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Income Taxes - Components of Provision (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Current:      
Federal $ 0.0 $ 0.0 $ 0.0
State 1.0 2.7 0.1
Foreign 1.9 0.1 1.5
Total current income taxes 2.9 2.8 1.6
Deferred:      
Federal 0.0 (1.7) 0.0
State 0.0 (0.5) 0.0
Foreign 0.2 0.0 0.0
Total deferred income taxes 0.2 (2.2) 0.0
Income taxes at effective rates $ 3.1 $ 0.6 $ 1.6