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Report of Business Segments | 12 Months Ended
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Dec. 31, 2019
Segment Reporting Information [Line Items] |
Report of Business Segments | Report of Business Segments The Company reports its operations in two business segments: (i) the electric utility segment, which is engaged in the generation, transmission, distribution and sale of electric energy and (ii) natural gas midstream operations segment. Other operations primarily includes the operations of the holding company. Intersegment revenues are recorded at prices comparable to those of unaffiliated customers and are affected by regulatory considerations. The following tables summarize the results of the Company's business segments for the years ended December 31, 2019, 2018 and 2017.
2019 | Electric Utility | Natural Gas Midstream Operations | Other Operations | Eliminations | Total
(In millions) |  |  |  |  |
Operating revenues | $ | 2,231.6 |  | $ | — |  | $ | — |  | $ | — |  | $ | 2,231.6 |
Cost of sales | 786.9 |  | — |  | — |  | — |  | 786.9 |
Other operation and maintenance | 492.5 |  | 2.8 |  | (3.5) |  | — |  | 491.8 |
Depreciation and amortization | 355.0 |  | — |  | — |  | — |  | 355.0 |
Taxes other than income | 89.5 |  | 0.4 |  | 3.7 |  | — |  | 93.6 |
Operating income (loss) | 507.7 |  | (3.2) |  | (0.2) |  | — |  | 504.3 |
Equity in earnings of unconsolidated affiliates | — |  | 113.9 |  | — |  | — |  | 113.9 |
Other income (expense) | 3.1 |  | (8.6) |  | 2.2 |  | (3.6) |  | (6.9) |
Interest expense | 140.5 |  | — |  | 11.0 |  | (3.6) |  | 147.9 |
Income tax expense (benefit) | 20.1 |  | 20.7 |  | (11.0) |  | — |  | 29.8 |
Net income | $ | 350.2 |  | $ | 81.4 |  | $ | 2.0 |  | $ | — |  | $ | 433.6 |
Investment in unconsolidated affiliates | $ | — |  | $ | 1,132.9 |  | $ | 18.6 |  | $ | — |  | $ | 1,151.5 |
Total assets | $ | 10,076.6 |  | $ | 1,135.4 |  | $ | 107.0 |  | $ | (294.7) |  | $ | 11,024.3 |
Capital expenditures | $ | 635.5 |  | $ | — |  | $ | — |  | $ | — |  | $ | 635.5 |
2018 | Electric Utility | Natural Gas Midstream Operations | Other Operations | Eliminations | Total
(In millions) |  |  |  |  |
Operating revenues | $ | 2,270.3 |  | $ | — |  | $ | — |  | $ | — |  | $ | 2,270.3 |
Cost of sales | 892.5 |  | — |  | — |  | — |  | 892.5 |
Other operation and maintenance | 473.8 |  | 1.4 |  | (0.6) |  | — |  | 474.6 |
Depreciation and amortization | 321.6 |  | — |  | — |  | — |  | 321.6 |
Taxes other than income | 88.2 |  | 0.6 |  | 3.2 |  | — |  | 92.0 |
Operating income (loss) | 494.2 |  | (2.0) |  | (2.6) |  | — |  | 489.6 |
Equity in earnings of unconsolidated affiliates | — |  | 152.8 |  | — |  | — |  | 152.8 |
Other income (expense) | 25.6 |  | (4.9) |  | (3.4) |  | (6.0) |  | 11.3 |
Interest expense | 151.8 |  | — |  | 10.2 |  | (6.0) |  | 156.0 |
Income tax expense (benefit) | 40.0 |  | 37.1 |  | (4.9) |  | — |  | 72.2 |
Net income (loss) | $ | 328.0 |  | $ | 108.8 |  | $ | (11.3) |  | $ | — |  | $ | 425.5 |
Investment in unconsolidated affiliates | $ | — |  | $ | 1,166.6 |  | $ | 10.9 |  | $ | — |  | $ | 1,177.5 |
Total assets | $ | 9,704.5 |  | $ | 1,169.8 |  | $ | 184.8 |  | $ | (310.5) |  | $ | 10,748.6 |
Capital expenditures | $ | 573.6 |  | $ | — |  | $ | — |  | $ | — |  | $ | 573.6 |
2017 | Electric Utility | Natural Gas Midstream Operations | Other Operations | Eliminations | Total
(In millions) |  |  |  |  |
Operating revenues | $ | 2,261.1 |  | $ | — |  | $ | — |  | $ | — |  | $ | 2,261.1 |
Cost of sales | 897.6 |  | — |  | — |  | — |  | 897.6 |
Other operation and maintenance | 469.8 |  | (0.8) |  | (10.3) |  | — |  | 458.7 |
Depreciation and amortization | 280.9 |  | — |  | 2.6 |  | — |  | 283.5 |
Taxes other than income | 84.8 |  | 1.0 |  | 3.6 |  | — |  | 89.4 |
Operating income (loss) | 528.0 |  | (0.2) |  | 4.1 |  | — |  | 531.9 |
Equity in earnings of unconsolidated affiliates | — |  | 131.2 |  | — |  | — |  | 131.2 |
Other income (expense) | 57.7 |  | (1.0) |  | (5.4) |  | (0.9) |  | 50.4 |
Interest expense | 138.4 |  | — |  | 6.3 |  | (0.9) |  | 143.8 |
Income tax expense (benefit) (A) | 141.8 |  | (195.2) |  | 4.1 |  | — |  | (49.3) |
Net income (loss) | $ | 305.5 |  | $ | 325.2 |  | $ | (11.7) |  | $ | — |  | $ | 619.0 |
Investment in unconsolidated affiliates | $ | — |  | $ | 1,151.9 |  | $ | 8.5 |  | $ | — |  | $ | 1,160.4 |
Total assets | $ | 9,255.6 |  | $ | 1,155.3 |  | $ | 109.1 |  | $ | (107.3) |  | $ | 10,412.7 |
Capital expenditures | $ | 824.1 |  | $ | — |  | $ | — |  | $ | — |  | $ | 824.1 |
(A)The Company recorded an income tax benefit of $245.2 million and income tax expense of $10.5 million during the fourth quarter of 2017 due to the Company remeasuring deferred taxes related to the natural gas midstream operations and other operations segments, respectively, as a result of the 2017 Tax Act.

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- Definition The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -URI http://asc.fasb.org/topic&trid=2134510 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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