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Quarterly Financial Data (Schedule Of Quarterly Financial Data) (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Quarterly Financial Data [Abstract]                      
Operating Revenues $ 1,461.7 $ 895.0 $ 1,007.0 $ 1,750.8 $ 1,368.3 $ 917.0 $ 990.7 $ 1,598.6 $ 5,114.5 $ 4,874.6 $ 4,492.5
Operating Income (Loss) (78.4) (315.9) 118.4 400.6 270.6 111.2 124.0 415.4 124.7 921.2 866.1
Net Income (Loss) (11.7) [1] (339.5) [2] 24.5 276.1 [3] $ (52.4) [1] $ 14.0 $ (44.4) [4] $ 211.3 (50.6) 128.5 331.5
Preferred Dividends (8.1) (5.6) (1.3) 0.0         (15.0) 0.0 0.0
Net Income (Loss) Available to Common Stockholders $ (19.8) [1] $ (345.1) [2] $ 23.2 $ 276.1 [3]         $ (65.6) $ 128.5 $ 331.5
Basic Earnings (Loss) Per Share $ (0.05) $ (0.95) $ 0.07 $ 0.82 $ (0.16) $ 0.04 $ (0.14) $ 0.65 $ (0.18) $ 0.39 $ 1.03
Diluted Earnings (Loss) Per Share $ (0.05) $ (0.95) $ 0.07 $ 0.81 $ (0.16) $ 0.04 $ (0.14) $ 0.65 $ (0.18) $ 0.39 $ 1.02
[1] Net income for the fourth quarter of 2018 was impacted by approximately $426 million in expenses (pretax, net of insurance recoveries) related to the Greater Lawrence Incident restoration, partially offset by an interest rate swap settlement gain of $25.0 million (pretax) and a $120.7 million income tax benefit from true-ups to reflect regulatory outcomes associated with excess deferred income taxes. Net income for the fourth quarter of 2017 was impacted by a $161.1 million increase in tax expense as a result of implementing the provisions of the TCJA. See Note 18-E, "Other Matters," Note 9, "Risk Management Activities" and Note 10, "Income Taxes" for additional information.
[2] Net income for the third quarter of 2018 was impacted by approximately $462 million in expenses (pretax) related to the Greater Lawrence Incident restoration and a $33.0 million loss (pretax) on an early extinguishment of long-term debt. See Note 18-E, "Other Matters" and Note 14, "Long-Term Debt" for additional information.
[3] Net income for the first quarter of 2018 was impacted by an interest rate swap settlement gain of $21.2 million (pretax). See Note 9, "Risk Management Activities" for additional information.
[4] Net income for the second quarter of 2017 was impacted by a $111.5 million loss (pretax) on an early extinguishment of long-term debt. See Note 14, "Long-Term Debt" for additional information.