established compensation plans.

+ References + Details

Document And Entity Information - shares	3 Months Ended
Document And Entity Information - shares	Mar. 30, 2012	Apr. 26, 2012
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 30, 2012
Document Fiscal Year Focus	2012
Document Fiscal Period Focus	Q1
Entity Registrant Name	ON SEMICONDUCTOR CORP
Entity Central Index Key	0001097864
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		454,082,151

Supplemental Disclosures Of Cash Flow Information (Tables)

3 Months Ended

Mar. 30, 2012

Supplemental Disclosure Of Cash Flow Information [Abstract]

Non-Cash Financing Activities And Cash Payments


	For Quarters Ended
	March 30, 2012			April 1, 2011
Non-cash financing activities:
Capital expenditures in accounts payable	$	105.0		$	55.1
Equipment acquired or refinanced through capital leases	$	—		$	8.3
Cash (received) paid for:
Interest income	$	(0.5	)	$	(0.3	)
Interest expense	$	8.5		$	9.1
Income taxes	$	4.6		$	2.1

Subsequent Events	3 Months Ended
Subsequent Events	Mar. 30, 2012
Subsequent Events [Abstract]
Subsequent Events	Note 15: Subsequent Events Retirement of the Zero Coupon Convertible Senior Subordinated Notes due 2024 On April 16, 2012, the Company exercised its call option relating to its Zero Coupon Convertible Senior Subordinated Notes due 2024. As a result, the Company paid the gross principal amount of approximately $96.2 million to the holders of the notes and retired the outstanding obligation. Voluntary Retirement Program at SANYO Semiconductor Subsidiaries On April 13, 2012 the Company initiated a voluntary retirement program for employees of certain of its SANYO Semiconductor subsidiaries. Under the program, the Company intends to reduce the employment levels at these subsidiaries by up to approximately 500 employees. The ultimate cost of the program will depend on several factors, including the years of service and salary levels of employees that apply for early retirement under the program. Given the voluntary nature of the program, the costs associated with the program will be recorded when the retirement offer is accepted by the impacted employees. The Company estimates recording a charge ranging from $40.0 million to $50.0 million related to this program during the second quarter of 2012. This estimated charge excludes amounts related to the pension benefit impact that may be recognized subsequent to the employees' retirement. The Company's pension and related benefit plans allow for benefit payment elections by the employee and the Company's pension liability balances reflect actuarial assumptions related to these elections. As these employees make their actual elections at retirement, the pension obligation will be determined and as a result the Company will record an adjustment to the pension liability to reflect the impact of employee elections as compared to the actuarial assumptions. Accordingly, the Company cannot reasonably estimate the related impact until the employee elections are known.

Consolidated Balance Sheet (Parenthetical) - $ / shares	Mar. 30, 2012	Dec. 31, 2011
Stockholders' Equity:
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	750,000,000	750,000,000
Common stock, shares issued	505,423,125	502,452,084
Common stock, shares outstanding	453,664,087	451,284,220
Treasury stock, shares	51,759,038	51,167,864

Goodwill And Intangible Assets

3 Months Ended

Mar. 30, 2012

Goodwill And Intangible Assets [Abstract]

Goodwill And Intangible Assets

Note 2: Goodwill and Intangible Assets

Goodwill

The following table summarizes the original goodwill by relevant operating segment as of March 30, 2012 and December 31, 2011 (in millions):


	Balance as of March 30, 2012										Balance as of December 31, 2011
	Original Goodwill		Accumulated Amortization			Accumulated Impairment Losses			Carrying Value		Original Goodwill		Accumulated Amortization			Accumulated Impairment Losses			Carrying Value
Operating Segment:
Automotive, Industrial, Medical and Mil-Aero	$	556.6	$	(4.2	)	$	(406.0	)	$	146.4		556.6		(4.2	)		(406.0	)		146.4
Computing & Consumer Products		29.1		(5.6	)		—			23.5		29.1		(5.6	)		—			23.5
Standard Products		37.7		—			(8.9	)		28.8		37.7		—			(8.9	)		28.8

	$	623.4	$	(9.8	)	$	(414.9	)	$	198.7	$	623.4	$	(9.8	)	$	(414.9	)		198.7

Goodwill is tested for impairment annually on the first day of the fourth quarter unless a triggering event would require an expedited analysis. Adverse changes in operating results and/or unfavorable changes in economic factors used to estimate fair values could result in a non-cash impairment charge in the future. As of March 30, 2012, there were no triggering events which would require the Company to perform an impairment analysis.

Intangible Assets

Intangible assets, net were as follows as of March 30, 2012 and December 31, 2011 (in millions):


	March 30, 2012
	Original Cost		Accumulated Amortization			Foreign Currency Translation Adjustment			Impairment			Carrying Value		Useful Life (in Years)
Intellectual property	$	13.9	$	(8.2	)	$	—		$	—		$	5.7		5-12
Customer relationships		280.3		(77.0	)		(26.8	)		(3.2	)		173.3		5-18
Patents		43.7		(12.0	)		—			—			31.7		12
Developed technology		146.2		(39.2	)		—			(2.0	)		105.0		5-12
Trademarks		14.0		(3.9	)		—			—			10.1		15
In-process research and development		2.5		—			—			(2.5	)		—

Total intangibles	$	500.6	$	(140.3	)	$	(26.8	)	$	(7.7	)	$	325.8


	December 31, 2011
	Original Cost		Accumulated Amortization			Foreign Currency Translation Adjustment			Impairment			Carrying Value		Useful Life (in Years)
Intellectual property	$	13.9	$	(8.0	)	$	—		$	—		$	5.9		5-12
Customer relationships		280.3		(71.9	)		(26.5	)		(3.2	)		178.7		5-18
Patents		43.7		(10.4	)		—			—			33.3		12
Developed technology		145.6		(35.5	)		—			(2.0	)		108.1		5-12
Trademarks		14.0		(3.4	)		—						10.6		15
In-process research and development		3.1		—			—			(2.5	)		0.6

Total intangibles		500.6		(129.2	)		(26.5	)		(7.7	)		337.2

Amortization expense for intangible assets amounted to $11.1 million for the quarter ended March 30, 2012, none of which was included in cost of revenues; and was $10.3 million for the quarter ended April 1, 2011, of which $0.6 million was included in cost of revenues. The Company is currently amortizing fourteen projects totaling $33.4 million through developed technology relating to projects that were originally classified as in-process research and development at the time of acquisition, but which now have been completed and are being amortized over a weighted average useful life of 8.5 years. Amortization expense for intangible assets, is expected to be as follows over the next five years, and thereafter (in millions):


	Total
Remainder of 2012	$	33.3
2013		39.7
2014		38.5
2015		37.4
2016		34.4
Thereafter		142.5

Total estimated amortization expense	$	325.8

- Definition

The entire disclosure for the aggregate amount of goodwill and a description of intangible assets, which may include (a) for amortizable intangible assets (also referred to as finite-lived intangible assets), the carrying amount, the amount of any significant residual value, and the weighted-average amortization period, (b) for intangible assets not subject to amortization (also referred to as indefinite-lived intangible assets), the carrying amount, and (c) the amount of research and development assets acquired and written off in the period, including the line item in the income statement in which the amounts written off are aggregated, if not readily apparent from the income statement. Also discloses (a) for amortizable intangibles assets in total and by major class, the gross carrying amount and accumulated amortization, the total amortization expense for the period, and the estimated aggregate amortization expense for each of the five succeeding fiscal years, (b) for intangible assets not subject to amortization the carrying amount in total and by major class, and (c) for goodwill, in total and for each reportable segment, the changes in the carrying amount of goodwill during the period (including the aggregate amount of goodwill acquired, the aggregate amount of impairment losses recognized, and the amount of goodwill included in the gain (loss) on disposal of a reporting unit). If any part of goodwill has not been allocated to a reportable segment, discloses the unallocated amount and the reasons for not allocating. For each impairment loss recognized related to an intangible asset (excluding goodwill), discloses: (a) a description of the impaired intangible asset and the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method for determining fair value, (c) the caption in the income statement or the statement of activities in which the impairment loss is aggregated, and (d) the segment in which the impaired intangible asset is reported. For each goodwill impairment loss recognized, discloses: (a) a description of the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method of determining the fair value of the associated reporting unit, and (c) if a recognized impairment loss is an estimate not finalized and the reasons why the estimate is not final. May also disclose the nature and amount of any significant adjustments made to a previous estimate of an impairment loss.

+ References + Details

Goodwill And Intangible Assets (Summary Of Intangible Assets, Net) (Details) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 30, 2012 USD ($) yr	Dec. 31, 2011 USD ($) yr
Finite-Lived Intangible Assets [Line Items]
Original Cost	$ 500.6	$ 500.6
Accumulated Amortization	(140.3)	(129.2)
Foreign Currency Translation Adjustment	(26.8)	(26.5)
Impairment	(7.7)	(7.7)
Carrying Value	325.8	337.2
Intellectual Property [Member]
Finite-Lived Intangible Assets [Line Items]
Original Cost	13.9	13.9
Accumulated Amortization	(8.2)	(8.0)
Carrying Value	$ 5.7	$ 5.9
Useful life, minimum (in years) \| yr	5	5
Useful Life, Maximum (in Years) \| yr	12	12
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Original Cost	$ 280.3	$ 280.3
Accumulated Amortization	(77.0)	(71.9)
Foreign Currency Translation Adjustment	(26.8)	(26.5)
Impairment	(3.2)	(3.2)
Carrying Value	$ 173.3	$ 178.7
Useful life, minimum (in years) \| yr	5	5
Useful Life, Maximum (in Years) \| yr	18	18
Patents [Member]
Finite-Lived Intangible Assets [Line Items]
Original Cost	$ 43.7	$ 43.7
Accumulated Amortization	(12.0)	(10.4)
Carrying Value	$ 31.7	$ 33.3
Useful Life (in Years) \| yr	12	12
Developed Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Original Cost	$ 146.2	$ 145.6
Accumulated Amortization	(39.2)	(35.5)
Impairment	(2.0)	(2.0)
Carrying Value	$ 105.0	$ 108.1
Useful life, minimum (in years) \| yr	5	5
Useful Life, Maximum (in Years) \| yr	12	12
Trademarks [Member]
Finite-Lived Intangible Assets [Line Items]
Original Cost	$ 14.0	$ 14.0
Accumulated Amortization	(3.9)	(3.4)
Carrying Value	$ 10.1	$ 10.6
Useful Life (in Years) \| yr	15	15
In-Process Research And Development [Member]
Finite-Lived Intangible Assets [Line Items]
Original Cost	$ 2.5	$ 3.1
Impairment	$ (2.5)	(2.5)
Carrying Value		$ 0.6

Long-Term Debt (Tables)

3 Months Ended

Mar. 30, 2012

Long-Term Debt [Abstract]

Long-Term Debt


	March 30, 2012			December 31, 2011
Senior Revolving Credit Facility (up to $325.0 million)	$	—		$	—
Loan with a Japanese company due 2012 through 2018, interest payable quarterly at 2.22% and 2.33%, respectively (1)		330.3			339.8
Zero Coupon Convertible Senior Subordinated Notes due 2024 (net of discount of $0.3 million and $2.0 million, respectively) (2)		95.9			94.2
1.875% Convertible Senior Subordinated Notes due 2025 (net of discount of $4.9 million and $6.6 million, respectively) (3)		90.1			88.4
2.625% Convertible Senior Subordinated Notes due 2026 (net of discount of $21.6 million and $24.5 million, respectively) (4)		210.8			207.9
2.625% Convertible Senior Subordinated Notes due 2026, Series B (net of discount of $21.1 million and $22.0 million, respectively) (5)		177.5			176.6
Loan with Hong Kong bank, interest payable weekly at 1.99% and 2.04%, respectively		40.0			40.0
Loans with Philippine banks due 2012 through 2015, interest payable monthly and quarterly at an average rate of 2.01% and 2.01%, respectively		65.5			68.2
Loans with Chinese bank due 2013, interest payable quarterly at 4.33% and 4.44%, respectively		7.0			7.0
Loans with Japanese banks due through 2013, interest payable monthly and semi-annually at an average rate of 1.72% and 1.71%, respectively		3.1			3.5
Loan with Singapore bank, interest payable weekly at 1.97% and 1.97%, respectively		27.0			25.0
Loan with British finance company, interest payable monthly at 1.95% and 2.42%, respectively		10.9			13.1
U.S. real estate mortgages payable monthly through 2016 at an average rate of 4.857%		31.2			31.6
U.S. equipment financing payable monthly through 2015 at 3.23%		10.1			10.8
Capital lease obligations		89.6			100.9

Long-term debt, including current maturities		1,189.0			1,207.0
Less: Current maturities		(377.1	)		(370.1	)

Long-term debt	$	811.9		$	836.9

(1)	This loan represents Semiconductor Component Industries, LLC ("SCI LLC") unsecured loan with SANYO Electric, which is guaranteed by the Company.

(2)

The Zero Coupon Convertible Senior Subordinated Notes due 2024 may be put back to the Company at the option of the holders of the notes on April 15 of 2012, 2014 and 2019 or called at the option of the Company on or after April 15, 2012. See Note 15: "Subsequent Events" of this Form 10-Q for the discussion of the retirement of the Zero Coupon Convertible Senior Subordinated Notes due 2024.

(3)	The 1.875% Convertible Senior Subordinated Notes due 2025 may be put back to the Company at the option of the holders of the notes on December 15 of 2012, 2015 and 2020 or called at the option of the Company on or after December 20, 2012.

