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Income Taxes (Schedule Of Reasons Behind Differences In Computation Of Total Income Taxes) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2018
Schedule of Reasons Behind Differences in Computation of Total Income Taxes [Line Items] |  |  |  |  |  |  |  |  |
Book income (loss) before income taxes | $ (31.3) |  |  | $ 506.6 |  |  | $ (230.6) |  |
Tax expense (benefit) at statutory federal income tax rate, value | (6.6) |  |  | 106.5 |  |  | (48.4) |  |
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) |  |  | 10.1 |  |  | 24.7 |  |
State income taxes, net of federal income tax benefit, rate |  | 37.40% |  |  | 2.00% |  |  | (10.70%) |
Amortization of regulatory liabilities, value | (38.4) |  |  | (29.4) |  |  | (29.3) |  |
Amortization of regulatory liabilities, rate |  | 122.70% |  |  | (5.80%) |  |  | 12.70% |
Goodwill impairment, value | 0.0 |  |  | 43.0 |  |  | 0.0 |  |
Goodwill impairment, rate |  | 0.00% |  |  | 8.50% |  |  | 0.00% |
Fines and penalties, value | 11.8 |  |  | 11.5 |  |  | 0.2 |  |
Fines and penalties, rate |  | (37.70%) |  |  | 2.30% |  |  | (0.10%) |
Charitable contribution carryover, value | 0.0 |  |  | (2.5) |  |  | 0.0 |  |
Charitable contribution carryover, rate |  | 0.00% |  |  | (0.50%) |  |  | 0.00% |
State regulatory proceedings, value | 0.0 |  |  | (9.5) |  |  | (127.8) |  |
State regulatory proceedings, rate |  | 0.00% |  |  | (1.90%) |  |  | 55.40% |
Employee stock ownership plan dividends and other compensation, value | (1.3) |  |  | (2.0) |  |  | (2.2) |  |
Employee stock ownership plan dividends and other compensation, rate |  | 4.20% |  |  | (0.40%) |  |  | 1.00% |
Effective Income Tax Rate Reconciliation, Tax Cuts and Jobs Act, Amount | 23.3 |  |  | 0.0 |  |  | 0.0 |  |
Effective Income Tax Rate Reconciliation, Tax Cuts and Jobs Act, Percent |  | (0.745) |  |  | 0 |  |  | 0 |
Effective Income Tax Rate Reconciliation Tax Accrual Adjustments | 8.9 |  |  | 0.0 |  |  | 0.0 |  |
Effective Income Tax Rate Reconciliation, Tax Accrual Adjustments, Percent |  | (28.40%) |  |  | 0.00% |  |  | 0.00% |
Effective Income Tax Rate Reconciliation, Tax Credit, Amount | (2.5) |  |  | 0.0 |  |  | 0.0 |  |
Effective Income Tax Rate Reconciliation, Tax Credit, Percent |  | 8.00% |  |  | 0.00% |  |  | 0.00% |
Other adjustments, value | (0.6) |  |  | (4.2) |  |  | 2.8 |  |
Other adjustments, rate |  | 1.90% |  |  | (0.80%) |  |  | (1.20%) |
Income Taxes | $ (17.1) |  |  | $ 123.5 |  |  | $ (180.0) |  |
Income Taxes, rate |  | 54.60% | 54.60% |  | 24.40% | 24.40% |  | 78.10% | 78.10%

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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to tax credits. Including, but not limited to, research credit, foreign tax credit, investment tax credit, and other tax credits. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration