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Report of Business Segments - Summary of OGE Energy's Business Segments (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Jun. 30, 2025
Mar. 31, 2025
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Segment Reporting Information [Line Items]                  
Operating revenues $ 1,045.0     $ 965.4     $ 2,534.3 $ 2,224.8  
Fuel, purchased power and direct transmission expense 388.5     350.1     973.6 776.2  
Other operation and maintenance 143.3     131.4     392.2 394.2  
Depreciation and amortization 146.7     144.0     424.7 408.7  
Taxes other than income 25.2     26.7     82.6 82.6  
OPERATING INCOME 341.3     313.2     661.2 563.1  
Other income (expense) 5.1     10.7     27.1 27.6  
Interest expense 69.6     64.2     209.1 189.3  
Income tax expense (benefit) 45.5     41.0     77.7 61.8  
Net income (loss) 231.3 $ 107.5 $ 62.7 218.7 $ 102.3 $ 18.6 401.5 339.6  
Total assets 14,257.4     13,475.8     14,257.4 13,475.8 $ 13,716.0
Capital expenditures 229.5     244.1     752.7 794.3  
Operating Segments [Member] | Electric Company [Member]                  
Segment Reporting Information [Line Items]                  
Operating revenues 1,045.0     965.4     2,534.3 2,224.8  
Fuel, purchased power and direct transmission expense 388.5     350.1     973.6 776.2  
Other operation and maintenance 143.5     131.4     391.6 394.0  
Depreciation and amortization 146.7     144.0     424.7 408.7  
Taxes other than income 25.2     26.7     82.6 82.6  
OPERATING INCOME 341.1     313.2     661.8 563.3  
Other income (expense) 7.3     11.6     23.2 28.4  
Interest expense 54.2     54.1     174.4 160.4  
Income tax expense (benefit) 51.3     45.7     89.0 71.8  
Net income (loss) 242.9     225.0     421.6 359.5  
Total assets 14,114.7     13,360.5     14,114.7 13,360.5  
Capital expenditures 229.5     244.1     752.7 794.3  
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 (0.2)     0.0     0.6 0.2  
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 0.2     0.0     (0.6) (0.2)  
Other income (expense) (0.7)     0.0     9.5 3.2  
Interest expense 16.9     11.0     40.3 32.9  
Income tax expense (benefit) (5.8)     (4.7)     (11.3) (10.0)  
Net income (loss) (11.6)     (6.3)     (20.1) (19.9)  
Total assets 221.4     134.7     221.4 134.7  
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  
Other income (expense) (1.5)     (0.9)     (5.6) (4.0)  
Interest expense (1.5)     (0.9)     (5.6) (4.0)  
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 (78.7)     (19.4)     (78.7) (19.4)  
Capital expenditures $ 0.0     $ 0.0     $ 0.0 $ 0.0