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CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($)
$ in Millions
Total
OG&E [Member]
Common Stock
Common Stock
OG&E [Member]
Treasury Stock
Premium on Common Stock
Premium on Common Stock
OG&E [Member]
Retained Earnings
Retained Earnings
OG&E [Member]
Accumulated Other Comprehensive (Loss) Income
Balance at Dec. 31, 2021 $ 4,056.3 $ 4,602.8 $ 2.0 $ 100.9 $ (0.1) $ 1,123.8 $ 1,470.8 $ 2,955.4 $ 3,031.1 $ (24.8)
Common Stock, Shares, Outstanding at Dec. 31, 2021     200,100,000 40,400,000            
Treasury Stock, Common, Shares at Dec. 31, 2021         0          
Increase (Decrease) in Stockholders' Equity [Roll Forward]                    
Net income 665.7 439.5 $ 0.0 $ 0.0 $ 0.0 0.0 0.0 665.7 439.5 0.0
Net income, Number of Shares     0 0 0          
Other comprehensive income, net of tax, Number of Shares     0   0          
Other comprehensive income, net of tax 12.9 $ 0.0 $ 0.0   $ 0.0 0.0   0.0   12.9
Dividends declared on common stock, Number of Shares     0   0          
Dividends declared on common stock $ (330.2)   $ 0.0   $ 0.0 0.0   (330.2)   0.0
Issuance of common stock, Number of Shares 27,278 0                
Stock-based compensation, Number of Shares     100,000 0 0          
Stock-based compensation $ 8.7 $ 2.9 $ 0.0 $ 0.0 $ 0.0 8.7 2.9 0.0 0.0 0.0
Balance at Dec. 31, 2022 4,413.4 5,045.2 $ 2.0 $ 100.9 $ (0.1) 1,132.5 1,473.7 3,290.9 3,470.6 (11.9)
Common Stock, Shares, Outstanding at Dec. 31, 2022     200,200,000 40,400,000            
Treasury Stock, Common, Shares at Dec. 31, 2022         0          
Increase (Decrease) in Stockholders' Equity [Roll Forward]                    
Net income 416.8 426.4 $ 0.0 $ 0.0 $ 0.0 0.0 0.0 416.8 426.4 0.0
Net income, Number of Shares     0 0 0          
Other comprehensive income, net of tax, Number of Shares     0   0          
Other comprehensive income, net of tax 4.7 0.0 $ 0.0   $ 0.0 0.0   0.0   4.7
Dividends declared on common stock, Number of Shares     0 0 0          
Dividends declared on common stock $ (334.0) $ (500.0) $ 0.0 $ 0.0 $ 0.0 0.0 0.0 (334.0) (500.0) 0.0
Issuance of common stock, Number of Shares 82,321 0                
Stock-based compensation, Number of Shares     100,000 0 0          
Stock-based compensation $ 10.7 $ 3.1 $ 0.0 $ 0.0 $ 0.1 10.6 3.1 0.0 0.0 0.0
Balance at Dec. 31, 2023 $ 4,511.6 $ 4,974.7 $ 2.0 $ 100.9 $ 0.0 1,143.1 1,476.8 3,373.7 3,397.0 (7.2)
Common Stock, Shares, Outstanding at Dec. 31, 2023 200,300,000 40,400,000 200,300,000 40,400,000            
Treasury Stock, Common, Shares at Dec. 31, 2023         0          
Increase (Decrease) in Stockholders' Equity [Roll Forward]                    
Net income $ 441.5 $ 469.9 $ 0.0 $ 0.0 $ 0.0 0.0 0.0 441.5 469.9 0.0
Net income, Number of Shares     0 0 0          
Other comprehensive income, net of tax, Number of Shares     0   0          
Other comprehensive income, net of tax 4.5 0.0 $ 0.0   $ 0.0 0.0   0.0   4.5
Dividends declared on common stock, Number of Shares     0 0 0          
Dividends declared on common stock (339.5) $ (130.0) $ 0.0 $ 0.0 $ 0.0   0.0 (339.5) (130.0) 0.0
Issuance of common stock, Value $ 17.1   $ 0.0   $ 0.0 17.1   0.0   0.0
Issuance of common stock, Number of Shares 255,578 0 0.5   0          
Stock-based compensation, Number of Shares     200,000 0 0          
Stock-based compensation $ 5.7 $ 11.8 $ 0.0 $ 0.0 $ 0.0 5.7 11.8 0.0 0.0 0.0
Balance at Dec. 31, 2024 $ 4,640.9 $ 5,326.4 $ 2.0 $ 100.9 $ 0.0 $ 1,165.9 $ 1,488.6 $ 3,475.7 $ 3,736.9 $ (2.7)
Common Stock, Shares, Outstanding at Dec. 31, 2024 201,000,000 40,400,000 201,000,000 40,400,000            
Treasury Stock, Common, Shares at Dec. 31, 2024         0