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CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (Unaudited) - USD ($)
shares in Millions, $ 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, 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     200.2 40.4            
Treasury Stock, Common, Shares at Dec. 31, 2022         0.0          
Changes in Stockholders' Equity                    
Net income 38.3 39.8 $ 0.0 $ 0.0 $ 0.0 0.0 0.0 38.3 39.8 0.0
Net income, Number of Shares     0.0 0.0 0.0          
Other comprehensive income, net of tax 1.1 0.0 $ 0.0   $ 0.0 0.0   0.0   1.1
Other comprehensive income, net of tax, Number of Shares     0.0   0.0          
Dividends declared on common stock (83.6)   $ 0.0   $ 0.0 0.0   (83.6)   0.0
Dividends declared on common stock, Number of Shares     0.0   0.0          
Stock-based compensation 0.8 0.6 $ 0.0 $ 0.0 $ 0.1 0.7 0.6 0.0 0.0 0.0
Stock-based compensation, Number of Shares     0.1 0.0 0.0          
Balance at Mar. 31, 2023 4,370.0 5,085.6 $ 2.0 $ 100.9 $ 0.0 1,133.2 1,474.3 3,245.6 3,510.4 (10.8)
Common Stock, Shares, Outstanding at Mar. 31, 2023     200.3 40.4            
Treasury Stock, Common, Shares at Mar. 31, 2023         0.0          
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     200.3 40.4            
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 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     0.0              
Dividends declared on common stock (86.1)   $ 0.0     0.0   (86.1)   0.0
Dividends declared on common stock, Number of Shares     0.0              
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     0.2 0.0            
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     200.5 40.4