(4)	The 2.625% Convertible Senior Subordinated Notes due 2026 may be put back to the Company at the option of the holders of the notes on December 15 of 2013, 2016 and 2021 or called at the option of the Company on or after December 20, 2013.

(5)	The 2.625% Convertible Senior Subordinated Notes due 2026, Series B may be put back to the Company at the option of the holders of the notes on December 15 of 2016 and 2021 or called at the option of the Company on or after December 20, 2016.

Annual Maturities Relating To Long-Term Debt


	Expected Maturities
Remainder of 2012		353.7
2013		328.6
2014		75.3
2015		63.5
2016		262.2
Thereafter		153.6

Total	$	1,236.9

- Definition

Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 22
-Article 5

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 835
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-Name Accounting Standards Codification
-Topic 835
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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-Subparagraph (SX 210.5-02.22)
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-Publisher FASB
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-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21538-112644

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-Topic 942
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-URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823

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-Name Accounting Standards Codification
-Topic 235
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-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(e),(f))
-URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690

+ Details

Guarantor and Non-Guarantor Statements (Tables)

3 Months Ended

Mar. 30, 2012

Guarantor And Non-Guarantor Statements [Abstract]

Notes To Consolidated Statement Of Balance Sheet


	Issuer			Guarantor
	ON Semiconductor Corporation ⁽¹⁾			SCI LLC			Other Subsidiaries			Non-Guarantor Subsidiaries			Eliminations			Total
As of March 30, 2012
Cash and cash equivalents	$	—		$	232.7		$	(0.9	)	$	348.3		$	—		$	580.1
Short-term investments		—			312.2			—			—			—			312.2
Receivables, net		—			56.9			—			368.4			—			425.3
Inventories		—			35.8			—			605.5			(7.6	)		633.7
Other current assets		—			9.9			—			66.9			—			76.8
Deferred income taxes, net of allowances		—			5.5			—			4.8			—			10.3

Total current assets		—			653.0			(0.9	)		1,393.9			(7.6	)		2,038.4
Property, plant and equipment, net		—			258.3			2.7			897.3			(2.8	)		1,155.5
Deferred income taxes, net of allowances		—			—			—			30.1			—			30.1
Goodwill		—			125.7			37.3			35.7			—			198.7
Intangible assets, net		—			147.8			—			207.1			(29.1	)		325.8
Investments and other assets		2,086.9			1,341.2			61.0			852.9			(4,261.3	)		80.7

Total assets	$	2,086.9		$	2,526.0		$	100.1		$	3,417.0		$	(4,300.8	)	$	3,829.2

Accounts payable	$	—		$	31.3		$	—		$	377.3		$	—		$	408.6
Accrued expenses		—			56.8			0.8			179.2			1.7			238.5
Income taxes payable		—			(8.4	)		—			11.2			—			2.8
Accrued interest		3.8			0.2			—			0.2			—			4.2
Deferred income on sales to distributors		—			39.7			—			113.8			—			153.5
Deferred income taxes, net of allowances		—			—			—			29.6			—			29.6
Current portion of long-term debt		186.0			70.9			—			120.2			—			377.1

Total current liabilities		189.8			190.5			0.8			831.5			1.7			1,214.3
Long-term debt		388.4			375.3			—			48.2			—			811.9
Other long-term liabilities		—			25.8			0.4			221.2			—			247.4
Deferred income taxes, net of allowances		—			5.5			—			15.6			—			21.1
Intercompany		0.3			(303.2	)		(51.5	)		148.9			205.5			—

Total liabilities		578.5			293.9			(50.3	)		1,265.4			207.2			2,294.7
Common stock		5.1			0.3			50.9			147.2			(198.4	)		5.1
Additional paid-in capital		3,125.6			2,716.6			238.4			1,359.5			(4,314.5	)		3,125.6
Accumulated other comprehensive loss		(41.6	)		(41.6	)		—			(34.5	)		76.1			(41.6	)
Accumulated deficit		(1,174.1	)		(443.2	)		(138.9	)		679.4			(97.3	)		(1,174.1	)
Less: treasury stock, at cost		(406.6	)		—			—			—			—			(406.6	)

Total ON Semiconductor Corporation stockholders' equity (deficit)		1,508.4			2,232.1			150.4			2,151.6			(4,534.1	)		1,508.4
Minority interests in consolidated subsidiaries		—			—			—			—			26.1			26.1

Total equity		1,508.4			2,232.1			150.4			2,151.6			(4,508.0	)		1,534.5

Total liabilities and equity	$	2,086.9		$	2,526.0		$	100.1		$	3,417.0		$	(4,300.8	)	$	3,829.2


	Issuer			Guarantor
	ON Semiconductor Corporation ⁽¹⁾			SCI LLC			Other Subsidiaries			Non-Guarantor Subsidiaries			Eliminations			Total
As of December 31, 2011
Cash and cash equivalents	$	—			304.5			(0.2	)	$	348.6			—		$	652.9
Short-term investments		—			248.6			—			—			—			248.6
Receivables, net		—			64.7			—			392.5			—			457.2
Inventories		—			36.2			—			599.3			1.9			637.4
Other current assets		—			7.5			—			114.1			—			121.6
Deferred income taxes, net of allowances		—			5.5			—			4.5			—			10.0

Total current assets		—			667.0			(0.2	)		1,459.0			1.9			2,127.7
Property, plant and equipment, net		—			255.2			2.3			854.5			(2.5	)		1,109.5
Deferred income taxes, net of allowances		—			—			—			34.2			—			34.2
Goodwill		—			125.7			37.3			35.7			—			198.7
Intangible assets, net		—			152.3						215.0			(30.1	)		337.2
Investments and other assets		2,036.2			1,303.5			59.1			846.9			(4,169.5	)		76.2

Total assets	$	2,036.2		$	2,503.7		$	98.5		$	3,445.3		$	(4,200.2	)	$	3,883.5

Accounts payable	$	—		$	32.8			0.1			418.9			—		$	451.8
Accrued expenses		—			61.0			0.8			176.3			1.7			239.8
Income taxes payable		—			(0.1	)		—			7.6			—			7.5
Accrued interest		0.6			—			—			0.1			—			0.7
Deferred income on sales to distributors		—			43.7			—			128.3			—			172.0
Deferred income taxes, net of allowances		—			—			—			33.6			—			33.6
Current portion of long-term debt		182.6			74.1			—			113.4			—			370.1

Total current liabilities		183.2			211.5			0.9			878.2			1.7			1,275.5
Long-term debt		384.5			393.8			—			58.6			—			836.9
Other long-term liabilities		—			26.6			0.4			233.1			—			260.1
Deferred income tax, net of allowances		—			5.5			—			12.0			—			17.5
Intercompany		0.3			(318.2	)		(54.5	)		166.9			205.5			—

Total liabilities		568.0			319.2			(53.2	)		1,348.8			207.2			2,390.0
Common stock		5.0			0.3			50.9			146.9			(198.1	)		5.0
Additional paid-in capital		3,113.5			2,711.2			238.4			1,359.2			(4,308.8	)		3,113.5
Accumulated other comprehensive loss		(46.7	)		(46.7	)		—			(39.2	)		85.9			(46.7	)
Accumulated deficit		(1,202.3	)		(480.3	)		(137.6	)		629.6			(11.7	)		(1,202.3	)
Less: treasury stock, at cost		(401.3	)		—			—			—			—			(401.3	)

Total ON Semiconductor Corporation stockholders' equity (deficit)		1,468.2			2,184.5			151.7			2,096.5			(4,432.7	)		1,468.2
Minority interests in consolidated subsidiaries		—			—			—			—			25.3			25.3

Total equity		1,468.2			2,184.5			151.7			2,096.5			(4,407.4	)		1,493.5

Total liabilities and equity	$	2,036.2		$	2,503.7		$	98.5		$	3,445.3		$	(4,200.2	)	$	3,883.5

Notes To Consolidated Statement Of Operations And Cash Flow


	Issuer			Guarantor Subsidiaries
	ON Semiconductor Corporation ⁽¹⁾			SCI LLC			Other Subsidiaries			Non-Guarantor Subsidiaries			Eliminations			Total
For the quarter ended March 30, 2012
Revenues	$	—		$	185.6		$	—		$	893.5		$	(334.7	)	$	744.4
Cost of product revenues		—			116.1			0.2			708.1			(325.2	)		499.2

Gross profit		—			69.5			(0.2	)		185.4			(9.5	)		245.2

Research and development		—			43.2			2.6			45.6			—			91.4
Selling and marketing		—			17.1			0.2			28.3			—			45.6
General and administrative		—			15.2			0.2			26.6			—			42.0
Amortization of acquisition related intangible assets		—			4.5			—			7.6			(1.0	)		11.1
Restructuring, asset impairments and other, net		—			—			—			11.5			—			11.5

Total operating expenses		—			80.0			3.0			119.6			(1.0	)		201.6

Operating income (loss)		—			(10.5	)		(3.2	)		65.8			(8.5	)		43.6
Interest expense		(10.9	)		(2.3	)		—			(2.5	)		—			(15.7	)
Interest income		—			0.3			—			0.2			—			0.5
Other		—			6.2			—			(1.5	)		—			4.7
Equity in earnings		39.1			34.9			1.9			—			(75.9	)		—

Income (loss) before income taxes		28.2			28.6			(1.3	)		62.0			(84.4	)		33.1
Income tax provision		—			8.5			—			(12.6	)		—			(4.1	)

Net income (loss)		28.2			37.1			(1.3	)		49.4			(84.4	)		29.0
Net income attributable to minority interest		—			—			—			—			(0.8	)		(0.8	)

Net income (loss) attributable to ON Semiconductor Corporation	$	28.2		$	37.1		$	(1.3	)	$	49.4		$	(85.2	)	$	28.2

Comprehensive income:
Net income	$	28.2		$	37.1		$	(1.3	)	$	49.4		$	(84.4	)	$	29.0
Foreign currency translation adjustments		4.9			0.8			—			4.1			(4.9	)		4.9
Effects of cash flow hedges		(0.4	)		(0.4	)		—			—			0.4			(0.4	)
Unrealized gain on available-for-sale securities		0.5			—			—			0.5			(0.5	)		0.5
Amortization of prior service costs of defined benefit plan		0.1			—			—			0.1			(0.1	)		0.1

Comprehensive income		33.3			37.5			(1.3	)		54.1			(89.5	)		34.1
Comprehensive income attributable to minority interest		—			—			—			—			(0.8	)	$	(0.8	)

Comprehensive income attributable to ON Semiconductor Corporation:	$	33.3		$	37.5		$	(1.3	)	$	54.1		$	(90.3	)	$	33.3

Net cash (used in) provided by operating activities	$	—		$	(31.3	)	$	(0.2	)	$	99.9		$	—		$	68.4

Cash flows from investing activities:
Purchases of property, plant and equipment		—			(11.2	)		(0.5	)		(38.7	)		—			(50.4	)
Proceeds from sales of property, plant and equipment		—			—			—			1.9			—			1.9
Deposits utilized for purchases of property, plant and equipment		—			—			—			(9.6	)		—			(9.6	)
Recovery from insurance on property, plant and equipment		—			—			—			11.5			—			11.5
Proceeds from held-to-maturity securities		—			99.7			—			—			—			99.7
Purchase of held-to-maturity securities		—			(163.3	)		—			—			—			(163.3	)

Net cash used in investing activities		—			(74.8	)		(0.5	)		(34.9	)		—			(110.2	)

Cash flows from financing activities:
Intercompany loans		—			(23.3	)		—			23.3			—			—
Intercompany loan repayments		—			70.2			—			(70.2	)		—			—
Proceeds from debt issuance		—			—			—			2.0			—			2.0
Proceeds from exercise of stock options		—			4.8			—			—						4.8
Payment of capital lease obligation		—			(11.0	)		—			(0.4	)					(11.4	)
Purchase of treasury stock		—			(5.3	)		—			—			—			(5.3	)
Repayment of long term debt		—			(1.1	)		—			(14.5	)		—			(15.6	)

Net cash provided by (used in) financing activities		—			34.3			—			(59.8	)		—			(25.5	)

Effect of exchange rate changes on cash and cash equivalents											(5.5	)					(5.5	)

Net increase (decrease) in cash and cash equivalents		—			(71.8	)		(0.7	)		(0.3	)		—			(72.8	)
Cash and cash equivalents, beginning of period		—			304.5			(0.2	)		348.6						652.9

Cash and cash equivalents, end of period	$	—		$	232.7		$	(0.9	)	$	348.3		$	—		$	580.1


	Issuers			Guarantor Subsidiaries
	ON Semiconductor Corporation ⁽¹⁾			SCI LLC			Other Subsidiaries			Non-Guarantor Subsidiaries			Eliminations			Total
For the quarter ended April 1, 2011
Revenues	$	—		$	208.6		$	—		$	1,003.1		$	(341.1	)	$	870.6
Cost of product revenues		—			154.9			0.3			805.9			(332.9	)		628.2

Gross profit		—			53.7			(0.3	)		197.2			(8.2	)		242.4

Research and development		—			59.3			3.0			28.8			—			91.1
Selling and marketing		—			21.4			0.3			27.7			—			49.4
General and administrative		—			27.4			0.2			19.5			—			47.1
Amortization of acquisition related intangible assets		—			4.4			—			6.3			(1.0	)		9.7
Restructuring, asset impairments and other, net		—			—			—			12.4			—			12.4

