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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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Business Acquisitions, Pro Forma Net Income (Loss) Attributable To Parent

+ References

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Per basic share amount of pro forma income from continuing operations, after tax, as if the business combination had been completed at the beginning of a period.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
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Per diluted share amount of pro forma income from continuing operations, after tax, as if the business combination had been completed at the beginning of a period.

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