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Document and Entity Information - shares	3 Months Ended
Document and Entity Information - shares	Mar. 30, 2018	Apr. 25, 2018
Document And Entity Information [Abstract]
Entity Registrant Name	ON Semiconductor Corporation
Entity Central Index Key	0001097864
Current Fiscal Year End	--12-31
Entity Filer Category	Large Accelerated Filer
Document Type	10-Q
Document Period End Date	Mar. 30, 2018
Document Fiscal Period Focus	Q1
Document Fiscal Year Focus	2018
Amendment Flag	false
Entity Common Stock, Shares Outstanding		427,562,866

Consolidated Balance Sheets - USD ($) $ in Millions	Mar. 30, 2018	Dec. 31, 2017
Assets
Cash and cash equivalents	$ 924.9	$ 949.2
Receivables, net	696.9	701.5
Inventories	1,160.0	1,089.5
Other current assets	185.2	193.0
Total current assets	2,967.0	2,933.2
Property, plant and equipment, net	2,336.4	2,279.1
Goodwill	916.9	916.9
Intangible assets, net	600.9	628.3
Deferred tax assets	333.3	339.1
Other assets	108.6	98.5
Total assets	7,263.1	7,195.1
Liabilities, Non-Controlling Interest and Stockholders’ Equity
Accounts payable	612.0	548.0
Accrued expenses	585.8	612.8
Current portion of long-term debt	747.2	248.1
Total current liabilities	1,945.0	1,408.9
Long-term debt	2,084.4	2,703.7
Deferred tax liabilities	57.1	55.1
Other long-term liabilities	225.1	226.4
Total liabilities	4,311.6	4,394.1
Commitments and contingencies
ON Semiconductor Corporation stockholders’ equity:
Common stock ($0.01 par value, 1,250,000,000 and 1,250,000,000 shares authorized, 554,961,297 and 551,873,115 issued, 427,459,255 and 425,118,194 outstanding, respectively)	5.5	5.5
Additional paid-in capital	3,615.5	3,593.5
Accumulated other comprehensive loss	(34.4)	(40.6)
Accumulated earnings	491.7	351.5
Less: Treasury stock, at cost: 127,502,042 and 126,754,921 shares, respectively	(1,149.9)	(1,131.1)
Total ON Semiconductor Corporation stockholders’ equity	2,928.4	2,778.8
Non-controlling interest in consolidated subsidiary	23.1	22.2
Total stockholders' equity	2,951.5	2,801.0
Total liabilities and stockholders' equity	$ 7,263.1	$ 7,195.1

Consolidated Balance Sheets (Parenthetical) - $ / shares	Mar. 30, 2018	Dec. 31, 2017
Stockholders' Equity:
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	1,250,000,000	1,250,000,000
Common stock, shares issued (in shares)	554,961,297	551,873,115
Common stock, shares outstanding (in shares)	427,459,255	425,118,194
Treasury stock, shares (in shares)	127,502,042	126,754,921

Consolidated Statements of Operations and Comprehensive Income - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 30, 2018	Mar. 31, 2017
Income Statement [Abstract]
Revenues	$ 1,377.6	$ 1,436.7
Cost of revenues (exclusive of amortization shown below)	860.2	933.6
Gross profit	517.4	503.1
Operating expenses:
Research and development	155.2	140.1
Selling and marketing	77.8	77.5
General and administrative	70.9	68.4
Amortization of acquisition-related intangible assets	27.4	29.1
Restructuring, asset impairments and other, net	0.4	0.5
Intangible asset impairment	0.0	4.4
Total operating expenses	331.7	320.0
Operating income	185.7	183.1
Other (expense) income, net:
Interest expense	(31.5)	(38.4)
Interest income	0.9	0.6
Loss on debt refinancing and prepayment	0.0	(26.2)
Licensing income	3.8	0.0
Other expense	(2.0)	(4.1)
Other (expense) income, net	(28.8)	(68.1)
Income before income taxes	156.9	115.0
Income tax provision	(16.4)	(36.3)
Net income	140.5	78.7
Less: Net income attributable to non-controlling interest	(0.9)	(0.5)
Net income attributable to ON Semiconductor Corporation	139.6	78.2
Comprehensive income, net of tax:
Net income	140.5	78.7
Foreign currency translation adjustments	2.4	6.3
Effects of cash flow hedges	3.8	0.8
Other comprehensive income, net of tax of $1.0 and $0.6, respectively	6.2	7.1
Comprehensive income	146.7	85.8
Comprehensive income attributable to non-controlling interest	(0.9)	(0.5)
Comprehensive income attributable to ON Semiconductor Corporation	$ 145.8	$ 85.3
Net income per common share attributable to ON Semiconductor Corporation:
Basic (in dollars per share)	$ 0.33	$ 0.19
Diluted (in dollars per share)	$ 0.31	$ 0.18
Weighted-average common shares outstanding:
Basic (in shares)	425.9	419.8
Diluted (in shares)	444.2	425.8

Consolidated Statements of Operations and Comprehensive Income Consolidated Statements of Operations and Comprehensive Income (Parenthetical) - USD ($) $ in Millions	3 Months Ended
	Mar. 30, 2018	Mar. 31, 2017
Income Statement [Abstract]
Other comprehensive income (loss), tax	$ 1.0	$ 0.6

Consolidated Statements of Cash Flows - USD ($) $ in Millions	3 Months Ended
	Mar. 30, 2018	Mar. 31, 2017
Cash flows from operating activities:
Net income	$ 140.5	$ 78.7
Adjustments to reconcile net income to net cash provided by operating activities and other adjustments:
Depreciation and amortization	119.9	114.3
Loss on sale or disposal of fixed assets	1.3	2.9
Loss on debt refinancing and prepayment	0.0	26.2
Amortization of debt discount and issuance costs	3.3	4.5
Payments for term debt modification	0.0	(2.4)
Write-down of excess inventories	9.4	14.2
Non-cash share-based compensation expense	18.4	15.1
Non-cash interest on convertible notes	8.7	4.7
Non-cash intangible asset impairment charges	0.0	4.4
Change in deferred taxes	7.5	36.2
Other	(1.2)	1.5
Changes in assets and liabilities:
Receivables	(24.4)	(45.2)
Inventories	(73.3)	4.9
Other assets	(1.4)	(17.7)
Accounts payable	24.4	9.2
Accrued expenses	(9.5)	63.1
Deferred income on sales to distributors	0.0	(107.3)
Other long-term liabilities	2.9	1.2
Net cash provided by operating activities	226.5	208.5
Cash flows from investing activities:
Purchases of property, plant and equipment	(99.5)	(52.7)
Proceeds from sales of property, plant and equipment	5.6	0.2
Deposits made for purchases of property, plant and equipment	(11.6)	(0.2)
Purchase of businesses, net of cash acquired	0.0	(0.8)
Purchases of held-to-maturity securities	0.0	(1.6)
Net cash used in investing activities	(105.5)	(55.1)
Cash flows from financing activities:
Proceeds from issuance of common stock under the ESPP	0.0	5.9
Proceeds from exercise of stock options	3.6	7.5
Payments of tax withholding for restricted shares	(18.8)	(13.0)
Repurchase of common stock	0.0	(25.0)
Proceeds from debt issuance	5.3	689.0
Repayment of long-term debt	(135.9)	(1,054.4)
Purchase of convertible note hedges	0.0	(144.7)
Proceeds from issuance of warrants	0.0	85.2
Payment of capital lease obligations	(1.1)	(5.4)
Net cash used in financing activities	(146.9)	(454.9)
Effect of exchange rate changes on cash, cash equivalents and restricted cash	1.6	2.3
Net decrease in cash, cash equivalents and restricted cash	(24.3)	(299.2)
Cash, cash equivalents and restricted cash, beginning of period	966.6	1,045.8
Cash, cash equivalents and restricted cash, end of period	$ 942.3	$ 746.6

Background and Basis of Presentation	3 Months Ended
Background and Basis of Presentation	Mar. 30, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Background and Basis of Presentation	Note 1: Background and Basis of Presentation ON Semiconductor Corporation, together with its wholly-owned and majority-owned subsidiaries ("ON Semiconductor" or the "Company"), uses a thirteen-week fiscal quarter accounting period for the first three fiscal quarters of each year, with the first quarter of 2018 having ended on March 30, 2018, and each fiscal year ending on December 31. The quarters ended March 30, 2018 and March 31, 2017 contained 89 and 90 days, respectively. As of March 30, 2018, the Company was organized into the following three operating and reporting segments: Power Solutions Group, Analog Solutions Group and Image Sensor Group. Additional details on the Company’s reportable segments are included in Note 2: ''Revenue and Segment Information.'' The accompanying unaudited financial statements as of and for the quarter ended March 30, 2018 have been prepared in accordance with generally accepted accounting principles in the United States of America ("GAAP") for unaudited interim financial information. Accordingly, the unaudited financial statements do not include all of the information and footnotes required by GAAP for audited financial statements. The balance sheet as of December 31, 2017 was derived from the Company's audited financial statements but does not include all disclosures required by GAAP for audited financial statements. In the opinion of the Company's management, the interim information includes all adjustments, which includes 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, 2017 included in the Company's Annual Report on Form 10-K for the fiscal year ended December 31, 2017, filed with the SEC on February 21, 2018 (the “2017 Form 10-K”). Financial results for interim periods are not necessarily indicative of the results of operations that may be expected for a full fiscal year. Adoption of New Revenue Standard On January 1, 2018, as required, the Company adopted ASU No. 2014-09 - Revenue from Contracts with Customers (Topic 606) ("ASU 2014-09"), ASU No. 2015-14 - Revenue from Contracts with Customers (Topic 606): Deferral of the Effective Date ("ASU 2015-14"), ASU No. 2016-08 - Revenue from Contracts with Customers (Topic 606): Principal versus Agent Considerations ("ASU 2016-08"), ASU No. 2016-10 - Revenue from Contracts with Customers (Topic 606): Identifying Performance Obligations and Licensing ("ASU 2016-10"), ASU No. 2016-12 - Revenue from Contracts with Customers (Topic 606): Narrow-Scope Improvements and Practical Expedients ("ASU 2016-12") and ASU No. 2016-20 - Technical Corrections and Improvements to Topic 606, Revenue from Contracts with Customers” ("ASU 2016-20") (collectively “the New Revenue Standard”). To conform to the New Revenue Standard, the Company modified its revenue recognition policy as described below. See Note 3: ''Recent Accounting Pronouncements'' for more information. Change in Accounting Policy On January 1, 2018, the Company adopted the New Revenue Standard using the modified retrospective method, applying the guidance to all open contracts and recognized the cumulative effect adjustment of $2.1 million to retained earnings and accrued expenses as of that date. The comparative financial information has not been restated and continues to be presented under the accounting standards in effect for the respective periods. The Company applied the practical expedient and has not disclosed the revenue allocated to future shipments of partially completed contracts. Substantially all of the Company’s revenue continues to be recognized following the transfer of control of the products to the customer, which typically occurs upon shipment or delivery depending on the terms of the underlying contracts. Under the New Revenue Standard, revenue from certain product development agreements which were previously deferred as delivered, are now recognized over time. During the quarter ended March 30, 2018, revenue increased by $1.8 million due to the impact of the adoption of the New Revenue Standard. Revenue Recognition Policy In anticipation of the adoption of the New Revenue Standard, during the quarter ended March 31, 2017, the Company developed its internal systems, processes and controls to enable it to make the estimates required by the New Revenue Standard on sales to its distributors, and was able to reliably estimate upfront the effects of returns and allowances and record revenues at the time of sales to these distributors. As a result of this change, the Company recognized an additional $155.1 million in revenue during the first quarter of 2017, which resulted in an increase of $59.0 million to income before income taxes. The Company generates revenue from sales of its semiconductor products to OEMs, electronic manufacturing service providers and distributors. The Company also generates revenue, to a much lesser extent, from product development agreements and manufacturing services provided to customers. The Company recognizes revenue when it satisfies a performance obligation in an amount reflecting the consideration to which it expects to be entitled. For sales agreements, the Company has identified the promise to transfer products, each of which are distinct, to be the performance obligation. For product development agreements, the Company has identified the completion of a service defined in the agreement to be the performance obligation. The Company applies a five-step approach in determining the amount and timing of revenue to be recognized: (1) identifying the contract with a customer, (2) identifying the performance obligations in the contract, (3) determining the transaction price, (4) allocating the transaction price to the performance obligations in the contract and (5) recognizing revenue when the performance obligation is satisfied. Substantially all of the Company’s revenue is recognized at the time control of the products transfers to the customer. Sales agreements with customers are renewable periodically and contain terms and conditions with respect to payment, delivery, warranty and supply, but typically do not require minimum purchase commitments. In the absence of a sales agreement, the Company’s standard terms and conditions apply. The Company considers the customer purchase orders, governed by sales agreements or the Company’s standard terms and conditions, to be the contract with the customer. The Company evaluates certain factors including the customer’s ability to pay (or credit risk). Most of the Company’s OEM customers negotiate pricing terms on an annual basis, while the electronic manufacturer service providers and distributors generally negotiate pricing terms on a quarterly basis. Pricing terms on product development agreements are negotiated at the beginning of a project. The Company allocates the transaction price to each distinct product based on its relative stand-alone selling price. In determining the transaction price, the Company evaluates whether the price is subject to refund or adjustment to determine the net consideration to which the Company expects to be entitled. The Company’s OEM customers do not have the right to return products, other than pursuant to the provisions of the Company’s standard warranty. Sales to distributors, however, are typically made pursuant to agreements that provide return rights with respect to discontinued or slow-moving products, referred to as stock rotation. Sales to distributors can also be subject to price adjustment on certain products, primarily for distributors with ship and credit rights. Although payment terms vary, most distributor agreements require payment within 30 days. In addition, the Company offers cash discounts to certain customers for payments received within an agreed upon time, generally ten days after shipment. The Company recognizes revenue when it satisfies a performance obligation. The Company recognizes revenue from sales agreements upon transferring control of a product to the customer. This typically occurs when products are shipped or delivered, depending on the delivery terms, or when products that are consigned at customer locations are consumed. The Company recognizes revenue from product development agreements over time based on the cost-to-cost method. Revenue recognized during the quarter ended March 30, 2018 for sales agreements was $1,372.8 million and for product development agreements was $4.8 million. Sales returns and allowances are estimated based on historical experience. Provisions for discounts and rebates to customers, estimated returns and allowances, ship and credit claims and other adjustments are provided for in the same period the related revenues are recognized, and are netted against revenues. For returns, the Company recognizes a related asset for the right to recover returned products with a corresponding reduction to cost of goods sold. The Company reviews warranty and related claims activity and records provisions, as necessary. The Company records a reserve for cash discounts as a reduction to accounts receivable and a reduction to revenues, based on the experience with each customer. Frequently, the Company receives orders with multiple delivery dates that may extend across reporting periods. Since each delivery constitutes a performance obligation, the Company allocates the transaction price of the contract to each performance obligation based on the stand-alone selling price of the products. The Company invoices the customer for each delivery upon shipment and recognizes revenues in accordance with delivery terms. As scheduled delivery dates are within one year, revenue allocated to future shipments of partially completed contracts are not disclosed. The Company has elected to record freight and handling costs associated with outbound freight after control over a product has transferred to a customer as a fulfillment cost and include it in cost of revenues. Taxes assessed by government authorities on revenue-producing transactions, including value-added and excise taxes, are presented on a net basis (excluded from revenues) in the Consolidated Statements of Operations and Comprehensive Income. The Company generally warrants that products sold to its customers will, at the time of shipment, be free from defects in workmanship and materials and conform to specifications. The Company’s standard warranty extends for a period of two years from the date of delivery, except in the case of Image Sensor products, which are warrantied for one year from the date of delivery. At the time revenue is recognized, the Company establishes an accrual for estimated warranty expenses associated with its sales, and records them as a component of the cost of revenues Use of Estimates The preparation of financial statements in accordance with GAAP 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. Management evaluates these estimates and judgments on an ongoing basis and bases its estimates on experience, current and expected future conditions, third-party evaluations and various other assumptions that management believes are reasonable under the circumstances. Significant estimates have been used by management in conjunction with the following: (i) estimates of future payouts for customer incentives and estimates of amounts subject to allowances, returns and warranties; (ii) measurement of valuation allowances relating to inventories and trade receivables; (iii) future cash flows used to assess and test for impairment of goodwill and indefinite-lived intangible assets and long-lived assets, if applicable; (iv) assumptions surrounding future pension obligations; (v) fair values of share-based compensation and of financial instruments (including derivative financial instruments); (vi) measurement of valuation allowances against deferred tax assets, evaluations of uncertain tax positions and the impact of U.S. tax reform; and (vii) estimates and assumptions used in connection with business combinations. Actual results may differ from the estimates and assumptions used in the consolidated financial statements and related notes. Foreign Currencies Most of the Company’s foreign subsidiaries conduct business primarily in U.S. dollars and, as a result, utilize the dollar as their functional currency. For the remeasurement of financial statements of these subsidiaries, assets and liabilities in foreign currencies that are receivable or payable in cash are remeasured at current exchange rates, while inventories and other non-monetary assets in foreign currencies are remeasured at historical rates. Gains and losses resulting from the remeasurement of such financial statements are included in the operating results, as are gains and losses incurred on foreign currency transactions. Historically, the majority of the Company’s Japanese subsidiaries utilized Japanese Yen as their functional currency. The assets and liabilities of these subsidiaries are translated at current exchange rates, while revenues and expenses are translated at the average rates in effect for the period. The related translation gains and losses are included in other comprehensive income or loss within the Consolidated Statements of Operations and Comprehensive Income. As a result of an analysis which took into account the economic indicators of these subsidiaries from a long-term perspective, the Company changed the functional currency for some of these subsidiaries from Japanese Yen to U.S. dollars from January 1, 2018.

Revenue and Segment Information

3 Months Ended

Mar. 30, 2018

Segment Reporting [Abstract]

Segment Information

The Company is organized into three reportable segments consisting of the Power Solutions Group, the Analog Solutions Group and the Image Sensor Group. Each of the Company’s major product lines has been examined and assigned to a reportable segment 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 and allocation of resources.

The following table disaggregates the Company’s segment revenue into geographic locations and sales channels (in millions):



	Reportable Segments
	Quarter Ended March 30, 2018
	Power Solutions Group		Analog Solutions Group		Image Sensor Group		Total
Geographic Location
United States	$	94.5	$	78.2	$	26.5	$	199.2
United Kingdom	118.6		79.1		35.9		233.6
Hong Kong	205.2		122.5		33.2		360.9
Singapore	228.4		161.2		43.3		432.9
Other	45.9		55.2		49.9		151.0
Total	$	692.6	$	496.2	$	188.8	$	1,377.6

Sales Channel
OEM	$	198.1	$	207.6	$	64.5	$	470.2
Distributor	452.6		254.1		114.9		821.6
Electronic Manufacturing Service Provider	41.9		34.5		9.4		85.8
Total	$	692.6	$	496.2	$	188.8	$	1,377.6

Revenues and gross profit for the Company’s reportable segments were as follows (in millions):



	Power Solutions Group		Analog Solutions Group		Image Sensor Group		Total
For the quarter ended March 30, 2018:
Revenues from external customers	$	692.6	$	496.2	$	188.8	$	1,377.6
Gross profit	$	239.2	$	206.8	$	81.7	$	527.7
For the quarter ended March 31, 2017:
Revenues from external customers	$	743.8	$	503.6	$	189.3	$	1,436.7
Gross profit	$	244.0	$	209.3	$	67.4	$	520.7

Gross profit shown above and below is exclusive of the amortization of acquisition-related intangible assets. Reconciliations of segment gross profit to consolidated gross profit are as follows (in millions):



	Quarter Ended
	March 30, 2018			March 31, 2017
Gross profit for reportable segments	$	527.7		$	520.7
Less: unallocated manufacturing costs	(10.3		)	(17.6		)
Consolidated gross profit	$	517.4		$	503.1

The Company’s consolidated assets are not specifically ascribed to its individual reporting segments. Rather, assets used in operations are generally shared across the Company’s reporting segments.

