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Income Taxes - Provisions for Federal and State Income Taxes (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Current Income Tax Provision      
Federal $ 0.4 $ 4.3 $ 0.0
State 0.4 1.5 0.2
Total Current Income Taxes 0.8 5.8 0.2
Deferred Income Tax Provision      
Federal 8.6 4.8 6.6
State 4.6 2.6 4.4
Total Deferred Income Taxes 13.2 7.4 11.0
Total Income Tax Expense $ 14.0 $ 13.2 $ 11.2