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Supplementary Financial Information - Selected Quarterly Financial Data (Unaudited) (Schedule of Quarterly Financial Information) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jul. 01, 2016	Apr. 01, 2016	Dec. 31, 2015	Oct. 02, 2015	Jul. 03, 2015	Apr. 03, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract]
Revenues	$ 1,261.0	$ 950.9	$ 877.8	$ 817.2	$ 840.3	$ 904.2	$ 880.5	$ 870.8	$ 3,906.9	$ 3,495.8	$ 3,161.8
Gross Profit (exclusive of the amortization of acquisition related intangible assets)	384.5	329.0	307.9	275.5	279.9	308.5	304.4	300.4	1,296.9	1,193.2	1,084.9
Net income attributable to ON Semiconductor Corporation	$ 110.9	$ 10.1	$ 25.1	$ 36.0	$ 54.1	$ 46.3	$ 50.7	$ 55.1	$ 182.1	$ 206.2	$ 189.7
Diluted net income per common share attributable to ON Semiconductor Corporation (in dollars per share)	$ 0.26	$ 0.02	$ 0.06	$ 0.09	$ 0.13	$ 0.11	$ 0.12	$ 0.13	$ 0.43	$ 0.48	$ 0.43

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- Definition

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

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Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity.

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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