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Income Taxes - Schedule Of Income Before Provision For Income Taxes (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Tax Disclosure [Abstract]      
Income before provision for income taxes, U.S. $ 765.0 $ 653.0 $ 425.1
Income before provision for income taxes, Foreign 331.5 327.8 333.4
Income before taxes $ 1,096.5 $ 980.8 $ 758.5