Total operating expenses		—			112.5			3.5			94.7			(1.0	)		209.7

Operating income (loss)		—			(58.8	)		(3.8	)		102.5			(7.2	)		32.7
Interest expense		(12.9	)		(2.2	)		—			(2.7	)		—			(17.8	)
Interest income		—			0.1			—			0.2			—			0.3
Other		—			4.1			—			(6.6	)		—			(2.5	)
Gain (loss) on SANYO Semiconductor acquisition		—			24.3			—			—			—			24.3
Loss on debt repurchase		—			—			—			—			—			—
Equity in earnings		48.4			42.6			1.7			—			(92.7	)		—

Income (loss) before income taxes		35.5			10.1			(2.1	)		93.4			(99.9	)		37.0
Income tax provision		—			12.2			—			(13.0	)		—			(0.8	)

Net income (loss)		35.5			22.3			(2.1	)		80.4			(99.9	)		36.2
Net income (loss) attributable to minority interest		—			—			—			—			(0.7	)		(0.7	)

Net income (loss) attributable to ON Semiconductor Corporation	$	35.5		$	22.3		$	(2.1	)	$	80.4		$	(100.6	)	$	35.5

Comprehensive income (loss):
Net income (loss)	$	35.5		$	22.3		$	(2.1	)	$	80.4		$	(99.9	)	$	36.2
Foreign currency translation adjustments		0.4			0.4			—			—			(0.4	)		0.4

Comprehensive income		35.9			22.7			(2.1	)		80.4			(100.3	)		36.6
Comprehensive income attributable to minority interests		—			—			—			—			(0.7	)		(0.7	)

Comprehensive income (loss) attributable to ON Semiconductor Corporation	$	35.9		$	22.7		$	(2.1	)	$	80.4		$	(101.0	)	$	35.9

Net cash provided by operating activities	$	—		$	69.3		$	(0.1	)	$	56.4		$	—		$	125.6

Cash flows from investing activities:
Purchases of property, plant and equipment		—			(20.9	)		(0.1	)		(67.7	)		—			(88.7	)
Purchase of a business, net of cash acquired		—			53.0			—			(110.6	)		—			(57.6	)
Purchase of restricted cash		—			142.1			—			—			—			142.1

Net cash used in investing activities		—			174.2			(0.1	)		(178.3	)		—			(4.2	)

Cash flows from financing activities:
Intercompany loans		—			(375.1	)		—			375.1			—			—
Intercompany loan repayments		—			144.8			—			(144.8	)		—			—
Proceeds from issuance of common stock under the employee stock purchase plan		—			1.9			—			—			—			1.9
Proceeds from debt issuance		—			—			—			15.2			—			15.2
Proceeds from exercise of stock options		—			41.1			—			—			—			41.1
Payment of capital lease obligation		—			(10.0	)		—			0.1			—			(9.9	)
Purchase of treasury stock		—			(7.6	)		—			—			—			(7.6	)
Repayment of long term debt		—			(0.3	)					(19.3	)		—			(19.6	)

Net cash used in financing activities		—			(205.2	)		—			226.3			—			21.1

Effect of exchange rate changes on cash and cash equivalents		—			—			—			0.2			—			0.2

Net increase (decrease) in cash and cash equivalents		—			38.3			(0.2	)		104.6			—			142.7
Cash and cash equivalents, beginning of period		—			392.3			—			231.0			—			623.3

Cash and cash equivalents, end of period	$	—		$	430.6		$	(0.2	)	$	335.6		$	—			766.0

(1)	ON Semiconductor is a holding company and has no operations apart from those of its operating subsidiaries. Additionally, ON Semiconductor does not maintain a bank account; rather SCI LLC, its primary domestic operating subsidiary, processes all of its cash receipts and disbursements on its behalf.

Supplemental Disclosures Of Cash Flow Information

3 Months Ended

Mar. 30, 2012

Supplemental Disclosure Of Cash Flow Information [Abstract]

Supplemental Disclosure Of Cash Flow Information

Note 12: Supplemental Disclosures of Cash Flow Information

The Company's non-cash financing activities and cash payments for interest and income taxes are as follows (in millions):


	For Quarters Ended
	March 30, 2012			April 1, 2011
Non-cash financing activities:
Capital expenditures in accounts payable	$	105.0		$	55.1
Equipment acquired or refinanced through capital leases	$	—		$	8.3
Cash (received) paid for:
Interest income	$	(0.5	)	$	(0.3	)
Interest expense	$	8.5		$	9.1
Income taxes	$	4.6		$	2.1

Earnings Per Share And Equity (Tables)

3 Months Ended

Mar. 30, 2012

Earnings Per Share And Equity [Abstract]

Income Per Share Calculations


	Quarter Ended
	March 30, 2012		April 1, 2011
Net income applicable to ON Semiconductor Corporation	$	28.2	$	35.5

Basic weighted average common shares outstanding		452.5		441.4
Add: Incremental shares for:
Dilutive effect of stock options and awards		5.1		10.8
Dilutive effect of convertible notes		3.0		3.8

Diluted weighted average common shares outstanding		460.6		456.0

Net income per common share attributable to ON Semiconductor Corporation
Basic:	$	0.06	$	0.08

Diluted:	$	0.06	$	0.08

Financial Instruments

3 Months Ended

Mar. 30, 2012

Financial Instruments [Abstract]

Financial Instruments

Note 11: Financial Instruments

Foreign Currencies

As a multinational business, the Company's transactions are denominated in a variety of currencies. When appropriate, the Company uses forward foreign currency contracts to reduce its overall exposure to the effects of currency fluctuations on its results of operations and cash flows. The Company's policy prohibits trading in currencies for which there are no underlying exposures, or entering into trades for any currency to intentionally increase the underlying exposure.

The Company primarily hedges existing assets and liabilities and cash flows associated with transactions currently on its balance sheet.

As of March 30, 2012 and December 31, 2011, the Company had net outstanding foreign exchange contracts in a sell position with a net notional amount of $170.2 million and $203.4 million, respectively. Such contracts were obtained through financial institutions and were scheduled to mature within three months. Management believes that these financial instruments should not subject the Company to increased risks from foreign exchange movements because gains and losses on these contracts should offset losses and gains on the assets, liabilities and transactions being hedged. The following schedule shows the Company's net foreign exchange positions in U.S. dollars as of March 30, 2012 and December 31, 2011 (in millions):


	March 30, 2012					December 31, 2011
	Buy (Sell)			Notional Amount		Buy (Sell)			Notional Amount
Chinese Renminbi	$	(8.4	)	$	8.4	$	(12.8	)	$	12.8
Euro		(38.2	)		38.2		(30.8	)		30.8
Japanese Yen		(68.5	)		68.5		(100.0	)		100.0
Malaysian Ringgit		29.4			29.4		29.4			29.4
Other Currencies		6.9			25.7		7.6			30.4

	$	(78.8	)	$	170.2	$	(106.6	)	$	203.4

The Company is exposed to credit-related losses if counterparties to its foreign exchange contracts fail to perform their obligations. As of March 30, 2012, the counterparty on the Company's foreign exchange contracts is a highly rated financial institution and no credit-related losses are anticipated. Amounts payable or receivable under the contracts are included in other current assets or accrued expenses in the accompanying consolidated balance sheet. For March 30, 2012 and April 1, 2011, realized and unrealized foreign currency transaction gains/losses totaled a gain of $4.7 million and a loss of $2.5 million, respectively.

Cash Flow Hedges

The Company is exposed to global market risks associated with fluctuations in interest rates and foreign currency exchange rates. The Company addresses these risks through controlled management that includes the use of derivative financial instruments to economically hedge or reduce these exposures. The Company does not enter into derivative financial instruments for trading or speculative purposes.

The purpose of the Company's foreign currency hedging activities is to protect the Company from the risk that the eventual cash flows resulting from transactions in foreign currencies will be adversely affected by changes in exchange rates. The Company enters into forward contracts that are designated as foreign-currency cash flow hedges of selected forecasted payments denominated in currencies other than U.S. dollars. All the contracts mature within 12 months and upon maturity the amount recorded in accumulated other comprehensive income are reclassified into earnings.The Company documents all relationships between designated hedging instruments and hedged items, as well as its risk management objective and strategy for undertaking hedge transactions.

All derivatives are recognized on the balance sheet at their fair value and classified based on the instrument's maturity date. The total notional amount of outstanding derivatives designated as cash flow hedges as of March 30, 2012, was approximately $46.0 million, which is primarily comprised of cash flow hedges for Malaysian Ringgit/U.S. Dollar, and Philippine Peso/U.S. Dollar currency pairs.

For the quarter ended March 30, 2012, the Company recorded a loss of $0.4 million, recognized in other comprehensive income on derivatives associated with cash flow hedges. As of March 30, 2012 the Company had liability balances for contracts designated as cash flow hedging instruments of $0.2 million, which were classified as other liabilities. For the quarter ended April 1, 2011, there was no cash flow hedging activity.

As of March 30, 2012 and April 1, 2011, the Company had balances for contracts not designated as hedging instruments of $0.4 million and $0.4 million, which was classified as other assets. Additionally, as of April 1, 2011, the Company had liability balances for contracts not designated as hedging instruments of $0.7 million, which were classified as other liabilities.

Goodwill And Intangible Assets (Tables)

3 Months Ended

Mar. 30, 2012

Goodwill And Intangible Assets [Abstract]

Summary Of Goodwill By Operating Segment


	Balance as of March 30, 2012										Balance as of December 31, 2011
	Original Goodwill		Accumulated Amortization			Accumulated Impairment Losses			Carrying Value		Original Goodwill		Accumulated Amortization			Accumulated Impairment Losses			Carrying Value
Operating Segment:
Automotive, Industrial, Medical and Mil-Aero	$	556.6	$	(4.2	)	$	(406.0	)	$	146.4		556.6		(4.2	)		(406.0	)		146.4
Computing & Consumer Products		29.1		(5.6	)		—			23.5		29.1		(5.6	)		—			23.5
Standard Products		37.7		—			(8.9	)		28.8		37.7		—			(8.9	)		28.8

	$	623.4	$	(9.8	)	$	(414.9	)	$	198.7	$	623.4	$	(9.8	)	$	(414.9	)		198.7

Summary Of Intangible Assets, Net


	March 30, 2012
	Original Cost		Accumulated Amortization			Foreign Currency Translation Adjustment			Impairment			Carrying Value		Useful Life (in Years)
Intellectual property	$	13.9	$	(8.2	)	$	—		$	—		$	5.7		5-12
Customer relationships		280.3		(77.0	)		(26.8	)		(3.2	)		173.3		5-18
Patents		43.7		(12.0	)		—			—			31.7		12
Developed technology		146.2		(39.2	)		—			(2.0	)		105.0		5-12
Trademarks		14.0		(3.9	)		—			—			10.1		15
In-process research and development		2.5		—			—			(2.5	)		—

Total intangibles	$	500.6	$	(140.3	)	$	(26.8	)	$	(7.7	)	$	325.8


	December 31, 2011
	Original Cost		Accumulated Amortization			Foreign Currency Translation Adjustment			Impairment			Carrying Value		Useful Life (in Years)
Intellectual property	$	13.9	$	(8.0	)	$	—		$	—		$	5.9		5-12
Customer relationships		280.3		(71.9	)		(26.5	)		(3.2	)		178.7		5-18
Patents		43.7		(10.4	)		—			—			33.3		12
Developed technology		145.6		(35.5	)		—			(2.0	)		108.1		5-12
Trademarks		14.0		(3.4	)		—						10.6		15
In-process research and development		3.1		—			—			(2.5	)		0.6

Total intangibles		500.6		(129.2	)		(26.5	)		(7.7	)		337.2

Summary Of Amortization Expense


	Total
Remainder of 2012	$	33.3
2013		39.7
2014		38.5
2015		37.4
2016		34.4
Thereafter		142.5

Total estimated amortization expense	$	325.8

- Definition

Tabular disclosure of goodwill by reportable segment and in total. Disclosure details may include, but are not limited to, the carrying amount of goodwill, goodwill acquired during the year, goodwill impairment losses recognized, goodwill written-off due to the sale of a business unit, goodwill not yet allocated, and any other changes to goodwill.

