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Provisions for Federal and State Income Taxes (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Current Income Tax Provision      
Federal $ 0.0 $ 0.0 $ 0.3
State 0.2 0.7 0.6
Total Current Income Taxes 0.2 0.7 0.9
Deferred Income Tax Provision      
Federal 6.6 7.3 6.5
State 4.4 3.5 2.8
Total Deferred Income Taxes 11.0 10.8 9.3
Total Income Tax Expense $ 11.2 $ 11.5 $ 10.2