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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.

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