+ References + Details

Consolidated Statements Of Comprehensive Income - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 30, 2012	Apr. 01, 2011
Consolidated Statements Of Comprehensive Income [Abstract]
Revenues	$ 744.4	$ 870.6
Cost of product revenues	499.2	628.2
Gross profit	245.2	242.4
Operating expenses:
Research and development	91.4	91.1
Selling and marketing	45.6	49.4
General and administrative	42.0	47.1
Amortization of acquisition-related intangible assets	11.1	9.7
Restructuring, asset impairments and other, net	11.5	12.4
Total operating expenses	201.6	209.7
Operating income	43.6	32.7
Other income (expenses), net:
Interest expense	(15.7)	(17.8)
Interest income	0.5	0.3
Other	4.7	(2.5)
Gain on SANYO Semiconductor acquisition		24.3
Other income (expenses), net	(10.5)	4.3
Income before income taxes	33.1	37.0
Income tax provision	(4.1)	(0.8)
Net income	29.0	36.2
Less: Net income attributable to minority interests	(0.8)	(0.7)
Net income attributable to ON Semiconductor Corporation	28.2	35.5
Comprehensive income:
Foreign currency translation adjustments	4.9	0.4
Effects of cash flow hedges	(0.4)
Unrealized gain on available-for-sale securities	0.5
Amortization of prior service costs of defined benefit plan	0.1
Comprehensive income	34.1	36.6
Comprehensive income attributable to minority interests	(0.8)	(0.7)
Comprehensive income attributable to ON Semiconductor Corporation	$ 33.3	$ 35.9
Net income per common share attributable to ON Semiconductor Corporation:
Basic	$ 0.06	$ 0.08
Diluted	$ 0.06	$ 0.08
Weighted average common shares outstanding:
Basic	452.5	441.4
Diluted	460.6	456.0

Share-Based Compensation (Summary Of Restricted Stock Units Transactions) (Details) - Restricted Stock Units [Member] shares in Millions	3 Months Ended
	Mar. 30, 2012 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Nonvested shares of restricted stock units at December 31, 2011 \| shares	9.6
Number of Shares, Granted \| shares	3.1
Number of Shares, Released \| shares	(2.0)
Number of Shares, Forfeited \| shares	(0.1)
Nonvested shares of restricted stock units at December 31, 2011 \| shares	10.6
Weighted Average Grant Date Fair Value, Nonvested shares of restricted stock units at December 31, 2010 \| $ / shares	$ 7.95
Weighted Average Grant Date Fair Value, Granted \| $ / shares	8.40
Weighted Average Grant Date Fair Value, Released \| $ / shares	5.75
Weighted Average Grant Date Fair Value, Forfeited \| $ / shares	8.69
Weighted Average Grant Date Fair Value, Nonvested shares of restricted stock units at March 30, 2012 \| $ / shares	$ 8.49

Segment Information (Revenues By Geographic Location Including Local Sales And Exports) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 30, 2012	Apr. 01, 2011
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 744.4	$ 870.6
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	111.3	127.2
Other Americas [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	9.4	6.2
United Kingdom [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	105.8	109.9
Belgium [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	0.1	0.9
China [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	218.3	269.9
Japan [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	115.2	125.4
Singapore [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	143.5	170.8
Other Asia/Pacific [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 40.8	$ 60.3

Guarantor And Non-Guarantor Statements

3 Months Ended

Mar. 30, 2012

Guarantor And Non-Guarantor Statements [Abstract]

Guarantor And Non-Guarantor Statements

Note 14: Guarantor and Non-Guarantor Statements

ON Semiconductor is the sole issuer of the Convertible Notes. ON Semiconductor's domestic subsidiaries, except those domestic subsidiaries acquired through the acquisitions of AMIS, Catalyst Semiconductor, Inc., PulseCore Holdings (Cayman) Inc., California Micro Devices, Sound Design Technologies, and SANYO Semiconductor (collectively, the "Guarantor Subsidiaries"), fully and unconditionally guarantee on a joint and several basis ON Semiconductor's obligations under the Convertible Notes. The Guarantor Subsidiaries include SCI LLC and Semiconductor Components Industries of Rhode Island, Inc., as well as other holding companies whose net assets consist primarily of investments in the joint venture in Leshan, China and equity interests in the Company's other foreign subsidiaries. ON Semiconductor's other remaining subsidiaries (collectively, the "Non-Guarantor Subsidiaries") are not guarantors of the Convertible Notes. The repayment of the unsecured Convertible Notes is subordinated to the senior indebtedness of ON Semiconductor and the Guarantor Subsidiaries on the terms described in the indentures for such Convertible Notes. Condensed consolidated financial information for the issuer of the Convertible Notes, the Guarantor Subsidiaries and the Non-Guarantor Subsidiaries is as follows (in millions):


	Issuer			Guarantor
	ON Semiconductor Corporation ⁽¹⁾			SCI LLC			Other Subsidiaries			Non-Guarantor Subsidiaries			Eliminations			Total
As of March 30, 2012
Cash and cash equivalents	$	—		$	232.7		$	(0.9	)	$	348.3		$	—		$	580.1
Short-term investments		—			312.2			—			—			—			312.2
Receivables, net		—			56.9			—			368.4			—			425.3
Inventories		—			35.8			—			605.5			(7.6	)		633.7
Other current assets		—			9.9			—			66.9			—			76.8
Deferred income taxes, net of allowances		—			5.5			—			4.8			—			10.3

Total current assets		—			653.0			(0.9	)		1,393.9			(7.6	)		2,038.4
Property, plant and equipment, net		—			258.3			2.7			897.3			(2.8	)		1,155.5
Deferred income taxes, net of allowances		—			—			—			30.1			—			30.1
Goodwill		—			125.7			37.3			35.7			—			198.7
Intangible assets, net		—			147.8			—			207.1			(29.1	)		325.8
Investments and other assets		2,086.9			1,341.2			61.0			852.9			(4,261.3	)		80.7

Total assets	$	2,086.9		$	2,526.0		$	100.1		$	3,417.0		$	(4,300.8	)	$	3,829.2

Accounts payable	$	—		$	31.3		$	—		$	377.3		$	—		$	408.6
Accrued expenses		—			56.8			0.8			179.2			1.7			238.5
Income taxes payable		—			(8.4	)		—			11.2			—			2.8
Accrued interest		3.8			0.2			—			0.2			—			4.2
Deferred income on sales to distributors		—			39.7			—			113.8			—			153.5
Deferred income taxes, net of allowances		—			—			—			29.6			—			29.6
Current portion of long-term debt		186.0			70.9			—			120.2			—			377.1

Total current liabilities		189.8			190.5			0.8			831.5			1.7			1,214.3
Long-term debt		388.4			375.3			—			48.2			—			811.9
Other long-term liabilities		—			25.8			0.4			221.2			—			247.4
Deferred income taxes, net of allowances		—			5.5			—			15.6			—			21.1
Intercompany		0.3			(303.2	)		(51.5	)		148.9			205.5			—

Total liabilities		578.5			293.9			(50.3	)		1,265.4			207.2			2,294.7
Common stock		5.1			0.3			50.9			147.2			(198.4	)		5.1
Additional paid-in capital		3,125.6			2,716.6			238.4			1,359.5			(4,314.5	)		3,125.6
Accumulated other comprehensive loss		(41.6	)		(41.6	)		—			(34.5	)		76.1			(41.6	)
Accumulated deficit		(1,174.1	)		(443.2	)		(138.9	)		679.4			(97.3	)		(1,174.1	)
Less: treasury stock, at cost		(406.6	)		—			—			—			—			(406.6	)

Total ON Semiconductor Corporation stockholders' equity (deficit)		1,508.4			2,232.1			150.4			2,151.6			(4,534.1	)		1,508.4
Minority interests in consolidated subsidiaries		—			—			—			—			26.1			26.1

Total equity		1,508.4			2,232.1			150.4			2,151.6			(4,508.0	)		1,534.5

Total liabilities and equity	$	2,086.9		$	2,526.0		$	100.1		$	3,417.0		$	(4,300.8	)	$	3,829.2


	Issuer			Guarantor
	ON Semiconductor Corporation ⁽¹⁾			SCI LLC			Other Subsidiaries			Non-Guarantor Subsidiaries			Eliminations			Total
As of December 31, 2011
Cash and cash equivalents	$	—			304.5			(0.2	)	$	348.6			—		$	652.9
Short-term investments		—			248.6			—			—			—			248.6
Receivables, net		—			64.7			—			392.5			—			457.2
Inventories		—			36.2			—			599.3			1.9			637.4
Other current assets		—			7.5			—			114.1			—			121.6
Deferred income taxes, net of allowances		—			5.5			—			4.5			—			10.0

Total current assets		—			667.0			(0.2	)		1,459.0			1.9			2,127.7
Property, plant and equipment, net		—			255.2			2.3			854.5			(2.5	)		1,109.5
Deferred income taxes, net of allowances		—			—			—			34.2			—			34.2
Goodwill		—			125.7			37.3			35.7			—			198.7
Intangible assets, net		—			152.3						215.0			(30.1	)		337.2
Investments and other assets		2,036.2			1,303.5			59.1			846.9			(4,169.5	)		76.2

Total assets	$	2,036.2		$	2,503.7		$	98.5		$	3,445.3		$	(4,200.2	)	$	3,883.5

Accounts payable	$	—		$	32.8			0.1			418.9			—		$	451.8
Accrued expenses		—			61.0			0.8			176.3			1.7			239.8
Income taxes payable		—			(0.1	)		—			7.6			—			7.5
Accrued interest		0.6			—			—			0.1			—			0.7
Deferred income on sales to distributors		—			43.7			—			128.3			—			172.0
Deferred income taxes, net of allowances		—			—			—			33.6			—			33.6
Current portion of long-term debt		182.6			74.1			—			113.4			—			370.1

Total current liabilities		183.2			211.5			0.9			878.2			1.7			1,275.5
Long-term debt		384.5			393.8			—			58.6			—			836.9
Other long-term liabilities		—			26.6			0.4			233.1			—			260.1
Deferred income tax, net of allowances		—			5.5			—			12.0			—			17.5
Intercompany		0.3			(318.2	)		(54.5	)		166.9			205.5			—

Total liabilities		568.0			319.2			(53.2	)		1,348.8			207.2			2,390.0
Common stock		5.0			0.3			50.9			146.9			(198.1	)		5.0
Additional paid-in capital		3,113.5			2,711.2			238.4			1,359.2			(4,308.8	)		3,113.5
Accumulated other comprehensive loss		(46.7	)		(46.7	)		—			(39.2	)		85.9			(46.7	)
Accumulated deficit		(1,202.3	)		(480.3	)		(137.6	)		629.6			(11.7	)		(1,202.3	)
Less: treasury stock, at cost		(401.3	)		—			—			—			—			(401.3	)

Total ON Semiconductor Corporation stockholders' equity (deficit)		1,468.2			2,184.5			151.7			2,096.5			(4,432.7	)		1,468.2
Minority interests in consolidated subsidiaries		—			—			—			—			25.3			25.3

Total equity		1,468.2			2,184.5			151.7			2,096.5			(4,407.4	)		1,493.5

Total liabilities and equity	$	2,036.2		$	2,503.7		$	98.5		$	3,445.3		$	(4,200.2	)	$	3,883.5


	Issuer			Guarantor Subsidiaries
	ON Semiconductor Corporation ⁽¹⁾			SCI LLC			Other Subsidiaries			Non-Guarantor Subsidiaries			Eliminations			Total
For the quarter ended March 30, 2012
Revenues	$	—		$	185.6		$	—		$	893.5		$	(334.7	)	$	744.4
Cost of product revenues		—			116.1			0.2			708.1			(325.2	)		499.2

Gross profit		—			69.5			(0.2	)		185.4			(9.5	)		245.2

Research and development		—			43.2			2.6			45.6			—			91.4
Selling and marketing		—			17.1			0.2			28.3			—			45.6
General and administrative		—			15.2			0.2			26.6			—			42.0
Amortization of acquisition related intangible assets		—			4.5			—			7.6			(1.0	)		11.1
Restructuring, asset impairments and other, net		—			—			—			11.5			—			11.5

Total operating expenses		—			80.0			3.0			119.6			(1.0	)		201.6

Operating income (loss)		—			(10.5	)		(3.2	)		65.8			(8.5	)		43.6
Interest expense		(10.9	)		(2.3	)		—			(2.5	)		—			(15.7	)
Interest income		—			0.3			—			0.2			—			0.5
Other		—			6.2			—			(1.5	)		—			4.7
Equity in earnings		39.1			34.9			1.9			—			(75.9	)		—

Income (loss) before income taxes		28.2			28.6			(1.3	)		62.0			(84.4	)		33.1
Income tax provision		—			8.5			—			(12.6	)		—			(4.1	)

Net income (loss)		28.2			37.1			(1.3	)		49.4			(84.4	)		29.0
Net income attributable to minority interest		—			—			—			—			(0.8	)		(0.8	)

Net income (loss) attributable to ON Semiconductor Corporation	$	28.2		$	37.1		$	(1.3	)	$	49.4		$	(85.2	)	$	28.2

Comprehensive income:
Net income	$	28.2		$	37.1		$	(1.3	)	$	49.4		$	(84.4	)	$	29.0
Foreign currency translation adjustments		4.9			0.8			—			4.1			(4.9	)		4.9
Effects of cash flow hedges		(0.4	)		(0.4	)		—			—			0.4			(0.4	)
Unrealized gain on available-for-sale securities		0.5			—			—			0.5			(0.5	)		0.5
Amortization of prior service costs of defined benefit plan		0.1			—			—			0.1			(0.1	)		0.1

Comprehensive income		33.3			37.5			(1.3	)		54.1			(89.5	)		34.1
Comprehensive income attributable to minority interest		—			—			—			—			(0.8	)	$	(0.8	)

Comprehensive income attributable to ON Semiconductor Corporation:	$	33.3		$	37.5		$	(1.3	)	$	54.1		$	(90.3	)	$	33.3

Net cash (used in) provided by operating activities	$	—		$	(31.3	)	$	(0.2	)	$	99.9		$	—		$	68.4

Cash flows from investing activities:
Purchases of property, plant and equipment		—			(11.2	)		(0.5	)		(38.7	)		—			(50.4	)
Proceeds from sales of property, plant and equipment		—			—			—			1.9			—			1.9
Deposits utilized for purchases of property, plant and equipment		—			—			—			(9.6	)		—			(9.6	)
Recovery from insurance on property, plant and equipment		—			—			—			11.5			—			11.5
Proceeds from held-to-maturity securities		—			99.7			—			—			—			99.7
Purchase of held-to-maturity securities		—			(163.3	)		—			—			—			(163.3	)

Net cash used in investing activities		—			(74.8	)		(0.5	)		(34.9	)		—			(110.2	)

