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Income Taxes - Components of Consolidated Income Tax Provision (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Current income tax provision -      
U.S. federal $ 109.4 $ 123.2 $ 150.7
State and local 27.5 37.0 42.9
Foreign 0.1 0.1 0.2
Total current provision for taxes 137.0 160.3 193.8
Deferred income tax provision (benefit) -      
U.S. federal 26.8 55.3 34.7
State and local 8.0 5.0 4.0
Foreign (0.1)    
Total deferred provision (benefit) for taxes 34.7 60.3 38.7
Total provision for taxes $ 171.7 $ 220.6 $ 232.5