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Income Taxes - Summary of Provision for Income Taxes (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Current:      
Federal $ 2.0 $ 0.0 $ 15.8
Foreign 5.0 2.4 3.3
State and local (3.3) 0.1 4.2
Total current 3.7 2.5 23.3
Deferred:      
Federal (214.9) 3.5 20.4
Foreign (4.6) (2.3) 0.1
State and local (8.9) 11.1 1.8
Total deferred (228.4) 12.3 22.3
Total income tax (benefit) provision $ (224.7) $ 14.8 $ 45.6