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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, 2020
Oct. 02, 2020
Jul. 03, 2020
Apr. 03, 2020
Dec. 31, 2019
Sep. 27, 2019
Jun. 28, 2019
Mar. 29, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Equity [Abstract]                      
Net income (loss) attributable to ON Semiconductor Corporation $ 89.0 $ 160.6 $ (1.4) $ (14.0) $ 56.5 $ (60.7) $ 101.8 $ 114.1 $ 234.2 $ 211.7 $ 627.4
Basic weighted average shares of common stock outstanding (in shares)                 410.7 410.9 423.8
Add: Incremental shares for:                      
Dilutive effect of share-based awards (in shares)                 1.9 1.9 4.3
Dilutive effect of convertible notes and warrants (in shares)                 6.2 3.2 7.8
Diluted weighted average shares of common stock outstanding (in shares)                 418.8 416.0 435.9
Net income per share of common stock attributable to ON Semiconductor Corporation:                      
Basic (in dollars per share)                 $ 0.57 $ 0.52 $ 1.48
Diluted (in dollars per share) $ 0.21 $ 0.38 $ (0.00) $ (0.03) $ 0.14 $ (0.15) $ 0.24 $ 0.27 $ 0.56 $ 0.51 $ 1.44