The Company operates in various geographic locations. Sales to unaffiliated customers have little correlation with the location of manufacturers. It is, therefore, not meaningful to present operating profit by geographical location.

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



	As of
	March 30, 2018		December 31, 2017
United States	$	546.9	$	547.9
Korea	392.8		380.5
Malaysia	229.1		230.0
Philippines	456.0		439.5
China	255.1		246.0
Other	456.5		435.2
	$	2,336.4	$	2,279.1

For the quarters ended March 30, 2018 and March 31, 2017, no single customer, including any distributor, accounted for 10% or more of the Company's total consolidated revenues.

Recent Accounting Pronouncements	3 Months Ended
Recent Accounting Pronouncements	Mar. 30, 2018
Accounting Changes and Error Corrections [Abstract]
Recent Accounting Pronouncements	Note 3: Recent Accounting Pronouncements ASUs Adopted: New Revenue Standard The Company adopted the New Revenue Standard on a modified retrospective basis on January 1, 2018. The cumulative-effect adjustment related to the timing of revenue recognition on certain product development agreements recorded to beginning retained earnings as of January 1, 2018 was $2.1 million. The Company expects the ongoing impact of the New Revenue Standard to be immaterial to the consolidated financial statements. ASU No. 2017-09 - Scope of Modification Accounting ("ASU 2017-09") In May 2017, the FASB issued ASU No. 2017-09 to reduce diversity in practice and provide clarity regarding existing guidance in ASC 718, “Stock Compensation.” The amendments clarify that an entity should apply modification accounting in response to a change in the terms and conditions of an entity’s share-based payment awards unless three newly specified criteria are met. The amendments are effective for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years. The Company adopted ASU 2017-09 during the first quarter of 2018. The adoption of this standard did not have a material impact on the consolidated financial statements. ASU No 2017-07 - Compensation-Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost ("ASU 2017-07") In March 2017, the FASB issued ASU 2017-07 primarily to improve the presentation of net periodic pension cost and net periodic postretirement benefit cost. The guidance will require the net benefit cost to be split in the income statement. The service cost component will be included in operating income. The other components, including amortization of past service costs or credits, and settlement and curtailments amounts, will be reported separately outside of operating income. The amendment is effective for fiscal years beginning after December 15, 2017. The Company adopted ASU 2017-07 during the first quarter of 2018, applying the standard retrospectively to all periods presented. The adoption of this standard did not have a material impact on the current period or prior period consolidated financial statements. See Note 6: ''Balance Sheet Information'' for further information on the adoption of ASU 2017-07. ASU No. 2016-18 - Statement of Cash Flows (Topic 230): Restricted Cash (a consensus of the FASB Emerging Issues Task Force) ("ASU 2016-18") In November 2016, the FASB issued ASU 2016-18, which requires entities to include in their cash and cash-equivalent balances in the statement of cash flows those amounts that are deemed to be restricted cash and restricted cash equivalents. The ASU does not define the terms “restricted cash” and “restricted cash equivalents.” The amendments are effective for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years. The Company adopted ASU 2016-18 during the first quarter of 2018, applying the standard retrospectively to all periods presented. The adoption of this standard did not have a material impact on the current period or prior period consolidated financial statements. See Note 15: ''Supplemental Disclosures'' for further information on the adoption of ASU 2016-18. ASU No. 2016-16 - Income Taxes (Topic 740): Intra-Entity Transfers of Assets Other Than Inventory ("ASU 2016-16") In October 2016, the FASB issued ASU 2016-16, which eliminates the exception for all intra-entity sales of assets other than inventory. As a result, a reporting entity would recognize the tax expense from the sale of the asset in the seller’s tax jurisdiction when the transfer occurs, even though the pre-tax effects of that transaction are eliminated in consolidation. Any deferred tax asset that arises in the buyer’s jurisdiction would also be recognized at the time of the transfer. The new guidance does not apply to intra-entity transfers of inventory. The income tax consequences from the sale of inventory from one member of a consolidated entity to another will continue to be deferred until the inventory is sold to a third party. The amendments are effective for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years. The Company adopted ASU 2016-16 during the first quarter of 2018. The adoption of this standard did not have a material impact on the consolidated financial statements. ASU No. 2016-15 - Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments ("ASU 2016-15") In August 2016, the FASB issued ASU 2016-15, which changes how certain cash receipts and cash payments are presented and classified in the statement of cash flows. The amendments are effective for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years. The Company adopted ASU 2016-15 during the first quarter of 2018. The adoption of this standard did not have a material impact on the consolidated financial statements. ASUs Pending Adoption: ASU No. 2017-12 - Derivatives and Hedging (topic 815): Targeted Improvements to Accounting for Hedging Activities ("ASU 2017-12") In August 2017, the FASB issued ASU No. 2017-12 to better align hedge accounting with risk management strategies, and as a result, more hedging strategies will be eligible for hedge accounting. Public business entities will have until the end of the first quarter in which a hedge is designated to perform an initial assessment of a hedge’s effectiveness. After initial qualification, the new guidance permits a qualitative effectiveness assessment for certain hedges instead of a quantitative test if the company can reasonably support an expectation of high effectiveness throughout the term of the hedge. An initial quantitative test to establish that the hedge relationship is highly effective is still required. The amendments are effective for fiscal years beginning after December 15, 2018. Early adoption is permitted. The Company does not anticipate the adoption of ASU 2017-12 will have a material impact on its consolidated financial statements. ASU No. 2016-02 - Leases (Topic 842) ("ASU 2016-02") In February 2016, the FASB issued ASU 2016-02, which amends the accounting treatment for leases. Lessees (for capital and operating leases) and lessors (for sales-type leases, direct financing leases, and operating leases) must apply a modified retrospective transition approach for leases existing at, or entered into after, the beginning of the earliest comparative period presented in the financial statements. The modified retrospective approach would not require any transition accounting for leases that expired before the earliest comparative period presented. Lessees and lessors may not apply a full retrospective transition approach. The amendments are effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. Early adoption is permitted. The Company expects the adoption of this standard will result in a significant component of the Company's future minimum lease obligations as disclosed in Note 10: ''Commitments and Contingencies'' to be included on its Consolidated Balance Sheets. The Company is currently reviewing its service agreements and other arrangements to evaluate whether they meet the definition of a lease under ASU 2016-02 and what additional impact that the adoption of ASU 2016-02 may have on its consolidated financial statements.

Goodwill and Intangible Assets

3 Months Ended

Mar. 30, 2018

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill and Intangible Assets

Note 4: Goodwill and Intangible Assets

Goodwill

The following table summarizes goodwill by reportable segment (in millions):



	As of March 30, 2018							As of December 31, 2017
	Goodwill		Accumulated Impairment Losses			Carrying Value		Goodwill		Accumulated Impairment Losses			Carrying Value
Reportable Segment:
Power Solutions Group	$	432.2	$	(28.6	)	$	403.6	$	432.2	$	(28.6	)	$	403.6
Analog Solutions Group	836.7		(418.9		)	417.8		836.7		(418.9		)	417.8
Image Sensor Group	95.5		—			95.5		95.5		—			95.5
	$	1,364.4	$	(447.5	)	$	916.9	$	1,364.4	$	(447.5	)	$	916.9

There was no change in the balance of goodwill between December 31, 2017 and March 30, 2018.

Goodwill is tested for impairment annually on the first day of the fourth quarter or more frequently if events or changes in circumstances (each, a "triggering event") would more likely than not reduce the carrying value of goodwill below its fair value. Management did not identify any triggering events through March 30, 2018 that would require an interim impairment analysis.

Intangible Assets

Intangible assets, net, were as follows (in millions):



	As of March 30, 2018
	Original Cost		Accumulated Amortization			Accumulated Impairment Losses			Carrying Value
Intellectual property	$	13.9	$	(12.0	)	$	(0.4	)	$	1.5
Customer relationships	555.9		(336.1		)	(20.1		)	199.7
Patents	43.7		(27.1		)	(13.7		)	2.9
Developed technology	657.6		(297.2		)	(2.6		)	357.8
Trademarks	17.2		(12.6		)	(1.1		)	3.5
Backlog	3.3		(3.3		)	—			—
Favorable Leases	1.7		(1.7		)	—			—
IPRD	54.5		—			(19.0		)	35.5
Total intangibles	$	1,347.8	$	(690.0	)	$	(56.9	)	$	600.9



	As of December 31, 2017
	Original Cost		Accumulated Amortization			Accumulated Impairment Losses			Carrying Value
Intellectual property	$	13.9	$	(11.8	)	$	(0.4	)	$	1.7
Customer relationships	555.9		(328.5		)	(20.1		)	207.3
Patents	43.7		(26.8		)	(13.7		)	3.2
Developed technology	657.6		(278.2		)	(2.6		)	376.8
Trademarks	17.2		(12.4		)	(1.1		)	3.7
Backlog	3.3		(3.3		)	—			—
Favorable Leases	1.7		(1.6		)	—			0.1
IPRD	54.5		—			(19.0		)	35.5
Total intangibles	$	1,347.8	$	(662.6	)	$	(56.9	)	$	628.3

Amortization expense for acquisition-related intangible assets amounted to $27.4 million and $29.1 million for the quarters ended March 30, 2018 and March 31, 2017, respectively. Amortization expense for intangible assets, with the exception of the $35.5 million of IPRD assets that will be amortized once the corresponding projects have been completed, is expected to be as follows for remainder of 2018, each of the next four years, and thereafter (in millions):



Period	Amortization Expense
Remainder of 2018	$	81.7
2019	99.8
2020	84.9
2021	70.0
2022	57.9
Thereafter	171.1
Total amortization expense	$	565.4

- 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

Restructuring, Asset Impairments and Other, Net

3 Months Ended

Mar. 30, 2018

Restructuring Charges [Abstract]

Restructuring, Asset Impairments and Other, Net

Note 5: Restructuring, Asset Impairments and Other, Net

Summarized activity included in the “Restructuring, asset impairments and other, net” caption on the Company's Consolidated Statements of Operations and Comprehensive Income is as follows (in millions):



	Restructuring		Asset Impairments		Other ⁽¹⁾		Total
Quarter ended March 30, 2018
Other	—		—		0.4		0.4
Total	$	—	$	—	$	0.4	$	0.4

⁽¹⁾ Includes amounts related to immaterial adjustments which are not considered to be significant.

A summary of changes in accrued restructuring charges are as follows (in millions):



	As of December 31, 2017		Charges		Usage			As of March 30, 2018
Employee separation charges	$	1.9	$	0.4	$	(1.2	)	$	1.1
Costs to exit	0.2		—		—			0.2
Total	$	2.1	$	0.4	$	(1.2	)	$	1.3

Balance Sheet Information

3 Months Ended

Mar. 30, 2018

Balance Sheet Related Disclosures [Abstract]

Balance Sheet Information

Note 6: Balance Sheet Information

Certain significant amounts included in the Company's Consolidated Balance Sheets consist of the following (in millions):



	As of
	March 30, 2018			December 31, 2017
Receivables, net:
Accounts receivable	$	700.3		$	704.2
Less: Allowance for doubtful accounts	(3.4		)	(2.7		)
	$	696.9		$	701.5
Inventories:
Raw materials	$	119.9		$	117.7
Work in process	711.9			660.8
Finished goods	328.2			311.0
	$	1,160.0		$	1,089.5
Property, plant and equipment, net:
Land	$	148.5		$	148.4
Buildings	751.7			744.0
Machinery and equipment	3,582.7			3,454.6
Total property, plant and equipment	4,482.9			4,347.0
Less: Accumulated depreciation	(2,146.5		)	(2,067.9		)
	$	2,336.4		$	2,279.1
Accrued expenses:
Accrued payroll and related benefits	$	174.3		$	201.8
Sales related reserves	284.4			280.0
Income taxes payable	13.6			29.9
Other	113.5			101.1
	$	585.8		$	612.8

Assets classified as held-for-sale, consisting of properties, are required to be recorded at the lower of carrying value or fair value less costs to sell. The carrying value of these assets as of March 30, 2018 and December 31, 2017 was $1.4 million and $5.3 million, respectively, and is reported as other current assets on the Company’s Consolidated Balance Sheets. The Company sold the assets held-for-sale at December 31, 2017 in January 2018 for $5.5 million.

Warranty Reserves

The activity related to the Company's warranty reserves was as follows (in millions):



	Quarter Ended
	March 30, 2018			March 31, 2017
Beginning Balance	$	8.0		$	8.8
Provision	(0.4		)	0.8
Usage	(0.2		)	(1.8		)
Ending Balance	$	7.4		$	7.8

Defined Benefit Plans

The Company maintains defined benefit plans for certain 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, 2018, the total accrued pension liability for underfunded plans was $115.0 million, of which the current portion of $0.3 million was classified as accrued expenses. As of December 31, 2017, the total accrued pension liability for underfunded plans was $109.3 million, of which the current portion of $0.2 million was classified as accrued expenses.

The components of the Company's net periodic pension expense are as follows (in millions):



	Quarter Ended
	March 30, 2018			March 31, 2017
Service cost	$	2.5		$	2.3
Interest cost	1.2			1.0
Expected return on plan assets	(1.6		)	(1.3		)
Total net periodic pension cost	$	2.1		$	2.0

With the retrospective adoption of ASU 2017-07, service cost component is included in operating income while the other components, including interest cost and expected return on plan assets, are reported separately outside of operating income. The Company utilized the practical expedient to estimate the amounts for the comparative periods using the information previously disclosed in the notes to the consolidated financial statements in the 2017 Form 10-K. The service cost is allocated between the cost of revenues, research and development, selling and marketing and general and administrative line items, while the other components are included in other expense in the Consolidated Statements of Operations and Comprehensive Income.

Long-Term Debt

3 Months Ended

Mar. 30, 2018

Debt Disclosure [Abstract]

Long-Term Debt

Note 7: Long-Term Debt

The Company's long-term debt consists of the following (annualized interest rates, in millions):



	As of
	March 30, 2018			December 31, 2017
Amended Credit Agreement:
Revolving Credit Facility due 2021, interest payable monthly at 3.38% and 3.07%, respectively	$	400.0		$	400.0
Term Loan “B” Facility due 2023, interest payable monthly at 3.88% and 3.57%, respectively	1,204.5			1,204.5
1.00% Notes due 2020 (1)	690.0			690.0
1.625% Notes due 2023 (2)	575.0			575.0
Note payable to SMBC due 2016 through 2018, interest payable quarterly at 0% and 3.09%, respectively (3)	—			122.7
U.S. real estate mortgages payable monthly through 2019 at an average rate of 3.12% and 3.12%, respectively (4)	33.1			34.2
Philippine term loans due 2017 through 2020, interest payable quarterly at 4.15% and 3.73%, respectively (7)	29.4			32.4
Loan with Singapore bank, interest payable weekly at 3.13% and 2.80%, respectively (6) (10)	25.0			25.0
Loan with Hong Kong bank, interest payable weekly at 3.13% and 2.78%, respectively (6) (10)	25.0			25.0
Malaysia revolving line of credit, interest payable quarterly at 3.76% and 3.14%, respectively (7) (10)	25.0			25.0
Vietnam revolving line of credit, interest payable quarterly at an average rate of 3.14% and 2.88%, respectively (7) (10)	22.5			24.9
Loan with Philippine bank due 2017 through 2019, interest payable quarterly at 4.78% and 4.20%, respectively (5)	8.2			9.4
Loan with Japanese bank due 2017 through 2020, interest payable quarterly at 1.10% (7)	2.6			2.7
Capital lease obligations	3.2			4.2
Gross long-term debt, including current maturities	3,043.5			3,175.0
Less: Debt discount (8)	(169.5		)	(178.8		)
Less: Debt issuance costs (9)	(42.4		)	(44.4		)
Net long-term debt, including current maturities	2,831.6			2,951.8
Less: Current maturities	(747.2		)	(248.1		)
Net long-term debt	2,084.4			2,703.7

_______________________


(1)	Interest is payable on June 1 and December 1 of each year at 1.00% annually.


(2)	Interest is payable on April 15 and October 15 of each year at 1.625% annually.


(3)	This loan represented SCI LLC's non-collateralized loan with SMBC, which was guaranteed by the Company.


(4)	Debt arrangement collateralized by real estate, including certain of the Company’s facilities in California, Oregon and Idaho.


(5)	Debt collateralized by equipment.


(6)	Debt arrangement collateralized by certain accounts receivable.


(7)	Non-collateralized debt arrangement.


(8)	Debt discount of $57.0 million and $61.9 million for the 1.00% Notes, $100.5 million and $104.3 million for the 1.625% Notes and $12.0 million and $12.5 million for the Term Loan "B" Facility as of March 30, 2018 and December 31, 2017, respectively.


(9)	Debt issuance costs of $8.0 million and $8.6 million for the 1.00% Notes, $9.6 million and $10.0 million for the 1.625% Notes and $24.8 million and $25.8 million for the Term Loan "B" Facility as of March 30, 2018 and December 31, 2017, respectively.


(10)	The Company has historically renewed these arrangements annually.

Expected maturities relating to the Company’s long-term debt (including current maturities) as of March 30, 2018 are as follows (in millions):



Period	Expected Maturities
Remainder of 2018	$	806.4
2019	47.7
2020	9.8
2021	400.0
2022	—
Thereafter	1,779.6
Total	$	3,043.5

1.00% Notes due 2020

On June 8, 2015, the Company completed a private placement of $690.0 million of its 1.00% Notes to qualified institutional buyers pursuant to Rule 144A under the Securities Act. The 1.00% Notes are governed by an indenture between the Company, as the issuer, the guarantors named therein and Wells Fargo Bank, National Association, as trustee (the “1.00% Indenture”). The 1.00% Notes are convertible by holders into cash and shares of the Company’s common stock at a conversion rate of 54.0643 shares of common stock per $1,000 principal amount of notes (subject to adjustment in certain events), which is equivalent to an initial conversion price of $18.50 per share of common stock. The Company will settle conversion of all 1.00% Notes validly tendered for conversion in cash, shares of the Company’s common stock or a combination of cash and shares to be determined by the Company. Holders may convert their 1.00% Notes only under the following circumstances: (i) during any calendar quarter commencing after the calendar quarter ending on September 30, 2015, if the last reported sale price of common stock for at least 20 trading days (whether or not consecutive) during the period of 30 consecutive trading days ending on the last trading day of the immediately preceding calendar quarter is greater than or equal to 130% of the conversion price on each applicable trading day; (ii) during the five business-day period immediately following any five consecutive trading-day period in which the trading price per $1,000 principal amount of 1.00% Notes for each day of such period was less than 98% of the product of the closing sale price of the Company’s common stock and the conversion rate; (iii) upon occurrence of the specified transactions described in the 1.00% Indenture; or (iv) on and after September 1, 2020 (each considered a "trigger"). Upon conversion of the 1.00% Notes, the Company will deliver cash, shares of its common stock or a combination of cash and shares of its common stock, at the Company’s election.

The last reported sale price of the Company’s common stock for at least 20 trading days during the period of 30 consecutive trading days ending on March 31, 2018 was greater than or equal to $24.05 (130% of the conversion price) on each applicable trading day. As a result, the Company recorded the outstanding balance, net of discount, of $625.0 million of the 1.00% Notes as a current portion of long-term debt as of March 30, 2018, and as required by the 1.00% Indenture, gave notice to the trustee, the conversion agent and each holder on March 29, 2018 that each holder has the right to surrender any portion of its 1.00% Notes (in minimum denominations of $1,000 in principal amount or an integral multiple thereof) for conversion during the calendar quarter ending June 30, 2018 (and only during such calendar quarter unless the trigger remains) pursuant to the terms of the 1.00% Indenture.

Note Payable to SMBC

On January 31, 2013, the Company amended and restated its seven-year, non-collateralized loan obligation with SANYO Electric. In connection with the amendment and restatement of the loan agreement, SANYO Electric assigned all of its rights under the loan agreement to SMBC. The loan had an original principal amount of approximately $377.5 million and had a principal balance of $122.7 million as of December 31, 2017. The entire balance was repaid on the due date of January 2, 2018.

