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Income Taxes - Income Tax Provision (Benefit) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Current:      
Federal $ 266.2 $ 108.9 $ 40.0
State 111.6 50.3 24.0
Foreign 1.2 0.0 0.0
Current income tax expense (benefit) 379.0 159.2 64.0
Deferred:      
Federal 38.2 17.6 34.7
State 3.8 1.4 5.2
Foreign 1.1 0.0 0.0
Deferred income tax expense (benefit) 43.1 19.0 39.9
Total $ 422.1 $ 178.2 $ 103.9