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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, 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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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 exempt income, equity in earnings (loss) of an unconsolidated subsidiary, minority noncontrolling interest income (loss), tax holiday, disposition of a business, disposition of an asset, repatriation of foreign earnings, repatriation of foreign earnings jobs creation act of 2004, increase (decrease) in enacted tax rate, prior year income taxes, increase (decrease) in deferred tax asset valuation allowance, and other adjustments.

+ 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

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X

- 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 state and local income tax expense (benefit).

+ 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

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X

- 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

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Period Type:	duration