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Income Taxes - Summary of Income Tax Expense in Consolidated Statements of Operations from Continuing Operations (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Current:      
Federal $ 12.1 $ 15.0 $ (3.7)
Foreign 24.8 23.2 17.8
State 1.6 0.2 0.1
Current income tax expense 38.5 38.4 14.2
Deferred:      
Federal (11.0) (8.9) 2.4
Foreign 1.8 (6.4) (6.8)
State 1.5 1.3 (1.1)
Deferred income tax expense (7.7) (14.0) (5.5)
Total $ 30.8 $ 24.4 $ 8.7