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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, 2021
Dec. 31, 2020
Dec. 31, 2019
Schedule of Reasons Behind Differences in Computation of Total Income Taxes [Line Items]      
Book income (loss) before income taxes $ 706.6 $ (31.3) $ 506.6
Tax expense (benefit) at statutory federal income tax rate, value $ 148.3 $ (6.6) $ 106.5
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 $ 14.1 $ (11.7) $ 10.1
State income taxes, net of federal income tax benefit, rate 2.00% 37.40% 2.00%
Amortization of regulatory liabilities, value $ (39.1) $ (38.4) $ (29.4)
Amortization of regulatory liabilities, rate (5.50%) 122.70% (5.80%)
Goodwill impairment, value $ 0.0 $ 0.0 $ 43.0
Goodwill impairment, rate 0.00% 0.00% 8.50%
Fines and penalties, value $ 0.0 $ 11.8 $ 11.5
Fines and penalties, rate 0.00% (37.70%) 2.30%
Charitable contribution carryover, value $ 0.0 $ 0.0 $ (2.5)
Charitable contribution carryover, rate 0.00% 0.00% (0.50%)
State regulatory proceedings, value $ 0.0 $ 0.0 $ (9.5)
State regulatory proceedings, rate 0.00% 0.00% (1.90%)
Employee stock ownership plan dividends and other compensation, value $ (1.2) $ (1.3) $ (2.0)
Employee stock ownership plan dividends and other compensation, rate (0.20%) 4.20% (0.40%)
Effective Income Tax Rate Reconciliation, Tax Cuts and Jobs Act, Amount $ 0.0 $ 23.3 $ 0.0
Effective Income Tax Rate Reconciliation, Tax Cuts and Jobs Act, Percent 0 (0.745) 0
Effective Income Tax Rate Reconciliation Tax Accrual Adjustments $ (0.1) $ 8.9 $ 0.0
Effective Income Tax Rate Reconciliation, Tax Accrual Adjustments, Percent 0.00% (28.40%) 0.00%
Effective Income Tax Rate Reconciliation, Tax Credit, Amount $ (2.1) $ (2.5) $ 0.0
Effective Income Tax Rate Reconciliation, Tax Credit, Percent (0.30%) (8.00%) 0.00%
Other adjustments, value $ (2.1) $ (0.6) $ (4.2)
Other adjustments, rate (0.30%) 1.90% (0.80%)
Income Taxes $ 117.8 $ (17.1) $ 123.5
Income Taxes, rate 16.70% 54.60% 24.40%