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Report of Business Segments (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015 | Dec. 31, 2015
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenues | $ 743.9 | $ 719.8 | $ 1,728.4 | $ 1,749.8 |
Cost of sales | 269.8 | 259.8 | 645.4 | 682.3 |
Other operation and maintenance | 113.1 | 109.4 | 354.6 | 334.3 |
Depreciation and amortization | 82.2 | 77.9 | 240.8 | 230.0 |
Taxes other than income | 21.5 | 21.9 | 66.5 | 68.8 |
OPERATING INCOME | 257.3 | 250.8 | 421.1 | 434.4 |
Equity in earnings of unconsolidated affiliates | 34.5 | (71.9) | 79.5 | (12.0) |
Other income | 6.3 | 5.8 | 17.3 | 16.3 |
Interest expense | 35.4 | 37.0 | 107.7 | 112.4 |
Income tax expense (benefit) | 79.1 | 36.5 | 129.9 | 84.4 |
Net income | 183.6 | 111.2 | 280.3 | 241.9 |
Investment in unconsolidated affiliates | 1,168.0 | 1,202.2 | 1,168.0 | 1,202.2 | $ 1,194.4
Total assets | 9,784.0 | 9,600.7 | 9,784.0 | 9,600.7 | $ 9,580.6
Electric Utility [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenues | 743.9 | 719.8 | 1,728.4 | 1,749.8 |
Cost of sales | 269.8 | 259.8 | 645.4 | 682.3 |
Other operation and maintenance | 115.2 | 107.4 | 356.3 | 337.3 |
Depreciation and amortization | 80.8 | 75.9 | 235.9 | 224.0 |
Taxes other than income | 20.9 | 21.0 | 63.6 | 65.7 |
OPERATING INCOME | 257.2 | 255.7 | 427.2 | 440.5 |
Equity in earnings of unconsolidated affiliates | 0.0 | 0.0 | 0.0 | 0.0 |
Other income | 6.0 | 6.6 | 18.3 | 13.9 |
Interest expense | 34.3 | 36.4 | 104.8 | 110.5 |
Income tax expense (benefit) | 69.0 | 63.0 | 102.4 | 94.9 |
Net income | 159.9 | 162.9 | 238.3 | 249.0 |
Investment in unconsolidated affiliates | 0.0 | 0.0 | 0.0 | 0.0 |
Total assets | 8,511.5 | 8,554.1 | 8,511.5 | 8,554.1 |
Natural Gas Midstream Operations [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenues | 0.0 | 0.0 | 0.0 | 0.0 |
Cost of sales | 0.0 | 0.0 | 0.0 | 0.0 |
Other operation and maintenance | (0.1) | 4.9 | 7.9 | 5.9 |
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 | 0.1 | (4.9) | (7.9) | (5.9) |
Equity in earnings of unconsolidated affiliates | 34.5 | (71.9) | 79.5 | (12.0) |
Other income | 0.0 | 0.0 | 0.0 | 0.0 |
Interest expense | 0.0 | 0.0 | 0.0 | 0.0 |
Income tax expense (benefit) | 12.1 | (26.8) | 31.5 | (8.7) |
Net income | 22.5 | (50.0) | 40.1 | (9.2) |
Investment in unconsolidated affiliates | 1,168.0 | 1,202.2 | 1,168.0 | 1,202.2 |
Total assets | 1,503.1 | 1,541.5 | 1,503.1 | 1,541.5 |
Other Operations [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenues | 0.0 | 0.0 | 0.0 | 0.0 |
Cost of sales | 0.0 | 0.0 | 0.0 | 0.0 |
Other operation and maintenance | (2.0) | (2.9) | (9.6) | (8.9) |
Depreciation and amortization | 1.4 | 2.0 | 4.9 | 6.0 |
Taxes other than income | 0.6 | 0.9 | 2.9 | 3.1 |
OPERATING INCOME | 0.0 | 0.0 | 1.8 | (0.2) |
Equity in earnings of unconsolidated affiliates | 0.0 | 0.0 | 0.0 | 0.0 |
Other income | 0.3 | (0.7) | (0.8) | 2.6 |
Interest expense | 1.1 | 0.7 | 3.1 | 2.1 |
Income tax expense (benefit) | (2.0) | 0.3 | (4.0) | (1.8) |
Net income | 1.2 | (1.7) | 1.9 | 2.1 |
Investment in unconsolidated affiliates | 0.0 | 0.0 | 0.0 | 0.0 |
Total assets | 93.3 | 133.5 | 93.3 | 133.5 |
Eliminations [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenues | 0.0 | 0.0 | 0.0 | 0.0 |
Cost of sales | 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 |
Equity in earnings of unconsolidated affiliates | 0.0 | 0.0 | 0.0 | 0.0 |
Other income | 0.0 | (0.1) | (0.2) | (0.2) |
Interest expense | 0.0 | (0.1) | (0.2) | (0.2) |
Income tax expense (benefit) | 0.0 | 0.0 | 0.0 | 0.0 |
Net income | 0.0 | 0.0 | 0.0 | 0.0 |
Investment in unconsolidated affiliates | 0.0 | 0.0 | 0.0 | 0.0 |
Total assets | (323.9) | (628.4) | (323.9) | (628.4) |
OGE Energy [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Goodwill, Impairment Loss | $ 0.0 | $ (177.7) | $ 0.6 | (177.7) |
Impairment Adjusted for Basis Difference [Member] | OGE Energy [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Goodwill, Impairment Loss |  |  |  | $ 108.4 |

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