CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Apr. 01, 2022	Apr. 02, 2021
Income Statement [Abstract]
Revenue	$ 1,945.0	$ 1,481.7
Cost of revenue (exclusive of amortization shown below)	983.7	960.5
Gross profit	961.3	521.2
Operating expenses:
Research and development	156.8	173.6
Selling and marketing	71.1	78.9
General and administrative	77.9	72.4
Amortization of acquisition-related intangible assets	21.3	25.0
Restructuring, asset impairments and other charges, net	(13.0)	42.5
Intangible asset impairment	0.0	2.9
Total operating expenses	314.1	395.3
Operating income	647.2	125.9
Other income (expense), net:
Interest expense	(21.6)	(33.4)
Interest income	0.4	0.4
Other income (expense)	2.1	4.5
Other income (expense), net	(19.1)	(28.5)
Income before income taxes	628.1	97.4
Income tax provision	(97.1)	(7.1)
Net income	531.0	90.3
Less: Net income attributable to non-controlling interest	(0.8)	(0.4)
Net income attributable to ON Semiconductor Corporation	530.2	89.9
Net income for diluted earnings per share of common stock	$ 530.7	$ 89.9
Net income per share of common stock:
Basic (in dollars per share)	$ 1.22	$ 0.22
Diluted (in dollars per share)	$ 1.18	$ 0.20
Weighted-average shares of common stock outstanding:
Basic (in shares)	433.3	413.4
Diluted (in shares)	448.9	445.4
Comprehensive income, net of tax:
Net income	$ 531.0	$ 90.3
Foreign currency translation adjustments	(2.4)	(2.3)
Effects of cash flow hedges and other adjustments	16.6	4.0
Other comprehensive income, net of tax	14.2	1.7
Comprehensive income	545.2	92.0
Comprehensive income attributable to non-controlling interest	(0.8)	(0.4)
Comprehensive income attributable to ON Semiconductor Corporation	$ 544.4	$ 91.6