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Income Tax Expense - Reconciliation of Taxes from Federal Statutory Rate to Total Income Tax Expense (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Reconciliation of Taxes from Federal Statutory Rate to Total Income Tax Expense [Abstract]      
Income Before Non-Controlling Interest and Income Taxes $ 126.4 $ 206.8 $ 100.1
Statutory Federal Income Tax Rate 21.00% 21.00% 21.00%
Income Taxes Computed at Statutory Federal Rate $ 26.5 $ 43.4 $ 21.0
Increase (Decrease) in Tax Due to:      
State Income Taxes – Net of Federal Income Tax Benefit 13.5 19.7 8.6
Deferred Revaluation – Net of Federal Income Tax Benefit 0.0 0.0 (7.9)
Production Tax Credits (32.4) (31.6) (50.7)
Investment Tax Credits (4.8) (5.8) (4.1)
Regulatory Differences – Excess Deferred Tax Benefit (9.9) (9.9) (9.1)
Non-Controlling Interest 11.0 13.3 11.2
AFUDC - Equity (1.5) (1.3) (1.1)
Transaction Costs 4.7 0.0 0.0
Other (2.4) 0.1 0.9
Total Income Tax Expense (Benefit) $ 4.7 $ 27.9 $ (31.2)