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Acquisitions - Pro Forma Information (Details) - Quantenna - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items] |  |
Revenue | $ 5,613.2 | $ 6,098.8
Net income | 218.2 | 567.2
Net income attributable to ON Semiconductor Corporation | $ 216.0 | $ 564.7
Basic (in dollars per share) | $ 0.53 | $ 1.33
Diluted (in dollars per share) | $ 0.52 | $ 1.30

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