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Income Taxes (Schedule Of Components Of Income Tax Expense) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Current
Federal	$ 0.2	$ 0.0	$ 0.0
State	11.7	5.2	8.2
Total Current	11.9	5.2	8.2
Deferred
Federal	(0.4)	110.7	(209.4)
State	(27.4)	9.0	22.2
Total Deferred	(27.8)	119.7	(187.2)
Deferred Investment Credits	(1.2)	(1.4)	(1.0)
Income Taxes	$ (17.1)	$ 123.5	$ (180.0)

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