Earnings Per Share and Equity

3 Months Ended

Mar. 30, 2018

Earnings Per Share [Abstract]

Earnings Per Share and Equity

Note 8: 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, 2018		March 31, 2017
Net income attributable to ON Semiconductor Corporation	$	139.6	$	78.2
Basic weighted-average common shares outstanding	425.9		419.8
Dilutive effect of share-based awards	5.7		6.0
Dilutive effect of convertible notes	12.6		—
Diluted weighted-average common shares outstanding	444.2		425.8

Net income per common share attributable to ON Semiconductor Corporation:
Basic	$	0.33	$	0.19
Diluted	$	0.31	$	0.18

Basic income per common share is computed by dividing net income attributable to ON Semiconductor Corporation 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 shares relating to RSUs is calculated by applying the treasury stock method. Share-based awards whose impact is considered to be anti-dilutive under the treasury stock method were excluded from the diluted net income per share calculation. The excluded number of anti-dilutive shares subject to share-based awards was 0.5 million and 0.9 million for the quarters ended March 30, 2018 and March 31, 2017, respectively.

The dilutive impact related to the Company's 1.00% Notes and 1.625% Notes is determined in accordance with the net share settlement requirements prescribed by ASC Topic 260, Earnings Per Share. Under the net share settlement calculation, the Company's 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. A dilutive effect occurs when the stock price exceeds the conversion price for each series of the convertible notes. During the quarter ended March 30, 2018, the average share price exceeded the conversion price for both the 1.00% Notes and the 1.625% Notes and the impact of the excess over par value is included in calculating the dilutive effect of the convertible notes. 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. Additionally, if the average price of the Company's common stock exceeds $25.96 per share, with respect to the 1.00% Notes, or $30.70 per share, with respect to the 1.625% Notes, for a reporting period, the Company will also include the effect of the additional potential shares, using the treasury stock method, that may be issued related to the warrants that were issued concurrently with the issuance of the 1.00% Notes and 1.625% Notes, respectively. Prior to conversion, the convertible note hedges are not considered for purposes of the earnings per share calculations, as their effect would be anti-dilutive. Upon conversion, the convertible note hedges are expected to offset the dilutive effect of the 1.00% Notes and 1.625% Notes, respectively, when the stock price is above $18.50 per share, with respect to the 1.00% Notes, and $20.72 per share, with respect to the 1.625% Notes.

Equity

Share Repurchase Program

There were no repurchases of the Company's common stock under the share repurchase program during the quarters ended March 30, 2018 and March 31, 2017.

Shares for Restricted Stock Units Tax Withholding

Treasury stock is recorded at cost and is presented as a reduction of stockholders' equity in the accompanying consolidated financial statements. Shares with a fair market value equal to the applicable statutory minimum amount of the employee withholding taxes due are withheld by the Company upon the vesting of RSUs to pay the applicable statutory minimum amount of employee withholding taxes and are considered common stock repurchases. The Company then pays the applicable statutory minimum amount of withholding taxes in cash. The amounts remitted for the quarter ended March 30, 2018 was $18.8 million, for which the Company withheld 0.7 million shares of common stock that were underlying the RSUs that vested. The amount remitted for the quarter ended March 31, 2017 was $13.0 million, for which the Company withheld approximately 0.9 million shares of common stock that were underlying the RSUs that vested. None of these shares had been reissued or retired as of March 30, 2018, but may be reissued or retired by the Company at a later date. These repurchases do not count against the Company's share repurchase program.

Non-Controlling Interest

The Company's entity which operates assembly and test operations in Leshan, China is owned by Leshan-Phoenix Semiconductor Company Limited, a joint venture company in which the Company owns a majority of the outstanding equity interests (“Leshan”). The Company owns 80% of the outstanding equity interests in Leshan and its investment in Leshan has been consolidated in the Company's financial statements.

At December 31, 2017, the non-controlling interest balance was $22.2 million. This balance increased to $23.1 million as of March 30, 2018, resulting from the non-controlling interest's $0.9 million share of the earnings for the quarter ended March 30, 2018.

Share-Based Compensation

3 Months Ended

Mar. 30, 2018

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Share-Based Compensation

Note 9: Share-Based Compensation

Total share-based compensation expense related to the Company's stock options, RSUs, stock grant awards and ESPP were recorded within the Consolidated Statements of Operations and Comprehensive Income as follows (in millions):



	Quarter Ended
	March 30, 2018		March 31, 2017
Cost of revenues	$	1.6	$	1.5
Research and development	3.2		2.9
Selling and marketing	3.2		2.8
General and administrative	10.4		7.9
Share-based compensation expense before income taxes	$	18.4	$	15.1
Related income tax benefits ⁽¹⁾	3.9		5.3
Share-based compensation expense, net of taxes	$	14.5	$	9.8


⁽¹⁾	Tax benefit calculated using the federal statutory rate of 21% and 35% for the quarters ended March 30, 2018 and March 31, 2017, respectively.

At March 30, 2018, total unrecognized estimated share-based compensation expense, net of estimated forfeitures, related to non-vested stock options was less than $0.1 million, which is expected to be recognized over a weighted-average period of 4 months. At March 30, 2018, total unrecognized share-based compensation expense, net of estimated forfeitures, related to non-vested RSUs with time-based service conditions and performance-based vesting criteria was $130.9 million, which is expected to be recognized over a weighted-average period of 1.98 years. The total intrinsic value of stock options exercised during the quarter ended March 30, 2018 was $9.4 million. The Company received cash of $3.6 million for the quarter ended March 30, 2018 from the exercise of stock options. Upon option exercise, vesting of RSUs, stock grant awards or completion of a purchase under the ESPP, the Company issues new shares of common stock.

Share-based compensation expense is based on awards that are 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. The annualized pre-vesting forfeiture rate for stock options was estimated to be 11% during the quarters ended March 30, 2018 and March 31, 2017. The annualized pre-vesting forfeiture rate for RSUs was estimated to be 5% during the quarters ended March 30, 2018 and March 31, 2017.

Shares Available

As of March 30, 2018, there was an aggregate of 34.9 million shares of common stock available for grant under the Amended and Restated SIP and 8.0 million shares available for issuance under the ESPP. As of December 31, 2017, there was an aggregate of 39.0 million shares of common stock available for grant under the Company's Amended and Restated SIP and 8.0 million shares available for issuance under the ESPP.

Stock Options

A summary of stock option transactions for all stock option plans is as follows (in millions, except per share and contractual term data):



	Quarter Ended March 30, 2018
	Number of Shares		Weighted-Average Exercise Price Per Share		Weighted-Average Remaining Contractual Term (in years)	Aggregate Intrinsic Value (In-The-Money)
Outstanding at December 31, 2017	1.1		$	6.95
Granted	—		—
Exercised	(0.6	)	6.79
Canceled	—		—
Outstanding at March 30, 2018	0.5		$	7.11	1.18	$	9.2

Exercisable at March 30, 2018	0.5		$	7.11	1.18	$	9.2

All outstanding options had exercise prices below $24.46 per share, the closing price of the Company's common stock at March 30, 2018.

Restricted Stock Units

RSUs generally vest over three years with service-based requirements or performance-based requirements or a combination of service-based and performance-based requirements and are payable in shares of the Company's common stock upon vesting. A summary of the RSU transactions for the quarter ended March 30, 2018 is as follows (in millions, except per share data):



	Number of Shares		Weighted-Average Grant Date Fair Value Per Share
Non-vested RSUs at December 31, 2017	9.8		$	12.63
Granted	2.7		24.43
Released	(2.6	)	12.18
Forfeited	(0.1	)	13.49
Non-vested RSUs at March 30, 2018	9.8		15.94

Commitments and Contingencies

3 Months Ended

Mar. 30, 2018

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

Note 10: Commitments and Contingencies

Leases

The following represents future minimum lease obligations under non-cancelable operating leases as of March 30, 2018 (in millions):



Remainder of 2018	$	29.1
2019	33.8
2020	23.7
2021	19.1
2022	14.6
Thereafter	55.9
Total ⁽¹⁾	$	176.2

⁽¹⁾ Excludes $17.5 million of expected sublease income.

Environmental Contingencies

The Company’s headquarters in Phoenix, Arizona are located on property that is a “Superfund” site, which is a property listed on the National Priorities List and subject to clean-up activities under the Comprehensive Environmental Response, Compensation, and Liability Act (“CERCLA”). Motorola and Freescale (acquired by NXP Semiconductors N.V.) 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 separation from Motorola in 1999, 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.

The Company’s former front-end manufacturing location in Aizu, Japan is located on property where soil and ground water contamination was detected. The Company believes that the contamination originally occurred during a time when the facility was operated by a prior owner. The Company worked with local authorities to implement a remediation plan and has completed remaining remediation. The majority of the cost of remediation was covered by insurance. Any costs to the Company in connection with this matter have not been, and, based on the information available, are not expected to be, material.

The Company’s manufacturing facility in the Czech Republic has ongoing remediation projects to respond to releases of hazardous substances that occurred during the years that this facility was operated by government-owned entities. The remediation projects consist 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. The government of the Czech Republic has agreed to indemnify the Company and its respective subsidiaries, subject to specified limitations, for remediation costs associated with this historical contamination. Any costs to the Company in connection with this matter have not been, and, based on the information available, 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. Any costs to the Company in connection with this matter have not been, and, based on the information available, are not expected to be, material.

As a result of the acquisition of AMIS of 2008, 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 obligations relating to environmental remediation and cleanup at this location. Any costs to the Company in connection with this matter have not been, and, based on the information available, are not expected to be, material.

Through its acquisition of Fairchild, the Company acquired a facility in South Portland, Maine. This facility has ongoing environmental remediation projects to respond to certain releases of hazardous substances that occurred prior to the leveraged recapitalization of Fairchild from its former parent company, National Semiconductor Corporation, which is now owned by Texas Instruments, Inc. Although the Company may incur certain liabilities with respect to these remediation projects, pursuant to the asset purchase agreement entered into in connection with the Fairchild recapitalization, National Semiconductor Corporation agreed to indemnify Fairchild, without limitation and for an indefinite period of time, for all future costs related to these projects. Under a 1999 asset purchase agreement pursuant to which Fairchild purchased the power device business of Samsung, Samsung agreed to indemnify Fairchild in an amount up to $150.0 million for remediation costs and other liabilities related to historical contamination at Samsung’s Bucheon, South Korea operations. Any costs to the Company in connection with this matter have not been, and, based on the information available, are not expected to be, material.

Under a 2001 asset purchase agreement pursuant to which Fairchild purchased a manufacturing facility in Mountain Top, Pennsylvania, Intersil Corp. (acquired by Renesas Electronics Corporation) agreed to indemnify Fairchild for remediation costs and other liabilities related to historical contamination at the facility. Any costs to the Company incurred to respond to the above conditions and projects have not been, and are not expected to be, material, and any future payments the Company makes in connection with such liabilities are not expected to be material.

The Company was notified by the Environmental Protection Agency (“EPA”) that it has been identified as a “potentially responsible party” (“PRP”) under CERCLA in the Chemetco Superfund matter. Chemetco, a defunct reclamation services supplier that operated in Illinois at what is now a Superfund site, has performed reclamation services for the Company in the past. The EPA is pursuing Chemetco customers for contribution to the site cleanup activities. The Company has joined a PRP group which is cooperating with the EPA in the evaluation and funding of the cleanup. Any costs to the Company in connection with this matter have not been, and, based on the information available, are not expected to be, material.

Financing Contingencies

In the ordinary 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, but not limited to, material purchase commitments, agreements to mitigate collection risk, leases, utilities or customs guarantees. As of March 30, 2018, the Company's Revolving Credit Facility included $15.0 million of availability for the issuance of letters of credit. There were $0.4 million of letters of credit outstanding under the Revolving Credit Facility as of March 30, 2018, which reduces the Company's borrowing capacity. The Company also had outstanding guarantees and letters of credit outside of its Revolving Credit Facility totaling $6.4 million as of March 30, 2018.

As part of obtaining financing in the ordinary course of business, the Company has issued guarantees related to certain of its capital lease obligations, equipment financing, lines of credit and real estate mortgages, which totaled $113.9 million as of March 30, 2018.

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

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 IP 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 economic damage, bodily injury or property damage. 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 rights to such customer for valid defective product claims.

The Company and its subsidiaries provide for indemnification of directors, officers and other persons in accordance with limited liability company operating agreements, certificates of incorporation, by-laws, articles of association or similar organizational documents, as the case may be. Section 145 of the Delaware General Corporation Law (“DGCL”) authorizes a court to award, or a corporation’s board of directors to grant, indemnity to directors and officers under certain circumstances and subject to certain limitations. The terms of Section 145 of the DGCL are sufficiently broad to permit indemnification under certain circumstances for liabilities, including reimbursement of expenses incurred, arising under the Exchange Act. As permitted by the DGCL, the Company’s Amended and Restated Certificate of Incorporation, as amended (the “Certificate of Incorporation”), contains provisions relating to the limitation of liability and indemnification of directors and officers. The Certificate of Incorporation eliminates the personal liability of each of the Company’s directors to the fullest extent permitted by Section 102(b)(7) of the DGCL, as it may be amended or supplemented, and provides that the Company will indemnify its directors and officers to the fullest extent permitted by Section 145 of the DGCL, as amended from time to time.

The Company has entered into indemnification agreements with each of its directors and executive officers. The form of agreement (the “Indemnification Agreement”) provides, subject to certain exceptions and conditions specified in the Indemnification Agreement, that the Company will indemnify each indemnitee to the fullest extent permitted by Delaware law against all expenses, judgments, fines and amounts paid in settlement actually and reasonably incurred by such person in connection with a proceeding or claim in which such person is involved because of his or her status as one of the Company’s directors or executive officers. In addition, the Indemnification Agreement provides that the Company will, to the extent not prohibited by law and subject to certain exceptions and repayment conditions, advance specified indemnifiable expenses incurred by the indemnitee in connection with such proceeding or claim. The foregoing description of the Indemnification Agreement does not purport to be complete and is qualified in its entirety by reference to the full and complete terms of the Indemnification Agreement, which is filed as Exhibit 10.1 to the Current Report on Form 8-K filed by the Company on February 25, 2016 and is incorporated by reference herein.

The Company also maintains directors’ and officers’ insurance policies that indemnify its directors and officers against various liabilities, including certain liabilities under the Exchange Act, that might be incurred by any director or officer in his or her capacity as such.

The agreement and plan of merger relating to the acquisition of Fairchild (the "Fairchild Agreement") provides for indemnification and insurance rights in favor of Fairchild’s then current and former directors, officers and employees. Specifically, the Company has agreed that, for no fewer than six years following the Fairchild acquisition, the Company will: (a) indemnify and hold harmless each such indemnitee against losses and expenses (including advancement of attorneys’ fees and expenses) in connection with any proceeding asserted against the indemnified party in connection with such person’s servings as a director, officer, employee or other fiduciary of Fairchild or its subsidiaries prior to the effective time of the acquisition; (b) maintain in effect all provisions of the certificate of incorporation or bylaws of Fairchild or any of its subsidiaries or any other agreements of Fairchild or any of its subsidiaries with any indemnified party regarding elimination of liability, indemnification of officers, directors and employees and advancement of expenses in existence on the date of the Fairchild Agreement for acts or omissions occurring prior to the effective time of the acquisition; and (c) subject to certain qualifications, provide to Fairchild’s then current directors and officers an insurance and indemnification policy that provides coverage for events occurring prior to the effective time of the acquisition that is no less favorable than Fairchild’s then-existing policy, or, if insurance coverage that is no less favorable is unavailable, the best available coverage.

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

From time to time, the Company is party to various legal proceedings arising in the ordinary course of business, including indemnification claims, claims of alleged infringement of patents, trademarks, copyrights and other intellectual property rights, claims of alleged non-compliance with contract provisions and claims related to alleged violations of laws and regulations. The Company regularly evaluates the status of the legal proceedings in which it is involved to assess whether a loss is probable or there is a reasonable possibility that a loss, or an additional loss, may have been incurred and determine if accruals are appropriate. If accruals are not appropriate, the Company further evaluates each legal proceeding to assess whether an estimate of possible loss or range of possible loss can be made for disclosure. Although litigation is inherently unpredictable, the Company believes that it has adequate provisions for any probable and estimable losses. It is possible, nevertheless, that the Company’s consolidated financial position, results of operations or liquidity could be materially and adversely affected in any particular period by the resolution of a legal proceeding. The Company’s estimates do not represent its maximum exposure. Legal expenses related to defense, negotiations, settlements, rulings and advice of outside legal counsel are expensed as incurred.

The Company is currently involved in a variety of legal matters that arise in the ordinary course of business. Based on information currently available, except as disclosed below, the Company is not involved in any pending or threatened legal proceedings that it believes could reasonably be expected to have a material adverse effect on its financial condition, results of operations or liquidity. The litigation process and the administrative process at the United States Patent and Trademark Office (the “USPTO”) are inherently uncertain, and the Company cannot guarantee that the outcome of these matters will be favorable to it.

Patent Litigation with Power Integrations, Inc.

There are eight outstanding civil litigation proceedings with Power Integrations, Inc. (“PI”), five of which were pending between PI and various Fairchild entities (including Fairchild Semiconductor International, Inc., Fairchild Semiconductor Corporation, and Fairchild (Taiwan) Corporation, f/k/a System General Corporation (collectively referred to in this sub-section as “Fairchild”)), prior to the acquisition of Fairchild. The Company is vigorously defending the lawsuits filed by PI and believes that it has strong defenses. There are also over two dozen outstanding administrative proceedings between the parties at the USPTO in which each party is challenging the validity of the other party's patents.

The outcome of any litigation is inherently uncertain and difficult to predict. Any estimate or statement regarding any reserve or the estimated range of possible losses is made solely in compliance with applicable GAAP requirements, and is not a statement or admission that the Company is or should be liable in any amount, or that any arguments, motions or appeals before any Court lack merit or are subject to impeachment. To the contrary, the Company believes that it has significant and meritorious grounds for judgment in its favor with respect to all of the PI cases and that the Company’s appeals or motions currently pending at the district court level will significantly reduce or eliminate all prior adverse jury verdicts. Subject to the foregoing, as of the date of the filing of this Form 10-Q, the Company estimates its range of possible losses for all PI cases to be between approximately $4.0 million and $20.0 million in the aggregate.

Power Integrations v. Fairchild Semiconductor International, Inc. et al. (October 20, 2004, Delaware, 1:04-cv-01371-LPS): PI filed this lawsuit in 2004 in the U.S. District Court for the District of Delaware against Fairchild, alleging that certain of Fairchild’s pulse width modulation (“PWM”) integrated circuit products infringed U.S. patents owned by PI. The lawsuit sought a permanent injunction as well as money damages for Fairchild’s alleged infringement. In October 2006, a jury returned a willful infringement verdict and assessed damages against Fairchild. Fairchild voluntarily stopped U.S. sales and importation of those products in 2007 and has been offering replacement products since 2006. In December 2008, the judge overseeing the case reduced the jury’s 2006 damages award from $34.0 million to approximately $6.1 million and ordered a new trial on the issue of willfulness. Following the new trial held in June 2009, the court found Fairchild’s infringement to have been willful, and in January 2011 the court awarded PI final damages in the amount of $12.2 million. Fairchild appealed the final damages award, willfulness finding, and other issues to the U.S. Court of Appeals for the Federal Circuit. In March 2013, the Court of Appeals vacated substantially all of the damages award, ruling that there was no basis upon which a reasonable jury could find Fairchild liable for induced infringement. The Court of Appeals also vacated the earlier judgment of willful patent infringement. The full Court of Appeals and the Supreme Court of the United States later denied PI’s request to review the Court of Appeals ruling. The Court of Appeals instructed the lower court to conduct further proceedings to determine damages based on approximately $750,000 worth of sales and imports of affected products and to re-assess its finding that the infringement was willful. In December 2017, the lower court reinstated the willfulness finding, but has since stayed resolution of the other outstanding issues, including damages, pending a Supreme Court decision in a separate matter that is expected in the summer of 2018.

