Income Taxes - Components of Income Tax Expense (Benefit) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Current
Federal	$ 273.3	$ 267.6	$ 214.3
State	59.6	58.0	46.7
Foreign	44.9	35.0	34.1
Income tax expense	377.8	360.6	295.1
Deferred
Federal	(9.2)	(5.0)	(11.4)
State	(1.3)	(1.1)	(1.7)
Foreign	(0.3)	(1.4)	0.8
Income tax expense	(10.8)	(7.5)	(12.3)
Total
Federal	264.1	262.6	202.9
State	58.3	56.9	45.0
Foreign	44.6	33.6	34.9
Effective income tax rate	$ 367.0	$ 353.1	$ 282.8