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Report of Business Segments (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenues |  | $ 2,122.3 |  | $ 2,231.6 | $ 2,270.3
Cost of sales |  | 644.6 |  | 786.9 | 892.5
Other operation and maintenance |  | 462.8 |  | 491.8 | 474.6
Depreciation and amortization |  | 391.3 |  | 355.0 | 321.6
Taxes other than income |  | 101.4 |  | 93.6 | 92.0
Operating income (loss) |  | 522.2 |  | 504.3 | 489.6
Equity in earnings of unconsolidated affiliates | [1] | (668.0) | [2] | 113.9 | 152.8
Other income (expense) |  | 3.2 |  | (6.9) | 11.3
Interest expense |  | 158.5 |  | 147.9 | 156.0
Income tax expense (benefit) |  | (127.4) |  | 29.8 | 72.2
NET INCOME (LOSS) |  | (173.7) |  | 433.6 | 425.5
Investment in unconsolidated affiliates |  | 397.4 |  | 1,151.5 | 1,177.5
Total assets |  | 10,718.8 |  | 11,024.3 | 10,748.6
Capital expenditures |  | 650.5 |  | 635.5 | 573.6
Equity Method Investment, Other than Temporary Impairment |  | 780.0 |  | 0.0 | 0.0
Electric Utility [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenues |  | 2,122.3 |  | 2,231.6 | 2,270.3
Cost of sales |  | 644.6 |  | 786.9 | 892.5
Other operation and maintenance |  | 464.4 |  | 492.5 | 473.8
Depreciation and amortization |  | 391.3 |  | 355.0 | 321.6
Taxes other than income |  | 97.2 |  | 89.5 | 88.2
Operating income (loss) |  | 524.8 |  | 507.7 | 494.2
Equity in earnings of unconsolidated affiliates |  | 0.0 | [2] | 0.0 | 0.0
Other income (expense) |  | 4.1 |  | 3.1 | 25.6
Interest expense |  | 154.8 |  | 140.5 | 151.8
Income tax expense (benefit) |  | 34.7 |  | 20.1 | 40.0
NET INCOME (LOSS) |  | 339.4 |  | 350.2 | 328.0
Investment in unconsolidated affiliates |  | 0.0 |  | 0.0 | 0.0
Total assets |  | 10,489.0 |  | 10,076.6 | 9,704.5
Capital expenditures |  | 650.5 |  | 635.5 | 573.6
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 |  | 1.7 |  | 2.8 | 1.4
Depreciation and amortization |  | 0.0 |  | 0.0 | 0.0
Taxes other than income |  | 0.4 |  | 0.4 | 0.6
Operating income (loss) |  | (2.1) |  | (3.2) | (2.0)
Equity in earnings of unconsolidated affiliates |  | (668.0) | [2] | 113.9 | 152.8
Other income (expense) |  | (2.9) |  | (8.6) | (4.9)
Interest expense |  | 0.0 |  | 0.0 | 0.0
Income tax expense (benefit) |  | (158.0) |  | 20.7 | 37.1
NET INCOME (LOSS) |  | (515.0) |  | 81.4 | 108.8
Investment in unconsolidated affiliates |  | 374.3 |  | 1,132.9 | 1,166.6
Total assets |  | 378.1 |  | 1,135.4 | 1,169.8
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 |  | (3.3) |  | (3.5) | (0.6)
Depreciation and amortization |  | 0.0 |  | 0.0 | 0.0
Taxes other than income |  | 3.8 |  | 3.7 | 3.2
Operating income (loss) |  | (0.5) |  | (0.2) | (2.6)
Equity in earnings of unconsolidated affiliates |  | 0.0 | [2] | 0.0 | 0.0
Other income (expense) |  | 3.6 |  | 2.2 | (3.4)
Interest expense |  | 5.3 |  | 11.0 | 10.2
Income tax expense (benefit) |  | (4.1) |  | (11.0) | (4.9)
NET INCOME (LOSS) |  | 1.9 |  | 2.0 | (11.3)
Investment in unconsolidated affiliates |  | 23.1 |  | 18.6 | 10.9
Total assets |  | 116.4 |  | 107.0 | 184.8
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 | [2] | 0.0 | 0.0
Other income (expense) |  | (1.6) |  | (3.6) | (6.0)
Interest expense |  | (1.6) |  | (3.6) | (6.0)
Income tax expense (benefit) |  | 0.0 |  | 0.0 | 0.0
NET INCOME (LOSS) |  | 0.0 |  | 0.0 | 0.0
Investment in unconsolidated affiliates |  | 0.0 |  | 0.0 | 0.0
Total assets |  | (264.7) |  | (294.7) | (310.5)
Capital expenditures |  | $ 0.0 |  | $ 0.0 | $ 0.0
[1] | For the year ended December 31, 2020, Enable recorded a $225.0 million impairment on its SESH equity method investment. Enable estimated the fair value of this equity method investment was below the carrying value at September 30, 2020 and concluded the decline in value was other than temporary due to the expiration of a transportation contract and the current status of renewal negotiations. The impairment ran through OGE Energy's portion of Enable net income and was offset by basis differences that flow through the amortization of basis difference and dilution recognition line item above.
[2] | In March 2020, OGE Energy recorded a $780.0 million impairment on its investment in Enable, as further discussed in Notes 5 and 7.

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