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Income Taxes (Schedule Of Reasons Behind Differences In Computation Of Total Income Taxes) (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Schedule of Reasons Behind Differences in Computation of Total Income Taxes [Line Items]
Book income (loss) before income taxes		$ (230.6)	$ 443.0	$ 513.6
Tax expense (benefit) at statutory federal income tax rate, value		$ (48.4)	$ 155.0	$ 179.8
Tax expense (benefit) at statutory federal income tax rate, rate		21.00%	35.00%	35.00%
Increases (reductions) in taxes resulting from:
State income taxes, net of federal income tax benefit, value		$ 24.7	$ 6.9	$ 11.3
State income taxes, net of federal income tax benefit, rate		(10.70%)	1.50%	2.20%
Regulatory treatment of depreciation differences, value		$ (29.3)	$ (2.4)	$ (1.5)
Regulatory treatment of depreciation differences, rate		12.70%	(0.50%)	(0.30%)
Charitable contribution carryover, value		$ 0.0	$ (1.2)	$ (2.8)
Charitable contribution carryover, rate		(0.00%)	(0.30%)	(0.50%)
State regulatory proceedings, value		$ (127.8)	$ 0.0	$ 0.0
State regulatory proceedings, rate		55.40%	0.00%	0.00%
Remeasurement due to TCJA, value	$ 161.1	$ 0.0	$ 161.1	$ 0.0
Remeasurement due to TCJA, rate		0.00%	36.40%	0.00%
Employee stock ownership plan dividends and other compensation, value		$ (2.2)	$ (6.5)	$ (9.5)
Employee stock ownership plan dividends and other compensation, rate		1.00%	(1.50%)	(1.80%)
Other adjustments, value		$ 3.0	$ 1.6	$ (0.8)
Other adjustments, rate		(1.30%)	0.40%	(0.10%)
Income Taxes		$ (180.0)	$ 314.5	$ 182.1
Income Taxes, rate		78.10%	71.00%	35.50%

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