CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Statement [Abstract]
Revenue	$ 6,739.8	$ 5,255.0	$ 5,517.9
Cost of revenue (exclusive of amortization shown below)	4,025.5	3,539.2	3,544.3
Gross profit	2,714.3	1,715.8	1,973.6
Operating expenses:
Research and development	655.0	642.9	640.9
Selling and marketing	293.6	278.7	301.0
General and administrative	304.8	258.7	284.0
Litigation settlement	0.0	0.0	169.5
Amortization of acquisition-related intangible assets	99.0	120.3	115.2
Restructuring, asset impairments and other charges, net	71.4	65.2	28.7
Intangible asset impairment	2.9	1.3	1.6
Total operating expenses	1,426.7	1,367.1	1,540.9
Operating income	1,287.6	348.7	432.7
Other income (expense), net:
Interest expense	(130.4)	(168.4)	(148.3)
Interest income	1.4	4.9	10.2
Loss on debt refinancing and prepayment	(29.0)	0.0	(6.2)
Gain on divestiture of business	10.2	0.0	0.0
Other income (expense)	18.0	(8.6)	(11.8)
Other income (expense), net	(129.8)	(172.1)	(156.1)
Income before income taxes	1,157.8	176.6	276.6
Income tax (provision) benefit	(146.6)	59.8	(62.7)
Net income	1,011.2	236.4	213.9
Less: Net income attributable to non-controlling interest	(1.6)	(2.2)	(2.2)
Net income attributable to ON Semiconductor Corporation	1,009.6	234.2	211.7
Comprehensive income (loss), net of tax:
Net income	1,011.2	236.4	213.9
Foreign currency translation adjustments	(3.8)	1.8	0.1
Effects of cash flow hedges	20.8	(5.1)	(16.5)
Other comprehensive income (loss), net of tax	17.0	(3.3)	(16.4)
Comprehensive income	1,028.2	233.1	197.5
Comprehensive income attributable to non-controlling interest	(1.6)	(2.2)	(2.2)
Comprehensive income attributable to ON Semiconductor Corporation	$ 1,026.6	$ 230.9	$ 195.3
Net income per share of common stock attributable to ON Semiconductor Corporation:
Basic (in dollars per share)	$ 2.37	$ 0.57	$ 0.52
Diluted (in dollars per share)	$ 2.27	$ 0.56	$ 0.51
Weighted-average shares of common stock outstanding:
Basic (in shares)	425.7	410.7	410.9
Diluted (in shares)	443.8	418.8	416.0