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Stock Based Compensation (Details) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Sep. 30, 2020
Mar. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of Shares Authorized     7,400,000    
Tax Benefit from Compensation Expense     $ 2.5 $ 2.5 $ 3.6
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted     154,523 247,252  
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]          
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted     154,523 247,252  
Minimum payout range     0.00%    
Maximum payout range     200.00%    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]          
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted     154,523 247,252  
Total Compensation Cost Not yet Recognized     $ 11.0    
Treasury Stock, Shares, Acquired     405,000    
Treasury Stock Acquired, Average Cost Per Share $ 33.14 $ 38.04      
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period         443,900
Og and E [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Tax Benefit from Compensation Expense     $ 0.6 $ 0.8 $ 1.3
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]          
Total Compensation Cost Not yet Recognized     $ 2.8    
Stock Issued During Period, Shares, New Issues     0 0 0
Performance Units Related to Earnings Per Share [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     0    
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]          
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number     0 79,002  
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted     0    
Equity Instruments Other than Options, Converted in Period [1]     (79,002)    
Equity Instruments Other than Options, Forfeited in Period     0    
Awards Other than Options, Fully Vested     0    
Equity Instruments Other than Options, Converted, Aggregrate Intrinsic Value     $ 2.7    
Equity Instruments Other than Options, Vested in Period, Aggregate Intrinsic Value     0.0    
Equity Instruments Other than Options, Outstanding, Aggregrate Intrinsic Value     $ 0.0    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]          
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted     0    
Equity Instruments Other than Options, Forfeited in Period     0    
Fair Value of Vested Performance Units and Restricted Stock     $ 0.0 $ 2.5 $ 5.2
Performance Units Related to Earnings Per Share [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     0    
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]          
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number     0 25,235  
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted     0    
Equity Instruments Other than Options, Converted in Period [1]     (25,235)    
Equity Instruments Other than Options, Forfeited in Period     0    
Equity Other Than Options, Employee Migration [2]     0    
Awards Other than Options, Fully Vested     0    
Equity Instruments Other than Options, Converted, Aggregrate Intrinsic Value     $ 0.8    
Equity Instruments Other than Options, Vested in Period, Aggregate Intrinsic Value     0.0    
Equity Instruments Other than Options, Outstanding, Aggregrate Intrinsic Value     $ 0.0    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]          
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted     0    
Equity Instruments Other than Options, Forfeited in Period     0    
Equity Other Than Options, Employee Migration [2]     0    
Fair Value of Vested Performance Units and Restricted Stock     $ 0.0 $ 0.8 $ 0.9
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     249,909 [3] 201,552 208,647
Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value     $ 38.14 $ 38.03 $ 47.00
Expected Dividend Rate     4.70% 3.50% 4.00%
Expected Volatility Rate     29.00% 15.00% 17.00%
Risk Free Interest Rate     0.22% 1.17% 2.47%
Expected Term     2 years 10 months 2 days 2 years 10 months 6 days 2 years 10 months 9 days
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]          
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number     581,252 612,262  
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted     249,909 [3] 201,552 208,647
Equity Instruments Other than Options, Converted in Period [1]     (236,990)    
Equity Instruments Other than Options, Forfeited in Period     (43,929)    
Awards Other than Options, Fully Vested     172,748    
Equity Instruments Other than Options, Converted, Aggregrate Intrinsic Value     $ 5.4    
Equity Instruments Other than Options, Vested in Period, Aggregate Intrinsic Value     0.0    
Equity Instruments Other than Options, Outstanding, Aggregrate Intrinsic Value     $ 17.5    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]          
Equity Instruments Other than Options, Nonvested, Number, Beginning Balance     375,272    
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted     249,909 [3] 201,552 208,647
Equity Instruments Other than Options, Vested in Period     (172,748)    
Equity Instruments Other than Options, Forfeited in Period     (43,929)    
Equity Instruments Other than Options, Nonvested, Number, Ending Balance     408,504 375,272  
Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value     $ 38.05 $ 42.51  
Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value     38.14 $ 38.03 $ 47.00
Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value     47.00    
Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value     $ 41.02    
Fair Value of Vested Performance Units and Restricted Stock     $ 8.1 $ 8.7 $ 9.3
Total Compensation Cost Not yet Recognized     $ 7.5    
Total Compensation Cost Not yet Recognized, Period for Recognition     1 year 8 months 15 days    
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     68,720 [4] 67,975 68,396
Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value     $ 38.14 $ 38.03 $ 47.00
Expected Dividend Rate     4.70% 3.50% 4.00%
Expected Volatility Rate     29.00% 15.00% 17.00%
Risk Free Interest Rate     0.22% 1.17% 2.47%
Expected Term     2 years 10 months 6 days 2 years 10 months 6 days 2 years 10 months 9 days
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]          
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number     161,310 182,363  
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted     68,720 [4] 67,975 68,396
Equity Instruments Other than Options, Converted in Period [1]     (75,693)    
Equity Instruments Other than Options, Forfeited in Period     (14,132)    
Equity Other Than Options, Employee Migration [5]     52    
Awards Other than Options, Fully Vested     48,195    
Equity Other Than Options, Employee Migration, Weighted Average Grant Date Fair Value     $ 41.01    
Equity Instruments Other than Options, Converted, Aggregrate Intrinsic Value     $ 1.7    
Equity Instruments Other than Options, Vested in Period, Aggregate Intrinsic Value     0.0    
