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Income Taxes (Schedule Of Components Of Income Tax Expense) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Current      
State $ 8.2 $ 7.8 $ (0.1)
Federal 0.0 0.0 0.0
Total Current 8.2 7.8 (0.1)
Deferred      
Federal (209.4) 302.7 165.6
State 22.2 5.0 18.0
Total Deferred (187.2) 307.7 183.6
Deferred Investment Credits (1.0) (1.0) (1.4)
Income Taxes $ (180.0) $ 314.5 $ 182.1