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