CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Income Statement [Abstract]
Revenue	$ 7,082.3	$ 8,253.0	$ 8,326.2
Cost of revenue	3,866.2	4,369.5	4,249.0
Gross profit	3,216.1	3,883.5	4,077.2
Operating expenses:
Research and development	612.7	577.3	600.2
Selling and marketing	273.5	279.1	287.9
General and administrative	376.3	362.4	343.2
Amortization of acquisition-related intangible assets	52.0	51.1	81.2
Restructuring, asset impairments and other charges, net	133.9	74.9	17.9
Goodwill and intangible asset impairment	0.0	0.0	386.8
Total operating expenses	1,448.4	1,344.8	1,717.2
Operating income	1,767.7	2,538.7	2,360.0
Other income (expense), net:
Interest expense	(62.3)	(74.8)	(94.9)
Interest income	111.4	93.1	15.5
Loss on debt refinancing and prepayment	0.0	(13.3)	(7.1)
Gain (loss) on divestiture of businesses	0.0	(0.7)	67.0
Other income (expense), net	20.6	(7.2)	21.7
Other income (expense), net	69.7	(2.9)	2.2
Income before income taxes	1,837.4	2,535.8	2,362.2
Income tax provision	(262.8)	(350.2)	(458.4)
Net income	1,574.6	2,185.6	1,903.8
Less: Net income attributable to non-controlling interest	(1.8)	(1.9)	(1.6)
Net income attributable to ON Semiconductor Corporation	1,572.8	2,183.7	1,902.2
Net income for diluted earnings per share of common stock (Note 10)	$ 1,572.8	$ 2,185.0	$ 1,904.2
Net income per share of common stock attributable to ON Semiconductor Corporation:
Basic (in dollars per share)	$ 3.68	$ 5.07	$ 4.39
Diluted (in dollars per share)	$ 3.63	$ 4.89	$ 4.25
Weighted-average shares of common stock outstanding:
Basic (in shares)	427.4	430.7	433.2
Diluted (in shares)	432.7	446.8	448.2
Comprehensive income (loss), net of tax:
Net income	$ 1,574.6	$ 2,185.6	$ 1,903.8
Foreign currency translation adjustments	(3.4)	(2.1)	(6.0)
Effects of cash flow hedges	(13.8)	(19.9)	23.4
Other comprehensive income (loss), net of tax	(17.2)	(22.0)	17.4
Comprehensive income	1,557.4	2,163.6	1,921.2
Comprehensive income attributable to non-controlling interest	(1.8)	(1.9)	(1.6)
Comprehensive income attributable to ON Semiconductor Corporation	$ 1,555.6	$ 2,161.7	$ 1,919.6