Equity Instruments Other than Options, Outstanding, Aggregrate Intrinsic Value     $ 4.8    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]          
Equity Instruments Other than Options, Nonvested, Number, Beginning Balance     106,670    
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted     68,720 [4] 67,975 68,396
Equity Instruments Other than Options, Vested in Period     (48,195)    
Equity Instruments Other than Options, Forfeited in Period     (14,132)    
Equity Other Than Options, Employee Migration [5]     52    
Equity Instruments Other than Options, Nonvested, Number, Ending Balance     113,115 106,670  
Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value     $ 38.10 $ 42.49  
Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value     38.14 $ 38.03 $ 47.00
Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value     47.00    
Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value     $ 41.12    
Fair Value of Vested Performance Units and Restricted Stock     $ 2.3 $ 2.8 $ 3.2
Total Compensation Cost Not yet Recognized     $ 2.0    
Total Compensation Cost Not yet Recognized, Period for Recognition     1 year 8 months 19 days    
Performance Shares [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Compensation Expense     $ 7.5 8.9 13.0
Performance Shares [Member] | Og and E [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Compensation Expense     1.8 2.6 4.5
Restricted Stock [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Compensation Expense     $ 2.3 $ 0.9 $ 0.9
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted     89,197 67,193 75,929
Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value     $ 31.11 $ 43.69 $ 41.71
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]          
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number     133,671 124,919  
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted     89,197 67,193 75,929
Equity Instruments Other than Options, Forfeited in Period     (27,171)    
Awards Other than Options, Fully Vested     47,907    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value     $ (2.2)    
Equity Instruments Other than Options, Vested in Period, Aggregate Intrinsic Value     (2.0)    
Equity Instruments Other than Options, Outstanding, Aggregrate Intrinsic Value     $ 5.1    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]          
Equity Instruments Other than Options, Nonvested, Number, Beginning Balance     124,919    
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted     89,197 67,193 75,929
Equity Instruments Other than Options, Vested in Period     (53,274)    
Equity Instruments Other than Options, Forfeited in Period     (27,171)    
Equity Instruments Other than Options, Nonvested, Number, Ending Balance     133,671 124,919  
Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value     $ 35.64 $ 42.69  
Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value     31.11 $ 43.69 $ 41.71
Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value     41.59    
Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value     $ 42.37    
Fair Value of Vested Performance Units and Restricted Stock     $ 2.2 $ 0.1 $ 0.1
Total Compensation Cost Not yet Recognized     $ 3.5    
Total Compensation Cost Not yet Recognized, Period for Recognition     1 year 5 months 23 days    
Restricted Stock [Member] | Og and E [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Compensation Expense     $ 0.4 $ 0.4 $ 0.4
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted     22,911 22,665 26,141
Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value     $ 30.91 $ 43.69 $ 41.63
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]          
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number     35,613 34,130  
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted     22,911 22,665 26,141
Equity Instruments Other than Options, Forfeited in Period     (8,986)    
Equity Other Than Options, Employee Migration [5]     19    
Awards Other than Options, Fully Vested     11,241    
Equity Other Than Options, Employee Migration, Weighted Average Grant Date Fair Value     $ 37.71    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value     $ (0.6)    
Equity Instruments Other than Options, Vested in Period, Aggregate Intrinsic Value     (0.5)    
Equity Instruments Other than Options, Outstanding, Aggregrate Intrinsic Value     $ 1.4    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]          
Equity Instruments Other than Options, Nonvested, Number, Beginning Balance     34,130    
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted     22,911 22,665 26,141
Equity Instruments Other than Options, Vested in Period     (12,461)    
Equity Instruments Other than Options, Forfeited in Period     (8,986)    
Equity Other Than Options, Employee Migration [5]     19    
Equity Instruments Other than Options, Nonvested, Number, Ending Balance     35,613 34,130  
Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value     $ 35.52 $ 42.67  
Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value     30.91 $ 43.69 $ 41.63
Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value     45.67    
Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value     $ 42.51    
Fair Value of Vested Performance Units and Restricted Stock     $ 0.5 $ 0.1 $ 0.0
Total Compensation Cost Not yet Recognized     $ 0.8    
Total Compensation Cost Not yet Recognized, Period for Recognition     1 year 4 months 20 days    
Stock Compensation Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Compensation Expense     $ 9.8 9.8 13.9
Stock Compensation Plan [Member] | Og and E [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Compensation Expense     $ 2.2 $ 3.0 4.9
Restricted Stock Units (RSUs)          
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]          
Equity Instruments Other than Options, Converted in Period     0 0  
Performance Units Related to Earnings Per Share [Member] | Performance Shares [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Compensation Expense     $ 0.0 $ 1.0 4.3
Performance Units Related to Earnings Per Share [Member] | Performance Shares [Member] | Og and E [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Compensation Expense     0.0 0.3 1.5
Total Shareholder Return [Member] | Performance Shares [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Compensation Expense     7.5 7.9 8.7
Total Shareholder Return [Member] | Performance Shares [Member] | Og and E [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Compensation Expense     $ 1.8 $ 2.3 $ 3.0
[1] These amounts represent performance units that vested at December 31, 2020 which were settled in February 2021.
[2] Due to certain employees transferring between OG&E and OGE Energy.
[3] 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.
[4] 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.
[5] Due to certain employees transferring between OG&E and OGE Energy.