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Income Taxes (Schedule Of Reasons Behind Differences In Computation Of Total Income Taxes) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Schedule of Reasons Behind Differences in Computation of Total Income Taxes [Line Items]      
Book income before income taxes $ 1,002.8 $ 813.9 $ 956.4
Tax expense (benefit) at statutory federal income tax rate, value $ 210.6 $ 170.8 $ 200.8
Tax expense (benefit) at statutory federal income tax rate, rate 21.00% 21.00% 21.00%
Increases (reductions) in taxes resulting from:      
State income taxes, net of federal income tax benefit, value $ 11.7 $ 13.7 $ 4.5
State income taxes, net of federal income tax benefit, rate 1.20% 1.70% 0.50%
Amortization of regulatory liabilities, value $ (11.1) $ (38.2) $ (38.5)
Amortization of regulatory liabilities, rate 1.10% 4.70% 4.00%
Employee stock ownership plan dividends and other compensation, value $ (1.3) $ (1.3) $ (1.2)
Employee stock ownership plan dividends and other compensation, rate (0.10%) (0.20%) (0.10%)
Effective Income Tax Rate Reconciliation, Tax Credit, Amount $ (23.3) $ (4.9) $ (2.3)
Effective Income Tax Rate Reconciliation, Tax Credit, Percent (2.30%) (0.60%) (0.20%)
Other adjustments, value $ (1.2) $ (0.6) $ 1.3
Other adjustments, rate 0.20% (0.10%) 0.00%
Income Taxes $ 158.1 $ 139.5 $ 164.6
Income Taxes, rate 15.80% 17.10% 17.20%