Power Integrations v. Fairchild Semiconductor International, Inc. et al. (May 23, 2008, Delaware, 1:08-cv-00309-LPS): This lawsuit was initiated by PI in 2008 in the U.S. District Court for the District of Delaware against Fairchild, alleging that certain other PWM products infringed several U.S. patents owned by PI. On October 14, 2008, Fairchild filed a patent infringement lawsuit against PI in the U.S. District Court for the District of Delaware, alleging that certain PI products infringed U.S. patents owned by Fairchild. Each lawsuit included claims for money damages and a request for a permanent injunction. These two lawsuits were consolidated and heard together in a jury trial in April 2012, during which the jury found that PI infringed one of the two U.S. patents owned by Fairchild and upheld the validity of both of the Fairchild patents. In the same verdict, the jury found that Fairchild infringed two of four U.S. patents asserted by PI and that Fairchild had induced its customers to infringe the asserted patents. (The court later ruled that Fairchild infringed one other asserted PI patent that the jury found was not infringed.) The jury also upheld the validity of the asserted PI patents, and the court entered a permanent injunction against Fairchild. Willfulness and damages were not considered in the April 2012 trial, but were reserved for subsequent proceedings. Fairchild and PI appealed the liability phase of this litigation to the U.S. Court of Appeals for the Federal Circuit, which heard arguments in July 2016 and issued a decision in December 2016. In the decision, the appeals court vacated the jury’s finding that Fairchild induced infringement of PI’s patents, held that one of PI’s patents was invalid, vacated the permanent injunction against Fairchild, reversed the jury’s finding that PI infringed the Fairchild patent and remanded the case back to the lower court for further proceedings consistent with these rulings.

The Company is preparing for a trial later this year at which willfulness, inducement and money damages are expected to be addressed.

Power Integrations v. Fairchild Semiconductor International Inc. et al. (November 4, 2009, Northern District of California, 3:09-cv-05235-MMC): In 2009, PI sued Fairchild in the U.S. District Court for the Northern District of California, alleging that several of Fairchild’s products infringe three of PI’s patents. Fairchild filed counterclaims asserting that PI infringed two Fairchild patents. During the initial trial on this matter in 2014, a jury found that Fairchild willfully infringed two PI patents, awarded PI $105.0 million in damages and found that PI did not infringe any Fairchild patent. In September 2014, the court granted a motion filed by Fairchild that sought to set aside the jury’s determination that it acted willfully, and held that, as a matter of law, Fairchild’s actions were not willful. In November 2014, in response to another post-trial motion filed by Fairchild, the trial court ruled that the jury lacked sufficient evidence on which to base its damages award and, consequently, vacated the $105.0 million verdict and ordered a second trial on damages. The second damages trial was held in December 2015, in which a jury awarded PI $139.8 million in damages. Fairchild filed a number of post-trial motions challenging the second damages verdict, but the court ruled against Fairchild on these motions and awarded PI approximately $7.0 million in pre-judgment interest. Following the court’s rulings on these issues, PI moved the court to reinstate the jury’s willfulness finding and sought enhanced damages and attorneys’ fees. On January 23, 2017, the court reinstated the jury’s willful infringement finding, but denied PI’s motion for enhanced damages and attorneys’ fees in its entirety. The Company has filed a notice of appeal with the U.S. Court of Appeals for the Federal Circuit with respect to the current damages award as well as the 2014 verdict finding that PI’s patents were infringed and valid. The appeal briefing is complete, and oral argument was held on April 2, 2018, with a decision expected later this year. Separately, on May 26, 2017, the district court ordered Fairchild to obtain a bond for the judgment pending appeal, and on June 22, 2017, the district court accepted Fairchild’s bond and stayed execution of judgment. All claims of the two PI patents found to be infringed by Fairchild and that support the damages verdict have since been determined to be unpatentable in several inter partes review administrative proceedings described below. The impact of the USPTO’s unpatentability determinations on the district court judgment is uncertain at this stage of the proceedings.

Fairchild Semiconductor International Inc. et al. v. Power Integrations (May 1, 2012, Delaware, 1:12-cv-00540-LPS): In May 2012, Fairchild sued PI in the U.S. District Court for the District of Delaware, and alleged that various PI products infringe Fairchild’s U.S. patents. PI filed counterclaims of patent infringement against Fairchild, asserting five PI patents. Of those five patents, the court granted Fairchild summary judgment of no infringement on one, and PI voluntarily withdrew a second and was forced to remove a third patent during the trial, which began in May 2015. In that trial, the jury found that PI induced infringement of Fairchild’s patent rights and awarded Fairchild $2.4 million in damages. The same jury found that Fairchild infringed a PI patent and awarded PI damages of $100,000. Based on the December 2016 appellate court decision in the litigation filed in Delaware in 2008 (described above), on July 13, 2017, the district court vacated the jury’s finding that PI infringed Fairchild’s patent. The court has tentatively scheduled a trial for November 2018 to resolve minor outstanding issues before final judgment can be entered.

Power Integrations v. Fairchild Semiconductor International Inc. et al. (October 21, 2015, Northern District of California, 3:15-cv-04854 MMC): In 2015, PI filed another complaint for patent infringement against Fairchild in the U.S. District Court for the Northern District of California, alleging Fairchild's products willfully infringe two PI patents. In the complaint, PI is seeking a permanent injunction, unspecified damages, a trebling of damages, and an accounting of costs and fees. Fairchild answered and counterclaimed, alleging infringement by PI of four Fairchild patents related to aspects of PI’s products, and also seeking damages and a permanent injunction. The lawsuit is in its earliest stages, and has been stayed pending the outcome of the Company’s administrative challenges to the two PI patents asserted against Fairchild, which are described below. PI has also filed administrative challenges to Fairchild’s asserted patents.

Power Integrations v. ON Semiconductor Corporation, and Semiconductor Components Industries, LLC (November 1, 2016, Northern District of California, 5:16-cv-06371-BLF and 5:17-cv-03189): On August 11, 2016, ON Semiconductor Corporation and SCILLC (collectively referred to in this sub-section as “ON Semi”) filed a lawsuit against PI in the U.S. District Court for the District of Arizona, alleging that PI infringed six patents and seeking a permanent injunction and money damages for the alleged infringement. The lawsuit also sought a claim for a declaratory judgment that ON Semi does not infringe several of PI’s patents. Rather than responding to ON Semi’s lawsuit in Arizona, PI filed a separate lawsuit in the U.S. District Court for the Northern District of California in November 2016, alleging that ON Semi infringes six PI patents, including two of the three PI patents in ON Semi’s declaratory judgment claims from Arizona. PI also moved the Arizona court to dismiss ON Semi’s lawsuit, or in the alternative to transfer the lawsuit to California. Following various procedural motions, ON Semi’s Arizona action has been transferred to the U.S. District Court for the Northern District of California and consolidated with PI’s November 2016 lawsuit, in which PI has subsequently asserted a claim for infringement on the last of the three PI patents in ON Semi’s original declaratory judgment claims. The lawsuit is in its early stages, but the parties have begun to engage in discovery, with substantive developments expected throughout the course of 2018.

ON Semiconductor Corporation and Semiconductor Components Industries, LLC v. Power Integrations, Inc. (March 9, 2017, District of Delaware, 1:17-cv-00247-LPS-CJB): On March 9, 2017, ON Semi filed a lawsuit against PI in the U.S. District Court for the District of Delaware, alleging that PI’s InnoSwitch family of products infringe six of ON Semi’s U.S. patents. Following some procedural motions, PI has since counterclaimed alleging infringement by ON Semi of seven of PI’s U.S. Patents. Both parties seek money damages and a permanent injunction. The lawsuit is in its early stages, but the parties have begun to engage in discovery, with substantive developments expected throughout the course of 2018.

Semiconductor Components Industries, LLC v. Power Integrations, Inc. (November 2017, Taiwan Intellectual Property Court, 106-Ming-min-bu-Tzu-238): In November 2017, Semiconductor Components Industries, LLC filed a lawsuit against PI in Taiwan alleging infringement by PI of certain of ON Semi’s Taiwanese patents. The lawsuit is in its early stages.

Administrative Challenges to PI’s Patents

In addition to the eight court proceedings described above, there are presently two dozen pending inter partes review administrative proceedings between PI and ON Semi/Fairchild. Each of these administrative proceedings seeks to invalidate certain claims asserted in the various court proceedings. For the two proceedings filed by ON Semi involving claims asserted in the case filed in 2009 in the Northern District of California, the USPTO has issued a Final Written Decision finding that all of the claims challenged in those proceedings are unpatentable, and PI recently filed a notice of appeal for those decisions. The USPTO has also issued Final Written Decisions in seven additional proceedings in ON Semiconductor’s favor. In three other of the proceedings, initiated by PI, the USPTO has instituted a review of three ON Semi patents that are being asserted against PI, but the USPTO has not rendered a Final Written Decision in any of those three cases. All of the other proceedings remain pending, with further developments expected during 2018.

Litigation with Acbel Polytech, Inc.

On November 27, 2013, Fairchild and Fairchild Semiconductor Corporation were named as defendants in a complaint filed by Acbel Polytech, Inc. (“Acbel”) in the U.S. District Court for the District of Massachusetts. The lawsuit alleged a number of causes of action, including breach of warranty, fraud, negligence and strict liability, and has been docketed as Acbel Polytech, Inc. v. Fairchild Semiconductor International, Inc. et al, Case # 1:13-CV-13046-DJC. On December 10, 2016, the Court issued an order on the Company’s motion for summary judgment dismissing all of Acbel’s claims except for claims alleging breach of implied warranties. A bench trial was held in June 2017. On December 27, 2017, the Court rendered a verdict in favor of the Fairchild defendants on the remaining implied warranty claims. On January 24, 2018, Acbel filed a notice of appeal. On February 6, 2018, Fairchild filed notice of a cross appeal.

Intellectual Property Matters

The Company faces risk to exposure from claims of infringement of the IP rights of others. In the ordinary course of business, the Company receives letters asserting that the Company’s products or components breach another party’s rights. These threats may seek that the Company make royalty payments, stop use of such rights, or other remedies.

Fair Value Measurements

3 Months Ended

Mar. 30, 2018

Fair Value Disclosures [Abstract]

Fair Value Measurements

Note 11: Fair Value Measurements

Fair Value of Financial Instruments

The following table summarizes the Company's financial assets and liabilities, excluding pension assets, measured at fair value on a recurring basis (in millions):



			Fair Value Hierarchy
Description	As of March 30, 2018		Level 1		Level 2		Level 3
Assets:
Cash and cash equivalents:
Demand and time deposits	$	14.5	$	14.5	$	—	$	—
Money market funds	0.4		0.4		—		—

During the quarter ended March 30, 2018, the Company reduced the contingent consideration payable relating to the second earn-out for the AXSEM acquisition to zero due to a revision in the Company's expectations regarding the likelihood that the earn-out would be achieved. The gain was recorded in other expense in the Consolidated Statements of Operations and Comprehensive Income.



			Fair Value Hierarchy
Description	As of December 31, 2017		Level 1		Level 2		Level 3
Assets:
Cash and cash equivalents:
Demand and time deposits	$	71.7	$	71.7	$	—	$	—
Money market funds	0.2		0.2		—		—
Liabilities:
Contingent consideration	$	2.3	$	—	$	—	$	2.3

Other

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.

Fair Value of 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) are as follows (in millions):



	As of March 30, 2018				As of December 31, 2017
	Carrying Amount		Fair Value		Carrying Amount		Fair Value
Long-term debt, including current portion
Convertible notes	$	1,089.9	$	1,749.0	$	1,080.1	$	1,596.7
Long-term debt	$	1,705.6	$	1,700.9	$	1,833.2	$	1,845.4

The fair value of the Company's 1.00% Notes and 1.625% Notes were estimated based on market prices in active markets (Level 1). 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 (Level 2) at March 30, 2018 and December 31, 2017.

Cost Method Investments

Investments in equity securities that do not qualify for fair value accounting are accounted for under the cost method. Accordingly, the Company accounts for investments in companies that it does not control, or have significant influence over, under the cost method, as applicable. If a decline in the fair value of a cost method investment is determined to be other than temporary, an impairment charge is recorded, and the carrying value of the cost method investment is reduced to fair value. The Company evaluates all of its cost method investments for impairment; however, it is not required to determine the fair value of its investment unless impairment indicators are present.

The Company’s cost method investments had a carrying value of $12.6 million as of March 30, 2018 and December 31, 2017. See Note 16: ''Subsequent Events'' for further information.

- 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 + Details

Financial Instruments

3 Months Ended

Mar. 30, 2018

Investments, All Other Investments [Abstract]

Financial Instruments

Note 12: 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 and entering into trades for any currency to intentionally increase the underlying exposure.

The Company primarily hedges existing assets and liabilities associated with transactions currently on its balance sheet, which are undesignated hedges for accounting purposes.

As of March 30, 2018 and December 31, 2017, the Company had net outstanding foreign exchange contracts with notional amounts of $115.6 million and $130.5 million, respectively. Such contracts were obtained through financial institutions and were scheduled to mature within one to three months from the time of purchase. 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 underlying assets, liabilities and transactions to which they are related.

The following summarizes the Company’s net foreign exchange positions in U.S. dollars (in millions):



	As of March 30, 2018					As of December 31, 2017
	Buy (Sell)			Notional Amount		Buy (Sell)			Notional Amount
Euro	$	(29.0	)	$	29.0	$	(22.9	)	$	22.9
Japanese Yen	(15.9		)	15.9		(40.0		)	40.0
Philippine Peso	28.9			28.9		26.4			26.4
Other Currencies - Buy	35.4			35.4		30.9			30.9
Other Currencies - Sell	(6.4		)	6.4		(10.3		)	10.3
	$	13.0		$	115.6	$	(15.9	)	$	130.5

Amounts receivable or payable under the contracts are included in other current assets or accrued expenses in the accompanying Consolidated Balance Sheet. For the quarters ended March 30, 2018 and March 31, 2017, realized and unrealized foreign currency transactions totaled a $4.4 million loss and a $2.3 million loss, respectively. The realized and unrealized foreign currency transactions are included in other income and expenses in the Company's Consolidated Statements of Operations and Comprehensive Income.

Cash Flow Hedges

All derivatives are recognized on the balance sheet at their fair value and classified based on the instrument's maturity date.

Interest rate risk

The Company uses interest rate swap contracts to mitigate its exposure to interest rate fluctuations associated with the Term Loan "B" Facility. The Company does not use such swap contracts for speculative or trading purposes.

To partially offset the variability of future interest payments on the outstanding Term Loan “B” Facility arising from changes in LIBOR rates, on January 11, 2017, the Company entered into interest rate swap agreements with three financial institutions for notional amounts totaling $500.0 million (effective as of January 11, 2017), $750.0 million (effective as of December 29, 2017) and $1.0 billion (effective as of December 31, 2018) with expiry dates of December 29, 2017, December 31, 2018 and December 31, 2019, respectively. These agreements effectively hedge some of the future variable rate LIBOR interest expense to a fixed rate interest expense. The derivative instruments qualified for accounting as a cash flow hedge in accordance with ASC 815, and the Company designated it as such. The Company performed effectiveness assessments, and concluded that there is no ineffectiveness during the quarters ended March 30, 2018 and March 31, 2017.

Foreign currency risk

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.

For the quarters ended March 30, 2018 and March 31, 2017, the Company recorded a net loss of zero associated with cash flow hedges recognized as a component of cost of revenues. The Company did not have outstanding derivatives for its foreign currency exposure designated as cash flow hedges as of March 30, 2018 and March 31, 2017.

See Note 14: ''Changes in Accumulated Other Comprehensive Loss'' for the effective amounts related to derivative instruments designated as cash flow hedges affecting accumulated other comprehensive loss and the Company's Consolidated Statements of Operations and Comprehensive Income for the three months ended March 30, 2018.

Convertible Note Hedges

The Company entered into convertible note hedges in connection with the issuance of the 1.00% Notes and 1.625% Notes.

Other

At March 30, 2018, the Company had no outstanding commodity derivatives, currency swaps or options relating to either its debt instruments or investments. The Company does not hedge the value of its equity investments in its subsidiaries or affiliated companies. The Company is exposed to credit-related losses if counterparties to its foreign exchange contracts fail to perform their obligations. As of March 30, 2018, the counterparties to the Company’s hedge contracts are held at financial institutions which the Company believes to be highly rated, and no credit-related losses are anticipated.

Income Taxes	3 Months Ended
Income Taxes	Mar. 30, 2018
Income Tax Disclosure [Abstract]
Income Taxes	Note 13: Income Taxes The Company has historically determined its interim income tax provision by applying the estimated effective income tax rate expected to be applicable for the full fiscal year to the income before income taxes for the period. In determining the full year estimate, the Company does not include the estimated impact of unusual and/or infrequent items, which may cause significant variations in the customary relationship between income tax expense and income before income taxes. Significant judgment is exercised in determining the income tax provision due to transactions, credits and calculations where the ultimate tax determination is uncertain. The Company’s effective tax rate for the quarter ended March 30, 2018 was 10.5%, which differs from the U.S. federal income tax rate of 21% principally due to discrete benefits of $17.1 million relating to an increase in deferred tax assets expected to be realized in the foreseeable future due to the liquidation of a foreign subsidiary and $6.7 million relating to equity award excess tax benefits. These benefits are partially offset by foreign taxes for which the Company will not receive a U.S. tax credit as a result of U.S. tax reform and the Company's U.S. federal net operating loss carryforwards. In December 2017 the SEC staff issued Staff Accounting Bulletin No. 118, Income Tax Accounting Implications of the Tax Cuts and Jobs Act (“SAB 118”), which allows the Company to record provisional amounts during a measurement period not to extend beyond one year of the enactment date. As of March 30, 2018, the Company has not completed its accounting for the tax effects of the enactment of the Tax Act; however, in certain cases, specifically as follows, the Company made a reasonable estimate of (i) the effects on its existing deferred tax balances and (ii) the effects of the one-time mandatory repatriation tax. The Company recognized a provisional tax benefit of $449.9 million in the year ended December 31, 2017 associated with the items it could reasonably estimate. For the quarter ended March 30, 2018, there have not been any adjustments made to these estimates. The Company is still analyzing the Tax Act and refining its calculations, which could potentially impact the measurement of its tax balances. The Company expects to complete its analysis within the measurement period in accordance with SAB 118. At March 30, 2018, the Company was not able to reasonably estimate, and therefore has not recorded, deferred taxes for the Global Intangible Low-Taxed Income (“GILTI”) provisions of the Tax Act. The Company has not yet determined its policy election with respect to whether to record deferred taxes for basis differences expected to reverse as a result of the GILTI provisions in future periods or use the period cost method. The Company has, however, included an estimate of the current impact of GILTI in its tax provision for 2018. The Company recognizes interest and penalties related to unrecognized tax benefits in tax expense on the Company's Consolidated Statements of Operations and Comprehensive Income. The Company had approximately $6.4 million and $5.4 million of net interest and penalties accrued at March 30, 2018 and March 31, 2017, respectively. Although the Company cannot predict the timing of resolution with taxing authorities, if any, it believes it is reasonably possible that $13.4 million of its unrecognized tax benefits will be reduced in the next 12 months due to settlement with tax authorities or expiration of the applicable statute of limitations. Tax years 2013 and prior are generally not subject to examination by the Internal Revenue Services (the “IRS”) except for items involving tax attributes that have been carried forward to tax years whose statute of limitations remains open. The Company is not currently under IRS examination. For state tax returns, the Company is generally not subject to income tax examinations for years 2012 and prior. The Company is also subject to routine examinations by various foreign tax jurisdictions in which it operates. With respect to major jurisdictions outside the United States, the Company's subsidiaries are no longer subject to income tax audits for years prior to 2007. The Company is currently under audit in the following significant jurisdictions: China, Malaysia, Mauritius, Singapore and Vietnam.

