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Income Taxes - Sources of Income before Income Taxes (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Income Tax Disclosure [Abstract]      
Domestic $ 52.4 $ 37.1 $ 3.1
Foreign 98.0 94.5 125.0
Income before income tax expense $ 150.4 $ 131.6 $ 128.1