ON Semiconductor (ON) 10-K 21 Feb 14 2013 FY Annual report Financial data

Document_And_Entity_Informatio

Document And Entity Information (USD $)	12 Months Ended
	Dec. 31, 2013	Feb. 18, 2014	Jun. 28, 2013
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-K	'	'
Document Period End Date	31-Dec-13	'	'
Document Fiscal Period Focus	'FY	'	'
Document Fiscal Year Focus	'2013	'	'
Amendment Flag	'false	'	'
Entity Common Stock, Shares Outstanding	'	440,421,919	'
Entity Well-known Seasoned Issuer	'Yes	'	'
Entity Public Float	'	'	$3,590,800,724
Entity Current Reporting Status	'Yes	'	'
Entity Voluntary Filers	'No	'	'

Consolidated_Balance_Sheet

Consolidated Balance Sheet (USD $)	Dec. 31, 2013		Dec. 31, 2012
In Millions, unless otherwise specified
Assets	'		'
Cash and cash equivalents	$509.50		$486.90
Short-term investments	116.2		144.8
Receivables, net	383.4		357.8
Inventories	611.8		581.7
Other current assets	89.3		122.2
Total current assets	1,710.20		1,693.40
Property, plant and equipment, net	1,074.20	[1]	1,103.30
Goodwill	184.6		184.6
Intangible assets, net	223.4		257
Other assets	64.6		90.1
Total assets	3,257		3,328.40
Liabilities, Non-Controlling Interest and Stockholders’ Equity	'		'
Accounts payable	276.8		279.5
Accrued expenses	220.3		256.7
Deferred income on sales to distributors	140.5		134.5
Current portion of long-term debt (see Note 8)	181.6		353.6
Total current liabilities	819.2		1,024.30
Long-term debt (see Note 8)	760.6		658.3
Other long-term liabilities	190.4		255.1
Total liabilities	1,770.20		1,937.70
Commitments and contingencies (See Note 12)	'		'
ON Semiconductor Corporation stockholders’ equity:	'		'
Common stock ($0.01 par value, 750,000,000 shares authorized, 515,888,942 and 509,977,999 shares issued, 440,250,288 and 448,824,345 shares outstanding, respectively)	5.2		5.1
Additional paid-in capital	3,210.80		3,156.40
Accumulated other comprehensive loss	-47.4		-41.1
Accumulated deficit	-1,142.10		-1,292.90
Less: treasury stock, at cost; 75,638,654 and 61,153,654 shares, respectively	-572.5		-466.4
Total ON Semiconductor Corporation stockholders’ equity	1,454		1,361.10
Non-controlling interest in consolidated subsidiary	32.8		29.6
Total stockholders' equity	1,486.80		1,390.70
Total liabilities and equity	$3,257		$3,328.40
[1]	Included in property, plant and equipment are $8.7 million of fixed assets that are held-for-sale as of December 31, 2013.

Consolidated_Balance_Sheet_Par

Consolidated Balance Sheet (Parenthetical) (USD $)	Dec. 31, 2013	Dec. 31, 2012
Stockholders' Equity:	'	'
Common stock, par value	$0.01	$0.01
Common stock, shares authorized	750,000,000	750,000,000
Common stock, shares issued	515,888,942	509,977,999
Common stock, shares outstanding	440,250,288	448,824,345
Treasury stock, shares	75,638,654	61,153,654

Consolidated_Statements_Of_Ope

Consolidated Statements Of Operations And Comprehensive Income (USD $)	12 Months Ended
In Millions, except Per Share data, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Statement [Abstract]	'	'	'
Revenues	$2,782.70	$2,894.90	$3,442.30
Cost of revenues	1,844.30	1,943	2,433.50
Gross profit	938.4	951.9	1,008.80
Operating expenses:	'	'	'
Research and development	334.2	367.5	362.5
Selling and marketing	171.2	180.9	195.1
General and administrative	148.5	160.6	192.4
Amortization of acquisition-related intangible assets	33.1	44.4	42.7
Restructuring, asset impairments and other, net	33.2	165.3	102.7
Goodwill and intangible asset impairment	0	49.5	0
Total operating expenses	720.2	968.2	895.4
Operating income (loss)	218.2	-16.3	113.4
Other income (expenses), net:	'	'	'
Interest expense	-38.6	-56.1	-68.9
Interest income	1.3	1.5	1.1
Other	3.1	5.8	-8.9
Loss on debt exchange	-3.1	-7.8	-23.2
Gain on SANYO Semiconductor acquisition	0	0	24.3
Other income (expenses), net	-37.3	-56.6	-75.6
Income (loss) before income taxes	180.9	-72.9	37.8
Income tax provision	-26.9	-13.4	-22.9
Net income (loss)	154	-86.3	14.9
Less: Net income attributable to non-controlling interest	-3.2	-4.3	-3.3
Net income (loss) attributable to ON Semiconductor Corporation	150.8	-90.6	11.6
Comprehensive income (loss), net of tax:	'	'	'
Net income (loss)	154	-86.3	14.9
Foreign currency translation adjustments	-3.8	4.3	12.3
Effects of cash flow hedges	-2.6	0.8	0
Unrealized gain on available-for-sale securities	0	0.4	0
Amortization of prior service costs of defined benefit plan	0.1	0.1	0.1
Other comprehensive (loss) income	-6.3	5.6	12.4
Comprehensive income (loss)	147.7	-80.7	27.3
Comprehensive income attributable to non-controlling interest	-3.2	-4.3	-3.3
Comprehensive income (loss) attributable to ON Semiconductor Corporation	$144.50	($85)	$24
Net income (loss) per common share attributable to ON Semiconductor Corporation:	'	'	'
Basic (dollars per common share)	$0.34	($0.20)	$0.03
Diluted (dollars per common share)	$0.33	($0.20)	$0.03
Weighted average common shares outstanding:	'	'	'
Basic weighted average common shares outstanding	447.9	452.6	446.7
Diluted weighted average common shares outstanding	450.7	452.6	457.2

Consolidated_Statement_Of_Stoc

Consolidated Statement Of Stockholder's Equity (USD $)	Total		Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Accumulated Deficit [Member]	Treasury Stock [Member]	Non-controlling Interests In Consolidated Subsidiaries [Member]
In Millions, except Share data, unless otherwise specified
Balance, beginning at Dec. 31, 2010	$1,388		$4.90	$3,016.10	($59.10)	($1,213.90)	($382)	$22
Balance, beginning shares at Dec. 31, 2010	'		485,904,100	'	'	'	-49,129,923	'
Increase (Decrease) in Stockholders' Equity [Roll Forward]	'		'	'	'	'	'	'
Comprehensive income (loss)	27.3		'	'	12.4	11.6	'	3.3
Stock option exercises, shares	'		8,734,690	'	'	'	'	'
Stock option exercises	59.4		0.1	59.3	'	'	'	'
Shares issued pursuant to the employee stock purchase plan, shares	'		1,152,778	'	'	'	'	'
Shares issued pursuant to the employee stock purchase plan	8.1		'	8.1	'	'	'	'
Restricted stock units and stock grant awards issued, shares	'		6,660,516	'	'	'	'	'
Restricted stock units and stock grant awards issued	0		'	'	'	'	'	'
Net share settlement of restricted stock units, shares	'		'	'	'	'	-2,037,941	'
Net share settlement of restricted stock units	-19.3		'	'	'	'	-19.3	'
Share-based compensation expense	33.5		'	33.5	'	'	'	'
Repurchase or exchange of convertible notes	-25.8		'	-25.8	'	'	'	'
Repurchase or exchange of convertible notes, Series B	22.3		'	22.3	'	'	'	'
Balance, ending at Dec. 31, 2011	1,493.50		5	3,113.50	-46.7	-1,202.30	-401.3	25.3
Balance, ending shares at Dec. 31, 2011	'		502,452,084	'	'	'	-51,167,864	'
Increase (Decrease) in Stockholders' Equity [Roll Forward]	'		'	'	'	'	'	'
Comprehensive income (loss)	-80.7		'	'	5.6	-90.6	'	4.3
Stock option exercises, shares	'		1,866,376	'	'	'	'	'
Stock option exercises	9.4		0.1	9.3	'	'	'	'
Shares issued pursuant to the employee stock purchase plan, shares	'		1,445,309	'	'	'	'	'
Shares issued pursuant to the employee stock purchase plan	8.3		'	8.3	'	'	'	'
Restricted stock units and stock grant awards issued, shares	'		4,214,230	'	'	'	'	'
Restricted stock units and stock grant awards issued	0		'	'	'	'	'	'
Net share settlement of restricted stock units, shares	'		'	'	'	'	-1,141,640	'
Net share settlement of restricted stock units	-9.6		'	'	'	'	-9.6	'
Share-based compensation expense	20.5		'	20.5	'	'	'	'
Repurchase of common stock, shares	-8,800,000	[1]	'	'	'	'	-8,844,150	'
Repurchase of common stock	-55.5		'	'	'	'	-55.5	'
Exchange of convertible notes	4.8		'	4.8	'	'	'	'
Balance, ending at Dec. 31, 2012	1,390.70		5.1	3,156.40	-41.1	-1,292.90	-466.4	29.6
Balance, ending shares at Dec. 31, 2012	'		509,977,999	'	'	'	-61,153,654	'
Increase (Decrease) in Stockholders' Equity [Roll Forward]	'		'	'	'	'	'	'
Comprehensive income (loss)	147.7		'	'	-6.3	150.8	'	3.2
Stock option exercises, shares	2,100,000		2,084,541	'	'	'	'	'
Stock option exercises	12.1		0.1	12	'	'	'	'
Shares issued pursuant to the employee stock purchase plan, shares	'		1,330,919	'	'	'	'	'
Shares issued pursuant to the employee stock purchase plan	8.3		'	8.3	'	'	'	'
Restricted stock units and stock grant awards issued, shares	'		2,495,483	'	'	'	'	'
Restricted stock units and stock grant awards issued	0		'	'	'	'	'	'
Net share settlement of restricted stock units, shares	'		'	'	'	'	-581,585	'
Net share settlement of restricted stock units	-4.5		'	'	'	'	-4.5	'
Share-based compensation expense	32.3		'	32.3	'	'	'	'
Repurchase of common stock, shares	-13,900,000	[1]	'	'	'	'	-13,903,415	'
Repurchase of common stock	-101.6		'	'	'	'	-101.6	'
Exchange of convertible notes	1.8		'	1.8	'	'	'	'
Balance, ending at Dec. 31, 2013	$1,486.80		$5.20	$3,210.80	($47.40)	($1,142.10)	($572.50)	$32.80
Balance, ending shares at Dec. 31, 2013	'		515,888,942	'	'	'	-75,638,654	'
[1]	None of these shares had been reissued or retired as of December 31, 2013, but may be reissued or retired by the Company at a later date.

Consolidated_Statement_Of_Cash

Consolidated Statement Of Cash Flows (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Cash flows from operating activities:	'	'	'
Net income (loss)	$154	($86.30)	$14.90
Adjustments to reconcile net income to net cash provided by operating activities:	'	'	'
Depreciation and amortization	211.8	243.6	229.4
Gain on sale or disposal of fixed assets	-6.8	-9.5	-8.7
Non-cash manufacturing expenses associated with favorable supply agreement	0	0	80.4
Loss on debt exchange	3.1	7.8	23.2
Gain on SANYO Semiconductor acquisition	0	0	-24.3
Amortization of debt issuance costs	1.3	2.1	2.3
Provision for excess inventories	51.9	51.9	49.1
Non-cash share-based compensation expense	32.3	20.5	33.5
Non-cash interest	11.2	23.4	34.9
Non-cash asset impairment charges	8	103	86.3
Non-cash goodwill and intangible asset impairment charges	0	49.5	0
Recovery from insurance proceeds on property, plant and equipment	0	0	-13.3
Non-cash portion of insurance recovery	0	0	-23.9
Non-cash foreign currency translation gain	-21	0	0
Other	8.7	-4.7	-3.5
Changes in assets and liabilities (exclusive of the impact of acquisitions):	'	'	'
Receivables	-35.4	95.4	89.1
Inventories	-97.6	-7.1	102.1
Other assets	20.4	-9.9	-15.2
Accounts payable	6.6	-161.3	-109.7
Accrued expenses	21.7	5.9	-35.1
Deferred income on sales to distributors	6	-37.5	22.5
Other long-term liabilities	-48.9	-10.8	11.5
Net cash provided by operating activities	327.3	276	545.5
Cash flows from investing activities:	'	'	'
Purchases of property, plant and equipment	-155.2	-256.3	-316.4
Proceeds from sales of property, plant and equipment	9.7	6.2	3.3
Deposits (made) utilized for purchases of property, plant and equipment	-1.3	1.4	0.5
Recovery from insurance on property, plant and equipment	0	11.5	13.3
Purchase of businesses, net of cash acquired	0	0	-17.9
Proceeds from held-to-maturity securities	224.3	377.6	122.2
Purchase of held-to-maturity securities	-195.7	-273.8	-370.8
Change in restricted cash	0	0	142.1
Net cash used in investing activities	-118.2	-133.4	-423.7
Cash flows from financing activities:	'	'	'
Proceeds from issuance of common stock under the employee stock purchase plan	8.3	8.3	8.1
Proceeds from exercise of stock options	12.1	9.4	59.4
Payments of tax withholding for restricted shares	-4.5	-9.6	-19.3
Repurchase of common stock	-101	-55.5	0
Proceeds from debt issuance	173.7	23.6	69
Payment of capital lease obligations	-41.7	-40.8	-39
Repayment of long-term debt	-217.7	-232.5	-159.5
Payments made in connection with debt refinancing	-3.2	-2.6	-15.9
Net cash used in financing activities	-174	-299.7	-97.2
Effect of exchange rate changes on cash and cash equivalents	-12.5	-8.9	5
Net increase (decrease) in cash and cash equivalents	22.6	-166	29.6
Cash and cash equivalents, beginning of period	486.9	652.9	623.3
Cash and cash equivalents, end of period	$509.50	$486.90	$652.90

Background_And_Basis_Of_Presen

Background And Basis Of Presentation	12 Months Ended
	Dec. 31, 2013
Organization, Consolidation and Presentation of Financial Statements [Abstract]	'
Background And Basis Of Presentation	'
	Background and Basis of Presentation
	ON Semiconductor Corporation (“ON Semiconductor”), together with its wholly and majority-owned subsidiaries (the “Company”), prepares its financial statements in accordance with generally accepted accounting principles in the United States of America. As of December 31, 2013, the Company was organized into three operating segments, which also represent its three reporting segments: Application Products Group, Standard Products Group and System Solutions Group (formerly referred to as the "SANYO Semiconductor Products Group"). Additional details on our operating segments are included in Note 18: "Segment Information."
	The Company condensed certain prior year amounts in our consolidated financial statements to conform to the current year presentation.

Significant_Accounting_Policie

Significant Accounting Policies	12 Months Ended
	Dec. 31, 2013
Accounting Policies [Abstract]	'
Significant Accounting Policies	'
	Significant Accounting Policies
	Principles of Consolidation
	The accompanying consolidated financial statements include the accounts of the Company, including its wholly-owned and majority-owned subsidiaries. Investments in companies that represent less than 20% of the related voting stock where the Company does not have the ability to exert significant influence are accounted for on a cost basis. All material intercompany accounts and transactions have been eliminated.
	Use of Estimates
	The preparation of financial statements in accordance with generally accepted accounting principles in the United States of America requires management to make estimates and assumptions that affect the reported amount of assets and liabilities at the date of the financial statements and the reported amount of revenues and expenses during the reporting period. Significant estimates have been used by management in conjunction with the following: (i) measurement of valuation allowances relating to trade receivables, inventories and deferred tax assets; (ii) estimates of future payouts for customer incentives, warranties, and restructuring activities; (iii) assumptions surrounding future pension obligations; (iv) fair values of stock options and of financial instruments (including derivative financial instruments); (v) evaluations of uncertain tax positions; and (vi) future cash flows used to assess and test for impairment of long-lived assets and, if applicable, goodwill. Actual results could differ from these estimates.
	Cash and cash equivalents
	The Company considers all highly liquid investments with an original maturity to the Company of three months or less to be cash equivalents. Cash and cash equivalents are maintained with reputable major financial institutions. If, due to current economic conditions, one or more of the financial institutions with which the Company maintains deposits fails, the Company's cash and cash equivalents may be at risk. Deposits with these banks generally exceed the amount of insurance provided on such deposits; however, these deposits typically may be redeemed upon demand and, therefore, bear minimal risk.
	Short-Term Investments
	Short-term investments have an original maturity to the Company between three months and one year, and are classified as held-to-maturity. Held-to-maturity securities are carried at amortized cost as it is the intent of the Company to hold these securities until maturity.
	Allowance for Doubtful Accounts
	In the normal course of business, the Company provides unsecured credit terms to its customers. Accordingly, the Company maintains an allowance for doubtful accounts for possible losses on uncollectible accounts receivable. The Company routinely analyzes accounts receivable and considers history, customer creditworthiness, facts and circumstances specific to outstanding balances, current economic trends, and payment term changes when evaluating adequacy of the allowance for doubtful accounts. For uncollectible accounts receivable, the Company records a loss against the allowance for doubtful accounts only after exhaustive efforts have been made to collect.
	Inventories
	Inventories are stated at the lower of standard cost (which approximates actual cost on a first-in, first-out basis) or market. General market conditions, as well as the Company's design activities, can cause certain of its products to become obsolete. The Company records provisions for potential excess and obsolete inventories based upon a regular analysis of inventory on hand compared to historical and projected end-user demand. These provisions can influence results from operations. For example, when demand for a given part falls, all or a portion of the related inventory, that is considered to be in excess of anticipated demand, is reserved, impacting cost of revenues and gross profit. If demand recovers and the parts previously reserved are sold, a higher than normal margin will generally be recognized. However, the majority of product inventory that has been previously reserved is ultimately discarded. Although the Company does sell some products that have previously been written down, such sales have historically been relatively consistent on a quarterly basis and the related impact on the Company's gross profit has not been material.
	Property, Plant and Equipment
	Property, plant and equipment are recorded at cost and are depreciated over estimated useful lives of 30-50 years for buildings and 3-20 years for machinery and equipment using accelerated and straight-line methods. Expenditures for maintenance and repairs are charged to operations in the period in which the expense is incurred. When assets are retired or otherwise disposed of, the related costs and accumulated depreciation are removed from the accounts and any resulting gain or loss is reflected in operations in the period realized.
	The Company evaluates the recoverability of the carrying amount of its property, plant and equipment whenever events or changes in circumstances indicate that the carrying amount of an asset group may not be fully recoverable. A potential impairment charge is evaluated when the undiscounted expected cash flows derived from an asset group are less than its carrying amount. Impairment losses are measured as the amount by which the carrying value of an asset group exceeds its fair value and are recognized in operating results. Judgment is used when applying these impairment rules to determine the timing of the impairment test, the undiscounted cash flows used to assess impairments and the fair value of an impaired asset group. The dynamic economic environment in which the Company operates and the resulting assumptions used to estimate future cash flows impact the outcome of these impairment tests.
	Business Combination Purchase Price Allocation
	The allocation of the purchase price of business combinations is based on management estimates and assumptions, and other information compiled by management, which utilizes established valuation techniques appropriate for the high-technology industry. These techniques include the income approach, cost approach or market approach, depending upon which approach is the most appropriate based on the nature and reliability of available data. The income approach is predicated upon the value of the future cash flows that an asset is expected to generate over its economic life. The cost approach takes into account the cost to replace (or reproduce) the asset and the effects on the asset's value of physical, functional and/or economic obsolescence that has occurred with respect to the asset. The market approach is used to estimate value from an analysis of actual transactions or offerings for economically comparable assets available as of the valuation date. See Note 4: "Acquisitions" for additional information.
	Goodwill
	Goodwill represents the excess of the purchase price over the estimated fair value of the net assets acquired in the Company's acquisitions. See Note 5: "Goodwill and Intangible Assets" and Note 4: "Acquisitions" for additional information.
	The Company evaluates its goodwill for potential impairment annually during the fourth quarter and whenever events or changes in circumstances indicate the carrying value of goodwill may not be recoverable. Determining the fair value of the Company's reporting units is subjective in nature and involves the use of significant estimates and assumptions, including projected net cash flows, discount and long-term growth rates. The Company determines the fair value of its reporting units based on an income approach, whereby the fair value of the reporting unit is derived from the present value of estimated future cash flows. Estimates of the future cash flows associated with the businesses are critical to these assessments. The assumptions about future conditions include factors such as future revenues, gross profits, operating expenses, and industry trends. The Company considers historical rates and current market conditions when determining the discount and long-term growth rates to use in its analysis. The Company considers other valuation methods, such as the cost approach or market approach, if it is determined that these methods provide a more representative approximation of fair value. Changes in these estimates based on evolving economic conditions or business strategies could result in material impairment charges in future periods. The Company bases its fair value estimates on assumptions it believes to be reasonable. Actual future results may differ from those estimates.
	When evaluating goodwill for impairment, the Company may initially perform a qualitative assessment which includes a review and analysis of certain quantitative factors to estimate if its reporting units' fair values significantly exceed their carrying values. When the estimate of a reporting unit's fair value appears more likely than not to be less than its carrying value based on this qualitative assessment, the Company continues to the first step of a two step impairment test.
	The first step of the goodwill impairment test compares the fair value of the reporting unit to its carrying value. If the fair value of the reporting unit exceeds the carrying value of the net assets associated with that unit, goodwill is not considered impaired and the Company is not required to perform further testing. If the carrying value of the net assets associated with the reporting unit exceeds the fair value of the reporting unit, then the Company must perform the second step of the goodwill impairment test in order to determine the implied fair value of the reporting unit’s goodwill. If, during this second step, the Company determines that the carrying value of a reporting unit’s goodwill exceeds its implied fair value, the Company would record an impairment loss equal to the difference.
	The Company has determined that its product families, which are components of its operating segments, constitute reporting units for purposes of allocating and testing goodwill. The Company's product families are one level below its operating segments, with the Company's segment management conducting regular reviews of the operating results for each product family. As of each acquisition date, all goodwill acquired was assigned to the product families that were expected to benefit from the synergies of the respective acquisition. The amount of goodwill assigned to each reporting unit was the difference between the fair value of the acquired business included in a reporting unit and the fair value of identifiable assets and liabilities allocated to the reporting unit as of the acquisition date.
	Intangible Assets
	The Company's acquisitions have resulted in intangible assets consisting of values assigned to IP, assembled workforce, customer relationships, non-compete agreements, patents, developed technology, trademarks, acquired software and IPRD. These are stated at cost less accumulated amortization, are amortized over their estimated useful lives ranging from less than 1 year to 18 years, and are reviewed for impairment when facts or circumstances suggest that the carrying value of the asset group containing these assets may not be recoverable. A potential impairment charge is evaluated when the undiscounted expected cash flows derived from an asset group are less than its carrying amount. Impairment losses are measured as the amount by which the carrying value of an asset group exceeds its fair value and are recognized in operating results. Judgment is used when applying these impairment rules to determine the timing of the impairment test, the undiscounted cash flows used to assess impairments and the fair value of an impaired asset group. The dynamic economic environment in which the Company operates and the resulting assumptions used to estimate future cash flows impact the outcome of these impairment tests. See Note 5: "Goodwill and Intangible Assets" for additional information.
	Treasury Stock
	Treasury stock is recorded at cost, inclusive of fees, commissions and other expenses, when outstanding common shares are repurchased or otherwise acquired by the Company, including when outstanding shares are withheld to satisfy tax withholding obligations in connection with certain shares pursuant to restricted stock units under the Company's share-based compensation plans. See Note 9: "Earnings Per Share and Equity" for additional information.
	Debt Issuance Costs
	Debt issuance costs are capitalized and amortized over the term of the underlying agreements using the effective interest method and, for the Company's convertible notes, are amortized through the first put date, which the Company considers to be the earliest maturity date. Upon prepayment of debt, the related unamortized debt issuance costs are charged to expense. Amortization of debt issuance costs is included in interest expense while the unamortized balance is included in other assets. See Note 8: "Long-Term Debt - Loss on Debt Repurchase or Exchange" for additional information.
	Revenue Recognition
	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 manufacturing services provided to customers.
	The Company recognizes revenue on sales to OEMs, distributors that are not entitled to returns and allowances, electronic manufacturing service providers and on sales of manufacturing services, net of provisions for related sales returns and allowances. Revenue is recognized when persuasive evidence of an arrangement exists, title and risk of loss pass to the customer (which is generally upon shipment), the price is fixed or determinable and collectability is reasonably assured.
	For products sold to distributors who are entitled to returns and allowances, the Company recognizes the related revenue and cost of revenues when it is informed by the distributor that it has resold the products to the end-user. As a result of the Company's inability to reliably estimate up front the effects of the returns and allowances with these distributors, the Company defers the related revenue and gross margin on sales to these distributors until it is informed by the distributor that the products have been resold to the end-user. Although payment terms vary, most distributor agreements require payment within 30 days.
	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 statement of operations.
	Sales returns and allowances are estimated based on historical experience. 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. Under the Company's general agreements, distributors are allowed to return any product that has been removed from the price book. In addition, agreements with distributors typically contain standard stock rotation provisions permitting limited levels of product returns. However, since the Company defers recognition of revenue and gross profit on sales to distributors until the distributor resells the product, due to the inability to reliably estimate up front the effect of the returns and allowances with these distributors, sales returns and allowances have minimal impact on the results of operations. Provisions for discounts and rebates to customers, estimated returns and allowances, and other adjustments are provided for in the same period the related revenues are recognized, and are netted against revenues. The Company reviews warranty and related claims activities and records adjustments, as necessary.
	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 approved specifications. The Company's standard warranty extends for a period that is the greater of (i) two years from the date of shipment or (ii) the period of time specified in the customer's standard warranty (provided that the customer's standard warranty is stated in writing and extended to purchasers at no additional charge). At the time revenue is recognized, the Company establishes an accrual for estimated warranty expenses associated with its sales, recorded as a component of cost of revenues. In addition, the Company also offers cash discounts to certain customers for payments received within an agreed upon time, generally 10 days after shipment. The Company records a reserve for cash discounts as a reduction to accounts receivable and a reduction to revenues, based on experience with each customer.
	Freight and handling costs are included in cost of revenues and are recognized as period expense during the period in which they are incurred.
	Research and Development Costs
	Research and development costs are expensed as incurred.
	Share-Based Compensation
	Share-based compensation cost is measured at the grant date, based on the estimated fair value of the award, and is recognized as expense over the employee's requisite service period. The Company has outstanding awards with performance, time and service-based vesting provisions. See Note 10: "Share-Based Compensation" for additional information.
	Income Taxes
	Income taxes are accounted for using the asset and liability method. Under this method, deferred income tax assets and liabilities are recognized for the future tax consequences attributable to temporary differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases. Deferred income tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which these temporary differences are expected to be recovered or settled. The effect on deferred tax assets and liabilities of a change in tax rates is recognized in income in the period that includes the enactment date. A valuation allowance is provided for those deferred tax assets for which management cannot conclude that it is more likely than not that such deferred tax assets will be realized.
	In determining the amount of the valuation allowance, estimated future taxable income, as well as feasible tax planning strategies for each taxing jurisdiction are considered. If the Company determines it is more likely than not that all or a portion of the remaining deferred tax assets will not be realized, the valuation allowance will be increased with a charge to income tax expense. Conversely, if the Company determines it is more likely than not to be able to utilize all or a portion of the deferred tax assets for which a valuation allowance has been provided, the related portion of the valuation allowance will be released to income as a reduction to income tax expense.
	The Company recognizes and measures benefits for uncertain tax positions using a two-step approach. The first step is to evaluate the tax position taken or expected to be taken in a tax return by determining if the weight of available evidence indicates that is it more likely than not that the tax positions will be sustained upon audit, including resolution of any related appeals or litigation processes. For tax positions that are more likely than not to be sustained upon audit, the second step is to measure the tax benefit as the largest amount that is more than 50% likely to be realized upon settlement. The Company's practice is to recognize interest and/or penalties related to income tax matters in income tax expense. Significant judgment is required to evaluate uncertain tax positions. Evaluations are based upon a number of factors, including changes in facts or circumstances, changes in tax law, correspondence with tax authorities during the course of audits and effective settlement of audit issues. Changes in the recognition or measurement of uncertain tax positions could result in material increases or decreases in income tax expense in the period in which the change is made, which could have a material impact on the Company's effective tax position. See Note 15: "Income Taxes" for additional information.
	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.
	The Company's Japanese subsidiaries utilize 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.
	Defined Benefit Pension Plans
	The Company maintains defined benefit pension plans, covering certain of its foreign employees. For financial reporting purposes, net periodic pension costs and pension obligations are determined based upon a number of actuarial assumptions, including discount rates for plan obligations, assumed rates of return on pension plan assets and assumed rates of compensation increases for employees participating in plans. These assumptions are based upon management's judgment and consultation with actuaries, considering all known trends and uncertainties. See Note 11: "Employee Benefit Plans" for additional information.
	Contingencies
	The Company is involved in a variety of legal matters that arise in the normal course of business. Based on information available, management evaluates the relevant range and likelihood of potential outcomes and records the appropriate liability when the amount is deemed probable and reasonably estimable.
	Fair Value Measurement
	The Company measures certain of its financial and non-financial assets at fair value by using a fair value hierarchy that prioritizes certain inputs into individual fair value measurement approaches. Fair value is the exchange price that would be received for an asset or paid to transfer a liability in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. Valuation techniques used to measure fair value must maximize the use of observable inputs and minimize the use of unobservable inputs. The fair value hierarchy is based on three levels of inputs, of which the first two are considered observable and the last unobservable, that may be used to measure fair value, as follows:
	•	Level 1 - Quoted prices in active markets for identical assets or liabilities;
	•	Level 2 - Inputs other than Level 1 that are observable, either directly or indirectly, such as quoted prices for similar assets or liabilities; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities;
	•	Level 3 - Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities.
	Companies may choose to measure certain financial instruments and certain other items at fair value. Unrealized gains and losses on items for which the fair value option has been elected must be reported in earnings. The Company has elected not to carry any of its debt instruments at fair value. See Note 13: "Fair Value Measurements" for additional information.

Recent_Accounting_Pronouncemen

Recent Accounting Pronouncements	12 Months Ended
	Dec. 31, 2013
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]	'
Recent Accounting Pronouncements	'
	Recent Accounting Pronouncements
	ASU No. 2013-11 - “Income Taxes (Topic 740): Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit Carryforward Exists” (“ASU 2013-11”)
	In July 2013, the FASB issued ASU 2013-11, which applies to the financial statement presentation of an unrecognized tax benefit when a net operating loss carryforward, a similar tax loss, or a tax credit carryforward exists. Pursuant to ASU 2013-11, an unrecognized tax benefit, or a portion of an unrecognized tax benefit, should be presented in the financial statements as a reduction to a deferred tax asset for a net operating loss carryforward, a similar tax loss, or a tax credit carryforward, with certain exceptions. The amendments contained in ASU 2013-11 do not require new recurring disclosures. The related amendments are effective for reporting periods beginning after December 15, 2013; however early adoption is permitted. ASU 2013-11 is not expected to have a material impact on the Company's consolidated financial statements.

Acquisitions

Acquisitions	12 Months Ended
	Dec. 31, 2013
Business Combinations [Abstract]	'
Acquisitions	'
	Acquisitions
	Acquisition of SANYO Semiconductor (the "SANYO Semiconductor Transaction")
	On January 1, 2011, the Company paid SANYO Electric $142.1 million in cash and issued a $377.5 million note payable to SANYO Electric, through SCI LLC, and as a result SANYO Semiconductor became a wholly-owned subsidiary of the Company as part of its System Solutions Group (formerly referred to as the "SANYO Semiconductor Products Group"). During 2011, the Company received $39.7 million in cash from SANYO Electric, of which $19.0 million was considered in the initial purchase accounting estimates, relating to funding adjustments for working capital and pension levels, as defined in the purchase agreement. As a result of these adjustments, the purchase price was reduced to $479.9 million as of December 31, 2011.
	SANYO Semiconductor designs, manufactures and sells discrete components, hybrid ICs, radio frequency and power related products as well as custom ICs. Many of these devices are similar to the Company’s existing product offerings; however, SANYO Semiconductor expanded the Company’s capacity in microcontrollers and custom ASICs for the consumer, automotive and industrial end-markets. SANYO Semiconductor also expands the Company’s presence in the Japan market.
	The following table presents the fair values of the net assets of SANYO Semiconductor as acquired (in millions):
		Fair Value
	Cash and cash equivalents	$	117.1
	Receivables, net	242.1
	Inventories	400.3
	Other current assets	119.7
	Property, plant and equipment	146.7
	Intangible assets	55.7
	Other non-current assets	75.4
	Total assets acquired	1,157.00
	Accounts payable	(300.0		)
	Other current liabilities	(152.0		)
	Long-term accrued liabilities	(200.8		)
	Total liabilities assumed	(652.8		)
	Net assets acquired	504.2
	Gain on acquisition	(24.3		)
	Purchase price	$	479.9
	The acquisition was accounted for as a business purchase pursuant to ASC Topic 805, Business Combinations, whereby acquisition costs are not included as components of consideration transferred, but are accounted for as expenses in the period in which the costs are incurred. In 2011, the Company recorded $7.3 million in acquisition related expenses associated with the SANYO Semiconductor Transaction.
	Accounting standards require that when the fair value of the net assets acquired exceeds the purchase price, resulting in a bargain purchase gain, the acquirer must reassess the reasonableness of the values assigned to all of the net assets acquired, liabilities assumed and consideration transferred. In 2011, the Company performed such a reassessment and concluded that the values assigned for the SANYO Semiconductor Transaction were reasonable. In 2011, the Company recorded a $24.3 million bargain purchase gain on the SANYO Semiconductor Transaction. The Company believes the gain realized in purchase accounting was the result of a number of factors, including the following: SANYO Electric's intent to exit its semiconductor operations, historical losses recognized by SANYO Electric, SANYO Electric viewed this as the best outcome for SANYO Semiconductor and the fact that the Company would incur expenses associated with the transfer and consolidation of certain operations.
	The $55.7 million of acquired intangible assets were assigned a weighted-average useful life of approximately 8.8 years. The intangible assets were comprised of: patents of $27.0 million (5.5-year weighted-average useful life), $3.0 million of trademarks (3.0-year weighted-average useful life) and customer relationships of $25.7 million (13.0-year weighted-average useful life). Other current assets include $80.0 million representing the estimated fair value of a favorable supply arrangement provided by SANYO Electric to the Company in the form of operational cost reduction to the acquired business during the period of time it was effectively required to utilize certain SANYO Electric seconded employees and manufacturing facilities in Japan. This asset has been charged to cost of goods sold over the period of benefit, which was the first five months of 2011. The amortization recorded totaled $80.4 million as a result of foreign currency exchange rate changes over the recognition period.
	Included in the final allocation of net assets acquired are long-term liabilities assumed representing approximately $50.9 million of underfunded pension obligations relating to existing defined benefit pension plans as well as $144.9 million representing estimated liabilities associated with the Company’s estimated portion of underfunded pension obligations relating to certain employees participating in the SANYO Electric or affiliate multiemployer defined benefit pension plans from which the Company withdrew and established defined benefit pension plans which provide similar retirement benefits as the SANYO Electric sponsored multiemployer plans. See Note 11: "Employee Benefit Plans" for additional information.
	The allocation of the purchase price was based on management estimates and assumptions, and other information compiled by management, which utilized established valuation techniques appropriate for the high-technology industry. The income approach, cost approach or market approach was used based on the nature of the asset or liability and reliability of the data available.
	Acquisition of the CMOS ISBU from Cypress Semiconductor
	On February 27, 2011, the Company acquired 100% of the CMOS ISBU from Cypress Semiconductor Corporation for approximately $34.1 million in cash. The ISBU business includes a broad portfolio of high-performance custom and standard image sensors used in multi-megapixel machine vision, linear and two dimensional (2D) bar code imaging, medical x-ray imaging, biometrics, digital photography and cinematography, and aerospace applications. The acquired products include the VITA, LUPA, STAR and IBIS families, which are all well known throughout the industry.
	The following table presents the allocation of the purchase price of the ISBU to the assets acquired and liabilities assumed on February 27, 2011 based on their fair values (in millions):
		Allocation
	Cash and cash equivalents	$	1.5
	Receivables, net	2.6
	Inventories	9.2
	Other current assets	0.4
	Property, plant and equipment	1.2
	Goodwill	7.5
	Intangible assets	11.2
	In-process research and development	11.2
	Total assets acquired	44.8
	Accounts payable	(5.6		)
	Other current liabilities	(3.7		)
	Other non-current liabilities	(1.4		)
	Total liabilities assumed	(10.7		)
	Net assets acquired	$	34.1
	Acquired intangible assets include $11.2 million which was assigned to IPRD assets and is being amortized over the useful life upon successful completion of the projects or expensed if impaired. The value assigned to IPRD was determined by considering the importance of products under development to the overall development plan, estimating costs to develop the purchased IPRD into commercially viable products, estimating the resulting net cash flows from the projects when completed and discounting the net cash flows to their present value. The fair value of IPRD was determined using the income approach. The income approach recognizes that the current value of an asset or liability is premised on the expected receipt or payment of future economic benefits generated over its remaining life. A discount rate of 17.5% was used in the present value calculations, and was derived from a weighted-average cost of capital analysis, adjusted to reflect the risks inherent in the acquired research and development operations.
	Other acquired intangible assets of $11.2 million include: customer relationships of $4.2 million (6.0-year weighted-average useful life), developed technology of $6.2 million (7.0-year weighted-average useful life) and backlog of $0.8 million (0.3-year weighted-average useful life).
	Goodwill of $7.5 million was assigned to the Application Products Group. Among the factors that contributed to goodwill arising from the acquisition were the potential synergies expected to be derived from combining the ISBU business with the Company’s existing sensor business. These relationships provided and continue to provide the capability of selling advanced technology of next generation products to the market place. Goodwill will not be amortized but instead tested for impairment at least annually (more frequently if certain indicators are present). The $7.5 million of goodwill as of December 31, 2013 is not expected to be deductible for tax purposes.
	The allocation of purchase price was based on management estimates and assumptions, and other information compiled by management, which utilized established valuation techniques appropriate for the high-technology industry. The valuation technique used was the income approach, cost approach or market approach, as determined to be the most appropriate based on the nature of the asset or liability and reliability of the data available.

Goodwill_And_Intangible_Assets

Goodwill And Intangible Assets	12 Months Ended
	Dec. 31, 2013
Goodwill and Intangible Assets Disclosure [Abstract]	'
Goodwill And Intangible Assets	'
	Goodwill and Intangible Assets
	Goodwill
	Goodwill is tested for impairment at the reporting unit level which is one level below the Company's operating segments. During the first step of the Company’s annual impairment analysis in the fourth quarters of 2013 and 2011, the Company determined that the carrying amount of the Company’s goodwill for all of its reporting units was recoverable.
	During the Company's annual impairment analysis in the fourth quarter of 2012, the Company performed a qualitative assessment, including a review and analysis of certain quantitative factors, market conditions and known trends that are specific to the respective reporting units to estimate if its reporting units' fair values significantly exceeded their carrying values. For reporting units where the fair value appeared more likely than not to be less than its carrying value based on this qualitative assessment, the Company continued to the first step of the two step impairment test. As a result of the 2012 impairment analysis, the Company recognized a goodwill impairment charge of $14.1 million relating to one of its reporting units in the Company's Standard Products Group operating segment.
	The Company uses the income approach, based on estimated future cash flows, to perform the goodwill impairment test. These estimates include assumptions about future conditions such as future revenues, gross profits, operating expenses, and industry trends. The Company considers other valuation methods, such as the cost approach or market approach, if it is determined that these methods provide a more representative approximation of fair value. The material assumptions used for the income approach for 2013 and 2011, when no impairment charges were necessary, included projected net cash flows, a weighted-average discount rate of approximately 14% and 14%, respectively, and a weighted-average long-term growth rate of 4.0% and 3.9%, respectively. The Company considered historical rates and current market conditions when determining the discount and growth rates to use in the Company's analysis.
	The following table summarizes goodwill by relevant reportable segment as of December 31, 2013 and December 31, 2012 (in millions):
			Balance as of December 31, 2013															Balance as of December 31, 2012
			Goodwill				Accumulated Amortization				Accumulated Impairment Losses				Carrying Value			Goodwill			Accumulated Amortization			Accumulated Impairment Losses			Carrying Value
	Operating Segment:
	Application Products Group		$	547.4			$	(4.2	)		$	(406.0	)		$	137.2		$	547.4		$	(4.2	)	$	(406.0	)	$	137.2
	Standard Products Group		76				(5.6		)		(23.0		)		47.4			76			(5.6		)	(23.0		)	47.4
			$	623.4			$	(9.8	)		$	(429.0	)		$	184.6		$	623.4		$	(9.8	)	$	(429.0	)	$	184.6
	The following table summarizes the change in goodwill from December 31, 2011 to December 31, 2013 (in millions):
	Net balance as of December 31, 2011		$	198.7
	Impairment charge		(14.1		)
	Net balance as of December 31, 2012		184.6
	Impairment charge		—
	Net balance as of December 31, 2013		$	184.6
	Intangible Assets
	As a result of the Company's annual goodwill impairment testing for 2012, it was determined that certain intangible assets associated with the Standard Products Group were also impaired. In connection with this impairment, the Company wrote-off approximately $3.8 million of intangible assets associated with the relevant Standard Products Group operating segment.
	Additionally, during the fourth quarter of 2012, the Company assessed the current period and expected future operating results of the System Solutions Group and recorded an impairment charge of approximately $126.0 million related to long-lived assets, including approximately $31.6 million of intangible assets. See Note 13: "Fair Value Measurements" for additional information.
	Intangible assets, net were as follows as of December 31, 2013 and December 31, 2012 (in millions):
		December 31, 2013
		Original				Accumulated				Foreign Currency				Accumulated Impairment			Carrying			Useful Life
		Cost				Amortization				Translation Adjustment							Value			(in Years)
	Intellectual property	$	13.9			$	(9.4	)		$	—			$	(0.4	)	$	4.1		12-May
	Customer relationships	280.3				(105.5		)		(27.4		)		(23.0		)	124.4			18-May
	Patents	43.7				(19.0		)		—				(13.7		)	11			12
	Developed technology	146.2				(66.7		)		—				(2.4		)	77.1			12-May
	Trademarks	14				(6.1		)		—				(1.1		)	6.8			15
	Total intangibles	$	498.1			$	(206.7	)		$	(27.4	)		$	(40.6	)	$	223.4
		December 31, 2012
		Original				Accumulated				Foreign Currency				Accumulated Impairment			Carrying			Useful Life
		Cost				Amortization				Translation Adjustment							Value			(in Years)
	Intellectual property	$	13.9			$	(8.7	)		$	—			$	(0.4	)	$	4.8		12-May
	Customer relationships	280.3				(91.8		)		(26.9		)		(23.0		)	138.6			18-May
	Patents	43.7				(16.6		)		—				(13.7		)	13.4			12
	Developed technology	146.2				(51.3		)		—				(2.4		)	92.5			12-May
	Trademarks	14				(5.2		)		—				(1.1		)	7.7			15
	Total intangibles	$	498.1			$	(173.6	)		$	(26.9	)		$	(40.6	)	$	257
	Amortization expense for intangible assets amounted to $33.1 million for the year ended December 31, 2013, of which none was included in cost of revenues; $44.4 million for the year ended December 31, 2012, of which none was included in cost of revenues; and $43.8 million for the year ended December 31, 2011, of which $1.1 million was included in cost of revenues. Amortization expense for intangible assets is expected to be as follows over the next five years, and thereafter (in millions):
		Total
	2014	$	32.6
	2015	31.7
	2016	30.6
	2017	27.7
	2018	24.4
	Thereafter	76.4
	Total estimated amortization expense	$	223.4

Restructuring_Asset_Impairment

Restructuring, Asset Impairments And Other, Net	12 Months Ended
	Dec. 31, 2013
Restructuring Charges [Abstract]	'
Restructuring, Asset Impairments And Other, Net	'
	Restructuring, Asset Impairments and Other, Net
	A summary description of the activity included in the “Restructuring, Asset Impairments and Other, net” caption on the Company's Consolidated Statements of Operations and Comprehensive Income for the years ended December 31, 2013, 2012 and 2011 is as follows (in millions):
		Restructuring		Asset Impairments		Other			Total
	Year Ended December 31, 2013
	System Solutions Group Voluntary Retirement Programs	52.9		—		(15.6		)	37.3
	Aizu facility closure	3.1		—		(22.4		)	(19.3		)
	KSS facility closure	6.5		3.5		—			10
	Other (1)	4.8		4.5		(4.1		)	5.2
	Total	$	67.3	$	8	$	(42.1	)	$	33.2
	Year Ended December 31, 2012
	2012 global workforce reduction	$	11.2	$	—	$	—		$	11.2
	System Solutions Group asset impairment	—		94.4		—			94.4
	System Solutions Group Voluntary Retirement Program	47.6		—		(11.7		)	35.9
	Aizu facility closure	9		4.5		0.1			13.6
	System Solutions Group consolidation	3.6		—		—			3.6
	Other (1)	2		4.1		0.5			6.6
	Total	$	73.4	$	103	$	(11.1	)	$	165.3
	Year Ended December 31, 2011
	Thailand facility closure	$	5.7	$	24.8	$	(18.6	)	$	11.9
	Aizu facility closure	6.5		61.5		2			70
	System Solutions Group consolidation	10		—		—			10
	Japan earthquake and tsunami	—		—		4.8			4.8
	Phoenix wafer manufacturing facility closure	4.3		—		—			4.3
	Other (1)	1.2		—		0.5			1.7
	Total	$	27.7	$	86.3	$	(11.3	)	$	102.7
	(1)    Includes charges related to the certain reductions in workforce, certain acquisitions, other facility closures, asset disposal activity and certain other activity which is not considered to be significant.
	Restructuring
	The following is a rollforward of the accrued restructuring charges from December 31, 2012 to December 31, 2013 (in millions):
		Balance as of December 31, 2012		Charges		Usage			Adjustments			Balance as of December 31, 2013
	Estimated employee separation charges	$	15.5	$	62.2	$	(50.9	)	$	(1.6	)	$	25.2
	Estimated costs to exit	1.6		5.1		(5.7		)	—			1
	Total	$	17.1	67.3		(56.6		)	(1.6		)	26.2
	The following is a rollforward of the accrued restructuring charges from December 31, 2011 to December 31, 2012 (in millions):
		Balance as of December 31, 2011		Charges		Usage			Adjustments			Balance as of December 31, 2012
	Estimated employee separation charges	$	8.9	$	67.8	$	(60.7	)	$	(0.5	)	$	15.5
	Estimated costs to exit	8.4		5.6		(12.2		)	(0.2		)	1.6
	Total	$	17.3	$	73.4	$	(72.9	)	$	(0.7	)	$	17.1
	The activity related to the Company’s significant restructuring programs that were either initiated in 2013 or had not been completed as of December 31, 2013, are as follows:
	System Solutions Group Voluntary Retirement Programs
	During the first quarter of 2013, the Company initiated a voluntary retirement program for employees of certain of its System Solutions Group subsidiaries in Japan (the "Q1 2013 Voluntary Retirement Program"). Approximately 500 employees opted to retire under the Q1 2013 Voluntary Retirement Program, and substantially all employees had retired by December 31, 2013. For the year ended December 31, 2013, the Company recognized approximately $35.4 million of employee separation charges related to the Q1 2013 Voluntary Retirement Program.
	During the fourth quarter of 2013, the Company initiated an additional voluntary retirement program for employees of certain of its System Solutions Group subsidiaries in Japan (the "Q4 2013 Voluntary Retirement Program"). Approximately 350 employees opted to retire under the Q4 2013 Voluntary Retirement Program, and 170 employees had retired by December 31, 2013. The remaining employees who accepted retirement packages are expected to retire by the end of 2014. For the year ended December 31, 2013, the Company recognized approximately $17.5 million of employee separation charges related to the Q4 2013 Voluntary Retirement Program. The Company expects to incur an additional $6.7 million in employee separation charges related to this program through the end of 2014, offset by a pension curtailment gain of approximately $4.5 million.
	As part of these restructuring activities, approximately 70 contractor positions were also identified for elimination, of which approximately half were terminated by the end of 2013, with the remaining contractors to be terminated by the end of 2014.
	As a result of the System Solutions Group headcount reductions, the Company recognized a $15.6 million benefit to the pension and related retirement liabilities associated with the affected employees during the year ended December 31, 2013, which is recorded in Restructuring, Asset Impairments and Other, Net. See Note 11: "Employee Benefit Plans" for additional information associated with the System Solutions Group's voluntary retirement programs.
	As of December 31, 2013, the accrued liability associated with employee separation charges was $17.8 million for the System Solutions Group Voluntary Retirement Programs.
	Aizu Facility Closure
	During 2011, the Company committed to a plan to close its wafer manufacturing facility located in Aizu, Japan (the "Aizu Plan") for cost savings purposes. The Company fully exited the facility pursuant to the Aizu Plan during 2013. Cumulative charges of $86.7 million, net of adjustments, have been recognized through December 31, 2013, related to the Aizu Plan. As of December 31, 2013, all affected employees have been separated from the Company.
	In connection with the closure and sale of its Aizu facility, the Company released the cumulative foreign currency translation adjustment of $21.0 million related to the Aizu facility, which was recorded as a benefit to Restructuring, Asset Impairments and Other, net for the year ended December 31, 2013. See Note 16: "Changes in Accumulated Other Comprehensive Loss" for additional information.
	All previously accrued liabilities associated with employee separation charges at the Aizu facility have been paid as of December 31, 2013.
	KSS Facility Closure
	On October 6, 2013, the Company announced a plan to close KSS by the end of the second quarter of 2014 (the "KSS Plan"). Pursuant to the KSS Plan, a majority of the production from KSS will be transferred to other of the Company's manufacturing facilities. The KSS Plan includes the elimination of approximately 170 full time and 40 contract employees. During the year ended December 31, 2013, the Company recorded approximately $3.4 million of employee separation charges related to the KSS Plan. Additionally, the Company recognized a multi-employer pension plan withdrawal liability of $3.1 million related to the KSS Plan. The company expects to record additional KSS Plan severance costs and related employee benefit plan expenses of approximately $8.3 million along with other exit costs of approximately $1.0 million to $2.0 million, offset by a pension curtailment gain of approximately $2.1 million through the end of 2014.
	As of December 31, 2013, the accrued liability associated with employee separation charges was $6.2 million for the KSS Plan.
	The decision to close the KSS facility triggered an impairment test to determine recoverability of the carrying value of the related long-lived assets, including certain held-for-sale properties. See Note 13: "Fair Value Measurements" for additional information.

