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Income Taxes - Sources 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 $ 3.1 $ 16.8 $ 52.7
Foreign 125.0 86.3 99.6
Income before income taxes $ 128.1 $ 103.1 $ 152.3