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Report of Business Segments - Summary of OGE Energy's Business Segments (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Segment Reporting Information [Line Items]      
Operating revenues $ 596.8 $ 557.2  
Fuel, purchased power and direct transmission expense 232.2 200.6  
Other operation and maintenance 132.4 130.4  
Depreciation and amortization 129.2 121.2  
Taxes other than income 29.0 28.5  
OPERATING INCOME 74.0 76.5  
Other income 6.4 16.4  
Interest expense 60.2 47.8  
Income tax expense (benefit) 1.6 6.8  
Net income (loss) 18.6 38.3  
Total assets 12,918.0 12,790.3 $ 12,790.7
Operating Segments [Member] | Electric Company [Member]      
Segment Reporting Information [Line Items]      
Operating revenues 596.8 557.2  
Fuel, purchased power and direct transmission expense 232.2 200.6  
Other operation and maintenance 132.4 131.5  
Depreciation and amortization 129.2 121.2  
Taxes other than income 29.0 27.1  
OPERATING INCOME 74.0 76.8  
Other income 6.6 15.3  
Interest expense 51.4 45.7  
Income tax expense (benefit) 4.0 6.6  
Net income (loss) 25.2 39.8  
Total assets 12,771.1 12,762.7  
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 (1.1)  
Depreciation and amortization 0.0 0.0  
Taxes other than income 0.0 1.4  
OPERATING INCOME 0.0 (0.3)  
Other income 1.5 4.5  
Interest expense 10.5 5.5  
Income tax expense (benefit) (2.4) 0.2  
Net income (loss) (6.6) (1.5)  
Total assets 375.1 587.1  
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 (1.7) (3.4)  
Interest expense (1.7) (3.4)  
Income tax expense (benefit) 0.0 0.0  
Net income (loss) 0.0 0.0  
Total assets $ (228.2) $ (559.5)