Balance_Sheet_Information

Balance Sheet Information	12 Months Ended
	Dec. 31, 2013
Balance Sheet Related Disclosures [Abstract]	'
Balance Sheet Information	'
	Balance Sheet Information
	Certain significant amounts included in the Company's balance sheet as of December 31, 2013 and December 31, 2012 consist of the following (dollars in millions):
		December 31, 2013				December 31, 2012
	Receivables, net:
	Accounts receivable	$	384.4			$	360.5
	Less: Allowance for doubtful accounts	(1.0		)		(2.7		)
		$	383.4			$	357.8
	Inventories:
	Raw materials	$	89.2			$	73.2
	Work in process	319.6				310.9
	Finished goods	203				197.6
		$	611.8			$	581.7
	Other Current Assets:
	Prepaid expenses	$	24.8			$	24.3
	Value added and other income tax receivables	31.7				34.3
	Other	32.8				63.6
		$	89.3			$	122.2
	Property, plant and equipment, net: (1)
	Land	$	52.3			$	67.4
	Buildings	467.7				572.4
	Machinery and equipment	1,918.40				1,979.40
	Total property, plant and equipment	2,438.40				2,619.20
	Less: Accumulated depreciation	(1,364.2		)		(1,515.9		)
		$	1,074.20			$	1,103.30
	Accrued expenses:
	Accrued payroll	$	91.3			$	102.9
	Sales related reserves	54.2				64.9
	Restructuring reserves	26.2				17.1
	Accrued pension liability	10.4				7.4
	Accrued interest	1.9				0.6
	Other	36.3				63.8
		$	220.3			$	256.7
	-1	Included in property, plant and equipment are $8.7 million of fixed assets that are held-for-sale as of December 31, 2013.
	Depreciation expense for property, plant and equipment, including amortization of capital leases, totaled $164.6 million, $180.8 million and $162.8 million for 2013, 2012 and 2011, respectively.
	As of December 31, 2013 and 2012, total property, plant and equipment included $41.8 million and $79.7 million, respectively, of assets financed under capital leases. Accumulated depreciation associated with these assets is included in total accumulated depreciation in the table above.
	Warranty Reserves
	The activity related to the Company's warranty reserves for 2011, 2012 and 2013 follows (in millions):
	Balance as of December 31, 2010		$	3.3
	Provision		4
	Usage		(1.5		)
	Balance as of December 31, 2011		5.8
	Provision		8.1
	Usage		(3.7		)
	Balance as of December 31, 2012		10.2
	Provision		4.4
	Usage		(8.6		)
	Balance as of December 31, 2013		$	6

LongTerm_Debt

Long-Term Debt	12 Months Ended
	Dec. 31, 2013
Long-term Debt, Unclassified [Abstract]	'
Long-Term Debt	'
	Long-Term Debt
	The Company's long-term debt consists of the following (dollars in millions):
		December 31, 2013				December 31, 2012
	Senior Revolving Credit Facility due 2018, interest payable quarterly at 2.00% and 0% respectively	$	120			$	—
	Loan with Japanese bank due 2014 through 2018, interest payable quarterly at 2.00% and 2.06%, respectively (1)	273.7				302
	2.625% Notes (net of discount of zero and $7.1 million, respectively) (2)	—				125.5
	2.625% Notes, Series B (net of discount of $21.7 million and $24.2 million, respectively) (3)	335.2				274.2
	1.875% Notes (4)	—				73.4
	Loan with Hong Kong bank, interest payable weekly at 1.91% and 1.96%, respectively (6)	40				30
	Loans with Philippine banks due 2014 through 2015, interest payable monthly and quarterly at an average rate of 2.16% and 1.97%, respectively (8)	39.2				45.8
	Loan with Chinese bank due 2014, interest payable quarterly at 3.34% and 3.41%, respectively (9)	7				7
	Loan with Japanese bank due 2013, interest payable monthly at 0.00% and 1.58%, respectively (9)	—				0.8
	Loan with Singapore bank, interest payable weekly at 1.94% and 1.95%, respectively (6)	15				15
	Loan with British finance company, interest payable monthly at 1.57% and 1.51%, respectively (6)	0.2				3.3
	U.S. real estate mortgages payable monthly through 2016 at an average rate of 4.86% (7)	28.1				29.8
	U.S. equipment financing payable monthly through 2016 at 2.94% (5)	9.5				14
	Canada equipment financing payable monthly through 2017 at 3.81% (5)	5.9				—
	Canada revolving line of credit, interest payable quarterly at 1.84% (9)	15				—
	Capital lease obligations	53.4				91.1
	Long-term debt, including current maturities	942.2				1,011.90
	Less: Current maturities	(181.6		)		(353.6		)
	Long-term debt	$	760.6			$	658.3
	_______________________
	-1	This loan represents SCI LLC's unsecured loan with SMBC, which is guaranteed by the Company. See additional information below under the heading "Note Payable to SMBC."
	-2	The 2.625% Notes were redeemed by the Company on December 20, 2013.
	-3	The 2.625% Notes, Series B may be put back to the Company at the option of the holders of the notes on December 15 of 2016 and 2021 or called at the option of the Company on or after December 20, 2016.
	-4	The 1.875% Notes were partially redeemed by the Company on December 20, 2012. The balance as of December 31, 2012 for notes submitted for conversion was subject to a 20 consecutive trading-day observation period and was subsequently settled during January 2013.
	-5	Debt arrangement secured by equipment.
	-6	Debt arrangement secured by accounts receivable.
	-7	Debt arrangement secured by real estate.
	-8	$15.0 million unsecured and $24.2 million secured by equipment and $7.5 million unsecured and $38.3 million secured by equipment, respectively.
	-9	Unsecured debt arrangement.
	Annual maturities relating to the Company’s long-term debt as of December 31, 2013 are as follows (in millions):
			Annual
			Maturities
	2014		181.6
	2015		74
	2016		424.9
	2017		39
	2018		243.5
	Thereafter		0.9
	Total		$	963.9
	For purposes of the table above, the convertible debt is assumed to mature at the first put date.
	Redemption, Conversion and Retirement of Debt
	2.625% Notes
	On December 20, 2013, the Company exercised its option to redeem all of its remaining outstanding 2.625% Notes and paid the gross principal amount of approximately $72.6 million to the holders of the 2.625% Notes to retire the outstanding obligation.
	1.875% Notes
	On January 28, 2013, the Company settled the conversion obligation on the outstanding 1.875% Notes by delivering approximately $77.5 million in cash to the holders who tendered their 1.875% Notes for conversion. The excess $4.1 million over the $73.4 million in aggregate outstanding principal amount of the 1.875% Notes was attributable to the conversion feature of the 1.875% Notes and was recorded as a reduction to additional paid-in capital during the year ended December 31, 2013. The settlement of the conversion obligation on January 28, 2013 resulted in the retirement of the obligation under the 1.875% Notes.
	On December 20, 2012, the Company redeemed approximately $21.6 million of the outstanding aggregate principal amount of the 1.875% Notes at par value plus accrued interest.
	On December 19, 2012, the holders of approximately $73.4 million in aggregate outstanding principal amount of the 1.875% Notes submitted their 1.875% Notes for conversion at a rate of 142.8571 shares of the Company's common stock per $1,000 principal amount of their 1.875% Notes. The Company elected to satisfy its conversion obligation with respect to each $1,000 principal amount of notes tendered for conversion by delivering cash equal to the sum of the daily settlement amount for each of the 20 consecutive trading days during the observation period for the 1.875% Notes on the settlement date, as provided for in the Indenture.
	Loss on Debt Repurchase or Exchange
	As further described below, the Company recognized a net loss of $3.1 million, $7.8 million and $23.2 million for the years ended December 31, 2013, 2012 and 2011, respectively, for the exchange or repurchase of certain of its convertible senior subordinated notes.
	2013 Exchange
	On March 22, 2013, the Company closed an exchange offer for $60.0 million in principal value (approximately $57.4 million of carrying value) of its 2.625% Notes in exchange for $58.5 million in principal value of its 2.625% Notes, Series B, plus accrued and unpaid interest on the 2.625% Notes. Subject to certain other terms and conditions, this exchange extended the first put date, which the Company considers to be the earliest maturity date, for the exchanged amount from December 2013 to December 2016. The exchanged amount of the 2.625% Notes, Series B was allocated between the fair value of the liability component and equity component of the convertible security. The amount allocated to the extinguishment of the liability component was based on the discounted cash flows using a rate of return an investor would have required on non-convertible debt with other terms substantially similar to the 2.625% Notes. The remaining consideration was recognized as re-acquisition of the equity component.
	The difference between the consideration allocated to the liability component and the remaining net carrying amount of the liability and unamortized debt issuance costs was recorded as a loss on debt exchange of $3.1 million, which included the write-off of approximately $0.2 million in unamortized debt issuance costs. The Company also recorded an adjustment to additional paid-in capital of approximately $5.9 million, net of adjustments, relating to the exchange of equity components.
	2012 Exchange
	On September 4, 2012, the Company exchanged $99.9 million in par value ($92.8 million of carrying value) of its 2.625% Notes for $99.9 million in par value of 2.625% Notes, Series B and $2.0 million in cash. Subject to certain other terms and conditions, this exchange extended the first put date, which the Company considers to be the earliest maturity date, for the exchanged amount from December 2013 to December 2016. The cash payment and the $99.9 million of the 2.625% Notes, Series B were allocated between the fair value of the liability component and the equity component of the convertible security. The amount allocated to the extinguishment of the liability component was based on the discounted cash flows using a rate of return an investor would have required on non-convertible debt with other terms substantially similar to the 2.625% Notes. The remaining consideration was recognized as re-acquisition of the equity component.
	The difference between the consideration allocated to the liability component and the rest of the net carrying amount of the liability and unamortized debt issuance costs was recorded as a loss on debt exchange of $7.8 million, which included the write-off of $0.6 million in unamortized debt issuance costs. The Company also recorded an adjustment to additional paid-in capital in the amount of $1.9 million for the re-acquisition of the equity component.
	2011 Exchange
	During the year ended December 31, 2011, the Company exchanged $198.6 million in par value ($177.2 million of carrying value) of its 2.625% Notes for $198.6 million in par value ($176.4 million of carrying value) of 2.625% Notes, Series B and $15.9 million in cash. Subject to certain other terms and conditions, this exchange extended the earliest debt maturity date, which the Company considers to be the first put date, for the exchanged amount from December 2013 to December 2016. The cash payment and the $198.6 million of 2.625% Notes, Series B were allocated between the fair value of the liability component and the equity component of the convertible security. The amount allocated to the extinguishment of the liability component was based on the discounted cash flows using a rate of return an investor would have required on non-convertible debt with other terms substantially similar to the 2.625% Notes. The remaining consideration was recognized as re-acquisition of the equity component.
	The difference between the consideration allocated to the liability component and the rest of the net carrying amount of the liability and unamortized debt issuance costs was recorded as a loss on debt repurchase of $17.9 million, which included the write-off of $1.7 million in unamortized debt issuance costs. The Company also recorded an adjustment to additional paid-in capital in the amount of $21.0 million for the re-acquisition of the equity component.
	2011 Repurchase
	During the year ended December 31, 2011, the Company repurchased $53.0 million in par value ($46.6 million of carrying value) of its 2.625% Notes for $56.2 million in cash. The cash payment was allocated between the fair value of the liability component and the equity component of the convertible security. The amount allocated to the extinguishment of the liability component was based on the discounted cash flows using a rate of return an investor would have required on non-convertible debt with other terms substantially similar to the 2.625% Notes. The remaining consideration was recognized as re-acquisition of the equity component.
The difference between the consideration allocated to the liability component and the rest of the net carrying amount of the liability and unamortized debt issuance costs was recorded as a loss on debt repurchase of $5.3 million, which included the write-off of $0.5 million in unamortized debt issuance costs. The Company also recorded an adjustment to additional paid-in capital in the amount of $4.8 million for the re-acquistion of the equity component.
Note Payable to SMBC
In January 2011, SCI LLC, as borrower, and the Company, as guarantor, entered into a seven-year, unsecured loan agreement with SANYO Electric to finance a portion of the purchase price for the Company's acquisition of SANYO Semiconductor and certain related assets in early 2011. The loan had an original principal amount of approximately $377.5 million and had a principal balance of $273.7 million and $302.0 million as of December 31, 2013 and December 31, 2012, respectively. The loan bears interest at a rate of 3-month LIBOR plus 1.75% per annum and provides for quarterly interest and $9.4 million in principal payments, with the unpaid balance of $122.7 million due in January 2018.
On January 31, 2013, the Company amended and restated its seven-year unsecured 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.
Amended and Restated Senior Revolving Credit Facility
The Company and its wholly-owned subsidiary, SCI LLC, entered into an $800.0 million, five-year senior revolving credit facility (the “Facility”), the terms of which are set forth in an Amended and Restated Credit Agreement dated as of October 10, 2013 (“Credit Agreement”) among the Company and a group of lenders. The new Credit Agreement amends and restates the Company’s prior credit agreement, dated as of December 23, 2011. The Facility may be used for general corporate purposes including working capital, stock repurchase, and/or acquisitions. The Company recorded $3.2 million of debt issuance costs associated with the Facility.
The Facility includes $40.0 million availability for the issuance of letters of credit, $15.0 million availability for swingline loans for short-term borrowings and a foreign currency sublimit of $75.0 million. The Company has the ability to increase the size of the Facility in increments of $10.0 million provided that the aggregate amount of such increases does not exceed $250.0 million.
Payments of the principal amounts of revolving loans under the Credit Agreement are due no later than October 10, 2018, which is the maturity date of the Facility. Interest is payable based on either a LIBOR or base rate option, plus an applicable rate that varies based on the total leverage ratio. The Company has also agreed to pay the lenders certain fees, including a commitment fee that varies based on the total leverage ratio. The Company may prepay loans under the Credit Agreement at any time, in whole or in part, upon payment of accrued interest and break funding payments, if applicable.
The obligations under the Facility are guaranteed by certain of the Company's domestic subsidiaries and SCI LLC and are secured by a pledge of the equity interests in certain of the Company's and SCI LLC's domestic subsidiaries and material first tier foreign subsidiaries.
The Credit Agreement contains affirmative and negative covenants that are customary for credit agreements of this nature. The negative covenants include, among other things, limitations on asset sales, mergers and acquisitions, indebtedness, liens, investments and transactions with affiliates. The Credit Agreement contains only two financial covenants: (i) a maximum total leverage ratio of consolidated total indebtedness to consolidated earnings before interest, taxes, depreciation and amortization and other adjustments described in the Credit Agreement ("consolidated EBITDA") for the trailing four consecutive quarters of 3.75 to 1.00; and (ii) a minimum interest coverage ratio of consolidated EBITDA to consolidated interest expense for the trailing four consecutive quarters of 3.50 to 1.0.
The Credit Agreement contains customary events of default that include, among other things, non-payment defaults, inaccuracy of representations and warranties, covenant defaults, cross default to material indebtedness, bankruptcy and  insolvency defaults, material judgment defaults, ERISA defaults and a change of control default. The occurrence of an event of default could result in the acceleration of the obligations under the Credit Agreement. The Company was in compliance with the various covenants contained in the Credit Agreement as of December 31, 2013 and expects to remain in compliance with all covenants over at least the next twelve months.
During the fourth quarter of 2013, the Company drew $120.0 million, for general corporate purposes, available pursuant to the Facility, which remained outstanding as of December 31, 2013, in addition to a letter of credit in the amount of $0.2 million. Included in other assets as of December 31, 2013 were $4.4 million of debt issuance costs associated with the Facility.
In the ordinary course of their respective businesses, certain of the lenders and other parties to the Credit Agreement and their respective affiliates have engaged, and may engage, in commercial banking, investment banking, financial advisory or other services with the Company, SCI LLC, and any of their affiliates for which they have in the past and/or may in the future receive customary compensation and expense reimbursement.
Description of 2.625% Notes, Series B
As discussed above, the Company completed the following exchange offers for its 2.625% Notes in exchange for its 2.625% Notes, Series B. Subject to certain other terms and conditions, these exchanges extended the debt maturity for the exchanged amounts from December 2013 to December 2016. The 2.625% Notes, Series B bear interest at the rate of 2.625% per year from the date of issuance. Interest is payable on June 15 and December 15 of each year. The 2.625% Notes, Series B are fully and unconditionally guaranteed on an unsecured senior subordinated basis by certain existing domestic subsidiaries of the Company (dollars in millions):
		For the years ended December 31,
		2013				2012			2011
Exchange date		22-Mar-13				4-Sep-12			15-Dec-11
Principal value of 2.625% Notes		$	60			$	99.9		$	198.6
Principal value of 2.625% Notes, Series B		$	58.5			$	99.9		$	198.6
Cash consideration		$	—			$	2		$	15.9
Capitalized exchange expenses (1)		$	0.1			$	0.6		$	1.4
Effective interest rate		4.7		%		4.4		%	5.25		%
(1)     Represents exchange expenses capitalized as debt issuance costs that are amortized using the effective
interest method through the first put date of December 15, 2016.
The 2.625% Notes, Series B are convertible by holders into cash and shares of the Company's common stock at a conversion rate of 95.2381 shares of common stock per $1,000 principal amount of notes (subject to adjustment in certain events), which was equivalent to an initial conversion price of approximately $10.50 per share of common stock. The Company will settle conversion of all notes validly tendered for conversion in cash and shares of the Company's common stock, if applicable, subject to the Company's right to pay the share amount in additional cash. Holders had the option to convert their 2.625% Notes, Series B under the following circumstances: (i) 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 notes for each day of such period was less than 103% of the product of the closing sale price of the Company's common stock and the conversion rate; (ii) upon occurrence of the specified transactions described in the Indenture relating to the 2.625% Notes, Series B; or (iii) after June 15, 2016. The Company determined that the conversion option based on a trading price condition meets the definition of a derivative, and should be bifurcated from the debt host and accounted for separately. However, the fair value of this feature was determined to be de minimis at the date of issuance and the Company continued to evaluate the significance of this feature on a quarterly basis.
The 2.625% Notes, Series B are to mature on December 15, 2026. Beginning December 20, 2016, the Company could redeem the 2.625% Notes, Series B, in whole or in part, for cash at a price of 100% of the principal amount plus accrued and unpaid interest to, but excluding, the redemption date. If a holder elected to convert its 2.625% Notes, Series B in connection with the occurrence of specified fundamental changes that occur prior to December 15, 2016, the holder would have been entitled to receive, in addition to cash and shares of common stock equal to the conversion rate, an additional number of shares of common stock, in each case as described in the Indenture. Notwithstanding these conversion rate adjustments, these 2.625% Notes, Series B contain an explicit limit on the number of shares issuable upon conversion. Holders may require the Company to repurchase the 2.625% Notes, Series B for cash on December 15, 2016 and 2021 at a repurchase price equal to 100% of the principal amount of such 2.625% Notes, Series B, plus accrued and unpaid interest, to, but excluding, the repurchase date. Upon the occurrence of certain corporate events, each holder could have required the Company to purchase all or a portion of such holder's 2.625% Notes, Series B for cash at a price equal to the principal amount of such notes, plus accrued and unpaid interest, to, but excluding, the repurchase date.
Included in other assets as of December 31, 2013 were $1.3 million of debt issuance costs associated with the 2.625% Notes, Series B, which will be amortized using the effective interest method through 2016. Included in long-term debt as of December 31, 2013 was $21.7 million of unamortized debt discount associated with the 2.625% Notes, Series B, which will be amortized using the effective interest method through 2016.
Canada Revolving Line of Credit
On August 30, 2013, one of the Company's wholly-owned Canadian subsidiaries and SCI LLC, as guarantor, entered into an unsecured and uncommitted $15.0 million line of credit (the "Line of Credit"), the terms of which were set forth in an agreement by and between the Company's Canadian subsidiary and a U.S. bank. During the year ended December 31, 2013, the Company's Canadian subsidiary borrowed the full $15.0 million available under the Line of Credit. The borrowing under the Line of Credit bears interest based on an option of 1-month, 2-month, 3-month or 6-month LIBOR plus 1.60% per annum, with interest payable quarterly. The borrowed amount is payable within three business days of demand.
Capital Lease Obligations
The Company has various capital lease obligations primarily for machinery and equipment, which as of December 31, 2013 totaled $53.4 million, with interest rates ranging from 2.0% to 5.2% and maturities from the first quarter of 2014 until the fourth quarter of 2019.
Debt Guarantees
ON Semiconductor was the sole issuer of the 1.875% Notes and the 2.625% Notes and is the sole issuer of the 2.625% Notes, Series B (collectively, the “Convertible Notes”). See Note 20: "Guarantor and Non-Guarantor Statements" for the condensed consolidated financial information for the issuer of the Convertible Notes and the Guarantor Subsidiaries and the Non-Guarantor Subsidiaries (as defined in Note 20: "Guarantor and Non-Guarantor Statements") for further information.

Earnings_Per_Share_and_Equity

Earnings Per Share and Equity	12 Months Ended
	Dec. 31, 2013
Stockholders' Equity Note [Abstract]	'
Earnings Per Share and Equity	'
	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):
		For the years ended December 31,
		2013			2012			2011
	Net income (loss) attributable to ON Semiconductor Corporation	$	150.8		$	(90.6	)	$	11.6
	Basic weighted average common shares outstanding	447.9			452.6			446.7
	Add: Incremental shares for:
	Dilutive effect of share-based awards	2.8			—			7.6
	Dilutive effect of convertible notes	—			—			2.9
	Diluted weighted average common shares outstanding	450.7			452.6			457.2
	Net income (loss) per common share attributable to ON Semiconductor Corporation:
	Basic	$	0.34		$	(0.20	)	$	0.03
	Diluted	$	0.33		$	(0.20	)	$	0.03
	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 restricted stock units 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 share-based awards were approximately 12.3 million, 15.7 million and 11.7 million for the years ended December 31, 2013, 2012 and 2011, respectively.
	The dilutive impact related to the Convertible Notes is determined in accordance with the net share settlement requirements prescribed by ASC Topic 260, Earnings Per Share ("ASC 260"). Under the net share settlement calculation, the 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 of the Convertible Notes. In periods when the stock 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. See Note 8: "Long-Term Debt" for a discussion of the conversion prices and other features of the Convertible Notes.
	Equity
	Share Repurchase Program
	Information relating to the Company's share repurchase program is as follows (in millions, except per share data):
		For the years ended December 31,
		2013			2012
	Number of repurchased shares (1)	13.9			8.8
	Aggregate purchase price	$	101.3		$	55.3
	Fees, commissions and other expenses	0.3			0.2
	Less: accrued share repurchases (2)	(0.6		)	—
	Total cash used for share repurchases	$	101		$	55.5
	Weighted-average purchase price per share	$	7.29		$	6.26
	Available for future purchases at period end	$	143.4		$	244.7
	(1)    None of these shares had been reissued or retired as of December 31, 2013, but may be reissued or retired by
	the Company at a later date.
	(2)    Represents unpaid amounts recorded in accrued expenses on the Company's Consolidated Balance Sheet.
	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 restricted stock units 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 in the years ended December 31, 2013 and 2012 were $4.5 million and $9.6 million, respectively, for which the Company withheld approximately 0.6 million and 1.1 million shares of common stock, respectively, that were underlying the restricted stock units that vested. None of these shares had been reissued or retired as of December 31, 2013, but may be reissued or retired by the Company at a later date.
	Non-Controlling Interest
	The Company's entity which operates assembly and test operations in Leshan, China is owned by a joint venture company, Leshan-Phoenix Semiconductor Company Limited (“Leshan”). The Company owns a majority of the outstanding equity interests in Leshan and its investment in Leshan has been consolidated in the Company's financial statements.
	At December 31, 2012, the non-controlling interest balance was $29.6 million. This balance was increased to $32.8 million at December 31, 2013 due to the non-controlling interest's $3.2 million share of the earnings for the year ended December 31, 2013.
	At December 31, 2011, the non-controlling interest balance was $25.3 million. This balance increased to $29.6 million at December 31, 2012 due to the non-controlling interest's $4.3 million share of the earnings for the year ended December 31, 2012.

ShareBased_Compensation

Share-Based Compensation	12 Months Ended
	Dec. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]	'
Share-Based Compensation	'
	Share-Based Compensation
	Total share-based compensation expense related to the Company's employee stock options, restricted stock units, stock grant awards and ESPP for the years ended December 31, 2013, 2012 and 2011 was comprised as follows (in millions):
			Year Ended December 31, 2013				Year Ended December 31, 2012				Year Ended December 31, 2011
	Cost of revenues		$	5.3			$	3.7			$	6.3
	Research and development		6.3				4.5				6.9
	Selling and marketing		5.7				4.3				6.4
	General and administrative		15				8				13.9
	Restructuring		—				—				—
	Share-based compensation expense before income taxes		32.3				20.5				33.5
	Related income tax benefits (1)		—				—				—
	Share-based compensation expense, net of taxes		$	32.3			$	20.5			$	33.5
	____________________
	-1	A majority of the Company’s share-based compensation relates to its domestic subsidiaries; therefore, no related deferred income tax benefits are recorded due to historical net operating losses at those subsidiaries.
	At December 31, 2013, total unrecognized estimated share-based compensation expense, net of estimated forfeitures, related to non-vested stock options granted prior to that date was $5.5 million, which is expected to be recognized over a weighted-average period of 2.2 years. At December 31, 2013, total unrecognized share-based compensation expense, net of estimated forfeitures, related to non-vested restricted stock units with time-based service conditions and performance-based vesting criteria granted prior to that date was $38.4 million. The total intrinsic value of stock options exercised during the year ended December 31, 2013 was $4.3 million. The Company recorded cash received from the exercise of stock options of $12.1 million and cash from the issuance of shares under the ESPP of $8.3 million and no related tax benefits during the year ended December 31, 2013. Upon option exercise, release of restricted stock units, stock grant awards, or completion of a purchase under the ESPP, the Company issues new shares of common stock.
	Share-Based Compensation Information
	The fair value of each option grant is estimated on the date of grant using a lattice-based option valuation model. The lattice-based model uses: (1) a constant volatility; (2) an employee exercise behavior model (based on an analysis of historical exercise behavior); and (3) the treasury yield curve to calculate the fair value of each option grant.
	The weighted-average estimated fair value of employee stock options and the weighted-average assumptions used in the lattice model to calculate the weighted-average estimated fair value of employee stock options granted during the years ended December 31, 2013, 2012 and 2011 are as follows (annualized percentages):
			Year Ended December 31, 2013				Year Ended December 31, 2012				Year Ended December 31, 2011
	Volatility		42.8		%		46.9		%		52.1		%
	Risk-free interest rate		1.4		%		0.8		%		1.2		%
	Expected term		5.2 years				5.0 years				4.8 years
	Weighted-average fair value per option		$	2.93			$	3.01			$	3.88
	The volatility input is developed using blended volatility. The expected term of options represents the period of time that the options are expected to be outstanding and is computed using the lattice model's estimated option fair value as an input to the Black-Scholes formula and solving for expected term. The risk-free rate is based on zero-coupon U.S. Treasury yields in effect at the date of grant with the same period as the expected term.
	Share-based compensation expense recognized in the Consolidated Statement of Operations and Comprehensive Income is based on awards ultimately expected to vest. Forfeitures are estimated at the time of grant and revised, if necessary, in subsequent periods if actual forfeitures differ from those estimates. Pre-vesting forfeitures for stock options were estimated to be approximately 11%, 11% and 11% in the years ended December 31, 2013, 2012 and 2011, respectively. Pre-vesting forfeitures for restricted stock units were estimated to be approximately 5%, 4% and 8% in the years ended December 31, 2013, 2012 and 2011, respectively.
	Plan Descriptions
	On February 17, 2000, the Company adopted the 2000 Stock Incentive Plan (the "2000 SIP") which provided key employees, directors and consultants with various equity-based incentives as described in the plan document. Prior to February 17, 2010, stockholders had approved amendments to the 2000 SIP which increased the number of shares of the Company's common stock reserved and available for grant to 30.5 million, plus an additional number of shares of the Company's common stock equal to 3% of the total number of outstanding shares of common stock effective automatically on January 1st of each year beginning January 1, 2005 and ending January 1, 2010. On February 17, 2010, the 2000 SIP expired and the Company ceased granting under the plan. Options granted pursuant to the 2000 SIP that remain outstanding continue to be exercisable or subject to vesting pursuant to the underlying option agreements.
	On March 23, 2010, the Company adopted the Amended and Restated SIP, which was subsequently approved by the Company's shareholders at the annual shareholder meeting on May 18, 2010. The Amended and Restated SIP provides key employees, directors and consultants with various equity-based incentives as described in the plan document. The Amended and Restated SIP is administered by the Board of Directors or a committee thereof, which is authorized to determine, among other things, the key employees, directors or consultants who will receive awards under the plan, the amount and type of award, exercise prices or performance criteria, if applicable, and vesting schedules. On May 15, 2012, shareholders approved certain amendments to the Amended and Restated SIP to increase the number of shares of common stock subject to all awards under the Amended and Restated SIP by 33.0 million to 59.1 million, exclusive of shares of common stock subject to awards that were previously granted pursuant to the 2000 SIP that have or will become available for grant pursuant to the Amended and Restated SIP.
	Generally, the options granted under the 2000 SIP and Amended and Restated SIP vest over a period of three to four years and have a term of 10 years and 7 years, respectively. Under both plans, certain outstanding options vest automatically upon a change of control, as defined in the respective plan document, provided the option holder is employed by the Company on the date of the change in control. Certain other outstanding options may also vest upon a change of control if the Board of Directors of the Company, at its discretion, provides for acceleration of the vesting of said options. Upon the termination of an option holder's employment, all unvested options will immediately terminate and vested options will generally remain exercisable for a period of 90 days after the date of termination (one year in the case of death or disability), unless otherwise specified in an option holder's employment or stock option agreement.
	Generally, restricted stock units granted under the 2000 SIP and the Amended and Restated SIP vest over three to four years or based on the achievement of certain performance criteria and are payable in shares of the Company's stock upon vesting.
	As of December 31, 2013, there was an aggregate of 37.4 million shares of common stock available for grant under the Amended and Restated SIP.
	Stock Options
	A summary of stock option transactions for all stock option plans follows (in millions except per share and term data):
			Year Ended December 31, 2013
			Number of Shares			Weighted-Average Exercise Price				Weighted Average Remaining Contractual Term (in years)		Aggregate Intrinsic Value
	Outstanding at December 31, 2012		17.2			$	7.7
	Granted		0.1			7.39
	Exercised		(2.1	)		5.82
	Canceled		(1.2	)		8.67
	Outstanding at December 31, 2013		14			$	7.89			3.4		$	14.8
	Exercisable at December 31, 2013		11.6			$	7.99			3.1		$	12.4
	As of December 31, 2013, the Company had 13.7 million of outstanding stock options, representing stock options that previously vested and those which are expected to vest, with a weighted-average exercise price of $7.91.
	Net stock options, after forfeitures and cancellations, granted during the years ended December 31, 2013 and December 31, 2012 represented (0.24)% and 0.07% of outstanding shares as of the beginning of each such fiscal year, respectively. Total stock options granted during the years ended December 31, 2013 and December 31, 2012 represented 0.03% and 0.62% of outstanding shares as of the end of each such fiscal year, respectively.
	Additional information about stock options outstanding at December 31, 2013 with exercise prices less than or above $8.24 per share, the closing price of the Company's common stock at December 31, 2013, follows (number of shares in millions):
			Exercisable							Unexercisable					Total
	Exercise Prices		Number of Shares			Weighted Average Exercise Price				Number of Shares			Weighted Average Exercise Price		Number of Shares	Weighted Average Exercise Price
	Less than $8.24		6.2			$	6.23			1.6			$	6.75	7.8	$	6.33
	Above $8.24		5.4			$	9.97			0.8			$	8.86	6.2	$	9.82
	Total outstanding		11.6			$	7.99			2.4			$	7.45	14	$	7.89
	Restricted Stock Units
	During 2013, the Company awarded 1.6 million restricted stock units to certain officers and employees of the Company that vest upon the achievement of certain performance criteria. The number of units expected to vest is evaluated each reporting period and compensation expense is recognized for those units for which achievement of the performance criteria is considered probable.
	Compensation expense of $18.2 million was recognized during 2013 for all restricted stock units with time-based service conditions that were granted in 2013 and prior that are expected to vest.
	A summary of the restricted stock units transactions for the year ended December 31, 2013 follows (number of shares in millions):
			Year Ended December 31, 2013
			Number of Shares			Weighted-Average Grant Date Fair Value
	Nonvested shares of restricted stock units at December 31, 2012		8.9			$	8.75
	Granted		5.3			7.91
	Released		(2.3	)		7.83
	Canceled		(1.1	)		8.87
	Nonvested shares of restricted stock units at December 31, 2013		10.8			$	8.52
	As of December 31, 2013, unrecognized compensation expense, net of estimated forfeitures related to non-vested restricted stock units granted under the 2000 SIP and Amended and Restated SIP with time-based and performance-based conditions, was $34.2 million and $4.2 million, respectively. For restricted stock units with time-based service conditions, expense is being recognized over the vesting period; for restricted stock units with performance criteria, expense is recognized over the period during which the performance criteria is expected to be achieved. Unrecognized compensation cost related to awards with certain performance criteria that are not expected to be achieved is not included here. Total compensation expense related to both performance-based and service-based restricted stock units was $25.0 million for the year ended December 31, 2013.
	Stock Grant Awards
	During the year ended December 31, 2013, the Company granted 0.2 million shares of stock under stock grant awards to certain directors of the Company with immediate vesting at a weighted-average grant date fair value of $8.49 per share. Total compensation expense related to stock grant awards for the year ended December 31, 2013 was approximately $1.4 million.
	Employee Stock Purchase Plan
On February 17, 2000, the Company adopted the ESPP. Subject to local legal requirements, each of the Company's eligible employees may elect to contribute up to 10% of eligible payroll applied towards the purchase of shares of the Company's common stock at a price equal to 85% of the fair market value of such shares as determined under the plan. Employees are limited to annual purchases of $25,000 under this plan. In addition, during each quarterly offering period, employees may not purchase stock exceeding the lesser of (i) 500 shares, or (ii) the number of shares equal to $6,250 divided by the fair market value of the stock on the first day of the offering period. During the year ended December 31, 2013, employees purchased approximately 1.3 million shares under the ESPP. During the years ended December 31, 2012 and 2011, employees purchased for each such year approximately 1.4 million and 1.2 million shares, respectively, under the ESPP. Through May 2009, shareholders had approved amendments to the ESPP, which have increased the number of shares of the Company's common stock issuable thereunder to 15.0 million shares. On May 15, 2013, shareholders approved certain amendments to the Company's ESPP which increased the number of shares reserved and available to be issued pursuant to the ESPP by 3.0 million to a total of 18.0 million. As of December 31, 2013, there were 4.3 million shares available for issuance under the ESPP.

Employee_Benefit_Plans

Employee Benefit Plans	12 Months Ended
	Dec. 31, 2013
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]	'
Employee Benefit Plans	'
	Employee Benefit Plans
	Defined Benefit Plans
	The Company maintains defined benefit plans for employees of certain of its foreign subsidiaries. Such plans conform to local practice in terms of providing minimum benefits mandated by law, collective agreements or customary practice. 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. The Company's expected long-term rate of return on plan assets is updated at least annually, taking into consideration its asset allocation, historical returns on similar types of assets and the current economic environment. For estimation purposes, the Company assumes its long-term asset mix will generally be consistent with the current mix. The Company determines its discount rates using highly rated corporate bond yields and government bond yields.
	Benefits under all of the Company's plans are valued utilizing the projected unit credit cost method. The Company's policy is to fund its defined benefit plans in accordance with local requirements and regulations. The funding is primarily driven by the Company's current assessment of the economic environment and projected benefit payments of its foreign subsidiaries. The Company's measurement date for determining its defined benefit obligations for all plans is December 31 of each year.
	The Company recognizes actuarial gains and losses in the period the Company's annual pension plan actuarial valuations are prepared which generally occurs during the fourth quarter of each year, or during any interim period where a revaluation is deemed necessary.
	2013 Activity and Effect of Voluntary Retirement Programs
	The Q1 2013 Voluntary Retirement Program for certain employees of the System Solutions Group triggered the re-measurement of the related pension assets and liabilities, resulting in an actuarial loss of $13.6 million for the year ended December 31, 2013. Additionally, the Company recorded a curtailment gain of $12.7 million, for the year ended December 31, 2013, in Restructuring, Asset Impairments and Other, net.
	The Q4 2013 Voluntary Retirement Program resulted in an actuarial gain of $7.4 million for the year ended December 31, 2013. Additionally, the Company recorded a curtailment gain of $2.9 million, for the year ended December 31, 2013, in Restructuring, Asset Impairments and Other, net.
	See Note 6: "Restructuring, Asset Impairments and Other, net" for additional information.
	2012 Activity
	During the year ended December 31, 2012, the Company completed the withdrawal from three multi-employer pension plans in which certain of its System Solutions Group subsidiaries participated. As a result of the withdrawal, defined benefit plans established by the Company assumed approximately $214.5 million of pension benefit obligations and received $83.6 million of plan assets. The net unfunded pension obligation of $130.9 million approximated the withdrawal liability previously established by the Company. The Company recognized expense of $10.7 million and $16.4 million during the years ended December 31, 2012 and 2011, respectively, relating to its participation in these plans through their respective withdrawal dates. The activity for these plans prior to their withdrawal dates is not included in the tables below.
	During the year-ended December 31, 2012, the Company modified a defined benefit plan which resulted in a freezing of accumulated benefits and the ceased accrual of benefits from future service for all plan participants. Furthermore, the Company initiated a defined contribution plan covering employees impacted by the plan modification and designated $7.5 million on behalf of participants in the defined contribution plan.
	The following is a summary of the status of the Company's foreign defined benefit pension plans and the net periodic pension cost (dollars in millions):
			Year Ended December 31,
			2013			2012			2011
	Service cost		$	12.2		$	7.5		$	9.4
	Interest cost		6.6			5.3			5.2
	Expected return on plan assets		(4.1		)	(3.5		)	(4.0		)
	Amortization of prior service cost		—			0.1			2.6
	Curtailment (gain) loss		(15.6		)	(6.6		)	2
	Actuarial and other loss (gain)		6.2			12.5			(3.1		)
	Total net periodic pension cost		$	5.3		$	15.3		$	12.1
	Weighted average assumptions
	Discount rate		2.14		%	2.44		%	3.5		%
	Expected return on plan assets		2.18		%	3.21		%	4.07		%
	Rate of compensation increase		3.17		%	3.05		%	4.66		%
			December 31,
			2013			2012
	Change in projected benefit obligation
	Projected benefit obligation at the beginning of the year		$	379.8		$	176.4
	Benefit obligation assumed upon withdrawal from Systems Solutions Group multi-employer plans		—			214.5
	Service cost		12.2			7.5
	Interest cost		6.6			5.3
	Net actuarial loss		14.3			13.9
	Benefits paid by plan assets		(22.3		)	(13.3		)
	Benefits paid by the Company		(32.1		)	(11.4		)
	Curtailment gain		(15.6		)	(6.6		)
	Translation gain and other		(50.6		)	(6.5		)
	Projected benefit obligation at the end of the year		$	292.3		$	379.8
	Accumulated benefit obligation at the end of the year		$	254.9		$	281.2
	Change in plan assets
	Fair value of plan assets at the beginning of the year		$	178.4		$	105.5
	Assets assumed due to withdrawal from multi-employer plans		—			83.6
	Transfer to defined contribution plan		—			(7.5		)
	Actual return on plan assets		12.2			5.4
	Benefits paid from plan assets		(22.3		)	(13.3		)
	Employer contributions		16.2			6.6
	Translation and other loss		(21.1		)	(1.9		)
	Fair value of plan assets at the end of the year		$	163.4		$	178.4
	Plans with underfunded or non-funded accumulated benefit obligation
	Aggregate accumulated benefit obligation		$	220.7		$	248.8
	Aggregate fair value of plan assets		$	116.2		$	124.8
	Amounts recognized in the balance sheet consist of
	Non-current assets		$	0.6		$	0.2
	Current liabilities		(10.4		)	(7.4		)
	Non-current liabilities		(119.1		)	(194.2		)
	Funded status		$	(128.9	)	$	(201.4	)
	Amounts recognized in accumulated other comprehensive income consist of
	Prior service cost		$	—		$	0.1
	Weighted average assumptions at the end of the year
	Discount rate		2.14		%	2.44		%
	Rate of compensation increase		3.17		%	3.05		%
	As of December 31, 2013 and 2012, respectively, the assets of the Company's foreign plans were invested 18% and 0% in equity securities, 23% and 3% in debt securities, including corporate bonds, 46% and 25% in insurance and investment contracts, 4% and 62% in cash and 9% and 10% in other investments, including foreign government securities, equity securities and mutual funds. This asset allocation is based on the anticipated required funding amounts, timing of benefit payments, historical returns on similar assets and the influence of the current economic environment.
The long term rate of return on plan assets was determined using the weighted-average method, which incorporates factors that include the historical inflation, interest rate yield curve and current market conditions.
Plan Assets
The Company's overall investment strategy is to focus on stable and low credit risk investments aimed at providing a positive rate of return to the plan assets. The Company has an investment mix with a wide diversification of asset types and fund strategies that are aligned with each region and foreign location's economy and market conditions. Investments in government securities are generally guaranteed by the respective government offering the securities. Investments in corporate bonds, equity securities, and foreign mutual funds are made with the expectation that these investments shall give an adequate rate of long-term returns despite periods of high volatility. Other types of investments include investments in cash deposits, money market funds and insurance contracts. The Company invested certain of these holdings in a broader mix of assets during 2013.
The fair value measurement of plan assets in the Company's foreign pension plans as of December 31, 2013 and 2012, was as follows (in millions):
		December 31, 2013
		Total			Quoted Prices in Active Markets for Identical Assets (Level 1)			Significant Observable Inputs (Level 2)			Significant Unobservable Inputs (Level 3)
Asset Category
Cash/Money Markets		$	7.5		$	7.5		$	—		$	—
Foreign Government/Treasury Securities (1)		8.7			7.8			0.9			—
Corporate Bonds, Debentures (2)		36.8			17.9			18			0.9
Equity Securities (3)		29.4			19.9			9.5			—
Mutual Funds		5.8			—			5.8			—
Investment and Insurance Annuity Contracts (4)		75.2			—			27.3			47.9
		$	163.4		$	53.1		$	61.5		$	48.8
		December 31, 2012
		Total			Quoted Prices in Active Markets for Identical Assets (Level 1)			Significant Observable Inputs (Level 2)			Significant Unobservable Inputs (Level 3)
Asset Category
Cash/Money Markets		$	111.4		$	111.4		$	—		$	—
Foreign Government/Treasury Securities (1)		12.6			9			3.6			—
Corporate Bonds, Debentures (2)		4.4			0.4			0.7			3.3
Mutual Funds		4.6			—			4.6			—
Investment and Insurance Annuity Contracts (4)		45.4			—			0.7			44.7
		$	178.4		$	120.8		$	9.6		$	48
-1	Includes investments primarily in guaranteed return securities.
-2	Includes investments in government bonds and corporate bonds of developed countries, emerging market government bonds, emerging market corporate bonds and convertible bonds.
-3	Includes investments in equity securities of developed countries and emerging markets.
-4	Includes certain investments with insurance companies which guarantee a minimum rate of return on the investment.
When available, the Company uses observable market data, including pricing on recent closed market transactions and quoted prices, which are included in Level 2. When data is unobservable, valuation methodologies using comparable market data are utilized and included in Level 3. Activity during the year ended December 31, 2013 for plan assets with fair value measurement using significant unobservable inputs (Level 3) was as follows (in millions):
		Corporate Bonds, Debentures			Investment and Insurance Contacts			Total
Balance at December 31, 2011		$	4.1		$	1		$	5.1
Purchase, sales and settlements		(1.2		)	(0.3		)	(1.5		)
Transfers in and/or out of Level 3		0.4			44			44.4
Balance at December 31, 2012		$	3.3		$	44.7		$	48
Actual return on plan assets		—			3.5			3.5
Purchase, sales and settlements		(2.4		)	(0.3		)	(2.7		)
Balance at December 31, 2013		$	0.9		$	47.9		$	48.8
The expected benefit payments for the Company's defined benefit plans by year from 2014 through 2018 and the five years thereafter are as follows (in millions):
2014		$	44.4
2015		2.3
2016		2.3
2017		2.6
2018		3.5
5 years thereafter		46.9
Total		$	102
The total underfunded status was $128.9 million at December 31, 2013. The Company expects to contribute $14.8 million during 2014 to its foreign defined benefit plans in addition to $25.9 million of expected benefit payments.
Defined Contribution Plans
The Company has a deferred compensation savings plan for all eligible U.S. employees established under the provisions of Section 401(k) of the Internal Revenue Code. Eligible employees may contribute a percentage of their salary subject to certain limitations. The Company has elected to have a matching contribution of 100% of the first 4% of employee contributions. The Company recognized $8.4 million, $8.3 million and $8.7 million of expense relating to matching contributions in 2013, 2012 and 2011, respectively.
Certain foreign subsidiaries have defined contribution plans in which eligible employees participate. The Company recognized compensation expense of $4.1 million, $3.4 million and $2.0 million relating to these plans for the years ended 2013, 2012 and 2011, respectively.

