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Income Taxes - Components of Consolidated Income Tax Provision (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Current income tax provision (benefit) -      
U.S. Federal $ 213.6 $ 205.1 $ 185.1
State and local 29.1 20.5 33.1
Foreign 0.2 0.4 0.9
Total current provision for taxes 242.9 226.0 219.1
Deferred -      
U.S. Federal (1.2) (3.8) (5.0)
State and local (3.0) 5.6 7.6
Foreign 0.2 (0.1) 0.0
Total deferred provision (benefit) for taxes (4.0) 1.7 2.6
Total provision (benefit) for taxes $ 238.9 $ 227.7 $ 221.7