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Income Taxes - Components of Consolidated Income Tax Provision (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Current income tax provision (benefit) -      
U.S. federal $ 150.7 $ 209.3 $ 213.6
State and local 42.9 34.9 29.1
Foreign 0.2 0.3 0.2
Total current provision for taxes 193.8 244.5 242.9
Deferred -      
U.S. federal 34.7 (90.2) (1.2)
State and local 4.0 5.7 (3.0)
Foreign     0.2
Total deferred provision (benefit) for taxes 38.7 (84.5) (4.0)
Total provision for taxes $ 232.5 $ 160.0 $ 238.9