Commitments_And_Contingencies

Commitments And Contingencies	12 Months Ended
	Dec. 31, 2013
Commitments and Contingencies Disclosure [Abstract]	'
Commitments And Contingencies	'
	Commitments and Contingencies
	Leases
	The following is a schedule by year of future minimum lease obligations under non-cancelable operating leases as of December 31, 2013 (in millions):
	Year Ending December 31,
	2014	$	18.4
	2015	13.9
	2016	10.8
	2017	8.7
	2018	13.6
	Thereafter	26
	Total	$	91.4
	The Company's existing leases do not contain significant restrictive provisions; however, certain leases contain renewal options and provisions for payment by the Company of real estate taxes, insurance and maintenance costs. Total rent expense associated with operating leases for 2013, 2012, and 2011 was $22.0 million, $24.0 million, and $27.7 million, respectively.
	Environmental Contingencies
	The Company’s headquarters in Phoenix, Arizona is 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. Motorola and Freescale have been involved in the cleanup of on-site solvent contaminated soil and groundwater and off-site contaminated groundwater pursuant to consent decrees with the State of Arizona. As part of the Company's August 4, 1999 recapitalization (the "Recapitalization"), Motorola retained responsibility for this contamination, and Motorola and Freescale have agreed to indemnify the Company with respect to remediation costs and other costs or liabilities related to this matter.
	As part of the Recapitalization, the Company received various manufacturing facilities, one of which is located in the Czech Republic. In regards to this site, the Company has ongoing remediation projects to respond to releases of hazardous substances that occurred prior to the Recapitalization during the years that this facility was operated by government-owned entities. In each case, the remediation project consists primarily of monitoring groundwater wells located on-site and off-site with additional action plans developed to respond in the event activity levels are exceeded at each of the respective locations. The government of the Czech Republic has agreed to indemnify the Company and the respective subsidiaries, subject to specified limitations, for remediation costs associated with this historical contamination. Based upon the information available, total future remediation costs to the Company are not expected to be material.
	The Company’s design center in East Greenwich, Rhode Island is located on property that has localized soil contamination. In connection with the purchase of the facility, the Company entered into a Settlement Agreement and covenant not to sue with the State of Rhode Island. This agreement requires that remedial actions be undertaken and a quarterly groundwater monitoring program be initiated by the former owners of the property. Based on the information available, any costs to the Company in connection with this matter have not been, and are not expected to be, material.
	As a result of the acquisition of AMIS, the Company is a “primary responsible party” to an environmental remediation and cleanup at AMIS’s former corporate headquarters in Santa Clara, California. Costs incurred by AMIS have included 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. Based on the information available, any costs to the Company in connection with this matter have not been, and are not expected to be, material.
	The Company's former manufacturing location in Aizu, Japan is located on property where soil and ground water contamination have been detected.  The Company believes that the contamination originally occurred during a time when the facility was operated by a prior owner.  The Company has worked with local authorities to implement a remediation plan and expects remaining remediation costs to be covered by insurance. Based on information available, any costs to the Company in connection with this matter have not been, and are not expected to be, material.
	Financing Contingencies
	In the normal course of business, the Company provides standby letters of credit or other guarantee instruments to certain parties initiated by either the Company or its subsidiaries, as required for transactions such as, but not limited to, purchase commitments, agreements to mitigate collection risk, leases, utilities or customs guarantees. The Company's senior revolving credit facility includes $40.0 million of availability for the issuance of letters of credit. A $0.2 million letter of credit was outstanding under the senior revolving credit facility as of December 31, 2013. The Company also had outstanding guarantees and letters of credit outside of its senior revolving credit facility totaling $5.8 million as of December 31, 2013.
	As part of securing financing in the normal course of business, the Company issued guarantees related to its receivables financing, certain capital lease obligations, equipment financing, lines of credit and real estate mortgages, which totaled approximately $77.1 million as of December 31, 2013. The Company is also a guarantor of SCI LLC's unsecured loan with SMBC, which had a balance of $273.7 million as of December 31, 2013. See Note 8: "Long-Term Debt" for further information with respect to the Company's loan with SMBC.
	Based on historical experience and information currently available, the Company believes that in the foreseeable future it will not be required to make payments under the standby letters of credit or guarantee arrangements.
	Indemnification Contingencies
	The Company is a party to a variety of agreements entered into in the ordinary course of business pursuant to which it may be obligated to indemnify the other parties for certain liabilities that arise out of or relate to the subject matter of the agreements. Some of the agreements entered into by the Company require it to indemnify the other party against losses due to 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 agreements, certificates of incorporation, by-laws, articles of association or similar organizational documents, as the case may be. The Company maintains directors’ and officers’ insurance, which should enable it to recover a portion of any future amounts paid.
	In addition to the above, from time to time the Company provides standard representations and warranties to counterparties in contracts in connection with sales of its securities and the engagement of financial advisers and also provides indemnities that protect the counterparties to these contracts in the event they suffer damages as a result of a breach of such representations and warranties or in certain other circumstances relating to the sale of securities or their engagement by the Company.
	While the Company’s future obligations under certain agreements may contain limitations on liability for indemnification, other agreements do not contain such limitations and under such agreements it is not possible to predict the maximum potential amount of future payments due to the conditional nature of the Company’s obligations and the unique facts and circumstances involved in each particular agreement. Historically, payments made by the Company under any of these indemnities have not had a material effect on the Company’s business, financial condition, results of operations or cash flows. Additionally, the Company does not believe that any amounts that it may be required to pay under these indemnities in the future will be material to the Company’s business, financial position, results of operations or cash flows.
	Legal Matters
	The Company is currently involved in a variety of legal matters that arise in the normal course of business. Based on information currently available, management does not believe that the ultimate resolution of these matters, including the matters described or referred to in the previous paragraphs will have a material effect on the Company's financial condition, results of operations or cash flows. However, because of the nature and inherent uncertainties of litigation, should the outcome of these actions be unfavorable, the Company's business, consolidated financial position, results of operations or cash flows could be materially and adversely affected.

Fair_Value_Measurements

Fair Value Measurements	12 Months Ended
	Dec. 31, 2013
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]	'
Fair Value Measurements	'
	Fair Value Measurements
	Fair Value of Financial Instruments
	The following table summarizes the Company's financial assets and liabilities measured at fair value on a recurring basis as of December 31, 2013 and December 31, 2012 (in millions):
	Description		Balance as of December 31, 2013			Quoted Prices in			Balance as of December 31, 2012			Quoted Prices in
						Active Markets (Level 1)						Active Markets (Level 1)
	Assets:
	Cash and cash equivalents:
	Demand and time deposits		$	447.5		$	447.5		$	385.9		$	385.9
	Money market funds		62			62			—			—
	Treasury securities		—			—			100.7			100.7
	Corporate bonds		—			—			0.3			0.3
	Other Current Assets:
	Foreign currency exchange contracts		$	—		$	—		$	3.2		$	3.2
	Liabilities:
	Foreign currency exchange contracts		$	0.1		$	0.1		$	—		$	—
	Short-term investments have an original maturity to the Company between three months and one year, are classified as held-to-maturity and are carried at amortized cost as the Company has the intent to hold these securities until maturity. Short-term investments classified as held-to-maturity as of the years ended December 31, 2013 and 2012, respectively, were as follows (in millions):
			Balance at December 31, 2013									Balance at December 31, 2012
			Carried at Amortized Cost			Unrealized Gain/(Loss)			Fair Value			Carried at Amortized Cost		Unrealized Gain/(Loss)			Fair Value
	Short-term investments-held-to-maturity:
	Commercial paper		$	15.5		$	—		$	15.5		$	25.5	$	—		$	25.5
	Corporate bonds		93.7			—			93.7			119.3		(0.1		)	119.2
	Government agencies		7			—			7			—		—			—
			$	116.2		$	—		$	116.2		$	144.8	$	(0.1	)	$	144.7
	The Company’s financial assets are valued using market prices on active markets (Level 1). The Company's short-term investments balance of $116.2 million as of December 31, 2013 is classified as held-to-maturity and is carried at amortized cost. There were no unrealized gains or losses on these short-term investments as of December 31, 2013.
	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) at December 31, 2013 and December 31, 2012 are as follows (in millions):
		December 31, 2013						December 31, 2012
		Carrying Amount			Fair Value			Carrying			Fair Value
								Amount
	Long-term debt, including current portion
	Convertible Notes	$	335.2		$	392.6		$	473.1		$	530.9
	Long-term debt	$	510.2		$	511.4		$	403.9		$	380.6
	The fair value of the Company's Convertible Notes was estimated based on market prices on 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 December 31, 2013 and December 31, 2012.
	Fair Values Measured on a Non-Recurring Basis
	Our non-financial assets, such as property, plant and equipment, goodwill and intangible assets are recorded at fair value upon acquisition and are remeasured at fair value only if an impairment charge is recognized. The Company uses unobservable inputs to the valuation methodologies that were significant to the fair value measurements, and the valuations required management judgment due to the absence of quoted market prices. We determine the fair value of our held and used assets, goodwill and intangible assets using an income, cost or market approach as determined reasonable. See Note 5: "Goodwill and Intangible Assets" for a discussion of certain assets impairments.
	The following table shows the fair value of certain of the Company's non-financial assets included in its Consolidated Balance Sheet as of December 31, 2013 and December 31, 2012 that were remeasured at fair value on a nonrecurring basis (in millions):
			Fair Value
			31-Dec-13			31-Dec-12
	Nonrecurring fair value measurements
	Property, plant and equipment (Level 3)		$	8.7		$	134.1
	Intangible assets (Level 3)		—			8.2
			$	8.7		$	142.3
	The following table shows the adjustments to fair value of certain of the Company's non-financial assets that had an impact on the Company's results of operations during the years ended December 31, 2013 and December 31, 2012 (in millions):
			Year Ended
			31-Dec-13			31-Dec-12
	Nonrecurring fair value measurements
	Impairment of property, plant and equipment held for use or disposal (Level 3)		$	8		$	103
	Goodwill impairment (Level 3)		—			14.1
	Intangible asset impairments (level 3)		—			35.4
			$	8		$	152.5
	During the fourth quarter of 2012, the Company evaluated the recoverability of the long-lived assets of the System Solutions Group due to the continued declines in revenue and operating performance. The Company revised its long-term projections related to its System Solutions Group, including material additional cost reduction efforts and a lower revenue base than previously assumed. As a result, the Company recorded an impairment charge of $126.0 million which was comprised of a $94.4 million charge to reduce the carrying value of the associated fixed assets and a $31.6 million charge to reduce the carrying value of the associated intangible assets to their respective fair values. Additionally, the Company recognized a goodwill impairment charge of $14.1 million relating to one of its reporting units during the year ended December 31, 2012. See Note 3: "Goodwill and Intangibles Assets" for additional information.

Financial_Instruments

Financial Instruments	12 Months Ended
	Dec. 31, 2013
Investments, All Other Investments [Abstract]	'
Financial Instruments	'
	Financial Instruments
	Foreign Currencies
	As a multinational business, the Company's transactions are denominated in a variety of currencies. When appropriate, the Company uses forward foreign currency contracts to reduce its overall exposure to the effects of currency fluctuations on its results of operations and cash flows. The Company's policy prohibits trading in currencies for which there are no underlying exposures, or entering into trades for any currency to intentionally increase the underlying exposure.
	The Company primarily hedges existing assets and liabilities associated with transactions currently on its balance sheet.
	At December 31, 2013 and 2012, the Company had net outstanding foreign exchange contracts with a net notional amounts of $101.7 million and $197.3 million, respectively. Such contracts were obtained through financial institutions and were scheduled to mature within one to three months. Management believes that these financial instruments should not subject the Company to increased risks from foreign exchange movements because gains and losses on these contracts should offset losses and gains on the underlying assets, liabilities and transactions to which they are related. The following schedule shows the Company's net foreign exchange positions in U.S. dollars as of December 31, 2013 and 2012 (in millions):
		December 31,
		2013 Buy (Sell)			2013 Notional Amount		2012 Buy (Sell)			2012 Notional Amount
	Euro	$	(30.5	)	$	30.5	$	(17.4	)	$	17.4
	Japanese Yen	(6.7		)	6.7		(123.3		)	123.3
	Malaysian Ringgit	35.8			35.8		32.7			32.7
	Philippine Peso	11.7			11.7		4.2			4.2
	Other currencies	10.6			17		(1.5		)	19.7
		$	20.9		$	101.7	$	(105.3	)	$	197.3
	The Company is exposed to credit-related losses if counterparties to its foreign exchange contracts fail to perform their obligations. As of December 31, 2013, the counterparties to the Company's foreign exchange contracts are highly rated financial institutions and no credit-related losses are anticipated. Amounts receivable or payable under the contracts are included in other current assets or accrued expenses in the accompanying consolidated balance sheet. For the years ended December 31, 2013, 2012 and 2011, realized and unrealized foreign currency transaction gains totaled $5.5 million, $3.5 million and a loss $8.9 million, respectively.
	As of December 31, 2013 and December 31, 2012, the Company had balances for contracts not designated as hedging instruments of zero and $2.4 million, respectively, which were classified as other assets. As of December 31, 2013 and December 31, 2012, the Company had $0.1 million and zero liability balances, respectively, for these contracts classified as other liabilities.
	Cash Flow Hedges
	The Company is exposed to global market risks associated with fluctuations in interest rates and foreign currency exchange rates. The Company addresses these risks through controlled management that includes the use of derivative financial instruments to economically hedge or reduce these exposures. The Company does not enter into derivative financial instruments for trading or speculative purposes.
	The purpose of the Company's foreign currency hedging activities is to protect the Company from the risk that the eventual cash flows resulting from transactions in foreign currencies will be adversely affected by changes in exchange rates. The Company enters into forward contracts that are designated as foreign-currency cash flow hedges of selected forecasted payments denominated in currencies other than U.S. dollars. All the contracts mature within 12 months and upon maturity, the amount recorded in accumulated other comprehensive income is reclassified into earnings. The Company documents all relationships between designated hedging instruments and hedged items, as well as its risk management objective and strategy for undertaking hedge transactions.
	All derivatives are recognized on the balance sheet at their fair value and classified based on the instrument's maturity date. The total notional amount of outstanding derivatives designated as cash flow hedges as of December 31, 2013 was approximately $42.9 million, which is primarily comprised of cash flow hedges for Malaysian Ringgit/U.S. Dollar and Philippine Peso/U.S. Dollar currency pairs.
	For the year ended December 31, 2013, the Company recorded a loss of $2.6 million in other comprehensive income associated with the Company's cash flow hedges. As of December 31, 2013, the Company had a $1.8 million liability balance for contracts designated as cash flow hedging instruments which were classified as other liabilities. For the year ended December 31, 2012, the Company had no liability balances for contracts designated as cash flow hedges. As of December 31, 2013 and 2012, the Company had asset balances for contracts designated as cash flow hedging instruments of zero and $0.8 million, respectively, which were classified as other assets.
	Other
	At December 31, 2013, 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.

Income_Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2013
Income Tax Disclosure [Abstract]	'
Income Taxes	'
	Income Taxes
	The Company's geographic sources of income (loss) before income taxes and non-controlling interest are as follows (in millions):
		Year ended December 31,
		2013				2012				2011
	United States	$	(76.8	)		$	(72.0	)		$	(143.9	)
	Foreign	257.7				(0.9		)		181.7
		$	180.9			$	(72.9	)		$	37.8
	The Company's provision for income taxes is as follows (in millions):
		Year ended December 31,
		2013				2012				2011
	Current:
	Federal	$	(0.4	)		$	0.2			$	0.5
	State and local	0.3				(0.1		)		0.3
	Foreign	15.9				16.4				25
		15.8				16.5				25.8
	Deferred:
	Federal	13.2				—				—
	Foreign	(2.1		)		(3.1		)		(2.9		)
		11.1				(3.1		)		(2.9		)
		$	26.9			$	13.4			$	22.9
	A reconciliation of the U.S. federal statutory income tax rate to the Company's effective income tax rate is as follows:
			Year ended December 31,
			2013			2012			2011
	U.S. federal statutory rate		35		%	35		%	35		%
	Increase (decrease) resulting from:
	State and local taxes, net of federal tax benefit		0.2			0.1			0.7
	Foreign withholding taxes		—			(0.3	)		0.1
	Foreign rate differential		(38.5	)		10.4			(588.0	)
	Dividend income from foreign subsidiaries		10.6			(62.7	)		146.1
	Goodwill impairment		—			(6.8	)		—
	Gain on SANYO Semiconductor Transaction		—			—			(22.5	)
	Change in valuation allowance		8.2			(1.6	)		491.5
	Tax reserves		(0.9	)		(2.3	)		0.8
	Return to accrual		(0.1	)		12.3			—
	Other		0.4			(2.5	)		(3.1	)
			14.9		%	(18.4	)	%	60.6		%
	Included in the Company's results for the fourth quarter of the year ended December 31, 2013, is the impact of a prior period error of approximately $10.7 million related to the Company's conclusion that certain deferred tax liabilities may not be netted against deferred tax assets prior to determining the required valuation allowance. The error was first corrected by separating the indefinite deferred tax liability from net deferred tax assets by recording a $10.7 million increase in long-term deferred tax assets and a corresponding increase in long-term deferred tax liabilities (included within Other Long-Term Liabilities) on the Company's Consolidated Balance Sheet as of December 31, 2013. The increase in deferred tax assets caused an increase in the valuation allowance of $10.7 million and a corresponding increase in the provision for income taxes on the Company's Consolidated Statement of Operations and Comprehensive Income for the year then ended. The Company believes that this error is not material to the consolidated financial statements of any prior interim or annual periods and that the correction of the error is not material to the Company's 2013 consolidated financial statements.
	The tax effects of temporary differences in the recognition of income and expense for tax and financial reporting purposes that give rise to significant portions of the deferred tax assets, net of deferred tax liabilities as of December 31, 2013 and December 31, 2012, are as follows (in millions):
			Year ended December 31,
			2013				2012
	Net operating loss and tax credit carryforwards		$	1,023.90			$	952
	Tax-deductible goodwill and amortizable intangibles		(7.7		)		18.2
	Reserves and accruals		82.5				98.8
	Property, plant and equipment		81.4				147.2
	Inventories		28.1				83.8
	Other		105.2				116
	Deferred tax assets and liabilities before valuation allowance		1,313.40				1,416.00
	Valuation allowance		(1,327.2		)		(1,420.1		)
	Net deferred tax asset (liability)		$	(13.8	)		$	(4.1	)
	A valuation allowance has been recorded against the Company's deferred tax assets, with the exception of deferred tax assets at certain foreign subsidiaries, as management cannot conclude that it is more likely than not that these assets will be realized. As of December 31, 2013,  the Company's deferred tax assets do not include $194.0 million of excess tax deductions from employee stock option exercises that are part of net operating loss carryforwards, which, if realized, will be accounted for as an addition to equity.
	As of December 31, 2013, the Company's federal, state, and foreign net operating loss carryforwards ("NOLs") were $1,043.7 million, $1,110.5 million, and $1,718.9 million, respectively. If not utilized, these NOLs will expire in varying amounts from 2014 through 2033. Pursuant to Sections 382 and 383 of the Internal Revenue Code, the utilization of NOLs and other tax attributes may be subject to substantial limitations if certain ownership changes occur during a three-year testing period (as defined by the Internal Revenue Code). During 2006, such an ownership change occurred, limiting the use of federal NOLs to approximately $93.1 million per year.
	The 2013 provision of $26.9 million included $22.2 million for income and withholding taxes of certain of the Company's foreign operations, $0.9 million of interest on existing reserves for potential liabilities in foreign taxing jurisdictions and $13.2 million of deferred federal income taxes associated with tax deductible goodwill. This is partially offset by the reversal of $6.0 million of valuation allowances against deferred tax assets of certain foreign subsidiaries and the reversal of $3.4 million for reserves and interest for potential liabilities in foreign taxing jurisdictions which were effectively settled or for which the statute lapsed during 2013.
	The 2012 provision of $13.4 million included $21.7 million for income and withholding taxes of certain of the Company's foreign operations and $0.9 million of interest on existing reserves for potential liabilities in foreign taxing jurisdictions. This is partially offset by $7.8 million of additional tax benefit recorded and the reversal of $1.4 million for reserves and interest for potential liabilities in foreign taxing jurisdictions which were effectively settled or for which the statute lapsed during 2012.
	The 2011 provision of $22.9 million included $19.4 million for income and withholding taxes of certain of the Company's foreign operations, $3.2 million of additional valuation allowance against certain deferred tax assets and $2.9 million of interest on existing reserves for potential liabilities in foreign taxing jurisdictions. This was partially offset by the reversal of $2.6 million for reserves and interest for potential liabilities in foreign taxing jurisdiction, which were effectively settled, or for which the statute lapsed during 2011.
	Income taxes have not been provided on approximately $1,378.5 million of the undistributed earnings of our foreign subsidiaries over which the Company has sufficient influence to control the distribution at December 31, 2013. The Company has determined that substantially all such earnings have been reinvested indefinitely. These earnings could become subject to either or both federal income tax and foreign withholding tax if they are remitted as dividends, if foreign earnings are loaned to any of our domestic companies, or if the Company sells its investment in certain subsidiaries. The Company estimates that repatriation of these foreign earnings would generate additional foreign withholding taxes of approximately $10.3 million, U.S. federal income taxes of approximately $31.9 million and state income taxes of approximately $3.0 million, each after net operating loss carryforwards and foreign tax credits.
	The Company or one of its subsidiaries files income tax returns in the U.S. federal jurisdiction, and various state and foreign jurisdictions. With few exceptions, the Company is no longer subject to U.S. federal, state and local, or non-U.S. income tax examinations by tax authorities for years before 2010.
	The Company maintains liabilities for uncertain tax positions. These liabilities involve considerable judgment and estimation and are continuously monitored by management based on the best information available, including changes in tax regulations, the outcome of relevant court cases, and other information. The Company is currently under examination by various taxing authorities. Although the outcome of any tax audit is uncertain, the Company believes that it has adequately provided in its consolidated financial statements for any additional taxes that the Company may be required to pay as a result of such examinations. If the payment ultimately proves not to be necessary, the reversal of these tax liabilities would result in tax benefits being recognized in the period the Company determines such liabilities are no longer necessary. However, if an ultimate tax assessment exceeds the Company's estimate of tax liabilities, additional tax expense will be recorded. The impact of such adjustments could have a material impact on the Company's results of operations in future periods.
	The activity for unrecognized gross tax benefits for 2013, 2012, and 2011 (in millions) is as follows:
		2013				2012				2011
	Balance at beginning of year	$	34.8			$	18.6			$	13.4
	Reserves acquired	—				—				1.3
	Additions based on tax positions related to the current year	0.7				18.4				5.5
	Additions for tax positions of prior years	—				—				0.8
Reductions for tax positions of prior years	(10.9		)		(0.8		)		(1.4		)
Lapse of statute	(3.7		)		(1.2		)		(1.0		)
Settlements	—				(0.2		)		—
Balance at end of year	$	20.9			$	34.8			$	18.6
Included in the December 31, 2013 balance of $20.9 million is $13.7 million related to unrecognized tax positions that, if recognized, would affect the annual effective tax rate. Of the total $20.9 million balance of unrecognized tax benefit at December 31, 2013, $1.7 million is related to tax positions for which it is reasonably possible that the total amounts could significantly change during the 12 months following December 31, 2013, as a result of expiring statutes of limitations.
The Company recognizes interest and penalties accrued in relation to unrecognized tax benefits in tax expense. The Company recognized approximately $0.5 million of expenses during the year ended December 31, 2013, and recognized approximately $0.2 million of expenses, and $0.1 million in benefits during the years ended December 31, 2012 and 2011, respectively. The Company had approximately $3.6 million, $3.0 million, and $2.9 million of accrued interest and penalties at December 31, 2013, 2012, and 2011, respectively.

Changes_in_Accumulated_Other_C

Changes in Accumulated Other Comprehensive Loss	12 Months Ended
	Dec. 31, 2013
Equity [Abstract]	'
Changes in Accumulated Other Comprehensive Loss	'
	Changes in Accumulated Other Comprehensive Loss
	Amounts comprising the Company's accumulated other comprehensive loss and reclassifications for the year ended December 31, 2013 are as follows (net of tax of $0, in millions):
		Foreign Currency Translation Adjustments			Defined Benefit Pension Items			Effects of Cash Flow Hedges			Unrealized Gains and Losses on Available-for-Sale Securities		Total
	Balance as of December 31, 2012	$	(42.2	)	$	(0.1	)	$	0.8		$	0.4	$	(41.1	)
	Other comprehensive income (loss) prior to reclassifications	17.2			0.1			(0.1		)	—		17.2
	Amounts reclassified from accumulated other comprehensive loss	(21.0		)	—			(2.5		)	—		(23.5		)
	Net current period other comprehensive loss	(3.8		)	0.1			(2.6		)	—		(6.3		)
	Balance as of December 31, 2013	$	(46.0	)	$	—		$	(1.8	)	$	0.4	$	(47.4	)
	Included in accumulated other comprehensive loss as of December 31, 2012 is approximately $21.0 million relating to cumulative foreign currency translation gains associated with the Company's subsidiary that owned its former Aizu facility, which utilized the Japanese Yen as its functional currency. As further described in Note 6: "Restructuring, Asset Impairments and Other, net," the Company closed its Aizu facility during the first quarter of 2013. The liquidation of the Company's subsidiary that owned its Aizu facility was substantially completed during the first quarter of 2013; therefore, the Company reclassified the associated cumulative foreign currency translation adjustments in its Consolidated Statements of Operations and Comprehensive Income.
	Amounts which were reclassified from accumulated other comprehensive loss to the Company's Consolidated Statements of Operations and Comprehensive Income during the year ended December 31, 2013 were as follows (net of tax of $0, in millions):
		Amounts Reclassified from Accumulated Other Comprehensive Loss			Affected Line Item Where Net Income is Presented
	Foreign currency translation adjustments	$	(21.0	)	Restructuring, asset impairments and other, net
	Effects of cash flow hedges	(2.5		)	Other income and expense
	Total reclassifications	$	(23.5	)

Supplemental_Disclosures

Supplemental Disclosures	12 Months Ended
	Dec. 31, 2013
Supplemental Cash Flow Elements [Abstract]	'
Supplemental Disclosures	'
	Supplemental Disclosures
	Supplemental Disclosure of Cash Flow Information
	The Company's non-cash financing activities and cash payments for interest and income taxes during the years ended December 31, 2013, 2012 and 2011 are as follows (in millions):
		Year ended December 31,
		2013			2012			2011
	Non-cash financing activities:
	Capital expenditures in accounts payable	$	55.8		$	54.4		$	58.8
	Equipment acquired or refinanced through capital leases	3.8			31			24.9
	Cash (received) paid for:
	Interest income	$	(1.3	)	$	(1.5	)	$	(1.1	)
	Interest expense	24.8			30.4			31.8
	Income taxes	12.9			17.6			20.4
	Supplemental Disclosure of Insurance Recoveries
	Business Interruption
	During the year ended December 31, 2013, the Company recognized income of approximately $13.5 million pursuant to a business interruption insurance claim associated with damages caused by the 2011 Thailand flood. The Company has recorded these proceeds as a reduction to cost of revenues in its Consolidated Statements of Operations and Comprehensive Income.
	During the year ended December 31, 2012, the Company recognized income from business interruption insurance proceeds of approximately $16.4 million associated with the 2011 Japan earthquake. The Company has recorded these proceeds as a reduction to cost of revenues in its Consolidated Statements of Operations and Comprehensive Income.
	Other Insurance Recoveries
	During the years ended December 31, 2012 and December 31, 2011, the Company received proceeds from insurance recoveries on property, plant and equipment of approximately $11.5 million and $13.3 million, respectively, associated with the 2011 Thailand flood and 2011 Japan earthquake. The Company has recorded these proceeds as a reduction to cost of revenues in its Consolidated Statements of Operations and Comprehensive Income. During the year ended December 31, 2011, the Company recognized income from insurance proceeds of approximately $23.9 million which were not related to insurance recoveries on property, plant and equipment.

Segment_Information

Segment Information	12 Months Ended
	Dec. 31, 2013
Segment Reporting, Measurement Disclosures [Abstract]	'
Segment Information	'
	Segment Information
	As of December 31, 2013, the Company was organized into three operating segments, which also represent its three reporting segments: Application Products Group, Standard Products Group and System Solutions Group. Each of the Company's major product lines has been examined and each product line has been assigned to a segment, as illustrated in the table below, based on the Company's operating strategy. Because many products are sold into different end-markets, the total revenue reported for a segment is not indicative of actual sales in the end-market associated with that segment, but rather is the sum of the revenue from the product lines assigned to that segment. These segments represent the Company's view of the business and as such are used to evaluate progress of major initiatives and allocation of resources.
	Application Products Group		Standard Products Group		System Solutions Group
	Automotive ASSPs		Bipolar Power		Power MOSFETs
	Analog Automotive		Thyristor		IGBTs
	Automotive Power Switching		Small Signal		Power and Signal Discretes
	Automotive Mixed-Signal solutions		Zener		Intelligent Power Modules
	Medical ASICs & ASSPs		Protection		Motor Driver ICs
	Linear Light Sensors		Rectifier		Display Drivers
	CMOS Image Sensors		Filters		ASICs
	Mixed Signal ASICs		MOSFETs		Microcontrollers
	Industrial ASSPs		Signal & Interface		Flash Memory
	High Frequency / Timing		Standard Logic		Touch Sensor
	IPDs		LDO's & VREGs		Power Supply IC
	Foundry and Manufacturing Services		EE Memory and Programmable Analog		Audio DSP
	Hearing Components		IGBTs		Audio Tuners
	DC-DC Conversion				Image Stabilizer ICs
	Analog Switches				Auto Focus ICs
	AC-DC Conversion
	Low Voltage Power Management
	Power Switching
	RF Antenna Tuning Solutions
	The accounting policies of the segments are the same as those described in the summary of significant accounting policies. The Company evaluates performance based on income or loss from operations before interest, nonrecurring gains and losses, foreign exchange gains and losses, income taxes, restructuring, asset impairments and other, net, goodwill impairment and certain other unallocated manufacturing and operating expenses.
	The Company's wafer manufacturing facilities fabricate ICs for all business units as necessary and their operating costs are reflected in the segments' cost of revenues on the basis of product costs. Because operating segments are generally defined by the products they design and sell, they do not make sales to each other. The Company does not discretely allocate assets to its operating segments, nor does management evaluate operating segments using discrete asset information.
	In addition to the operating and reporting segments mentioned above, the Company also operates global operations, sales and marketing, information systems, finance and administration groups that are led by vice presidents who report to the Chief Executive Officer. A portion of the expenses of these groups are allocated to the segments based on specific and general criteria and are included in the operating results reported below. The Company does not allocate income taxes or interest expense to its operating segments as the operating segments are principally evaluated on operating profit before interest and taxes. Additionally, restructuring, asset impairments and other, net and certain other manufacturing and operating expenses, which include corporate research and development costs, unallocated inventory reserves and miscellaneous nonrecurring expenses, are not allocated to any segment.
	Revenues, gross profit and operating income for the Company’s reportable segments for the years ended December 31, 2013, December 31, 2012 and December 31, 2011, respectively, are as follows (in millions):
			Application Products Group				Standard			System Solutions Group			Total
							Products
							Group
	For year ended December 31, 2013:
	Revenues from external customers		$	1,036.30			$	1,121.20		$	625.2		$	2,782.70
	Segment gross profit		455.6				390.7			103.4			949.7
	Segment operating income (loss)		110.6				228.2			(66.3		)	272.5
	For year ended December 31, 2012:
	Revenues from external customers		$	1,019.20			$	1,104.70		$	771		$	2,894.90
	Segment gross profit		459.2				400.9			143.1			1,003.20
	Segment operating income (loss)		111.2				240			(91.8		)	259.4
	For year ended December 31, 2011:
	Revenues from external customers		$	1,145.50			$	1,236.50		$	1,060.30		$	3,442.30
	Segment gross profit		549				435.7			79.1			1,063.80
	Segment operating income (loss)		190.8				254.6			(159.4		)	286
	Depreciation and amortization expense is included in segment operating income. Reconciliations of segment gross profit and segment operating income to the financial statements are as follows (in millions):
		Year Ended
		December 31, 2013				December 31, 2012			December 31, 2011
	Gross profit for reportable segments	$	949.7			$	1,003.20		$	1,063.80
	Unallocated amounts:
	Other unallocated manufacturing costs	(11.3		)		(51.3		)	(55.0		)
	Gross profit	$	938.4			$	951.9		$	1,008.80
	Operating income for reportable segments	$	272.5			$	259.4		$	286
	Unallocated amounts:
	Restructuring and other charges	(33.2		)		(165.3		)	(102.7		)
	Goodwill and intangible impairment	—				(49.5		)	—
	Other unallocated manufacturing costs	(11.3		)		(51.3		)	(55.0		)
	Other unallocated operating expenses	(9.8		)		(9.6		)	(14.9		)
	Operating income (loss)	$	218.2			$	(16.3	)	$	113.4
	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. See Note 7: "Balance Sheet Information" for additional information.
	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.
	Revenues by geographic location including local sales made by operations within each area, based on sales billed from the respective country, are summarized as follows (in millions):
		Year Ended
		December 31, 2013				December 31, 2012			December 31, 2011
	United States	$	415.4			$	452		$	524
	United Kingdom	400.2				388.3			424.7
	China	862.4				874.2			1,053.80
Japan	290.2				401.2			494.8
Singapore	700.6				627.7			683.3
Other	113.9				151.5			261.7
	$	2,782.70			$	2,894.90		$	3,442.30
Property, plant and equipment, net by geographic location, are summarized as follows (in millions):
	December 31,				December 31,			December 31,
	2013				2012			2011
United States	$	255.3			$	274.7		$	257.5
Czech Republic	111.1				118			91.6
Malaysia	213.9				185			164.5
Philippines	173.8				188.8			204
Japan	61.3				78.9			130.2
Other	258.8				257.9			261.7
	$	1,074.20			$	1,103.30		$	1,109.50
For the years ended December 31, 2013, December 31, 2012, and December 31, 2011, there were no individual customers, including distributors, which accounted for more than 10% of the Company’s total consolidated revenues.

Supplementary_Financial_Inform

Supplementary Financial Information - Selected Quarterly Financial Data (Unaudited)	12 Months Ended
	Dec. 31, 2013
Quarterly Financial Information Disclosure [Abstract]	'
Supplementary Financial Information - Selected Quarterly Financial Data (Unaudited)	'
	Supplementary Financial Information - Selected Quarterly Financial Data (Unaudited)
	Consolidated quarterly financial information for 2013 and 2012 follows (in millions, except per share data):
		Quarter ended 2013
		29-Mar		28-Jun		27-Sep		31-Dec
	Revenues	$	661	$	688.3	$	715.4	$	718
	Gross Profit	204.5		231.8		249.2		252.9
	Net income attributable to ON Semiconductor Corporation (1)	22.6		47.7		51.8		28.7
	Diluted net income per common share attributable to ON Semiconductor Corporation	0.05		0.11		0.11		0.06
		Quarter ended 2012
		30-Mar		29-Jun		28-Sep		31-Dec
	Revenues	$	744.4	$	744.8	$	725.5	$	680.2
	Gross Profit	245.2		258.3		238		210.4
	Net income (loss) attributable to ON Semiconductor Corporation	28.2		6.9		12.5		(138.2		)
	Diluted net income (loss) per common share attributable to ON Semiconductor Corporation	0.06		0.02		0.03		(0.31		)
	(1) Net income (loss) attributable to ON Semiconductor Corporation for the quarters ended December 31, 2013 and December 31, 2012 includes Restructuring, Asset Impairment and Other, net charges of $22.1 million and $108.0 million respectively. See Note 6: "Restructuring, Asset Impairments and Other, net" and Note 13: "Fair Value Measurements" for additional information.

Guarantor_And_NonGuarantor_Sta

Guarantor And Non-Guarantor Statements	12 Months Ended
	Dec. 31, 2013
Guarantor And Non-Guarantor Statements [Abstract]	'
Guarantor And Non-Guarantor Statements	'
	Guarantor and Non-Guarantor Statements
	ON Semiconductor is the sole issuer of the Convertible Notes. ON Semiconductor’s 100% owned domestic subsidiaries, except those domestic subsidiaries acquired through the acquisitions of AMIS, Catalyst, PulseCore, CMD, SDT, and SANYO Semiconductor (collectively, the “Guarantor Subsidiaries”), fully and unconditionally guarantee, subject to customary releases, on a joint and several basis ON Semiconductor’s obligations under the Convertible Notes. The Guarantor Subsidiaries include SCI LLC, Semiconductor Components Industries of Rhode Island, Inc., as well as other holding companies whose net assets consist primarily of investments in the joint venture in Leshan, China and equity interests in the Company’s other foreign subsidiaries. ON Semiconductor’s other remaining subsidiaries (collectively, the “Non-Guarantor Subsidiaries”) are not guarantors of the Convertible Notes. The repayment of the unsecured Convertible Notes is subordinated to the senior indebtedness of ON Semiconductor and the Guarantor Subsidiaries on the terms described in the indentures for such Convertible Notes.
	Condensed consolidating financial information for the issuer of the Convertible Notes, the Guarantor Subsidiaries and the Non-Guarantor Subsidiaries is as follows (in millions):
	CONDENSED CONSOLIDATING BALANCE SHEET
	AS OF DECEMBER 31, 2013
	(in millions)
		Issuer			Guarantor
		ON Semiconductor			SCI LLC			Other			Non-Guarantor			Eliminations			Total
		Corporation						Subsidiaries			Subsidiaries
	Cash and cash equivalents	$	—		$	267.9		$	—		$	241.6		$	—		$	509.5
	Short-term investments	—			116.2			—			—			—			116.2
	Receivables, net	—			49.8			—			333.6			—			383.4
	Inventories	—			46.7			—			562.1			3			611.8
	Short-term intercompany receivables	—			—			4.1			7.6			(11.7		)	—
	Other current assets	—			17.8			—			71.5			—			89.3
	Total current assets	—			498.4			4.1			1,216.40			(8.7		)	1,710.20
	Property, plant and equipment, net	—			252.3			3.1			820.6			(1.8		)	1,074.20
	Goodwill	—			111.5			37.3			35.8			—			184.6
	Intangible assets, net	—			113			—			132.2			(21.8		)	223.4
	Long-term intercompany receivables	—			—			—			3.3			(3.3		)	—
	Other assets	1,790.20			1,600.60			136.1			837.3			(4,299.6		)	64.6
	Total assets	$	1,790.20		$	2,575.80		$	180.6		$	3,045.60		$	(4,335.2	)	$	3,257.00
	Accounts payable	$	—		$	39.1		$	0.5		$	237.2		$	—		$	276.8
	Accrued expenses	1			50.8			0.2			168.3			—			220.3
	Deferred income on sales to distributors	—			32.3			—			108.2			—			140.5
	Current portion of long-term debt	—			79.3			—			102.3			—			181.6
	Short-term intercompany payables	—			11.7			—			—			(11.7		)	—
	Total current liabilities	1			213.2			0.7			616			(11.7		)	819.2
	Long-term debt	335.2			396.1			—			29.3			—			760.6
	Other long-term liabilities	—			42.2			0.1			148.1			—			190.4
	Long-term intercompany payables	—			3.3			—			—			(3.3		)	—
	Total liabilities	336.2			654.8			0.8			793.4			(15.0		)	1,770.20
	Common stock	5.2			0.3			50.9			201.6			(252.8		)	5.2
	Additional paid-in capital	3,210.80			2,335.10			259.8			1,402.60			(3,997.5		)	3,210.80
	Accumulated other comprehensive loss	(47.4		)	(49.2		)	—			(38.6		)	87.8			(47.4		)
	Accumulated deficit	(1,142.1		)	(365.2		)	(130.9		)	686.6			(190.5		)	(1,142.1		)
	Less: treasury stock, at cost	(572.5		)	—			—			—			—			(572.5		)
	Total ON Semiconductor Corporation stockholders’ equity	1,454.00			1,921.00			179.8			2,252.20			(4,353.0		)	1,454.00
	Non-controlling interest in consolidated subsidiary	—			—			—			—			32.8			32.8
	Total equity	1,454.00			1,921.00			179.8			2,252.20			(4,320.2		)	1,486.80
	Total liabilities and equity	$	1,790.20		$	2,575.80		$	180.6		$	3,045.60		$	(4,335.2	)	$	3,257.00
	CONDENSED CONSOLIDATING BALANCE SHEET
	AS OF DECEMBER 31, 2012
	(in millions)
		Issuer			Guarantor
		ON Semiconductor			SCI LLC			Other			Non-Guarantor			Eliminations			Total
		Corporation						Subsidiaries			Subsidiaries
	Cash and cash equivalents	$	—		$	212.1		$	—		$	274.8		$	—		$	486.9
	Short-term investments	—			144.8			—			—			—			144.8
	Receivables, net	—			45.4			—			312.4			—			357.8
	Inventories	—			34.5			—			578.4			(31.2		)	581.7
	Short-term intercompany receivables	—			—			3.3			17.2			(20.5		)	—
	Other current assets	—			12.9			—			109.3			—			122.2
	Total current assets	—			449.7			3.3			1,292.10			(51.7		)	1,693.40
	Property, plant and equipment, net	—			272			2.8			830.9			(2.4		)	1,103.30
	Goodwill	—			111.7			37.2			35.7			—			184.6
	Intangible assets, net	—			128.2			—			154.7			(25.9		)	257
	Long-term intercompany receivables	—			166.3			—			—			(166.3		)	—
	Other assets	1,834.60			1,431.50			129.5			846.2			(4,151.7		)	90.1
	Total assets	$	1,834.60		$	2,559.40		$	172.8		$	3,159.60		$	(4,398.0	)	$	3,328.40
	Accounts payable	$	—		$	24.1		$	—		$	255.4		$	—		$	279.5
	Accrued expenses	0.5			53			0.9			177.8			24.5			256.7
	Deferred income on sales to distributors	—			34.2			—			100.3			—			134.5
Current portion of long-term debt	198.9			80.2			0.1			74.4			—			353.6
Short-term intercompany payables	—			20.4			—			0.1			(20.5		)	—
Total current liabilities	199.4			211.9			1			608			4			1,024.30
Long-term debt	274.1			344.1			—			40.1			—			658.3
Other long-term liabilities	—			29.9			0.3			224.9			—			255.1
Long-term intercompany payables	—			—			—			166.3			(166.3		)	—
Total liabilities	473.5			585.9			1.3			1,039.30			(162.3		)	1,937.70
Common stock	5.1			0.3			50.9			201.6			(252.8		)	5.1
Additional paid-in capital	3,156.40			2,549.30			259.2			1,402.90			(4,211.4		)	3,156.40
Accumulated other comprehensive loss	(41.1		)	(41.0		)	—			(34.6		)	75.6			(41.1		)
Accumulated deficit	(1,292.9		)	(535.1		)	(138.6		)	550.4			123.3			(1,292.9		)
Less: treasury stock, at cost	(466.4		)	—			—			—			—			(466.4		)
Total ON Semiconductor Corporation stockholders’ equity	1,361.10			1,973.50			171.5			2,120.30			(4,265.3		)	1,361.10
Non-controlling interest in consolidated subsidiary	—			—			—			—			29.6			29.6
Total equity	1,361.10			1,973.50			171.5			2,120.30			(4,235.7		)	1,390.70
Total liabilities and equity	$	1,834.60		$	2,559.40		$	172.8		$	3,159.60		$	(4,398.0	)	$	3,328.40
CONDENSED CONSOLIDATING STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME
FOR THE YEAR ENDED DECEMBER 31, 2013
(in millions)
	Issuer			Guarantor
				Subsidiaries
	ON Semiconductor			SCI LLC			Other			Non-Guarantor			Eliminations			Total
	Corporation						Subsidiaries			Subsidiaries
Revenues	$	—		$	684.2		$	13.8		$	4,142.30		$	(2,057.6	)	$	2,782.70
Cost of revenues	—			516.4			0.6			3,419.10			(2,091.8		)	1,844.30
Gross profit	—			167.8			13.2			723.2			34.2			938.4
Operating expenses:
Research and development	—			77.2			10.9			246.1			—			334.2
Selling and marketing	—			71.4			0.7			99.1			—			171.2
General and administrative	—			32.6			0.8			115.1			—			148.5
Amortization of acquisition-related intangible assets	—			15.2			—			22.1			(4.2		)	33.1
Restructuring, asset impairments and other, net	—			1.2			—			32			—			33.2
Total operating expenses	—			197.6			12.4			514.4			(4.2		)	720.2
Operating income (loss)	—			(29.8		)	0.8			208.8			38.4			218.2
Other income (expenses), net:
Interest expense	(23.0		)	(10.5		)	—			(5.1		)	—			(38.6		)
Interest income	—			0.4			—			0.9			—			1.3
Other	—			(11.5		)	—			14.6			—			3.1
Loss on debt repurchase or exchange	(3.1		)	—			—			—			—			(3.1		)
Equity in earnings	176.9			232.6			7.4			—			(416.9		)	—
Other income (expenses), net	150.8			211			7.4			10.4			(416.9		)	(37.3		)
Income before income taxes	150.8			181.2			8.2			219.2			(378.5		)	180.9
Income tax provision	—			(11.4		)	—			(15.5		)	—			(26.9		)
Net income	150.8			169.8			8.2			203.7			(378.5		)	154
Net income attributable to non-controlling interest	—			—			—			—			(3.2		)	(3.2		)
Net income attributable to ON Semiconductor Corporation	$	150.8		$	169.8		$	8.2		$	203.7		$	(381.7	)	$	150.8
Comprehensive income attributed to ON Semiconductor Corporation	$	144.5		$	161.4		$	8.2		$	200.1		$	(369.7	)	$	144.5
CONDENSED CONSOLIDATING STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME
FOR THE YEAR ENDED DECEMBER 31, 2012
(in millions)
	Issuers			Guarantor
				Subsidiaries
	ON Semiconductor			SCI LLC			Other			Non-Guarantor			Eliminations			Total
	Corporation						Subsidiaries			Subsidiaries
Revenues	$	—		$	732.2		$	12.9		$	3,760.90		$	(1,611.1	)	$	2,894.90
Cost of revenues	—			468.1			0.6			3,052.30			(1,578.0		)	1,943.00
Gross profit	—			264.1			12.3			708.6			(33.1		)	951.9
Operating expenses:
Research and development	—			180.3			10.3			176.9			—			367.5
Selling and marketing	—			68.2			0.8			111.9			—			180.9
General and administrative	—			5			0.6			155			—			160.6
Amortization of acquisition related intangible assets	—			18.1			—			30.5			(4.2		)	44.4
Restructuring, asset impairments and other, net	—			3.3			0.1			161.9			—			165.3
Goodwill and intangible asset impairment	—			20.1			—			29.4			—			49.5
Total operating expenses	—			295			11.8			665.6			(4.2		)	968.2
Operating income (loss)	—			(30.9		)	0.5			43			(28.9		)	(16.3		)
Other income (expenses), net:
Interest expense	(38.0		)	(9.0		)	—			(9.1		)	—			(56.1		)
Interest income	—			0.8			—			0.7			—			1.5
Other	—			11.7			—			(5.9		)	—			5.8
Loss on debt repurchase or exchange	(7.8		)	—			—			—			—			(7.8		)
Equity in earnings	(44.8		)	(25.6		)	10			—			60.4			—
Other income (expenses), net	(90.6		)	(22.1		)	10			(14.3		)	60.4			(56.6		)
Income (loss) before income taxes	(90.6		)	(53.0		)	10.5			28.7			31.5			(72.9		)
Income tax provision	—			(1.8		)	—			(11.6		)	—			(13.4		)
Net income (loss)	(90.6		)	(54.8		)	10.5			17.1			31.5			(86.3		)
Net income attributable to non-controlling interest	—			—			—			—			(4.3		)	(4.3		)
Net income (loss) attributable to ON Semiconductor Corporation	$	(90.6	)	$	(54.8	)	$	10.5		$	17.1		$	27.2		$	(90.6	)
Comprehensive income (loss) attributed to ON Semiconductor Corporation	$	(85.0	)	$	(49.2	)	$	10.5		$	21.4		$	17.3		$	(85.0	)
CONDENSED CONSOLIDATING STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME
FOR THE YEAR ENDED DECEMBER 31, 2011
(in millions)
	Issuers			Guarantor
				Subsidiaries
	ON Semiconductor			SCI LLC			Other			Non-Guarantor			Eliminations			Total
	Corporation						Subsidiaries			Subsidiaries
Revenues	$	—		$	788.9		$	13.9		$	3,985.70		$	(1,346.2	)	$	3,442.30
Cost of revenues	—			531.5			0.8			3,236.40			(1,335.2		)	2,433.50
Gross profit	—			257.4			13.1			749.3			(11.0		)	1,008.80
Operating Expenses:
Research and development	—			167.6			10.7			184.2			—			362.5
Selling and marketing	—			70.4			1			123.7			—			195.1
General and administrative	—			84			0.7			107.7			—			192.4
Amortization of acquisition related intangible assets	—			18			—			28.8			(4.1		)	42.7
Restructuring, asset impairments and other, net	—			3.4			—			99.3			—			102.7
Total operating expenses	—			343.4			12.4			543.7			(4.1		)	895.4
Operating income (loss)	—			(86.0		)	0.7			205.6			(6.9		)	113.4
Other income (expenses), net:
Interest expense	(50.8		)	(8.5		)	—			(9.6		)	—			(68.9		)
Interest income	—			0.4			—			0.7			—			1.1
Other	—			(3.1		)	—			(5.8		)	—			(8.9		)
Loss on debt repurchase or exchange	(23.2		)	—			—			—			—			(23.2		)
Gain on System Solutions Semiconductor acquisition	(0.1		)	24.4			—			—			—			24.3
Equity in earnings	85.7			151.6			7.7			—			(245.0		)	—
Other income (expenses), net	11.6			164.8			7.7			(14.7		)	(245.0		)	(75.6		)
Income before income taxes	11.6			78.8			8.4			190.9			(251.9		)	37.8
Income tax benefit (provision)	—			1.5			—			(24.4		)	—			(22.9		)
Net income	11.6			80.3			8.4			166.5			(251.9		)	14.9
Net income attributable to non-controlling interest	—			—			—			—			(3.3		)	(3.3		)
Net income attributable to ON Semiconductor Corporation	$	11.6		$	80.3		$	8.4		$	166.5		$	(255.2	)	$	11.6
Comprehensive income attributable to ON Semiconductor Corporation	$	24		$	92.6		$	8.4		$	178.9		$	(279.9	)	$	24
CONDENSED CONSOLIDATING STATEMENT CASH FLOWS
FOR THE YEAR ENDED DECEMBER 31, 2013
(in millions)
	Issuer			Guarantor
				Subsidiaries
	ON Semiconductor			SCI LLC			Other			Non-Guarantor			Eliminations			Total
	Corporation						Subsidiaries			Subsidiaries
Net cash provided by operating activities	$	—		$	63.9		$	0.2		$	274.5		$	(11.3	)	$	327.3
Cash flows from investing activities:
Purchases of property, plant and equipment	—			(32.4		)	(0.2		)	(122.6		)	—			(155.2		)
Proceeds from sales of property, plant and equipment	—			0.1			—			9.6			—			9.7
Deposits made for purchases of property, plant and equipment	—			—			—			(1.3		)	—			(1.3		)
Proceeds from held-to maturity securities	—			224.3			—			—			—			224.3
Purchase of held-to-maturity securities	—			(195.7		)	—			—			—			(195.7		)
Contribution from subsidiaries	235.2			—			—			—			(235.2		)	—
Net cash provided by (used in) investing activities	235.2			(3.7		)	(0.2		)	(114.3		)	(235.2		)	(118.2		)
Cash flows from financing activities:
Intercompany loans	—			(812.0		)	—			812			—			—
Intercompany loan repayments to guarantor	—			981.7			—			(981.7		)	—			—
Payments to parent	—			(246.5		)	—			—			246.5			—
Proceeds from issuance of common stock under the employee stock purchase plan	8.3			—			—			—			—			8.3
Proceeds from exercise of stock options	12.1			—			—			—			—			12.1
Payments of tax withholding for restricted shares	(4.5		)	—			—			—			—			(4.5		)
Repurchase of common stock	(101.0		)	—			—			—			—			(101.0		)
Proceeds from debt issuance	—			120			—			53.7			—			173.7
Payment of capital leases obligations	—			(38.2		)	—			(3.5		)	—			(41.7		)
Repayment of long-term debt	(150.1		)	(6.2		)	—			(61.4		)	—			(217.7		)
Payments made in connection with debt refinancing	—			(3.2		)	—			—			—			(3.2		)
Net cash used in financing activities	(235.2		)	(4.4		)	—			(180.9		)	246.5			(174.0		)
Effect of exchange rate changes on cash and cash equivalents	—			—			—			(12.5		)	—			(12.5		)
Net increase (decrease) in cash and cash equivalents	—			55.8			—			(33.2		)	—			22.6
Cash and cash equivalents, beginning of period	—			212.1			—			274.8			—			486.9
Cash and cash equivalents, end of period	$	—		$	267.9		$	—		$	241.6		$	—		$	509.5
CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS
FOR THE YEAR ENDED DECEMBER 31, 2012
(in millions)
	Issuers			Guarantor
				Subsidiaries
	ON Semiconductor			SCI LLC			Other			Non-Guarantor			Eliminations			Total
	Corporation						Subsidiaries			Subsidiaries
Net cash provided by operating activities	$	—		$	45.5		$	0.9		$	242.7		$	(13.1	)	$	276
Cash flows from investing activities:
Purchases of property, plant and equipment	—			(55.0		)	(0.7		)	(200.6		)	—			(256.3		)
Proceeds from sale of property, plant and equipment	—			0.1			—			6.1			—			6.2
Deposits utilized for purchases of property, plant and equipment	—			—			—			1.4			—			1.4
Recovery from insurance on property, plant and equipment	—			—			—			11.5			—			11.5
Proceeds from held-to-maturity securities	—			377.6			—			—			—			377.6
Purchase of held-to-maturity securities	—			(273.8		)	—			—			—			(273.8		)
Contribution from subsidiaries	167.8			(7.9		)	—			—			(159.9		)	—
Net cash provided by (used in) investing activities	167.8			41			(0.7		)	(181.6		)	(159.9		)	(133.4		)
Cash flows from financing activities:
Intercompany loans	—			(524.0		)	—			524			—			—
Intercompany loan repayments	—			562			—			(562.0		)	—			—
Payments to parent	—			(180.9		)	—			7.9			173			—
Proceeds from issuance of common stock under the employee stock purchase plan	8.3			—			—			—			—			8.3
Proceeds from exercise of stock options	9.4			—			—			—			—			9.4
Payments of tax withholding for restricted shares	(9.6		)	—			—			—			—			(9.6		)
Repurchase of common stock	(55.5		)	—			—			—			—			(55.5		)
Proceeds from debt issuance	—			6.5			—			17.1			—			23.6
Payment of capital lease obligation	—			(37.4		)	—			(3.4		)	—			(40.8		)
Repayment of long-term debt	(117.8		)	(5.1		)	—			(109.6		)	—			(232.5		)
Payments made in connection with debt refinancing	(2.6		)	—			—			—			—			(2.6		)
Net cash used in financing activities	(167.8		)	(178.9		)	—			(126.0		)	173			(299.7		)
Effect of exchange rate changes on cash and cash equivalents	—			—			—			(8.9		)	—			(8.9		)
Net increase (decrease) in cash and cash equivalents	—			(92.4		)	0.2			(73.8		)	—			(166.0		)
Cash and cash equivalents, beginning of period	—			304.5			(0.2		)	348.6			—			652.9
Cash and cash equivalents, end of period	$	—		$	212.1		$	—		$	274.8		$	—		$	486.9
CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS
FOR THE YEAR ENDED DECEMBER 31, 2011
(in millions)
	Issuers			Guarantor
				Subsidiaries
	ON Semiconductor			SCI LLC			Other			Non-Guarantor			Eliminations			Total
	Corporation						Subsidiaries			Subsidiaries
Net cash provided by operating activities	$	—		$	0.4		$	—		$	558.9		$	(13.8	)	$	545.5
Cash flows from investing activities:
Purchases of property, plant and equipment	—			(69.0		)	(0.2		)	(247.2		)	—			(316.4		)
Proceeds from sales of property, plant and equipment	—			0.1			—			3.2			—			3.3
Deposits utilized for purchases of property, plant and equipment	—			—			—			0.5			—			0.5
Recovery from insurance on property, plant and equipment	—			—			—			13.3			—			13.3
Purchase of businesses, net of cash acquired	—			24.3			—			(42.2		)	—			(17.9		)
Proceeds from held-to maturity securities	—			122.2			—			—			—			122.2
Purchase of held-to-maturity securities	—			(370.8		)	—			—			—			(370.8		)
Change in restricted cash	—			142.1			—			—			—			142.1
Contribution from subsidiaries	23.9			234.5			—			—			(258.4		)	—
Net cash provided by (used in) investing activities	23.9			83.4			(0.2		)	(272.4		)	(258.4		)	(423.7		)
Cash flows from financing activities:
Intercompany loan activity	—			(289.3		)	—			289.3			—			—
Intercompany loan repayments to guarantor	—			182.2			—			(182.2		)	—			—
Payments to parent	—			(37.7		)	—			(234.5		)	272.2			—
Proceeds from issuance of common stock under the employee stock purchase plan	8.1			—			—			—			—			8.1
Proceeds from exercise of stock options	59.4			—			—			—			—			59.4
Payments of tax withholding for restricted shares	(19.3		)	—			—			—			—			(19.3		)
Proceeds from debt issuance	—			12.2			—			56.8			—			69
Payment of capital leases obligations	—			(36.4		)	—			(2.6		)	—			(39.0		)
Repayment of long-term debt	(56.2		)	(2.6		)	—			(100.7		)	—			(159.5		)
Payments made in connection with debt refinancing	(15.9		)	—			—			—			—			(15.9		)
Net cash used in financing activities	(23.9		)	(171.6		)	—			(173.9		)	272.2			(97.2		)
Effect of exchange rate changes on cash and cash equivalents	—			—			—			5			—			5
Net increase (decrease) in cash and cash equivalents	—			(87.8		)	(0.2		)	117.6			—			29.6
Cash and cash equivalents, beginning of period	—			392.3			—			231			—			623.3
Cash and cash equivalents, end of period	$	—		$	304.5		$	(0.2	)	$	348.6		$	—		$	652.9

