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Supplementary Financial Information - Selected Quarterly Financial Data (Unaudited) - Schedule of Quarterly Financial Information (Details) - USD ($)
$ / shares in Units, $ 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
Quarterly Financial Information Disclosure [Abstract]                      
Revenue $ 1,446.3 $ 1,317.3 $ 1,213.5 $ 1,277.9 $ 1,401.8 $ 1,381.8 $ 1,347.7 $ 1,386.6      
Gross Profit (exclusive of the amortization of acquisition-related intangible assets) 497.6 441.2 374.3 402.7 485.7 475.2 499.0 513.7 $ 1,715.8 $ 1,973.6 $ 2,238.7
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
Diluted net income (loss) per common share attributable to ON Semiconductor Corporation (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
Litigation settlement           $ 169.5     $ 0.0 $ 169.5 $ 0.0