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INCOME TAX EXPENSE - Reconciliation of Taxes from Federal Statutory Rate to Total Income Tax Expense (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Reconciliation of Taxes from Federal Statutory Rate to Total Income Tax Expense [Abstract]    
Income Before Income Taxes $ 42.2 $ 41.0
Statutory Federal Income Tax Rate 21.00% 21.00%
Income Taxes Computed at Statutory Federal Rate $ 8.9 $ 8.6
Increase (Decrease) in Income Tax Due to:    
State Income Taxes – Net of Federal Income Tax Benefit 4.8 4.6
Production Tax Credits (4.8) (11.6)
Investment Tax Credits (2.8) (0.3)
Regulatory Differences – Excess Deferred Tax (2.6) (3.5)
Non-Controlling Interest in Subsidiaries 4.0 2.8
AFUDC – Equity (0.4) (0.6)
Nondeductible Portion of Transaction Costs 0.3 0.0
Other 0.1 4.0
Total Income Tax Expense $ 7.5 $ 4.0