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Stock-Based Compensation (Details) - USD ($)
$ / shares in Units, $ in Millions
 9 Months Ended 12 Months Ended
Sep. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of Shares Authorized   7,400,000    
Income tax benefit   $ 1.3 $ 1.2 $ 1.2
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]        
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]        
Total Compensation Cost Not yet Recognized   $ 4.0    
Total Shareholder Return [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value   $ 47.00 $ 36.86 $ 41.76
Expected Dividend Rate   4.00% 3.60% 3.80%
Expected Volatility Rate   17.00% 19.00% 19.80%
Risk Free Interest Rate   2.47% 2.38% 1.46%
Expected Term   2 years 10 months 9 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   227,679 261,423  
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted   68,396 [1] 91,940 85,501
Equity Instruments Other than Options, Converted in Period [2]   (95,593)    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period   (10,360)    
Equity Other Than Options, Employee Migration [3]   3,813    
Awards Other than Options, Fully Vested, Outstanding   77,799    
Equity Instruments Other than Options, Converted, Aggregrate Intrinsic Value   $ 7.0    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Outstanding   12.2    
Equity Instruments Other than Options, Fully Vested, 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, Beginning Balance 165,830 165,830    
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted   68,396 [1] 91,940 85,501
Equity Instruments Other than Options, Vested in Period   (77,799)    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period   (10,360)    
Equity Other Than Options, Employee Migration [3]   3,813    
Equity Instruments Other than Options, Nonvested, Ending Balance   149,880 165,830  
Awards Other than Options, Vested and Expected to Vest [4]   145,790    
Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value   $ 41.31 $ 39.17  
Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value   47.00 $ 36.86 $ 41.76
Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value   41.76    
Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value   41.33    
Equity Other Than Options, Employee Migration, Weighted Average Grant Date Fair Value   $ 41.43    
Equity Instruments Other than Options, Expected to Vest, Intrinsic Value $ 0.0      
Fair Value of Vested Performance Units and Restricted Stock   $ 3.2 $ 2.1 $ 2.3
Total Compensation Cost Not yet Recognized   $ 3.0    
Total Compensation Cost Not yet Recognized, Period for Recognition   1 year 8 months 4 days    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Nonvested   $ 8.1    
Performance Units Related to Earnings Per Share [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value   $ 0 $ 31.03 $ 34.83
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   53,977 87,143  
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted   0 30,649 28,499
Equity Instruments Other than Options, Converted in Period [2]   (31,865)    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period   (2,207)    
Equity Other Than Options, Employee Migration [5]   906    
Awards Other than Options, Fully Vested, Outstanding   25,931    
Equity Instruments Other than Options, Converted, Aggregrate Intrinsic Value   $ 2.5    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Outstanding   4.0    
Equity Instruments Other than Options, Fully Vested, Aggregrate Intrinsic Value   $ 2.3    
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, Beginning Balance 55,278 55,278    
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted   0 30,649 28,499
Equity Instruments Other than Options, Vested in Period   (25,931)    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period   (2,207)    
Equity Other Than Options, Employee Migration [5]   906    
Equity Instruments Other than Options, Nonvested, Ending Balance   28,046 55,278  
Awards Other than Options, Vested and Expected to Vest [4]   28,006    
Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value   $ 31.03 $ 32.82  
Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value   0 $ 31.03 $ 34.83
Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value   34.83    
Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value   32.02    
Equity Other Than Options, Employee Migration, Weighted Average Grant Date Fair Value   $ 32.84    
Equity Instruments Other than Options, Expected to Vest, Intrinsic Value $ 0.0      
Fair Value of Vested Performance Units and Restricted Stock   $ 0.9 $ 1.7 $ 0.4
Total Compensation Cost Not yet Recognized   $ 0.3    
Total Compensation Cost Not yet Recognized, Period for Recognition   1 year    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Nonvested   $ 1.7    
Performance Shares [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total compensation expense   4.5 4.6 3.0
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   3.3    
Restricted Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total compensation expense   $ 0.4 $ 0.0 0.0
Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value   $ 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   25,005 312  
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted   26,141    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period   (1,500)    
Equity Other Than Options, Employee Migration [5]   364    
Equity Instruments Other than Options, Vested in Period, Aggregate Intrinsic Value   $ 0.0    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Outstanding   $ 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, Beginning Balance 312 312    
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted   26,141    
Equity Instruments Other than Options, Vested in Period   (312)    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period   (1,500)    
Equity Other Than Options, Employee Migration [5]   364    
Equity Instruments Other than Options, Nonvested, Ending Balance   25,005 312  
Awards Other than Options, Vested and Expected to Vest [4]   20,251    
Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value   $ 41.62 $ 31.88  
Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value   41.63    
Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value   31.88    
Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value   41.78    
Equity Other Than Options, Employee Migration, Weighted Average Grant Date Fair Value   $ 41.78    
Fair Value of Vested Performance Units and Restricted Stock   $ 0.0 $ 0.0 0.1
Total Compensation Cost Not yet Recognized   $ 0.7    
Total Compensation Cost Not yet Recognized, Period for Recognition   2 years    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Nonvested   $ 0.9    
Stock Compensation Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total compensation expense   4.9 4.6 3.0
Performance Units Related to Earnings Per Share [Member] | Performance Shares [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total compensation expense   1.5 1.8 0.5
Total Shareholder Return [Member] | Performance Shares [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total compensation expense   $ 3.0 $ 2.8 $ 2.5
Common Stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures   164,794 8,599 965
[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, 2018 which were settled in February 2019.
[3] Due to certain employees transferring between OG&E and OGE Energy.
[4] The intrinsic value of the performance units based on total shareholder return and earnings per share is $8.1 million and $1.7 million, respectively. The intrinsic value of restricted stock units is $0.9 million.
[5] Due to certain employees transferring between OG&E and OGE Energy.