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Acquisitions - Pro Forma Information (Details) - Quantenna - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Revenue	$ 5,613.2	$ 6,098.8
Net income	218.2	567.2
Net income attributable to ON Semiconductor Corporation	$ 216.0	$ 564.7
Basic (in dollars per share)	$ 0.53	$ 1.33
Diluted (in dollars per share)	$ 0.52	$ 1.30

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Business Acquisitions, Pro Forma Net Income (Loss) Attributable To Parent

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Per basic share amount of pro forma income from continuing operations, after tax, as if the business combination had been completed at the beginning of a period.

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