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Income Taxes - Components of Provision (Benefit) for Income Taxes (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Current:      
Federal $ 12.0 $ 7.0 $ 6.6
Foreign 0.8 0.6 0.0
State and local 2.9 2.0 1.8
Total current tax expense 15.7 9.6 8.4
Deferred:      
Federal (15.7) 8.4 25.4
Foreign 0.8 (0.7) (2.0)
State and local (0.3) 0.1 2.3
Total deferred tax (benefit) expense (15.2) 7.8 25.7
Total income tax expense $ 0.5 $ 17.4 $ 34.1