Changes in Accumulated Other Comprehensive Loss

3 Months Ended

Mar. 30, 2018

Equity [Abstract]

Changes in Accumulated Other Comprehensive Loss

Note 14: Changes in Accumulated Other Comprehensive Loss

Amounts comprising the Company's accumulated other comprehensive loss and reclassifications are as follows (in millions):



	Foreign Currency Translation Adjustments			Effects of Cash Flow Hedges		Total
Balance as of December 31, 2017	$	(43.2	)	$	2.6	$	(40.6	)
Other comprehensive income prior to reclassifications	2.4			3.7		6.1
Amounts reclassified from accumulated other comprehensive loss	—			0.1		0.1
Net current period other comprehensive income (1)	2.4			3.8		6.2
Balance as of March 30, 2018	$	(40.8	)	$	6.4	$	(34.4	)

(1) Effects of cash flow hedges are net of tax of $1.0 million of tax expense for the quarter ended March 30, 2018.

Amounts which were reclassified from accumulated other comprehensive loss to the Company's Consolidated Statements of Operations and Comprehensive Income (net of tax of zero, in millions):



	Amounts Reclassified from Accumulated Other Comprehensive Loss
	Quarter Ended
	March 30, 2018			March 31, 2017		Statements of Operations and Comprehensive Income Line Item
Interest rate swaps	(0.1		)	0.2		Other income and expense
Total reclassifications	$	(0.1	)	$	0.2

Supplemental Disclosures

3 Months Ended

Mar. 30, 2018

Supplemental Cash Flow Elements [Abstract]

Supplemental Disclosures

Note 15: Supplemental Disclosures

Supplemental Disclosure of Cash Flow Information

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



	Quarter Ended
	March 30, 2018			March 31, 2017
Non-cash activities:
Capital expenditures in accounts payable and other liabilities	$	209.1		$	125.3
Cash (received) paid for:
Interest income	$	(0.9	)	$	(0.6	)
Interest expense	$	16.6		$	27.6
Income taxes	$	19.1		$	18.4

The Company adopted ASU 2016-18 on a retrospective basis during the quarter ended March 30, 2018. The following is a reconciliation of the captions in the Consolidated Balance Sheets to the Consolidated Statements of Cash Flows (in millions):



	As of
	March 30, 2018		December 31, 2017		March 31, 2017		December 31, 2016
Consolidated Balance Sheets:
Cash and cash equivalents	$	924.9	$	949.2	$	728.9	$	1,028.1
Restricted cash (included in other current assets)	17.4		17.4		17.7		17.7
Cash, cash equivalents and restricted cash in Consolidated Statements of Cash Flows	$	942.3	$	966.6	$	746.6	$	1,045.8

The restricted cash balance relates to the consideration held in escrow for the Aptina acquisition to be released upon satisfaction of certain outstanding items contained in the merger agreement.

Subsequent Events	3 Months Ended
Subsequent Events	Mar. 30, 2018
Subsequent Events [Abstract]
Subsequent Events	Note 16: Subsequent Events As announced on October 10, 2017, ON Semiconductor entered into an agreement to acquire a 30 percent incremental interest in Aizu Fujitsu Semiconductor Manufacturing Limited (“AFSM”), which operates an 8-inch wafer fabrication facility in Aizu-Wakamatsu. On April 1, 2018, (the "second closing date"), the purchase of such incremental interest for approximately $20.0 million in cash closed, resulting in a 40 percent ownership stake in AFSM by the Company. The Company previously held a 10 percent interest, which was accounted for as a cost method investment. Subject to the fulfillment of certain conditions, the Company will be required to increase its ownership to 60 percent between one and six months following the second closing date (the "third closing date") and will be required to increase its ownership to 100 percent between nine and 18 months following the third closing date.

Background and Basis of Presentation (Policies)	3 Months Ended
Background and Basis of Presentation (Policies)	Mar. 30, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Recent Accounting Pronouncements	Adoption of New Revenue Standard On January 1, 2018, as required, the Company adopted ASU No. 2014-09 - Revenue from Contracts with Customers (Topic 606) ("ASU 2014-09"), ASU No. 2015-14 - Revenue from Contracts with Customers (Topic 606): Deferral of the Effective Date ("ASU 2015-14"), ASU No. 2016-08 - Revenue from Contracts with Customers (Topic 606): Principal versus Agent Considerations ("ASU 2016-08"), ASU No. 2016-10 - Revenue from Contracts with Customers (Topic 606): Identifying Performance Obligations and Licensing ("ASU 2016-10"), ASU No. 2016-12 - Revenue from Contracts with Customers (Topic 606): Narrow-Scope Improvements and Practical Expedients ("ASU 2016-12") and ASU No. 2016-20 - Technical Corrections and Improvements to Topic 606, Revenue from Contracts with Customers” ("ASU 2016-20") (collectively “the New Revenue Standard”). To conform to the New Revenue Standard, the Company modified its revenue recognition policy as described below. See Note 3: ''Recent Accounting Pronouncements'' for more information. Change in Accounting Policy On January 1, 2018, the Company adopted the New Revenue Standard using the modified retrospective method, applying the guidance to all open contracts and recognized the cumulative effect adjustment of $2.1 million to retained earnings and accrued expenses as of that date. The comparative financial information has not been restated and continues to be presented under the accounting standards in effect for the respective periods. The Company applied the practical expedient and has not disclosed the revenue allocated to future shipments of partially completed contracts. Substantially all of the Company’s revenue continues to be recognized following the transfer of control of the products to the customer, which typically occurs upon shipment or delivery depending on the terms of the underlying contracts. Under the New Revenue Standard, revenue from certain product development agreements which were previously deferred as delivered, are now recognized over time. During the quarter ended March 30, 2018, revenue increased by $1.8 million due to the impact of the adoption of the New Revenue Standard. ASUs Adopted: New Revenue Standard The Company adopted the New Revenue Standard on a modified retrospective basis on January 1, 2018. The cumulative-effect adjustment related to the timing of revenue recognition on certain product development agreements recorded to beginning retained earnings as of January 1, 2018 was $2.1 million. The Company expects the ongoing impact of the New Revenue Standard to be immaterial to the consolidated financial statements. ASU No. 2017-09 - Scope of Modification Accounting ("ASU 2017-09") In May 2017, the FASB issued ASU No. 2017-09 to reduce diversity in practice and provide clarity regarding existing guidance in ASC 718, “Stock Compensation.” The amendments clarify that an entity should apply modification accounting in response to a change in the terms and conditions of an entity’s share-based payment awards unless three newly specified criteria are met. The amendments are effective for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years. The Company adopted ASU 2017-09 during the first quarter of 2018. The adoption of this standard did not have a material impact on the consolidated financial statements. ASU No 2017-07 - Compensation-Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost ("ASU 2017-07") In March 2017, the FASB issued ASU 2017-07 primarily to improve the presentation of net periodic pension cost and net periodic postretirement benefit cost. The guidance will require the net benefit cost to be split in the income statement. The service cost component will be included in operating income. The other components, including amortization of past service costs or credits, and settlement and curtailments amounts, will be reported separately outside of operating income. The amendment is effective for fiscal years beginning after December 15, 2017. The Company adopted ASU 2017-07 during the first quarter of 2018, applying the standard retrospectively to all periods presented. The adoption of this standard did not have a material impact on the current period or prior period consolidated financial statements. See Note 6: ''Balance Sheet Information'' for further information on the adoption of ASU 2017-07. ASU No. 2016-18 - Statement of Cash Flows (Topic 230): Restricted Cash (a consensus of the FASB Emerging Issues Task Force) ("ASU 2016-18") In November 2016, the FASB issued ASU 2016-18, which requires entities to include in their cash and cash-equivalent balances in the statement of cash flows those amounts that are deemed to be restricted cash and restricted cash equivalents. The ASU does not define the terms “restricted cash” and “restricted cash equivalents.” The amendments are effective for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years. The Company adopted ASU 2016-18 during the first quarter of 2018, applying the standard retrospectively to all periods presented. The adoption of this standard did not have a material impact on the current period or prior period consolidated financial statements. See Note 15: ''Supplemental Disclosures'' for further information on the adoption of ASU 2016-18. ASU No. 2016-16 - Income Taxes (Topic 740): Intra-Entity Transfers of Assets Other Than Inventory ("ASU 2016-16") In October 2016, the FASB issued ASU 2016-16, which eliminates the exception for all intra-entity sales of assets other than inventory. As a result, a reporting entity would recognize the tax expense from the sale of the asset in the seller’s tax jurisdiction when the transfer occurs, even though the pre-tax effects of that transaction are eliminated in consolidation. Any deferred tax asset that arises in the buyer’s jurisdiction would also be recognized at the time of the transfer. The new guidance does not apply to intra-entity transfers of inventory. The income tax consequences from the sale of inventory from one member of a consolidated entity to another will continue to be deferred until the inventory is sold to a third party. The amendments are effective for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years. The Company adopted ASU 2016-16 during the first quarter of 2018. The adoption of this standard did not have a material impact on the consolidated financial statements. ASU No. 2016-15 - Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments ("ASU 2016-15") In August 2016, the FASB issued ASU 2016-15, which changes how certain cash receipts and cash payments are presented and classified in the statement of cash flows. The amendments are effective for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years. The Company adopted ASU 2016-15 during the first quarter of 2018. The adoption of this standard did not have a material impact on the consolidated financial statements. ASUs Pending Adoption: ASU No. 2017-12 - Derivatives and Hedging (topic 815): Targeted Improvements to Accounting for Hedging Activities ("ASU 2017-12") In August 2017, the FASB issued ASU No. 2017-12 to better align hedge accounting with risk management strategies, and as a result, more hedging strategies will be eligible for hedge accounting. Public business entities will have until the end of the first quarter in which a hedge is designated to perform an initial assessment of a hedge’s effectiveness. After initial qualification, the new guidance permits a qualitative effectiveness assessment for certain hedges instead of a quantitative test if the company can reasonably support an expectation of high effectiveness throughout the term of the hedge. An initial quantitative test to establish that the hedge relationship is highly effective is still required. The amendments are effective for fiscal years beginning after December 15, 2018. Early adoption is permitted. The Company does not anticipate the adoption of ASU 2017-12 will have a material impact on its consolidated financial statements. ASU No. 2016-02 - Leases (Topic 842) ("ASU 2016-02") In February 2016, the FASB issued ASU 2016-02, which amends the accounting treatment for leases. Lessees (for capital and operating leases) and lessors (for sales-type leases, direct financing leases, and operating leases) must apply a modified retrospective transition approach for leases existing at, or entered into after, the beginning of the earliest comparative period presented in the financial statements. The modified retrospective approach would not require any transition accounting for leases that expired before the earliest comparative period presented. Lessees and lessors may not apply a full retrospective transition approach. The amendments are effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. Early adoption is permitted. The Company expects the adoption of this standard will result in a significant component of the Company's future minimum lease obligations as disclosed in Note 10: ''Commitments and Contingencies'' to be included on its Consolidated Balance Sheets. The Company is currently reviewing its service agreements and other arrangements to evaluate whether they meet the definition of a lease under ASU 2016-02 and what additional impact that the adoption of ASU 2016-02 may have on its consolidated financial statements.
Revenue Recognition Policy	Revenue Recognition Policy In anticipation of the adoption of the New Revenue Standard, during the quarter ended March 31, 2017, the Company developed its internal systems, processes and controls to enable it to make the estimates required by the New Revenue Standard on sales to its distributors, and was able to reliably estimate upfront the effects of returns and allowances and record revenues at the time of sales to these distributors. As a result of this change, the Company recognized an additional $155.1 million in revenue during the first quarter of 2017, which resulted in an increase of $59.0 million to income before income taxes. The Company generates revenue from sales of its semiconductor products to OEMs, electronic manufacturing service providers and distributors. The Company also generates revenue, to a much lesser extent, from product development agreements and manufacturing services provided to customers. The Company recognizes revenue when it satisfies a performance obligation in an amount reflecting the consideration to which it expects to be entitled. For sales agreements, the Company has identified the promise to transfer products, each of which are distinct, to be the performance obligation. For product development agreements, the Company has identified the completion of a service defined in the agreement to be the performance obligation. The Company applies a five-step approach in determining the amount and timing of revenue to be recognized: (1) identifying the contract with a customer, (2) identifying the performance obligations in the contract, (3) determining the transaction price, (4) allocating the transaction price to the performance obligations in the contract and (5) recognizing revenue when the performance obligation is satisfied. Substantially all of the Company’s revenue is recognized at the time control of the products transfers to the customer. Sales agreements with customers are renewable periodically and contain terms and conditions with respect to payment, delivery, warranty and supply, but typically do not require minimum purchase commitments. In the absence of a sales agreement, the Company’s standard terms and conditions apply. The Company considers the customer purchase orders, governed by sales agreements or the Company’s standard terms and conditions, to be the contract with the customer. The Company evaluates certain factors including the customer’s ability to pay (or credit risk). Most of the Company’s OEM customers negotiate pricing terms on an annual basis, while the electronic manufacturer service providers and distributors generally negotiate pricing terms on a quarterly basis. Pricing terms on product development agreements are negotiated at the beginning of a project. The Company allocates the transaction price to each distinct product based on its relative stand-alone selling price. In determining the transaction price, the Company evaluates whether the price is subject to refund or adjustment to determine the net consideration to which the Company expects to be entitled. The Company’s OEM customers do not have the right to return products, other than pursuant to the provisions of the Company’s standard warranty. Sales to distributors, however, are typically made pursuant to agreements that provide return rights with respect to discontinued or slow-moving products, referred to as stock rotation. Sales to distributors can also be subject to price adjustment on certain products, primarily for distributors with ship and credit rights. Although payment terms vary, most distributor agreements require payment within 30 days. In addition, the Company offers cash discounts to certain customers for payments received within an agreed upon time, generally ten days after shipment. The Company recognizes revenue when it satisfies a performance obligation. The Company recognizes revenue from sales agreements upon transferring control of a product to the customer. This typically occurs when products are shipped or delivered, depending on the delivery terms, or when products that are consigned at customer locations are consumed. The Company recognizes revenue from product development agreements over time based on the cost-to-cost method. Revenue recognized during the quarter ended March 30, 2018 for sales agreements was $1,372.8 million and for product development agreements was $4.8 million. Sales returns and allowances are estimated based on historical experience. Provisions for discounts and rebates to customers, estimated returns and allowances, ship and credit claims and other adjustments are provided for in the same period the related revenues are recognized, and are netted against revenues. For returns, the Company recognizes a related asset for the right to recover returned products with a corresponding reduction to cost of goods sold. The Company reviews warranty and related claims activity and records provisions, as necessary. The Company records a reserve for cash discounts as a reduction to accounts receivable and a reduction to revenues, based on the experience with each customer. Frequently, the Company receives orders with multiple delivery dates that may extend across reporting periods. Since each delivery constitutes a performance obligation, the Company allocates the transaction price of the contract to each performance obligation based on the stand-alone selling price of the products. The Company invoices the customer for each delivery upon shipment and recognizes revenues in accordance with delivery terms. As scheduled delivery dates are within one year, revenue allocated to future shipments of partially completed contracts are not disclosed. The Company has elected to record freight and handling costs associated with outbound freight after control over a product has transferred to a customer as a fulfillment cost and include it in cost of revenues. Taxes assessed by government authorities on revenue-producing transactions, including value-added and excise taxes, are presented on a net basis (excluded from revenues) in the Consolidated Statements of Operations and Comprehensive Income. The Company generally warrants that products sold to its customers will, at the time of shipment, be free from defects in workmanship and materials and conform to specifications. The Company’s standard warranty extends for a period of two years from the date of delivery, except in the case of Image Sensor products, which are warrantied for one year from the date of delivery. At the time revenue is recognized, the Company establishes an accrual for estimated warranty expenses associated with its sales, and records them as a component of the cost of revenues
Use of Estimates	Use of Estimates The preparation of financial statements in accordance with GAAP 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. Management evaluates these estimates and judgments on an ongoing basis and bases its estimates on experience, current and expected future conditions, third-party evaluations and various other assumptions that management believes are reasonable under the circumstances. Significant estimates have been used by management in conjunction with the following: (i) estimates of future payouts for customer incentives and estimates of amounts subject to allowances, returns and warranties; (ii) measurement of valuation allowances relating to inventories and trade receivables; (iii) future cash flows used to assess and test for impairment of goodwill and indefinite-lived intangible assets and long-lived assets, if applicable; (iv) assumptions surrounding future pension obligations; (v) fair values of share-based compensation and of financial instruments (including derivative financial instruments); (vi) measurement of valuation allowances against deferred tax assets, evaluations of uncertain tax positions and the impact of U.S. tax reform; and (vii) estimates and assumptions used in connection with business combinations. Actual results may differ from the estimates and assumptions used in the consolidated financial statements and related notes.
Foreign Currencies	Foreign Currencies Most of the Company’s foreign subsidiaries conduct business primarily in U.S. dollars and, as a result, utilize the dollar as their functional currency. For the remeasurement of financial statements of these subsidiaries, assets and liabilities in foreign currencies that are receivable or payable in cash are remeasured at current exchange rates, while inventories and other non-monetary assets in foreign currencies are remeasured at historical rates. Gains and losses resulting from the remeasurement of such financial statements are included in the operating results, as are gains and losses incurred on foreign currency transactions. Historically, the majority of the Company’s Japanese subsidiaries utilized Japanese Yen as their functional currency. The assets and liabilities of these subsidiaries are translated at current exchange rates, while revenues and expenses are translated at the average rates in effect for the period. The related translation gains and losses are included in other comprehensive income or loss within the Consolidated Statements of Operations and Comprehensive Income. As a result of an analysis which took into account the economic indicators of these subsidiaries from a long-term perspective, the Company changed the functional currency for some of these subsidiaries from Japanese Yen to U.S. dollars from January 1, 2018.
Cost Method Investments	Cost Method Investments Investments in equity securities that do not qualify for fair value accounting are accounted for under the cost method. Accordingly, the Company accounts for investments in companies that it does not control, or have significant influence over, under the cost method, as applicable. If a decline in the fair value of a cost method investment is determined to be other than temporary, an impairment charge is recorded, and the carrying value of the cost method investment is reduced to fair value. The Company evaluates all of its cost method investments for impairment; however, it is not required to determine the fair value of its investment unless impairment indicators are present.

