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Income Taxes - Components of Provision (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Current:        
Federal $ 0.0 $ 0.0   $ 0.0
State 0.1 2.7   0.1
Foreign 1.5 0.1   0.8
Total current income taxes 1.6 2.8   0.9
Deferred:        
Federal 0.0 (1.7)   (0.1)
State 0.0 (0.5)   0.0
Foreign 0.0 0.0   (0.1)
Total deferred income taxes 0.0 (2.2)   (0.2)
Income taxes at effective rates $ 1.6 $ 0.6 $ 1.6 $ 0.7