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Income Taxes - Summary of Current and Deferred Income Tax Provision (Benefit) (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Current      
Federal $ 3.3 $ 2.4 $ 20.8
State and local 0.1 1.6 6.1
Foreign 0.1    
Total current provision for income taxes 3.5 4.0 26.9
Deferred      
Federal 0.8 1.8 0.2
State and local 0.9 (0.5) 0.2
Foreign 0.1   (0.1)
Total deferred provision for income taxes 1.8 1.3 0.3
Total provision for income taxes $ 5.3 $ 5.3 $ 27.2