CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jul. 01, 2022	Jul. 02, 2021	Jul. 01, 2022	Jul. 02, 2021
Income Statement [Abstract]
Revenue	$ 2,085.0	$ 1,669.9	$ 4,030.0	$ 3,151.6
Cost of revenue (exclusive of amortization shown below)	1,047.9	1,029.8	2,031.6	1,990.3
Gross profit	1,037.1	640.1	1,998.4	1,161.3
Operating expenses:
Research and development	161.6	166.3	318.4	339.9
Selling and marketing	73.1	76.1	144.2	155.0
General and administrative	83.2	73.2	161.1	145.6
Amortization of acquisition-related intangible assets	21.9	24.8	43.2	49.8
Restructuring, asset impairments and other, net	(1.7)	17.5	(14.7)	60.0
Goodwill and intangible asset impairment	115.0	0.0	115.0	2.9
Total operating expenses	453.1	357.9	767.2	753.2
Operating income	584.0	282.2	1,231.2	408.1
Other income (expense), net:
Interest expense	(22.1)	(33.1)	(43.7)	(66.5)
Interest income	1.1	0.2	1.5	0.6
Loss on debt refinancing and prepayment	(7.3)	(26.2)	(7.3)	(26.2)
Gain on divestiture of business	1.9	0.0	1.9	0.0
Other income (expense)	6.4	(1.1)	8.5	3.4
Other income (expense), net	(20.0)	(60.2)	(39.1)	(88.7)
Income before income taxes	564.0	222.0	1,192.1	319.4
Income tax provision	(107.4)	(37.9)	(204.5)	(45.0)
Net income	456.6	184.1	987.6	274.4
Less: Net income attributable to non-controlling interest	(0.8)	0.0	(1.6)	(0.4)
Net income attributable to ON Semiconductor Corporation	455.8	184.1	986.0	274.0
Net income for diluted earnings per share of common stock	$ 456.3	$ 184.1	$ 987.0	$ 274.0
Net income per share of common stock:
Basic (in dollars per share)	$ 1.05	$ 0.43	$ 2.27	$ 0.65
Diluted (in dollars per share)	$ 1.02	$ 0.42	$ 2.20	$ 0.62
Weighted-average shares of common stock outstanding:
Basic (in shares)	434.2	427.7	433.8	420.5
Diluted (in shares)	447.0	443.6	448.1	444.5
Comprehensive income, net of tax:
Net income	$ 456.6	$ 184.1	$ 987.6	$ 274.4
Foreign currency translation adjustments	(4.2)	(0.2)	(6.6)	(2.5)
Effects of cash flow hedges and other adjustments	1.3	3.9	17.9	7.9
Other comprehensive income (loss), net of tax	(2.9)	3.7	11.3	5.4
Comprehensive income	453.7	187.8	998.9	279.8
Comprehensive income attributable to non-controlling interest	(0.8)	0.0	(1.6)	(0.4)
Comprehensive income attributable to ON Semiconductor Corporation	$ 452.9	$ 187.8	$ 997.3	$ 279.4