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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, 2020
Dec. 31, 2019
Dec. 31, 2018
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 $ 3.6 $ 3.4
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted     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     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     247,252    
Total Compensation Cost Not yet Recognized     $ 8.7    
Treasury Stock, Shares, Acquired     405,000    
Treasury Stock Acquired, Average Cost Per Share $ 33.14 $ 38.04      
Og and E [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Tax Benefit from Compensation Expense     $ 0.8 $ 1.3 $ 1.2
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     $ 2.2    
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   87,308
Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value     $ 0 $ 31.03  
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     79,002 155,171  
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted     0   87,308
Equity Instruments Other than Options, Converted in Period [1]     (74,053)    
Equity Instruments Other than Options, Forfeited in Period     (2,116)    
Awards Other than Options, Fully Vested     79,002    
Equity Instruments Other than Options, Converted, Aggregrate Intrinsic Value     $ 6.6    
Equity Instruments Other than Options, Vested in Period, Aggregate Intrinsic Value     (2.7)    
Equity Instruments Other than Options, Outstanding, Aggregrate Intrinsic Value     $ 2.7    
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     81,118    
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted     0   87,308
Equity Instruments Other than Options, Vested in Period     (79,002)    
Equity Instruments Other than Options, Forfeited in Period     (2,116)    
Equity Instruments Other than Options, Nonvested, Number, Ending Balance     0 81,118  
Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value     $ 0 $ 31.03  
Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value     0 $ 31.03  
Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value     31.03    
Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value     $ 31.03    
Fair Value of Vested Performance Units and Restricted Stock     $ 2.5 $ 5.2 $ 4.9
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   30,649
Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value     $ 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     25,235 53,977  
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted     0   30,649
Equity Instruments Other than Options, Converted in Period [1]     (25,931)    
Equity Instruments Other than Options, Forfeited in Period     (1,969)    
Equity Other Than Options, Employee Migration [2]     (842)    
Awards Other than Options, Fully Vested     25,235    
Equity Other Than Options, Employee Migration, Weighted Average Grant Date Fair Value     $ 31.03    
Equity Instruments Other than Options, Converted, Aggregrate Intrinsic Value     $ 2.3    
Equity Instruments Other than Options, Vested in Period, Aggregate Intrinsic Value     (0.8)    
Equity Instruments Other than Options, Outstanding, Aggregrate Intrinsic Value     $ 0.8    
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     28,046    
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted     0   30,649
Equity Instruments Other than Options, Vested in Period     (25,235)    
Equity Instruments Other than Options, Forfeited in Period     (1,969)    
Equity Other Than Options, Employee Migration [2]     (842)    
Equity Instruments Other than Options, Nonvested, Number, Ending Balance     0 28,046  
Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value     $ 0 $ 31.03  
Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value     0    
Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value     31.03    
Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value     $ 31.03    
Fair Value of Vested Performance Units and Restricted Stock     $ 0.8 $ 0.9 $ 1.7
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     201,552 [3] 208,647 261,916
Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value     $ 38.03 $ 47.00 $ 36.86
Expected Dividend Rate     3.50% 4.00% 3.60%
Expected Volatility Rate     15.00% 17.00% 19.00%
Risk Free Interest Rate     1.17% 2.47% 2.38%
Expected Term     2 years 10 months 6 days 2 years 10 months 9 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     612,262 664,817  
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted     201,552 [3] 208,647 261,916
Equity Instruments Other than Options, Converted in Period [1]     (222,163)    
Equity Instruments Other than Options, Forfeited in Period     (31,944)    
Awards Other than Options, Fully Vested     236,990    
Equity Instruments Other than Options, Converted, Aggregrate Intrinsic Value     $ 11.5    
Equity Instruments Other than Options, Vested in Period, Aggregate Intrinsic Value     (5.4)    
Equity Instruments Other than Options, Outstanding, Aggregrate Intrinsic Value     $ 5.4    
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     442,654    
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted     201,552 [3] 208,647 261,916
Equity Instruments Other than Options, Vested in Period     (236,990)    
Equity Instruments Other than Options, Forfeited in Period     (31,944)    
Equity Instruments Other than Options, Nonvested, Number, Ending Balance     375,272 442,654  
Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value     $ 42.51 $ 41.43  
Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value     38.03 $ 47.00 $ 36.86
Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value     36.86    
Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value     $ 41.15    
Fair Value of Vested Performance Units and Restricted Stock     $ 8.7 $ 9.3 $ 5.9
Total Compensation Cost Not yet Recognized     $ 7.1    
Total Compensation Cost Not yet Recognized, Period for Recognition     1 year 7 months 13 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     67,975 [4] 68,396 91,940
Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value     $ 38.03 $ 47.00 $ 36.86
Expected Dividend Rate     3.50% 4.00% 3.60%
Expected Volatility Rate     15.00% 17.00% 19.00%
Risk Free Interest Rate     1.17% 2.47% 2.38%
Expected Term     2 years 10 months 6 days 2 years 10 months 9 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     182,363 227,679  