Valuation_And_Qualifying_Accou

Valuation And Qualifying Accounts And Reserves	12 Months Ended
	Dec. 31, 2013
Valuation and Qualifying Accounts [Abstract]	'
Valuation And Qualifying Accounts And Reserves	'
	Description	Balance at Beginning of Period		Charged to Costs and Expenses			Charged to Other Accounts				Deductions/Write-offs				Balance at End of Period
	Allowance for doubtful accounts
	Year ended December 31, 2011	$	7.3	$	(0.2	)	$	—			$	—			$	7.1
	Year ended December 31, 2012	7.1		(1.9		)	—				(2.5		)		2.7
	Year ended December 31, 2013	2.7		—			—				(1.7		)		1
	Allowance for deferred tax assets
	Year ended December 31, 2011	$	560.8	$	170.1		$	895.2		-1	$	—			$	1,626.10
	Year ended December 31, 2012	1,626.10		(4.0		)	(92.2		)	-2	(109.8		)	-3	1,420.10
	Year ended December 31, 2013	1,420.10		74.9			(161.8		)	-2	(6.0		)		1,327.20
	(1) Represents a charge of $895.2 million to goodwill for deferred tax assets acquired from SANYO Semiconductor on January 1, 2011.
	(2) Represents the effects of cumulative translation adjustments.
	(3) Represents decreases to deferred tax assets, which have a full valuation allowance arising from the SANYO Semiconductor Transaction. Additional information related to these deferred tax assets became available in 2012.

Significant_Accounting_Policie1

Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2013
Accounting Policies [Abstract]	'
Principles of Consolidation	'
	Principles of Consolidation
	The accompanying consolidated financial statements include the accounts of the Company, including its wholly-owned and majority-owned subsidiaries. Investments in companies that represent less than 20% of the related voting stock where the Company does not have the ability to exert significant influence are accounted for on a cost basis. All material intercompany accounts and transactions have been eliminated.
Use of Estimates	'
	Use of Estimates
	The preparation of financial statements in accordance with generally accepted accounting principles in the United States of America requires management to make estimates and assumptions that affect the reported amount of assets and liabilities at the date of the financial statements and the reported amount of revenues and expenses during the reporting period. Significant estimates have been used by management in conjunction with the following: (i) measurement of valuation allowances relating to trade receivables, inventories and deferred tax assets; (ii) estimates of future payouts for customer incentives, warranties, and restructuring activities; (iii) assumptions surrounding future pension obligations; (iv) fair values of stock options and of financial instruments (including derivative financial instruments); (v) evaluations of uncertain tax positions; and (vi) future cash flows used to assess and test for impairment of long-lived assets and, if applicable, goodwill. Actual results could differ from these estimates.
Cash and cash equivalents	'
	Cash and cash equivalents
	The Company considers all highly liquid investments with an original maturity to the Company of three months or less to be cash equivalents. Cash and cash equivalents are maintained with reputable major financial institutions. If, due to current economic conditions, one or more of the financial institutions with which the Company maintains deposits fails, the Company's cash and cash equivalents may be at risk. Deposits with these banks generally exceed the amount of insurance provided on such deposits; however, these deposits typically may be redeemed upon demand and, therefore, bear minimal risk.
Short-Term Investments	'
	Short-Term Investments
	Short-term investments have an original maturity to the Company between three months and one year, and are classified as held-to-maturity. Held-to-maturity securities are carried at amortized cost as it is the intent of the Company to hold these securities until maturity.
Allowance for Doubtful Accounts	'
	Allowance for Doubtful Accounts
	In the normal course of business, the Company provides unsecured credit terms to its customers. Accordingly, the Company maintains an allowance for doubtful accounts for possible losses on uncollectible accounts receivable. The Company routinely analyzes accounts receivable and considers history, customer creditworthiness, facts and circumstances specific to outstanding balances, current economic trends, and payment term changes when evaluating adequacy of the allowance for doubtful accounts. For uncollectible accounts receivable, the Company records a loss against the allowance for doubtful accounts only after exhaustive efforts have been made to collect.
Inventories	'
	Inventories
	Inventories are stated at the lower of standard cost (which approximates actual cost on a first-in, first-out basis) or market. General market conditions, as well as the Company's design activities, can cause certain of its products to become obsolete. The Company records provisions for potential excess and obsolete inventories based upon a regular analysis of inventory on hand compared to historical and projected end-user demand. These provisions can influence results from operations. For example, when demand for a given part falls, all or a portion of the related inventory, that is considered to be in excess of anticipated demand, is reserved, impacting cost of revenues and gross profit. If demand recovers and the parts previously reserved are sold, a higher than normal margin will generally be recognized. However, the majority of product inventory that has been previously reserved is ultimately discarded. Although the Company does sell some products that have previously been written down, such sales have historically been relatively consistent on a quarterly basis and the related impact on the Company's gross profit has not been material.
Property, Plant and Equipment	'
	Property, Plant and Equipment
	Property, plant and equipment are recorded at cost and are depreciated over estimated useful lives of 30-50 years for buildings and 3-20 years for machinery and equipment using accelerated and straight-line methods. Expenditures for maintenance and repairs are charged to operations in the period in which the expense is incurred. When assets are retired or otherwise disposed of, the related costs and accumulated depreciation are removed from the accounts and any resulting gain or loss is reflected in operations in the period realized.
	The Company evaluates the recoverability of the carrying amount of its property, plant and equipment whenever events or changes in circumstances indicate that the carrying amount of an asset group may not be fully recoverable. A potential impairment charge is evaluated when the undiscounted expected cash flows derived from an asset group are less than its carrying amount. Impairment losses are measured as the amount by which the carrying value of an asset group exceeds its fair value and are recognized in operating results. Judgment is used when applying these impairment rules to determine the timing of the impairment test, the undiscounted cash flows used to assess impairments and the fair value of an impaired asset group. The dynamic economic environment in which the Company operates and the resulting assumptions used to estimate future cash flows impact the outcome of these impairment tests.
Business Combination Purchase Price Allocation	'
	Business Combination Purchase Price Allocation
	The allocation of the purchase price of business combinations is based on management estimates and assumptions, and other information compiled by management, which utilizes established valuation techniques appropriate for the high-technology industry. These techniques include the income approach, cost approach or market approach, depending upon which approach is the most appropriate based on the nature and reliability of available data. The income approach is predicated upon the value of the future cash flows that an asset is expected to generate over its economic life. The cost approach takes into account the cost to replace (or reproduce) the asset and the effects on the asset's value of physical, functional and/or economic obsolescence that has occurred with respect to the asset. The market approach is used to estimate value from an analysis of actual transactions or offerings for economically comparable assets available as of the valuation date.
Goodwill	'
	Goodwill
	Goodwill represents the excess of the purchase price over the estimated fair value of the net assets acquired in the Company's acquisitions. See Note 5: "Goodwill and Intangible Assets" and Note 4: "Acquisitions" for additional information.
	The Company evaluates its goodwill for potential impairment annually during the fourth quarter and whenever events or changes in circumstances indicate the carrying value of goodwill may not be recoverable. Determining the fair value of the Company's reporting units is subjective in nature and involves the use of significant estimates and assumptions, including projected net cash flows, discount and long-term growth rates. The Company determines the fair value of its reporting units based on an income approach, whereby the fair value of the reporting unit is derived from the present value of estimated future cash flows. Estimates of the future cash flows associated with the businesses are critical to these assessments. The assumptions about future conditions include factors such as future revenues, gross profits, operating expenses, and industry trends. The Company considers historical rates and current market conditions when determining the discount and long-term growth rates to use in its analysis. The Company considers other valuation methods, such as the cost approach or market approach, if it is determined that these methods provide a more representative approximation of fair value. Changes in these estimates based on evolving economic conditions or business strategies could result in material impairment charges in future periods. The Company bases its fair value estimates on assumptions it believes to be reasonable. Actual future results may differ from those estimates.
	When evaluating goodwill for impairment, the Company may initially perform a qualitative assessment which includes a review and analysis of certain quantitative factors to estimate if its reporting units' fair values significantly exceed their carrying values. When the estimate of a reporting unit's fair value appears more likely than not to be less than its carrying value based on this qualitative assessment, the Company continues to the first step of a two step impairment test.
	The first step of the goodwill impairment test compares the fair value of the reporting unit to its carrying value. If the fair value of the reporting unit exceeds the carrying value of the net assets associated with that unit, goodwill is not considered impaired and the Company is not required to perform further testing. If the carrying value of the net assets associated with the reporting unit exceeds the fair value of the reporting unit, then the Company must perform the second step of the goodwill impairment test in order to determine the implied fair value of the reporting unit’s goodwill. If, during this second step, the Company determines that the carrying value of a reporting unit’s goodwill exceeds its implied fair value, the Company would record an impairment loss equal to the difference.
	The Company has determined that its product families, which are components of its operating segments, constitute reporting units for purposes of allocating and testing goodwill. The Company's product families are one level below its operating segments, with the Company's segment management conducting regular reviews of the operating results for each product family. As of each acquisition date, all goodwill acquired was assigned to the product families that were expected to benefit from the synergies of the respective acquisition. The amount of goodwill assigned to each reporting unit was the difference between the fair value of the acquired business included in a reporting unit and the fair value of identifiable assets and liabilities allocated to the reporting unit as of the acquisition date.
Intangible Assets	'
	Intangible Assets
	The Company's acquisitions have resulted in intangible assets consisting of values assigned to IP, assembled workforce, customer relationships, non-compete agreements, patents, developed technology, trademarks, acquired software and IPRD. These are stated at cost less accumulated amortization, are amortized over their estimated useful lives ranging from less than 1 year to 18 years, and are reviewed for impairment when facts or circumstances suggest that the carrying value of the asset group containing these assets may not be recoverable. A potential impairment charge is evaluated when the undiscounted expected cash flows derived from an asset group are less than its carrying amount. Impairment losses are measured as the amount by which the carrying value of an asset group exceeds its fair value and are recognized in operating results. Judgment is used when applying these impairment rules to determine the timing of the impairment test, the undiscounted cash flows used to assess impairments and the fair value of an impaired asset group. The dynamic economic environment in which the Company operates and the resulting assumptions used to estimate future cash flows impact the outcome of these impairment tests. See Note 5: "Goodwill and Intangible Assets" for additional information.
Treasury Stock	'
	Treasury Stock
	Treasury stock is recorded at cost, inclusive of fees, commissions and other expenses, when outstanding common shares are repurchased or otherwise acquired by the Company, including when outstanding shares are withheld to satisfy tax withholding obligations in connection with certain shares pursuant to restricted stock units under the Company's share-based compensation plans. See Note 9: "Earnings Per Share and Equity" for additional information.
Debt Issuance Costs	'
	Debt Issuance Costs
	Debt issuance costs are capitalized and amortized over the term of the underlying agreements using the effective interest method and, for the Company's convertible notes, are amortized through the first put date, which the Company considers to be the earliest maturity date. Upon prepayment of debt, the related unamortized debt issuance costs are charged to expense. Amortization of debt issuance costs is included in interest expense while the unamortized balance is included in other assets. See Note 8: "Long-Term Debt - Loss on Debt Repurchase or Exchange" for additional information.
Revenue Recognition	'
	Revenue Recognition
	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 manufacturing services provided to customers.
	The Company recognizes revenue on sales to OEMs, distributors that are not entitled to returns and allowances, electronic manufacturing service providers and on sales of manufacturing services, net of provisions for related sales returns and allowances. Revenue is recognized when persuasive evidence of an arrangement exists, title and risk of loss pass to the customer (which is generally upon shipment), the price is fixed or determinable and collectability is reasonably assured.
	For products sold to distributors who are entitled to returns and allowances, the Company recognizes the related revenue and cost of revenues when it is informed by the distributor that it has resold the products to the end-user. As a result of the Company's inability to reliably estimate up front the effects of the returns and allowances with these distributors, the Company defers the related revenue and gross margin on sales to these distributors until it is informed by the distributor that the products have been resold to the end-user. Although payment terms vary, most distributor agreements require payment within 30 days.
	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 statement of operations.
	Sales returns and allowances are estimated based on historical experience. 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. Under the Company's general agreements, distributors are allowed to return any product that has been removed from the price book. In addition, agreements with distributors typically contain standard stock rotation provisions permitting limited levels of product returns. However, since the Company defers recognition of revenue and gross profit on sales to distributors until the distributor resells the product, due to the inability to reliably estimate up front the effect of the returns and allowances with these distributors, sales returns and allowances have minimal impact on the results of operations. Provisions for discounts and rebates to customers, estimated returns and allowances, and other adjustments are provided for in the same period the related revenues are recognized, and are netted against revenues. The Company reviews warranty and related claims activities and records adjustments, as necessary.
	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 approved specifications. The Company's standard warranty extends for a period that is the greater of (i) two years from the date of shipment or (ii) the period of time specified in the customer's standard warranty (provided that the customer's standard warranty is stated in writing and extended to purchasers at no additional charge). At the time revenue is recognized, the Company establishes an accrual for estimated warranty expenses associated with its sales, recorded as a component of cost of revenues. In addition, the Company also offers cash discounts to certain customers for payments received within an agreed upon time, generally 10 days after shipment. The Company records a reserve for cash discounts as a reduction to accounts receivable and a reduction to revenues, based on experience with each customer.
	Freight and handling costs are included in cost of revenues and are recognized as period expense during the period in which they are incurred.
Research and Development Costs	'
	Research and Development Costs
	Research and development costs are expensed as incurred.
Share-Based Compensation	'
	Share-Based Compensation
	Share-based compensation cost is measured at the grant date, based on the estimated fair value of the award, and is recognized as expense over the employee's requisite service period. The Company has outstanding awards with performance, time and service-based vesting provisions. See Note 10: "Share-Based Compensation" for additional information.
Income Taxes	'
	Income Taxes
	Income taxes are accounted for using the asset and liability method. Under this method, deferred income tax assets and liabilities are recognized for the future tax consequences attributable to temporary differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases. Deferred income tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which these temporary differences are expected to be recovered or settled. The effect on deferred tax assets and liabilities of a change in tax rates is recognized in income in the period that includes the enactment date. A valuation allowance is provided for those deferred tax assets for which management cannot conclude that it is more likely than not that such deferred tax assets will be realized.
	In determining the amount of the valuation allowance, estimated future taxable income, as well as feasible tax planning strategies for each taxing jurisdiction are considered. If the Company determines it is more likely than not that all or a portion of the remaining deferred tax assets will not be realized, the valuation allowance will be increased with a charge to income tax expense. Conversely, if the Company determines it is more likely than not to be able to utilize all or a portion of the deferred tax assets for which a valuation allowance has been provided, the related portion of the valuation allowance will be released to income as a reduction to income tax expense.
	The Company recognizes and measures benefits for uncertain tax positions using a two-step approach. The first step is to evaluate the tax position taken or expected to be taken in a tax return by determining if the weight of available evidence indicates that is it more likely than not that the tax positions will be sustained upon audit, including resolution of any related appeals or litigation processes. For tax positions that are more likely than not to be sustained upon audit, the second step is to measure the tax benefit as the largest amount that is more than 50% likely to be realized upon settlement. The Company's practice is to recognize interest and/or penalties related to income tax matters in income tax expense. Significant judgment is required to evaluate uncertain tax positions. Evaluations are based upon a number of factors, including changes in facts or circumstances, changes in tax law, correspondence with tax authorities during the course of audits and effective settlement of audit issues. Changes in the recognition or measurement of uncertain tax positions could result in material increases or decreases in income tax expense in the period in which the change is made, which could have a material impact on the Company's effective tax position.
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.
	The Company's Japanese subsidiaries utilize 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.
Defined Benefit Pension Plans	'
	Defined Benefit Pension Plans
	The Company maintains defined benefit pension plans, covering certain of its foreign employees. For financial reporting purposes, net periodic pension costs and pension obligations are determined based upon a number of actuarial assumptions, including discount rates for plan obligations, assumed rates of return on pension plan assets and assumed rates of compensation increases for employees participating in plans. These assumptions are based upon management's judgment and consultation with actuaries, considering all known trends and uncertainties. See Note 11: "Employee Benefit Plans" for additional information.
Contingencies	'
	Contingencies
	The Company is involved in a variety of legal matters that arise in the normal course of business. Based on information available, management evaluates the relevant range and likelihood of potential outcomes and records the appropriate liability when the amount is deemed probable and reasonably estimable.
Fair Value Measurement	'
	Fair Value Measurement
	The Company measures certain of its financial and non-financial assets at fair value by using a fair value hierarchy that prioritizes certain inputs into individual fair value measurement approaches. Fair value is the exchange price that would be received for an asset or paid to transfer a liability in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. Valuation techniques used to measure fair value must maximize the use of observable inputs and minimize the use of unobservable inputs. The fair value hierarchy is based on three levels of inputs, of which the first two are considered observable and the last unobservable, that may be used to measure fair value, as follows:
	•	Level 1 - Quoted prices in active markets for identical assets or liabilities;
	•	Level 2 - Inputs other than Level 1 that are observable, either directly or indirectly, such as quoted prices for similar assets or liabilities; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities;
	•	Level 3 - Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities.
	Companies may choose to measure certain financial instruments and certain other items at fair value. Unrealized gains and losses on items for which the fair value option has been elected must be reported in earnings. The Company has elected not to carry any of its debt instruments at fair value. See Note 13: "Fair Value Measurements" for additional information.
Recent Accounting Pronouncements	'
	Recent Accounting Pronouncements
	ASU No. 2013-11 - “Income Taxes (Topic 740): Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit Carryforward Exists” (“ASU 2013-11”)
	In July 2013, the FASB issued ASU 2013-11, which applies to the financial statement presentation of an unrecognized tax benefit when a net operating loss carryforward, a similar tax loss, or a tax credit carryforward exists. Pursuant to ASU 2013-11, an unrecognized tax benefit, or a portion of an unrecognized tax benefit, should be presented in the financial statements as a reduction to a deferred tax asset for a net operating loss carryforward, a similar tax loss, or a tax credit carryforward, with certain exceptions. The amendments contained in ASU 2013-11 do not require new recurring disclosures. The related amendments are effective for reporting periods beginning after December 15, 2013; however early adoption is permitted. ASU 2013-11 is not expected to have a material impact on the Company's consolidated financial statements.

Acquisitions_Tables

Acquisitions (Tables)	12 Months Ended
	Dec. 31, 2013
Acquisition of SANYO Semiconductor Co., LTD	'
Schedule of Business Acquisitions, by Acquisition [Table Text Block]	'
	The following table presents the fair values of the net assets of SANYO Semiconductor as acquired (in millions):
		Fair Value
	Cash and cash equivalents	$	117.1
	Receivables, net	242.1
	Inventories	400.3
	Other current assets	119.7
	Property, plant and equipment	146.7
	Intangible assets	55.7
	Other non-current assets	75.4
	Total assets acquired	1,157.00
	Accounts payable	(300.0		)
	Other current liabilities	(152.0		)
	Long-term accrued liabilities	(200.8		)
	Total liabilities assumed	(652.8		)
	Net assets acquired	504.2
	Gain on acquisition	(24.3		)
	Purchase price	$	479.9
Acquisition of the CMOS Image Sensor Business Unit from Cypress Semiconductor	'
Schedule of Business Acquisitions, by Acquisition [Table Text Block]	'
	The following table presents the allocation of the purchase price of the ISBU to the assets acquired and liabilities assumed on February 27, 2011 based on their fair values (in millions):
		Allocation
	Cash and cash equivalents	$	1.5
	Receivables, net	2.6
	Inventories	9.2
	Other current assets	0.4
	Property, plant and equipment	1.2
	Goodwill	7.5
	Intangible assets	11.2
	In-process research and development	11.2
	Total assets acquired	44.8
	Accounts payable	(5.6		)
	Other current liabilities	(3.7		)
	Other non-current liabilities	(1.4		)
	Total liabilities assumed	(10.7		)
	Net assets acquired	$	34.1

Goodwill_And_Intangible_Assets1

Goodwill And Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2013
Goodwill and Intangible Assets Disclosure [Abstract]	'
Summary of Goodwill by Operating Segment	'
	The following table summarizes goodwill by relevant reportable segment as of December 31, 2013 and December 31, 2012 (in millions):
			Balance as of December 31, 2013															Balance as of December 31, 2012
			Goodwill				Accumulated Amortization				Accumulated Impairment Losses				Carrying Value			Goodwill			Accumulated Amortization			Accumulated Impairment Losses			Carrying Value
	Operating Segment:
	Application Products Group		$	547.4			$	(4.2	)		$	(406.0	)		$	137.2		$	547.4		$	(4.2	)	$	(406.0	)	$	137.2
	Standard Products Group		76				(5.6		)		(23.0		)		47.4			76			(5.6		)	(23.0		)	47.4
			$	623.4			$	(9.8	)		$	(429.0	)		$	184.6		$	623.4		$	(9.8	)	$	(429.0	)	$	184.6
Schedule Of Change In Goodwill	'
	The following table summarizes the change in goodwill from December 31, 2011 to December 31, 2013 (in millions):
	Net balance as of December 31, 2011		$	198.7
	Impairment charge		(14.1		)
	Net balance as of December 31, 2012		184.6
	Impairment charge		—
	Net balance as of December 31, 2013		$	184.6
Summary of Intangible Assets, Net	'
	Intangible assets, net were as follows as of December 31, 2013 and December 31, 2012 (in millions):
		December 31, 2013
		Original				Accumulated				Foreign Currency				Accumulated Impairment			Carrying			Useful Life
		Cost				Amortization				Translation Adjustment							Value			(in Years)
	Intellectual property	$	13.9			$	(9.4	)		$	—			$	(0.4	)	$	4.1		12-May
	Customer relationships	280.3				(105.5		)		(27.4		)		(23.0		)	124.4			18-May
	Patents	43.7				(19.0		)		—				(13.7		)	11			12
	Developed technology	146.2				(66.7		)		—				(2.4		)	77.1			12-May
	Trademarks	14				(6.1		)		—				(1.1		)	6.8			15
	Total intangibles	$	498.1			$	(206.7	)		$	(27.4	)		$	(40.6	)	$	223.4
		December 31, 2012
		Original				Accumulated				Foreign Currency				Accumulated Impairment			Carrying			Useful Life
		Cost				Amortization				Translation Adjustment							Value			(in Years)
	Intellectual property	$	13.9			$	(8.7	)		$	—			$	(0.4	)	$	4.8		12-May
	Customer relationships	280.3				(91.8		)		(26.9		)		(23.0		)	138.6			18-May
	Patents	43.7				(16.6		)		—				(13.7		)	13.4			12
	Developed technology	146.2				(51.3		)		—				(2.4		)	92.5			12-May
	Trademarks	14				(5.2		)		—				(1.1		)	7.7			15
	Total intangibles	$	498.1			$	(173.6	)		$	(26.9	)		$	(40.6	)	$	257
Summary of Amortization Expense	'
	Amortization expense for intangible assets is expected to be as follows over the next five years, and thereafter (in millions):
		Total
	2014	$	32.6
	2015	31.7
	2016	30.6
	2017	27.7
	2018	24.4
	Thereafter	76.4
	Total estimated amortization expense	$	223.4

Restructuring_Asset_Impairment1

Restructuring, Asset Impairments And Other, Net (Tables)	12 Months Ended
	Dec. 31, 2013
Restructuring Charges [Abstract]	'
Reconciliation Of "Restructuring, Asset Impairments And Other, Net" Caption On The Consolidated Statement Of Operations	'
	A summary description of the activity included in the “Restructuring, Asset Impairments and Other, net” caption on the Company's Consolidated Statements of Operations and Comprehensive Income for the years ended December 31, 2013, 2012 and 2011 is as follows (in millions):
		Restructuring		Asset Impairments		Other			Total
	Year Ended December 31, 2013
	System Solutions Group Voluntary Retirement Programs	52.9		—		(15.6		)	37.3
	Aizu facility closure	3.1		—		(22.4		)	(19.3		)
	KSS facility closure	6.5		3.5		—			10
	Other (1)	4.8		4.5		(4.1		)	5.2
	Total	$	67.3	$	8	$	(42.1	)	$	33.2
	Year Ended December 31, 2012
	2012 global workforce reduction	$	11.2	$	—	$	—		$	11.2
	System Solutions Group asset impairment	—		94.4		—			94.4
	System Solutions Group Voluntary Retirement Program	47.6		—		(11.7		)	35.9
	Aizu facility closure	9		4.5		0.1			13.6
	System Solutions Group consolidation	3.6		—		—			3.6
	Other (1)	2		4.1		0.5			6.6
	Total	$	73.4	$	103	$	(11.1	)	$	165.3
	Year Ended December 31, 2011
	Thailand facility closure	$	5.7	$	24.8	$	(18.6	)	$	11.9
	Aizu facility closure	6.5		61.5		2			70
	System Solutions Group consolidation	10		—		—			10
	Japan earthquake and tsunami	—		—		4.8			4.8
	Phoenix wafer manufacturing facility closure	4.3		—		—			4.3
	Other (1)	1.2		—		0.5			1.7
	Total	$	27.7	$	86.3	$	(11.3	)	$	102.7
	(1)    Includes charges related to the certain reductions in workforce, certain acquisitions, other facility closures, asset disposal activity and certain other activity which is not considered to be significant.
Rollforward Of Accrued Restructuring Charges	'
	The following is a rollforward of the accrued restructuring charges from December 31, 2012 to December 31, 2013 (in millions):
		Balance as of December 31, 2012		Charges		Usage			Adjustments			Balance as of December 31, 2013
	Estimated employee separation charges	$	15.5	$	62.2	$	(50.9	)	$	(1.6	)	$	25.2
	Estimated costs to exit	1.6		5.1		(5.7		)	—			1
	Total	$	17.1	67.3		(56.6		)	(1.6		)	26.2
	The following is a rollforward of the accrued restructuring charges from December 31, 2011 to December 31, 2012 (in millions):
		Balance as of December 31, 2011		Charges		Usage			Adjustments			Balance as of December 31, 2012
	Estimated employee separation charges	$	8.9	$	67.8	$	(60.7	)	$	(0.5	)	$	15.5
	Estimated costs to exit	8.4		5.6		(12.2		)	(0.2		)	1.6
	Total	$	17.3	$	73.4	$	(72.9	)	$	(0.7	)	$	17.1

Balance_Sheet_Information_Tabl

Balance Sheet Information (Tables)	12 Months Ended
	Dec. 31, 2013
Balance Sheet Related Disclosures [Abstract]	'
Supplemental Balance Sheet Information	'
	Balance Sheet Information
	Certain significant amounts included in the Company's balance sheet as of December 31, 2013 and December 31, 2012 consist of the following (dollars in millions):
		December 31, 2013				December 31, 2012
	Receivables, net:
	Accounts receivable	$	384.4			$	360.5
	Less: Allowance for doubtful accounts	(1.0		)		(2.7		)
		$	383.4			$	357.8
	Inventories:
	Raw materials	$	89.2			$	73.2
	Work in process	319.6				310.9
	Finished goods	203				197.6
		$	611.8			$	581.7
	Other Current Assets:
	Prepaid expenses	$	24.8			$	24.3
	Value added and other income tax receivables	31.7				34.3
	Other	32.8				63.6
		$	89.3			$	122.2
	Property, plant and equipment, net: (1)
	Land	$	52.3			$	67.4
	Buildings	467.7				572.4
	Machinery and equipment	1,918.40				1,979.40
	Total property, plant and equipment	2,438.40				2,619.20
	Less: Accumulated depreciation	(1,364.2		)		(1,515.9		)
		$	1,074.20			$	1,103.30
	Accrued expenses:
	Accrued payroll	$	91.3			$	102.9
	Sales related reserves	54.2				64.9
	Restructuring reserves	26.2				17.1
	Accrued pension liability	10.4				7.4
	Accrued interest	1.9				0.6
	Other	36.3				63.8
		$	220.3			$	256.7
	-1	Included in property, plant and equipment are $8.7 million of fixed assets that are held-for-sale as of December 31, 2013.
Warranty Reserves	'
	The activity related to the Company's warranty reserves for 2011, 2012 and 2013 follows (in millions):
	Balance as of December 31, 2010		$	3.3
	Provision		4
	Usage		(1.5		)
	Balance as of December 31, 2011		5.8
	Provision		8.1
	Usage		(3.7		)
	Balance as of December 31, 2012		10.2
	Provision		4.4
	Usage		(8.6		)
	Balance as of December 31, 2013		$	6

LongTerm_Debt_Tables

Long-Term Debt (Tables)	12 Months Ended
	Dec. 31, 2013
Long-term Debt, Unclassified [Abstract]	'
Long-Term Debt	'
	ong-term debt consists of the following (dollars in millions):
		December 31, 2013				December 31, 2012
	Senior Revolving Credit Facility due 2018, interest payable quarterly at 2.00% and 0% respectively	$	120			$	—
	Loan with Japanese bank due 2014 through 2018, interest payable quarterly at 2.00% and 2.06%, respectively (1)	273.7				302
	2.625% Notes (net of discount of zero and $7.1 million, respectively) (2)	—				125.5
	2.625% Notes, Series B (net of discount of $21.7 million and $24.2 million, respectively) (3)	335.2				274.2
	1.875% Notes (4)	—				73.4
	Loan with Hong Kong bank, interest payable weekly at 1.91% and 1.96%, respectively (6)	40				30
	Loans with Philippine banks due 2014 through 2015, interest payable monthly and quarterly at an average rate of 2.16% and 1.97%, respectively (8)	39.2				45.8
	Loan with Chinese bank due 2014, interest payable quarterly at 3.34% and 3.41%, respectively (9)	7				7
	Loan with Japanese bank due 2013, interest payable monthly at 0.00% and 1.58%, respectively (9)	—				0.8
	Loan with Singapore bank, interest payable weekly at 1.94% and 1.95%, respectively (6)	15				15
	Loan with British finance company, interest payable monthly at 1.57% and 1.51%, respectively (6)	0.2				3.3
	U.S. real estate mortgages payable monthly through 2016 at an average rate of 4.86% (7)	28.1				29.8
	U.S. equipment financing payable monthly through 2016 at 2.94% (5)	9.5				14
	Canada equipment financing payable monthly through 2017 at 3.81% (5)	5.9				—
	Canada revolving line of credit, interest payable quarterly at 1.84% (9)	15				—
	Capital lease obligations	53.4				91.1
	Long-term debt, including current maturities	942.2				1,011.90
	Less: Current maturities	(181.6		)		(353.6		)
	Long-term debt	$	760.6			$	658.3
	_______________________
	-1	This loan represents SCI LLC's unsecured loan with SMBC, which is guaranteed by the Company. See additional information below under the heading "Note Payable to SMBC."
	-2	The 2.625% Notes were redeemed by the Company on December 20, 2013.
	-3	The 2.625% Notes, Series B may be put back to the Company at the option of the holders of the notes on December 15 of 2016 and 2021 or called at the option of the Company on or after December 20, 2016.
	-4	The 1.875% Notes were partially redeemed by the Company on December 20, 2012. The balance as of December 31, 2012 for notes submitted for conversion was subject to a 20 consecutive trading-day observation period and was subsequently settled during January 2013.
	-5	Debt arrangement secured by equipment.
	-6	Debt arrangement secured by accounts receivable.
	-7	Debt arrangement secured by real estate.
	-8	$15.0 million unsecured and $24.2 million secured by equipment and $7.5 million unsecured and $38.3 million secured by equipment, respectively.
	-9	Unsecured debt arrangement.
Annual Maturities Relating To Long-Term Debt	'
	Annual maturities relating to the Company’s long-term debt as of December 31, 2013 are as follows (in millions):
			Annual
			Maturities
	2014		181.6
	2015		74
	2016		424.9
	2017		39
	2018		243.5
	Thereafter		0.9
	Total		$	963.9
Schedule of Long-term Debt Instruments, Summary of Exchanges	'
	The 2.625% Notes, Series B are fully and unconditionally guaranteed on an unsecured senior subordinated basis by certain existing domestic subsidiaries of the Company (dollars in millions):
			For the years ended December 31,
			2013				2012			2011
	Exchange date		22-Mar-13				4-Sep-12			15-Dec-11
	Principal value of 2.625% Notes		$	60			$	99.9		$	198.6
	Principal value of 2.625% Notes, Series B		$	58.5			$	99.9		$	198.6
	Cash consideration		$	—			$	2		$	15.9
	Capitalized exchange expenses (1)		$	0.1			$	0.6		$	1.4
	Effective interest rate		4.7		%		4.4		%	5.25		%
	(1)     Represents exchange expenses capitalized as debt issuance costs that are amortized using the effective
	interest method through the first put date of December 15, 2016.

