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Report of Business Segments - Summary of OGE Energy's Business Segments (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Segment Reporting Information [Line Items]      
Operating revenues $ 747.7 $ 596.8  
Fuel, purchased power and direct transmission expense 324.0 232.2  
Other operation and maintenance 121.8 132.4  
Depreciation and amortization 137.4 129.2  
Taxes other than income 31.2 29.0  
OPERATING INCOME 133.3 74.0  
Other income 6.9 6.4  
Interest expense 67.3 60.2  
Income tax expense (benefit) 10.2 1.6  
Net income (loss) 62.7 18.6  
Total assets 13,953.2 12,918.0 $ 13,716.0
Capital expenditures 249.5 226.9  
Operating Segments [Member] | Electric Company [Member]      
Segment Reporting Information [Line Items]      
Operating revenues 747.7 596.8  
Fuel, purchased power and direct transmission expense 324.0 232.2  
Other operation and maintenance 121.8 132.4  
Depreciation and amortization 137.4 129.2  
Taxes other than income 31.2 29.0  
OPERATING INCOME 133.3 74.0  
Other income 8.9 6.6  
Interest expense 56.8 51.4  
Income tax expense (benefit) 14.4 4.0  
Net income (loss) 71.0 25.2  
Total assets 13,810.4 12,771.1  
Capital expenditures 249.5 226.9  
Operating Segments [Member] | Other Operations [Member]      
Segment Reporting Information [Line Items]      
Operating revenues 0.0 0.0  
Fuel, purchased power and direct transmission expense 0.0 0.0  
Other operation and maintenance 0.0 0.0  
Depreciation and amortization 0.0 0.0  
Taxes other than income 0.0 0.0  
OPERATING INCOME 0.0 0.0  
Other income 1.2 1.5  
Interest expense 13.7 10.5  
Income tax expense (benefit) (4.2) (2.4)  
Net income (loss) (8.3) (6.6)  
Total assets 582.6 375.1  
Capital expenditures 0.0 0.0  
Eliminations [Member]      
Segment Reporting Information [Line Items]      
Operating revenues 0.0 0.0  
Fuel, purchased power and direct transmission expense 0.0 0.0  
Other operation and maintenance 0.0 0.0  
Depreciation and amortization 0.0 0.0  
Taxes other than income 0.0 0.0  
OPERATING INCOME 0.0 0.0  
Other income (3.2) (1.7)  
Interest expense (3.2) (1.7)  
Income tax expense (benefit) 0.0 0.0  
Net income (loss) 0.0 0.0  
Total assets (439.8) (228.2)  
Capital expenditures $ 0.0 $ 0.0