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v3.23.3

Report of Business Segments (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Sep. 30, 2022 | Jun. 30, 2022 | Mar. 31, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2022
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Operating revenues | $ 945.4 |  |  | $ 1,270.8 |  |  | $ 2,107.6 | $ 2,663.8 |
Fuel, purchased power and direct transmission expense | 333.8 |  |  | 673.8 |  |  | 716.2 | 1,322.8 |
Other operation and maintenance | 122.7 |  |  | 131.4 |  |  | 381.4 | 364.5 |
Depreciation and amortization | 132.5 |  |  | 122.4 |  |  | 377.8 | 341.4 |
Taxes other than income | 25.3 |  |  | 25.3 |  |  | 78.2 | 77.5 |
OPERATING INCOME | 331.1 |  |  | 317.9 |  |  | 554.0 | 557.6 |
Gain on equity securities | 0.0 |  |  | 39.4 |  |  | 0.0 | 282.1 |
Other income (expense) | 6.6 |  |  | (0.7) |  |  | 37.5 | 20.3 |
Interest expense | 57.4 |  |  | 42.2 |  |  | 162.9 | 124.7 |
Income tax expense (benefit) | 38.4 |  |  | 51.6 |  |  | 60.0 | 119.9 |
Net income (loss) | 241.9 | $ 88.4 | $ 38.3 | 262.8 | $ 73.1 | $ 279.5 | 368.6 | 615.4 |
Total assets | 12,743.2 |  |  | 12,604.0 |  |  | 12,743.2 | 12,604.0 | $ 12,544.7
Eliminations [Member] |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Operating revenues | 0.0 |  |  | 0.0 |  |  | 0.0 | 0.0 |
Fuel, purchased power and direct transmission expense | 0.0 |  |  | 0.0 |  |  | 0.0 | 0.0 |
Other operation and maintenance | 0.0 |  |  | 0.0 |  |  | 0.0 | 0.0 |
Depreciation and amortization | 0.0 |  |  | 0.0 |  |  | 0.0 | 0.0 |
Taxes other than income | 0.0 |  |  | 0.0 |  |  | 0.0 | 0.0 |
OPERATING INCOME | 0.0 |  |  | 0.0 |  |  | 0.0 | 0.0 |
Gain on equity securities |  |  |  | 0.0 |  |  |  | 0.0 |
Other income (expense) | (0.8) |  |  | (1.1) |  |  | (7.3) | (1.6) |
Interest expense | (0.8) |  |  | (1.1) |  |  | (7.3) | (1.6) |
Income tax expense (benefit) | 0.0 |  |  | 0.0 |  |  | 0.0 | 0.0 |
Net income (loss) | 0.0 |  |  | 0.0 |  |  | 0.0 | 0.0 |
Total assets | (179.6) |  |  | (565.0) |  |  | (179.6) | (565.0) |
Electrics Company [Member] |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Operating revenues | 945.4 |  |  | 1,270.8 |  |  | 2,107.6 | 2,663.8 |
Fuel, purchased power and direct transmission expense | 333.8 |  |  | 673.8 |  |  | 716.2 | 1,322.8 |
Other operation and maintenance | 123.3 |  |  | 121.5 |  |  | 383.4 | 355.3 |
Depreciation and amortization | 132.5 |  |  | 122.4 |  |  | 377.8 | 341.4 |
Taxes other than income | 24.7 |  |  | 24.5 |  |  | 75.3 | 74.6 |
OPERATING INCOME | 331.1 |  |  | 328.6 |  |  | 554.9 | 569.7 |
Gain on equity securities |  |  |  | 0.0 |  |  |  | 0.0 |
Other income (expense) | 7.8 |  |  | 5.6 |  |  | 36.3 | 6.0 |
Interest expense | 51.0 |  |  | 40.2 |  |  | 148.8 | 118.2 |
Income tax expense (benefit) | 41.8 |  |  | 40.9 |  |  | 64.6 | 64.7 |
Net income (loss) | 246.1 |  |  | 253.1 |  |  | 377.8 | 392.8 |
Total assets | 12,610.6 |  |  | 12,233.8 |  |  | 12,610.6 | 12,233.8 |
Natural Gas Midstream Operations [Member] |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  | 0.0 |  |  |  | 0.0 |
Fuel, purchased power and direct transmission expense |  |  |  | 0.0 |  |  |  | 0.0 |
Other operation and maintenance |  |  |  | 10.5 |  |  |  | 11.7 |
Depreciation and amortization |  |  |  | 0.0 |  |  |  | 0.0 |
Taxes other than income |  |  |  | 0.1 |  |  |  | 0.2 |
OPERATING INCOME |  |  |  | (10.6) |  |  |  | (11.9) |
Gain on equity securities |  |  |  | 39.4 |  |  |  | 282.1 |
Other income (expense) |  |  |  | (7.8) |  |  |  | 13.3 |
Interest expense |  |  |  | 0.0 |  |  |  | 0.0 |
Income tax expense (benefit) |  |  |  | 4.9 |  |  |  | 56.2 |
Net income (loss) |  |  |  | 16.1 |  |  |  | 227.3 |
Total assets |  |  |  | 1.3 |  |  |  | 1.3 |
Other Operations [Member] |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Operating revenues | 0.0 |  |  | 0.0 |  |  | 0.0 | 0.0 |
Fuel, purchased power and direct transmission expense | 0.0 |  |  | 0.0 |  |  | 0.0 | 0.0 |
Other operation and maintenance | (0.6) |  |  | (0.6) |  |  | (2.0) | (2.5) |
Depreciation and amortization | 0.0 |  |  | 0.0 |  |  | 0.0 | 0.0 |
Taxes other than income | 0.6 |  |  | 0.7 |  |  | 2.9 | 2.7 |
OPERATING INCOME | 0.0 |  |  | (0.1) |  |  | (0.9) | (0.2) |
Gain on equity securities |  |  |  | 0.0 |  |  |  | 0.0 |
Other income (expense) | (0.4) |  |  | 2.6 |  |  | 8.5 | 2.6 |
Interest expense | 7.2 |  |  | 3.1 |  |  | 21.4 | 8.1 |
Income tax expense (benefit) | (3.4) |  |  | 5.8 |  |  | (4.6) | (1.0) |
Net income (loss) | (4.2) |  |  | (6.4) |  |  | (9.2) | (4.7) |
Total assets | $ 312.2 |  |  | $ 933.9 |  |  | $ 312.2 | $ 933.9 |

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