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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, 2024
Jun. 30, 2024
Mar. 31, 2024
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Segment Reporting Information [Line Items]                  
Operating revenues $ 965.4     $ 945.4     $ 2,224.8 $ 2,107.6  
Fuel, purchased power and direct transmission expense 350.1     333.8     776.2 716.2  
Other operation and maintenance 131.4     122.7     394.2 381.4  
Depreciation and amortization 144.0     132.5     408.7 377.8  
Taxes other than income 26.7     25.3     82.6 78.2  
OPERATING INCOME 313.2     331.1     563.1 554.0  
Other income (expense) 10.7     6.6     27.6 37.5  
Interest expense 64.2     57.4     189.3 162.9  
Income tax expense (benefit) 41.0     38.4     61.8 60.0  
Net income (loss) 218.7 $ 102.3 $ 18.6 241.9 $ 88.4 $ 38.3 339.6 368.6  
Total assets 13,475.8     12,743.2     13,475.8 12,743.2 $ 12,790.7
Operating Segments [Member] | Electric Company [Member]                  
Segment Reporting Information [Line Items]                  
Operating revenues 965.4     945.4     2,224.8 2,107.6  
Fuel, purchased power and direct transmission expense 350.1     333.8     776.2 716.2  
Other operation and maintenance 131.4     123.3     394.0 383.4  
Depreciation and amortization 144.0     132.5     408.7 377.8  
Taxes other than income 26.7     24.7     82.6 75.3  
OPERATING INCOME 313.2     331.1     563.3 554.9  
Other income (expense) 11.6     7.8     28.4 36.3  
Interest expense 54.1     51.0     160.4 148.8  
Income tax expense (benefit) 45.7     41.8     71.8 64.6  
Net income (loss) 225.0     246.1     359.5 377.8  
Total assets 13,360.5     12,610.6     13,360.5 12,610.6  
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 0.0     (0.6)     0.2 (2.0)  
Depreciation and amortization 0.0     0.0     0.0 0.0  
Taxes other than income 0.0     0.6     0.0 2.9  
OPERATING INCOME 0.0     0.0     (0.2) (0.9)  
Other income (expense) 0.0     (0.4)     3.2 8.5  
Interest expense 11.0     7.2     32.9 21.4  
Income tax expense (benefit) (4.7)     (3.4)     (10.0) (4.6)  
Net income (loss) (6.3)     (4.2)     (19.9) (9.2)  
Total assets 134.7     312.2     134.7 312.2  
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) (0.9)     (0.8)     (4.0) (7.3)  
Interest expense (0.9)     (0.8)     (4.0) (7.3)  
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 $ (19.4)     $ (179.6)     $ (19.4) $ (179.6)