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Income Taxes - Jurisdictions, Net Income (Loss) Subject to Income Taxes (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2016
Income Tax Disclosure [Abstract]      
United States $ 12.4 $ (28.3) $ (44.4)
Outside of the United States (61.0) (98.2) (20.5)
Total $ (48.6) $ (126.5) $ (64.9)