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Income Taxes - Components of Earnings (Loss) From Continuing Operations Before Income Taxes (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Components Of Income Tax Expense Benefit Continuing Operations [Abstract]      
U.S. $ (56.4) $ (12.1) $ (617.9)
Foreign 84.7 87.6 120.7
Earnings (loss) before income taxes $ 28.3 $ 75.5 $ (497.2)