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Income Taxes - Provision for Income Taxes (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income before income taxes      
United States $ (76.2) $ (140.5) $ (167.2)
Foreign 4.0 1.3 (1.3)
Loss Before Income Taxes (72.2) (139.2) (168.5)
Current:      
United States (27.4) (30.6) (49.5)
State (4.6) (3.5) (4.2)
Foreign 1.4 0.7 (0.2)
Total (30.6) (33.4) (53.9)
Deferred:      
United States (9.0) (21.3) (12.5)
State (0.4) (1.0) (0.8)
Foreign (0.1) (0.2) (0.1)
Total (9.5) (22.5) (13.4)
Total income tax benefit $ (40.1) $ (55.9) $ (67.3)