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Income Taxes - Sources of Income before Income Taxes (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Income Tax Disclosure [Abstract]      
Domestic $ 16.8 $ 52.7 $ 15.2
Foreign 86.3 99.6 95.7
Income before income taxes $ 103.1 $ 152.3 $ 110.9