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Earnings Per Share and Equity (Schedule of Net Income Per Share) (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jul. 01, 2016
Apr. 01, 2016
Dec. 31, 2015
Oct. 02, 2015
Jul. 03, 2015
Apr. 03, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Equity [Abstract]                      
Net income attributable to ON Semiconductor Corporation $ 110.9 $ 10.1 $ 25.1 $ 36.0 $ 54.1 $ 46.3 $ 50.7 $ 55.1 $ 182.1 $ 206.2 $ 189.7
Basic weighted average common shares outstanding                 415.2 421.2 439.5
Add: Incremental shares for:                      
Dilutive effect of share-based awards (in shares)                 3.8 4.6 4.0
Dilutive effect of convertible notes (in shares)                 1.0 2.0 0.0
Diluted weighted average common shares outstanding                 420.0 427.8 443.5
Net income per common share attributable to ON Semiconductor Corporation:                      
Basic (in dollars per share)                 $ 0.44 $ 0.49 $ 0.43
Diluted (in dollars per share) $ 0.26 $ 0.02 $ 0.06 $ 0.09 $ 0.13 $ 0.11 $ 0.12 $ 0.13 $ 0.43 $ 0.48 $ 0.43