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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, 2019	Sep. 27, 2019	Jun. 28, 2019	Mar. 29, 2019	Dec. 31, 2018	Sep. 28, 2018	Jun. 29, 2018	Mar. 30, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Equity [Abstract]
Net income (loss) attributable to ON Semiconductor Corporation	$ 56.5	$ (60.7)	$ 101.8	$ 114.1	$ 165.6	$ 166.9	$ 155.3	$ 139.6	$ 211.7	$ 627.4	$ 810.7
Basic weighted average common shares outstanding (in shares)									410.9	423.8	421.9
Add: Incremental shares for:
Dilutive effect of share-based awards (in shares)									1.9	4.3	5.5
Dilutive effect of convertible notes (in shares)									3.2	7.8	0.9
Diluted weighted average common shares outstanding (in shares)									416.0	435.9	428.3
Net income per common share attributable to ON Semiconductor Corporation:
Basic (in dollars per share)									$ 0.52	$ 1.48	$ 1.92
Diluted (in dollars per share)	$ 0.14	$ (0.15)	$ 0.24	$ 0.27	$ 0.39	$ 0.38	$ 0.35	$ 0.31	$ 0.51	$ 1.44	$ 1.89

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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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