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CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (Unaudited) - USD ($)
$ in Millions
Total
OG&E [Member]
Common Stock
Common Stock
OG&E [Member]
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, 2023 $ 4,511.6 $ 4,974.7 $ 2.0 $ 100.9 $ 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          
Changes in Stockholders' Equity                  
Net income 18.6 25.2 $ 0.0 $ 0.0 0.0 0.0 18.6 25.2 0.0
Net income, Number of Shares     0 0          
Other comprehensive income, net of tax 3.9 0.0 $ 0.0   0.0   0.0   3.9
Other comprehensive income, net of tax, Number of Shares     0            
Dividends declared on common stock (86.1)   $ 0.0   0.0   (86.1)   0.0
Dividends declared on common stock, Number of Shares     0            
Stock-based compensation (2.7) 3.2 $ 0.0 $ 0.0 (2.7) 3.2 0.0 0.0 0.0
Stock-based compensation, Number of Shares     200,000 0          
Balance at Mar. 31, 2024 4,445.3 5,003.1 $ 2.0 $ 100.9 1,140.4 1,480.0 3,306.2 3,422.2 (3.3)
Common Stock, Shares, Outstanding at Mar. 31, 2024     200,500,000 40,400,000          
Balance at Dec. 31, 2024 4,640.9 5,326.4 $ 2.0 $ 100.9 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          
Changes in Stockholders' Equity                  
Net income 62.7 71.0 $ 0.0 $ 0.0 0.0 0.0 62.7 71.0 0.0
Net income, Number of Shares     0 0          
Other comprehensive income, net of tax 0.1 0.0 $ 0.0   0.0   0.0   0.1
Other comprehensive income, net of tax, Number of Shares     0            
Dividends declared on common stock (86.8)   $ 0.0   0.0   (86.8)   0.0
Dividends declared on common stock, Number of Shares     0            
Issuance of common stock $ 3.1   $ 0.0   3.1   0.0   0.0
Issuance of common stock, Number of Shares 234,476   100,000            
Stock-based compensation $ (4.3) 3.0 $ 0.0 $ 0.0 (4.3) 3.0 0.0 0.0 0.0
Stock-based compensation, Number of Shares     200,000 0          
Balance at Mar. 31, 2025 $ 4,615.7 $ 5,400.4 $ 2.0 $ 100.9 $ 1,164.7 $ 1,491.6 $ 3,451.6 $ 3,807.9 $ (2.6)
Common Stock, Shares, Outstanding at Mar. 31, 2025     201,300,000 40,400,000