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v3.19.3.a.u2

Report of Business Segments (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues | $ 472.5 | $ 755.4 | $ 513.7 | $ 490.0 | $ 511.8 | $ 698.8 | $ 567.0 | $ 492.7 | $ 2,231.6 | $ 2,270.3 | $ 2,261.1 |
Cost of sales |  |  |  |  |  |  |  |  | 786.9 | 892.5 | 897.6 |
Other operation and maintenance |  |  |  |  |  |  |  |  | 491.8 | 474.6 | 458.7 |
Depreciation and amortization |  |  |  |  |  |  |  |  | 355.0 | 321.6 | 283.5 |
Taxes other than income |  |  |  |  |  |  |  |  | 93.6 | 92.0 | 89.4 |
Operating income (loss) | 70.3 | 274.3 | 110.0 | 49.7 | 58.0 | 227.3 | 137.7 | 66.6 | 504.3 | 489.6 | 531.9 |
Equity in earnings of unconsolidated affiliates |  |  |  |  |  |  |  |  | 113.9 | 152.8 | 131.2 |
Other income (expense) |  |  |  |  |  |  |  |  | (6.9) | 11.3 | 50.4 |
Interest expense |  |  |  |  |  |  |  |  | 147.9 | 156.0 | 143.8 |
Income tax expense (benefit) |  |  |  |  |  |  |  |  | 29.8 | 72.2 | (49.3) | [1]
NET INCOME | 35.4 | $ 250.9 | $ 100.2 | $ 47.1 | 54.7 | $ 205.1 | $ 110.7 | $ 55.0 | 433.6 | 425.5 | 619.0 |
Investment in unconsolidated affiliates | 1,151.5 |  |  |  | 1,177.5 |  |  |  | 1,151.5 | 1,177.5 | 1,160.4 |
Total assets | 11,024.3 |  |  |  | 10,748.6 |  |  |  | 11,024.3 | 10,748.6 | 10,412.7 |
Capital expenditures |  |  |  |  |  |  |  |  | 635.5 | 573.6 | 824.1 |
Electric Utility [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 2,231.6 | 2,270.3 | 2,261.1 |
Cost of sales |  |  |  |  |  |  |  |  | 786.9 | 892.5 | 897.6 |
Other operation and maintenance |  |  |  |  |  |  |  |  | 492.5 | 473.8 | 469.8 |
Depreciation and amortization |  |  |  |  |  |  |  |  | 355.0 | 321.6 | 280.9 |
Taxes other than income |  |  |  |  |  |  |  |  | 89.5 | 88.2 | 84.8 |
Operating income (loss) |  |  |  |  |  |  |  |  | 507.7 | 494.2 | 528.0 |
Equity in earnings of unconsolidated affiliates |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0 |
Other income (expense) |  |  |  |  |  |  |  |  | 3.1 | 25.6 | 57.7 |
Interest expense |  |  |  |  |  |  |  |  | 140.5 | 151.8 | 138.4 |
Income tax expense (benefit) |  |  |  |  |  |  |  |  | 20.1 | 40.0 | 141.8 | [1]
NET INCOME |  |  |  |  |  |  |  |  | 350.2 | 328.0 | 305.5 |
Investment in unconsolidated affiliates | 0.0 |  |  |  | 0.0 |  |  |  | 0.0 | 0.0 | 0.0 |
Total assets | 10,076.6 |  |  |  | 9,704.5 |  |  |  | 10,076.6 | 9,704.5 | 9,255.6 |
Capital expenditures |  |  |  |  |  |  |  |  | 635.5 | 573.6 | 824.1 |
Natural Gas Midstream Operations [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0 |
Cost of sales |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0 |
Other operation and maintenance |  |  |  |  |  |  |  |  | 2.8 | 1.4 | (0.8) |
Depreciation and amortization |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0 |
Taxes other than income |  |  |  |  |  |  |  |  | 0.4 | 0.6 | 1.0 |
Operating income (loss) |  |  |  |  |  |  |  |  | (3.2) | (2.0) | (0.2) |
Equity in earnings of unconsolidated affiliates |  |  |  |  |  |  |  |  | 113.9 | 152.8 | 131.2 |
Other income (expense) |  |  |  |  |  |  |  |  | (8.6) | (4.9) | (1.0) |
Interest expense |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0 |
Income tax expense (benefit) |  |  |  |  |  |  |  |  | 20.7 | 37.1 | (195.2) | [1]
NET INCOME |  |  |  |  |  |  |  |  | 81.4 | 108.8 | 325.2 |
Investment in unconsolidated affiliates | 1,132.9 |  |  |  | 1,166.6 |  |  |  | 1,132.9 | 1,166.6 | 1,151.9 |
Total assets | 1,135.4 |  |  |  | 1,169.8 |  |  |  | 1,135.4 | 1,169.8 | 1,155.3 |
Capital expenditures |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0 |
Other Operations [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0 |
Cost of sales |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0 |
Other operation and maintenance |  |  |  |  |  |  |  |  | (3.5) | (0.6) | (10.3) |
Depreciation and amortization |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 2.6 |
Taxes other than income |  |  |  |  |  |  |  |  | 3.7 | 3.2 | 3.6 |
Operating income (loss) |  |  |  |  |  |  |  |  | (0.2) | (2.6) | 4.1 |
Equity in earnings of unconsolidated affiliates |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0 |
Other income (expense) |  |  |  |  |  |  |  |  | 2.2 | (3.4) | (5.4) |
Interest expense |  |  |  |  |  |  |  |  | 11.0 | 10.2 | 6.3 |
Income tax expense (benefit) |  |  |  |  |  |  |  |  | (11.0) | (4.9) | 4.1 | [1]
NET INCOME |  |  |  |  |  |  |  |  | 2.0 | (11.3) | (11.7) |
Investment in unconsolidated affiliates | 18.6 |  |  |  | 10.9 |  |  |  | 18.6 | 10.9 | 8.5 |
Total assets | 107.0 |  |  |  | 184.8 |  |  |  | 107.0 | 184.8 | 109.1 |
Capital expenditures |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0 |
Eliminations [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0 |
Cost of sales |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0 |
Other operation and maintenance |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0 |
Depreciation and amortization |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0 |
Taxes other than income |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0 |
Operating income (loss) |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0 |
Equity in earnings of unconsolidated affiliates |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0 |
Other income (expense) |  |  |  |  |  |  |  |  | (3.6) | (6.0) | (0.9) |
Interest expense |  |  |  |  |  |  |  |  | (3.6) | (6.0) | (0.9) |
Income tax expense (benefit) |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0 | [1]
NET INCOME |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0 |
Investment in unconsolidated affiliates | 0.0 |  |  |  | 0.0 |  |  |  | 0.0 | 0.0 | 0.0 |
Total assets | $ (294.7) |  |  |  | $ (310.5) |  |  |  | (294.7) | (310.5) | (107.3) |
Capital expenditures |  |  |  |  |  |  |  |  | $ 0.0 | $ 0.0 | 0.0 |
Tax Benefit Due to Tax Law Change [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Income tax expense (benefit) |  |  |  |  |  |  |  |  |  |  | 245.2 |
Tax Expense Due to Tax Law Change [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Income tax expense (benefit) |  |  |  |  |  |  |  |  |  |  | $ 10.5 |
[1] | 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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