Revenue and Segment Information (Tables)

3 Months Ended

Mar. 30, 2018

Segment Reporting [Abstract]

Disaggregation of Revenue

The following table disaggregates the Company’s segment revenue into geographic locations and sales channels (in millions):



	Reportable Segments
	Quarter Ended March 30, 2018
	Power Solutions Group		Analog Solutions Group		Image Sensor Group		Total
Geographic Location
United States	$	94.5	$	78.2	$	26.5	$	199.2
United Kingdom	118.6		79.1		35.9		233.6
Hong Kong	205.2		122.5		33.2		360.9
Singapore	228.4		161.2		43.3		432.9
Other	45.9		55.2		49.9		151.0
Total	$	692.6	$	496.2	$	188.8	$	1,377.6

Sales Channel
OEM	$	198.1	$	207.6	$	64.5	$	470.2
Distributor	452.6		254.1		114.9		821.6
Electronic Manufacturing Service Provider	41.9		34.5		9.4		85.8
Total	$	692.6	$	496.2	$	188.8	$	1,377.6

Revenues and Gross Profit From Reportable Segments

Revenues and gross profit for the Company’s reportable segments were as follows (in millions):



	Power Solutions Group		Analog Solutions Group		Image Sensor Group		Total
For the quarter ended March 30, 2018:
Revenues from external customers	$	692.6	$	496.2	$	188.8	$	1,377.6
Gross profit	$	239.2	$	206.8	$	81.7	$	527.7
For the quarter ended March 31, 2017:
Revenues from external customers	$	743.8	$	503.6	$	189.3	$	1,436.7
Gross profit	$	244.0	$	209.3	$	67.4	$	520.7

Reconciliation of Operating Profit (Loss) from Segments to Consolidated

Reconciliations of segment gross profit to consolidated gross profit are as follows (in millions):



	Quarter Ended
	March 30, 2018			March 31, 2017
Gross profit for reportable segments	$	527.7		$	520.7
Less: unallocated manufacturing costs	(10.3		)	(17.6		)
Consolidated gross profit	$	517.4		$	503.1

Summary of Property, Plant and Equipment by Geographic Location

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



	As of
	March 30, 2018		December 31, 2017
United States	$	546.9	$	547.9
Korea	392.8		380.5
Malaysia	229.1		230.0
Philippines	456.0		439.5
China	255.1		246.0
Other	456.5		435.2
	$	2,336.4	$	2,279.1

Goodwill and Intangible Assets (Tables)

3 Months Ended

Mar. 30, 2018

Goodwill and Intangible Assets Disclosure [Abstract]

Summary of Goodwill by Reportable Segment

The following table summarizes goodwill by reportable segment (in millions):



	As of March 30, 2018							As of December 31, 2017
	Goodwill		Accumulated Impairment Losses			Carrying Value		Goodwill		Accumulated Impairment Losses			Carrying Value
Reportable Segment:
Power Solutions Group	$	432.2	$	(28.6	)	$	403.6	$	432.2	$	(28.6	)	$	403.6
Analog Solutions Group	836.7		(418.9		)	417.8		836.7		(418.9		)	417.8
Image Sensor Group	95.5		—			95.5		95.5		—			95.5
	$	1,364.4	$	(447.5	)	$	916.9	$	1,364.4	$	(447.5	)	$	916.9

Summary of Intangible Assets, Net

Intangible assets, net, were as follows (in millions):



	As of March 30, 2018
	Original Cost		Accumulated Amortization			Accumulated Impairment Losses			Carrying Value
Intellectual property	$	13.9	$	(12.0	)	$	(0.4	)	$	1.5
Customer relationships	555.9		(336.1		)	(20.1		)	199.7
Patents	43.7		(27.1		)	(13.7		)	2.9
Developed technology	657.6		(297.2		)	(2.6		)	357.8
Trademarks	17.2		(12.6		)	(1.1		)	3.5
Backlog	3.3		(3.3		)	—			—
Favorable Leases	1.7		(1.7		)	—			—
IPRD	54.5		—			(19.0		)	35.5
Total intangibles	$	1,347.8	$	(690.0	)	$	(56.9	)	$	600.9



	As of December 31, 2017
	Original Cost		Accumulated Amortization			Accumulated Impairment Losses			Carrying Value
Intellectual property	$	13.9	$	(11.8	)	$	(0.4	)	$	1.7
Customer relationships	555.9		(328.5		)	(20.1		)	207.3
Patents	43.7		(26.8		)	(13.7		)	3.2
Developed technology	657.6		(278.2		)	(2.6		)	376.8
Trademarks	17.2		(12.4		)	(1.1		)	3.7
Backlog	3.3		(3.3		)	—			—
Favorable Leases	1.7		(1.6		)	—			0.1
IPRD	54.5		—			(19.0		)	35.5
Total intangibles	$	1,347.8	$	(662.6	)	$	(56.9	)	$	628.3

Summary of Amortization Expense

Amortization expense for intangible assets, with the exception of the $35.5 million of IPRD assets that will be amortized once the corresponding projects have been completed, is expected to be as follows for remainder of 2018, each of the next four years, and thereafter (in millions):



Period	Amortization Expense
Remainder of 2018	$	81.7
2019	99.8
2020	84.9
2021	70.0
2022	57.9
Thereafter	171.1
Total amortization expense	$	565.4

Restructuring, Asset Impairments and Other, Net (Tables)

3 Months Ended

Mar. 30, 2018

Restructuring Charges [Abstract]

Schedule of Activity Included in Restructuring, Asset Impairments, and Other, Net



	Restructuring		Asset Impairments		Other ⁽¹⁾		Total
Quarter ended March 30, 2018
Other	—		—		0.4		0.4
Total	$	—	$	—	$	0.4	$	0.4

⁽¹⁾ Includes amounts related to immaterial adjustments which are not considered to be significant.

Schedule of Changes in Accrued Restructuring Reserve

A summary of changes in accrued restructuring charges are as follows (in millions):



	As of December 31, 2017		Charges		Usage			As of March 30, 2018
Employee separation charges	$	1.9	$	0.4	$	(1.2	)	$	1.1
Costs to exit	0.2		—		—			0.2
Total	$	2.1	$	0.4	$	(1.2	)	$	1.3

Balance Sheet Information (Tables)

3 Months Ended

Mar. 30, 2018

Balance Sheet Related Disclosures [Abstract]

Supplemental Balance Sheet Information

Certain significant amounts included in the Company's Consolidated Balance Sheets consist of the following (in millions):



	As of
	March 30, 2018			December 31, 2017
Receivables, net:
Accounts receivable	$	700.3		$	704.2
Less: Allowance for doubtful accounts	(3.4		)	(2.7		)
	$	696.9		$	701.5
Inventories:
Raw materials	$	119.9		$	117.7
Work in process	711.9			660.8
Finished goods	328.2			311.0
	$	1,160.0		$	1,089.5
Property, plant and equipment, net:
Land	$	148.5		$	148.4
Buildings	751.7			744.0
Machinery and equipment	3,582.7			3,454.6
Total property, plant and equipment	4,482.9			4,347.0
Less: Accumulated depreciation	(2,146.5		)	(2,067.9		)
	$	2,336.4		$	2,279.1
Accrued expenses:
Accrued payroll and related benefits	$	174.3		$	201.8
Sales related reserves	284.4			280.0
Income taxes payable	13.6			29.9
Other	113.5			101.1
	$	585.8		$	612.8

Schedule of Product Warranty Liability

The activity related to the Company's warranty reserves was as follows (in millions):



	Quarter Ended
	March 30, 2018			March 31, 2017
Beginning Balance	$	8.0		$	8.8
Provision	(0.4		)	0.8
Usage	(0.2		)	(1.8		)
Ending Balance	$	7.4		$	7.8

Schedule of Net Benefit Costs

The components of the Company's net periodic pension expense are as follows (in millions):



	Quarter Ended
	March 30, 2018			March 31, 2017
Service cost	$	2.5		$	2.3
Interest cost	1.2			1.0
Expected return on plan assets	(1.6		)	(1.3		)
Total net periodic pension cost	$	2.1		$	2.0

Long-Term Debt (Tables)

3 Months Ended

Mar. 30, 2018

Debt Disclosure [Abstract]

Long-Term Debt

The Company's long-term debt consists of the following (annualized interest rates, in millions):



	As of
	March 30, 2018			December 31, 2017
Amended Credit Agreement:
Revolving Credit Facility due 2021, interest payable monthly at 3.38% and 3.07%, respectively	$	400.0		$	400.0
Term Loan “B” Facility due 2023, interest payable monthly at 3.88% and 3.57%, respectively	1,204.5			1,204.5
1.00% Notes due 2020 (1)	690.0			690.0
1.625% Notes due 2023 (2)	575.0			575.0
Note payable to SMBC due 2016 through 2018, interest payable quarterly at 0% and 3.09%, respectively (3)	—			122.7
U.S. real estate mortgages payable monthly through 2019 at an average rate of 3.12% and 3.12%, respectively (4)	33.1			34.2
Philippine term loans due 2017 through 2020, interest payable quarterly at 4.15% and 3.73%, respectively (7)	29.4			32.4
Loan with Singapore bank, interest payable weekly at 3.13% and 2.80%, respectively (6) (10)	25.0			25.0
Loan with Hong Kong bank, interest payable weekly at 3.13% and 2.78%, respectively (6) (10)	25.0			25.0
Malaysia revolving line of credit, interest payable quarterly at 3.76% and 3.14%, respectively (7) (10)	25.0			25.0
Vietnam revolving line of credit, interest payable quarterly at an average rate of 3.14% and 2.88%, respectively (7) (10)	22.5			24.9
Loan with Philippine bank due 2017 through 2019, interest payable quarterly at 4.78% and 4.20%, respectively (5)	8.2			9.4
Loan with Japanese bank due 2017 through 2020, interest payable quarterly at 1.10% (7)	2.6			2.7
Capital lease obligations	3.2			4.2
Gross long-term debt, including current maturities	3,043.5			3,175.0
Less: Debt discount (8)	(169.5		)	(178.8		)
Less: Debt issuance costs (9)	(42.4		)	(44.4		)
Net long-term debt, including current maturities	2,831.6			2,951.8
Less: Current maturities	(747.2		)	(248.1		)
Net long-term debt	2,084.4			2,703.7

_______________________


(1)	Interest is payable on June 1 and December 1 of each year at 1.00% annually.


(2)	Interest is payable on April 15 and October 15 of each year at 1.625% annually.


(3)	This loan represented SCI LLC's non-collateralized loan with SMBC, which was guaranteed by the Company.


(4)	Debt arrangement collateralized by real estate, including certain of the Company’s facilities in California, Oregon and Idaho.


(5)	Debt collateralized by equipment.


(6)	Debt arrangement collateralized by certain accounts receivable.


(7)	Non-collateralized debt arrangement.


(8)	Debt discount of $57.0 million and $61.9 million for the 1.00% Notes, $100.5 million and $104.3 million for the 1.625% Notes and $12.0 million and $12.5 million for the Term Loan "B" Facility as of March 30, 2018 and December 31, 2017, respectively.


(9)	Debt issuance costs of $8.0 million and $8.6 million for the 1.00% Notes, $9.6 million and $10.0 million for the 1.625% Notes and $24.8 million and $25.8 million for the Term Loan "B" Facility as of March 30, 2018 and December 31, 2017, respectively.


(10)	The Company has historically renewed these arrangements annually.

Annual Maturities Relating To Long-Term Debt

Expected maturities relating to the Company’s long-term debt (including current maturities) as of March 30, 2018 are as follows (in millions):



Period	Expected Maturities
Remainder of 2018	$	806.4
2019	47.7
2020	9.8
2021	400.0
2022	—
Thereafter	1,779.6
Total	$	3,043.5

- 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 FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21475-112644

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(e),(f))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21538-112644

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
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-URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21506-112644

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28541-108399

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21521-112644

+ Details

Earnings Per Share and Equity (Tables)

3 Months Ended

Mar. 30, 2018

Earnings Per Share [Abstract]

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, 2018		March 31, 2017
Net income attributable to ON Semiconductor Corporation	$	139.6	$	78.2
Basic weighted-average common shares outstanding	425.9		419.8
Dilutive effect of share-based awards	5.7		6.0
Dilutive effect of convertible notes	12.6		—
Diluted weighted-average common shares outstanding	444.2		425.8

Net income per common share attributable to ON Semiconductor Corporation:
Basic	$	0.33	$	0.19
Diluted	$	0.31	$	0.18

Share-Based Compensation (Tables)

3 Months Ended

Mar. 30, 2018

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Summary Of Share-Based Compensation Expense



	Quarter Ended
	March 30, 2018		March 31, 2017
Cost of revenues	$	1.6	$	1.5
Research and development	3.2		2.9
Selling and marketing	3.2		2.8
General and administrative	10.4		7.9
Share-based compensation expense before income taxes	$	18.4	$	15.1
Related income tax benefits ⁽¹⁾	3.9		5.3
Share-based compensation expense, net of taxes	$	14.5	$	9.8


⁽¹⁾	Tax benefit calculated using the federal statutory rate of 21% and 35% for the quarters ended March 30, 2018 and March 31, 2017, respectively.

Schedule of Share-based Compensation, Stock Options, Activity

A summary of stock option transactions for all stock option plans is as follows (in millions, except per share and contractual term data):



	Quarter Ended March 30, 2018
	Number of Shares		Weighted-Average Exercise Price Per Share		Weighted-Average Remaining Contractual Term (in years)	Aggregate Intrinsic Value (In-The-Money)
Outstanding at December 31, 2017	1.1		$	6.95
Granted	—		—
Exercised	(0.6	)	6.79
Canceled	—		—
Outstanding at March 30, 2018	0.5		$	7.11	1.18	$	9.2

Exercisable at March 30, 2018	0.5		$	7.11	1.18	$	9.2

Summary Of Restricted Stock Units Transactions

A summary of the RSU transactions for the quarter ended March 30, 2018 is as follows (in millions, except per share data):



	Number of Shares		Weighted-Average Grant Date Fair Value Per Share
Non-vested RSUs at December 31, 2017	9.8		$	12.63
Granted	2.7		24.43
Released	(2.6	)	12.18
Forfeited	(0.1	)	13.49
Non-vested RSUs at March 30, 2018	9.8		15.94

Commitments and Contingencies (Tables)

3 Months Ended

Mar. 30, 2018

Commitments and Contingencies Disclosure [Abstract]

Summary of Operating Leases Future Minimum Payments Receivable

The following represents future minimum lease obligations under non-cancelable operating leases as of March 30, 2018 (in millions):



Remainder of 2018	$	29.1
2019	33.8
2020	23.7
2021	19.1
2022	14.6
Thereafter	55.9
Total ⁽¹⁾	$	176.2

⁽¹⁾ Excludes $17.5 million of expected sublease income.

Fair Value Measurements (Tables)

3 Months Ended

Mar. 30, 2018

Fair Value Disclosures [Abstract]

Summary of Fair Value of Assets and Liabilities

The following table summarizes the Company's financial assets and liabilities, excluding pension assets, measured at fair value on a recurring basis (in millions):



			Fair Value Hierarchy
Description	As of March 30, 2018		Level 1		Level 2		Level 3
Assets:
Cash and cash equivalents:
Demand and time deposits	$	14.5	$	14.5	$	—	$	—
Money market funds	0.4		0.4		—		—



			Fair Value Hierarchy
Description	As of December 31, 2017		Level 1		Level 2		Level 3
Assets:
Cash and cash equivalents:
Demand and time deposits	$	71.7	$	71.7	$	—	$	—
Money market funds	0.2		0.2		—		—
Liabilities:
Contingent consideration	$	2.3	$	—	$	—	$	2.3

Summary of Fair Value, by Balance Sheet Grouping

The carrying amounts and fair values of the Company’s long-term borrowings (excluding capital lease obligations, real estate mortgages and equipment financing) are as follows (in millions):



	As of March 30, 2018				As of December 31, 2017
	Carrying Amount		Fair Value		Carrying Amount		Fair Value
Long-term debt, including current portion
Convertible notes	$	1,089.9	$	1,749.0	$	1,080.1	$	1,596.7
Long-term debt	$	1,705.6	$	1,700.9	$	1,833.2	$	1,845.4

Financial Instruments (Tables)

3 Months Ended

Mar. 30, 2018

Investments, All Other Investments [Abstract]

Schedule of Net Foreign Exchange Positions

The following summarizes the Company’s net foreign exchange positions in U.S. dollars (in millions):



	As of March 30, 2018					As of December 31, 2017
	Buy (Sell)			Notional Amount		Buy (Sell)			Notional Amount
Euro	$	(29.0	)	$	29.0	$	(22.9	)	$	22.9
Japanese Yen	(15.9		)	15.9		(40.0		)	40.0
Philippine Peso	28.9			28.9		26.4			26.4
Other Currencies - Buy	35.4			35.4		30.9			30.9
Other Currencies - Sell	(6.4		)	6.4		(10.3		)	10.3
	$	13.0		$	115.6	$	(15.9	)	$	130.5

Changes in Accumulated Other Comprehensive Loss (Tables)

3 Months Ended

Mar. 30, 2018

Equity [Abstract]

Schedule of Accumulated Other Comprehensive Loss

Amounts comprising the Company's accumulated other comprehensive loss and reclassifications are as follows (in millions):



	Foreign Currency Translation Adjustments			Effects of Cash Flow Hedges		Total
Balance as of December 31, 2017	$	(43.2	)	$	2.6	$	(40.6	)
Other comprehensive income prior to reclassifications	2.4			3.7		6.1
Amounts reclassified from accumulated other comprehensive loss	—			0.1		0.1
Net current period other comprehensive income (1)	2.4			3.8		6.2
Balance as of March 30, 2018	$	(40.8	)	$	6.4	$	(34.4	)

(1) Effects of cash flow hedges are net of tax of $1.0 million of tax expense for the quarter ended March 30, 2018.

Amounts which were reclassified from accumulated other comprehensive loss to the Company's Consolidated Statements of Operations and Comprehensive Income (net of tax of zero, in millions):



	Amounts Reclassified from Accumulated Other Comprehensive Loss
	Quarter Ended
	March 30, 2018			March 31, 2017		Statements of Operations and Comprehensive Income Line Item
Interest rate swaps	(0.1		)	0.2		Other income and expense
Total reclassifications	$	(0.1	)	$	0.2

Supplemental Disclosures (Tables)

3 Months Ended

Mar. 30, 2018

Supplemental Cash Flow Elements [Abstract]

Supplemental Disclosures

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



	Quarter Ended
	March 30, 2018			March 31, 2017
Non-cash activities:
Capital expenditures in accounts payable and other liabilities	$	209.1		$	125.3
Cash (received) paid for:
Interest income	$	(0.9	)	$	(0.6	)
Interest expense	$	16.6		$	27.6
Income taxes	$	19.1		$	18.4

Summary of Restrictions on Cash and Cash Equivalents

The following is a reconciliation of the captions in the Consolidated Balance Sheets to the Consolidated Statements of Cash Flows (in millions):



	As of
	March 30, 2018		December 31, 2017		March 31, 2017		December 31, 2016
Consolidated Balance Sheets:
Cash and cash equivalents	$	924.9	$	949.2	$	728.9	$	1,028.1
Restricted cash (included in other current assets)	17.4		17.4		17.7		17.7
Cash, cash equivalents and restricted cash in Consolidated Statements of Cash Flows	$	942.3	$	966.6	$	746.6	$	1,045.8

Schedule of Cash and Cash Equivalents

The following is a reconciliation of the captions in the Consolidated Balance Sheets to the Consolidated Statements of Cash Flows (in millions):



	As of
	March 30, 2018		December 31, 2017		March 31, 2017		December 31, 2016
Consolidated Balance Sheets:
Cash and cash equivalents	$	924.9	$	949.2	$	728.9	$	1,028.1
Restricted cash (included in other current assets)	17.4		17.4		17.7		17.7
Cash, cash equivalents and restricted cash in Consolidated Statements of Cash Flows	$	942.3	$	966.6	$	746.6	$	1,045.8

Background and Basis of Presentation (Details) $ in Millions	3 Months Ended
	Mar. 30, 2018 USD ($) segment	Mar. 31, 2017 USD ($)	Jan. 01, 2018 USD ($)	Dec. 31, 2017 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Number of operating segments \| segment	3
Number of reportable segments \| segment	3
Accumulated earnings	$ 491.7			$ 351.5
Revenues from external customers	1,377.6	$ 1,436.7
Income before income taxes	$ 156.9	115.0
Distributors, repayment period	30 days
Repayment period of account receivable, cash discount, after the date of shipment	10 days
Standard product warranty, period from the date of shipment	2 years
Sales Agreements
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Contract with customer, revenue recognized	$ 1,372.8
Product Development Agreements
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Contract with customer, revenue recognized	4.8
Difference between Revenue Guidance in Effect before and after Topic 606 \| Accounting Standards Update 2014-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Accumulated earnings			$ 2.1
Revenues from external customers	$ 1.8	155.1
Income before income taxes		$ 59.0
Image Sensor Group
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Standard product warranty, period from the date of shipment	1 year

