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Income Taxes - Components of Income before Income Taxes (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Tax Disclosure [Abstract]      
Domestic $ (29.0) $ (89.3) $ 80.9
Foreign 500.2 454.0 405.5
Income before income taxes $ 471.2 $ 364.7 $ 486.4