Earnings_Per_Share_and_Equity_

Earnings Per Share and Equity (Tables)	12 Months Ended
	Dec. 31, 2013
Stockholders' Equity Note [Abstract]	'
Schedule of Share Repurchase Program [Table Text Block]	'
	Share Repurchase Program
	Information relating to the Company's share repurchase program is as follows (in millions, except per share data):
		For the years ended December 31,
		2013			2012
	Number of repurchased shares (1)	13.9			8.8
	Aggregate purchase price	$	101.3		$	55.3
	Fees, commissions and other expenses	0.3			0.2
	Less: accrued share repurchases (2)	(0.6		)	—
	Total cash used for share repurchases	$	101		$	55.5
	Weighted-average purchase price per share	$	7.29		$	6.26
	Available for future purchases at period end	$	143.4		$	244.7
	(1)    None of these shares had been reissued or retired as of December 31, 2013, but may be reissued or retired by
	the Company at a later date.
	(2)    Represents unpaid amounts recorded in accrued expenses on the Company's Consolidated Balance Sheet.
Income Per Share Calculations	'
	Calculations of net income per common share attributable to ON Semiconductor are as follows (in millions, except per share data):
		For the years ended December 31,
		2013			2012			2011
	Net income (loss) attributable to ON Semiconductor Corporation	$	150.8		$	(90.6	)	$	11.6
	Basic weighted average common shares outstanding	447.9			452.6			446.7
	Add: Incremental shares for:
	Dilutive effect of share-based awards	2.8			—			7.6
	Dilutive effect of convertible notes	—			—			2.9
	Diluted weighted average common shares outstanding	450.7			452.6			457.2
	Net income (loss) per common share attributable to ON Semiconductor Corporation:
	Basic	$	0.34		$	(0.20	)	$	0.03
	Diluted	$	0.33		$	(0.20	)	$	0.03

ShareBased_Compensation_Tables

Share-Based Compensation (Tables)	12 Months Ended
	Dec. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]	'
Summary Of Share-Based Compensation Expense	'
	Total share-based compensation expense related to the Company's employee stock options, restricted stock units, stock grant awards and ESPP for the years ended December 31, 2013, 2012 and 2011 was comprised as follows (in millions):
			Year Ended December 31, 2013				Year Ended December 31, 2012				Year Ended December 31, 2011
	Cost of revenues		$	5.3			$	3.7			$	6.3
	Research and development		6.3				4.5				6.9
	Selling and marketing		5.7				4.3				6.4
	General and administrative		15				8				13.9
	Restructuring		—				—				—
	Share-based compensation expense before income taxes		32.3				20.5				33.5
	Related income tax benefits (1)		—				—				—
	Share-based compensation expense, net of taxes		$	32.3			$	20.5			$	33.5
	____________________
	-1	A majority of the Company’s share-based compensation relates to its domestic subsidiaries; therefore, no related deferred income tax benefits are recorded due to historical net operating losses at those subsidiaries.
Weighted-Average Assumptions Of Employee Stock Options	'
	The weighted-average estimated fair value of employee stock options and the weighted-average assumptions used in the lattice model to calculate the weighted-average estimated fair value of employee stock options granted during the years ended December 31, 2013, 2012 and 2011 are as follows (annualized percentages):
			Year Ended December 31, 2013				Year Ended December 31, 2012				Year Ended December 31, 2011
	Volatility		42.8		%		46.9		%		52.1		%
	Risk-free interest rate		1.4		%		0.8		%		1.2		%
	Expected term		5.2 years				5.0 years				4.8 years
	Weighted-average fair value per option		$	2.93			$	3.01			$	3.88
Summary Of Stock Option Plans	'
	A summary of stock option transactions for all stock option plans follows (in millions except per share and term data):
			Year Ended December 31, 2013
			Number of Shares			Weighted-Average Exercise Price				Weighted Average Remaining Contractual Term (in years)		Aggregate Intrinsic Value
	Outstanding at December 31, 2012		17.2			$	7.7
	Granted		0.1			7.39
	Exercised		(2.1	)		5.82
	Canceled		(1.2	)		8.67
	Outstanding at December 31, 2013		14			$	7.89			3.4		$	14.8
	Exercisable at December 31, 2013		11.6			$	7.99			3.1		$	12.4
Additional Information On Stock Options Outstanding	'
	Additional information about stock options outstanding at December 31, 2013 with exercise prices less than or above $8.24 per share, the closing price of the Company's common stock at December 31, 2013, follows (number of shares in millions):
			Exercisable							Unexercisable					Total
	Exercise Prices		Number of Shares			Weighted Average Exercise Price				Number of Shares			Weighted Average Exercise Price		Number of Shares	Weighted Average Exercise Price
	Less than $8.24		6.2			$	6.23			1.6			$	6.75	7.8	$	6.33
	Above $8.24		5.4			$	9.97			0.8			$	8.86	6.2	$	9.82
	Total outstanding		11.6			$	7.99			2.4			$	7.45	14	$	7.89
Summary Of Restricted Stock Units Transactions	'
	A summary of the restricted stock units transactions for the year ended December 31, 2013 follows (number of shares in millions):
			Year Ended December 31, 2013
			Number of Shares			Weighted-Average Grant Date Fair Value
	Nonvested shares of restricted stock units at December 31, 2012		8.9			$	8.75
	Granted		5.3			7.91
	Released		(2.3	)		7.83
	Canceled		(1.1	)		8.87
	Nonvested shares of restricted stock units at December 31, 2013		10.8			$	8.52

Employee_Benefit_Plans_Tables

Employee Benefit Plans (Tables)	12 Months Ended
	Dec. 31, 2013
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]	'
Summary Of Net Periodic Pension Cost	'
	The following is a summary of the status of the Company's foreign defined benefit pension plans and the net periodic pension cost (dollars in millions):
			Year Ended December 31,
			2013			2012			2011
	Service cost		$	12.2		$	7.5		$	9.4
	Interest cost		6.6			5.3			5.2
	Expected return on plan assets		(4.1		)	(3.5		)	(4.0		)
	Amortization of prior service cost		—			0.1			2.6
	Curtailment (gain) loss		(15.6		)	(6.6		)	2
	Actuarial and other loss (gain)		6.2			12.5			(3.1		)
	Total net periodic pension cost		$	5.3		$	15.3		$	12.1
	Weighted average assumptions
	Discount rate		2.14		%	2.44		%	3.5		%
	Expected return on plan assets		2.18		%	3.21		%	4.07		%
	Rate of compensation increase		3.17		%	3.05		%	4.66		%
Summary Of Status Of Foreign Pension Plans	'
			December 31,
			2013			2012
	Change in projected benefit obligation
	Projected benefit obligation at the beginning of the year		$	379.8		$	176.4
	Benefit obligation assumed upon withdrawal from Systems Solutions Group multi-employer plans		—			214.5
	Service cost		12.2			7.5
	Interest cost		6.6			5.3
	Net actuarial loss		14.3			13.9
	Benefits paid by plan assets		(22.3		)	(13.3		)
	Benefits paid by the Company		(32.1		)	(11.4		)
	Curtailment gain		(15.6		)	(6.6		)
	Translation gain and other		(50.6		)	(6.5		)
	Projected benefit obligation at the end of the year		$	292.3		$	379.8
	Accumulated benefit obligation at the end of the year		$	254.9		$	281.2
	Change in plan assets
	Fair value of plan assets at the beginning of the year		$	178.4		$	105.5
	Assets assumed due to withdrawal from multi-employer plans		—			83.6
	Transfer to defined contribution plan		—			(7.5		)
	Actual return on plan assets		12.2			5.4
	Benefits paid from plan assets		(22.3		)	(13.3		)
	Employer contributions		16.2			6.6
	Translation and other loss		(21.1		)	(1.9		)
	Fair value of plan assets at the end of the year		$	163.4		$	178.4
	Plans with underfunded or non-funded accumulated benefit obligation
	Aggregate accumulated benefit obligation		$	220.7		$	248.8
	Aggregate fair value of plan assets		$	116.2		$	124.8
	Amounts recognized in the balance sheet consist of
	Non-current assets		$	0.6		$	0.2
	Current liabilities		(10.4		)	(7.4		)
	Non-current liabilities		(119.1		)	(194.2		)
	Funded status		$	(128.9	)	$	(201.4	)
	Amounts recognized in accumulated other comprehensive income consist of
	Prior service cost		$	—		$	0.1
	Weighted average assumptions at the end of the year
	Discount rate		2.14		%	2.44		%
	Rate of compensation increase		3.17		%	3.05		%
Fair Value Measurement Of Plan Assets	'
	The fair value measurement of plan assets in the Company's foreign pension plans as of December 31, 2013 and 2012, was as follows (in millions):
			December 31, 2013
			Total			Quoted Prices in Active Markets for Identical Assets (Level 1)			Significant Observable Inputs (Level 2)			Significant Unobservable Inputs (Level 3)
	Asset Category
	Cash/Money Markets		$	7.5		$	7.5		$	—		$	—
	Foreign Government/Treasury Securities (1)		8.7			7.8			0.9			—
	Corporate Bonds, Debentures (2)		36.8			17.9			18			0.9
	Equity Securities (3)		29.4			19.9			9.5			—
	Mutual Funds		5.8			—			5.8			—
	Investment and Insurance Annuity Contracts (4)		75.2			—			27.3			47.9
			$	163.4		$	53.1		$	61.5		$	48.8
			December 31, 2012
			Total			Quoted Prices in Active Markets for Identical Assets (Level 1)			Significant Observable Inputs (Level 2)			Significant Unobservable Inputs (Level 3)
	Asset Category
	Cash/Money Markets		$	111.4		$	111.4		$	—		$	—
	Foreign Government/Treasury Securities (1)		12.6			9			3.6			—
	Corporate Bonds, Debentures (2)		4.4			0.4			0.7			3.3
	Mutual Funds		4.6			—			4.6			—
	Investment and Insurance Annuity Contracts (4)		45.4			—			0.7			44.7
			$	178.4		$	120.8		$	9.6		$	48
	-1	Includes investments primarily in guaranteed return securities.
	-2	Includes investments in government bonds and corporate bonds of developed countries, emerging market government bonds, emerging market corporate bonds and convertible bonds.
	-3	Includes investments in equity securities of developed countries and emerging markets.
	-4	Includes certain investments with insurance companies which guarantee a minimum rate of return on the investment.
Activity Of Plan Assets With Fair Value Measurement Using Significant Unobservable Inputs	'
	Activity during the year ended December 31, 2013 for plan assets with fair value measurement using significant unobservable inputs (Level 3) was as follows (in millions):
			Corporate Bonds, Debentures			Investment and Insurance Contacts			Total
	Balance at December 31, 2011		$	4.1		$	1		$	5.1
	Purchase, sales and settlements		(1.2		)	(0.3		)	(1.5		)
	Transfers in and/or out of Level 3		0.4			44			44.4
	Balance at December 31, 2012		$	3.3		$	44.7		$	48
	Actual return on plan assets		—			3.5			3.5
	Purchase, sales and settlements		(2.4		)	(0.3		)	(2.7		)
	Balance at December 31, 2013		$	0.9		$	47.9		$	48.8
Expected Benefit Payments	'
	The expected benefit payments for the Company's defined benefit plans by year from 2014 through 2018 and the five years thereafter are as follows (in millions):
	2014		$	44.4
	2015		2.3
	2016		2.3
	2017		2.6
	2018		3.5
	5 years thereafter		46.9
	Total		$	102

Commitments_And_Contingencies_

Commitments And Contingencies (Tables)	12 Months Ended
	Dec. 31, 2013
Commitments and Contingencies Disclosure [Abstract]	'
Operating Leases Future Minimum Payments Receivable	'
	The following is a schedule by year of future minimum lease obligations under non-cancelable operating leases as of December 31, 2013 (in millions):
	Year Ending December 31,
	2014	$	18.4
	2015	13.9
	2016	10.8
	2017	8.7
	2018	13.6
	Thereafter	26
	Total	$	91.4

Fair_Value_Of_Financial_Instru

Fair Value Of Financial Instruments (Tables)	12 Months Ended
	Dec. 31, 2013
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]	'
Fair Value Of Assets And Liabilities Measured On Recurring Basis	'
	The following table summarizes the Company's financial assets and liabilities measured at fair value on a recurring basis as of December 31, 2013 and December 31, 2012 (in millions):
	Description		Balance as of December 31, 2013			Quoted Prices in			Balance as of December 31, 2012			Quoted Prices in
						Active Markets (Level 1)						Active Markets (Level 1)
	Assets:
	Cash and cash equivalents:
	Demand and time deposits		$	447.5		$	447.5		$	385.9		$	385.9
	Money market funds		62			62			—			—
	Treasury securities		—			—			100.7			100.7
	Corporate bonds		—			—			0.3			0.3
	Other Current Assets:
	Foreign currency exchange contracts		$	—		$	—		$	3.2		$	3.2
	Liabilities:
	Foreign currency exchange contracts		$	0.1		$	0.1		$	—		$	—
Held-to-maturity Securities	'
	Short-term investments classified as held-to-maturity as of the years ended December 31, 2013 and 2012, respectively, were as follows (in millions):
			Balance at December 31, 2013									Balance at December 31, 2012
			Carried at Amortized Cost			Unrealized Gain/(Loss)			Fair Value			Carried at Amortized Cost		Unrealized Gain/(Loss)			Fair Value
	Short-term investments-held-to-maturity:
	Commercial paper		$	15.5		$	—		$	15.5		$	25.5	$	—		$	25.5
	Corporate bonds		93.7			—			93.7			119.3		(0.1		)	119.2
	Government agencies		7			—			7			—		—			—
			$	116.2		$	—		$	116.2		$	144.8	$	(0.1	)	$	144.7
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) at December 31, 2013 and December 31, 2012 are as follows (in millions):
		December 31, 2013						December 31, 2012
		Carrying Amount			Fair Value			Carrying			Fair Value
								Amount
	Long-term debt, including current portion
	Convertible Notes	$	335.2		$	392.6		$	473.1		$	530.9
	Long-term debt	$	510.2		$	511.4		$	403.9		$	380.6
Fair Value Measurements, Nonrecurring	'
	The following table shows the fair value of certain of the Company's non-financial assets included in its Consolidated Balance Sheet as of December 31, 2013 and December 31, 2012 that were remeasured at fair value on a nonrecurring basis (in millions):
			Fair Value
			31-Dec-13			31-Dec-12
	Nonrecurring fair value measurements
	Property, plant and equipment (Level 3)		$	8.7		$	134.1
	Intangible assets (Level 3)		—			8.2
			$	8.7		$	142.3
	The following table shows the adjustments to fair value of certain of the Company's non-financial assets that had an impact on the Company's results of operations during the years ended December 31, 2013 and December 31, 2012 (in millions):
			Year Ended
			31-Dec-13			31-Dec-12
	Nonrecurring fair value measurements
	Impairment of property, plant and equipment held for use or disposal (Level 3)		$	8		$	103
	Goodwill impairment (Level 3)		—			14.1
	Intangible asset impairments (level 3)		—			35.4
			$	8		$	152.5

Financial_Instruments_Tables

Financial Instruments (Tables)	12 Months Ended
	Dec. 31, 2013
Investments, All Other Investments [Abstract]	'
Schedule Of Net Foreign Exchange Positions	'
	The following schedule shows the Company's net foreign exchange positions in U.S. dollars as of December 31, 2013 and 2012 (in millions):
		December 31,
		2013 Buy (Sell)			2013 Notional Amount		2012 Buy (Sell)			2012 Notional Amount
	Euro	$	(30.5	)	$	30.5	$	(17.4	)	$	17.4
	Japanese Yen	(6.7		)	6.7		(123.3		)	123.3
	Malaysian Ringgit	35.8			35.8		32.7			32.7
	Philippine Peso	11.7			11.7		4.2			4.2
	Other currencies	10.6			17		(1.5		)	19.7
		$	20.9		$	101.7	$	(105.3	)	$	197.3

Income_Taxes_Tables

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2013
Income Tax Disclosure [Abstract]	'
Income (Loss) Before Income Taxes And Minority Interests	'
	The Company's geographic sources of income (loss) before income taxes and non-controlling interest are as follows (in millions):
		Year ended December 31,
		2013				2012				2011
	United States	$	(76.8	)		$	(72.0	)		$	(143.9	)
	Foreign	257.7				(0.9		)		181.7
		$	180.9			$	(72.9	)		$	37.8
Provision (Benefit) For Income Taxes	'
	provision for income taxes is as follows (in millions):
		Year ended December 31,
		2013				2012				2011
	Current:
	Federal	$	(0.4	)		$	0.2			$	0.5
	State and local	0.3				(0.1		)		0.3
	Foreign	15.9				16.4				25
		15.8				16.5				25.8
	Deferred:
	Federal	13.2				—				—
	Foreign	(2.1		)		(3.1		)		(2.9		)
		11.1				(3.1		)		(2.9		)
		$	26.9			$	13.4			$	22.9
Reconciliation Of The U.S. Federal Statutory Income Tax Rate	'
	A reconciliation of the U.S. federal statutory income tax rate to the Company's effective income tax rate is as follows:
			Year ended December 31,
			2013			2012			2011
	U.S. federal statutory rate		35		%	35		%	35		%
	Increase (decrease) resulting from:
	State and local taxes, net of federal tax benefit		0.2			0.1			0.7
	Foreign withholding taxes		—			(0.3	)		0.1
	Foreign rate differential		(38.5	)		10.4			(588.0	)
	Dividend income from foreign subsidiaries		10.6			(62.7	)		146.1
	Goodwill impairment		—			(6.8	)		—
	Gain on SANYO Semiconductor Transaction		—			—			(22.5	)
	Change in valuation allowance		8.2			(1.6	)		491.5
	Tax reserves		(0.9	)		(2.3	)		0.8
	Return to accrual		(0.1	)		12.3			—
	Other		0.4			(2.5	)		(3.1	)
			14.9		%	(18.4	)	%	60.6		%
Tax Effects Of Temporary Differences	'
	The tax effects of temporary differences in the recognition of income and expense for tax and financial reporting purposes that give rise to significant portions of the deferred tax assets, net of deferred tax liabilities as of December 31, 2013 and December 31, 2012, are as follows (in millions):
			Year ended December 31,
			2013				2012
	Net operating loss and tax credit carryforwards		$	1,023.90			$	952
	Tax-deductible goodwill and amortizable intangibles		(7.7		)		18.2
	Reserves and accruals		82.5				98.8
	Property, plant and equipment		81.4				147.2
	Inventories		28.1				83.8
	Other		105.2				116
	Deferred tax assets and liabilities before valuation allowance		1,313.40				1,416.00
	Valuation allowance		(1,327.2		)		(1,420.1		)
	Net deferred tax asset (liability)		$	(13.8	)		$	(4.1	)
Activity For Unrecognized Gross Tax Benefits	'
	The activity for unrecognized gross tax benefits for 2013, 2012, and 2011 (in millions) is as follows:
		2013				2012				2011
	Balance at beginning of year	$	34.8			$	18.6			$	13.4
	Reserves acquired	—				—				1.3
	Additions based on tax positions related to the current year	0.7				18.4				5.5
	Additions for tax positions of prior years	—				—				0.8
	Reductions for tax positions of prior years	(10.9		)		(0.8		)		(1.4		)
	Lapse of statute	(3.7		)		(1.2		)		(1.0		)
	Settlements	—				(0.2		)		—
	Balance at end of year	$	20.9			$	34.8			$	18.6

Changes_in_Accumulated_Other_C1

Changes in Accumulated Other Comprehensive Loss - (Tables)	12 Months Ended
	Dec. 31, 2013
Equity [Abstract]	'
Schedule of Accumulated Other Comprehensive Loss	'
	Amounts comprising the Company's accumulated other comprehensive loss and reclassifications for the year ended December 31, 2013 are as follows (net of tax of $0, in millions):
		Foreign Currency Translation Adjustments			Defined Benefit Pension Items			Effects of Cash Flow Hedges			Unrealized Gains and Losses on Available-for-Sale Securities		Total
	Balance as of December 31, 2012	$	(42.2	)	$	(0.1	)	$	0.8		$	0.4	$	(41.1	)
	Other comprehensive income (loss) prior to reclassifications	17.2			0.1			(0.1		)	—		17.2
	Amounts reclassified from accumulated other comprehensive loss	(21.0		)	—			(2.5		)	—		(23.5		)
	Net current period other comprehensive loss	(3.8		)	0.1			(2.6		)	—		(6.3		)
	Balance as of December 31, 2013	$	(46.0	)	$	—		$	(1.8	)	$	0.4	$	(47.4	)
Schedule of Reclassifications from Accumulated Other Comprehensive Loss	'
	Amounts which were reclassified from accumulated other comprehensive loss to the Company's Consolidated Statements of Operations and Comprehensive Income during the year ended December 31, 2013 were as follows (net of tax of $0, in millions):
		Amounts Reclassified from Accumulated Other Comprehensive Loss			Affected Line Item Where Net Income is Presented
	Foreign currency translation adjustments	$	(21.0	)	Restructuring, asset impairments and other, net
	Effects of cash flow hedges	(2.5		)	Other income and expense
	Total reclassifications	$	(23.5	)

Supplemental_Disclosures_Table

Supplemental Disclosures (Tables)	12 Months Ended
	Dec. 31, 2013
Supplemental Cash Flow Elements [Abstract]	'
Schedule of Cash Flow, Supplemental Disclosures	'
	The Company's non-cash financing activities and cash payments for interest and income taxes during the years ended December 31, 2013, 2012 and 2011 are as follows (in millions):
		Year ended December 31,
		2013			2012			2011
	Non-cash financing activities:
	Capital expenditures in accounts payable	$	55.8		$	54.4		$	58.8
	Equipment acquired or refinanced through capital leases	3.8			31			24.9
	Cash (received) paid for:
	Interest income	$	(1.3	)	$	(1.5	)	$	(1.1	)
	Interest expense	24.8			30.4			31.8
	Income taxes	12.9			17.6			20.4

Segment_Information_Tables

Segment Information (Tables)	12 Months Ended
	Dec. 31, 2013
Segment Reporting, Measurement Disclosures [Abstract]	'
Schedule of Segments and Product Lines	'
	Application Products Group		Standard Products Group		System Solutions Group
	Automotive ASSPs		Bipolar Power		Power MOSFETs
	Analog Automotive		Thyristor		IGBTs
	Automotive Power Switching		Small Signal		Power and Signal Discretes
	Automotive Mixed-Signal solutions		Zener		Intelligent Power Modules
	Medical ASICs & ASSPs		Protection		Motor Driver ICs
	Linear Light Sensors		Rectifier		Display Drivers
	CMOS Image Sensors		Filters		ASICs
	Mixed Signal ASICs		MOSFETs		Microcontrollers
	Industrial ASSPs		Signal & Interface		Flash Memory
	High Frequency / Timing		Standard Logic		Touch Sensor
	IPDs		LDO's & VREGs		Power Supply IC
	Foundry and Manufacturing Services		EE Memory and Programmable Analog		Audio DSP
	Hearing Components		IGBTs		Audio Tuners
	DC-DC Conversion				Image Stabilizer ICs
	Analog Switches				Auto Focus ICs
	AC-DC Conversion
	Low Voltage Power Management
	Power Switching
	RF Antenna Tuning Solutions
Segment Information Of Revenues, Gross Profit And Operating Income	'
	Revenues, gross profit and operating income for the Company’s reportable segments for the years ended December 31, 2013, December 31, 2012 and December 31, 2011, respectively, are as follows (in millions):
			Application Products Group				Standard			System Solutions Group			Total
							Products
							Group
	For year ended December 31, 2013:
	Revenues from external customers		$	1,036.30			$	1,121.20		$	625.2		$	2,782.70
	Segment gross profit		455.6				390.7			103.4			949.7
	Segment operating income (loss)		110.6				228.2			(66.3		)	272.5
	For year ended December 31, 2012:
	Revenues from external customers		$	1,019.20			$	1,104.70		$	771		$	2,894.90
	Segment gross profit		459.2				400.9			143.1			1,003.20
	Segment operating income (loss)		111.2				240			(91.8		)	259.4
	For year ended December 31, 2011:
	Revenues from external customers		$	1,145.50			$	1,236.50		$	1,060.30		$	3,442.30
	Segment gross profit		549				435.7			79.1			1,063.80
	Segment operating income (loss)		190.8				254.6			(159.4		)	286
Reconciliation Of Operating Profit (Loss) From Segments To Consolidated	'
	Depreciation and amortization expense is included in segment operating income. Reconciliations of segment gross profit and segment operating income to the financial statements are as follows (in millions):
		Year Ended
		December 31, 2013				December 31, 2012			December 31, 2011
	Gross profit for reportable segments	$	949.7			$	1,003.20		$	1,063.80
	Unallocated amounts:
	Other unallocated manufacturing costs	(11.3		)		(51.3		)	(55.0		)
	Gross profit	$	938.4			$	951.9		$	1,008.80
	Operating income for reportable segments	$	272.5			$	259.4		$	286
	Unallocated amounts:
	Restructuring and other charges	(33.2		)		(165.3		)	(102.7		)
	Goodwill and intangible impairment	—				(49.5		)	—
	Other unallocated manufacturing costs	(11.3		)		(51.3		)	(55.0		)
	Other unallocated operating expenses	(9.8		)		(9.6		)	(14.9		)
	Operating income (loss)	$	218.2			$	(16.3	)	$	113.4
Revenues By Geographic Location Including Local Sales And Exports	'
	Revenues by geographic location including local sales made by operations within each area, based on sales billed from the respective country, are summarized as follows (in millions):
		Year Ended
		December 31, 2013				December 31, 2012			December 31, 2011
	United States	$	415.4			$	452		$	524
	United Kingdom	400.2				388.3			424.7
	China	862.4				874.2			1,053.80
	Japan	290.2				401.2			494.8
	Singapore	700.6				627.7			683.3
	Other	113.9				151.5			261.7
		$	2,782.70			$	2,894.90		$	3,442.30
Summary Of Property, Plant And Equipment By Geographic Location	'
	Property, plant and equipment, net by geographic location, are summarized as follows (in millions):
		December 31,				December 31,			December 31,
		2013				2012			2011
	United States	$	255.3			$	274.7		$	257.5
	Czech Republic	111.1				118			91.6
	Malaysia	213.9				185			164.5
	Philippines	173.8				188.8			204
	Japan	61.3				78.9			130.2
	Other	258.8				257.9			261.7
		$	1,074.20			$	1,103.30		$	1,109.50

Supplementary_Financial_Inform1

Supplementary Financial Information (Tables)	12 Months Ended
	Dec. 31, 2013
Quarterly Financial Information Disclosure [Abstract]	'
Schedule of Quarterly Financial Information	'
	Consolidated quarterly financial information for 2013 and 2012 follows (in millions, except per share data):
		Quarter ended 2013
		29-Mar		28-Jun		27-Sep		31-Dec
	Revenues	$	661	$	688.3	$	715.4	$	718
	Gross Profit	204.5		231.8		249.2		252.9
	Net income attributable to ON Semiconductor Corporation (1)	22.6		47.7		51.8		28.7
	Diluted net income per common share attributable to ON Semiconductor Corporation	0.05		0.11		0.11		0.06
		Quarter ended 2012
		30-Mar		29-Jun		28-Sep		31-Dec
	Revenues	$	744.4	$	744.8	$	725.5	$	680.2
	Gross Profit	245.2		258.3		238		210.4
	Net income (loss) attributable to ON Semiconductor Corporation	28.2		6.9		12.5		(138.2		)
	Diluted net income (loss) per common share attributable to ON Semiconductor Corporation	0.06		0.02		0.03		(0.31		)

Recovered_Sheet1

Guarantor and Non-Guarantor Statements (Tables)	12 Months Ended
	Dec. 31, 2013
Guarantor And Non-Guarantor Statements [Abstract]	'
Notes To Consolidated Statement Of Balance Sheet	'
	Condensed consolidating financial information for the issuer of the Convertible Notes, the Guarantor Subsidiaries and the Non-Guarantor Subsidiaries is as follows (in millions):
	CONDENSED CONSOLIDATING BALANCE SHEET
	AS OF DECEMBER 31, 2013
	(in millions)
		Issuer			Guarantor
		ON Semiconductor			SCI LLC			Other			Non-Guarantor			Eliminations			Total
		Corporation						Subsidiaries			Subsidiaries
	Cash and cash equivalents	$	—		$	267.9		$	—		$	241.6		$	—		$	509.5
	Short-term investments	—			116.2			—			—			—			116.2
	Receivables, net	—			49.8			—			333.6			—			383.4
	Inventories	—			46.7			—			562.1			3			611.8
	Short-term intercompany receivables	—			—			4.1			7.6			(11.7		)	—
	Other current assets	—			17.8			—			71.5			—			89.3
	Total current assets	—			498.4			4.1			1,216.40			(8.7		)	1,710.20
	Property, plant and equipment, net	—			252.3			3.1			820.6			(1.8		)	1,074.20
	Goodwill	—			111.5			37.3			35.8			—			184.6
	Intangible assets, net	—			113			—			132.2			(21.8		)	223.4
	Long-term intercompany receivables	—			—			—			3.3			(3.3		)	—
	Other assets	1,790.20			1,600.60			136.1			837.3			(4,299.6		)	64.6
	Total assets	$	1,790.20		$	2,575.80		$	180.6		$	3,045.60		$	(4,335.2	)	$	3,257.00
	Accounts payable	$	—		$	39.1		$	0.5		$	237.2		$	—		$	276.8
	Accrued expenses	1			50.8			0.2			168.3			—			220.3
	Deferred income on sales to distributors	—			32.3			—			108.2			—			140.5
	Current portion of long-term debt	—			79.3			—			102.3			—			181.6
	Short-term intercompany payables	—			11.7			—			—			(11.7		)	—
	Total current liabilities	1			213.2			0.7			616			(11.7		)	819.2
	Long-term debt	335.2			396.1			—			29.3			—			760.6
	Other long-term liabilities	—			42.2			0.1			148.1			—			190.4
	Long-term intercompany payables	—			3.3			—			—			(3.3		)	—
	Total liabilities	336.2			654.8			0.8			793.4			(15.0		)	1,770.20
	Common stock	5.2			0.3			50.9			201.6			(252.8		)	5.2
	Additional paid-in capital	3,210.80			2,335.10			259.8			1,402.60			(3,997.5		)	3,210.80
	Accumulated other comprehensive loss	(47.4		)	(49.2		)	—			(38.6		)	87.8			(47.4		)
	Accumulated deficit	(1,142.1		)	(365.2		)	(130.9		)	686.6			(190.5		)	(1,142.1		)
	Less: treasury stock, at cost	(572.5		)	—			—			—			—			(572.5		)
	Total ON Semiconductor Corporation stockholders’ equity	1,454.00			1,921.00			179.8			2,252.20			(4,353.0		)	1,454.00
	Non-controlling interest in consolidated subsidiary	—			—			—			—			32.8			32.8
	Total equity	1,454.00			1,921.00			179.8			2,252.20			(4,320.2		)	1,486.80
	Total liabilities and equity	$	1,790.20		$	2,575.80		$	180.6		$	3,045.60		$	(4,335.2	)	$	3,257.00
	CONDENSED CONSOLIDATING BALANCE SHEET
	AS OF DECEMBER 31, 2012
	(in millions)
		Issuer			Guarantor
		ON Semiconductor			SCI LLC			Other			Non-Guarantor			Eliminations			Total
		Corporation						Subsidiaries			Subsidiaries
	Cash and cash equivalents	$	—		$	212.1		$	—		$	274.8		$	—		$	486.9
	Short-term investments	—			144.8			—			—			—			144.8
	Receivables, net	—			45.4			—			312.4			—			357.8
	Inventories	—			34.5			—			578.4			(31.2		)	581.7
	Short-term intercompany receivables	—			—			3.3			17.2			(20.5		)	—
	Other current assets	—			12.9			—			109.3			—			122.2
	Total current assets	—			449.7			3.3			1,292.10			(51.7		)	1,693.40
	Property, plant and equipment, net	—			272			2.8			830.9			(2.4		)	1,103.30
	Goodwill	—			111.7			37.2			35.7			—			184.6
	Intangible assets, net	—			128.2			—			154.7			(25.9		)	257
	Long-term intercompany receivables	—			166.3			—			—			(166.3		)	—
	Other assets	1,834.60			1,431.50			129.5			846.2			(4,151.7		)	90.1
	Total assets	$	1,834.60		$	2,559.40		$	172.8		$	3,159.60		$	(4,398.0	)	$	3,328.40
	Accounts payable	$	—		$	24.1		$	—		$	255.4		$	—		$	279.5
	Accrued expenses	0.5			53			0.9			177.8			24.5			256.7
	Deferred income on sales to distributors	—			34.2			—			100.3			—			134.5
	Current portion of long-term debt	198.9			80.2			0.1			74.4			—			353.6
	Short-term intercompany payables	—			20.4			—			0.1			(20.5		)	—
Total current liabilities	199.4			211.9			1			608			4			1,024.30
Long-term debt	274.1			344.1			—			40.1			—			658.3
Other long-term liabilities	—			29.9			0.3			224.9			—			255.1
Long-term intercompany payables	—			—			—			166.3			(166.3		)	—
Total liabilities	473.5			585.9			1.3			1,039.30			(162.3		)	1,937.70
Common stock	5.1			0.3			50.9			201.6			(252.8		)	5.1
Additional paid-in capital	3,156.40			2,549.30			259.2			1,402.90			(4,211.4		)	3,156.40
Accumulated other comprehensive loss	(41.1		)	(41.0		)	—			(34.6		)	75.6			(41.1		)
Accumulated deficit	(1,292.9		)	(535.1		)	(138.6		)	550.4			123.3			(1,292.9		)
Less: treasury stock, at cost	(466.4		)	—			—			—			—			(466.4		)
Total ON Semiconductor Corporation stockholders’ equity	1,361.10			1,973.50			171.5			2,120.30			(4,265.3		)	1,361.10
Non-controlling interest in consolidated subsidiary	—			—			—			—			29.6			29.6
Total equity	1,361.10			1,973.50			171.5			2,120.30			(4,235.7		)	1,390.70
Total liabilities and equity	$	1,834.60		$	2,559.40		$	172.8		$	3,159.60		$	(4,398.0	)	$	3,328.40
Notes to Consolidated Statement of Operations and Comprehensive Income	'
	CONDENSED CONSOLIDATING STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME
	FOR THE YEAR ENDED DECEMBER 31, 2013
	(in millions)
		Issuer			Guarantor
					Subsidiaries
		ON Semiconductor			SCI LLC			Other			Non-Guarantor			Eliminations			Total
		Corporation						Subsidiaries			Subsidiaries
	Revenues	$	—		$	684.2		$	13.8		$	4,142.30		$	(2,057.6	)	$	2,782.70
	Cost of revenues	—			516.4			0.6			3,419.10			(2,091.8		)	1,844.30
	Gross profit	—			167.8			13.2			723.2			34.2			938.4
	Operating expenses:
	Research and development	—			77.2			10.9			246.1			—			334.2
	Selling and marketing	—			71.4			0.7			99.1			—			171.2
	General and administrative	—			32.6			0.8			115.1			—			148.5
	Amortization of acquisition-related intangible assets	—			15.2			—			22.1			(4.2		)	33.1
	Restructuring, asset impairments and other, net	—			1.2			—			32			—			33.2
	Total operating expenses	—			197.6			12.4			514.4			(4.2		)	720.2
	Operating income (loss)	—			(29.8		)	0.8			208.8			38.4			218.2
	Other income (expenses), net:
	Interest expense	(23.0		)	(10.5		)	—			(5.1		)	—			(38.6		)
	Interest income	—			0.4			—			0.9			—			1.3
	Other	—			(11.5		)	—			14.6			—			3.1
	Loss on debt repurchase or exchange	(3.1		)	—			—			—			—			(3.1		)
	Equity in earnings	176.9			232.6			7.4			—			(416.9		)	—
	Other income (expenses), net	150.8			211			7.4			10.4			(416.9		)	(37.3		)
	Income before income taxes	150.8			181.2			8.2			219.2			(378.5		)	180.9
	Income tax provision	—			(11.4		)	—			(15.5		)	—			(26.9		)
	Net income	150.8			169.8			8.2			203.7			(378.5		)	154
	Net income attributable to non-controlling interest	—			—			—			—			(3.2		)	(3.2		)
	Net income attributable to ON Semiconductor Corporation	$	150.8		$	169.8		$	8.2		$	203.7		$	(381.7	)	$	150.8
	Comprehensive income attributed to ON Semiconductor Corporation	$	144.5		$	161.4		$	8.2		$	200.1		$	(369.7	)	$	144.5
	CONDENSED CONSOLIDATING STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME
	FOR THE YEAR ENDED DECEMBER 31, 2012
	(in millions)
		Issuers			Guarantor
					Subsidiaries
		ON Semiconductor			SCI LLC			Other			Non-Guarantor			Eliminations			Total
		Corporation						Subsidiaries			Subsidiaries
	Revenues	$	—		$	732.2		$	12.9		$	3,760.90		$	(1,611.1	)	$	2,894.90
	Cost of revenues	—			468.1			0.6			3,052.30			(1,578.0		)	1,943.00
	Gross profit	—			264.1			12.3			708.6			(33.1		)	951.9
	Operating expenses:
	Research and development	—			180.3			10.3			176.9			—			367.5
	Selling and marketing	—			68.2			0.8			111.9			—			180.9
	General and administrative	—			5			0.6			155			—			160.6
	Amortization of acquisition related intangible assets	—			18.1			—			30.5			(4.2		)	44.4
	Restructuring, asset impairments and other, net	—			3.3			0.1			161.9			—			165.3
	Goodwill and intangible asset impairment	—			20.1			—			29.4			—			49.5
	Total operating expenses	—			295			11.8			665.6			(4.2		)	968.2
	Operating income (loss)	—			(30.9		)	0.5			43			(28.9		)	(16.3		)
	Other income (expenses), net:
	Interest expense	(38.0		)	(9.0		)	—			(9.1		)	—			(56.1		)
	Interest income	—			0.8			—			0.7			—			1.5
	Other	—			11.7			—			(5.9		)	—			5.8
	Loss on debt repurchase or exchange	(7.8		)	—			—			—			—			(7.8		)
	Equity in earnings	(44.8		)	(25.6		)	10			—			60.4			—
	Other income (expenses), net	(90.6		)	(22.1		)	10			(14.3		)	60.4			(56.6		)
	Income (loss) before income taxes	(90.6		)	(53.0		)	10.5			28.7			31.5			(72.9		)
	Income tax provision	—			(1.8		)	—			(11.6		)	—			(13.4		)
	Net income (loss)	(90.6		)	(54.8		)	10.5			17.1			31.5			(86.3		)
	Net income attributable to non-controlling interest	—			—			—			—			(4.3		)	(4.3		)
	Net income (loss) attributable to ON Semiconductor Corporation	$	(90.6	)	$	(54.8	)	$	10.5		$	17.1		$	27.2		$	(90.6	)
	Comprehensive income (loss) attributed to ON Semiconductor Corporation	$	(85.0	)	$	(49.2	)	$	10.5		$	21.4		$	17.3		$	(85.0	)
CONDENSED CONSOLIDATING STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME
FOR THE YEAR ENDED DECEMBER 31, 2011
(in millions)
	Issuers			Guarantor
				Subsidiaries
	ON Semiconductor			SCI LLC			Other			Non-Guarantor			Eliminations			Total
	Corporation						Subsidiaries			Subsidiaries
Revenues	$	—		$	788.9		$	13.9		$	3,985.70		$	(1,346.2	)	$	3,442.30
Cost of revenues	—			531.5			0.8			3,236.40			(1,335.2		)	2,433.50
Gross profit	—			257.4			13.1			749.3			(11.0		)	1,008.80
Operating Expenses:
Research and development	—			167.6			10.7			184.2			—			362.5
Selling and marketing	—			70.4			1			123.7			—			195.1
General and administrative	—			84			0.7			107.7			—			192.4
Amortization of acquisition related intangible assets	—			18			—			28.8			(4.1		)	42.7
Restructuring, asset impairments and other, net	—			3.4			—			99.3			—			102.7
Total operating expenses	—			343.4			12.4			543.7			(4.1		)	895.4
Operating income (loss)	—			(86.0		)	0.7			205.6			(6.9		)	113.4
Other income (expenses), net:
Interest expense	(50.8		)	(8.5		)	—			(9.6		)	—			(68.9		)
Interest income	—			0.4			—			0.7			—			1.1
Other	—			(3.1		)	—			(5.8		)	—			(8.9		)
Loss on debt repurchase or exchange	(23.2		)	—			—			—			—			(23.2		)
Gain on System Solutions Semiconductor acquisition	(0.1		)	24.4			—			—			—			24.3
Equity in earnings	85.7			151.6			7.7			—			(245.0		)	—
Other income (expenses), net	11.6			164.8			7.7			(14.7		)	(245.0		)	(75.6		)
Income before income taxes	11.6			78.8			8.4			190.9			(251.9		)	37.8
Income tax benefit (provision)	—			1.5			—			(24.4		)	—			(22.9		)
Net income	11.6			80.3			8.4			166.5			(251.9		)	14.9
Net income attributable to non-controlling interest	—			—			—			—			(3.3		)	(3.3		)
Net income attributable to ON Semiconductor Corporation	$	11.6		$	80.3		$	8.4		$	166.5		$	(255.2	)	$	11.6
Comprehensive income attributable to ON Semiconductor Corporation	$	24		$	92.6		$	8.4		$	178.9		$	(279.9	)	$	24
Notes to Consolidated Statement of Cash Flow	'
	CONDENSED CONSOLIDATING STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME
	FOR THE YEAR ENDED DECEMBER 31, 2013
	(in millions)
		Issuer			Guarantor
					Subsidiaries
		ON Semiconductor			SCI LLC			Other			Non-Guarantor			Eliminations			Total
		Corporation						Subsidiaries			Subsidiaries
	Revenues	$	—		$	684.2		$	13.8		$	4,142.30		$	(2,057.6	)	$	2,782.70
	Cost of revenues	—			516.4			0.6			3,419.10			(2,091.8		)	1,844.30
	Gross profit	—			167.8			13.2			723.2			34.2			938.4
	Operating expenses:
	Research and development	—			77.2			10.9			246.1			—			334.2
	Selling and marketing	—			71.4			0.7			99.1			—			171.2
	General and administrative	—			32.6			0.8			115.1			—			148.5
	Amortization of acquisition-related intangible assets	—			15.2			—			22.1			(4.2		)	33.1
	Restructuring, asset impairments and other, net	—			1.2			—			32			—			33.2
	Total operating expenses	—			197.6			12.4			514.4			(4.2		)	720.2
	Operating income (loss)	—			(29.8		)	0.8			208.8			38.4			218.2
	Other income (expenses), net:
	Interest expense	(23.0		)	(10.5		)	—			(5.1		)	—			(38.6		)
	Interest income	—			0.4			—			0.9			—			1.3
	Other	—			(11.5		)	—			14.6			—			3.1
	Loss on debt repurchase or exchange	(3.1		)	—			—			—			—			(3.1		)
	Equity in earnings	176.9			232.6			7.4			—			(416.9		)	—
	Other income (expenses), net	150.8			211			7.4			10.4			(416.9		)	(37.3		)
	Income before income taxes	150.8			181.2			8.2			219.2			(378.5		)	180.9
	Income tax provision	—			(11.4		)	—			(15.5		)	—			(26.9		)
	Net income	150.8			169.8			8.2			203.7			(378.5		)	154
	Net income attributable to non-controlling interest	—			—			—			—			(3.2		)	(3.2		)
	Net income attributable to ON Semiconductor Corporation	$	150.8		$	169.8		$	8.2		$	203.7		$	(381.7	)	$	150.8
	Comprehensive income attributed to ON Semiconductor Corporation	$	144.5		$	161.4		$	8.2		$	200.1		$	(369.7	)	$	144.5
	CONDENSED CONSOLIDATING STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME
	FOR THE YEAR ENDED DECEMBER 31, 2012
	(in millions)
		Issuers			Guarantor
					Subsidiaries
		ON Semiconductor			SCI LLC			Other			Non-Guarantor			Eliminations			Total
		Corporation						Subsidiaries			Subsidiaries
	Revenues	$	—		$	732.2		$	12.9		$	3,760.90		$	(1,611.1	)	$	2,894.90
	Cost of revenues	—			468.1			0.6			3,052.30			(1,578.0		)	1,943.00
	Gross profit	—			264.1			12.3			708.6			(33.1		)	951.9
	Operating expenses:
	Research and development	—			180.3			10.3			176.9			—			367.5
	Selling and marketing	—			68.2			0.8			111.9			—			180.9
	General and administrative	—			5			0.6			155			—			160.6
	Amortization of acquisition related intangible assets	—			18.1			—			30.5			(4.2		)	44.4
	Restructuring, asset impairments and other, net	—			3.3			0.1			161.9			—			165.3
	Goodwill and intangible asset impairment	—			20.1			—			29.4			—			49.5
	Total operating expenses	—			295			11.8			665.6			(4.2		)	968.2
	Operating income (loss)	—			(30.9		)	0.5			43			(28.9		)	(16.3		)
	Other income (expenses), net:
	Interest expense	(38.0		)	(9.0		)	—			(9.1		)	—			(56.1		)
	Interest income	—			0.8			—			0.7			—			1.5
	Other	—			11.7			—			(5.9		)	—			5.8
	Loss on debt repurchase or exchange	(7.8		)	—			—			—			—			(7.8		)
	Equity in earnings	(44.8		)	(25.6		)	10			—			60.4			—
	Other income (expenses), net	(90.6		)	(22.1		)	10			(14.3		)	60.4			(56.6		)
	Income (loss) before income taxes	(90.6		)	(53.0		)	10.5			28.7			31.5			(72.9		)
	Income tax provision	—			(1.8		)	—			(11.6		)	—			(13.4		)
	Net income (loss)	(90.6		)	(54.8		)	10.5			17.1			31.5			(86.3		)
	Net income attributable to non-controlling interest	—			—			—			—			(4.3		)	(4.3		)
	Net income (loss) attributable to ON Semiconductor Corporation	$	(90.6	)	$	(54.8	)	$	10.5		$	17.1		$	27.2		$	(90.6	)
	Comprehensive income (loss) attributed to ON Semiconductor Corporation	$	(85.0	)	$	(49.2	)	$	10.5		$	21.4		$	17.3		$	(85.0	)
CONDENSED CONSOLIDATING STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME
FOR THE YEAR ENDED DECEMBER 31, 2011
(in millions)
	Issuers			Guarantor
				Subsidiaries
	ON Semiconductor			SCI LLC			Other			Non-Guarantor			Eliminations			Total
	Corporation						Subsidiaries			Subsidiaries
Revenues	$	—		$	788.9		$	13.9		$	3,985.70		$	(1,346.2	)	$	3,442.30
Cost of revenues	—			531.5			0.8			3,236.40			(1,335.2		)	2,433.50
Gross profit	—			257.4			13.1			749.3			(11.0		)	1,008.80
Operating Expenses:
Research and development	—			167.6			10.7			184.2			—			362.5
Selling and marketing	—			70.4			1			123.7			—			195.1
General and administrative	—			84			0.7			107.7			—			192.4
Amortization of acquisition related intangible assets	—			18			—			28.8			(4.1		)	42.7
Restructuring, asset impairments and other, net	—			3.4			—			99.3			—			102.7
Total operating expenses	—			343.4			12.4			543.7			(4.1		)	895.4
Operating income (loss)	—			(86.0		)	0.7			205.6			(6.9		)	113.4
Other income (expenses), net:
Interest expense	(50.8		)	(8.5		)	—			(9.6		)	—			(68.9		)
Interest income	—			0.4			—			0.7			—			1.1
Other	—			(3.1		)	—			(5.8		)	—			(8.9		)
Loss on debt repurchase or exchange	(23.2		)	—			—			—			—			(23.2		)
Gain on System Solutions Semiconductor acquisition	(0.1		)	24.4			—			—			—			24.3
Equity in earnings	85.7			151.6			7.7			—			(245.0		)	—
Other income (expenses), net	11.6			164.8			7.7			(14.7		)	(245.0		)	(75.6		)
Income before income taxes	11.6			78.8			8.4			190.9			(251.9		)	37.8
Income tax benefit (provision)	—			1.5			—			(24.4		)	—			(22.9		)
Net income	11.6			80.3			8.4			166.5			(251.9		)	14.9
Net income attributable to non-controlling interest	—			—			—			—			(3.3		)	(3.3		)
Net income attributable to ON Semiconductor Corporation	$	11.6		$	80.3		$	8.4		$	166.5		$	(255.2	)	$	11.6
Comprehensive income attributable to ON Semiconductor Corporation	$	24		$	92.6		$	8.4		$	178.9		$	(279.9	)	$	24
CONDENSED CONSOLIDATING STATEMENT CASH FLOWS
FOR THE YEAR ENDED DECEMBER 31, 2013
(in millions)
	Issuer			Guarantor
				Subsidiaries
	ON Semiconductor			SCI LLC			Other			Non-Guarantor			Eliminations			Total
	Corporation						Subsidiaries			Subsidiaries
Net cash provided by operating activities	$	—		$	63.9		$	0.2		$	274.5		$	(11.3	)	$	327.3
Cash flows from investing activities:
Purchases of property, plant and equipment	—			(32.4		)	(0.2		)	(122.6		)	—			(155.2		)
Proceeds from sales of property, plant and equipment	—			0.1			—			9.6			—			9.7
Deposits made for purchases of property, plant and equipment	—			—			—			(1.3		)	—			(1.3		)
Proceeds from held-to maturity securities	—			224.3			—			—			—			224.3
Purchase of held-to-maturity securities	—			(195.7		)	—			—			—			(195.7		)
Contribution from subsidiaries	235.2			—			—			—			(235.2		)	—
Net cash provided by (used in) investing activities	235.2			(3.7		)	(0.2		)	(114.3		)	(235.2		)	(118.2		)
Cash flows from financing activities:
Intercompany loans	—			(812.0		)	—			812			—			—
Intercompany loan repayments to guarantor	—			981.7			—			(981.7		)	—			—
Payments to parent	—			(246.5		)	—			—			246.5			—
Proceeds from issuance of common stock under the employee stock purchase plan	8.3			—			—			—			—			8.3
Proceeds from exercise of stock options	12.1			—			—			—			—			12.1
Payments of tax withholding for restricted shares	(4.5		)	—			—			—			—			(4.5		)
Repurchase of common stock	(101.0		)	—			—			—			—			(101.0		)
Proceeds from debt issuance	—			120			—			53.7			—			173.7
Payment of capital leases obligations	—			(38.2		)	—			(3.5		)	—			(41.7		)
Repayment of long-term debt	(150.1		)	(6.2		)	—			(61.4		)	—			(217.7		)
Payments made in connection with debt refinancing	—			(3.2		)	—			—			—			(3.2		)
Net cash used in financing activities	(235.2		)	(4.4		)	—			(180.9		)	246.5			(174.0		)
Effect of exchange rate changes on cash and cash equivalents	—			—			—			(12.5		)	—			(12.5		)
Net increase (decrease) in cash and cash equivalents	—			55.8			—			(33.2		)	—			22.6
Cash and cash equivalents, beginning of period	—			212.1			—			274.8			—			486.9
Cash and cash equivalents, end of period	$	—		$	267.9		$	—		$	241.6		$	—		$	509.5
CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS
FOR THE YEAR ENDED DECEMBER 31, 2012
(in millions)
	Issuers			Guarantor
				Subsidiaries
	ON Semiconductor			SCI LLC			Other			Non-Guarantor			Eliminations			Total
	Corporation						Subsidiaries			Subsidiaries
Net cash provided by operating activities	$	—		$	45.5		$	0.9		$	242.7		$	(13.1	)	$	276
Cash flows from investing activities:
Purchases of property, plant and equipment	—			(55.0		)	(0.7		)	(200.6		)	—			(256.3		)
Proceeds from sale of property, plant and equipment	—			0.1			—			6.1			—			6.2
Deposits utilized for purchases of property, plant and equipment	—			—			—			1.4			—			1.4
Recovery from insurance on property, plant and equipment	—			—			—			11.5			—			11.5
Proceeds from held-to-maturity securities	—			377.6			—			—			—			377.6
Purchase of held-to-maturity securities	—			(273.8		)	—			—			—			(273.8		)
Contribution from subsidiaries	167.8			(7.9		)	—			—			(159.9		)	—
Net cash provided by (used in) investing activities	167.8			41			(0.7		)	(181.6		)	(159.9		)	(133.4		)
Cash flows from financing activities:
Intercompany loans	—			(524.0		)	—			524			—			—
Intercompany loan repayments	—			562			—			(562.0		)	—			—
Payments to parent	—			(180.9		)	—			7.9			173			—
Proceeds from issuance of common stock under the employee stock purchase plan	8.3			—			—			—			—			8.3
Proceeds from exercise of stock options	9.4			—			—			—			—			9.4
Payments of tax withholding for restricted shares	(9.6		)	—			—			—			—			(9.6		)
Repurchase of common stock	(55.5		)	—			—			—			—			(55.5		)
Proceeds from debt issuance	—			6.5			—			17.1			—			23.6
Payment of capital lease obligation	—			(37.4		)	—			(3.4		)	—			(40.8		)
Repayment of long-term debt	(117.8		)	(5.1		)	—			(109.6		)	—			(232.5		)
Payments made in connection with debt refinancing	(2.6		)	—			—			—			—			(2.6		)
Net cash used in financing activities	(167.8		)	(178.9		)	—			(126.0		)	173			(299.7		)
Effect of exchange rate changes on cash and cash equivalents	—			—			—			(8.9		)	—			(8.9		)
Net increase (decrease) in cash and cash equivalents	—			(92.4		)	0.2			(73.8		)	—			(166.0		)
Cash and cash equivalents, beginning of period	—			304.5			(0.2		)	348.6			—			652.9
Cash and cash equivalents, end of period	$	—		$	212.1		$	—		$	274.8		$	—		$	486.9
CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS
FOR THE YEAR ENDED DECEMBER 31, 2011
(in millions)
	Issuers			Guarantor
				Subsidiaries
	ON Semiconductor			SCI LLC			Other			Non-Guarantor			Eliminations			Total
	Corporation						Subsidiaries			Subsidiaries
Net cash provided by operating activities	$	—		$	0.4		$	—		$	558.9		$	(13.8	)	$	545.5
Cash flows from investing activities:
Purchases of property, plant and equipment	—			(69.0		)	(0.2		)	(247.2		)	—			(316.4		)
Proceeds from sales of property, plant and equipment	—			0.1			—			3.2			—			3.3
Deposits utilized for purchases of property, plant and equipment	—			—			—			0.5			—			0.5
Recovery from insurance on property, plant and equipment	—			—			—			13.3			—			13.3
Purchase of businesses, net of cash acquired	—			24.3			—			(42.2		)	—			(17.9		)
Proceeds from held-to maturity securities	—			122.2			—			—			—			122.2
Purchase of held-to-maturity securities	—			(370.8		)	—			—			—			(370.8		)
Change in restricted cash	—			142.1			—			—			—			142.1
Contribution from subsidiaries	23.9			234.5			—			—			(258.4		)	—
Net cash provided by (used in) investing activities	23.9			83.4			(0.2		)	(272.4		)	(258.4		)	(423.7		)
Cash flows from financing activities:
Intercompany loan activity	—			(289.3		)	—			289.3			—			—
Intercompany loan repayments to guarantor	—			182.2			—			(182.2		)	—			—
Payments to parent	—			(37.7		)	—			(234.5		)	272.2			—
Proceeds from issuance of common stock under the employee stock purchase plan	8.1			—			—			—			—			8.1
Proceeds from exercise of stock options	59.4			—			—			—			—			59.4
Payments of tax withholding for restricted shares	(19.3		)	—			—			—			—			(19.3		)
Proceeds from debt issuance	—			12.2			—			56.8			—			69
Payment of capital leases obligations	—			(36.4		)	—			(2.6		)	—			(39.0		)
Repayment of long-term debt	(56.2		)	(2.6		)	—			(100.7		)	—			(159.5		)
Payments made in connection with debt refinancing	(15.9		)	—			—			—			—			(15.9		)
Net cash used in financing activities	(23.9		)	(171.6		)	—			(173.9		)	272.2			(97.2		)
Effect of exchange rate changes on cash and cash equivalents	—			—			—			5			—			5
Net increase (decrease) in cash and cash equivalents	—			(87.8		)	(0.2		)	117.6			—			29.6
Cash and cash equivalents, beginning of period	—			392.3			—			231			—			623.3
Cash and cash equivalents, end of period	$	—		$	304.5		$	(0.2	)	$	348.6		$	—		$	652.9