Revenue and Segment Information - Disaggregation of Revenue (Details) $ in Millions	3 Months Ended
	Mar. 30, 2018 USD ($) segment
Segment Reporting [Abstract]
Number of reportable segments \| segment	3
Segment Reporting Information [Line Items]
Revenues from external customers	$ 1,377.6
United States
Segment Reporting Information [Line Items]
Revenues from external customers	199.2
United Kingdom
Segment Reporting Information [Line Items]
Revenues from external customers	233.6
Hong Kong
Segment Reporting Information [Line Items]
Revenues from external customers	360.9
Singapore
Segment Reporting Information [Line Items]
Revenues from external customers	432.9
Other
Segment Reporting Information [Line Items]
Revenues from external customers	151.0
Power Solutions Group
Segment Reporting Information [Line Items]
Revenues from external customers	692.6
Power Solutions Group \| United States
Segment Reporting Information [Line Items]
Revenues from external customers	94.5
Power Solutions Group \| United Kingdom
Segment Reporting Information [Line Items]
Revenues from external customers	118.6
Power Solutions Group \| Hong Kong
Segment Reporting Information [Line Items]
Revenues from external customers	205.2
Power Solutions Group \| Singapore
Segment Reporting Information [Line Items]
Revenues from external customers	228.4
Power Solutions Group \| Other
Segment Reporting Information [Line Items]
Revenues from external customers	45.9
Analog Solutions Group
Segment Reporting Information [Line Items]
Revenues from external customers	496.2
Analog Solutions Group \| United States
Segment Reporting Information [Line Items]
Revenues from external customers	78.2
Analog Solutions Group \| United Kingdom
Segment Reporting Information [Line Items]
Revenues from external customers	79.1
Analog Solutions Group \| Hong Kong
Segment Reporting Information [Line Items]
Revenues from external customers	122.5
Analog Solutions Group \| Singapore
Segment Reporting Information [Line Items]
Revenues from external customers	161.2
Analog Solutions Group \| Other
Segment Reporting Information [Line Items]
Revenues from external customers	55.2
Image Sensor Group
Segment Reporting Information [Line Items]
Revenues from external customers	188.8
Image Sensor Group \| United States
Segment Reporting Information [Line Items]
Revenues from external customers	26.5
Image Sensor Group \| United Kingdom
Segment Reporting Information [Line Items]
Revenues from external customers	35.9
Image Sensor Group \| Hong Kong
Segment Reporting Information [Line Items]
Revenues from external customers	33.2
Image Sensor Group \| Singapore
Segment Reporting Information [Line Items]
Revenues from external customers	43.3
Image Sensor Group \| Other
Segment Reporting Information [Line Items]
Revenues from external customers	49.9
OEM
Segment Reporting Information [Line Items]
Revenues from external customers	470.2
OEM \| Power Solutions Group
Segment Reporting Information [Line Items]
Revenues from external customers	198.1
OEM \| Analog Solutions Group
Segment Reporting Information [Line Items]
Revenues from external customers	207.6
OEM \| Image Sensor Group
Segment Reporting Information [Line Items]
Revenues from external customers	64.5
Distributor
Segment Reporting Information [Line Items]
Revenues from external customers	821.6
Distributor \| Power Solutions Group
Segment Reporting Information [Line Items]
Revenues from external customers	452.6
Distributor \| Analog Solutions Group
Segment Reporting Information [Line Items]
Revenues from external customers	254.1
Distributor \| Image Sensor Group
Segment Reporting Information [Line Items]
Revenues from external customers	114.9
Electronic Manufacturing Service Provider
Segment Reporting Information [Line Items]
Revenues from external customers	85.8
Electronic Manufacturing Service Provider \| Power Solutions Group
Segment Reporting Information [Line Items]
Revenues from external customers	41.9
Electronic Manufacturing Service Provider \| Analog Solutions Group
Segment Reporting Information [Line Items]
Revenues from external customers	34.5
Electronic Manufacturing Service Provider \| Image Sensor Group
Segment Reporting Information [Line Items]
Revenues from external customers	$ 9.4

Revenue and Segment Information - Segment Information Of Revenues, Gross Profit And Operating Income (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 30, 2018	Mar. 31, 2017
Segment Reporting Information [Line Items]
Revenues from external customers	$ 1,377.6	$ 1,436.7
Gross profit	527.7	520.7
Power Solutions Group
Segment Reporting Information [Line Items]
Revenues from external customers	692.6	743.8
Gross profit	239.2	244.0
Analog Solutions Group
Segment Reporting Information [Line Items]
Revenues from external customers	496.2	503.6
Gross profit	206.8	209.3
Image Sensor Group
Segment Reporting Information [Line Items]
Revenues from external customers	188.8	189.3
Gross profit	$ 81.7	$ 67.4

Revenue and Segment Information - Reconciliations Of Segment Gross Profit And Segment Operating Income (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 30, 2018	Mar. 31, 2017
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Gross profit for reportable segments	$ 527.7	$ 520.7
Gross profit	517.4	503.1
Operating Segments
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Gross profit for reportable segments	527.7	520.7
Less: unallocated manufacturing costs
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Less: unallocated manufacturing costs	$ (10.3)	$ (17.6)

Revenue and Segment Information - Summary of Property, Plant and Equipment by Geographic Location (Details) - USD ($) $ in Millions	Mar. 30, 2018	Dec. 31, 2017
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment, net	$ 2,336.4	$ 2,279.1
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment, net	546.9	547.9
Korea
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment, net	392.8	380.5
Malaysia
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment, net	229.1	230.0
Philippines
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment, net	456.0	439.5
China
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment, net	255.1	246.0
Other
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment, net	$ 456.5	$ 435.2

Recent Accounting Pronouncements Narrative (Details) - USD ($) $ in Millions	Mar. 30, 2018	Jan. 01, 2018	Dec. 31, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Cumulative effect	$ 491.7		$ 351.5
Difference between Revenue Guidance in Effect before and after Topic 606 \| Accounting Standards Update 2014-09
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Cumulative effect		$ 2.1

Goodwill and Intangible Assets - Summary of Goodwill by Reportable Segment (Details) - USD ($) $ in Millions	Mar. 30, 2018	Dec. 31, 2017
Goodwill
Goodwill	$ 1,364.4	$ 1,364.4
Accumulated Impairment Losses	(447.5)	(447.5)
Carrying Value	916.9	916.9
Power Solutions Group
Goodwill
Goodwill	432.2	432.2
Accumulated Impairment Losses	(28.6)	(28.6)
Carrying Value	403.6	403.6
Analog Solutions Group
Goodwill
Goodwill	836.7	836.7
Accumulated Impairment Losses	(418.9)	(418.9)
Carrying Value	417.8	417.8
Image Sensor Group
Goodwill
Goodwill	95.5	95.5
Accumulated Impairment Losses	0.0	0.0
Carrying Value	$ 95.5	$ 95.5

Goodwill and Intangible Assets - Narrative (Details) - USD ($)	3 Months Ended
	Mar. 30, 2018	Mar. 31, 2017	Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Increase (decrease) in goodwill	$ 0
Amortization of acquisition-related intangible assets	27,400,000	$ 29,100,000
Intangible assets, net	600,900,000		$ 628,300,000
IPRD
Finite-Lived Intangible Assets [Line Items]
Intangible assets, net	$ 35,500,000		$ 35,500,000

Goodwill and Intangible Assets - Summary of Intangible Assets, Net (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 30, 2018	Dec. 31, 2017
Intangible Assets, Net
Original Cost	$ 1,347.8	$ 1,347.8
Accumulated Amortization	(690.0)	(662.6)
Accumulated Impairment Losses	(56.9)	(56.9)
Carrying Value	600.9	628.3
Intellectual property
Intangible Assets, Net
Original Cost	13.9	13.9
Accumulated Amortization	(12.0)	(11.8)
Accumulated Impairment Losses	(0.4)	(0.4)
Carrying Value	1.5	1.7
Customer relationships
Intangible Assets, Net
Original Cost	555.9	555.9
Accumulated Amortization	(336.1)	(328.5)
Accumulated Impairment Losses	(20.1)	(20.1)
Carrying Value	199.7	207.3
Patents
Intangible Assets, Net
Original Cost	43.7	43.7
Accumulated Amortization	(27.1)	(26.8)
Accumulated Impairment Losses	(13.7)	(13.7)
Carrying Value	2.9	3.2
Developed technology
Intangible Assets, Net
Original Cost	657.6	657.6
Accumulated Amortization	(297.2)	(278.2)
Accumulated Impairment Losses	(2.6)	(2.6)
Carrying Value	357.8	376.8
Trademarks
Intangible Assets, Net
Original Cost	17.2	17.2
Accumulated Amortization	(12.6)	(12.4)
Accumulated Impairment Losses	(1.1)	(1.1)
Carrying Value	3.5	3.7
Backlog
Intangible Assets, Net
Original Cost	3.3	3.3
Accumulated Amortization	(3.3)	(3.3)
Accumulated Impairment Losses	0.0	0.0
Carrying Value	0.0	0.0
Favorable Leases
Intangible Assets, Net
Original Cost	1.7	1.7
Accumulated Amortization	(1.7)	(1.6)
Accumulated Impairment Losses	0.0	0.0
Carrying Value	0.0	0.1
IPRD
Intangible Assets, Net
Original Cost	54.5	54.5
Accumulated Amortization	0.0	0.0
Accumulated Impairment Losses	(19.0)	(19.0)
Carrying Value	$ 35.5	$ 35.5

Goodwill and Intangible Assets - Summary of Amortization Expense (Details) $ in Millions	Mar. 30, 2018 USD ($)
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule
Remainder of 2018	$ 81.7
2019	99.8
2020	84.9
2021	70.0
2022	57.9
Thereafter	171.1
Total amortization expense	$ 565.4

Restructuring, Asset Impairments and Other, Net - Schedule of Activity Included in Restructuring, Asset Impairments, and Other, Net (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 30, 2018	Mar. 31, 2017
Restructuring Cost and Reserve [Line Items]
Restructuring	$ 0.0
Non-cash asset impairment charges	0.0
Other	0.4
Total	0.4	$ 0.5
Other
Restructuring Cost and Reserve [Line Items]
Restructuring	0.0
Non-cash asset impairment charges	0.0
Other	0.4
Total	$ 0.4

Restructuring, Asset Impairments and Other, Net - Summary of Changes in Accrued Restructuring Charges (Details) $ in Millions	3 Months Ended
	Mar. 30, 2018 USD ($)
Restructuring Reserve [Roll Forward]
Balance at Beginning of Period	$ 2.1
Restructuring Charges	0.4
Usage	(1.2)
Balance at End of Period	1.3
Employee separation charges
Restructuring Reserve [Roll Forward]
Balance at Beginning of Period	1.9
Restructuring Charges	0.4
Usage	(1.2)
Balance at End of Period	1.1
Costs to exit
Restructuring Reserve [Roll Forward]
Balance at Beginning of Period	0.2
Restructuring Charges	0.0
Usage	0.0
Balance at End of Period	$ 0.2

Balance Sheet Information - Schedule of Balance Sheet Information (Details) - USD ($) $ in Millions	Mar. 30, 2018	Dec. 31, 2017
Receivables, net:
Accounts receivable	$ 700.3	$ 704.2
Less: Allowance for doubtful accounts	(3.4)	(2.7)
Receivables, net	696.9	701.5
Inventories:
Raw materials	119.9	117.7
Work in process	711.9	660.8
Finished goods	328.2	311.0
Inventories	1,160.0	1,089.5
Property, plant and equipment, net:
Land	148.5	148.4
Buildings	751.7	744.0
Machinery and equipment	3,582.7	3,454.6
Total property, plant and equipment	4,482.9	4,347.0
Less: Accumulated depreciation	(2,146.5)	(2,067.9)
Property, plant and equipment, net	2,336.4	2,279.1
Accrued expenses:
Accrued payroll and related benefits	174.3	201.8
Sales related reserves	284.4	280.0
Income taxes payable	13.6	29.9
Other	113.5	101.1
Accrued expenses	$ 585.8	$ 612.8

Balance Sheet Information - Narrative (Details) - USD ($) $ in Millions	Mar. 30, 2018	Jan. 31, 2018	Dec. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets held-for-sale	$ 1.4		$ 5.3
Accrued pension liability	115.0		109.3
Current portion accrued pension liability	$ 0.3		$ 0.2
Disposal Group, Disposed of by Sale, Not Discontinued Operations
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Proceeds from sale of assets held-for-sale		$ 5.5

Balance Sheet Information - Warranty Reserves (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 30, 2018	Mar. 31, 2017
Warranty Reserves
Beginning Balance	$ 8.0	$ 8.8
Provision	(0.4)	0.8
Usage	(0.2)	(1.8)
Ending Balance	$ 7.4	$ 7.8

Balance Sheet Information - Periodic Pension Expense (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 30, 2018	Mar. 31, 2017
Balance Sheet Related Disclosures [Abstract]
Service cost	$ 2.5	$ 2.3
Interest cost	1.2	1.0
Expected return on plan assets	(1.6)	(1.3)
Total net periodic pension cost	$ 2.1	$ 2.0

Long-Term Debt - Schedule of Long Term Debt (Details) - USD ($) $ in Millions	Mar. 30, 2018	Dec. 31, 2017	Jun. 08, 2015
Debt Instrument [Line Items]
Carrying Amount	$ 3,043.5	$ 3,175.0
Capital lease obligations	113.9
Debt discount	(169.5)	(178.8)
Debt issuance costs	(42.4)	(44.4)
Net long-term debt, including current maturities	2,831.6	2,951.8
Less: Current maturities	(747.2)	(248.1)
Net long-term debt	2,084.4	2,703.7
Debt discount	169.5	178.8
Debt issuance costs	42.4	44.4
Revolving Credit Facility due 2021, interest payable monthly at 3.38% and 3.07%, respectively
Debt Instrument [Line Items]
Carrying Amount	$ 400.0	$ 400.0
Debt instrument, interest rate (as a percent)	3.38%	3.07%
Term Loan “B” Facility due 2023, interest payable monthly at 3.88% and 3.57%, respectively
Debt Instrument [Line Items]
Carrying Amount	$ 1,204.5	$ 1,204.5
Debt discount	(12.0)	(12.5)
Debt issuance costs	$ (24.8)	$ (25.8)
Debt instrument, interest rate (as a percent)	3.88%	3.57%
Debt discount	$ 12.0	$ 12.5
Debt issuance costs	24.8	25.8
Note payable to SMBC due 2016 through 2018, interest payable quarterly at 3.09% and 2.75%, respectively
Debt Instrument [Line Items]
Carrying Amount	$ 0.0	$ 122.7
Debt instrument, interest rate (as a percent)	0.00%	3.09%
U.S. real estate mortgages payable monthly through 2019 at an average rate of 3.12% and 3.12%, respectively
Debt Instrument [Line Items]
Carrying Amount	$ 33.1	$ 34.2
Debt instrument, interest rate (as a percent)	3.12%	3.12%
Philippine term loans due 2017 through 2020, interest payable quarterly at 4.15% and 3.73%, respectively
Debt Instrument [Line Items]
Carrying Amount	$ 29.4	$ 32.4
Debt instrument, interest rate (as a percent)	4.15%	3.73%
Loan with Singapore bank, interest payable weekly at 3.13% and 2.80%, respectively
Debt Instrument [Line Items]
Carrying Amount	$ 25.0	$ 25.0
Debt instrument, interest rate (as a percent)	3.13%	2.80%
Loan with Hong Kong bank, interest payable weekly at 3.13% and 2.78%, respectively
Debt Instrument [Line Items]
Carrying Amount	$ 25.0	$ 25.0
Debt instrument, interest rate (as a percent)	3.13%	2.78%
Malaysia revolving line of credit, interest payable quarterly at 3.76% and 3.14%, respectively
Debt Instrument [Line Items]
Carrying Amount	$ 25.0	$ 25.0
Debt instrument, interest rate (as a percent)	3.76%	3.14%
Vietnam revolving line of credit, interest payable quarterly at an average rate of 3.14% and 2.88%, respectively
Debt Instrument [Line Items]
Carrying Amount	$ 22.5	$ 24.9
Debt instrument, interest rate (as a percent)	3.14%	2.88%
Loan with Philippine bank due 2017 through 2019, interest payable quarterly at 4.78% and 4.20%, respectively
Debt Instrument [Line Items]
Carrying Amount	$ 8.2	$ 9.4
Debt instrument, interest rate (as a percent)	4.78%	4.20%
Loan with Japanese bank due 2016 through 2020, interest payable quarterly at 1.10%
Debt Instrument [Line Items]
Carrying Amount	$ 2.6	$ 2.7
Debt instrument, interest rate (as a percent)	1.10%
Capital lease obligations
Debt Instrument [Line Items]
Capital lease obligations	$ 3.2	4.2
1.00% Notes
Debt Instrument [Line Items]
Debt instrument, interest rate (as a percent)	1.00%
1.00% Notes \| Convertible Debt
Debt Instrument [Line Items]
Carrying Amount	$ 690.0	690.0
Debt discount	(57.0)	(61.9)
Debt issuance costs	(8.0)	(8.6)
Less: Current maturities	$ (625.0)
Debt instrument, interest rate (as a percent)	1.00%		1.00%
Debt discount	$ 57.0	61.9
Debt issuance costs	8.0	8.6
1.625% Notes \| Convertible Debt
Debt Instrument [Line Items]
Carrying Amount	575.0	575.0
Debt discount	(100.5)	(104.3)
Debt issuance costs	$ (9.6)	(10.0)
Debt instrument, interest rate (as a percent)	1.625%
Debt discount	$ 100.5	104.3
Debt issuance costs	$ 9.6	$ 10.0

Long-Term Debt - Annual Maturities Relating To Long-Term Debt (Details) $ in Millions	Mar. 30, 2018 USD ($)
Long-term Debt, Fiscal Year Maturity [Abstract]
Remainder of 2018	$ 806.4
2019	47.7
2020	9.8
2021	400.0
2022	0.0
Thereafter	1,779.6
Total	$ 3,043.5

Long-Term Debt - Narrative (Details)			3 Months Ended
Long-Term Debt - Narrative (Details)	Jun. 08, 2015 USD ($) d $ / shares	Jan. 31, 2013 USD ($)	Mar. 30, 2018 USD ($) d $ / shares	Dec. 31, 2017 USD ($)
Debt Instrument [Line Items]
Current portion of long-term debt			$ 747,200,000	$ 248,100,000
Long-term debt			$ 3,043,500,000	$ 3,175,000,000
Notes Payable to Banks
Debt Instrument [Line Items]
Debt instrument, interest rate (as a percent)			0.00%	3.09%
Long-term debt			$ 0	$ 122,700,000
Debt instrument, term		7 years
1.00% Notes
Debt Instrument [Line Items]
Debt instrument, interest rate (as a percent)			1.00%
1.00% Notes \| Convertible Debt
Debt Instrument [Line Items]
Debt instrument, face amount	$ 690,000,000.0
Debt instrument, interest rate (as a percent)	1.00%		1.00%
Conversion ratio (in shares)	0.0540643
Conversion price per share (in dollars per share) \| $ / shares	$ 18.50		$ 24.05
Current portion of long-term debt			$ 625,000,000
Long-term debt			$ 690,000,000	$ 690,000,000
Debt Conversion, Period One \| 1.00% Notes \| Convertible Debt
Debt Instrument [Line Items]
Convertible debt instrument, threshold trading days \| d	20		20
Convertible debt instrument threshold consecutive trading days \| d	30		30
Convertible debt instrument threshold percentage of stock price trigger	130.00%		130.00%
Debt Conversion, Period Two \| 1.00% Notes \| Convertible Debt
Debt Instrument [Line Items]
Convertible debt instrument threshold consecutive trading days \| d	5
Convertible debt instrument period after consecutive trading days	5 days
Convertible debt instrument, ratio of trading price per 1000 principal amount	0.98
SANYO Electric
Debt Instrument [Line Items]
Debt instrument, face amount		$ 377,500,000

Earnings Per Share and Equity - Income per Share Calculations (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 30, 2018	Mar. 31, 2017
Earnings Per Share [Abstract]
Net income attributable to ON Semiconductor Corporation	$ 139.6	$ 78.2
Basic weighted average common shares outstanding (in shares)	425.9	419.8
Dilutive effect of share-based awards (in shares)	5.7	6.0
Dilutive effect of convertible notes (in shares)	12.6	0.0
Diluted weighted average common shares outstanding (in shares)	444.2	425.8
Net income per common share attributable to ON Semiconductor Corporation:
Basic (in dollars per share)	$ 0.33	$ 0.19
Diluted (in dollars per share)	$ 0.31	$ 0.18

