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Earnings Per Share and Equity - Income per Share Calculations (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 28, 2018	Sep. 29, 2017	Sep. 28, 2018	Sep. 29, 2017
Earnings Per Share [Abstract]
Net income attributable to ON Semiconductor Corporation	$ 166.9	$ 108.7	$ 461.8	$ 280.8
Basic weighted average common shares outstanding (in shares)	425.5	422.2	426.1	421.0
Dilutive effect of share-based awards (in shares)	3.9	5.3	4.7	5.5
Dilutive effect of convertible notes (in shares)	5.9	0.0	10.4	0.0
Diluted weighted average common shares outstanding (in shares)	435.3	427.5	441.2	426.5
Net income per common share attributable to ON Semiconductor Corporation:
Basic (in dollars per share)	$ 0.39	$ 0.26	$ 1.08	$ 0.67
Diluted (in dollars per share)	$ 0.38	$ 0.25	$ 1.05	$ 0.66

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