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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]
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          
Changes in Stockholders' Equity                    
Net income 279.5 39.0 $ 0.0 $ 0.0 $ 0.0 0.0 0.0 279.5 39.0 0.0
Net income, Number of Shares     0 0 0          
Other comprehensive income, net of tax 7.8   $ 0.0   $ 0.0 0.0   0.0   7.8
Other comprehensive income, net of tax, Number of Shares     0   0          
Dividends declared on common stock (82.3)   $ 0.0   $ 0.0 0.0   (82.3)   0.0
Dividends declared on common stock, Number of Shares     0   0          
Stock-based compensation 1.4 0.8 $ 0.0 $ 0.0 $ 0.0 1.4 0.8 0.0 0.0 0.0
Stock-based compensation, Number of Shares     0 0 0          
Balance at Mar. 31, 2022 4,262.7 4,642.6 $ 2.0 $ 100.9 $ (0.1) 1,125.2 1,471.6 3,152.6 3,070.1 (17.0)
Common Stock, Shares, Outstanding at Mar. 31, 2022     200,100,000 40,400,000            
Treasury Stock, Common, Shares at Mar. 31, 2022         0          
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          
Changes in Stockholders' Equity                    
Net income 615.4 392.8           615.4    
Other comprehensive income, net of tax   0.0                
Balance at Sep. 30, 2022 4,440.7 4,997.9 $ 2.0 $ 100.9 $ (0.1) 1,129.7 1,473.1 3,323.5 3,423.9 (14.4)
Common Stock, Shares, Outstanding at Sep. 30, 2022     200.2 40,400,000            
Treasury Stock, Common, Shares at Sep. 30, 2022         0          
Balance at Mar. 31, 2022 4,262.7 4,642.6 $ 2.0 $ 100.9 $ (0.1) 1,125.2 1,471.6 3,152.6 3,070.1 (17.0)
Common Stock, Shares, Outstanding at Mar. 31, 2022     200,100,000 40,400,000            
Treasury Stock, Common, Shares at Mar. 31, 2022         0          
Changes in Stockholders' Equity                    
Net income 73.1 100.7 $ 0.0 $ 0.0 $ 0.0 0.0 0.0 73.1 100.7 0.0
Net income, Number of Shares     0 0 0          
Other comprehensive income, net of tax 0.9   $ 0.0   $ 0.0 0.0   0.0   0.9
Other comprehensive income, net of tax, Number of Shares     0   0          
Dividends declared on common stock (82.1)   $ 0.0   $ 0.0 0.0   (82.1)   0.0
Dividends declared on common stock, Number of Shares     0   0          
Stock-based compensation 2.3 0.7 $ 0.0 $ 0.0 $ 0.0 2.3 0.7 0.0 0.0 0.0
Stock-based compensation, Number of Shares     100,000 0 0          
Balance at Jun. 30, 2022 4,256.9 4,744.0 $ 2.0 $ 100.9 $ (0.1) 1,127.5 1,472.3 3,143.6 3,170.8 (16.1)
Common Stock, Shares, Outstanding at Jun. 30, 2022     200,200,000 40,400,000            
Treasury Stock, Common, Shares at Jun. 30, 2022         0          
Changes in Stockholders' Equity                    
Net income 262.8 253.1 $ 0.0 $ 0.0 $ 0.0 0.0 0.0 262.8 253.1 0.0
Net income, Number of Shares     0 0 0          
Other comprehensive income, net of tax 1.7 0.0 $ 0.0   $ 0.0 0.0   0.0   1.7
Other comprehensive income, net of tax, Number of Shares     0   0          
Dividends declared on common stock (82.9)   $ 0.0   $ 0.0 0.0   (82.9)   0.0
Dividends declared on common stock, Number of Shares     0   0          
Stock-based compensation 2.2 0.8 $ 0.0 $ 0.0 $ 0.0 2.2 0.8 0.0 0.0 0.0
Stock-based compensation, Number of Shares     0   0          
Balance at Sep. 30, 2022 4,440.7 4,997.9 $ 2.0 $ 100.9 $ (0.1) 1,129.7 1,473.1 3,323.5 3,423.9 (14.4)
Common Stock, Shares, Outstanding at Sep. 30, 2022     200.2 40,400,000            
Treasury Stock, Common, Shares at Sep. 30, 2022         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          
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          
Other comprehensive income, net of tax 1.1   $ 0.0   $ 0.0 0.0   0.0   1.1
Other comprehensive income, net of tax, Number of Shares     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          
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     100,000 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     200,300,000 40,400,000            
Treasury Stock, Common, Shares at Mar. 31, 2023         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          
Changes in Stockholders' Equity                    
Net income 368.6 377.8           368.6    
Other comprehensive income, net of tax   0.0                
Balance at Sep. 30, 2023 4,540.7 4,925.2 $ 2.0 $ 100.9 $ 0.0 1,139.6 1,475.9 3,409.2 3,348.4 (10.1)
Common Stock, Shares, Outstanding at Sep. 30, 2023     200.3 40,400,000            
Treasury Stock, Common, Shares at Sep. 30, 2023         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     200,300,000 40,400,000            
Treasury Stock, Common, Shares at Mar. 31, 2023         0          
Changes in Stockholders' Equity                    
Net income 88.4 91.9 $ 0.0 $ 0.0 $ 0.0 0.0 0.0 88.4 91.9 0.0
Net income, Number of Shares     0 0 0          
Other comprehensive income, net of tax 0.5   $ 0.0   $ 0.0 0.0   0.0   0.5
Other comprehensive income, net of tax, Number of Shares     0   0          
Dividends declared on common stock (83.0) (250.0) $ 0.0 $ 0.0 $ 0.0 0.0 0.0 (83.0) (250.0) 0.0
Dividends declared on common stock, Number of Shares     0 0 0          
Stock-based compensation 3.2 0.9 $ 0.0 $ 0.0 $ 0.0 3.2 0.9 0.0 0.0 0.0
Stock-based compensation, Number of Shares     0 0 0          
Balance at Jun. 30, 2023 4,379.1 4,928.4 $ 2.0 $ 100.9 $ 0.0 1,136.4 1,475.2 3,251.0 3,352.3 (10.3)
Common Stock, Shares, Outstanding at Jun. 30, 2023     200,300,000 40,400,000            
Treasury Stock, Common, Shares at Jun. 30, 2023         0          
Changes in Stockholders' Equity                    
Net income 241.9 246.1 $ 0.0 $ 0.0 $ 0.0 0.0 0.0 241.9 246.1 0.0
Net income, Number of Shares     0 0 0          
Other comprehensive income, net of tax 0.2 0.0 $ 0.0   $ 0.0 0.0   0.0   0.2
Other comprehensive income, net of tax, Number of Shares     0   0          
Dividends declared on common stock (83.7) (250.0) $ 0.0 $ 0.0 $ 0.0 0.0 0.0 (83.7) (250.0) 0.0
Dividends declared on common stock, Number of Shares     0 0 0          
Stock-based compensation 3.2 0.7 $ 0.0 $ 0.0 $ 0.0 3.2 0.7 0.0 0.0 0.0
Stock-based compensation, Number of Shares     0 0 0          
Balance at Sep. 30, 2023 $ 4,540.7 $ 4,925.2 $ 2.0 $ 100.9 $ 0.0 $ 1,139.6 $ 1,475.9 $ 3,409.2 $ 3,348.4 $ (10.1)
Common Stock, Shares, Outstanding at Sep. 30, 2023     200.3 40,400,000            
Treasury Stock, Common, Shares at Sep. 30, 2023         0