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Income Taxes - Components of Earnings (Loss) Before Taxes (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Tax Disclosure [Abstract]      
United States operations $ (382.8) $ (114.0) $ (251.8)
Foreign operations 111.7 578.6 651.4
Total $ (271.1) $ 464.6 $ 399.6