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Earnings Per Share and Equity (Schedule of Net Income Per Share) (Details) - USD ($) $ / shares in Units, shares in Millions, $ 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
Equity [Abstract]
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
Basic weighted average common shares outstanding									415.2	421.2	439.5
Add: Incremental shares for:
Dilutive effect of share-based awards (in shares)									3.8	4.6	4.0
Dilutive effect of convertible notes (in shares)									1.0	2.0	0.0
Diluted weighted average common shares outstanding									420.0	427.8	443.5
Net income per common share attributable to ON Semiconductor Corporation:
Basic (in dollars per share)									$ 0.44	$ 0.49	$ 0.43
Diluted (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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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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