Significant_Accounting_Policie2

Significant Accounting Policies (Narrative) (Details)	12 Months Ended
	Dec. 31, 2013
Significant Accounting Policies [Line Items]	'
Repayment period of distributor	'30 days
Standard Product Warranty, period from the date of shipment	'2 years
Repayment period of account receivable, cash discount, after the date of shipment	'10 days
Minimum [Member]	'
Significant Accounting Policies [Line Items]	'
Useful Life (in Years)	'1 year
Maximum [Member]	'
Significant Accounting Policies [Line Items]	'
Useful Life (in Years)	'18 years
Building [Member] | Minimum [Member]	'
Significant Accounting Policies [Line Items]	'
Estimated useful lives of property, plant and equipment, minimum (in years)	'30 years
Building [Member] | Maximum [Member]	'
Significant Accounting Policies [Line Items]	'
Estimated useful lives of property, plant and equipment, minimum (in years)	'50 years
Machinery and Equipment [Member] | Minimum [Member]	'
Significant Accounting Policies [Line Items]	'
Estimated useful lives of property, plant and equipment, minimum (in years)	'3 years
Machinery and Equipment [Member] | Maximum [Member]	'
Significant Accounting Policies [Line Items]	'
Estimated useful lives of property, plant and equipment, minimum (in years)	'20 years

Acquisitions_Acquisition_Of_SA

Acquisitions (Acquisition Of SANYO Semiconductor Co., Ltd.) (Details) (USD $)

12 Months Ended

0 Months Ended

12 Months Ended

0 Months Ended

12 Months Ended

0 Months Ended

12 Months Ended

In Millions, unless otherwise specified

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Jan. 02, 2011

Dec. 31, 2011

Dec. 31, 2011

Jan. 02, 2011

Dec. 31, 2011

Jan. 02, 2011

Jan. 02, 2011

Jan. 02, 2011

Jan. 02, 2011

Dec. 31, 2011

Acquisition of SANYO Semiconductor Co., LTD

Acquisition of SANYO Semiconductor Co., LTD

Acquisition of SANYO Semiconductor Co., LTD

Acquisition of SANYO Semiconductor Co., LTD

Acquisition of SANYO Semiconductor Co., LTD

Acquisition of SANYO Semiconductor Co., LTD

Acquisition of SANYO Semiconductor Co., LTD

Acquisition of SANYO Semiconductor Co., LTD

Acquisition of SANYO Semiconductor Co., LTD

Acquisition of SANYO Semiconductor Co., LTD

Withdrawal from Multiemployer Defined Benefit Plan [Member]

Estimated Fair Value Of Favorable Supply Arrangement [Member]

Estimated Fair Value Of Favorable Supply Arrangement [Domain]

Patents

Trademarks

Customer relationships

Purchase price adjustments

Purchase price adjustments

Business acquisition paid in cash

'

'

'

$142.10

'

'

'

'

'

'

'

'

'

Business acquisition price note payable

'

'

'

377.5

'

'

'

'

'

'

'

'

'

Cash acquired from acquisition

'

'

'

'

39.7

'

'

'

'

'

'

'

'

Business acquisition, initial contingent consideration

'

'

'

'

19

'

'

'

'

'

'

'

'

Purchase price

'

'

'

'

'

'

'

'

'

'

'

479.9

479.9

Acquisition related expenses

'

'

'

'

7.3

'

'

'

'

'

'

'

'

Gain on SANYO Semiconductor acquisition

0

0

24.3

'

24.3

'

'

'

'

'

'

24.3

'

Weighted average useful life, years

'

'

'

'8 years 9 months 18 days

'

'

'

'

'5 years 6 months

'3 years

'13 years

'

'

Intangible assets

'

'

'

'

'

'

'

'

27

3

25.7

'

'

Estimated fair value of favorable supply arrangement included in other current assets

'

'

'

'

'

'

80

'

'

'

'

119.7

'

Estimated Period Of Benefit For Favorable Supply Arrangement

'

'

'

'

'

'

'

'5 months

'

'

'

'

'

Amortization Of Other Current Assets From Business Acquisition After Effect Of Foreign Currency Exchange

'

'

'

'

'

'

80.4

'

'

'

'

'

'

Defined benefit pension plan, liabilities

'

'

'

'

$50.90

$144.90

'

'

'

'

'

'

'

Acquisitions_Schedule_Of_Busin

Acquisitions (Schedule Of Business Combination Purchase Price Allocation) (Details) (USD $)	12 Months Ended				0 Months Ended	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2011	Jan. 02, 2011	Dec. 31, 2011
				Acquisition of SANYO Semiconductor Co., LTD	Purchase price adjustments	Purchase price adjustments
					Acquisition of SANYO Semiconductor Co., LTD	Acquisition of SANYO Semiconductor Co., LTD
Business Acquisition [Line Items]	'	'	'	'	'	'
Cash and cash equivalents	'	'	'	'	$117.10	'
Receivables, net	'	'	'	'	242.1	'
Inventories	'	'	'	'	400.3	'
Other current assets	'	'	'	'	119.7	'
Property, plant and equipment	'	'	'	'	146.7	'
Intangible assets	'	'	'	'	55.7	'
Other non-current assets	'	'	'	'	75.4	'
Total assets acquired	'	'	'	'	1,157	'
Accounts payable	'	'	'	'	-300	'
Other current liabilities	'	'	'	'	-152	'
Long-term accrued liabilities	'	'	'	'	-200.8	'
Total liabilities assumed	'	'	'	'	-652.8	'
Net assets acquired	'	'	'	'	504.2	'
Gain on acquisition	0	0	-24.3	-24.3	-24.3	'
Purchase price	'	'	'	'	$479.90	$479.90

Acquisitions_Acquisition_Of_Th

Acquisitions (Acquisition Of The CMOS Image Sensor Business Unit From Cypress Semiconductor) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Feb. 27, 2011	Dec. 31, 2013	Feb. 27, 2011	Feb. 27, 2011	Feb. 27, 2011	Feb. 27, 2011
In Millions, unless otherwise specified				Acquisition of the CMOS Image Sensor Business Unit from Cypress Semiconductor	Acquisition of the CMOS Image Sensor Business Unit from Cypress Semiconductor	Acquisition of the CMOS Image Sensor Business Unit from Cypress Semiconductor	Acquisition of the CMOS Image Sensor Business Unit from Cypress Semiconductor	Acquisition of the CMOS Image Sensor Business Unit from Cypress Semiconductor	Acquisition of the CMOS Image Sensor Business Unit from Cypress Semiconductor
						Purchase price adjustments	Customer relationships	Developed technology	Backlog
Business Acquisition [Line Items]	'	'	'	'	'	'	'	'	'
Ownership percentage	'	'	'	100.00%	'	'	'	'	'
Purchase price	'	'	'	$34.10	'	'	'	'	'
Purchase Price Allocation of CMOS Image Sensor Business Unit [Abstract]	'	'	'	'	'	'	'	'	'
Cash and cash equivalents	'	'	'	'	'	1.5	'	'	'
Receivables, net	'	'	'	'	'	2.6	'	'	'
Inventories	'	'	'	'	'	9.2	'	'	'
Other current assets	'	'	'	'	'	0.4	'	'	'
Property, plant and equipment	'	'	'	'	'	1.2	'	'	'
Goodwill	184.6	184.6	198.7	'	'	7.5	'	'	'
Intangible assets	'	'	'	11.2	'	11.2	'	'	'
In-process research and development	'	'	'	11.2	'	11.2	'	'	'
Total assets acquired	'	'	'	'	'	44.8	'	'	'
Accounts payable	'	'	'	'	'	-5.6	'	'	'
Other current liabilities	'	'	'	'	'	-3.7	'	'	'
Long-term accrued liabilities	'	'	'	'	'	-1.4	'	'	'
Total liabilities assumed	'	'	'	'	'	-10.7	'	'	'
Net assets acquired	'	'	'	'	'	34.1	'	'	'
Discount rate used for present value calculations	'	'	'	17.50%	'	'	'	'	'
Intangible assets	'	'	'	'	'	'	4.2	6.2	0.8
Weighted average useful life, years	'	'	'	'	'	'	'6 years	'7 years	'3 months 18 days
Allocation of purchase price to non-deductible goodwill	'	'	'	$7.50	$7.50	'	'	'	'

Goodwill_And_Intangible_Assets2

Goodwill And Intangible Assets (Narrative) (Details) (USD $)	12 Months Ended					3 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012	Dec. 31, 2012	Dec. 31, 2012
				Standard Products Group [Member]	Standard Products Group [Member]	System Solutions Group [Member]
Goodwill impairment charge for digital and mixed signal group	'	'	'	'	$14,100,000	'
Goodwill impairment test discount rate	14.00%	'	14.00%	'	'	'
Goodwill impairment test long term growth rate	4.00%	'	3.90%	'	'	'
Impairment of long-lived assets	'	'	'	'	'	126,000,000
Impairment of intangible assets	40,600,000	40,600,000	'	3,800,000	'	31,600,000
Amortization of acquisition-related intangible assets	33,100,000	44,400,000	42,700,000	'	'	'
Cost of goods sold, amortization	0	0	1,100,000	'	'	'
Amortization of Intangible Assets Including Acquired Assets	'	'	$43,800,000	'	'	'

Goodwill_And_Intangible_Assets3

Goodwill And Intangible Assets (Summary Of Goodwill by Operating Segment) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
In Millions, unless otherwise specified
Goodwill [Line Items]	'	'	'
Goodwill	$623.40	$623.40	'
Accumulated Amortization	-9.8	-9.8	'
Accumulated Impairment Losses	-429	-429	'
Carrying Value	184.6	184.6	198.7
Application Products Group	'	'	'
Goodwill [Line Items]	'	'	'
Goodwill	547.4	547.4	'
Accumulated Amortization	-4.2	-4.2	'
Accumulated Impairment Losses	-406	-406	'
Carrying Value	137.2	137.2	'
Standard Products Group	'	'	'
Goodwill [Line Items]	'	'	'
Goodwill	76	76	'
Accumulated Amortization	-5.6	-5.6	'
Accumulated Impairment Losses	-23	-23	'
Carrying Value	$47.40	$47.40	'

Goodwill_And_Intangible_Assets4

Goodwill And Intangible Assets (Summary Of Change In Goodwill) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Goodwill [Roll Forward]	'	'
Net balance, beginning	$184.60	$198.70
Impairment charge	0	-14.1
Net balance, ending	$184.60	$184.60

Goodwill_And_Intangible_Assets5

Goodwill And Intangible Assets (Summary Of Intangible Assets, Net) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Original Cost	$498.10	$498.10
Accumulated Amortization	-206.7	-173.6
Foreign Currency Translation Adjustment	-27.4	-26.9
Accumulated Impairment	-40.6	-40.6
Carrying Value	223.4	257
Intellectual property	'	'
Original Cost	13.9	13.9
Accumulated Amortization	-9.4	-8.7
Foreign Currency Translation Adjustment	0	0
Accumulated Impairment	-0.4	-0.4
Carrying Value	4.1	4.8
Customer relationships	'	'
Original Cost	280.3	280.3
Accumulated Amortization	-105.5	-91.8
Foreign Currency Translation Adjustment	-27.4	-26.9
Accumulated Impairment	-23	-23
Carrying Value	124.4	138.6
Patents	'	'
Original Cost	43.7	43.7
Accumulated Amortization	-19	-16.6
Foreign Currency Translation Adjustment	0	0
Accumulated Impairment	-13.7	-13.7
Carrying Value	11	13.4
Useful Life (in Years)	'12 years	'12 years
Developed technology	'	'
Original Cost	146.2	146.2
Accumulated Amortization	-66.7	-51.3
Foreign Currency Translation Adjustment	0	0
Accumulated Impairment	-2.4	-2.4
Carrying Value	77.1	92.5
Trademarks	'	'
Original Cost	14	14
Accumulated Amortization	-6.1	-5.2
Foreign Currency Translation Adjustment	0	0
Accumulated Impairment	-1.1	-1.1
Carrying Value	$6.80	$7.70
Useful Life (in Years)	'15 years	'15 years
Minimum [Member]	'	'
Useful Life (in Years)	'1 year	'
Minimum [Member] | Intellectual property	'	'
Useful Life (in Years)	'5 years	'5 years
Minimum [Member] | Customer relationships	'	'
Useful Life (in Years)	'5 years	'5 years
Minimum [Member] | Developed technology	'	'
Useful Life (in Years)	'5 years	'5 years
Maximum [Member]	'	'
Useful Life (in Years)	'18 years	'
Maximum [Member] | Intellectual property	'	'
Useful Life (in Years)	'12 years	'12 years
Maximum [Member] | Customer relationships	'	'
Useful Life (in Years)	'18 years	'18 years
Maximum [Member] | Developed technology	'	'
Useful Life (in Years)	'12 years	'12 years

Goodwill_And_Intangible_Assets6

Goodwill And Intangible Assets (Summary Of Amortization Expense) (Details) (USD $)	Dec. 31, 2013
In Millions, unless otherwise specified
Goodwill and Intangible Assets Disclosure [Abstract]	'
2014	$32.60
2015	31.7
2016	30.6
2017	27.7
2018	24.4
Thereafter	76.4
Total estimated amortization expense	$223.40

Restructuring_Asset_Impairment2

Restructuring, Asset Impairments And Other, Net (Reconciliation Of "Restructuring, Asset Impairments And Other, Net" Caption On The Consolidated Statement Of Operations) (Details) (USD $)	12 Months Ended																	3 Months Ended	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012	Dec. 31, 2012	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2011	Dec. 31, 2011	Dec. 31, 2011
				Restructuring Activities Related To Aizu Closure [Member]	Restructuring Activities Related To Aizu Closure [Member]	Restructuring Activities Related To Aizu Closure [Member]	KSS Facility Closure [Member]	Other Restructuring [Member]		Other Restructuring [Member]		Other Restructuring [Member]		Restructuring Charges, Net [Member]	Restructuring Charges, Net [Member]	Restructuring Charges, Net [Member]	2012 global workforce reduction [Member]	System Solutions Group Asset Impairment [Member]	System Solutions Group Asset Impairment [Member]	System Solutions Group Voluntary Retirement Programs [Member]	System Solutions Group Voluntary Retirement Programs [Member]	Restructuring Activities [Member]	Restructuring Activities [Member]	Thailand facility closure [Member]	Japan earthquake and tsunami [Member]	Phoenix wafer manufacturing facility closure [Member]
Restructuring Cost and Reserve [Line Items]	'	'	'	'	'	'	'	'		'		'		'	'	'	'	'	'	'	'	'	'	'	'	'
Restructuring	'	'	'	$3.10	$9	$6.50	$6.50	$4.80	[1]	$2	[1]	$1.20	[1]	$67.30	$73.40	$27.70	$11.20	'	$0	$52.90	$47.60	$3.60	$10	$5.70	$0	$4.30
Asset impairment charges	8	103	86.3	0	4.5	61.5	3.5	4.5	[1]	4.1	[1]	0		8	103	86.3	0	94.4	94.4	0	0	0	0	24.8	0	0
Other	'	'	'	-22.4	0.1	2	0	-4.1	[1]	0.5	[1]	0.5	[1]	-42.1	-11.1	-11.3	0	'	0	-15.6	-11.7	0	0	-18.6	4.8	0
Total	$67.30	$73.40	'	($19.30)	$13.60	$70	$10	$5.20	[1]	$6.60	[1]	$1.70	[1]	$33.20	$165.30	$102.70	$11.20	'	$94.40	$37.30	$35.90	$3.60	$10	$11.90	$4.80	$4.30
[1]	Includes charges related to the certain reductions in workforce, certain acquisitions, other facility closures, asset disposal activity and certain other activity which is not considered to be significant.

Restructuring_Asset_Impairment3

Restructuring, Asset Impairments And Other, Net (Rollforward Of Accrued Restructuring Charges) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Restructuring Reserve [Roll Forward]	'	'
Balance at Beginning of Period	$17.10	$17.30
Restructuring charges	67.3	73.4
Usage	-56.6	-72.9
Adjustments	-1.6	-0.7
Balance at End of Period	26.2	17.1
Estimated Employee Separation Charges [Member]	'	'
Restructuring Reserve [Roll Forward]	'	'
Balance at Beginning of Period	15.5	8.9
Restructuring charges	62.2	67.8
Usage	-50.9	-60.7
Adjustments	-1.6	-0.5
Balance at End of Period	25.2	15.5
Estimated Costs To Exit [Member]	'	'
Restructuring Reserve [Roll Forward]	'	'
Balance at Beginning of Period	1.6	8.4
Restructuring charges	5.1	5.6
Usage	-5.7	-12.2
Adjustments	0	-0.2
Balance at End of Period	$1	$1.60

Restructuring_Asset_Impairment4

Restructuring, Asset Impairments And Other, Net (Narrative) (Details) (USD $)

12 Months Ended

12 Months Ended

3 Months Ended

12 Months Ended

3 Months Ended

12 Months Ended

0 Months Ended

12 Months Ended

0 Months Ended

12 Months Ended

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Mar. 29, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Oct. 06, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Oct. 06, 2013

Dec. 31, 2013

Voluntary Retirement [Member]

Voluntary Retirement [Member]

Voluntary Retirement [Member]

Voluntary Retirement [Member]

Voluntary Retirement [Member]

Voluntary Retirement [Member]

Voluntary Retirement [Member]

Facility Closing [Member]

Facility Closing [Member]

Facility Closing [Member]

Facility Closing [Member]

Facility Closing [Member]

Facility Closing [Member]

Facility Closing [Member]

Employee Severance [Member]

System Solutions Group Voluntary Retirement Programs [Member]

Q1 2013 Voluntary Retirement Program [Member]

Q1 2013 Voluntary Retirement Program [Member]

Q4 2013 Voluntary Retirement Program [Member]

Q4 2013 Voluntary Retirement Program [Member]

Q4 2013 Voluntary Retirement Program [Member]

Expected Costs in FY of 2014 [Member]

Aizu Plan [Member]

Aizu Plan [Member]

KSS Plan [Member]

KSS Plan [Member]

KSS Plan [Member]

KSS Plan [Member]

KSS Plan [Member]

KSS Plan [Member]

employees

employees

Contract Employee [Member]

Accumulated Translation Adjustment [Member]

employees

Minimum [Member]

Maximum [Member]

Contract Employee [Member]

employees

employees

Restructuring Cost and Reserve [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Expected number of positions to be eliminated

'

'

'

'

500

'

350

'

70

'

'

'

170

'

'

'

40

'

Restructuring charges

$67,300,000

$73,400,000

'

'

'

$35,400,000

'

$17,500,000

'

'

$86,700,000

'

'

'

'

'

'

$3,400,000

Number of employees terminated

'

'

'

'

'

'

170

'

'

'

'

'

'

'

'

'

'

'

Increase (decrease) in pension and postretirement obligations

'

'

'

-15,600,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Accrued liabilities

26,200,000

17,100,000

17,300,000

17,800,000

'

'

'

'

'

'

'

'

'

6,200,000

'

'

'

'

Reclassification from other comprehensive income, net of tax

'

'

'

'

'

'

'

'

'

'

'

21,000,000

'

'

'

'

'

'

Additional employee separation charges expected to incur

'

'

'

'

'

'

'

'

'

6,700,000

'

'

'

8,300,000

'

'

'

'

Defined Benefit Plan, Expected Net Gain (Loss) Due to Curtailments

'

'

'

'

'

'

'

4,500,000

'

'

'

'

'

2,100,000

'

'

'

'

Costs incurred associated with closure of facilities

'

'

'

'

'

'

'

'

'

'

'

'

'

'

1,000,000

2,000,000

'

'

Multiemployer Plans, Withdrawal Obligation

'

'

'

'

'

'

'

'

'

'

'

'

'

$3,100,000

'

'

'

'

Balance_Sheet_Information_Narr

Balance Sheet Information (Narrative) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Balance Sheet Related Disclosures [Abstract]	'	'	'
Depreciation expense for property, plant and equipment	$164.60	$180.80	$162.80
Assets financed under capital leases included in total property, plant and equipment	$41.80	$79.70	'

Balance_Sheet_Information_Sche

Balance Sheet Information (Schedule of Balance Sheet Information) (Details) (USD $)	Dec. 31, 2013		Dec. 31, 2012	Dec. 31, 2011
In Millions, unless otherwise specified
Receivables, net:	'		'	'
Accounts receivable	$384.40		$360.50	'
Less: Allowance for doubtful accounts	-1		-2.7	'
Accounts receivable, net	383.4		357.8	'
Inventories:	'		'	'
Raw materials	89.2		73.2	'
Work in process	319.6		310.9	'
Finished goods	203		197.6	'
Inventories, net	611.8		581.7	'
Other Current Assets:	'		'	'
Prepaid expenses	24.8		24.3	'
Value added and other income tax receivables	31.7		34.3	'
Other	32.8		63.6	'
Other current assets	89.3		122.2	'
Property, plant and equipment, net:	'		'	'
Land	52.3	[1]	67.4	'
Buildings	467.7	[1]	572.4	'
Machinery and equipment	1,918.40	[1]	1,979.40	'
Total property, plant and equipment	2,438.40	[1]	2,619.20	'
Less: Accumulated depreciation	-1,364.20	[1]	-1,515.90	'
Property, plant and equipment, net	1,074.20	[1]	1,103.30	1,109.50
Accrued expenses:	'		'	'
Accrued payroll	91.3		102.9	'
Sales related reserves	54.2		64.9	'
Restructuring reserves	26.2		17.1	17.3
Accrued pension liability	10.4		7.4	'
Accrued interest	1.9		0.6	'
Other	36.3		63.8	'
Accrued Liabilities, Current, Total	220.3		256.7	'
Property, plant and equipment long lived	$8.70		'	'
[1]	Included in property, plant and equipment are $8.7 million of fixed assets that are held-for-sale as of December 31, 2013.

Balance_Sheet_Information_Warr

Balance Sheet Information (Warranty Reserves) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Warranty Reserves [Roll Forward]	'	'	'
Beginning Balance	$10.20	$5.80	$3.30
Provision	4.4	8.1	4
Usage	-8.6	-3.7	-1.5
Ending Balance	$6	$10.20	$5.80

LongTerm_Debt_LongTerm_Debt_De

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

12 Months Ended

0 Months Ended

In Millions, unless otherwise specified

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 20, 2013

Mar. 22, 2013

Dec. 31, 2012

Sep. 04, 2012

Dec. 15, 2011

Dec. 15, 2006

Dec. 31, 2013

Dec. 31, 2012

Dec. 15, 2006

Dec. 19, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 21, 2005

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Senior Revolving Credit Facility [Member]

Senior Revolving Credit Facility [Member]

Loan with Japanese bank due 2014 through 2018, interest payable quarterly at 2.00% and 2.06%, respectively [Member]

Loan with Japanese bank due 2014 through 2018, interest payable quarterly at 2.00% and 2.06%, respectively [Member]

2.625% Convertible Senior Subordinated Notes [Member]

2.625% Convertible Senior Subordinated Notes [Member]

2.625% Convertible Senior Subordinated Notes [Member]

2.625% Convertible Senior Subordinated Notes [Member]

2.625% Convertible Senior Subordinated Notes [Member]

2.625% Convertible Senior Subordinated Notes [Member]

2.625% Convertible Senior Subordinated Notes [Member]

2.625% Notes, Series B (net of discount of $21.7 million and $24.2 million, respectively) [Member]

2.625% Notes, Series B (net of discount of $21.7 million and $24.2 million, respectively) [Member]

2.625% Notes, Series B (net of discount of $21.7 million and $24.2 million, respectively) [Member]

1.875% Notes [Member]

1.875% Notes [Member]

1.875% Notes [Member]

1.875% Notes [Member]

Loan with Hong Kong bank, interest payable weekly at 1.91% and 1.96%, respectively [Member]

Loan with Hong Kong bank, interest payable weekly at 1.91% and 1.96%, respectively [Member]

Loans with Philippine banks due 2014 through 2015, interest payable monthly and quarterly at an average rate of 2.16% and 1.97%, respectively [Member]

Loans with Philippine banks due 2014 through 2015, interest payable monthly and quarterly at an average rate of 2.16% and 1.97%, respectively [Member]

Loan with Chinese bank due 2014, interest payable quarterly at 3.34% and 3.41%, respectively [Member]

Loan with Chinese bank due 2014, interest payable quarterly at 3.34% and 3.41%, respectively [Member]

Loan with Japanese bank due 2013, interest payable monthly at 0.00% and 1.58%, respectively [Member]

Loan with Japanese bank due 2013, interest payable monthly at 0.00% and 1.58%, respectively [Member]

Loan with Singapore bank, interest payable weekly at 1.94% and 1.95%, respectively [Member]

Loan with Singapore bank, interest payable weekly at 1.94% and 1.95%, respectively [Member]

Loan with British finance company, interest payable monthly at 1.57% and 1.51%, respectively [Member]

Loan with British finance company, interest payable monthly at 1.57% and 1.51%, respectively [Member]

U.S. real estate mortgages payable monthly through 2016 at an average rate of 4.86% [Member]

U.S. real estate mortgages payable monthly through 2016 at an average rate of 4.86% [Member]

U.S. equipment financing payable monthly through 2016 at 2.94% [Member]

U.S. equipment financing payable monthly through 2016 at 2.94% [Member]

Canada equipment financing payable monthly through 2017 at 3.81% [Member]

Canada equipment financing payable monthly through 2017 at 3.81% [Member]

Canada revolving line of credit, interest payable quarterly at 1.84% [Member]

Canada revolving line of credit, interest payable quarterly at 1.84% [Member]

Capital lease obligations [Member]

Capital lease obligations [Member]

Debt Instrument [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Long-term debt, including current maturities

$942.20

$1,011.90

$120

$0

$273.70

[1]

$302

[1]

$0

[2]

$72.60

'

$125.50

[2]

'

'

'

$335.20

[3]

$274.20

[3]

'

$73.40

[4]

$0

[5]

$73.40

[5]

'

$40

[6]

$30

[6]

$39.20

[7]

$45.80

[7]

$7

[8]

$7

[8]

$0

[8]

$0.80

[8]

$15

[6]

$15

[6]

$0.20

[6]

$3.30

[6]

$28.10

[9]

$29.80

[9]

$9.50

[4]

$14

[4]

$5.90

[4]

$0

[4]

$15

[8]

$0

[8]

$53.40

$91.10

Less: Current maturities

-181.6

-353.6

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Long-term debt

760.6

658.3

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Debt instrument, interest rate

'

'

2.00%

0.00%

2.00%

2.06%

2.63%

2.63%

[2]

'

2.63%

'

'

2.63%

2.63%

2.63%

2.63%

'

1.88%

1.88%

1.88%

1.91%

1.96%

'

'

3.34%

3.41%

0.00%

1.58%

1.94%

1.95%

1.57%

1.51%

'

'

2.94%

2.94%

3.81%

3.81%

1.84%

1.84%

'

'

Long-term Debt, Weighted Average Interest Rate

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

2.16%

1.97%

'

'

'

'

'

'

'

'

4.86%

4.86%

'

'

'

'

'

'

'

'

Debt instrument, discount

'

'

'

'

'

'

0

'

0.1

[10]

7.1

0.6

[10]

1.4

[10]

'

21.7

24.2

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Consecutive trading days included in calculation of conversion obligation

'20 days

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'20 days

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Unsecured debt

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

15

[8]

7.5

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Secured debt

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$24.20

[8]

$38.30

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

[1]

This loan represents SCI LLC's unsecured loan with SMBC, which is guaranteed by the Company. See additional information below under the heading "Note Payable to SMBC."

[2]

The 2.625% Notes were redeemed by the Company on December 20, 2013.

[3]

The 2.625% Notes, Series B may be put back to the Company at the option of the holders of the notes on December 15 of 2016 and 2021 or called at the option of the Company on or after December 20, 2016.

[4]

Debt arrangement secured by equipment.

[5]

The 1.875% Notes were partially redeemed by the Company on December 20, 2012. The balance as of December 31, 2012 for notes submitted for conversion was subject to a 20 consecutive trading-day observation period and was subsequently settled during January 2013.

[6]

Debt arrangement secured by accounts receivable.

[7]

$15.0 million unsecured and $24.2 million secured by equipment and $7.5 million unsecured and $38.3 million secured by equipment, respectively.

[8]

Unsecured debt arrangement.

[9]

Debt arrangement secured by real estate.

[10]

Represents exchange expenses capitalized as debt issuance costs that are amortized using the effective interest method through the first put date of December 15, 2016.

LongTerm_Debt_Annual_Maturitie

Long-Term Debt (Annual Maturities Relating To Long-Term Debt) (Details) (USD $)	Dec. 31, 2013
In Millions, unless otherwise specified
Debt Disclosure [Abstract]	'
2014	$181.60
2015	74
2016	424.9
2017	39
2018	243.5
Thereafter	0.9
Total	$963.90

LongTerm_Debt_LongTerm_Debt_Re

Long-Term Debt Long-Term Debt (Redemption, Conversion, and Retirement of Debt) (Details) (USD $)

12 Months Ended

0 Months Ended

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Jan. 28, 2013

Dec. 19, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 20, 2012

Dec. 21, 2005

Dec. 31, 2013

Dec. 31, 2012

1.875% Notes [Member]

1.875% Notes [Member]

1.875% Notes [Member]

1.875% Notes [Member]

1.875% Notes [Member]

1.875% Notes [Member]

Senior Revolving Credit Facility [Member]

Senior Revolving Credit Facility [Member]

Debt Instrument [Line Items]

'

'

'

'

'

'

'

'

'

'

'

Net carrying value

$942,200,000

$1,011,900,000

'

'

$73,400,000

[1]

$0

[2]

$73,400,000

[2]

'

'

$120,000,000

$0

Debt instrument, interest rate

'

'

'

'

'

1.88%

1.88%

'

1.88%

2.00%

0.00%

(Loss) gain on debt repurchase

-3,100,000

-7,800,000

-23,200,000

'

'

'

'

'

'

'

'

Rate of conversion

'

'

'

'

142.8571

'

'

'

'

'

'

Principal amount of original debt converted

'

'

'

'

1,000

'

'

'

'

'

'

Consecutive trading days included in calculation of conversion obligation

'20 days

'

'

'

'20 days

'

'

'

'

'

'

Outstanding aggregate principal redeemed

'

'

'

'

'

'

'

21,600,000

[1]

'

'

'

Cash paid upon conversion

'

'

'

77,500,000

[1]

'

'

'

'

'

'

'

Cash paid upon conversion in excess of aggregate principal amount

'

'

'

$4,100,000

[1]

'

'

'

'

'

'

'

[1]

Debt arrangement secured by equipment.

[2]

The 1.875% Notes were partially redeemed by the Company on December 20, 2012. The balance as of December 31, 2012 for notes submitted for conversion was subject to a 20 consecutive trading-day observation period and was subsequently settled during January 2013.

LongTerm_Debt_Loss_on_Debt_Rep

Long-Term Debt (Loss on Debt Repurchase or Exchange) (Details) (USD $)

12 Months Ended

12 Months Ended

0 Months Ended

12 Months Ended

0 Months Ended

0 Months Ended

0 Months Ended

12 Months Ended

12 Months Ended

In Millions, unless otherwise specified

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Dec. 20, 2013

Dec. 31, 2012

Dec. 15, 2006

Dec. 31, 2011

Dec. 15, 2006

Dec. 31, 2013

Dec. 31, 2012

Mar. 22, 2013

Sep. 04, 2012

Dec. 15, 2011

Dec. 31, 2013

Dec. 31, 2012

Dec. 15, 2006

Mar. 22, 2013

Mar. 22, 2013

Dec. 15, 2006

Mar. 22, 2013

Sep. 04, 2012

Dec. 15, 2011

Mar. 22, 2013

Sep. 04, 2012

Dec. 15, 2011

Sep. 04, 2012

Dec. 15, 2006

Sep. 04, 2012

Dec. 31, 2011

Dec. 31, 2011

Dec. 15, 2006

Dec. 31, 2011

2.625% Convertible Senior Subordinated Notes [Member]

2.625% Convertible Senior Subordinated Notes [Member]

2.625% Convertible Senior Subordinated Notes [Member]

2.625% Convertible Senior Subordinated Notes [Member]

2.625% Convertible Senior Subordinated Notes [Member]

2.625% Convertible Senior Subordinated Notes [Member]

Senior Revolving Credit Facility [Member]

Senior Revolving Credit Facility [Member]

2.625% Notes, Series B (net of discount of $21.7 million and $24.2 million, respectively) [Member]

2.625% Notes, Series B (net of discount of $21.7 million and $24.2 million, respectively) [Member]

2.625% Notes, Series B (net of discount of $21.7 million and $24.2 million, respectively) [Member]

2.625% Notes, Series B (net of discount of $21.7 million and $24.2 million, respectively) [Member]

2.625% Notes, Series B (net of discount of $21.7 million and $24.2 million, respectively) [Member]

2.625% Notes, Series B (net of discount of $21.7 million and $24.2 million, respectively) [Member]

Debt Exchange - 2013 [Member]

Debt Exchange - 2013 [Member]

Debt Exchange - 2013 [Member]

Debt Exchange [Member]

Debt Exchange [Member]

Debt Exchange [Member]

Debt Exchange [Member]

Debt Exchange [Member]

Debt Exchange [Member]

Debt Exchange - 2012 [Member]

Debt Exchange - 2012 [Member]

Debt Exchange - 2012 [Member]

Debt Exchange - 2011 [Member]

Debt Exchange - 2011 [Member]

Debt Exchange - 2011 [Member]

Debt Exchange - 2011 [Member]

Debt Repurchase [Member]

Debt Repurchase [Member]

2.625% Convertible Senior Subordinated Notes [Member]

2.625% Notes, Series B (net of discount of $21.7 million and $24.2 million, respectively) [Member]

2.625% Notes, Series B (net of discount of $21.7 million and $24.2 million, respectively) [Member]

2.625% Convertible Senior Subordinated Notes [Member]

2.625% Convertible Senior Subordinated Notes [Member]

2.625% Convertible Senior Subordinated Notes [Member]

2.625% Notes, Series B (net of discount of $21.7 million and $24.2 million, respectively) [Member]

2.625% Notes, Series B (net of discount of $21.7 million and $24.2 million, respectively) [Member]

2.625% Notes, Series B (net of discount of $21.7 million and $24.2 million, respectively) [Member]

2.625% Convertible Senior Subordinated Notes [Member]

2.625% Convertible Senior Subordinated Notes [Member]

2.625% Notes, Series B (net of discount of $21.7 million and $24.2 million, respectively) [Member]

2.625% Convertible Senior Subordinated Notes [Member]

2.625% Convertible Senior Subordinated Notes [Member]

2.625% Notes, Series B (net of discount of $21.7 million and $24.2 million, respectively) [Member]

Debt Instrument [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

(Loss) gain on debt repurchase

($3.10)

($7.80)

($23.20)

'

'

'

'

($5.30)

'

'

'

'

'

'

'

'

'

($3.10)

'

'

'

'

'

'

'

'

($7.80)

'

'

'

'

'

'

Par value of debt exchanged

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

60

99.9

198.6

58.5

99.9

198.6

99.9

'

99.9

'

198.6

'

198.6

Net carrying value

942.2

1,011.90

'

0

[1]

72.6

125.5

[1]

'

46.6

'

120

0

'

'

'

335.2

[2]

274.2

[2]

'

57.4

'

'

'

'

'

'

'

'

92.8

'

'

'

177.2

'

176.4

Debt instrument, interest rate

'

'

'

2.63%

2.63%

[1]

2.63%

2.63%

'

2.63%

2.00%

0.00%

'

'

'

2.63%

2.63%

2.63%

'

'

2.63%

'

'

'

'

'

'

2.63%

2.63%

'

'

2.63%

2.63%

2.63%

Write off of unamortized debt issuance costs

'

'

'

'

'

'

'

0.5

'

'

'

'

'

'

1.3

'

'

'

0.2

'

'

'

'

'

'

'

'

'

0.6

'

'

'

1.7

Adjustments to additional paid in capital for reacquisition of equity component

'

'

'

'

'

'

'

4.8

'

'

'

'

'

'

'

'

'

'

5.9

'

'

'

'

'

'

'

'

'

1.9

'

'

'

21

Cash paid on repurchase of senior notes

'

'

'

'

'

'

'

56.2

'

'

'

0

2

15.9

'

'

'

'

'

'

'

'

'

'

'

'

'

'

2

'

'

'

15.9

Principal amount of debt

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

198.6

Gain (Loss) on Repurchase of Debt Instrument

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

-17.9

'

'

'

Par value of debt repurchased

'

'

'

'

'

'

'

$53

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

[1]

The 2.625% Notes were redeemed by the Company on December 20, 2013.

[2]

The 2.625% Notes, Series B may be put back to the Company at the option of the holders of the notes on December 15 of 2016 and 2021 or called at the option of the Company on or after December 20, 2016.

LongTerm_Debt_LongTerm_Debt_No

Long-Term Debt Long-Term Debt (Notes Payable to SMBC) (Details) (USD $)	1 Months Ended	12 Months Ended
In Millions, unless otherwise specified	Jan. 31, 2011	Dec. 31, 2013	Dec. 31, 2012
Servicing Assets at Fair Value [Line Items]	'	'	'
Net carrying value	'	$942.20	$1,011.90
SANYO Electric [Member]	'	'	'
Servicing Assets at Fair Value [Line Items]	'	'	'
Basis spread on variable rate	'	1.75%	'
Period of debt, in years	'7 years	'	'
Principal amount of debt	377.5	'	'
Net carrying value	'	273.7	302
Debt Instrument, Interest Rate Terms	'	'3-month LIBOR plus 1.75% per annum	'
Principal payment of loan, quarterly	'	9.4	'
Remaining balance of loan due in January 2018	'	$122.70	'

LongTerm_Debt_Amended_and_Rest

Long-Term Debt (Amended and Restated Senior Revolving Credit Facility) (Details) (Senior Revolving Credit Facility [Member], USD $)	3 Months Ended		12 Months Ended		3 Months Ended	0 Months Ended
	Dec. 31, 2013	Dec. 31, 2013	Dec. 31, 2013	Oct. 10, 2013	Dec. 31, 2013	Oct. 10, 2013	Dec. 31, 2013	Oct. 10, 2013	Oct. 10, 2013
					Revolving Credit Facility [Member]	Letter of Credit [Member]	Letter of Credit [Member]	Swingline Loans For Short-Term Borrowings [Member]	Foreign Currency Sublimit [Member]
Debt Instrument [Line Items]	'	'	'	'	'	'	'	'	'
Credit facility, maximum borrowing capacity	'	'	'	$800,000,000	'	$40,000,000	'	$15,000,000	$75,000,000
Period of debt, in years	'	'	'	'	'5 years	'	'	'	'
Ability to increase the size of the facility, in increments	'	120,000,000	'	'	'	10,000,000	'	'	'
Line of Credit, Increase, Additional Borrowings, Maximum	'	'	'	250,000,000	'	'	'	'	'
Credit agreement financial covenants, maximum total leverage ratio	'	'	3.75	'	'	'	'	'	'
Credit agreement financial covenants, minimum interest coverage ratio	'	'	3.5	'	'	'	'	'	'
Credit commitment outstanding	'	'	'	'	'	'	200,000	'	'
Debt issuance costs included in other assets	3,200,000	3,200,000	3,200,000	'	'	'	'	'	'
Debt Issuance Cost	$4,400,000	'	'	'	'	'	'	'	'

LongTerm_Debt_Description_of_t

Long-Term Debt (Description of the 2.625% Notes) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 20, 2013		Mar. 22, 2013		Dec. 31, 2012	Sep. 04, 2012		Dec. 15, 2011		Dec. 15, 2006
2.625% Notes, Series B (net of discount of $21.7 million and $24.2 million, respectively) [Member]	'	'		'		'	'		'		'
Debt Instrument [Line Items]	'	'		'		'	'		'		'
Debt instrument, interest rate	2.63%	'		'		2.63%	'		'		2.63%
Debt instrument, discount	$21,700,000	'		'		$24,200,000	'		'		'
Write-off of unamortized debt issuance costs	1,300,000	'		'		'	'		'		'
2.625% Convertible Senior Subordinated Notes [Member]	'	'		'		'	'		'		'
Debt Instrument [Line Items]	'	'		'		'	'		'		'
Debt instrument, interest rate	2.63%	2.63%	[1]	'		2.63%	'		'		2.63%
Debt instrument, discount	0	'		100,000	[2]	7,100,000	600,000	[2]	1,400,000	[2]	'
Debt Instrument, Convertible, Conversion Ratio	95.2381	'		'		'	'		'		'
Debt Conversion, Original Debt, Amount	$1,000	'		'		'	'		'		'
Percentage of product of closing sale price of common stock and conversion rate	103.00%	'		'		'	'		'		'
Debt Instrument, Convertible, Conversion Price	$10.50	'		'		'	'		'		'
Senior Revolving Credit Facility [Member]	'	'		'		'	'		'		'
Debt Instrument [Line Items]	'	'		'		'	'		'		'
Debt instrument, interest rate	2.00%	'		'		0.00%	'		'		'
Debt Redemption Date December Twenty Two Thousand Thirteen [Member] | 2.625% Convertible Senior Subordinated Notes [Member]	'	'		'		'	'		'		'
Debt Instrument [Line Items]	'	'		'		'	'		'		'
Percentage of principal amount of debt redeemed	100.00%	'		'		'	'		'		'
[1]	The 2.625% Notes were redeemed by the Company on December 20, 2013.
[2]	Represents exchange expenses capitalized as debt issuance costs that are amortized using the effective interest method through the first put date of December 15, 2016.

LongTerm_Debt_LongTerm_Debt_Su

Long-Term Debt Long-Term Debt (Summary of 2.625% Notes Debt Exchanges) (Details) (USD $)

0 Months Ended

0 Months Ended

In Millions, unless otherwise specified

Mar. 22, 2013

Sep. 04, 2012

Dec. 15, 2011

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Mar. 22, 2013

Dec. 31, 2012

Sep. 04, 2012

Dec. 31, 2011

Dec. 15, 2011

Mar. 22, 2013

Sep. 04, 2012

Dec. 15, 2011

Mar. 22, 2013

Sep. 04, 2012

Dec. 15, 2011

2.625% Notes, Series B (net of discount of $21.7 million and $24.2 million, respectively) [Member]

2.625% Notes, Series B (net of discount of $21.7 million and $24.2 million, respectively) [Member]

2.625% Notes, Series B (net of discount of $21.7 million and $24.2 million, respectively) [Member]

2.625% Notes, Series B (net of discount of $21.7 million and $24.2 million, respectively) [Member]

2.625% Notes, Series B (net of discount of $21.7 million and $24.2 million, respectively) [Member]

2.625% Convertible Senior Subordinated Notes [Member]

2.625% Convertible Senior Subordinated Notes [Member]

2.625% Convertible Senior Subordinated Notes [Member]

2.625% Convertible Senior Subordinated Notes [Member]

2.625% Convertible Senior Subordinated Notes [Member]

2.625% Convertible Senior Subordinated Notes [Member]

Debt Exchange [Member]

Debt Exchange [Member]

Debt Exchange [Member]

Debt Exchange [Member]

Debt Exchange [Member]

Debt Exchange [Member]

2.625% Notes, Series B (net of discount of $21.7 million and $24.2 million, respectively) [Member]

2.625% Notes, Series B (net of discount of $21.7 million and $24.2 million, respectively) [Member]

2.625% Notes, Series B (net of discount of $21.7 million and $24.2 million, respectively) [Member]

2.625% Convertible Senior Subordinated Notes [Member]

2.625% Convertible Senior Subordinated Notes [Member]

2.625% Convertible Senior Subordinated Notes [Member]

Debt Instrument [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Par value of debt exchanged

'

'

'

'

'

'

'

'

'

'

'

$58.50

$99.90

$198.60

$60

$99.90

$198.60

Cash paid on repurchase of senior notes

0

2

15.9

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Debt instrument, discount

'

'

'

$21.70

$24.20

$0

$0.10

[1]

$7.10

$0.60

[1]

'

$1.40

[1]

'

'

'

'

'

'

Effective interest rate

'

'

'

'

'

4.70%

'

4.40%

'

5.25%

'

'

'

'

'

'

'

[1]

Represents exchange expenses capitalized as debt issuance costs that are amortized using the effective interest method through the first put date of December 15, 2016.

