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Income Taxes - Income before Tax, Domestic and Foreign (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Tax Disclosure [Abstract]      
Document Fiscal Year Focus 2018    
Components of Earnings before Income Tax [Abstract]      
Domestic $ (34.1) $ 402.7 $ (51.1)
Foreign 95.2 (383.3) 79.2
(Loss) earnings before income taxes $ 61.1 $ 19.4 $ 28.1