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Income Taxes - Income (Loss) Before Taxes (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Tax Disclosure [Abstract]      
United States $ 32.0 $ 5.5 $ 30.1
Foreign 37.0 5.6 (6.0)
Income from continuing operations before income taxes $ 69.0 $ 11.1 $ 24.1