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Report of Business Segments - Summary of OGE Energy's Business Segments (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Mar. 31, 2026
Jun. 30, 2025
Mar. 31, 2025
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Segment Reporting Information [Line Items]              
Operating revenues $ 711.9   $ 741.6   $ 1,464.5 $ 1,489.3  
Fuel, purchased power and direct transmission expense 217.7   261.1   554.4 585.1  
Other operation and maintenance 138.7   127.1   275.2 248.9  
Depreciation and amortization 138.1   140.6   274.5 278.0  
Taxes other than income 25.8   26.2   55.7 57.4  
OPERATING INCOME 191.6   186.6   304.7 319.9  
Net other income 12.9   15.1   19.1 22.0  
Interest expense 66.7   72.2   126.6 139.5  
Income tax expense (benefit) 21.5   22.0   30.7 32.2  
Net income (loss) 116.3 $ 50.2 107.5 $ 62.7 166.5 170.2  
Total assets 14,626.6   14,089.1   14,626.6 14,089.1 $ 14,370.5
Capital expenditures 221.8   273.7   488.6 523.2  
Operating Segments [Member] | Electric Company [Member]              
Segment Reporting Information [Line Items]              
Operating revenues 711.9   741.6   1,464.5 1,489.3  
Fuel, purchased power and direct transmission expense 217.7   261.1   554.4 585.1  
Other operation and maintenance 138.6   126.3   275.4 248.1  
Depreciation and amortization 138.1   140.6   274.5 278.0  
Taxes other than income 25.8   26.2   55.7 57.4  
OPERATING INCOME 191.7   187.4   304.5 320.7  
Net other income 10.6   7.0   17.5 15.9  
Interest expense 58.4   63.4   108.4 120.2  
Income tax expense (benefit) 23.8   23.3   35.6 37.7  
Net income (loss) 120.1   107.7   178.0 178.7  
Total assets 15,026.3   13,990.8   15,026.3 13,990.8  
Capital expenditures 221.8   273.7   488.6 523.2  
Operating Segments [Member] | 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 0.1   0.8   (0.2) 0.8  
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)   (0.8)   0.2 (0.8)  
Net other income 5.8   9.0   5.5 10.2  
Interest expense 11.8   9.7   22.1 23.4  
Income tax expense (benefit) (2.3)   (1.3)   (4.9) (5.5)  
Net income (loss) (3.8)   (0.2)   (11.5) (8.5)  
Total assets 125.3   140.4   125.3 140.4  
Capital expenditures 0.0   0.0   0.0 0.0  
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  
Net other income (3.5)   (0.9)   (3.9) (4.1)  
Interest expense (3.5)   (0.9)   (3.9) (4.1)  
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 (525.0)   (42.1)   (525.0) (42.1)  
Capital expenditures $ 0.0   $ 0.0   $ 0.0 $ 0.0