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Income Taxes - Sources 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 $ 52.7 $ 15.2 $ 10.0
Foreign 99.6 95.7 82.8
Income before income taxes $ 152.3 $ 110.9 $ 92.8