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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%

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