XML 107 R81.htm IDEA: XBRL DOCUMENT v3.25.0.1
Income Tax Expense (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Current Income Tax Expense      
Federal $ 8.4 $ 9.4 $ 1.2
State 12.1 0.9 6.1
Total Current Income Tax Expense 20.5 10.3 7.3
Deferred Income Tax Expense (Benefit)      
Federal (20.1) (6.0) (32.8)
State 5.0 24.0 (5.2)
Investment Tax Credit Amortization (0.7) (0.4) (0.5)
Total Deferred Income Tax Expense (Benefit) (15.8) 17.6 (38.5)
Total Income Tax Expense (Benefit) $ 4.7 $ 27.9 $ (31.2)