LongTerm_Debt_LongTerm_Debt_Ca

Long-Term Debt Long-Term Debt (Canada Revolving Line of Credit) (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Aug. 30, 2013	Oct. 10, 2013
	Canada revolving line of credit, interest payable quarterly at 1.84% [Member]	Canada revolving line of credit, interest payable quarterly at 1.84% [Member]	Senior Revolving Credit Facility [Member]
Debt Instrument [Line Items]	'	'	'
Credit facility, maximum borrowing capacity	'	$15	$800
Credit commitment outstanding	'	$15	'
Basis spread on variable rate	1.60%	'	'

LongTerm_Debt_Capital_Lease_Ob

Long-Term Debt (Capital Lease Obligations And Debt Guarantees) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2013	Dec. 31, 2012	Dec. 21, 2005	Dec. 31, 2013	Dec. 31, 2012	Dec. 15, 2006	Dec. 31, 2013	Dec. 31, 2013
In Millions, unless otherwise specified	Senior Revolving Credit Facility [Member]	Senior Revolving Credit Facility [Member]	Capital lease obligations [Member]	1.875% Notes [Member]	1.875% Notes [Member]	1.875% Notes [Member]	Series B 2.625% Convertible Senior Subordinated Notes [Member]	Series B 2.625% Convertible Senior Subordinated Notes [Member]	Series B 2.625% Convertible Senior Subordinated Notes [Member]	Minimum [Member]	Maximum [Member]
										Capital lease obligations [Member]	Capital lease obligations [Member]
Debt Instrument [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Capital lease obligations for machinery and equipment	'	'	$53.40	'	'	'	'	'	'	'	'
Debt instrument, interest rate	2.00%	0.00%	'	1.88%	1.88%	1.88%	2.63%	2.63%	2.63%	2.00%	5.20%

Earnings_Per_Share_and_Equity_1

Earnings Per Share and Equity (Narrative) (Details) (USD $)	12 Months Ended
In Millions, except Share data, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]	'	'	'
Anti-dilutive shares	12,300,000	15,700,000	11,700,000
Shares reissued or retired	0	'	'
Payments of tax withholding for restricted shares	$4.50	$9.60	$19.30
Shares reissued or retired	0	'	'
Non-controlling interest in consolidated subsidiary	32.8	29.6	25.3
Income attributable to non-controlling interests	$3.20	$4.30	$3.30
Treasury Stock [Member]	'	'	'
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]	'	'	'
Shares withheld for payment of taxes	581,585	1,141,640	2,037,941

Earnings_Per_Share_and_Equity_2

Earnings Per Share and Equity (Income per Share Calculations) (Details) (USD $)	3 Months Ended								12 Months Ended
In Millions, except Per Share data, unless otherwise specified	Dec. 31, 2013	Sep. 27, 2013	Jun. 28, 2013	Mar. 29, 2013	Dec. 31, 2012	Sep. 28, 2012	Jun. 29, 2012	Mar. 30, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Stockholders' Equity Note [Abstract]	'	'	'	'	'	'	'	'	'	'	'
Net income (loss) attributable to ON Semiconductor Corporation	$28.70	$51.80	$47.70	$22.60	($138.20)	$12.50	$6.90	$28.20	$150.80	($90.60)	$11.60
Basic weighted average common shares outstanding	'	'	'	'	'	'	'	'	447.9	452.6	446.7
Add: Incremental shares for:	'	'	'	'	'	'	'	'	'	'	'
Dilutive effect of share-based awards	'	'	'	'	'	'	'	'	2.8	0	7.6
Dilutive effect of convertible notes	'	'	'	'	'	'	'	'	0	0	2.9
Diluted weighted average common shares outstanding	'	'	'	'	'	'	'	'	450.7	452.6	457.2
Net income (loss) per common share attributable to ON Semiconductor Corporation:	'	'	'	'	'	'	'	'	'	'	'
Basic (dollars per common share)	'	'	'	'	'	'	'	'	$0.34	($0.20)	$0.03
Diluted (dollars per common share)	$0.06	$0.11	$0.11	$0.05	($0.31)	$0.03	$0.02	$0.06	$0.33	($0.20)	$0.03

Earnings_Per_Share_and_Equity_3

Earnings Per Share and Equity Summary of Share Repurchase Program (Details) (USD $)	12 Months Ended
In Millions, except Share data, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012
Equity [Abstract]	'		'
Number of repurchased shares	13,900,000	[1]	8,800,000	[1]
Aggregate purchase price	$101.30		$55.30
Fees, commissions and other expenses	0.3		0.2
Less: accrued share repurchases	-0.6	[2]	0	[2]
Total cash used for share repurchases	101		55.5
Weighted-average purchase price per share	$7.29		$6.26
Available for future purchases at period end	$143.40		$244.70
Shares reissued or retired	0		'
[1]	None of these shares had been reissued or retired as of December 31, 2013, but may be reissued or retired by the Company at a later date.
[2]	Represents unpaid amounts recorded in accrued expenses on the Company's Consolidated Balance Sheet.

ShareBased_Compensation_Summar

Share-Based Compensation (Summary Of Share-Based Compensation Expense) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]	'		'		'
Share-based compensation expenses	$32.30		$20.50		$33.50
Related income tax benefits	0	[1]	0	[1]	0	[1]
Share-based compensation expense, net of taxes	32.3		20.5		33.5
Cost Of Revenues [Member]	'		'		'
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]	'		'		'
Share-based compensation expenses	5.3		3.7		6.3
Research And Development [Member]	'		'		'
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]	'		'		'
Share-based compensation expenses	6.3		4.5		6.9
Selling And Marketing [Member]	'		'		'
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]	'		'		'
Share-based compensation expenses	5.7		4.3		6.4
General And Administrative [Member]	'		'		'
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]	'		'		'
Share-based compensation expenses	15		8		13.9
Restructuring Charges [Member]	'		'		'
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]	'		'		'
Share-based compensation expenses	$0		$0		$0
[1]	A majority of the Company’s share-based compensation relates to its domestic subsidiaries; therefore, no related deferred income tax benefits are recorded due to historical net operating losses at those subsidiaries.

ShareBased_Compensation_Weight

Share-Based Compensation (Weighted-Average Assumptions Of Employee Stock Options) (Details) (Employee Stock Option [Member], USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Employee Stock Option [Member]	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Volatility	42.80%	46.90%	52.10%
Risk-free interest rate	1.40%	0.80%	1.20%
Expected term	'5 years 2 months	'5 years	'4 years 9 months 18 days
Weighted-average fair value per option	$2.93	$3.01	$3.88

ShareBased_Compensation_Summar1

Share-Based Compensation (Summary Of Stock Option Plans) (Details) (USD $)	12 Months Ended
In Millions, except Per Share data, unless otherwise specified	Dec. 31, 2013
Summary of Stock Option Activity [Roll Forward]	'
Number of Shares, Beginning	17.2
Number of Shares, Granted	0.1
Number of Shares, Exercised	-2.1
Number of Shares, Canceled	-1.2
Number of Shares, Ending	14
Weighted Average Exercise Price [Roll Forward]	'
Weighted-Average Exercise Price, Beginning	$7.70
Weighted-Average Exercise Price. Granted	$7.39
Weighted-Average Exercise Price, Exercised	$5.82
Weighted-Average Exercise Price, Cancelled	$8.67
Weighted-Average Exercise Price, Ending	$7.89
Weighted Average Remaining Contractual Term (in years), Outstanding	'3 years 4 months 24 days
Aggregate Intrinsic Value (In-The-Money), Outstanding	$14.80
Number of Shares, Exercisable	11.6
Weighted-Average Exercise Price, Exercisable	$7.99
Weighted-Average Remaining Contractual Term (in years), Exercisable	'3 years 1 month 6 days
Aggregate Intrinsic Value (In-The-Money), Exercisable	$12.40

ShareBased_Compensation_Additi

Share-Based Compensation (Additional Information On Stock Options Outstanding) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Millions, except Per Share data, unless otherwise specified
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]	'	'
Total exercisable outstanding	11.6	'
Number of Shares, Unexercisable	2.4	'
Total options outstanding	14	17.2
Option Price Less Than Closing Price Of Common Stock At End Of Quarter [Member]	'	'
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]	'	'
Number of Shares, Exercisable	6.2	'
Weighted Average Exercise Price, Exercisable	6.23	'
Number of Shares, Unexercisable	1.6	'
Weighted Average Exercise Price, Unexercisable	6.75	'
Number of Shares, Total	7.8	'
Weighted Average Exercise Price, Total	6.33	'
Option Price Above Closing Price Of Common Stock At End Of Quarter [Member]	'	'
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]	'	'
Number of Shares, Exercisable	5.4	'
Weighted Average Exercise Price, Exercisable	9.97	'
Number of Shares, Unexercisable	0.8	'
Weighted Average Exercise Price, Unexercisable	8.86	'
Number of Shares, Total	6.2	'
Weighted Average Exercise Price, Total	9.82	'
Total Outstanding [Member]	'	'
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]	'	'
Weighted Average Exercise Price, Exercisable	7.99	'
Weighted Average Exercise Price, Unexercisable	7.45	'
Weighted Average Exercise Price, Total	7.89	'

ShareBased_Compensation_Summar2

Share-Based Compensation (Summary Of Restricted Stock Units Transactions) (Details) (Restricted Stock Units [Member], USD $)	12 Months Ended
In Millions, except Per Share data, unless otherwise specified	Dec. 31, 2013
Restricted Stock Units [Member]	'
Restricted Stock Activity [Roll Forward]	'
Nonvested shares of restricted stock units beginning	8.9
Number of Shares, Granted	5.3
Number of Shares, Released	-2.3
Number of Shares, Cancelled	-1.1
Nonvested shares of restricted stock units ending	10.8
Weighted Average Grant Date Fair Value [Roll Forward]	'
Weighted Average Grant Date Fair Value, Nonvested shares of restricted stock units beginning	$8.75
Weighted Average Grant Date Fair Value, Granted	$7.91
Weighted Average Grant Date Fair Value, Released	$7.83
Weighted Average Grant Date Fair Value, Forfeited	$8.87
Weighted Average Grant Date Fair Value, Nonvested shares of restricted stock units ending	$8.52

ShareBased_Compensation_Narrat

Share-Based Compensation (Narrative) (Details) (USD $)

12 Months Ended

2 Months Ended

12 Months Ended

0 Months Ended

12 Months Ended

12 Months Ended

12 Months Ended

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Feb. 16, 2010

Dec. 31, 2013

Dec. 31, 2013

15-May-12

14-May-12

15-May-13

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

31-May-09

Dec. 31, 2013

Dec. 31, 2013

2000 Stock Incentive Plan [Member]

2000 Stock Incentive Plan [Member]

Amended And Restated Stock Incentive Plan [Member]

Amended And Restated Stock Incentive Plan [Member]

Amended And Restated Stock Incentive Plan [Member]

Employee Stock [Member]

Employee Stock Purchase Plan [Member]

Employee Stock Purchase Plan [Member]

Employee Stock Purchase Plan [Member]

Employee Stock Option [Member]

Employee Stock Option [Member]

Employee Stock Option [Member]

Time Based Restricted Stock Units [Member]

Restricted Stock Units [Member]

Restricted Stock Units [Member]

Restricted Stock Units [Member]

Restricted Stock Units [Member]

Restricted Stock Units [Member]

Performance Based Restricted Stock Units [Member]

Restricted Stock [Member]

Employee Stock Purchase Plan [Member]

Employee Stock Purchase Plan [Member]

Director [Member]

Officers And Employees [Member]

Minimum [Member]

Maximum [Member]

Minimum [Member]

Maximum [Member]

Restricted Stock [Member]

Restricted Stock Units [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Unrecognized share-based compensation expense on non-vested stock awards

'

'

'

'

'

'

'

'

'

'

'

'

$5,500,000

'

'

$38,400,000

$34,200,000

'

'

'

'

$4,200,000

'

'

'

'

'

Recognition period for compensation expense

'

'

'

'

'

'

'

'

'

'

'

'

'2 years 2 months 12 days

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Total Intrinsic value of stock options exercised

4,300,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Cash received from exercise of stock options

12,100,000

9,400,000

59,400,000

'

'

'

'

'

'

12,100,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

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

8,300,000

8,300,000

8,100,000

'

'

'

'

'

'

8,300,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Pre-vesting forfeitures

11.00%

11.00%

11.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

5.00%

4.00%

8.00%

'

'

'

'

'

'

'

'

Common stock reserved and available for grant

'

'

'

30,500,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Additional common shares reserved for issuance as a percentage of common stock outstanding

'

'

'

3.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Award vesting period

'

'

'

'

'

'

'

'

'

'

'

'

'

'3 years

'4 years

'

'

'

'

'3 years

'4 years

'

'

'

'

'

'

Term of grant agreement

'

'

'

'

'10 years

'7 years

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Period after terminition in which options can be exercised

'90 days

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Aggregate of common stock available for grant

'

'

'

'

'

37,400,000

'

'

18,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Number of options vested and expected to vest

13,700,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Weighted average exercise price of options vested and expected to vest

$7.91

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Net stock options as a percentage of outstanding shares at beginning of period

-0.24%

0.07%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Stock options granted as a percentage of outstanding shares at end of period

0.03%

0.62%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Share Price

$8.24

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Equity awards granted in period

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

5,300,000

'

'

'

'

'

'

'

'

200,000

1,600,000

Compensation expense recognized on restricted stock units

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

18,200,000

25,000,000

'

'

'

'

'

'

'

'

'

'

Weighted average grant date fair value

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$7.91

'

'

'

'

'

'

'

'

$8.49

'

Share-based compensation expenses

32,300,000

20,500,000

33,500,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

4,300,000

'

'

1,400,000

'

Maximum employee subscription rate for the ESPP

'

'

'

'

'

'

'

'

'

10.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Discount rate from market value paid by participants for shares under the plan

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

85.00%

'

'

'

Maximum annual amount of purchases per employee under the plan

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

25,000

'

'

'

Shares authorized for purchase per employee per quarter

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

500

'

'

'

Maximum fair value of shares employee may purchase in a quarter

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$6,250

'

'

'

Shares issued pursuant to the employee stock purchase plan, shares

'

'

'

'

'

'

'

'

'

1,300,000

1,400,000

1,200,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized

'

'

'

'

'

'

'

'

3,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Shares available for issuance under the plan

'

'

'

'

'

'

59,100,000

33,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

15,000,000

'

'

Employee_Benefit_Plans_Narrati

Employee Benefit Plans (Narrative) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Defined Benefit Plan, Actuarial Gain (Loss)	($14.30)	($13.90)	'
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Curtailments	15.6	6.6	-2
Defined Contribution Plan, Employer Discretionary Contribution Amount	'	7.5	'
Total underfunded status	128.9	'	'
Expected company contribution in the current period	14.8	'	'
Defined Benefit Plan, Expected Future Benefit Payments, Next Twelve Months	44.4	'	'
Employer contribution as percentage of employee contribution	100.00%	'	'
Percentage of employee contribution, basis for employer contribution	4.00%	'	'
Restructuring Charges [Member]	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Defined Benefit Plan, Expected Future Benefit Payments, Next Twelve Months	25.9	'	'
Foreign Pension Plans [Member]	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Compensation expense recognized	4.1	3.4	2
Savings Plan [Member]	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Compensation expense recognized	8.4	8.3	8.7
Equity Securities [Member] | Foreign Pension Plans [Member]	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Assets of foreign plans investment in equity securities	18.00%	0.00%	'
Debt Securities [Member] | Foreign Pension Plans [Member]	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Assets of foreign plans investment in equity securities	23.00%	3.00%	'
Corporate bonds [Member] | Foreign Pension Plans [Member]	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Assets of foreign plans investment in equity securities	46.00%	25.00%	'
Cash and Cash Equivalents [Member] | Foreign Pension Plans [Member]	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Assets of foreign plans investment in equity securities	4.00%	62.00%	'
Other Investments [Member] | Foreign Pension Plans [Member]	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Assets of foreign plans investment in equity securities	9.00%	10.00%	'
Multiemployer Plans, Pension [Member]	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Multiemployer Plans, withdrawal obligation	'	214.5	'
Defined Benefit Plan, Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets, Aggregate Fair Value of Plan Assets	'	83.6	'
Defined Benefit Plan, Net Pension Benefit Obligation	'	130.9	'
Pension and Other Postretirement Benefit Expense	'	10.7	16.4
Q1 2013 Voluntary Retirement Program [Member]	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Defined Benefit Plan, Actuarial Gain (Loss)	-13.6	'	'
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Curtailments	12.7	'	'
Q4 2013 Voluntary Retirement Program [Member]	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Defined Benefit Plan, Actuarial Gain (Loss)	7.4	'	'
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Curtailments	$2.90	'	'

Employee_Benefit_Plans_Summary

Employee Benefit Plans (Summary Of Net Periodic Pension Cost) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]	'	'	'
Service cost	$12.20	$7.50	$9.40
Interest cost	6.6	5.3	5.2
Expected return on plan assets	-4.1	-3.5	-4
Amortization of prior service cost	0	0.1	2.6
Curtailment (gain) loss	-15.6	-6.6	2
Actuarial and other loss (gain)	6.2	12.5	-3.1
Total net periodic pension cost	$5.30	$15.30	$12.10
Discount rate	2.14%	2.44%	3.50%
Expected return on plan assets	2.18%	3.21%	4.07%
Rate of compensation increase	3.17%	3.05%	4.66%

Employee_Benefit_Plans_Summary1

Employee Benefit Plans (Summary Of Status Of Foreign Pension Plans) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Change in projected benefit obligation	'	'	'
Projected benefit obligation at the beginning of the year	$379.80	$176.40	'
Benefit obligation assumed upon withdrawal from Systems Solutions Group multi-employer plans	0	214.5	'
Service cost	12.2	7.5	9.4
Interest cost	6.6	5.3	5.2
Net actuarial loss	14.3	13.9	'
Benefits paid by plan assets	-22.3	-13.3	'
Benefits paid by the Company	-32.1	-11.4	'
Curtailment gain	-15.6	-6.6	'
Translation gain and other	-50.6	-6.5	'
Projected benefit obligation at the end of the year	292.3	379.8	176.4
Accumulated benefit obligation at the end of the year	254.9	281.2	'
Change in plan assets	'	'	'
Fair value of plan assets at the beginning of the year	178.4	105.5	'
Assets assumed due to withdrawal from multi-employer plans	0	83.6	'
Transfer to defined contribution plan	0	-7.5	'
Actual return on plan assets	12.2	5.4	'
Benefits paid from plan assets	-22.3	-13.3	'
Employer contributions	16.2	6.6	'
Translation and other loss	-21.1	-1.9	'
Fair value of plan assets at the end of the year	163.4	178.4	105.5
Plans with underfunded or non-funded accumulated benefit obligation	'	'	'
Aggregate accumulated benefit obligation	220.7	248.8	'
Aggregate fair value of plan assets	116.2	124.8	'
Amounts recognized in the balance sheet consist of	'	'	'
Non-current assets	0.6	0.2	'
Current liabilities	-10.4	-7.4	'
Non-current liabilities	-119.1	-194.2	'
Funded status	-128.9	-201.4	'
Amounts recognized in accumulated other comprehensive income consist of	'	'	'
Prior service cost	$0	$0.10	'
Weighted average assumptions at the end of the year	'	'	'
Discount rate	2.14%	2.44%	'
Rate of compensation increase	3.17%	3.05%	'

Employee_Benefit_Plans_Fair_Va

Employee Benefit Plans (Fair Value Measurement Of Plan Assets) (Details) (USD $)	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
In Millions, unless otherwise specified
Defined Benefit Plan Disclosure [Line Items]	'		'		'
Plan assets	$163.40		$178.40		$105.50
Cash/Money Markets [Member]	'		'		'
Defined Benefit Plan Disclosure [Line Items]	'		'		'
Plan assets	7.5		111.4		'
Foreign Government Securities [Member]	'		'		'
Defined Benefit Plan Disclosure [Line Items]	'		'		'
Plan assets	8.7	[1]	12.6	[1]	'
Corporate Bonds, Debentures [Member]	'		'		'
Defined Benefit Plan Disclosure [Line Items]	'		'		'
Plan assets	36.8	[2]	4.4	[2]	'
Equity Securities [Member]	'		'		'
Defined Benefit Plan Disclosure [Line Items]	'		'		'
Plan assets	29.4	[3]	'		'
Mutual Funds [Member]	'		'		'
Defined Benefit Plan Disclosure [Line Items]	'		'		'
Plan assets	5.8		4.6		'
Insurance Contracts [Member]	'		'		'
Defined Benefit Plan Disclosure [Line Items]	'		'		'
Plan assets	75.2	[4]	45.4	[4]	'
Quoted Prices in Active Markets for Identical Assets (Level 1)	'		'		'
Defined Benefit Plan Disclosure [Line Items]	'		'		'
Plan assets	53.1		120.8		'
Quoted Prices in Active Markets for Identical Assets (Level 1) | Cash/Money Markets [Member]	'		'		'
Defined Benefit Plan Disclosure [Line Items]	'		'		'
Plan assets	7.5		111.4		'
Quoted Prices in Active Markets for Identical Assets (Level 1) | Foreign Government Securities [Member]	'		'		'
Defined Benefit Plan Disclosure [Line Items]	'		'		'
Plan assets	7.8	[1]	9	[1]	'
Quoted Prices in Active Markets for Identical Assets (Level 1) | Corporate Bonds, Debentures [Member]	'		'		'
Defined Benefit Plan Disclosure [Line Items]	'		'		'
Plan assets	17.9	[2]	0.4	[2]	'
Quoted Prices in Active Markets for Identical Assets (Level 1) | Equity Securities [Member]	'		'		'
Defined Benefit Plan Disclosure [Line Items]	'		'		'
Plan assets	19.9	[3]	'		'
Quoted Prices in Active Markets for Identical Assets (Level 1) | Mutual Funds [Member]	'		'		'
Defined Benefit Plan Disclosure [Line Items]	'		'		'
Plan assets	0		0		'
Quoted Prices in Active Markets for Identical Assets (Level 1) | Insurance Contracts [Member]	'		'		'
Defined Benefit Plan Disclosure [Line Items]	'		'		'
Plan assets	0	[4]	0	[4]	'
Significant Observable Inputs (Level 2) [Member]	'		'		'
Defined Benefit Plan Disclosure [Line Items]	'		'		'
Plan assets	61.5		9.6		'
Significant Observable Inputs (Level 2) [Member] | Cash/Money Markets [Member]	'		'		'
Defined Benefit Plan Disclosure [Line Items]	'		'		'
Plan assets	0		0		'
Significant Observable Inputs (Level 2) [Member] | Foreign Government Securities [Member]	'		'		'
Defined Benefit Plan Disclosure [Line Items]	'		'		'
Plan assets	0.9	[1]	3.6	[1]	'
Significant Observable Inputs (Level 2) [Member] | Corporate Bonds, Debentures [Member]	'		'		'
Defined Benefit Plan Disclosure [Line Items]	'		'		'
Plan assets	18	[2]	0.7	[2]	'
Significant Observable Inputs (Level 2) [Member] | Equity Securities [Member]	'		'		'
Defined Benefit Plan Disclosure [Line Items]	'		'		'
Plan assets	9.5	[3]	'		'
Significant Observable Inputs (Level 2) [Member] | Mutual Funds [Member]	'		'		'
Defined Benefit Plan Disclosure [Line Items]	'		'		'
Plan assets	5.8		4.6		'
Significant Observable Inputs (Level 2) [Member] | Insurance Contracts [Member]	'		'		'
Defined Benefit Plan Disclosure [Line Items]	'		'		'
Plan assets	27.3	[4]	0.7	[4]	'
Significant Unobservable Inputs (Level 3) [Member]	'		'		'
Defined Benefit Plan Disclosure [Line Items]	'		'		'
Plan assets	48.8		48		5.1
Significant Unobservable Inputs (Level 3) [Member] | Cash/Money Markets [Member]	'		'		'
Defined Benefit Plan Disclosure [Line Items]	'		'		'
Plan assets	0		0		'
Significant Unobservable Inputs (Level 3) [Member] | Foreign Government Securities [Member]	'		'		'
Defined Benefit Plan Disclosure [Line Items]	'		'		'
Plan assets	0	[1]	0	[1]	'
Significant Unobservable Inputs (Level 3) [Member] | Corporate Bonds, Debentures [Member]	'		'		'
Defined Benefit Plan Disclosure [Line Items]	'		'		'
Plan assets	0.9	[2]	3.3	[2]	4.1
Significant Unobservable Inputs (Level 3) [Member] | Equity Securities [Member]	'		'		'
Defined Benefit Plan Disclosure [Line Items]	'		'		'
Plan assets	0	[3]	'		'
Significant Unobservable Inputs (Level 3) [Member] | Mutual Funds [Member]	'		'		'
Defined Benefit Plan Disclosure [Line Items]	'		'		'
Plan assets	0		0		'
Significant Unobservable Inputs (Level 3) [Member] | Insurance Contracts [Member]	'		'		'
Defined Benefit Plan Disclosure [Line Items]	'		'		'
Plan assets	$47.90	[4]	$44.70	[4]	$1
[1]	Includes investments primarily in guaranteed return securities.
[2]	Includes investments in government bonds and corporate bonds of developed countries, emerging market government bonds, emerging market corporate bonds and convertible bonds.
[3]	Includes investments in equity securities of developed countries and emerging markets.
[4]	Includes certain investments with insurance companies which guarantee a minimum rate of return on the investment.

Employee_Benefit_Plans_Activit

Employee Benefit Plans (Activity Of Plan Assets With Fair Value Measurement Using Significant Unobservable Inputs) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]	'		'
Fair value of plan assets at the beginning of the year	$178.40		$105.50
Actual return on plan assets	12.2		5.4
Fair value of plan assets at the end of the year	163.4		178.4
Corporate Bonds, Debentures [Member]	'		'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]	'		'
Fair value of plan assets at the end of the year	36.8	[1]	4.4	[1]
Insurance Contracts [Member]	'		'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]	'		'
Fair value of plan assets at the end of the year	75.2	[2]	45.4	[2]
Significant Unobservable Inputs (Level 3) [Member]	'		'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]	'		'
Fair value of plan assets at the beginning of the year	48		5.1
Purchase, sales and settlements	-2.7		-1.5
Transfers in and/or out of Level 3	'		44.4
Actual return on plan assets	3.5		'
Fair value of plan assets at the end of the year	48.8		48
Significant Unobservable Inputs (Level 3) [Member] | Corporate Bonds, Debentures [Member]	'		'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]	'		'
Fair value of plan assets at the beginning of the year	3.3	[1]	4.1
Purchase, sales and settlements	-2.4		-1.2
Transfers in and/or out of Level 3	'		0.4
Actual return on plan assets	0		'
Fair value of plan assets at the end of the year	0.9	[1]	3.3	[1]
Significant Unobservable Inputs (Level 3) [Member] | Insurance Contracts [Member]	'		'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]	'		'
Fair value of plan assets at the beginning of the year	44.7	[2]	1
Purchase, sales and settlements	-0.3		-0.3
Transfers in and/or out of Level 3	'		44
Actual return on plan assets	3.5		'
Fair value of plan assets at the end of the year	$47.90	[2]	$44.70	[2]
[1]	Includes investments in government bonds and corporate bonds of developed countries, emerging market government bonds, emerging market corporate bonds and convertible bonds.
[2]	Includes certain investments with insurance companies which guarantee a minimum rate of return on the investment.

Employee_Benefit_Plans_Expecte

Employee Benefit Plans (Expected Benefit Payments) (Details) (USD $)	Dec. 31, 2013
In Millions, unless otherwise specified
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]	'
2014	$44.40
2015	2.3
2016	2.3
2017	2.6
2018	3.5
5 years thereafter	46.9
Total	$102

Commitments_And_Contingencies_1

Commitments And Contingencies (Operating Leases Future Minimum Payments Receivable) (Details) (USD $)	Dec. 31, 2013
In Millions, unless otherwise specified
Commitments and Contingencies Disclosure [Abstract]	'
2014	$18.40
2015	13.9
2016	10.8
2017	8.7
2018	13.6
Thereafter	26
Total	$91.40

Commitments_And_Contingencies_2

Commitments And Contingencies (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Loss Contingencies [Line Items]	'	'	'
Total rent expense	$22,000,000	$24,000,000	$27,700,000
Availability under senior revolving credit facility	40,000,000	'	'
Outstanding guarantees and letters of credit	5,800,000	'	'
Guarantees related to capital lease obligations	77,100,000	'	'
Net carrying value	942,200,000	1,011,900,000	'
SANYO Electric [Member]	'	'	'
Loss Contingencies [Line Items]	'	'	'
Net carrying value	273,700,000	302,000,000	'
Senior Revolving Credit Facility [Member]	'	'	'
Loss Contingencies [Line Items]	'	'	'
Net carrying value	120,000,000	0	'
Senior Revolving Credit Facility [Member] | Letter of Credit [Member]	'	'	'
Loss Contingencies [Line Items]	'	'	'
Credit commitment outstanding	$200,000	'	'

Fair_Value_Of_Financial_Instru1

Fair Value Of Financial Instruments (Fair Value Of Assets And Liabilities Measured On Recurring Basis) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Estimate of Fair Value [Member] | Demand and time deposits [Member]	'	'
Cash and cash equivalents	$447.50	$385.90
Estimate of Fair Value [Member] | Treasuries [Member]	'	'
Cash and cash equivalents	0	100.7
Estimate of Fair Value [Member] | Corporate bonds [Member]	'	'
Cash and cash equivalents	0	0.3
Estimate of Fair Value [Member] | Foreign Exchange Contract [Member]	'	'
Other Current Assets	0	3.2
Liabilities	0.1	0
Quoted Prices in Active Markets (Level 1) [Member] | Demand and time deposits [Member]	'	'
Cash and cash equivalents	'	385.9
Quoted Prices in Active Markets (Level 1) [Member] | Treasuries [Member]	'	'
Cash and cash equivalents	0	100.7
Quoted Prices in Active Markets (Level 1) [Member] | Corporate bonds [Member]	'	'
Cash and cash equivalents	0	0.3
Quoted Prices in Active Markets (Level 1) [Member] | Foreign Exchange Contract [Member]	'	'
Other Current Assets	0	3.2
Liabilities	0.1	0
Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value [Member] | Money Market Funds [Member]	'	'
Cash and cash equivalents	62	0
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets (Level 1) [Member] | Demand and time deposits [Member]	'	'
Cash and cash equivalents	447.5	'
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets (Level 1) [Member] | Money Market Funds [Member]	'	'
Cash and cash equivalents	$62	$0

Fair_Value_Measurements_Fair_V

Fair Value Measurements Fair Value of Short-term Investments (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Carried at Amortized Cost	$116.20	$144.80
Unrecognized Gain/(Loss)	0	-0.1
Fair Value	116.2	144.7
Commercial paper [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Carried at Amortized Cost	15.5	25.5
Unrecognized Gain/(Loss)	0	0
Fair Value	15.5	25.5
Corporate bonds [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Carried at Amortized Cost	93.7	119.3
Unrecognized Gain/(Loss)	0	-0.1
Fair Value	93.7	119.2
Government agencies [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Carried at Amortized Cost	7	0
Unrecognized Gain/(Loss)	0	0
Fair Value	$7	$0

Fair_Value_Of_Financial_Instru2

Fair Value Of Financial Instruments (Carrying Amounts And Fair Values Of Long-Term Borrowings) (Details) (USD $)

12 Months Ended

3 Months Ended

12 Months Ended

In Millions, unless otherwise specified

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2012

Dec. 31, 2012

Dec. 31, 2012

Fair Value, Measurements, Nonrecurring [Member]

Fair Value, Measurements, Nonrecurring [Member]

Fair Value, Measurements, Nonrecurring [Member]

Fair Value, Measurements, Nonrecurring [Member]

Convertible Notes [Member]

Convertible Notes [Member]

Long-term Debt [Member]

Long-term Debt [Member]

System Solutions Group [Member]

System Solutions Group Asset Impairment [Member]

System Solutions Group Asset Impairment [Member]

Adjustment [Member]

Adjustment [Member]

Adjustment [Member]

Adjustment [Member]

Level 3 [Member]

Level 3 [Member]

Carrying Amount

'

'

'

'

'

'

'

$335.20

$473.10

$510.20

$403.90

'

'

'

Fair Value

'

'

'

'

'

'

'

392.6

530.9

511.4

380.6

'

'

'

Property, Plant, and Equipment, Fair Value Disclosure

'

'

'

'

'

8

103

'

'

'

'

'

'

'

Goodwill of impaired reporting unit

8.7

134.1

'

'

'

0

14.1

'

'

'

'

'

'

'

Intangible Assets (Excluding Goodwill), Fair Value Disclosure

0

8.2

'

'

'

0

35.4

'

'

'

'

'

'

'

Assets, Fair Value Disclosure

8.7

142.3

'

8

152.5

'

'

'

'

'

'

'

'

'

Impairment of long-lived assets

'

'

'

'

'

'

'

'

'

'

'

126

'

'

Asset impairment charges

8

103

86.3

'

'

'

'

'

'

'

'

'

94.4

94.4

Impairment of Intangible Assets, Finite-lived

$40.60

$40.60

'

'

'

'

'

'

'

'

'

$31.60

'

'

Financial_Instruments_Schedule

Financial Instruments (Schedule Of Net Foreign Exchange Positions) (Details) (Foreign Exchange Contract [Member], USD $)	Dec. 31, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Financial Instruments [Line Items]	'	'
Buy (Sell)	$20.90	($105.30)
Notional Amount	101.7	197.3
Euro [Member]	'	'
Financial Instruments [Line Items]	'	'
Buy (Sell)	-30.5	-17.4
Notional Amount	30.5	17.4
Japanese Yen [Member]	'	'
Financial Instruments [Line Items]	'	'
Buy (Sell)	-6.7	-123.3
Notional Amount	6.7	123.3
Malaysian Ringgit [Member]	'	'
Financial Instruments [Line Items]	'	'
Buy (Sell)	35.8	32.7
Notional Amount	35.8	32.7
Philippine Peso [Member]	'	'
Financial Instruments [Line Items]	'	'
Buy (Sell)	11.7	4.2
Notional Amount	11.7	4.2
Other Currencies [Member]	'	'
Financial Instruments [Line Items]	'	'
Buy (Sell)	10.6	-1.5
Notional Amount	$17	$19.70

Financial_Instruments_Narrativ

Financial Instruments (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Derivatives, Fair Value [Line Items]	'	'	'
Other assets	$89,300,000	$122,200,000	'
Other liabilities	819,200,000	1,024,300,000	'
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax	-2,600,000	800,000	0
Not Designated as Hedging Instrument [Member]	'	'	'
Derivatives, Fair Value [Line Items]	'	'	'
Other assets	0	2,400,000	'
Other liabilities	100,000	0	'
Other Liabilities [Member] | Cash Flow Hedging [Member]	'	'	'
Derivatives, Fair Value [Line Items]	'	'	'
Derivative Liability, Fair Value, Gross Liability	1,800,000	0	'
Other Current Assets [Member] | Cash Flow Hedging [Member]	'	'	'
Derivatives, Fair Value [Line Items]	'	'	'
Derivative asset amount	0	800,000	'
Foreign Exchange Contract [Member]	'	'	'
Derivatives, Fair Value [Line Items]	'	'	'
Derivative amount	101,700,000	197,300,000	'
Realized and unrealized foreign currency transaction gain (loss)	5,500,000	3,500,000	-8,900,000
Foreign Exchange Contract [Member] | Cash Flow Hedging [Member]	'	'	'
Derivatives, Fair Value [Line Items]	'	'	'
Derivative amount	$42,900,000	'	'

Income_Taxes_Narrative_Details

Income Taxes (Narrative) (Details) (USD $)	12 Months Ended								3 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2013	Dec. 31, 2013	Dec. 31, 2013	Dec. 31, 2013	Dec. 31, 2013
					Federal [Member]	State [Member]	Foreign [Member]	Stock Option Deductions [Member]	Restatement Adjustment [Member]
									Netting of Deferred Tax Assets with Deferred Tax Liabilities [Member]
Income Taxes [Line Items]	'	'	'	'	'	'	'	'	'
Error correction - increase to deferred tax assets	'	'	'	'	'	'	'	'	$10,700,000
Error correction - increase to deferred tax liabilities	'	'	'	'	'	'	'	'	10,700,000
Error correction - corresponding increase in valuation allowance for the increase in deferred tax assets	1,327,200,000	1,420,100,000	'	'	'	'	'	194,000,000	10,700,000
Error correction - Provision for income taxes	26,900,000	13,400,000	22,900,000	'	'	'	'	'	10,700,000
Net operating loss carryforwards	'	'	'	'	1,043,700,000	1,110,500,000	1,718,900,000	'	'
Limitation for the use of federal NOL's	93,100,000	'	'	'	'	'	'	'	'
Income and withholding taxes, foreign	22,200,000	21,700,000	19,400,000	'	'	'	'	'	'
New reserves and interest on existing reserve for potential liabilities	900,000	900,000	2,900,000	'	'	'	'	'	'
Deferred federal income taxes associated with tax deductible goodwill	13,200,000	0	0	'	'	'	'	'	'
Additional valuation allowance	6,000,000	-7,800,000	-3,200,000	'	'	'	'	'	'
Reversal of reserves and interest for potential liabilities	3,400,000	1,400,000	'	'	'	'	'	'	'
Reversal of accrued income taxes for anticipated audit issues	'	'	2,600,000	'	'	'	'	'	'
Undistributed earnings to be reinvested	1,378,500,000	'	'	'	'	'	'	'	'
Estimated foreign witholding taxes on repatriation of foreign income	10,300,000	'	'	'	'	'	'	'	'
Estimated federal taxes on repatriation of foreign income	31,900,000	'	'	'	'	'	'	'	'
Estimated state income taxes on repatriation of foreign income	3,000,000	'	'	'	'	'	'	'	'
Balance of unrecognized tax benefit	20,900,000	34,800,000	18,600,000	13,400,000	'	'	'	'	'
Unrecognized tax position, that would affect the annual effective tax rate	13,700,000	'	'	'	'	'	'	'	'
Change in tax position reasonably possible	1,700,000	'	'	'	'	'	'	'	'
Interest and penalties recognized	500,000	200,000	-100,000	'	'	'	'	'	'
Accrued interest and penalties	$3,600,000	$3,000,000	$2,900,000	'	'	'	'	'	'

Income_Taxes_Income_Loss_Befor

Income Taxes (Income (Loss) Before Income Taxes And Minority Interests) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax Disclosure [Abstract]	'	'	'
United States	($76.80)	($72)	($143.90)
Foreign	257.7	-0.9	181.7
Income (loss) before income taxes	$180.90	($72.90)	$37.80

Income_Taxes_Provision_Benefit

Income Taxes (Provision (Benefit) For Income Taxes) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Current:	'	'	'
Federal	($0.40)	$0.20	$0.50
State and local	0.3	-0.1	0.3
Foreign	15.9	16.4	25
Current, Provision (benefit) for income taxes	15.8	16.5	25.8
Deferred:	'	'	'
Federal	13.2	0	0
Foreign	-2.1	-3.1	-2.9
Deferred, Provision (benefit) for income taxes	11.1	-3.1	-2.9
Provision (benefit) for income taxes	$26.90	$13.40	$22.90

Income_Taxes_Reconciliation_Of

Income Taxes (Reconciliation Of The U.S. Federal Statutory Income Tax Rate) (Details)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax Disclosure [Abstract]	'	'	'
U.S. federal statutory rate	35.00%	35.00%	35.00%
Increase (decrease) resulting from:	'	'	'
State and local taxes, net of federal tax benefit	0.20%	0.10%	0.70%
Foreign withholding taxes	0.00%	-0.30%	0.10%
Foreign rate differential	-38.50%	10.40%	-588.00%
Dividend income from foreign subsidiaries	10.60%	-62.70%	146.10%
Goodwill impairment	0.00%	-6.80%	0.00%
Gain on SANYO Semiconductor Transaction	0.00%	0.00%	-22.50%
Change in valuation allowance	8.20%	-1.60%	491.50%
Tax reserves	-0.90%	-2.30%	0.80%
Return to accrual	-0.10%	12.30%	0.00%
Other	0.40%	-2.50%	-3.10%
Effective income tax rate	14.90%	-18.40%	60.60%

Income_Taxes_Tax_Effects_Of_Te

Income Taxes (Tax Effects Of Temporary Differences) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Income Tax Disclosure [Abstract]	'	'
Net operating loss and tax credit carryforwards	$1,023.90	$952
Tax-deductible goodwill and amortizable intangibles	-7.7	18.2
Reserves and accruals	82.5	98.8
Property, plant and equipment	81.4	147.2
Inventories	28.1	83.8
Other	105.2	116
Deferred tax assets and liabilities before valuation allowance	1,313.40	1,416
Valuation allowance	-1,327.20	-1,420.10
Net deferred tax asset (liability)	($13.80)	($4.10)

Income_Taxes_Activity_For_Unre

Income Taxes (Activity For Unrecognized Gross Tax Benefits) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Unrecognized Gross Tax Benefits	'	'	'
Balance at beginning of year	$34.80	$18.60	$13.40
Reserves acquired	0	0	1.3
Additions based on tax positions related to the current year	0.7	18.4	5.5
Additions for tax positions of prior years	0	0	0.8
Reductions for tax positions of prior years	-10.9	-0.8	-1.4
Lapse of statute	-3.7	-1.2	-1
Settlements	0	-0.2	0
Balance at end of year	$20.90	$34.80	$18.60

Changes_in_Accumulated_Other_C2

Changes in Accumulated Other Comprehensive Loss Company's Accumulated Other Comprehensive Loss (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]	'	'	'
Beginning Balance	($41.10)	'	'
Other comprehensive income (loss) prior to reclassifications	17.2	'	'
Amounts reclassified from accumulated other comprehensive loss	-23.5	'	'
Net current period other comprehensive loss	-6.3	5.6	12.4
Ending Balance	-47.4	-41.1	'
Accumulated Translation Adjustment [Member]	'	'	'
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]	'	'	'
Beginning Balance	-42.2	'	'
Other comprehensive income (loss) prior to reclassifications	17.2	'	'
Amounts reclassified from accumulated other comprehensive loss	-21	'	'
Net current period other comprehensive loss	-3.8	'	'
Ending Balance	-46	'	'
Accumulated Defined Benefit Plans Adjustment [Member]	'	'	'
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]	'	'	'
Beginning Balance	-0.1	'	'
Other comprehensive income (loss) prior to reclassifications	0.1	'	'
Amounts reclassified from accumulated other comprehensive loss	0	'	'
Net current period other comprehensive loss	0.1	'	'
Ending Balance	0	'	'
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]	'	'	'
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]	'	'	'
Beginning Balance	0.8	'	'
Other comprehensive income (loss) prior to reclassifications	-0.1	'	'
Amounts reclassified from accumulated other comprehensive loss	-2.5	'	'
Net current period other comprehensive loss	-2.6	'	'
Ending Balance	-1.8	'	'
Accumulated Net Unrealized Investment Gain (Loss) [Member]	'	'	'
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]	'	'	'
Beginning Balance	0.4	'	'
Other comprehensive income (loss) prior to reclassifications	0	'	'
Amounts reclassified from accumulated other comprehensive loss	0	'	'
Net current period other comprehensive loss	0	'	'
Ending Balance	$0.40	'	'

Changes_in_Accumulated_Other_C3

Changes in Accumulated Other Comprehensive Loss Reclassifications from Accumulated Other Comprehensive loss (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]	'	'	'
Restructuring, asset impairments and other, net	$33.20	$165.30	$102.70
Other income and expense	3.1	5.8	-8.9
Net income (loss)	154	-86.3	14.9
Reclassification out of Accumulated Other Comprehensive Income [Member]	'	'	'
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]	'	'	'
Net income (loss)	-23.5	'	'
Accumulated Translation Adjustment [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]	'	'	'
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]	'	'	'
Restructuring, asset impairments and other, net	-21	'	'
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]	'	'	'
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]	'	'	'
Other income and expense	($2.50)	'	'

Changes_in_Accumulated_Other_C4

Changes in Accumulated Other Comprehensive Loss Narrative (Details) (USD $)	12 Months Ended				9 Months Ended	12 Months Ended	9 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013	Sep. 27, 2013	Dec. 31, 2013	Sep. 27, 2013
				Accumulated Translation Adjustment [Member]	Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]	Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]	Reclassification out of Accumulated Other Comprehensive Income [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]	'	'	'	'	'	'	'
Income Tax Expense (Benefit)	$26,900,000	$13,400,000	$22,900,000	'	'	'	$0
Amounts reclassified from accumulated other comprehensive loss	-23,500,000	'	'	-21,000,000	'	-2,500,000	'
Reclassification from accumulated other comprehensive loss, tax	'	'	'	'	$0	'	'

Supplemental_Disclosures_NonCa

Supplemental Disclosures (Non-Cash Financing Activities And Cash Payments) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Non-cash financing activities:	'	'	'
Capital expenditures in accounts payable	$55.80	$54.40	$58.80
Equipment acquired or refinanced through capital leases	3.8	31	24.9
Cash (received) paid for:	'	'	'
Interest income	-1.3	-1.5	-1.1
Interest expense	24.8	30.4	31.8
Income taxes	12.9	17.6	20.4
Income form business interruption insurance proceeds	13.5	16.4	'
Insurance Recoveries	'	11.5	13.3
Gain (Loss) on Sale of Insurance Block	$0	$0	$23.90

Segment_Information_Narrative_

Segment Information (Narrative) (Details)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
	Individual	Customer	Individual	Individual
	segment	segment
Segment Reporting, Measurement Disclosures [Abstract]	'	'	'	'
Number of reporting segments	3	3	'	'
Number of customers individually accounting for more than 10% of total revenue	0	0	0	0
Percentage of total revenue	10.00%	10.00%	10.00%	10.00%

Segment_Information_Segment_In

Segment Information (Segment Information Of Revenues, Gross Profit And Operating Income) (Details) (USD $)	3 Months Ended								12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Sep. 27, 2013	Jun. 28, 2013	Mar. 29, 2013	Dec. 31, 2012	Sep. 28, 2012	Jun. 29, 2012	Mar. 30, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Revenues from external customers	$718	$715.40	$688.30	$661	$680.20	$725.50	$744.80	$744.40	$2,782.70	$2,894.90	$3,442.30
Segment gross profit	'	'	'	'	'	'	'	'	949.7	1,003.20	1,063.80
Segment operating income (loss)	'	'	'	'	'	'	'	'	272.5	259.4	286
Application Products Group [Member]	'	'	'	'	'	'	'	'	'	'	'
Revenues from external customers	'	'	'	'	'	'	'	'	1,036.30	1,019.20	1,145.50
Segment gross profit	'	'	'	'	'	'	'	'	455.6	459.2	549
Segment operating income (loss)	'	'	'	'	'	'	'	'	110.6	111.2	190.8
Standard Products Group [Member]	'	'	'	'	'	'	'	'	'	'	'
Revenues from external customers	'	'	'	'	'	'	'	'	1,121.20	1,104.70	1,236.50
Segment gross profit	'	'	'	'	'	'	'	'	390.7	400.9	435.7
Segment operating income (loss)	'	'	'	'	'	'	'	'	228.2	240	254.6
System Solutions Group [Member]	'	'	'	'	'	'	'	'	'	'	'
Revenues from external customers	'	'	'	'	'	'	'	'	625.2	771	1,060.30
Segment gross profit	'	'	'	'	'	'	'	'	103.4	143.1	79.1
Segment operating income (loss)	'	'	'	'	'	'	'	'	($66.30)	($91.80)	($159.40)

Segment_Information_Reconcilia

Segment Information (Reconciliations Of Segment Gross Profit And Segment Operating Income) (Details) (USD $)	3 Months Ended								12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Sep. 27, 2013	Jun. 28, 2013	Mar. 29, 2013	Dec. 31, 2012	Sep. 28, 2012	Jun. 29, 2012	Mar. 30, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Gross profit for reportable segments	'	'	'	'	'	'	'	'	$949.70	$1,003.20	$1,063.80
Gross Profit	252.9	249.2	231.8	204.5	210.4	238	258.3	245.2	938.4	951.9	1,008.80
Operating income for reportable segments	'	'	'	'	'	'	'	'	272.5	259.4	286
Goodwill and intangible impairment	'	'	'	'	'	'	'	'	0	-49.5	0
Other unallocated operating expenses	'	'	'	'	'	'	'	'	-720.2	-968.2	-895.4
Operating income (loss)	'	'	'	'	'	'	'	'	218.2	-16.3	113.4
Significant Reconciling Items	'	'	'	'	'	'	'	'	'	'	'
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Other unallocated manufacturing costs	'	'	'	'	'	'	'	'	-11.3	-51.3	-55
Gross Profit	'	'	'	'	'	'	'	'	938.4	951.9	1,008.80
Restructuring and other charges	'	'	'	'	'	'	'	'	-33.2	-165.3	-102.7
Goodwill and intangible impairment	'	'	'	'	'	'	'	'	0	-49.5	0
Other unallocated manufacturing costs	'	'	'	'	'	'	'	'	-11.3	-51.3	-55
Other unallocated operating expenses	'	'	'	'	'	'	'	'	($9.80)	($9.60)	($14.90)

Segment_Information_Revenues_B

Segment Information (Revenues By Geographic Location Including Local Sales And Exports) (Details) (USD $)	3 Months Ended								12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Sep. 27, 2013	Jun. 28, 2013	Mar. 29, 2013	Dec. 31, 2012	Sep. 28, 2012	Jun. 29, 2012	Mar. 30, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Revenues	$718	$715.40	$688.30	$661	$680.20	$725.50	$744.80	$744.40	$2,782.70	$2,894.90	$3,442.30
United States	'	'	'	'	'	'	'	'	'	'	'
Revenues	'	'	'	'	'	'	'	'	415.4	452	524
United Kingdom	'	'	'	'	'	'	'	'	'	'	'
Revenues	'	'	'	'	'	'	'	'	400.2	388.3	424.7
China	'	'	'	'	'	'	'	'	'	'	'
Revenues	'	'	'	'	'	'	'	'	862.4	874.2	1,053.80
Japan	'	'	'	'	'	'	'	'	'	'	'
Revenues	'	'	'	'	'	'	'	'	290.2	401.2	494.8
Singapore	'	'	'	'	'	'	'	'	'	'	'
Revenues	'	'	'	'	'	'	'	'	700.6	627.7	683.3
Other	'	'	'	'	'	'	'	'	'	'	'
Revenues	'	'	'	'	'	'	'	'	$113.90	$151.50	$261.70

Segment_Information_Summary_Of

Segment Information (Summary Of Property, Plant And Equipment By Geographic Location) (Details) (USD $)	Dec. 31, 2013		Dec. 31, 2012	Dec. 31, 2011
In Millions, unless otherwise specified
Property, plant and equipment, net	$1,074.20	[1]	$1,103.30	$1,109.50
United States	'		'	'
Property, plant and equipment, net	255.3		274.7	257.5
Czech Republic	'		'	'
Property, plant and equipment, net	111.1		118	91.6
Malaysia	'		'	'
Property, plant and equipment, net	213.9		185	164.5
Philippines	'		'	'
Property, plant and equipment, net	173.8		188.8	204
Japan	'		'	'
Property, plant and equipment, net	61.3		78.9	130.2
Other	'		'	'
Property, plant and equipment, net	$258.80		$257.90	$261.70
[1]	Included in property, plant and equipment are $8.7 million of fixed assets that are held-for-sale as of December 31, 2013.

