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Income Taxes - Components of Consolidated Income Tax Provision (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Current income tax provision -      
U.S. federal $ 158.0 $ 109.4 $ 123.2
State and local 50.1 27.5 37.0
Foreign 0.1 0.1 0.1
Total current provision for taxes 208.2 137.0 160.3
Deferred income tax provision (benefit) -      
U.S. federal 62.1 26.8 55.3
State and local (2.6) 8.0 5.0
Foreign (0.1) (0.1)  
Total deferred provision (benefit) for taxes 59.4 34.7 60.3
Total provision for taxes $ 267.6 $ 171.7 $ 220.6