Annual report pursuant to Section 13 and 15(d)

Income Taxes - Components of Income before Income Taxes (Detail)

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Income Taxes - Components of Income before Income Taxes (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income Tax Disclosure [Abstract]      
Domestic $ 80.9 $ 94.0 $ 155.6
Foreign 405.5 327.3 561.1
Income before income taxes $ 486.4 $ 421.3 $ 716.7