Cash flows from financing activities:
Intercompany loans		—			(23.3	)		—			23.3			—			—
Intercompany loan repayments		—			70.2			—			(70.2	)		—			—
Proceeds from debt issuance		—			—			—			2.0			—			2.0
Proceeds from exercise of stock options		—			4.8			—			—						4.8
Payment of capital lease obligation		—			(11.0	)		—			(0.4	)					(11.4	)
Purchase of treasury stock		—			(5.3	)		—			—			—			(5.3	)
Repayment of long term debt		—			(1.1	)		—			(14.5	)		—			(15.6	)

Net cash provided by (used in) financing activities		—			34.3			—			(59.8	)		—			(25.5	)

Effect of exchange rate changes on cash and cash equivalents											(5.5	)					(5.5	)

Net increase (decrease) in cash and cash equivalents		—			(71.8	)		(0.7	)		(0.3	)		—			(72.8	)
Cash and cash equivalents, beginning of period		—			304.5			(0.2	)		348.6						652.9

Cash and cash equivalents, end of period	$	—		$	232.7		$	(0.9	)	$	348.3		$	—		$	580.1


	Issuers			Guarantor Subsidiaries
	ON Semiconductor Corporation ⁽¹⁾			SCI LLC			Other Subsidiaries			Non-Guarantor Subsidiaries			Eliminations			Total
For the quarter ended April 1, 2011
Revenues	$	—		$	208.6		$	—		$	1,003.1		$	(341.1	)	$	870.6
Cost of product revenues		—			154.9			0.3			805.9			(332.9	)		628.2

Gross profit		—			53.7			(0.3	)		197.2			(8.2	)		242.4

Research and development		—			59.3			3.0			28.8			—			91.1
Selling and marketing		—			21.4			0.3			27.7			—			49.4
General and administrative		—			27.4			0.2			19.5			—			47.1
Amortization of acquisition related intangible assets		—			4.4			—			6.3			(1.0	)		9.7
Restructuring, asset impairments and other, net		—			—			—			12.4			—			12.4

Total operating expenses		—			112.5			3.5			94.7			(1.0	)		209.7

Operating income (loss)		—			(58.8	)		(3.8	)		102.5			(7.2	)		32.7
Interest expense		(12.9	)		(2.2	)		—			(2.7	)		—			(17.8	)
Interest income		—			0.1			—			0.2			—			0.3
Other		—			4.1			—			(6.6	)		—			(2.5	)
Gain (loss) on SANYO Semiconductor acquisition		—			24.3			—			—			—			24.3
Loss on debt repurchase		—			—			—			—			—			—
Equity in earnings		48.4			42.6			1.7			—			(92.7	)		—

Income (loss) before income taxes		35.5			10.1			(2.1	)		93.4			(99.9	)		37.0
Income tax provision		—			12.2			—			(13.0	)		—			(0.8	)

Net income (loss)		35.5			22.3			(2.1	)		80.4			(99.9	)		36.2
Net income (loss) attributable to minority interest		—			—			—			—			(0.7	)		(0.7	)

Net income (loss) attributable to ON Semiconductor Corporation	$	35.5		$	22.3		$	(2.1	)	$	80.4		$	(100.6	)	$	35.5

Comprehensive income (loss):
Net income (loss)	$	35.5		$	22.3		$	(2.1	)	$	80.4		$	(99.9	)	$	36.2
Foreign currency translation adjustments		0.4			0.4			—			—			(0.4	)		0.4

Comprehensive income		35.9			22.7			(2.1	)		80.4			(100.3	)		36.6
Comprehensive income attributable to minority interests		—			—			—			—			(0.7	)		(0.7	)

Comprehensive income (loss) attributable to ON Semiconductor Corporation	$	35.9		$	22.7		$	(2.1	)	$	80.4		$	(101.0	)	$	35.9

Net cash provided by operating activities	$	—		$	69.3		$	(0.1	)	$	56.4		$	—		$	125.6

Cash flows from investing activities:
Purchases of property, plant and equipment		—			(20.9	)		(0.1	)		(67.7	)		—			(88.7	)
Purchase of a business, net of cash acquired		—			53.0			—			(110.6	)		—			(57.6	)
Purchase of restricted cash		—			142.1			—			—			—			142.1

Net cash used in investing activities		—			174.2			(0.1	)		(178.3	)		—			(4.2	)

Cash flows from financing activities:
Intercompany loans		—			(375.1	)		—			375.1			—			—
Intercompany loan repayments		—			144.8			—			(144.8	)		—			—
Proceeds from issuance of common stock under the employee stock purchase plan		—			1.9			—			—			—			1.9
Proceeds from debt issuance		—			—			—			15.2			—			15.2
Proceeds from exercise of stock options		—			41.1			—			—			—			41.1
Payment of capital lease obligation		—			(10.0	)		—			0.1			—			(9.9	)
Purchase of treasury stock		—			(7.6	)		—			—			—			(7.6	)
Repayment of long term debt		—			(0.3	)					(19.3	)		—			(19.6	)

Net cash used in financing activities		—			(205.2	)		—			226.3			—			21.1

Effect of exchange rate changes on cash and cash equivalents		—			—			—			0.2			—			0.2

Net increase (decrease) in cash and cash equivalents		—			38.3			(0.2	)		104.6			—			142.7
Cash and cash equivalents, beginning of period		—			392.3			—			231.0			—			623.3

Cash and cash equivalents, end of period	$	—		$	430.6		$	(0.2	)	$	335.6		$	—			766.0

(1)	ON Semiconductor is a holding company and has no operations apart from those of its operating subsidiaries. Additionally, ON Semiconductor does not maintain a bank account; rather SCI LLC, its primary domestic operating subsidiary, processes all of its cash receipts and disbursements on its behalf.

See also Note 9: "Commitments and Contingencies—Other Contingencies" for further discussion of the Company's guarantees.

Commitments And Contingencies (Operating Leases Future Minimum Payments Receivable) (Details) $ in Millions	Mar. 30, 2012 USD ($)
Commitments And Contingencies [Abstract]
Remainder of 2012	$ 24.3
2013	20.6
2014	16.8
2015	14.1
2016	12.3
Thereafter	26.6
Total	$ 114.7

Commitments And Contingencies (Tables)

3 Months Ended

Mar. 30, 2012

Commitments And Contingencies [Abstract]

Operating Leases Future Minimum Payments Receivable


Remainder of 2012		24.3
2013		20.6
2014		16.8
2015		14.1
2016		12.3
Thereafter		26.6

Total	$	114.7

Restructuring, Asset Impairments And Other, Net

3 Months Ended

Mar. 30, 2012

Restructuring, Asset Impairments And Other, Net [Abstract]

Restructuring, Asset Impairments And Other, Net

Note 4: Restructuring, Asset Impairments and Other, Net

A summary description of the activity included in the "Restructuring, Asset Impairments and Other, Net" caption on the consolidated statement of comprehensive income for the quarter ended March 30, 2012 is as follows (in millions):


	Restructuring		Other		Total
Three months ended March 30, 2012
Thailand facility closure	$	1.5	$	1.8	$	3.3
Aizu facility closure		5.8		0.1		5.9
SANYO Semiconductor consolidation		—		2.3		2.3

Total	$	7.3	$	4.2	$	11.5

The following is a rollforward of the accrued restructuring charges from December 31, 2011 to March 30, 2012 (in millions):


	Balance as of December 31, 2011		Charges		Usage			Adjustments			Balance as of March 30, 2012
Estimated employee separation charges:	$	8.9	$	7.3	$	(1.5	)	$	(0.8	)	$	13.9

Estimated costs to exit:	$	8.4	$	2.4	$	(0.5	)	$	—		$	10.3

The activity related to the Company's restructuring, asset impairments and other, net for programs that were either initiated in 2012 or had not been completed as of March 30, 2012, are as follows:

Thailand Facility Closure

Cumulative charges of $15.2 million, net of adjustments, have been recognized through March 30, 2012, related to the 2011 announced plan to close our probe, assembly and test operations in Ayutthaya, Thailand and to partially close our Bang Pa In, Thailand facility as a result of the flooding in these regions. During the fourth quarter of 2011, a total of approximately 1,600 employees were asked to resign due to such closures. As of March 30, 2012, a total of 45 employees remained to be exited. For the quarter ended March 30, 2012, the Company recorded employee separation charges of approximately $1.5 million related to these terminations. Additionally, the Company recorded net other charges of $1.8 million, which represented $2.3 million of costs incurred associated with the closure and partial closure of these facilities, partially offset by $0.5 million of additional insurance proceeds. These charges have been included in restructuring, asset impairments and other, net on the consolidated statement of comprehensive income for the three months ended March 30, 2012.

The accrued liability associated with employee separation charges as of March 30, 2012 was $0.8 million.

Aizu Facility Closure

Cumulative charges of $75.9 million, net of adjustments, have been recognized through March 30, 2012, related to the announced closure of the Company's Aizu facility, for cost savings purposes. As of March 30, 2012, a total of 207 employees were notified that their employment with the Company would be terminated due to the closure of the Aizu facility. As of March 30, 2012, none of these employees had been exited. For the quarter ended March 30, 2012, the Company recognized restructuring charges of $5.8 million related to severance benefits for employees required to give further services prior to receiving these termination benefits. Additionally, the Company recorded $0.1 million of additional exit costs associated with this closure. These charges have been included in restructuring, asset impairments and other, net on the consolidated statement of comprehensive income for the three months ended March 30, 2012.

The accrued liability associated with employee separation charges at the Aizu facility as of March 30, 2012 was $11.5 million. Additionally, the Company expects to incur additional employee separation charges of $2.8 million and $2.9 million of exit costs during the remainder of 2012 associated with this closure.

SANYO Semiconductor Consolidation

Cumulative charges of $12.3 million, net of adjustments, have been recognized through March 30, 2012, related to the 2011 announced plans to integrate and restructure the operations of SANYO Semiconductor and the Company, in part, for cost savings purposes. For the quarter ended March 30, 2012, the Company recorded an incremental $2.3 million of exit costs relating to the consolidation of factories. These charges have been included in restructuring, asset impairments and other, net on the consolidated statement of comprehensive income for the three months ended March 30, 2012.

2011 Global Workforce Reduction

Cumulative charges of $2.5 million, net of adjustments, have been recognized through March 30, 2012 related to the announced plans to reduce worldwide personnel for cost savings purposes. During the third quarter of 2011, a total of 42 employees were notified that their employment with the Company would be terminated due to their positions being eliminated or consolidated in connection with this restructuring. As of the end of the first quarter of 2012, six of these employees still remained employed by the Company. We expect that all remaining notified individuals will be officially separated from the Company in the fourth quarter of 2012, with all related benefit payments being made in the same period. As of March 30, 2012, the Company had accrued $1.4 million for employee separation charges associated with this activity.

2011 Closure of the Phoenix, Arizona Wafer Manufacturing Facility

Cumulative charges of $4.3 million, have been recognized through March 30, 2012, related to the 2011 closure of the Phoenix, Arizona wafer manufacturing facility.

In the second quarter of 2011, the Company proceeded with its previously announced plans to close the Phoenix, Arizona wafer manufacturing facility for cost saving purposes. A total of 166 employees were notified that their employment with the Company would be terminated due to their positions being eliminated or consolidated in connection with this restructuring. As of March 30, 2012, 10 of these employees remained employed by the Company. The Company had $0.1 million accrued for employee separation charges for the remaining 10 employees who are expected to be separated by the end of the third quarter of 2012.

Acquisition of AMIS Holdings, Inc. ("AMIS")

The Company had $8.1 million of accrued liabilities for estimated costs to exit certain activities of AMIS which was acquired in March 2008, of which $0.1 million were for employee separation costs and $8.0 million were for exit costs outstanding as of March 30, 2012. During the quarter ended March 30, 2012, the Company paid decommissioning costs resulting from the shutdown of a fabrication facility of $0.1 million. All payments related to these activities are expected to be completed by the end of the third quarter of fiscal 2012.

- Definition

The entire disclosure for restructuring and related activities. Description of restructuring activities such as exit and disposal activities, include facts and circumstances leading to the plan, the expected plan completion date, the major types of costs associated with the plan activities, total expected costs, the accrual balance at the end of the period, and the periods over which the remaining accrual will be settled.

+ References + Details

Long-Term Debt

3 Months Ended

Mar. 30, 2012

Long-Term Debt [Abstract]

Long-Term Debt

Note 6: Long-Term Debt

Long-term debt consists of the following (dollars in millions):


	March 30, 2012			December 31, 2011
Senior Revolving Credit Facility (up to $325.0 million)	$	—		$	—
Loan with a Japanese company due 2012 through 2018, interest payable quarterly at 2.22% and 2.33%, respectively (1)		330.3			339.8
Zero Coupon Convertible Senior Subordinated Notes due 2024 (net of discount of $0.3 million and $2.0 million, respectively) (2)		95.9			94.2
1.875% Convertible Senior Subordinated Notes due 2025 (net of discount of $4.9 million and $6.6 million, respectively) (3)		90.1			88.4
2.625% Convertible Senior Subordinated Notes due 2026 (net of discount of $21.6 million and $24.5 million, respectively) (4)		210.8			207.9
2.625% Convertible Senior Subordinated Notes due 2026, Series B (net of discount of $21.1 million and $22.0 million, respectively) (5)		177.5			176.6
Loan with Hong Kong bank, interest payable weekly at 1.99% and 2.04%, respectively		40.0			40.0
Loans with Philippine banks due 2012 through 2015, interest payable monthly and quarterly at an average rate of 2.01% and 2.01%, respectively		65.5			68.2
Loans with Chinese bank due 2013, interest payable quarterly at 4.33% and 4.44%, respectively		7.0			7.0
Loans with Japanese banks due through 2013, interest payable monthly and semi-annually at an average rate of 1.72% and 1.71%, respectively		3.1			3.5
Loan with Singapore bank, interest payable weekly at 1.97% and 1.97%, respectively		27.0			25.0
Loan with British finance company, interest payable monthly at 1.95% and 2.42%, respectively		10.9			13.1
U.S. real estate mortgages payable monthly through 2016 at an average rate of 4.857%		31.2			31.6
U.S. equipment financing payable monthly through 2015 at 3.23%		10.1			10.8
Capital lease obligations		89.6			100.9

Long-term debt, including current maturities		1,189.0			1,207.0
Less: Current maturities		(377.1	)		(370.1	)

Long-term debt	$	811.9		$	836.9

(1)	This loan represents Semiconductor Component Industries, LLC ("SCI LLC") unsecured loan with SANYO Electric, which is guaranteed by the Company.

