Acquisitions, Divestitures and Licensing Transactions (Schedule of Pro Forma Information) (Details) - Fairchild - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Business Acquisition [Line Items]
Revenues	$ 4,912.8	$ 4,866.0
Net Income	196.6	58.2
Net income attributable to ON Semiconductor Corporation	$ 194.2	$ 55.4
Net income per common share attributable to ON Semiconductor Corporation, Basic (in dollars per share)	$ 0.47	$ 0.13
Net income per common share attributable to ON Semiconductor Corporation, Diluted (in dollars per share)	$ 0.46	$ 0.13