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v3.8.0.1

Report of Business Segments (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Sep. 30, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues | $ 501.9 | $ 716.8 | $ 586.4 | $ 456.0 | $ 530.8 | $ 743.9 | $ 551.4 | $ 433.1 |  | $ 2,261.1 | $ 2,259.2 | $ 2,196.9
Cost of sales |  |  |  |  |  |  |  |  |  | 897.6 | 880.1 | 865.0
Other operation and maintenance |  |  |  |  |  |  |  |  |  | 480.3 | 465.6 | 451.6
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 283.5 | 322.6 | 307.9
Taxes other than income |  |  |  |  |  |  |  |  |  | 89.4 | 87.6 | 91.2
Operating income (loss) | 79.7 | 243.3 | 143.5 | 43.8 | 82.2 | 257.3 | 125.9 | 37.9 |  | 510.3 | 503.3 | 481.2
Equity in earnings of unconsolidated affiliates |  |  |  |  |  |  |  |  |  | 131.2 | 101.8 | 15.5
Other income (expense) |  |  |  |  |  |  |  |  |  | 72.0 | 23.3 | 21.0
Interest expense |  |  |  |  |  |  |  |  |  | 143.8 | 142.1 | 149.0
Income tax expense (benefit) (A) |  |  |  |  |  |  |  |  |  | (49.3) | 148.1 | 97.4
NET INCOME | 294.8 | $ 183.4 | $ 104.8 | $ 36.0 | 57.9 | $ 183.6 | $ 71.5 | $ 25.2 |  | 619.0 | 338.2 | 271.3
Investment in unconsolidated affiliates | 1,160.4 |  |  |  | 1,158.6 |  |  |  |  | 1,160.4 | 1,158.6 | 1,194.4
Total assets | 10,412.7 |  |  |  | 9,939.6 |  |  |  |  | 10,412.7 | 9,939.6 | 9,580.6
Capital expenditures |  |  |  |  |  |  |  |  |  | 824.1 | 660.1 | 547.8
Electric Utility [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  |  | 2,261.1 | 2,259.2 | 2,196.9
Cost of sales |  |  |  |  |  |  |  |  |  | 897.6 | 880.1 | 865.0
Other operation and maintenance |  |  |  |  |  |  |  |  |  | 486.1 | 469.8 | 444.5
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 280.9 | 316.4 | 299.9
Taxes other than income |  |  |  |  |  |  |  |  |  | 84.8 | 84.0 | 87.1
Operating income (loss) |  |  |  |  |  |  |  |  |  | 511.7 | 508.9 | 500.4
Equity in earnings of unconsolidated affiliates |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Other income (expense) |  |  |  |  |  |  |  |  |  | 74.0 | 27.7 | 20.0
Interest expense |  |  |  |  |  |  |  |  |  | 138.4 | 138.1 | 146.7
Income tax expense (benefit) (A) |  |  |  |  |  |  |  |  |  | 141.8 | 114.4 | 104.8
NET INCOME |  |  |  |  |  |  |  |  |  | 305.5 | 284.1 | 268.9
Investment in unconsolidated affiliates | 0.0 |  |  |  | 0.0 |  |  |  |  | 0.0 | 0.0 | 0.0
Total assets | 9,255.6 |  |  |  | 8,669.4 |  |  |  |  | 9,255.6 | 8,669.4 | 8,525.5
Capital expenditures |  |  |  |  |  |  |  |  |  | 824.1 | 660.1 | 551.6
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 |  |  |  |  |  |  |  |  |  | 0.3 | 7.7 | 7.5
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Taxes other than income |  |  |  |  |  |  |  |  |  | 1.0 | 0.0 | 0.0
Operating income (loss) |  |  |  |  |  |  |  |  |  | (1.3) | (7.7) | (7.5)
Equity in earnings of unconsolidated affiliates |  |  |  |  |  |  |  |  |  | 131.2 | 101.8 | 15.5
Other income (expense) |  |  |  |  |  |  |  |  |  | 0.1 | 0.1 | 0.4
Interest expense |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Income tax expense (benefit) (A) |  |  |  |  |  |  |  |  |  | (195.2) | 40.5 | (1.0)
NET INCOME |  |  |  |  |  |  |  |  |  | 325.2 | 53.7 | 9.4
Investment in unconsolidated affiliates | 1,151.9 |  |  |  | 1,158.6 |  |  |  |  | 1,151.9 | 1,158.6 | 1,194.4
Total assets | 1,155.3 |  |  |  | 1,521.6 |  |  |  |  | 1,155.3 | 1,521.6 | 1,439.5
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 |  |  |  |  |  |  |  |  |  | (6.1) | (11.9) | (0.4)
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 2.6 | 6.2 | 8.0
Taxes other than income |  |  |  |  |  |  |  |  |  | 3.6 | 3.6 | 4.1
Operating income (loss) |  |  |  |  |  |  |  |  |  | (0.1) | 2.1 | (11.7)
Equity in earnings of unconsolidated affiliates |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Other income (expense) |  |  |  |  |  |  |  |  |  | (1.2) | (4.3) | 0.9
Interest expense |  |  |  |  |  |  |  |  |  | 6.3 | 4.2 | 2.6
Income tax expense (benefit) (A) |  |  |  |  |  |  |  |  |  | 4.1 | (6.8) | (6.4)
NET INCOME |  |  |  |  |  |  |  |  |  | (11.7) | 0.4 | (7.0)
Investment in unconsolidated affiliates | 8.5 |  |  |  | 0.0 |  |  |  |  | 8.5 | 0.0 | 0.0
Total assets | 109.1 |  |  |  | 89.0 |  |  |  |  | 109.1 | 89.0 | 174.6
Capital expenditures |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | (3.8)
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) |  |  |  |  |  |  |  |  |  | (0.9) | (0.2) | (0.3)
Interest expense |  |  |  |  |  |  |  |  |  | (0.9) | (0.2) | (0.3)
Income tax expense (benefit) (A) |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
NET INCOME |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Investment in unconsolidated affiliates | 0.0 |  |  |  | 0.0 |  |  |  |  | 0.0 | 0.0 | 0.0
Total assets | (107.3) |  |  |  | $ (340.4) |  |  |  |  | (107.3) | (340.4) | (559.0)
Capital expenditures |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
OGE Energy [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Goodwill, Impairment Loss |  |  |  |  |  |  |  |  | $ 108.4 | $ 0.0 | $ (2.6) | $ (178.4)
Tax Benefit Due to Tax Law Change [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Income tax expense (benefit) (A) | 245.2 |  |  |  |  |  |  |  |  |  |  |
Tax Expense Due to Tax Law Change [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Income tax expense (benefit) (A) | $ 10.5 |  |  |  |  |  |  |  |  |  |  |

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