(2)

(3)	The 1.875% Convertible Senior Subordinated Notes due 2025 may be put back to the Company at the option of the holders of the notes on December 15 of 2012, 2015 and 2020 or called at the option of the Company on or after December 20, 2012.

(4)	The 2.625% Convertible Senior Subordinated Notes due 2026 may be put back to the Company at the option of the holders of the notes on December 15 of 2013, 2016 and 2021 or called at the option of the Company on or after December 20, 2013.

(5)	The 2.625% Convertible Senior Subordinated Notes due 2026, Series B may be put back to the Company at the option of the holders of the notes on December 15 of 2016 and 2021 or called at the option of the Company on or after December 20, 2016.

Expected maturities relating to the Company's long-term debt as of March 30, 2012 are as follows (in millions):


	Expected Maturities
Remainder of 2012		353.7
2013		328.6
2014		75.3
2015		63.5
2016		262.2
Thereafter		153.6

Total	$	1,236.9

For purposes of the table above, the convertible debt issuances are assumed to mature at their respective put dates. The table also reflects aggregate principal payments of $622.2 million relating to the Zero Coupon Convertible Senior Subordinated Notes due 2024, the 1.875% Convertible Senior Subordinated Notes due 2025, the 2.625% Convertible Senior Subordinated Notes due 2026 and the 2.625% Convertible Senior Subordinated Notes due 2026, Series B.

Debt Guarantees

ON Semiconductor is the sole issuer of the Zero Coupon Convertible Senior Subordinated Notes due 2024, the 1.875% Convertible Senior Subordinated Notes due 2025, the 2.625% Convertible Senior Subordinated Notes due 2026 and the 2.625% Convertible Senior Subordinated Notes due 2026, Series B (collectively, the "Convertible Notes"). See Note 14: "Guarantor and Non-Guarantor Statements" for the condensed consolidated financial information for the issuer of the Convertible Notes, the Guarantor Subsidiaries and the Non-Guarantor Subsidiaries.

- Definition

The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants.

+ References + Details

Commitments And Contingencies (Narrative) (Details) $ in Millions		3 Months Ended
	Dec. 27, 2011 USD ($)	Mar. 30, 2012 USD ($)	Mar. 19, 2012 employee	Dec. 31, 2011 USD ($)
Loss Contingencies [Line Items]
Receivable from Nippon Mining		$ 0.1
Credit commitment outstanding		3.6
Guarantee right to mortgage		3.0
Outstanding guarantees and letters of credit		10.1
Guarantees related to capital lease obligations		110.1
Long-term Debt		1,189.0		$ 1,207.0
Expected operating leases cash payments and expenses total		114.7
Remedial payment on alleged failures of products		$ 20.0
Number of additional former employees filed complaints \| employee			46
SANYO Electric [Member]
Loss Contingencies [Line Items]
Long-term Debt				$ 330.3
SANYO Semiconductor Thailand [Member]
Loss Contingencies [Line Items]
Lawsuit filing date		December 27, 2011
Number of former employees filed complaints	112
Number of additional former employees filed complaints		4
Lawsuits alleged damages, value	$ 25.4
Senior Revolving Credit Facility [Member]
Loss Contingencies [Line Items]
Letters of credit outstanding		$ 0.2
Letters of credit capacity		$ 40.0

Balance Sheet Information (Warranty Reserves) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 30, 2012	Apr. 01, 2011
Balance Sheet Information [Abstract]
Beginning Balance	$ 5.8	$ 3.3
Provision	0.1	0.6
Usage	(0.2)
Ending Balance	$ 5.7	$ 3.9

Fair Value Of Financial Instruments (Tables)

3 Months Ended

Mar. 30, 2012

Fair Value Of Financial Instruments [Abstract]

Fair Value Of Assets And Liabilities Measured On Recurring Basis


	March 30, 2012		Quoted Prices in Active Markets (Level 1)		Balance as of December 31, 2011		Quoted Prices in Active Markets (Level 1)
Description
Assets:
Cash and cash equivalents:
Demand and time deposits	$	431.0	$	431.0	$	455.3	$	455.3
Treasuries		92.6		92.6		131.1		131.1
Commercial paper		54.2		54.2		50.9		50.9
Corporate bonds		2.3		2.3		15.6		15.1
Other Current Assets
Foreign currency exchange contracts	$	0.4	$	0.4	$	0.7	$	0.7

Liabilities:
Foreign currency exchange contracts	$	0.2	$	0.2	$	0.1	$	0.1

Carrying Amounts And Fair Values Of Long-Term Borrowings


	March 30, 2012				December 31, 2011
	Carrying Amount		Fair Value		Carrying Amount		Fair Value
Long-term debt, including current portion
Convertible Notes	$	574.3	$	716.5	$	567.1	$	683.9
Long-term debt	$	483.9	$	453.3	$	496.6	$	462.0

Share-Based Compensation (Additional Information On Stock Options Outstanding) (Details) shares in Millions	3 Months Ended
	Mar. 30, 2012 $ / shares shares
Option Price Less Than Closing Price Of Common Stock At End Of Quarter [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Below $9.01	$ 9.01
Number of Shares, Exercisable \| shares	8.5
Weighted Average Exercise Price, Exercisable	$ 6.04
Number of Shares, Unexercisable \| shares	3.5
Weighted Average Exercise Price, Unexercisable	$ 7.74
Number of Shares, Total \| shares	12.0
Weighted Average Exercise Price, Total	$ 6.54
Option Price Above Closing Price Of Common Stock At End Of Quarter [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Above $9.10	$ 9.01
Number of Shares, Exercisable \| shares	6.3
Weighted Average Exercise Price, Exercisable	$ 10.28
Number of Shares, Unexercisable \| shares	0.7
Weighted Average Exercise Price, Unexercisable	$ 9.73
Number of Shares, Total \| shares	7.0
Weighted Average Exercise Price, Total	$ 10.22
Total Outstanding [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of Shares, Exercisable \| shares	14.8
Weighted Average Exercise Price, Exercisable	$ 7.84
Number of Shares, Unexercisable \| shares	4.2
Weighted Average Exercise Price, Unexercisable	$ 8.07
Number of Shares, Total \| shares	19.0
Weighted Average Exercise Price, Total	$ 7.88

Share-Based Compensation (Tables)

3 Months Ended

Mar. 30, 2012

Share-Based Compensation [Abstract]

Summary Of Share-Based Compensation Expense


	Quarter Ended
	March 30, 2012		April 1, 2011
Cost of revenues	$	1.4	$	1.9
Research and development		1.6		2.0
Selling and marketing		1.6		1.9
General and administrative		2.8		4.6

Share-based compensation expense before income taxes	$	7.4	$	10.4

Related income tax benefits ⁽¹⁾		—		—

Share-based compensation expense, net of taxes	$	7.4	$	10.4

(1)	Most of the Company's share-based compensation relates to its domestic subsidiaries, which have historically experienced recurring net operating losses; therefore, no related tax benefits are recorded.

Weighted-Average Assumptions Of Employee Stock Options


	Quarter Ended
	March 30, 2012		April 1, 2011
Volatility		46.7%		41.0%
Risk-free interest rate		0.9%		2.1%
Expected term		4.8 years		4.9 years

Summary Of Stock Option Plans


	Quarter Ended March 30, 2012
	Number of Shares			Weighted-Average Exercise Price		Weighted Average Remaining Contractual Term (in years)		Aggregate Intrinsic Value (In-The-Money)
Outstanding at December 31, 2011		18.7		$	7.70
Granted		1.4			8.40
Exercised		(0.9	)		4.99
Canceled		(0.2	)		7.63

Outstanding at March 30, 2012		19.0		$	7.88		4.6	$	29.8

Exercisable at March 30, 2012		14.8			7.84		4.1	$	25.2

Additional Information On Stock Options Outstanding


	Exercisable				Unexercisable				Total
Exercise Prices	Number of Shares		Weighted Average Exercise Price		Number of Shares		Weighted Average Exercise Price		Number of Shares		Weighted Average Exercise Price
Less than $9.01		8.5	$	6.04		3.5	$	7.74		12.0	$	6.54
Above $9.01		6.3	$	10.28		0.7	$	9.73		7.0	$	10.22

Total Outstanding		14.8	$	7.84		4.2	$	8.07		19.0	$	7.88

Summary Of Restricted Stock Units Transactions


	Quarter Ended March 30, 2012
	Number of Shares			Weighted-Average Grant Date Fair Value
Nonvested shares of restricted stock units at December 31, 2011		9.6		$	7.95
Granted		3.1			8.40
Released		(2.0	)		5.75
Forfeited		(0.1	)		8.69

Nonvested shares of restricted stock units at March 30, 2012		10.6		$	8.49

- Definition

Tabular disclosure of the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed.

+ References + Details

Background And Basis Of Presentation

3 Months Ended

Mar. 30, 2012

Background And Basis Of Presentation [Abstract]

Background And Basis Of Presentation

Note 1: Background and Basis of Presentation

ON Semiconductor Corporation ("ON Semiconductor"), together with its wholly and majority-owned subsidiaries (the "Company"), is a premier supplier of high performance, silicon solutions for energy efficient electronics. The Company's broad portfolio of power and signal management, logic, discrete and custom devices helps customers efficiently solve their design challenges in automotive, communications, computing, consumer, industrial, LED lighting, medical, military/aerospace and power applications.

The accompanying unaudited financial statements as of March 30, 2012, and for the three months ended March 30, 2012 and April 1, 2011, respectively, have been prepared in accordance with generally accepted accounting principles for interim financial information. Accordingly, they do not include all of the information and footnotes required by generally accepted accounting principles for audited financial statements. In the opinion of the Company's management, the interim information includes all adjustments, consisting only of normal recurring adjustments, necessary for a fair statement of the results for the interim periods. The footnote disclosures related to the interim financial information included herein are also unaudited. Such financial information should be read in conjunction with the consolidated financial statements and related notes thereto for the year ended December 31, 2011 included in the Company's Annual Report on Form 10-K for the fiscal year ended December 31, 2011 ("2011 Form 10-K"). The results for the interim periods are not necessarily indicative of the results of operations that may be expected for the full year.

The preparation of financial statements in accordance with generally accepted accounting principles requires management to make estimates and assumptions that affect the reported amount of assets and liabilities at the date of the financial statements and the reported amount of revenues and expenses during the reporting period. Significant estimates have been used by management in conjunction with the measurement of valuation allowances relating to trade and tax receivables, inventories and deferred tax assets; estimates of future payouts for customer incentives, warranties, and restructuring activities; assumptions surrounding future pension obligations and related trust returns; the fair value of stock options and of financial instruments (including derivative financial instruments); and future cash flows associated with long-lived assets and goodwill impairment charges. Actual results could differ from these estimates.

Revision of Prior Period Financial Statements

The Company has retrospectively adjusted the consolidated statement comprehensive income for the quarter ended April 1, 2011, primarily related to adjustments to the purchase price allocation of the SANYO Semiconductor Co. Ltd. ("SANYO Semiconductor") acquisition, which resulted in a reduction of the gain on the SANYO Semiconductor acquisition. The Company originally reported a gain of $61.3 million which has been retrospectively adjusted to $24.3 million.

