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Acquisitions and Divestitures (Schedule of Pro Forma Information) (Details) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Fairchild [Member]      
Business Acquisition [Line Items]      
Non-recurring acquisition advisory fees $ 16.9    
Revenues 4,912.8 $ 4,866.0  
Net income attributable to ON Semiconductor Corporation 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  
Aptina, Inc. and Truesense Imaging, Inc. [Member]      
Business Acquisition [Line Items]      
Revenues     $ 3,536.4
Gross profit     1,213.7
Net income attributable to ON Semiconductor Corporation     $ 147.8
Net income per common share attributable to ON Semiconductor Corporation, Basic (in dollars per share)     $ 0.34
Net income per common share attributable to ON Semiconductor Corporation, Diluted (in dollars per share)     $ 0.33