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Income Taxes - Components of Income from Continuing Operations Before Income Taxes (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Income Tax Disclosure [Abstract]    
US $ (58.3) $ 179.6
Foreign 1.6 2.7
(Loss) income from continuing operations $ (56.7) $ 182.3