The following table presents the effects of the above adjustments on the Company's consolidated statements of comprehensive income (in millions):


	For the Quarter Ended April 1, 2011
	As reported			As revised
Other income (expenses), net:
Other	$	(0.2	)	$	(2.5	)
Gain on SANYO Semiconductor acquisition		61.3			24.3
Net income attributable to ON Semiconductor Corporation	$	74.8		$	35.5

Net income per common share attributable to ON Semiconductor Corporation
Basic	$	0.17		$	0.08

Diluted	$	0.16		$	0.08

- Definition

The entire disclosure for organization, consolidation and basis of presentation of financial statements disclosure.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph 2-6
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Name Statement of Position (SOP)
-Publisher AICPA
-Number 94-6
-Paragraph 10
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Name FASB Interpretation (FIN)
-Publisher FASB
-Number 46R
-Paragraph 4, 14, 15
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6367646&loc=d3e18780-107790

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 10
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6359553&loc=d3e288-107754

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-URI http://asc.fasb.org/subtopic&trid=2197480

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6921930&loc=d3e5614-111684

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 915
-SubTopic 235
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-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6472506&loc=d3e38932-110933

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 852
-SubTopic 10
-URI http://asc.fasb.org/subtopic&trid=2209116

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 272
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70478-108055

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 12: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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Reference 13: http://www.xbrl.org/2003/role/presentationRef
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Reference 14: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 15: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 16: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Staff Position (FSP)
-Number FAS140-4/FIN46(R)-8
-Paragraph 8, C1, C7
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Restructuring, Asset Impairments And Other, Net (Narrative) (Details) $ in Millions	3 Months Ended
	Mar. 30, 2012 USD ($) employee	Dec. 31, 2011 USD ($) employee	Sep. 30, 2011 employee	Jul. 01, 2011 employee
Restructuring Cost and Reserve [Line Items]
Accrued liabilities	$ 24.2	$ 17.3
Recovery from insurance on property, plant and equipment	11.5
Estimated Employee Separation Charges [Member]
Restructuring Cost and Reserve [Line Items]
Cumulative restructuring charges, net of adjustments	7.3
Cash paid for exit costs	1.5
Accrued liabilities	13.9	8.9
Estimated Costs To Exit [Member]
Restructuring Cost and Reserve [Line Items]
Cumulative restructuring charges, net of adjustments	2.4
Cash paid for exit costs	0.5
Accrued liabilities	10.3	$ 8.4
Restructuring Activities Related To 2011 Thailand Closure [Member]
Restructuring Cost and Reserve [Line Items]
Cumulative restructuring charges, net of adjustments	15.2
Cash paid for exit costs	1.5
Costs incurred associated with closure of facilities	1.8
Recovery from insurance on property, plant and equipment	0.5
Damaged inventory write-off	$ 2.3
Expected reduction in employment levels \| employee	45
Restructuring Activities Related To 2011 Thailand Closure [Member] \| Accrued Employee Separation Charges [Member]
Restructuring Cost and Reserve [Line Items]
Accrued liabilities	$ 0.8
Restructuring Activities Related To 2011 Aizu Closure [Member]
Restructuring Cost and Reserve [Line Items]
Cumulative restructuring charges, net of adjustments	75.9
Cash paid for exit costs	5.8
Costs incurred associated with closure of facilities	0.1
Restructuring Activities Related To 2011 Aizu Closure [Member] \| Estimated Employee Separation Charges [Member]
Restructuring Cost and Reserve [Line Items]
Additional employee separation charges expected to incur	2.8
Restructuring Activities Related To 2011 Aizu Closure [Member] \| Accrued Employee Separation Charges [Member]
Restructuring Cost and Reserve [Line Items]
Accrued liabilities	11.5
Restructuring Activities Related To 2011 Aizu Closure [Member] \| Estimated Costs To Exit [Member]
Restructuring Cost and Reserve [Line Items]
Costs incurred associated with closure of facilities	2.9
Restructuring Activities Related To The 2011 SANYO Semiconductor Acquisition [Member]
Restructuring Cost and Reserve [Line Items]
Cumulative restructuring charges, net of adjustments	$ 12.3
Expected reduction in employment levels \| employee	500
Restructuring Activities Related To The 2011 SANYO Semiconductor Acquisition [Member] \| Estimated Costs To Exit [Member]
Restructuring Cost and Reserve [Line Items]
Cumulative restructuring charges, net of adjustments	$ 2.3
Restructuring Activities Related To The 2011 Global Workforce Reduction [Member]
Restructuring Cost and Reserve [Line Items]
Cumulative restructuring charges, net of adjustments	2.5
Restructuring Activities Related To The 2011 Global Workforce Reduction [Member] \| Accrued Employee Separation Charges [Member]
Restructuring Cost and Reserve [Line Items]
Accrued liabilities	1.4
Restructuring Activities Related To The 2011 Phoenix Wafer Manufacturing Facility Closure [Member]
Restructuring Cost and Reserve [Line Items]
Cumulative restructuring charges, net of adjustments	$ 4.3
Number of employees terminated \| employee				166
Expected reduction in employment levels \| employee	10
Restructuring Activities Related To The 2011 Phoenix Wafer Manufacturing Facility Closure [Member] \| Accrued Exit Costs [Member]
Restructuring Cost and Reserve [Line Items]
Accrued liabilities	$ 0.1
Acquisition Of AMIS Holdings, Inc. [Member]
Restructuring Cost and Reserve [Line Items]
Accrued liabilities	8.1
Acquisition Of AMIS Holdings, Inc. [Member] \| Estimated Employee Separation Charges [Member]
Restructuring Cost and Reserve [Line Items]
Accrued liabilities	0.1
Acquisition Of AMIS Holdings, Inc. [Member] \| Estimated Costs To Exit [Member]
Restructuring Cost and Reserve [Line Items]
Accrued liabilities	8.0
Acquisition Of AMIS Holdings, Inc. [Member] \| Fabrication Facility [Member]
Restructuring Cost and Reserve [Line Items]
Costs incurred associated with closure of facilities	$ 0.1
Notified But Still Employed [Member] \| Restructuring Activities Related To The 2011 Global Workforce Reduction [Member]
Restructuring Cost and Reserve [Line Items]
Number of employees terminated \| employee		6
Total Employees Notified [Member] \| Restructuring Activities Related To 2011 Thailand Closure [Member]
Restructuring Cost and Reserve [Line Items]
Number of employees terminated \| employee		1,600
Total Employees Notified [Member] \| Restructuring Activities Related To 2011 Aizu Closure [Member]
Restructuring Cost and Reserve [Line Items]
Number of employees terminated \| employee	207
Total Employees Notified [Member] \| Restructuring Activities Related To The 2011 Global Workforce Reduction [Member]
Restructuring Cost and Reserve [Line Items]
Number of employees terminated \| employee			42

Segment Information (Tables)

3 Months Ended

Mar. 30, 2012

Segment Information [Abstract]

Segment Information Of Revenues, Gross Profit And Operating Income


	Computing & Consumer Products Group		Automotive, Industrial, Medical and Mil-Aero Products Group		Standard Products Group		SANYO Semiconductor Products Group			Total
For quarter ended March 30, 2012:
Revenues from external customers	$	138.3	$	203.4	$	196.8	$	205.9		$	744.4
Segment gross profit	$	52.5	$	91.3	$	73.5	$	39.9		$	257.2
Segment operating income (loss)	$	20.9	$	19.7	$	46.9	$	(20.4	)	$	67.1
For quarter ended April 1, 2011:
Revenues from external customers	$	155.7	$	208.7	$	228.1	$	278.1		$	870.6
Segment gross profit	$	63.7	$	104.3	$	86.2	$	4.4		$	258.6
Segment operating income (loss)	$	27.4	$	32.5	$	54.6	$	(42.8	)	$	71.7

Reconciliation Of Operating Profit (Loss) From Segments To Consolidated


	Quarter Ended
	March 30, 2012			April 1, 2011
Gross profit for reportable segments	$	257.2		$	258.6
Unallocated amounts:
Other unallocated manufacturing costs	$	(12.0	)	$	(16.2	)

Gross profit	$	245.2		$	242.4

Operating income for reportable segments	$	67.1		$	71.7
Unallocated amounts:
Restructuring and other charges		(11.5	)		(12.4	)
Other unallocated manufacturing costs		(12.0	)		(16.2	)
Other unallocated operating expenses		—			(10.4	)

Operating income	$	43.6		$	32.7

Revenues By Geographic Location Including Local Sales And Exports


	Quarter Ended
	March 30, 2012		April 1, 2011
United States	$	111.3	$	127.2
Other Americas		9.4		6.2
United Kingdom		105.8		109.9
Belgium		0.1		0.9
China		218.3		269.9
Japan		115.2		125.4
Singapore		143.5		170.8
Other Asia/Pacific		40.8		60.3

	$	744.4	$	870.6

Summary Of Property, Plant And Equipment By Geographic Location


	March 30, 2012		December 31, 2011
United States	$	261.0	$	257.5
China		94.5		96.7
Other Europe		129.0		117.9
Malaysia		172.6		164.5
Philippines		209.6		204.0
Other Asia/Pacific		82.4		56.2
Japan		125.3		130.2
Belgium		68.4		70.0
Other Americas		12.7		12.5

	$	1,155.5	$	1,109.5

- Definition

Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss.

+ References + Details

Restructuring, Asset Impairments And Other, Net (Rollforward Of Accrued Restructuring Charges) (Details) $ in Millions	3 Months Ended
	Mar. 30, 2012 USD ($)
Restructuring Cost and Reserve [Line Items]
Balance at Beginning of Period	$ 17.3
Balance at End of Period	24.2
Estimated Employee Separation Charges [Member]
Restructuring Cost and Reserve [Line Items]
Balance at Beginning of Period	8.9
Charges	7.3
Usage	(1.5)
Adjustments	(0.8)
Balance at End of Period	13.9
Estimated Costs To Exit [Member]
Restructuring Cost and Reserve [Line Items]
Balance at Beginning of Period	8.4
Charges	2.4
Usage	(0.5)
Balance at End of Period	$ 10.3

- Definition

Amount of any reversal and other adjustment made during the period to the amount of a previously accrued liability for a specified type of restructuring cost, excluding adjustments for costs incurred during the period, costs settled during the period, and foreign currency translation adjustments.

+ References + Details

Financial Instruments (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 30, 2012	Apr. 01, 2011	Dec. 31, 2011
Derivatives, Fair Value [Line Items]
Notional Amount	$ 170.2		$ 203.4
Realized and unrealized foreign currency transaction gain/losses	4.7	$ (2.5)
Notional amount of outstanding derivatives designated as cash flow hedges	46.0
Other assets	76.8		121.6
Other liabilities	1,214.3		$ 1,275.5
Loss recognized in other comprehensive income	0.4
Cash Flow Hedging [Member]
Derivatives, Fair Value [Line Items]
Other liabilities	0.2
Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Other assets	$ 0.4	0.4
Other liabilities		$ 0.7

- Definition

The aggregate foreign currency transaction gain (loss) (both realized and unrealized) included in determining net income for the reporting period. Excludes foreign currency transactions designated as hedges of net investment in a foreign entity and intercompany foreign currency transactions that are of a long-term nature, when the entities to the transaction are consolidated, combined, or accounted for by the equity method in the reporting enterprise's financial statements. For certain enterprises, primarily banks, that are dealers in foreign exchange, foreign currency transaction gains (losses) may be disclosed as dealer gains (losses).

+ References + Details

Goodwill And Intangible Assets (Narrative) (Details) $ in Millions	3 Months Ended
	Mar. 30, 2012 USD ($) yr	Apr. 01, 2011 USD ($)	Dec. 31, 2011 USD ($)
Goodwill And Intangible Assets [Line Items]
Amortization expense	$ 11.1	$ 10.3
Cost of goods sold, amortization		$ 0.6
Number of projects amortized	14
Amortized amount of projects	$ 500.6		$ 500.6
Developed Technology Originally Classified As In- Process Research And Development [Member]
Goodwill And Intangible Assets [Line Items]
Amortized amount of projects	$ 33.4
Useful life, minimum (in years) \| yr	8.5
In-Process Research And Development [Member]
Goodwill And Intangible Assets [Line Items]
Amortized amount of projects	$ 2.5		$ 3.1

Earnings Per Share And Equity (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 30, 2012	Apr. 01, 2011	Apr. 16, 2012	Dec. 31, 2011	Dec. 31, 2010
Earnings Per Share And Equity [Line Items]
Anti-dilutive shares	11,300,000	6,100,000
Amounts remitted for applicable withholding taxes on underlying restricted stock units	$ 5.3
Common stock withheld underlying restricted stock units	591,174
Minority interests in consolidated subsidiaries	$ 26.1	$ 22.7		$ 25.3	$ 22.0
Net (income) loss attributable to minority interests	$ 0.8	$ 0.7
Zero Coupon Convertible Senior Subordinated Notes Due 2024 [Member]
Earnings Per Share And Equity [Line Items]
Debt instrument, maturity year	2024
Debt instrument, interest rate	0.00%		0.00%
2.625% Convertible Senior Subordinated Notes Due 2026 [Member]
Earnings Per Share And Equity [Line Items]
Debt instrument, maturity year	2026
Debt instrument, interest rate	2.625%
1.875% Convertible Senior Subordinated Notes Due 2025 [Member]
Earnings Per Share And Equity [Line Items]
Debt instrument, maturity year	2025
Debt instrument, interest rate	1.875%

Fair Value Of Financial Instruments (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 30, 2012	Dec. 31, 2011
Fair Value Of Financial Instruments [Abstract]
Short-term investments	$ 312.2	$ 248.6
Unrealized losses on securities	$ 0.2

Balance Sheet Information

3 Months Ended

Mar. 30, 2012

Balance Sheet Information [Abstract]

Balance Sheet Information

Note 5: Balance Sheet Information


	March 30, 2012			December 31, 2011
	(in millions)			(in millions)
Receivables, net:
Accounts receivable	$	431.6		$	464.3
Less: Allowance for doubtful accounts		(6.3	)		(7.1	)

	$	425.3		$	457.2

Inventories:
Raw materials	$	61.8		$	58.8
Work in process		414.2			430.8
Finished goods		157.7			147.8

	$	633.7		$	637.4

Property, plant and equipment, net:
Land	$	74.3		$	76.6
Buildings		537.7			539.3
Machinery and equipment		1,997.6			1,943.0

Total property, plant and equipment		2,609.6			2,558.9
Less: Accumulated depreciation		(1,454.1	)		(1,449.4	)

	$	1,155.5		$	1,109.5

Accrued expenses:
Accrued payroll	$	127.9		$	125.2
Sales related reserves		53.8			45.5
Restructuring reserves		24.2			17.3
Accrued pension liability		9.8			11.4
Other		22.8			40.4

	$	238.5		$	239.8

Accumulated other comprehensive loss:
Foreign currency translation adjustments	$	(41.6	)	$	(46.5	)
Unrecognized prior service cost of defined benefit pension plan		(0.1	)		(0.2	)
Effect of cash flow hedges		(0.4	)		—
Unrealized gain on available for sale securities		0.5			—

	$	(41.6	)	$	(46.7	)

Included in accumulated other comprehensive loss as of March 30, 2012, and December 31, 2011, is $18.9 million and $18.5 million, respectively, of foreign currency translation gains related to our Aizu, Japan facility. As further described in Note 4: "Restructuring, Asset Impairments and Other, Net," the Company intends to close its Aizu, Japan facility during 2012. After the operational closure is complete, the Company will proceed to liquidate and wind-down the legal entity. As required by accounting standards, when the liquidation is substantially complete, the Company will recognize in results of operations any amount remaining in accumulated other comprehensive income.

