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Income Taxes - Components of Income Tax Expense (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Current:      
Federal $ 12.4 $ 27.0 $ 12.4
State and local 0.2 6.5 2.6
Foreign 18.6 23.1 19.4
Total Current Income Tax 31.2 56.6 34.4
Deferred:      
Federal 5.2 (3.7) (1.9)
State and local 0.3 (0.7) (0.3)
Foreign (1.4) (0.6) 9.1
Total Deferred Income Tax 4.1 (5.0) 6.9
Total $ 35.3 $ 51.6 $ 41.3