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Quarterly Financial Data | 12 Months Ended
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Dec. 31, 2018
Quarterly Financial Data [Abstract] |
Quarterly Financial Data (Unaudited) | Quarterly Financial Data (Unaudited) Quarterly financial data does not always reveal the trend of our business operations due to nonrecurring items and seasonal weather patterns, which affect earnings and related components of revenue and operating income.
(in millions, except per share data) | First Quarter(1) |  | Second Quarter(2) |  | Third Quarter(3) |  | Fourth Quarter(4)
2018 |  |  |  |  |  |  |
Operating Revenues | $ | 1,750.8 |  |  | $ | 1,007.0 |  |  | $ | 895.0 |  |  | $ | 1,461.7 |
Operating Income (Loss) | 400.6 |  |  | 118.4 |  |  | (315.9 | ) |  | (78.4 | )
Net Income (Loss) | 276.1 |  |  | 24.5 |  |  | (339.5 | ) |  | (11.7 | )
Preferred Dividends | — |  |  | (1.3 | ) |  | (5.6 | ) |  | (8.1 | )
Net Income (Loss) Available to Common Shareholders | 276.1 |  |  | 23.2 |  |  | (345.1 | ) |  | (19.8 | )
Earnings (Loss) Per Share |  |  |  |  |  |  |
Basic Earnings (Loss) Per Share | $ | 0.82 |  |  | $ | 0.07 |  |  | $ | (0.95 | ) |  | $ | (0.05 | )
Diluted Earnings (Loss) Per Share | $ | 0.81 |  |  | $ | 0.07 |  |  | $ | (0.95 | ) |  | $ | (0.05 | )
2017 |  |  |  |  |  |  |
Operating Revenues | $ | 1,598.6 |  |  | $ | 990.7 |  |  | $ | 917.0 |  |  | $ | 1,368.3 |
Operating Income | 415.4 |  |  | 124.0 |  |  | 111.2 |  |  | 270.6 |
Net Income (Loss) | 211.3 |  |  | (44.4 | ) |  | 14.0 |  |  | (52.4 | )
Earnings (Loss) Per Share |  |  |  |  |  |  |
Basic Earnings (Loss) Per Share | $ | 0.65 |  |  | $ | (0.14 | ) |  | $ | 0.04 |  |  | $ | (0.16 | )
Diluted Earnings (Loss) Per Share | $ | 0.65 |  |  | $ | (0.14 | ) |  | $ | 0.04 |  |  | $ | (0.16 | )
(1) 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. (2) 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. (3) 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. (4) 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.

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- Definition The entire disclosure for quarterly financial data. Includes, but is not limited to, tabular presentation of financial information for fiscal quarters, effect of year-end adjustments, and an explanation of matters or transactions that affect comparability of the information. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -URI http://asc.fasb.org/topic&trid=2126967 + Details
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