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Stock-Based Compensation - Share-based Compensation, Activity (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Equity Instruments Other than Options, Forfeited in Period (46,753)    
Total Shareholder Return [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted 275,499 213,442 216,437
Total Shareholder Return [Member] | Og and E [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted 275,499 65,069 60,923
Performance Units [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Outstanding, Number, Beginning Balance 652,118    
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted [1] 275,499    
Equity Instruments Other than Options, Converted in Period [2] (234,672)    
Equity Instruments Other than Options, Vested in Period (191,918)    
Equity Instruments Other than Options, Forfeited in Period (46,753)    
Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Outstanding, Number, Ending Balance 646,192 652,118  
Awards Other than Options, Fully Vested [3] 191,918    
Equity Instruments Other than Options, Converted, Aggregrate Intrinsic Value $ 12.7    
Equity Instruments Other than Options, Outstanding, Aggregrate Intrinsic Value 42.5    
Equity Instruments Other than Options, Aggregate Intrinsic Value, Vested $ 12.5    
Performance Units [Member] | Og and E [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Outstanding, Number, Beginning Balance 183,837    
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted [1] 275,499    
Equity Instruments Other than Options, Converted in Period [2] (234,672)    
Equity Instruments Other than Options, Vested in Period (191,918)    
Equity Instruments Other than Options, Forfeited in Period (46,753)    
Equity Other Than Options, Employee Migration [4] 468,281    
Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Outstanding, Number, Ending Balance 646,192 183,837  
Awards Other than Options, Fully Vested [3] 191,918    
Equity Instruments Other than Options, Converted, Aggregrate Intrinsic Value $ 12.7    
Equity Instruments Other than Options, Outstanding, Aggregrate Intrinsic Value 42.5    
Equity Instruments Other than Options, Aggregate Intrinsic Value, Vested $ 12.5    
Restricted Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Outstanding, Number, Beginning Balance 223,146    
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted 148,345 114,926 116,539
Equity Instruments Other than Options, Vested in Period (101,130)    
Equity Instruments Other than Options, Forfeited in Period (26,307)    
Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Outstanding, Number, Ending Balance 244,054 223,146  
Equity Instruments Other than Options, Vested, Aggregrate Intrinsic Value $ 4.2    
Equity Instruments Other than Options, Outstanding, Aggregrate Intrinsic Value $ 10.1    
Restricted Stock [Member] | Og and E [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Outstanding, Number, Beginning Balance 64,244    
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted 148,345 35,034 32,804
Equity Instruments Other than Options, Vested in Period (101,130)    
Equity Instruments Other than Options, Forfeited in Period (26,307)    
Equity Other Than Options, Employee Migration [4] 158,902    
Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Outstanding, Number, Ending Balance 244,054 64,244  
Equity Instruments Other than Options, Vested, Aggregrate Intrinsic Value $ 4.2    
Equity Instruments Other than Options, Outstanding, Aggregrate Intrinsic Value $ 10.1    
[1] For performance units, this represents the target number of performance units granted. Actual number of performance units earned, if any, is dependent upon performance and may range from zero percent to 200 percent of the target.
[2] These amounts represent performance units that vested at December 31, 2023, which were settled in February 2024.
[3] These amounts represent performance units that vested at December 31, 2024. Actual expected amounts to be paid out in 2025 will differ based on the percentage at which the performance metric was met and are dependent upon Compensation Committee approval.
[4] As a result of OGE Energy's exit of its former midstream business and becoming primarily an electric company, all employees are directly employed by OG&E beginning in 2024.