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Income Taxes - Components of Income Tax Expense (Benefit) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Current:      
Federal $ (0.1) $ 0.1 $ (1.5)
State (0.2) (0.3) (0.6)
Foreign (4.6) (2.3) (2.9)
Deferred:      
Federal 0.0 1.4 0.0
State 0.0 0.0 0.0
Foreign 0.1 0.9 (0.2)
Provision for income taxes $ (4.8) $ (0.2) $ (5.2)