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Income Taxes - Sources of Income before Income Taxes (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Income Tax Disclosure [Abstract]      
Domestic $ 95.2 $ 106.3 $ 53.2
Foreign 79.2 78.3 81.2
Income before income tax expense $ 174.4 $ 184.6 $ 134.4