Income Taxes - Income Tax Expense by Component (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Current:
Federal	$ 235.6	$ 166.5	$ 224.7
State	52.9	49.2	56.1
Foreign	27.4	18.3	20.0
Total current	315.9	234.0	300.8
Deferred:
Domestic	(8.7)	(18.8)	(83.0)
Foreign	2.0	(1.4)	(4.9)
Total deferred	(6.7)	(20.2)	(87.9)
Income tax expense	$ 309.2	$ 213.8	$ 212.9

Amount of current federal tax expense (benefit) pertaining to income (loss) from continuing operations.

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