Warranty Reserves

The activity related to our warranty reserves for the three months ended March 30, 2012 and April 1, 2011, respectively, is as follows (in millions):


	Quarter Ended
	March 30, 2012			April 1, 2011
Beginning Balance	$	5.8		$	3.3
Provision		0.1			0.6
Usage		(0.2	)		—

Ending Balance	$	5.7		$	3.9

Defined Benefit Plans

The Company maintains defined benefit plans for some of its foreign subsidiaries. The Company recognizes the aggregate amount of all overfunded plans as assets and the aggregate amount of all underfunded plans as liabilities in its financial statements. As of March 30, 2012, the total accrued pension liability for underfunded plans was $67.5 million, of which the current portion of $9.8 million was classified as accrued expenses. As of December 31, 2011, the total accrued pension liability for underfunded plans was $83.3 million, of which the current portion of $11.4 million, was classified as accrued expenses. As of March 30, 2012 and December 31, 2011, the total pension asset for overfunded plans was $12.5 million and $12.4 million, respectively. The components of the Company's net periodic pension expense for the quarters ended March 30, 2012 and April 1, 2011 are as follows (in millions):


	Quarter Ended
	March 30, 2012			April 1, 2011
Service cost	$	2.2		$	2.3
Interest cost		1.3			1.3
Expected return on plan assets		(1.0	)		(1.0	)
Amortization of prior service cost		0.1			0.1

Total net periodic pension cost	$	2.6		$	2.7

Multiemployer Defined Benefit Plans

Included in other long-term liabilities as of March 30, 2012 and December 31, 2011, are the estimated liabilities of $140.1 million and $151.0 million, respectively, which represent the Company's estimated portion of underfunded pension obligations relating to certain employees participating in certain SANYO Electric Co. Ltd., ("SANYO Electric") multiemployer defined benefit pension plans from which the Company intends to withdraw. During the quarters ended March 30, 2012 and April 1, 2011, the Company recorded $2.9 million and $2.9 million, respectively, of expense associated with the Company's participation in the SANYO Electric multiemployer pension plans.

Goodwill And Intangible Assets (Summary Of Goodwill By Operating Segment) (Details) - USD ($) $ in Millions	Mar. 30, 2012	Dec. 31, 2011
Goodwill [Line Items]
Original Goodwill	$ 623.4	$ 623.4
Accumulated Amortization	(9.8)	(9.8)
Accumulated Impairment Losses	(414.9)	(414.9)
Carrying Value	198.7	198.7
Automotive, Industrial, Medical And Mil-Aero [Member]
Goodwill [Line Items]
Original Goodwill	556.6	556.6
Accumulated Amortization	(4.2)	(4.2)
Accumulated Impairment Losses	(406.0)	(406.0)
Carrying Value	146.4	146.4
Computing & Consumer Products [Member]
Goodwill [Line Items]
Original Goodwill	29.1	29.1
Accumulated Amortization	(5.6)	(5.6)
Carrying Value	23.5	23.5
Standard Products [Member]
Goodwill [Line Items]
Original Goodwill	37.7	37.7
Accumulated Impairment Losses	(8.9)	(8.9)
Carrying Value	$ 28.8	$ 28.8

- Definition

Carrying amount as of the balance sheet date, which is the cumulative amount paid and (if applicable) the fair value of any noncontrolling interest in the acquiree, adjusted for any amortization recognized prior to the adoption of any changes in generally accepted accounting principles (as applicable) and for any impairment charges, in excess of the fair value of net assets acquired in one or more business combination transactions.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 142
-Paragraph 45
-Subparagraph e
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 142
-Paragraph 43
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141R
-Paragraph 68
-Subparagraph l
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6905597&loc=d3e13816-109267

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141R
-Paragraph 72
-Subparagraph d
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 142
-Paragraph 45
-Subparagraph e
-Clause 1
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141R
-Paragraph 34
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Segment Information (Segment Information Of Revenues, Gross Profit And Operating Income) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 30, 2012	Apr. 01, 2011
Segment Reporting Information [Line Items]
Revenues from external customers	$ 744.4	$ 870.6
Segment gross profit	257.2	258.6
Segment operating income (loss)	67.1	71.7
Computing & Consumer Group [Member]
Segment Reporting Information [Line Items]
Revenues from external customers	138.3	155.7
Segment gross profit	52.5	63.7
Segment operating income (loss)	20.9	27.4
Automotive, Industrial, Medical And Mil-Aero [Member]
Segment Reporting Information [Line Items]
Revenues from external customers	203.4	208.7
Segment gross profit	91.3	104.3
Segment operating income (loss)	19.7	32.5
Standard Products Group [Member]
Segment Reporting Information [Line Items]
Revenues from external customers	196.8	228.1
Segment gross profit	73.5	86.2
Segment operating income (loss)	46.9	54.6
SANYO Semiconductor Products Group [Member]
Segment Reporting Information [Line Items]
Revenues from external customers	205.9	278.1
Segment gross profit	39.9	4.4
Segment operating income (loss)	$ (20.4)	$ (42.8)

Fair Value Of Financial Instruments (Carrying Amounts And Fair Values Of Long-Term Borrowings) (Details) - USD ($) $ in Millions	Mar. 30, 2012	Dec. 31, 2011
Convertible Notes Payable [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying Amount	$ 574.3	$ 567.1
Fair Value	716.5	683.9
Long-term Debt [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying Amount	483.9	496.6
Fair Value	$ 453.3	$ 462.0

Financial Instruments (Tables)

3 Months Ended

Mar. 30, 2012

Financial Instruments [Abstract]

Schedule Of Net Foreign Exchange Positions


	March 30, 2012					December 31, 2011
	Buy (Sell)			Notional Amount		Buy (Sell)			Notional Amount
Chinese Renminbi	$	(8.4	)	$	8.4	$	(12.8	)	$	12.8
Euro		(38.2	)		38.2		(30.8	)		30.8
Japanese Yen		(68.5	)		68.5		(100.0	)		100.0
Malaysian Ringgit		29.4			29.4		29.4			29.4
Other Currencies		6.9			25.7		7.6			30.4

	$	(78.8	)	$	170.2	$	(106.6	)	$	203.4

Earnings Per Share And Equity

3 Months Ended

Mar. 30, 2012

Earnings Per Share And Equity [Abstract]

Earnings Per Share And Equity

Note 7: Earnings Per Share and Equity

Earnings Per Share

Calculations of net income per common share attributable to ON Semiconductor are as follows (in millions, except per share data):


	Quarter Ended
	March 30, 2012		April 1, 2011
Net income applicable to ON Semiconductor Corporation	$	28.2	$	35.5

Basic weighted average common shares outstanding		452.5		441.4
Add: Incremental shares for:
Dilutive effect of stock options and awards		5.1		10.8
Dilutive effect of convertible notes		3.0		3.8

Diluted weighted average common shares outstanding		460.6		456.0

Net income per common share attributable to ON Semiconductor Corporation
Basic:	$	0.06	$	0.08

Diluted:	$	0.06	$	0.08

Basic income per common share is computed by dividing net income attributable to ON Semiconductor by the weighted average number of common shares outstanding during the period.

The number of incremental shares from the assumed exercise of stock options and assumed issuance of restricted stock units is calculated by applying the treasury stock method. Common shares related to the employee stock options where the exercise price exceeded the average market price of the Company's common shares for the period have been anti-dilutive and were excluded from the diluted net income per share calculation. The excluded option shares were 11.3 million and 6.1 million for the quarters ended March 30, 2012 and April 1, 2011, respectively.

The incremental shares related to the Company's Zero Coupon Convertible Senior Subordinated Notes due 2024, 2.625% Convertible Senior Subordinated Notes due 2026 (including Series B notes), and the 1.875% Convertible Senior Subordinated Notes due 2025 (collectively, the "Convertible Notes") is determined in accordance with the net share settlement requirements prescribed by ASC Topic 260, Earnings Per Share ("ASC 260"). Under the net share settlement calculation, the Convertible Notes are assumed to be convertible into cash up to the par value, with the excess of par value being convertible into common stock. The dilutive effect occurs when the stock price exceeds the conversion price for each of the Convertible Notes, as of the end of the period, or as described in ASC 260, for year-to-date calculations. In periods when the share price is lower than the conversion price, the impact is anti-dilutive and therefore has no impact on the Company's earnings per share calculations.

Equity

Treasury stock is recorded at cost and is presented as a reduction of stockholders' equity in the accompanying consolidated financial statements. Shares withheld upon the vesting of restricted stock units to pay applicable employee withholding taxes are considered common stock repurchases. Upon vesting, the Company currently does not collect the applicable employee withholding taxes from employees. Instead, the Company automatically withholds, from the restricted stock units that vest, the portion of those shares with a fair market value equal to the amount of the employee withholding taxes due, which is accounted for as a repurchase of common stock. The Company then pays the applicable withholding taxes in cash. The amounts remitted in the quarter ended March 30, 2012 were $5.3 million, for which the Company withheld 591,174 shares of common stock that were underlying the restricted stock units that vested. None of these shares had been reissued or retired as of March 30, 2012, but may be reissued or retired by the Company at a later date.

At December 31, 2011, the minority interest balance was $25.3 million. This balance was increased to $26.1 million at March 30, 2012 due to the minority interest's $0.8 million share of the earnings for the quarter.

At December 31, 2010, the minority interest balance was $22.0 million. This balance increased to $22.7 million at April 1, 2011 due to the minority interest's $0.7 million share of the earnings for the quarter.

Balance Sheet Information (Narrative) (Details) - USD ($) $ in Millions	Mar. 30, 2012	Dec. 31, 2011	Apr. 01, 2011
Balance Sheet Information [Line Items]
Accrued pension liability underfunded plans	$ 67.5	$ 83.3
Accrued pension liability accrued expenses	9.8	11.4
Pension asset overfunded plans	12.5	12.4
Foreign currency translation gains related to Aizu facility	(41.6)	(46.5)
Acquisition Of SANYO Semiconductor Co., Ltd. [Member]
Balance Sheet Information [Line Items]
Accrued pension liability accrued expenses	2.9		$ 2.9
Defined benefit pension plan, liabilities	140.1	151.0
Restructuring Activities Related To 2011 Aizu Closure [Member]
Balance Sheet Information [Line Items]
Foreign currency translation gains related to Aizu facility	$ 18.9	$ 18.5

- Definition

Accumulated adjustment, net of tax, that results from the process of translating subsidiary financial statements and foreign equity investments into the reporting currency from the functional currency of the reporting entity, net of reclassification of realized foreign currency translation gains or losses.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Principles Board Opinion (APB)
-Number 12
-Paragraph 10
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 130
-Paragraph 17, 18, 19, 22, 23, 24, 25, 26
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 133
-Paragraph 45
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 52
-Paragraph 12, 13
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 52
-Paragraph 31
-Subparagraph a
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+ Details

- Definition

This represents the entire liability recognized in the balance sheet that is associated with the defined benefit pension plans.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
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-Subparagraph c
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-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
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+ Details

Subsequent Events (Narrative) (Details) $ in Millions	3 Months Ended
Subsequent Events (Narrative) (Details) $ in Millions	Mar. 30, 2012 USD ($) employee	Apr. 16, 2012 USD ($)
Zero Coupon Convertible Senior Subordinated Notes Due 2024 [Member]
Subsequent Event [Line Items]
Debt instrument, interest rate	0.00%	0.00%
Debt instrument, maturity year	2024
Gross principal amount paid to note holders		$ 96.2
Restructuring Activities Related To The 2011 SANYO Semiconductor Acquisition [Member]
Subsequent Event [Line Items]
Expected reduction in employment levels \| employee	500
Maximum [Member] \| Restructuring Activities Related To The 2011 SANYO Semiconductor Acquisition [Member]
Subsequent Event [Line Items]
Estimated additional voluntary retirement charges	$ 50.0
Minimum [Member] \| Restructuring Activities Related To The 2011 SANYO Semiconductor Acquisition [Member]
Subsequent Event [Line Items]
Estimated additional voluntary retirement charges	$ 40.0

Segment Information (Summary Of Property, Plant And Equipment By Geographic Location) (Details) - USD ($) $ in Millions	Mar. 30, 2012	Dec. 31, 2011
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment, net	$ 1,155.5	$ 1,109.5
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment, net	261.0	257.5
China [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment, net	94.5	96.7
Other Europe [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment, net	129.0	117.9
Malaysia [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment, net	172.6	164.5
Other Asia/Pacific [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment, net	82.4	56.2
Japan [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment, net	125.3	130.2
Belgium [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment, net	68.4	70.0
Other Americas [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment, net	12.7	12.5
Philippines [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment, net	$ 209.6	$ 204.0