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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