Supplementary_Data_Selected_Qu

Supplementary Data Selected Quarterly Data (Details) (USD $)	3 Months Ended								12 Months Ended
In Millions, except Per Share data, unless otherwise specified	Dec. 31, 2013	Sep. 27, 2013	Jun. 28, 2013	Mar. 29, 2013	Dec. 31, 2012	Sep. 28, 2012	Jun. 29, 2012	Mar. 30, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Revenues	$718	$715.40	$688.30	$661	$680.20	$725.50	$744.80	$744.40	$2,782.70	$2,894.90	$3,442.30
Gross Profit	252.9	249.2	231.8	204.5	210.4	238	258.3	245.2	938.4	951.9	1,008.80
Net income attributable to ON Semiconductor Corporation (1)	28.7	51.8	47.7	22.6	-138.2	12.5	6.9	28.2	150.8	-90.6	11.6
Diluted net income per common share attributable to ON Semiconductor Corporation (dollars per common share)	$0.06	$0.11	$0.11	$0.05	($0.31)	$0.03	$0.02	$0.06	$0.33	($0.20)	$0.03
Restructuring, asset impairments and other, net	'	'	'	'	'	'	'	'	33.2	165.3	102.7
Parent [Member]	'	'	'	'	'	'	'	'	'	'	'
Restructuring, asset impairments and other, net	'	'	'	'	'	'	'	'	$22.10	$108	'

Guarantor_And_NonGuarantor_Sta1

Guarantor And Non-Guarantor Statements Guarantor And Non-Guarantor Statements (Narrative) (Details)	Dec. 31, 2013
Guarantor And Non-Guarantor Statements [Abstract]	'
Ownership percentage of wholly owned domestic subsidiary	100.00%

Guarantor_And_NonGuarantor_Sta2

Guarantor And Non-Guarantor Statements (Notes To Consolidated Statement Of Balance Sheet) (Details) (USD $)	Dec. 31, 2013		Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Condensed Financial Statements, Captions [Line Items]	'		'	'	'
Cash and cash equivalents	$509,500,000		$486,900,000	$652,900,000	$623,300,000
Short-term investments	116,200,000		144,800,000	'	'
Receivables, net	383,400,000		357,800,000	'	'
Inventories	611,800,000		581,700,000	'	'
Short-term intercompany receivables	0		0	'	'
Other current assets	89,300,000		122,200,000	'	'
Total current assets	1,710,200,000		1,693,400,000	'	'
Property, plant and equipment, net	1,074,200,000	[1]	1,103,300,000	1,109,500,000	'
Goodwill	184,600,000		184,600,000	198,700,000	'
Intangible assets, net	223,400,000		257,000,000	'	'
Long-term intercompany receivables	0		0	'	'
Other assets	64,600,000		90,100,000	'	'
Total assets	3,257,000,000		3,328,400,000	'	'
Accounts payable	276,800,000		279,500,000	'	'
Accrued expenses	220,300,000		256,700,000	'	'
Deferred income on sales to distributors	140,500,000		134,500,000	'	'
Current portion of long-term debt	181,600,000		353,600,000	'	'
Short-term intercompany payables	0		0	'	'
Total current liabilities	819,200,000		1,024,300,000	'	'
Long-term debt	760,600,000		658,300,000	'	'
Other long-term liabilities	190,400,000		255,100,000	'	'
Long-term intercompany payables	0		0	'	'
Total liabilities	1,770,200,000		1,937,700,000	'	'
Common stock	5,200,000		5,100,000	'	'
Additional paid-in capital	3,210,800,000		3,156,400,000	'	'
Accumulated other comprehensive loss	-47,400,000		-41,100,000	'	'
Accumulated deficit	-1,142,100,000		-1,292,900,000	'	'
Less: treasury stock, at cost	-572,500,000		-466,400,000	'	'
Total ON Semiconductor Corporation stockholders’ equity	1,454,000,000		1,361,100,000	'	'
Non-controlling interest in consolidated subsidiary	32,800,000		29,600,000	25,300,000	'
Total stockholders' equity	1,486,800,000		1,390,700,000	1,493,500,000	1,388,000,000
Total liabilities and equity	3,257,000,000		3,328,400,000	'	'
Issuer [Member]	'		'	'	'
Condensed Financial Statements, Captions [Line Items]	'		'	'	'
Cash and cash equivalents	0		0	0	0
Short-term investments	0		0	'	'
Receivables, net	0		0	'	'
Inventories	0		0	'	'
Short-term intercompany receivables	0		0	'	'
Other current assets	0		0	'	'
Total current assets	0		0	'	'
Property, plant and equipment, net	0		0	'	'
Goodwill	0		0	'	'
Intangible assets, net	0		0	'	'
Long-term intercompany receivables	0		0	'	'
Other assets	1,790,200,000		1,834,600,000	'	'
Total assets	1,790,200,000		1,834,600,000	'	'
Accounts payable	0		0	'	'
Accrued expenses	1,000,000		500,000	'	'
Deferred income on sales to distributors	0		0	'	'
Current portion of long-term debt	0		198,900,000	'	'
Short-term intercompany payables	0		0	'	'
Total current liabilities	1,000,000		199,400,000	'	'
Long-term debt	335,200,000		274,100,000	'	'
Other long-term liabilities	0		0	'	'
Long-term intercompany payables	0		0	'	'
Total liabilities	336,200,000		473,500,000	'	'
Common stock	5,200,000		5,100,000	'	'
Additional paid-in capital	3,210,800,000		3,156,400,000	'	'
Accumulated other comprehensive loss	-47,400,000		-41,100,000	'	'
Accumulated deficit	-1,142,100,000		-1,292,900,000	'	'
Less: treasury stock, at cost	-572,500,000		-466,400,000	'	'
Total ON Semiconductor Corporation stockholders’ equity	1,454,000,000		1,361,100,000	'	'
Non-controlling interest in consolidated subsidiary	0		0	'	'
Total stockholders' equity	1,454,000,000		1,361,100,000	'	'
Total liabilities and equity	1,790,200,000		1,834,600,000	'	'
SCI LLC [Member]	'		'	'	'
Condensed Financial Statements, Captions [Line Items]	'		'	'	'
Cash and cash equivalents	267,900,000		212,100,000	304,500,000	392,300,000
Short-term investments	116,200,000		144,800,000	'	'
Receivables, net	49,800,000		45,400,000	'	'
Inventories	46,700,000		34,500,000	'	'
Short-term intercompany receivables	0		0	'	'
Other current assets	17,800,000		12,900,000	'	'
Total current assets	498,400,000		449,700,000	'	'
Property, plant and equipment, net	252,300,000		272,000,000	'	'
Goodwill	111,500,000		111,700,000	'	'
Intangible assets, net	113,000,000		128,200,000	'	'
Long-term intercompany receivables	0		166,300,000	'	'
Other assets	1,600,600,000		1,431,500,000	'	'
Total assets	2,575,800,000		2,559,400,000	'	'
Accounts payable	39,100,000		24,100,000	'	'
Accrued expenses	50,800,000		53,000,000	'	'
Deferred income on sales to distributors	32,300,000		34,200,000	'	'
Current portion of long-term debt	79,300,000		80,200,000	'	'
Short-term intercompany payables	11,700,000		20,400,000	'	'
Total current liabilities	213,200,000		211,900,000	'	'
Long-term debt	396,100,000		344,100,000	'	'
Other long-term liabilities	42,200,000		29,900,000	'	'
Long-term intercompany payables	3,300,000		0	'	'
Total liabilities	654,800,000		585,900,000	'	'
Common stock	300,000		300,000	'	'
Additional paid-in capital	2,335,100,000		2,549,300,000	'	'
Accumulated other comprehensive loss	-49,200,000		-41,000,000	'	'
Accumulated deficit	-365,200,000		-535,100,000	'	'
Less: treasury stock, at cost	0		0	'	'
Total ON Semiconductor Corporation stockholders’ equity	1,921,000,000		1,973,500,000	'	'
Non-controlling interest in consolidated subsidiary	0		0	'	'
Total stockholders' equity	1,921,000,000		1,973,500,000	'	'
Total liabilities and equity	2,575,800,000		2,559,400,000	'	'
Other Subsidiaries [Member]	'		'	'	'
Condensed Financial Statements, Captions [Line Items]	'		'	'	'
Cash and cash equivalents	0		0	-200,000	0
Short-term investments	0		0	'	'
Receivables, net	0		0	'	'
Inventories	0		0	'	'
Short-term intercompany receivables	4,100,000		3,300,000	'	'
Other current assets	0		0	'	'
Total current assets	4,100,000		3,300,000	'	'
Property, plant and equipment, net	3,100,000		2,800,000	'	'
Goodwill	37,300,000		37,200,000	'	'
Intangible assets, net	0		0	'	'
Long-term intercompany receivables	0		0	'	'
Other assets	136,100,000		129,500,000	'	'
Total assets	180,600,000		172,800,000	'	'
Accounts payable	500,000		0	'	'
Accrued expenses	200,000		900,000	'	'
Deferred income on sales to distributors	0		0	'	'
Current portion of long-term debt	0		100,000	'	'
Short-term intercompany payables	0		0	'	'
Total current liabilities	700,000		1,000,000	'	'
Long-term debt	0		0	'	'
Other long-term liabilities	100,000		300,000	'	'
Long-term intercompany payables	0		0	'	'
Total liabilities	800,000		1,300,000	'	'
Common stock	50,900,000		50,900,000	'	'
Additional paid-in capital	259,800,000		259,200,000	'	'
Accumulated other comprehensive loss	0		0	'	'
Accumulated deficit	-130,900,000		-138,600,000	'	'
Less: treasury stock, at cost	0		0	'	'
Total ON Semiconductor Corporation stockholders’ equity	179,800,000		171,500,000	'	'
Non-controlling interest in consolidated subsidiary	0		0	'	'
Total stockholders' equity	179,800,000		171,500,000	'	'
Total liabilities and equity	180,600,000		172,800,000	'	'
Non-Guarantor Subsidiaries [Member]	'		'	'	'
Condensed Financial Statements, Captions [Line Items]	'		'	'	'
Cash and cash equivalents	241,600,000		274,800,000	348,600,000	231,000,000
Short-term investments	0		0	'	'
Receivables, net	333,600,000		312,400,000	'	'
Inventories	562,100,000		578,400,000	'	'
Short-term intercompany receivables	7,600,000		17,200,000	'	'
Other current assets	71,500,000		109,300,000	'	'
Total current assets	1,216,400,000		1,292,100,000	'	'
Property, plant and equipment, net	820,600,000		830,900,000	'	'
Goodwill	35,800,000		35,700,000	'	'
Intangible assets, net	132,200,000		154,700,000	'	'
Long-term intercompany receivables	3,300,000		0	'	'
Other assets	837,300,000		846,200,000	'	'
Total assets	3,045,600,000		3,159,600,000	'	'
Accounts payable	237,200,000		255,400,000	'	'
Accrued expenses	168,300,000		177,800,000	'	'
Deferred income on sales to distributors	108,200,000		100,300,000	'	'
Current portion of long-term debt	102,300,000		74,400,000	'	'
Short-term intercompany payables	0		100,000	'	'
Total current liabilities	616,000,000		608,000,000	'	'
Long-term debt	29,300,000		40,100,000	'	'
Other long-term liabilities	148,100,000		224,900,000	'	'
Long-term intercompany payables	0		166,300,000	'	'
Total liabilities	793,400,000		1,039,300,000	'	'
Common stock	201,600,000		201,600,000	'	'
Additional paid-in capital	1,402,600,000		1,402,900,000	'	'
Accumulated other comprehensive loss	-38,600,000		-34,600,000	'	'
Accumulated deficit	686,600,000		550,400,000	'	'
Less: treasury stock, at cost	0		0	'	'
Total ON Semiconductor Corporation stockholders’ equity	2,252,200,000		2,120,300,000	'	'
Non-controlling interest in consolidated subsidiary	0		0	'	'
Total stockholders' equity	2,252,200,000		2,120,300,000	'	'
Total liabilities and equity	3,045,600,000		3,159,600,000	'	'
Eliminations [Member]	'		'	'	'
Condensed Financial Statements, Captions [Line Items]	'		'	'	'
Cash and cash equivalents	0		0	0	0
Short-term investments	0		0	'	'
Receivables, net	0		0	'	'
Inventories	3,000,000		-31,200,000	'	'
Short-term intercompany receivables	-11,700,000		-20,500,000	'	'
Other current assets	0		0	'	'
Total current assets	-8,700,000		-51,700,000	'	'
Property, plant and equipment, net	-1,800,000		-2,400,000	'	'
Goodwill	0		0	'	'
Intangible assets, net	-21,800,000		-25,900,000	'	'
Long-term intercompany receivables	-3,300,000		-166,300,000	'	'
Other assets	-4,299,600,000		-4,151,700,000	'	'
Total assets	-4,335,200,000		-4,398,000,000	'	'
Accounts payable	0		0	'	'
Accrued expenses	0		24,500,000	'	'
Deferred income on sales to distributors	0		0	'	'
Current portion of long-term debt	0		0	'	'
Short-term intercompany payables	-11,700,000		-20,500,000	'	'
Total current liabilities	-11,700,000		4,000,000	'	'
Long-term debt	0		0	'	'
Other long-term liabilities	0		0	'	'
Long-term intercompany payables	-3,300,000		-166,300,000	'	'
Total liabilities	-15,000,000		-162,300,000	'	'
Common stock	-252,800,000		-252,800,000	'	'
Additional paid-in capital	-3,997,500,000		-4,211,400,000	'	'
Accumulated other comprehensive loss	87,800,000		75,600,000	'	'
Accumulated deficit	-190,500,000		123,300,000	'	'
Less: treasury stock, at cost	0		0	'	'
Total ON Semiconductor Corporation stockholders’ equity	-4,353,000,000		-4,265,300,000	'	'
Non-controlling interest in consolidated subsidiary	32,800,000		29,600,000	'	'
Total stockholders' equity	-4,320,200,000		-4,235,700,000	'	'
Total liabilities and equity	($4,335,200,000)		($4,398,000,000)	'	'
[1]	Included in property, plant and equipment are $8.7 million of fixed assets that are held-for-sale as of December 31, 2013.

Guarantor_And_NonGuarantor_Sta3

Guarantor And Non-Guarantor Statements (Notes To Consolidated Statement Of Operations) (Details) (USD $)	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 27, 2013	Jun. 28, 2013	Mar. 29, 2013	Dec. 31, 2012	Sep. 28, 2012	Jun. 29, 2012	Mar. 30, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Condensed Financial Statements, Captions [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Revenues	$718,000,000	$715,400,000	$688,300,000	$661,000,000	$680,200,000	$725,500,000	$744,800,000	$744,400,000	$2,782,700,000	$2,894,900,000	$3,442,300,000
Cost of revenues	'	'	'	'	'	'	'	'	1,844,300,000	1,943,000,000	2,433,500,000
Gross profit	252,900,000	249,200,000	231,800,000	204,500,000	210,400,000	238,000,000	258,300,000	245,200,000	938,400,000	951,900,000	1,008,800,000
Operating expenses:	'	'	'	'	'	'	'	'	'	'	'
Research and development	'	'	'	'	'	'	'	'	334,200,000	367,500,000	362,500,000
Selling and marketing	'	'	'	'	'	'	'	'	171,200,000	180,900,000	195,100,000
General and administrative	'	'	'	'	'	'	'	'	148,500,000	160,600,000	192,400,000
Amortization of acquisition-related intangible assets	'	'	'	'	'	'	'	'	33,100,000	44,400,000	42,700,000
Restructuring, asset impairments and other, net	'	'	'	'	'	'	'	'	33,200,000	165,300,000	102,700,000
Goodwill and intangible asset impairment	'	'	'	'	'	'	'	'	0	49,500,000	0
Total operating expenses	'	'	'	'	'	'	'	'	720,200,000	968,200,000	895,400,000
Operating income (loss)	'	'	'	'	'	'	'	'	218,200,000	-16,300,000	113,400,000
Other income (expenses), net:	'	'	'	'	'	'	'	'	'	'	'
Interest expense	'	'	'	'	'	'	'	'	-38,600,000	-56,100,000	-68,900,000
Interest income	'	'	'	'	'	'	'	'	1,300,000	1,500,000	1,100,000
Other	'	'	'	'	'	'	'	'	3,100,000	5,800,000	-8,900,000
Loss on debt repurchase or exchange	'	'	'	'	'	'	'	'	-3,100,000	-7,800,000	-23,200,000
Gain on System Solutions Semiconductor acquisition	'	'	'	'	'	'	'	'	0	0	24,300,000
Equity in earnings	'	'	'	'	'	'	'	'	0	0	0
Other income (expenses), net	'	'	'	'	'	'	'	'	-37,300,000	-56,600,000	-75,600,000
Income (loss) before income taxes	'	'	'	'	'	'	'	'	180,900,000	-72,900,000	37,800,000
Income tax provision	'	'	'	'	'	'	'	'	-26,900,000	-13,400,000	-22,900,000
Net income (loss)	'	'	'	'	'	'	'	'	154,000,000	-86,300,000	14,900,000
Net income attributable to non-controlling interest	'	'	'	'	'	'	'	'	-3,200,000	-4,300,000	-3,300,000
Net income (loss) attributable to ON Semiconductor Corporation	28,700,000	51,800,000	47,700,000	22,600,000	-138,200,000	12,500,000	6,900,000	28,200,000	150,800,000	-90,600,000	11,600,000
Comprehensive income attributed to ON Semiconductor Corporation	'	'	'	'	'	'	'	'	144,500,000	-85,000,000	24,000,000
Issuer [Member]	'	'	'	'	'	'	'	'	'	'	'
Condensed Financial Statements, Captions [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Revenues	'	'	'	'	'	'	'	'	0	0	0
Cost of revenues	'	'	'	'	'	'	'	'	0	0	0
Gross profit	'	'	'	'	'	'	'	'	0	0	0
Operating expenses:	'	'	'	'	'	'	'	'	'	'	'
Research and development	'	'	'	'	'	'	'	'	0	0	0
Selling and marketing	'	'	'	'	'	'	'	'	0	0	0
General and administrative	'	'	'	'	'	'	'	'	0	0	0
Amortization of acquisition-related intangible assets	'	'	'	'	'	'	'	'	0	0	0
Restructuring, asset impairments and other, net	'	'	'	'	'	'	'	'	0	0	0
Goodwill and intangible asset impairment	'	'	'	'	'	'	'	'	'	0	'
Total operating expenses	'	'	'	'	'	'	'	'	0	0	0
Operating income (loss)	'	'	'	'	'	'	'	'	0	0	0
Other income (expenses), net:	'	'	'	'	'	'	'	'	'	'	'
Interest expense	'	'	'	'	'	'	'	'	-23,000,000	-38,000,000	-50,800,000
Interest income	'	'	'	'	'	'	'	'	0	0	0
Other	'	'	'	'	'	'	'	'	0	0	0
Loss on debt repurchase or exchange	'	'	'	'	'	'	'	'	-3,100,000	-7,800,000	-23,200,000
Gain on System Solutions Semiconductor acquisition	'	'	'	'	'	'	'	'	'	'	-100,000
Equity in earnings	'	'	'	'	'	'	'	'	176,900,000	-44,800,000	85,700,000
Other income (expenses), net	'	'	'	'	'	'	'	'	150,800,000	-90,600,000	11,600,000
Income (loss) before income taxes	'	'	'	'	'	'	'	'	150,800,000	-90,600,000	11,600,000
Income tax provision	'	'	'	'	'	'	'	'	0	0	0
Net income (loss)	'	'	'	'	'	'	'	'	150,800,000	-90,600,000	11,600,000
Net income attributable to non-controlling interest	'	'	'	'	'	'	'	'	0	0	0
Net income (loss) attributable to ON Semiconductor Corporation	'	'	'	'	'	'	'	'	150,800,000	-90,600,000	11,600,000
Comprehensive income attributed to ON Semiconductor Corporation	'	'	'	'	'	'	'	'	144,500,000	-85,000,000	24,000,000
SCI LLC [Member]	'	'	'	'	'	'	'	'	'	'	'
Condensed Financial Statements, Captions [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Revenues	'	'	'	'	'	'	'	'	684,200,000	732,200,000	788,900,000
Cost of revenues	'	'	'	'	'	'	'	'	516,400,000	468,100,000	531,500,000
Gross profit	'	'	'	'	'	'	'	'	167,800,000	264,100,000	257,400,000
Operating expenses:	'	'	'	'	'	'	'	'	'	'	'
Research and development	'	'	'	'	'	'	'	'	77,200,000	180,300,000	167,600,000
Selling and marketing	'	'	'	'	'	'	'	'	71,400,000	68,200,000	70,400,000
General and administrative	'	'	'	'	'	'	'	'	32,600,000	5,000,000	84,000,000
Amortization of acquisition-related intangible assets	'	'	'	'	'	'	'	'	15,200,000	18,100,000	18,000,000
Restructuring, asset impairments and other, net	'	'	'	'	'	'	'	'	1,200,000	3,300,000	3,400,000
Goodwill and intangible asset impairment	'	'	'	'	'	'	'	'	'	20,100,000	'
Total operating expenses	'	'	'	'	'	'	'	'	197,600,000	295,000,000	343,400,000
Operating income (loss)	'	'	'	'	'	'	'	'	-29,800,000	-30,900,000	-86,000,000
Other income (expenses), net:	'	'	'	'	'	'	'	'	'	'	'
Interest expense	'	'	'	'	'	'	'	'	-10,500,000	-9,000,000	-8,500,000
Interest income	'	'	'	'	'	'	'	'	400,000	800,000	400,000
Other	'	'	'	'	'	'	'	'	-11,500,000	11,700,000	-3,100,000
Loss on debt repurchase or exchange	'	'	'	'	'	'	'	'	0	0	0
Gain on System Solutions Semiconductor acquisition	'	'	'	'	'	'	'	'	'	'	24,400,000
Equity in earnings	'	'	'	'	'	'	'	'	232,600,000	-25,600,000	151,600,000
Other income (expenses), net	'	'	'	'	'	'	'	'	211,000,000	-22,100,000	164,800,000
Income (loss) before income taxes	'	'	'	'	'	'	'	'	181,200,000	-53,000,000	78,800,000
Income tax provision	'	'	'	'	'	'	'	'	-11,400,000	-1,800,000	1,500,000
Net income (loss)	'	'	'	'	'	'	'	'	169,800,000	-54,800,000	80,300,000
Net income attributable to non-controlling interest	'	'	'	'	'	'	'	'	0	0	0
Net income (loss) attributable to ON Semiconductor Corporation	'	'	'	'	'	'	'	'	169,800,000	-54,800,000	80,300,000
Comprehensive income attributed to ON Semiconductor Corporation	'	'	'	'	'	'	'	'	161,400,000	-49,200,000	92,600,000
Other Subsidiaries [Member]	'	'	'	'	'	'	'	'	'	'	'
Condensed Financial Statements, Captions [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Revenues	'	'	'	'	'	'	'	'	13,800,000	12,900,000	13,900,000
Cost of revenues	'	'	'	'	'	'	'	'	600,000	600,000	800,000
Gross profit	'	'	'	'	'	'	'	'	13,200,000	12,300,000	13,100,000
Operating expenses:	'	'	'	'	'	'	'	'	'	'	'
Research and development	'	'	'	'	'	'	'	'	10,900,000	10,300,000	10,700,000
Selling and marketing	'	'	'	'	'	'	'	'	700,000	800,000	1,000,000
General and administrative	'	'	'	'	'	'	'	'	800,000	600,000	700,000
Amortization of acquisition-related intangible assets	'	'	'	'	'	'	'	'	0	0	0
Restructuring, asset impairments and other, net	'	'	'	'	'	'	'	'	0	100,000	0
Goodwill and intangible asset impairment	'	'	'	'	'	'	'	'	'	0	'
Total operating expenses	'	'	'	'	'	'	'	'	12,400,000	11,800,000	12,400,000
Operating income (loss)	'	'	'	'	'	'	'	'	800,000	500,000	700,000
Other income (expenses), net:	'	'	'	'	'	'	'	'	'	'	'
Interest expense	'	'	'	'	'	'	'	'	0	0	0
Interest income	'	'	'	'	'	'	'	'	0	0	0
Other	'	'	'	'	'	'	'	'	0	0	0
Loss on debt repurchase or exchange	'	'	'	'	'	'	'	'	0	0	0
Gain on System Solutions Semiconductor acquisition	'	'	'	'	'	'	'	'	'	'	0
Equity in earnings	'	'	'	'	'	'	'	'	7,400,000	10,000,000	7,700,000
Other income (expenses), net	'	'	'	'	'	'	'	'	7,400,000	10,000,000	7,700,000
Income (loss) before income taxes	'	'	'	'	'	'	'	'	8,200,000	10,500,000	8,400,000
Income tax provision	'	'	'	'	'	'	'	'	0	0	0
Net income (loss)	'	'	'	'	'	'	'	'	8,200,000	10,500,000	8,400,000
Net income attributable to non-controlling interest	'	'	'	'	'	'	'	'	0	0	0
Net income (loss) attributable to ON Semiconductor Corporation	'	'	'	'	'	'	'	'	8,200,000	10,500,000	8,400,000
Comprehensive income attributed to ON Semiconductor Corporation	'	'	'	'	'	'	'	'	8,200,000	10,500,000	8,400,000
Non-Guarantor Subsidiaries [Member]	'	'	'	'	'	'	'	'	'	'	'
Condensed Financial Statements, Captions [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Revenues	'	'	'	'	'	'	'	'	4,142,300,000	3,760,900,000	3,985,700,000
Cost of revenues	'	'	'	'	'	'	'	'	3,419,100,000	3,052,300,000	3,236,400,000
Gross profit	'	'	'	'	'	'	'	'	723,200,000	708,600,000	749,300,000
Operating expenses:	'	'	'	'	'	'	'	'	'	'	'
Research and development	'	'	'	'	'	'	'	'	246,100,000	176,900,000	184,200,000
Selling and marketing	'	'	'	'	'	'	'	'	99,100,000	111,900,000	123,700,000
General and administrative	'	'	'	'	'	'	'	'	115,100,000	155,000,000	107,700,000
Amortization of acquisition-related intangible assets	'	'	'	'	'	'	'	'	22,100,000	30,500,000	28,800,000
Restructuring, asset impairments and other, net	'	'	'	'	'	'	'	'	32,000,000	161,900,000	99,300,000
Goodwill and intangible asset impairment	'	'	'	'	'	'	'	'	'	29,400,000	'
Total operating expenses	'	'	'	'	'	'	'	'	514,400,000	665,600,000	543,700,000
Operating income (loss)	'	'	'	'	'	'	'	'	208,800,000	43,000,000	205,600,000
Other income (expenses), net:	'	'	'	'	'	'	'	'	'	'	'
Interest expense	'	'	'	'	'	'	'	'	-5,100,000	-9,100,000	-9,600,000
Interest income	'	'	'	'	'	'	'	'	900,000	700,000	700,000
Other	'	'	'	'	'	'	'	'	14,600,000	-5,900,000	-5,800,000
Loss on debt repurchase or exchange	'	'	'	'	'	'	'	'	0	0	0
Gain on System Solutions Semiconductor acquisition	'	'	'	'	'	'	'	'	'	'	0
Equity in earnings	'	'	'	'	'	'	'	'	0	0	0
Other income (expenses), net	'	'	'	'	'	'	'	'	10,400,000	-14,300,000	-14,700,000
Income (loss) before income taxes	'	'	'	'	'	'	'	'	219,200,000	28,700,000	190,900,000
Income tax provision	'	'	'	'	'	'	'	'	-15,500,000	-11,600,000	-24,400,000
Net income (loss)	'	'	'	'	'	'	'	'	203,700,000	17,100,000	166,500,000
Net income attributable to non-controlling interest	'	'	'	'	'	'	'	'	0	0	0
Net income (loss) attributable to ON Semiconductor Corporation	'	'	'	'	'	'	'	'	203,700,000	17,100,000	166,500,000
Comprehensive income attributed to ON Semiconductor Corporation	'	'	'	'	'	'	'	'	200,100,000	21,400,000	178,900,000
Eliminations [Member]	'	'	'	'	'	'	'	'	'	'	'
Condensed Financial Statements, Captions [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Revenues	'	'	'	'	'	'	'	'	-2,057,600,000	-1,611,100,000	-1,346,200,000
Cost of revenues	'	'	'	'	'	'	'	'	-2,091,800,000	-1,578,000,000	-1,335,200,000
Gross profit	'	'	'	'	'	'	'	'	34,200,000	-33,100,000	-11,000,000
Operating expenses:	'	'	'	'	'	'	'	'	'	'	'
Research and development	'	'	'	'	'	'	'	'	0	0	0
Selling and marketing	'	'	'	'	'	'	'	'	0	0	0
General and administrative	'	'	'	'	'	'	'	'	0	0	0
Amortization of acquisition-related intangible assets	'	'	'	'	'	'	'	'	-4,200,000	-4,200,000	-4,100,000
Restructuring, asset impairments and other, net	'	'	'	'	'	'	'	'	0	0	0
Goodwill and intangible asset impairment	'	'	'	'	'	'	'	'	'	0	'
Total operating expenses	'	'	'	'	'	'	'	'	-4,200,000	-4,200,000	-4,100,000
Operating income (loss)	'	'	'	'	'	'	'	'	38,400,000	-28,900,000	-6,900,000
Other income (expenses), net:	'	'	'	'	'	'	'	'	'	'	'
Interest expense	'	'	'	'	'	'	'	'	0	0	0
Interest income	'	'	'	'	'	'	'	'	0	0	0
Other	'	'	'	'	'	'	'	'	0	0	0
Loss on debt repurchase or exchange	'	'	'	'	'	'	'	'	0	0	0
Gain on System Solutions Semiconductor acquisition	'	'	'	'	'	'	'	'	'	'	0
Equity in earnings	'	'	'	'	'	'	'	'	-416,900,000	60,400,000	-245,000,000
Other income (expenses), net	'	'	'	'	'	'	'	'	-416,900,000	60,400,000	-245,000,000
Income (loss) before income taxes	'	'	'	'	'	'	'	'	-378,500,000	31,500,000	-251,900,000
Income tax provision	'	'	'	'	'	'	'	'	0	0	0
Net income (loss)	'	'	'	'	'	'	'	'	-378,500,000	31,500,000	-251,900,000
Net income attributable to non-controlling interest	'	'	'	'	'	'	'	'	-3,200,000	-4,300,000	-3,300,000
Net income (loss) attributable to ON Semiconductor Corporation	'	'	'	'	'	'	'	'	-381,700,000	27,200,000	-255,200,000
Comprehensive income attributed to ON Semiconductor Corporation	'	'	'	'	'	'	'	'	($369,700,000)	$17,300,000	($279,900,000)

Guarantor_And_NonGuarantor_Sta4

Guarantor And Non-Guarantor Statements Guarantor And Non-Guarantor Statements (Notes To Consolidated Statement Of Cash Flows) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Condensed Financial Statements, Captions [Line Items]	'	'	'
Net cash provided by operating activities	$327.30	$276	$545.50
Cash flows from investing activities:	'	'	'
Purchases of property, plant and equipment	-155.2	-256.3	-316.4
Proceeds from sales of property, plant and equipment	9.7	6.2	3.3
Deposits made for purchases of property, plant and equipment	-1.3	1.4	0.5
Recovery from insurance on property, plant and equipment	0	11.5	13.3
Purchase of businesses, net of cash acquired	0	0	-17.9
Proceeds from held-to maturity securities	224.3	377.6	122.2
Purchase of held-to-maturity securities	-195.7	-273.8	-370.8
Change in restricted cash	0	0	142.1
Contribution from subsidiaries	0	0	0
Net cash used in investing activities	-118.2	-133.4	-423.7
Cash flows from financing activities:	'	'	'
Intercompany loans	0	0	0
Intercompany loan repayments	0	0	0
Payments to parent	0	0	0
Proceeds from issuance of common stock under the employee stock purchase plan	8.3	8.3	8.1
Proceeds from exercise of stock options	12.1	9.4	59.4
Payments of tax withholding for restricted shares	-4.5	-9.6	-19.3
Repurchase of common stock	-101	-55.5	0
Proceeds from debt issuance	173.7	23.6	69
Payment of capital leases obligations	-41.7	-40.8	-39
Repayment of long-term debt	-217.7	-232.5	-159.5
Payments made in connection with repurchase or exchange of convertible notes	-3.2	-2.6	-15.9
Net cash used in financing activities	-174	-299.7	-97.2
Effect of exchange rate changes on cash and cash equivalents	-12.5	-8.9	5
Net increase (decrease) in cash and cash equivalents	22.6	-166	29.6
Cash and cash equivalents, beginning of period	486.9	652.9	623.3
Cash and cash equivalents, end of period	509.5	486.9	652.9
Issuer [Member]	'	'	'
Condensed Financial Statements, Captions [Line Items]	'	'	'
Net cash provided by operating activities	0	0	0
Cash flows from investing activities:	'	'	'
Purchases of property, plant and equipment	0	0	0
Proceeds from sales of property, plant and equipment	0	0	0
Deposits made for purchases of property, plant and equipment	0	0	0
Recovery from insurance on property, plant and equipment	'	0	0
Purchase of businesses, net of cash acquired	'	'	0
Proceeds from held-to maturity securities	0	0	0
Purchase of held-to-maturity securities	0	0	0
Change in restricted cash	'	'	0
Contribution from subsidiaries	235.2	167.8	23.9
Net cash used in investing activities	235.2	167.8	23.9
Cash flows from financing activities:	'	'	'
Intercompany loans	0	0	0
Intercompany loan repayments	0	0	0
Payments to parent	0	0	0
Proceeds from issuance of common stock under the employee stock purchase plan	8.3	8.3	8.1
Proceeds from exercise of stock options	12.1	9.4	59.4
Payments of tax withholding for restricted shares	-4.5	-9.6	-19.3
Repurchase of common stock	-101	-55.5	'
Proceeds from debt issuance	0	0	0
Payment of capital leases obligations	0	0	0
Repayment of long-term debt	-150.1	-117.8	-56.2
Payments made in connection with repurchase or exchange of convertible notes	0	-2.6	-15.9
Net cash used in financing activities	-235.2	-167.8	-23.9
Effect of exchange rate changes on cash and cash equivalents	0	0	0
Net increase (decrease) in cash and cash equivalents	0	0	0
Cash and cash equivalents, beginning of period	0	0	0
Cash and cash equivalents, end of period	0	0	0
SCI LLC [Member]	'	'	'
Condensed Financial Statements, Captions [Line Items]	'	'	'
Net cash provided by operating activities	63.9	45.5	0.4
Cash flows from investing activities:	'	'	'
Purchases of property, plant and equipment	-32.4	-55	-69
Proceeds from sales of property, plant and equipment	0.1	0.1	0.1
Deposits made for purchases of property, plant and equipment	0	0	0
Recovery from insurance on property, plant and equipment	'	0	0
Purchase of businesses, net of cash acquired	'	'	24.3
Proceeds from held-to maturity securities	224.3	377.6	122.2
Purchase of held-to-maturity securities	-195.7	-273.8	-370.8
Change in restricted cash	'	'	142.1
Contribution from subsidiaries	0	-7.9	234.5
Net cash used in investing activities	-3.7	41	83.4
Cash flows from financing activities:	'	'	'
Intercompany loans	-812	-524	-289.3
Intercompany loan repayments	981.7	562	182.2
Payments to parent	-246.5	-180.9	-37.7
Proceeds from issuance of common stock under the employee stock purchase plan	0	0	0
Proceeds from exercise of stock options	0	0	0
Payments of tax withholding for restricted shares	0	0	0
Repurchase of common stock	0	0	'
Proceeds from debt issuance	120	6.5	12.2
Payment of capital leases obligations	-38.2	-37.4	-36.4
Repayment of long-term debt	-6.2	-5.1	-2.6
Payments made in connection with repurchase or exchange of convertible notes	-3.2	0	0
Net cash used in financing activities	-4.4	-178.9	-171.6
Effect of exchange rate changes on cash and cash equivalents	0	0	0
Net increase (decrease) in cash and cash equivalents	55.8	-92.4	-87.8
Cash and cash equivalents, beginning of period	212.1	304.5	392.3
Cash and cash equivalents, end of period	267.9	212.1	304.5
Other Subsidiaries [Member]	'	'	'
Condensed Financial Statements, Captions [Line Items]	'	'	'
Net cash provided by operating activities	0.2	0.9	0
Cash flows from investing activities:	'	'	'
Purchases of property, plant and equipment	-0.2	-0.7	-0.2
Proceeds from sales of property, plant and equipment	0	0	0
Deposits made for purchases of property, plant and equipment	0	0	0
Recovery from insurance on property, plant and equipment	'	0	0
Purchase of businesses, net of cash acquired	'	'	0
Proceeds from held-to maturity securities	0	0	0
Purchase of held-to-maturity securities	0	0	0
Change in restricted cash	'	'	0
Contribution from subsidiaries	0	0	0
Net cash used in investing activities	-0.2	-0.7	-0.2
Cash flows from financing activities:	'	'	'
Intercompany loans	0	0	0
Intercompany loan repayments	0	0	0
Payments to parent	0	0	0
Proceeds from issuance of common stock under the employee stock purchase plan	0	0	0
Proceeds from exercise of stock options	0	0	0
Payments of tax withholding for restricted shares	0	0	0
Repurchase of common stock	0	0	'
Proceeds from debt issuance	0	0	0
Payment of capital leases obligations	0	0	0
Repayment of long-term debt	0	0	0
Payments made in connection with repurchase or exchange of convertible notes	0	0	0
Net cash used in financing activities	0	0	0
Effect of exchange rate changes on cash and cash equivalents	0	0	0
Net increase (decrease) in cash and cash equivalents	0	0.2	-0.2
Cash and cash equivalents, beginning of period	0	-0.2	0
Cash and cash equivalents, end of period	0	0	-0.2
Non-Guarantor Subsidiaries [Member]	'	'	'
Condensed Financial Statements, Captions [Line Items]	'	'	'
Net cash provided by operating activities	274.5	242.7	558.9
Cash flows from investing activities:	'	'	'
Purchases of property, plant and equipment	-122.6	-200.6	-247.2
Proceeds from sales of property, plant and equipment	9.6	6.1	3.2
Deposits made for purchases of property, plant and equipment	-1.3	1.4	0.5
Recovery from insurance on property, plant and equipment	'	11.5	13.3
Purchase of businesses, net of cash acquired	'	'	-42.2
Proceeds from held-to maturity securities	0	0	0
Purchase of held-to-maturity securities	0	0	0
Change in restricted cash	'	'	0
Contribution from subsidiaries	0	0	0
Net cash used in investing activities	-114.3	-181.6	-272.4
Cash flows from financing activities:	'	'	'
Intercompany loans	812	524	289.3
Intercompany loan repayments	-981.7	-562	-182.2
Payments to parent	0	7.9	-234.5
Proceeds from issuance of common stock under the employee stock purchase plan	0	0	0
Proceeds from exercise of stock options	0	0	0
Payments of tax withholding for restricted shares	0	0	0
Repurchase of common stock	0	0	'
Proceeds from debt issuance	53.7	17.1	56.8
Payment of capital leases obligations	-3.5	-3.4	-2.6
Repayment of long-term debt	-61.4	-109.6	-100.7
Payments made in connection with repurchase or exchange of convertible notes	0	0	0
Net cash used in financing activities	-180.9	-126	-173.9
Effect of exchange rate changes on cash and cash equivalents	-12.5	-8.9	5
Net increase (decrease) in cash and cash equivalents	-33.2	-73.8	117.6
Cash and cash equivalents, beginning of period	274.8	348.6	231
Cash and cash equivalents, end of period	241.6	274.8	348.6
Eliminations [Member]	'	'	'
Condensed Financial Statements, Captions [Line Items]	'	'	'
Net cash provided by operating activities	-11.3	-13.1	-13.8
Cash flows from investing activities:	'	'	'
Purchases of property, plant and equipment	0	0	0
Proceeds from sales of property, plant and equipment	0	0	0
Deposits made for purchases of property, plant and equipment	0	0	0
Recovery from insurance on property, plant and equipment	'	0	0
Purchase of businesses, net of cash acquired	'	'	0
Proceeds from held-to maturity securities	0	0	0
Purchase of held-to-maturity securities	0	0	0
Change in restricted cash	'	'	0
Contribution from subsidiaries	-235.2	-159.9	-258.4
Net cash used in investing activities	-235.2	-159.9	-258.4
Cash flows from financing activities:	'	'	'
Intercompany loans	0	0	0
Intercompany loan repayments	0	0	0
Payments to parent	246.5	173	272.2
Proceeds from issuance of common stock under the employee stock purchase plan	0	0	0
Proceeds from exercise of stock options	0	0	0
Payments of tax withholding for restricted shares	0	0	0
Repurchase of common stock	0	0	'
Proceeds from debt issuance	0	0	0
Payment of capital leases obligations	0	0	0
Repayment of long-term debt	0	0	0
Payments made in connection with repurchase or exchange of convertible notes	0	0	0
Net cash used in financing activities	246.5	173	272.2
Effect of exchange rate changes on cash and cash equivalents	0	0	0
Net increase (decrease) in cash and cash equivalents	0	0	0
Cash and cash equivalents, beginning of period	0	0	0
Cash and cash equivalents, end of period	$0	$0	$0

Recovered_Sheet2

Valuation and Qualifying Accounts and Reserves (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Allowance for Doubtful Accounts [Member]	'		'		'
Movement in Valuation Allowances and Reserves [Roll Forward]	'		'		'
Balance at Beginning of Period	$2.70		$7.10		$7.30
Charged to Costs and Expenses	0		-1.9		-0.2
Charged to Other Accounts	0		0		0
Deductions/Write-offs	-1.7		-2.5		0
Balance at End of Period	1		2.7		7.1
Valuation Allowance of Deferred Tax Assets [Member]	'		'		'
Movement in Valuation Allowances and Reserves [Roll Forward]	'		'		'
Balance at Beginning of Period	1,420.10		1,626.10		560.8
Charged to Costs and Expenses	74.9		-4		170.1
Charged to Other Accounts	-161.8	[1]	-92.2	[1]	895.2	[2]
Deductions/Write-offs	-6		-109.8	[3]	0
Balance at End of Period	1,327.20		1,420.10		1,626.10
Acquisition of SANYO Semiconductor Co., LTD	'		'		'
Movement in Valuation Allowances and Reserves [Roll Forward]	'		'		'
Charge to goodwill for deferred taxes acquired	'		$895.20		'
[1]	Represents the effects of cumulative translation adjustments.
[2]	Represents a charge of $895.2 million to goodwill for deferred tax assets acquired from SANYO Semiconductor on January 1, 2011.
[3]	Represents decreases to deferred tax assets, which have a full valuation allowance arising from the SANYO Semiconductor Transaction. Additional information related to these deferred tax assets became available in 2012.