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Income Taxes - Components of Provision (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Current:      
Federal $ 0.0 $ 0.0 $ 0.0
State 6.1 1.0 2.7
Foreign 2.6 1.9 0.1
Total current income taxes 8.7 2.9 2.8
Deferred:      
Federal (198.8) 0.0 (1.7)
State (51.4) 0.0 (0.5)
Foreign (27.1) 0.2 0.0
Total deferred income taxes (277.3) 0.2 (2.2)
Income taxes at effective rates $ (268.6) $ 3.1 $ 0.6