Earnings Per Share and Equity - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 30, 2018	Mar. 31, 2017	Dec. 31, 2017	Jun. 08, 2015
Dividends Payable [Line Items]
Anti-dilutive shares	500,000	900,000
Number of repurchased shares	0	0
Payments of tax withholding for restricted shares	$ 18.8	$ 13.0
Common stock withheld underlying restricted stock units (less than)	700,000	900,000
Treasury stock, shares, reissued or retired during period	0
Non-controlling interest in consolidated subsidiary	$ 23.1		$ 22.2
Non-controlling interest share of earnings	$ 0.9	$ 0.5
1.00% Notes
Dividends Payable [Line Items]
Debt instrument, interest rate (as a percent)	1.00%
Convertible Debt \| 1.00% Notes
Dividends Payable [Line Items]
Debt instrument, interest rate (as a percent)	1.00%			1.00%
Average price of common stock to exceed to include effect of additional potential shares (in dollars per share)	$ 25.96
Conversion price per share (in dollars per share)	24.05			$ 18.50
Convertible Debt \| 1.00% Notes \| Embedded Derivative Financial Instruments
Dividends Payable [Line Items]
Conversion price per share (in dollars per share)	$ 18.5
Convertible Debt \| 1.625% Notes
Dividends Payable [Line Items]
Debt instrument, interest rate (as a percent)	1.625%
Average price of common stock to exceed to include effect of additional potential shares (in dollars per share)	$ 30.70
Convertible Debt \| 1.625% Notes \| Embedded Derivative Financial Instruments
Dividends Payable [Line Items]
Conversion price per share (in dollars per share)	$ 20.72
Leshan
Dividends Payable [Line Items]
Percentage of ownership on domestic subsidiaries	80.00%

Share-Based Compensation - Summary Of Share-Based Compensation Expense (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 30, 2018	Mar. 31, 2017
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation expense before income taxes	$ 18.4	$ 15.1
Related income tax benefits	3.9	5.3
Share-based compensation expense, net of taxes	$ 14.5	$ 9.8
U.S. federal statutory rate (as a percent)	21.00%	35.00%
Cost of revenues
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation expense before income taxes	$ 1.6	$ 1.5
Research and development
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation expense before income taxes	3.2	2.9
Selling and marketing
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation expense before income taxes	3.2	2.8
General and administrative
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation expense before income taxes	$ 10.4	$ 7.9

Share-Based Compensation - Narrative (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 30, 2018	Mar. 31, 2017	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Cash received from exercise of stock options	$ 3.6	$ 7.5
Amended And Restated Stock Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate of common stock available for grant	34.9		39.0
Employee Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized share-based compensation expense on non-vested stock options	$ 0.1
Stock option, weighted average period for recognition	4 months
Total intrinsic value of stock options exercised	$ 9.4
Cash received from exercise of stock options	$ 3.6
Options pre-vesting forfeitures estimated	11.00%	11.00%
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized share-based compensation expense on non-vested stock options	$ 130.9
Stock option, weighted average period for recognition	1 year 11 months 23 days
Options pre-vesting forfeitures estimated	5.00%	5.00%
Maximum award vesting period (in years)	3 years
Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate of common stock available for grant	8.0		8.0
Less than $24.46
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise price range, upper range limit (in dollars per share)	$ 24.46

Share-Based Compensation - Summary Of Stock Option Plans (Details) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 30, 2018 USD ($) $ / shares shares
Number of Shares
Number of Shares, Outstanding Beginning (in shares) \| shares	1.1
Number of Shares, Granted (in shares) \| shares	0.0
Number of Shares, Exercised (in shares) \| shares	(0.6)
Number of Shares, Canceled (in shares) \| shares	0.0
Number of Shares, Outstanding Ending (in shares) \| shares	0.5
Number of Shares, Exercisable (in shares) \| shares	0.5
Weighted-Average Exercise Price Per Share
Weighted-Average Exercise Price, Outstanding Beginning (in dollars per share) \| $ / shares	$ 6.95
Weighted-Average Exercise Price. Granted (in dollars per share) \| $ / shares	0.00
Weighted-Average Exercise Price, Exercised (in dollars per share) \| $ / shares	6.79
Weighted-Average Exercise Price, Canceled (in dollars per share) \| $ / shares	0.00
Weighted-Average Exercise Price, Outstanding Ending (in dollars per share) \| $ / shares	7.11
Weighted-Average Exercise Price, Exercisable (in dollars per share) \| $ / shares	$ 7.11
Weighted Average Remaining Contractual Term (in years), Outstanding	1 year 2 months 5 days
Weighted-Average Remaining Contractual Term (in years), Exercisable	1 year 2 months 5 days
Aggregate Intrinsic Value (In-The-Money), Outstanding \| $	$ 9.2
Aggregate Intrinsic Value (In-The-Money), Exercisable \| $	$ 9.2

Share-Based Compensation - Summary Of Restricted Stock Units Transactions (Details) - Restricted Stock Units shares in Millions	3 Months Ended
	Mar. 30, 2018 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Nonvested shares underlying restricted stock units, beginning (in shares) \| shares	9.8
Restricted stock units granted (in shares) \| shares	2.7
Restricted stock units released (in shares) \| shares	(2.6)
Restricted stock units forfeited (in shares) \| shares	(0.1)
Nonvested shares underlying restricted stock units, ending (in shares) \| shares	9.8
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Weighted Average Grant Date Fair Value, Nonvested, beginning (in dollars per share) \| $ / shares	$ 12.63
Weighted Average Grant Date Fair Value, Granted (in dollars per share) \| $ / shares	24.43
Weighted-Average Grant Date Fair Value, Released (in dollars per share) \| $ / shares	12.18
Weighted Average Grant Date Fair Value, Forfeited (in dollars per share) \| $ / shares	13.49
Weighted Average Grant Date Fair Value, Nonvested, ending (in dollars per share) \| $ / shares	$ 15.94

Commitments and Contingencies - Operating Leases Future Minimum Payments Receivable (Details) $ in Millions	3 Months Ended
	Mar. 30, 2018 USD ($)
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
Remainder of 2018	$ 29.1
2019	33.8
2020	23.7
2021	19.1
2022	14.6
Thereafter	55.9
Total	176.2
Sublease Income	$ 17.5

Commitments and Contingencies - Narrative (Details) $ in Thousands					1 Months Ended										3 Months Ended	12 Months Ended
	Mar. 09, 2017 patent	Nov. 01, 2016 patent	Aug. 11, 2016 patent	Oct. 14, 2008 claim	Dec. 31, 2016 claim	Nov. 30, 2016 patent	Dec. 31, 2015 USD ($)	May 31, 2015 USD ($)	Nov. 30, 2014 USD ($)	Mar. 31, 2013 USD ($)	May 31, 2012 patent	Apr. 30, 2012 claim	Jan. 31, 2011 USD ($)	Dec. 31, 2008 USD ($)	Mar. 30, 2018 USD ($) review claim	Dec. 31, 2017 review claim	Dec. 31, 2015 patent	Dec. 31, 2014 USD ($) patent	Dec. 31, 2009 patent	Dec. 31, 2008 claim	Dec. 31, 2006 USD ($)
Loss Contingencies [Line Items]
Outstanding guarantees and letters of credit															$ 6,400
Guarantees related to capital lease obligations															113,900
Revolving Credit Facility \| Line of Credit
Loss Contingencies [Line Items]
Line of credit, current borrowing capacity															15,000
Letter of Credit \| Line of Credit
Loss Contingencies [Line Items]
Credit commitment outstanding															$ 400
Power Integrations, Inc.
Loss Contingencies [Line Items]
Number of outstanding proceedings \| claim															8	8
Power Integrations, Inc. \| Minimum
Loss Contingencies [Line Items]
Loss contingency, estimate of possible loss															$ 4,000
Power Integrations, Inc. \| Maximum
Loss Contingencies [Line Items]
Loss contingency, estimate of possible loss															$ 20,000
Power Integrations, Northern District of California, 2016
Loss Contingencies [Line Items]
Loss contingency, number of patents allegedly infringed upon \| patent			6
Number of patents requiring declaratory judgment \| patent						2
Power Integrations, Arizona, 2016
Loss Contingencies [Line Items]
Gain contingency, number of patents allegedly infringed upon \| patent		6
Number of patents requiring declaratory judgment \| patent			3
Power Integrations, Delaware, 2017
Loss Contingencies [Line Items]
Loss contingency, number of patents allegedly infringed upon \| patent	7
Gain contingency, number of patents allegedly infringed upon \| patent	6
Power Integrations, Inc., USPTO
Loss Contingencies [Line Items]
Patents reviewed and found unpatentable \| review																2
Inter party review \| review															3
Fairchild
Loss Contingencies [Line Items]
Maximum remediation cost recoveries receivable															$ 150,000
Fairchild \| Power Integrations, Inc.
Loss Contingencies [Line Items]
Number of outstanding proceedings \| claim															5
Fairchild \| Power Integrations, Delaware, 2004
Loss Contingencies [Line Items]
Litigation settlement, amount paid													$ 12,200	$ 6,100							$ 34,000
Loss contingency, number of patents allegedly infringed upon \| claim																				2
Fairchild \| Power Integrations, Delaware, 2004 \| Maximum
Loss Contingencies [Line Items]
Value of sales and imports of affected products										$ 750
Fairchild \| Power Integrations, Delaware, 2008
Loss Contingencies [Line Items]
Loss contingency, number of patents allegedly infringed upon \| claim												4
Gain contingency, number of patents found infringed upon \| claim												1
Gain contingency, number of patents allegedly infringed upon \| claim				2
Loss contingency, number of patents infringed upon \| claim												2
Loss contingency, number of patents found not infringed upon \| claim					1
Fairchild \| Power Integrations, Northern District of California, 2009
Loss Contingencies [Line Items]
Litigation settlement, amount paid							$ 139,800											$ 105,000
Loss contingency, number of patents allegedly infringed upon \| patent																			3
Gain contingency, number of patents allegedly infringed upon \| patent																			2
Loss contingency, number of patents infringed upon \| patent																		2
Litigation settlement, amount vacated									$ 105,000
Litigation settlement interest							$ 7,000
Fairchild \| Power Integrations, Delaware, 2012
Loss Contingencies [Line Items]
Loss contingency, number of patents allegedly infringed upon \| patent											5
Loss contingency, number of patents found not infringed upon \| patent											1
Litigation settlement, amount awarded from other party								$ 2,400
Fairchild \| Power Integrations, Delaware, 2012, 2
Loss Contingencies [Line Items]
Litigation settlement, amount paid								$ 100
Fairchild \| Power Integrations, Northern District of California, 2015
Loss Contingencies [Line Items]
Loss contingency, number of patents allegedly infringed upon \| patent																	2
Gain contingency, number of patents allegedly infringed upon \| patent																	4
Fairchild
Loss Contingencies [Line Items]
Business acquisition, maximum indemnification period															6 years

Fair Value Measurements - Summary of Fair Value of Assets and Liabilities Measured on Recurring Basis (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Millions	Mar. 30, 2018	Dec. 31, 2017
Fair Value, Inputs, Level 1
Liabilities
Contingent consideration		$ 0.0
Fair Value, Inputs, Level 1 \| Demand and time deposits
Assets
Cash and cash equivalents	$ 14.5	71.7
Fair Value, Inputs, Level 1 \| Money market funds
Assets
Cash and cash equivalents	0.4	0.2
Fair Value, Inputs, Level 2
Liabilities
Contingent consideration		0.0
Fair Value, Inputs, Level 2 \| Demand and time deposits
Assets
Cash and cash equivalents	0.0	0.0
Fair Value, Inputs, Level 2 \| Money market funds
Assets
Cash and cash equivalents	0.0	0.0
Fair Value, Inputs, Level 3
Liabilities
Contingent consideration		2.3
Fair Value, Inputs, Level 3 \| Demand and time deposits
Assets
Cash and cash equivalents	0.0	0.0
Fair Value, Inputs, Level 3 \| Money market funds
Assets
Cash and cash equivalents	0.0	0.0
Estimate of Fair Value
Liabilities
Contingent consideration		2.3
Estimate of Fair Value \| Demand and time deposits
Assets
Cash and cash equivalents	14.5	71.7
Estimate of Fair Value \| Money market funds
Assets
Cash and cash equivalents	$ 0.4	$ 0.2

Fair Value Measurements - Summary of Carrying Amounts and Fair Values of Long-Term Borrowings (Details) - USD ($) $ in Millions	Mar. 30, 2018	Dec. 31, 2017
Carrying Amount	$ 3,043.5	$ 3,175.0
Convertible notes
Carrying Amount	1,089.9	1,080.1
Fair Value	1,749.0	1,596.7
Long-term debt
Carrying Amount	1,705.6	1,833.2
Fair Value	$ 1,700.9	$ 1,845.4

Fair Value Measurements - Narrative (Details) - USD ($)	3 Months Ended
Fair Value Measurements - Narrative (Details) - USD ($)	Mar. 30, 2018	Dec. 31, 2017	Jun. 08, 2015
Debt Instrument [Line Items]
Cost method investments, fair value	$ 12,600,000	$ 12,600,000
1.00% Notes
Debt Instrument [Line Items]
Debt instrument, interest rate (as a percent)	1.00%
Convertible Debt \| 1.00% Notes
Debt Instrument [Line Items]
Debt instrument, interest rate (as a percent)	1.00%		1.00%
Convertible Debt \| 1.625% Notes
Debt Instrument [Line Items]
Debt instrument, interest rate (as a percent)	1.625%
AXSEM
Debt Instrument [Line Items]
Contingent consideration relating to the second earn-out	$ 0

Financial Instruments - Narrative (Details)		3 Months Ended
Financial Instruments - Narrative (Details)	Jan. 11, 2017 USD ($) financial_institution	Mar. 30, 2018 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2017 USD ($)
Derivatives, Fair Value [Line Items]
Foreign currency transaction loss realized		$ 4,400,000	$ 2,300,000
Number of financial institutions \| financial_institution	3
Hedge ineffectiveness		0	0
Effects of cash flow hedges		(3,800,000)	(800,000)
Cash Flow Hedging \| Reclassification out of Accumulated Other Comprehensive Income \| Cost of revenues \| Effects of Cash Flow Hedges
Derivatives, Fair Value [Line Items]
Effects of cash flow hedges		0	$ 0
Foreign currency exchange contracts
Derivatives, Fair Value [Line Items]
Notional amount		$ 115,600,000		$ 130,500,000
Foreign currency exchange contracts \| Minimum
Derivatives, Fair Value [Line Items]
Derivative, term of contract (in months)		1 month
Foreign currency exchange contracts \| Maximum
Derivatives, Fair Value [Line Items]
Derivative, term of contract (in months)		3 months
Interest Rate Swap Expiring December 29, 2017
Derivatives, Fair Value [Line Items]
Notional amount	$ 500,000,000.0
Interest Rate Swap Expiring December 31, 2018
Derivatives, Fair Value [Line Items]
Notional amount	750,000,000.0
Interest Rate Swap Expiring December 31, 2019
Derivatives, Fair Value [Line Items]
Notional amount	$ 1,000,000,000.0
Convertible Debt \| 1.00% Notes
Derivatives, Fair Value [Line Items]
Debt instrument, interest rate (as a percent)		1.00%
Convertible Debt \| 1.625% Notes
Derivatives, Fair Value [Line Items]
Debt instrument, interest rate (as a percent)		1.625%

Financial Instruments - Schedule of Net Foreign Exchange Positions (Details) - Foreign currency exchange contracts - USD ($) $ in Millions	Mar. 30, 2018	Dec. 31, 2017
Derivatives, Fair Value [Line Items]
Buy (Sell)	$ 13.0	$ (15.9)
Notional Amount	115.6	130.5
Other Currencies - Buy
Derivatives, Fair Value [Line Items]
Buy (Sell)	35.4	30.9
Notional Amount	35.4	30.9
Other Currencies - Sell
Derivatives, Fair Value [Line Items]
Buy (Sell)	(6.4)	(10.3)
Notional Amount	6.4	10.3
Euro
Derivatives, Fair Value [Line Items]
Buy (Sell)	(29.0)	(22.9)
Notional Amount	29.0	22.9
Japanese Yen
Derivatives, Fair Value [Line Items]
Buy (Sell)	(15.9)	(40.0)
Notional Amount	15.9	40.0
Philippine Peso
Derivatives, Fair Value [Line Items]
Buy (Sell)	28.9	26.4
Notional Amount	$ 28.9	$ 26.4

Income Taxes Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
Income Taxes Income Taxes (Details) - USD ($) $ in Millions	Mar. 30, 2018	Mar. 31, 2017	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Effective income tax rate (as a percent)	10.50%
U.S. federal statutory rate (as a percent)	21.00%	35.00%
Deferred tax assets, liquidation of foreign subsidiary	$ 17.1
Equity award excess tax benefits	6.7
Provisional tax benefit			$ 449.9
Unrecognized tax benefits, income tax penalties and interest accrued	6.4	$ 5.4
Possible reduction in unrecognized tax benefits in next twelve months	$ 13.4

Changes in Accumulated Other Comprehensive Loss - Components of Other Comprehensive Income (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 30, 2018	Mar. 31, 2017
Accumulated Other Comprehensive Income [Roll Forward]
Balance, beginning	$ 2,801.0
Other comprehensive income (loss) prior to reclassifications	6.1
Amounts reclassified from accumulated other comprehensive loss	0.1
Other comprehensive income, net of tax of $1.0 and $0.6, respectively	6.2	$ 7.1
Balance, ending	2,951.5
Cash flow hedges, tax	1.0
Foreign Currency Translation Adjustments
Accumulated Other Comprehensive Income [Roll Forward]
Balance, beginning	(43.2)
Other comprehensive income (loss) prior to reclassifications	2.4
Amounts reclassified from accumulated other comprehensive loss	0.0
Other comprehensive income, net of tax of $1.0 and $0.6, respectively	2.4
Balance, ending	(40.8)
Effects of Cash Flow Hedges
Accumulated Other Comprehensive Income [Roll Forward]
Balance, beginning	2.6
Other comprehensive income (loss) prior to reclassifications	3.7
Amounts reclassified from accumulated other comprehensive loss	0.1
Other comprehensive income, net of tax of $1.0 and $0.6, respectively	3.8
Balance, ending	6.4
Total
Accumulated Other Comprehensive Income [Roll Forward]
Balance, beginning	(40.6)
Balance, ending	$ (34.4)

Changes in Accumulated Other Comprehensive Loss - Reclassifications from Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 30, 2018	Mar. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassifications, tax	$ 0.0
Other income and expense	28.8	$ 68.1
Net income	(140.5)	(78.7)
Reclassification out of Accumulated Other Comprehensive Income
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other income and expense	(0.1)	0.2
Net income	$ (0.1)	$ 0.2

Supplemental Disclosures - Non-Cash Financing Activities And Cash Payments (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 30, 2018	Mar. 31, 2017
Non-cash activities:
Capital expenditures in accounts payable and other liabilities	$ 209.1	$ 125.3
Cash (received) paid for:
Interest income	(0.9)	(0.6)
Interest expense	16.6	27.6
Income taxes	$ 19.1	$ 18.4

Supplemental Disclosures - Reconciliation of Cash in the Balance Sheet and Statement of Cash Flows (Details) - USD ($) $ in Millions	Mar. 30, 2018	Dec. 31, 2017	Mar. 31, 2017	Dec. 31, 2016
Supplemental Cash Flow Elements [Abstract]
Cash and cash equivalents	$ 924.9	$ 949.2	$ 728.9	$ 1,028.1
Restricted cash (included in other current assets)	17.4	17.4	17.7	17.7
Cash, cash equivalents and restricted cash in Consolidated Statements of Cash Flows	$ 942.3	$ 966.6	$ 746.6	$ 1,045.8

Subsequent Events (Details) - USD ($) $ in Millions			6 Months Ended
Subsequent Events (Details) - USD ($) $ in Millions	Apr. 01, 2018	Oct. 10, 2017	Mar. 31, 2018
Subsequent Event [Line Items]
Incremental ownership share of AFSM		30.00%
Ownership interest in AFSM before transaction			10.00%
Subsequent Event
Subsequent Event [Line Items]
Purchase price of production facility	$ 20.0
Ownership interest in AFSM following transaction	40.00%
Required increase in ownership percentage, period of one to six months	60.00%
Required increase in ownership percentage, period of nine and eighteen months	100.00%