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted     67,975 [4] 68,396 91,940
Equity Instruments Other than Options, Converted in Period [1]     (77,799)    
Equity Instruments Other than Options, Forfeited in Period     (28,985)    
Equity Other Than Options, Employee Migration [5]     (6,507)    
Awards Other than Options, Fully Vested     75,693    
Equity Other Than Options, Employee Migration, Weighted Average Grant Date Fair Value     $ 40.26    
Equity Instruments Other than Options, Converted, Aggregrate Intrinsic Value     $ 4.0    
Equity Instruments Other than Options, Vested in Period, Aggregate Intrinsic Value     (1.7)    
Equity Instruments Other than Options, Outstanding, Aggregrate Intrinsic Value     $ 1.7    
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     149,880    
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted     67,975 [4] 68,396 91,940
Equity Instruments Other than Options, Vested in Period     (75,693)    
Equity Instruments Other than Options, Forfeited in Period     (28,985)    
Equity Other Than Options, Employee Migration [5]     (6,507)    
Equity Instruments Other than Options, Nonvested, Number, Ending Balance     106,670 149,880  
Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value     $ 42.49 $ 41.31  
Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value     38.03 $ 47.00 $ 36.86
Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value     36.86    
Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value     $ 41.12    
Fair Value of Vested Performance Units and Restricted Stock     $ 2.8 $ 3.2 $ 2.1
Total Compensation Cost Not yet Recognized     $ 1.8    
Total Compensation Cost Not yet Recognized, Period for Recognition     1 year 7 months 20 days    
Performance Shares [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Compensation Expense     $ 8.9 13.0 13.3
Performance Shares [Member] | Og and E [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Compensation Expense     2.6 4.5 4.6
Restricted Stock [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Compensation Expense     $ 0.9 $ 0.9 $ 0.1
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted     67,193 75,929 826
Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value     $ 43.69 $ 41.71 $ 36.28
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     124,919 72,880  
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted     67,193 75,929 826
Equity Instruments Other than Options, Forfeited in Period     (12,546)    
Awards Other than Options, Fully Vested     1,752    
Equity Instruments Other than Options, Vested in Period, Aggregate Intrinsic Value     $ (0.1)    
Equity Instruments Other than Options, Outstanding, Aggregrate Intrinsic Value     $ 4.0    
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     72,880    
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted     67,193 75,929 826
Equity Instruments Other than Options, Vested in Period     (2,608)    
Equity Instruments Other than Options, Forfeited in Period     (12,546)    
Equity Instruments Other than Options, Nonvested, Number, Ending Balance     124,919 72,880  
Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value     $ 42.69 $ 41.66  
Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value     43.69 $ 41.71 $ 36.28
Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value     40.30    
Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value     $ 42.60    
Fair Value of Vested Performance Units and Restricted Stock     $ 0.1 $ 0.1 $ 0.1
Total Compensation Cost Not yet Recognized     $ 1.6    
Total Compensation Cost Not yet Recognized, Period for Recognition     1 year 7 months 24 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 $ 0.0
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted     22,665 26,141 0
Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value     $ 43.69 $ 41.63 $ 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     34,130 25,005  
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted     22,665 26,141 0
Equity Instruments Other than Options, Forfeited in Period     (11,100)    
Equity Other Than Options, Employee Migration [2]     (1,327)    
Awards Other than Options, Fully Vested     1,114    
Equity Other Than Options, Employee Migration, Weighted Average Grant Date Fair Value     $ 42.76    
Equity Instruments Other than Options, Vested in Period, Aggregate Intrinsic Value     $ 0.0    
Equity Instruments Other than Options, Outstanding, Aggregrate Intrinsic Value     $ 1.1    
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     25,005    
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted     22,665 26,141 0
Equity Instruments Other than Options, Vested in Period     (1,113)    
Equity Instruments Other than Options, Forfeited in Period     (11,100)    
Equity Other Than Options, Employee Migration [2]     (1,327)    
Equity Instruments Other than Options, Nonvested, Number, Ending Balance     34,130 25,005  
Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value     $ 42.67 $ 41.62  
Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value     43.69 $ 41.63 $ 0
Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value     40.59    
Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value     $ 42.60    
Fair Value of Vested Performance Units and Restricted Stock     $ 0.1 $ 0.0 $ 0.0
Total Compensation Cost Not yet Recognized     $ 0.4    
Total Compensation Cost Not yet Recognized, Period for Recognition     1 year 8 months 4 days    
Stock Compensation Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Compensation Expense     $ 9.8 13.9 13.4
Stock Compensation Plan [Member] | Og and E [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Compensation Expense     3.0 4.9 4.6
Performance Units Related to Earnings Per Share [Member] | Performance Shares [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Compensation Expense     1.0 4.3 5.1
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     0.3 1.5 1.8
Total Shareholder Return [Member] | Performance Shares [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Compensation Expense     7.9 8.7 8.2
Total Shareholder Return [Member] | Performance Shares [Member] | Og and E [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Compensation Expense     $ 2.3 $ 3.0 $ 2.8
[1] These amounts represent performance units that vested at December 31, 2019 which were settled in March 2020.
[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.