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Acquisitions - Pro Forma Information (Details) - Quantenna - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jul. 03, 2020 | Jun. 28, 2019 | Jul. 03, 2020 | Jun. 28, 2019
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items] |  |  |  |
Revenue | $ 1,213.5 | $ 1,385.3 | $ 2,491.4 | $ 2,829.6
Net income (loss) | (0.9) | 96.7 | (13.6) | 198.5
Net income (loss) attributable to ON Semiconductor Corporation | $ (1.4) | $ 95.6 | $ (14.4) | $ 197.4
Basic (in dollars per share) | $ 0.00 | $ 0.23 | $ (0.04) | $ 0.48
Diluted (in dollars per share) | $ 0.00 | $ 0.23 | $ (0.04) | $ 0.47

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