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Stock-Based Compensation (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of Shares Authorized 7,400,000    
Tax Benefit from Compensation Expense $ 1.1 $ 1.1 $ 0.9
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 $ 2.9    
Options, Exercises in Period, Total Intrinsic Value [1]     $ 0.2
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 $ 31.02 $ 34.73 $ 25.89
Expected Dividend Rate 2.60% 2.50% 2.80%
Expected Volatility Rate 16.90% 20.00% 20.00%
Risk Free Interest Rate 0.91% 0.67% 0.37%
Expected Term 2 years 10 months 6 days 2 years 10 months 17 days 2 years 10 months 2 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 214,652 212,280  
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted 90,098 [2] 67,773 71,850
Equity Instruments Other than Options, Converted in Period [3] (80,268)    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period (11,107)    
Equity Other Than Options, Employee Migration [4],[5] 3,649    
Awards Other than Options, Fully Vested, Outstanding 80,581    
Equity Instruments Other than Options, Converted, Aggregrate Intrinsic Value [3] $ 0.0    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Outstanding 0.0    
Equity Instruments Other than Options, Fully Vested, 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]      
Equity Instruments Other than Options, Nonvested, Beginning Balance 139,260    
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted 90,098 [2] 67,773 71,850
Equity Instruments Other Than Options, Modification [6] (7,248)    
Equity Instruments Other than Options, Vested in Period (80,581)    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period (11,107)    
Equity Other Than Options, Employee Migration [4],[5] 3,649    
Equity Instruments Other than Options, Nonvested, Ending Balance 134,071 139,260  
Awards Other than Options, Vested and Expected to Vest [7] 127,882    
Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value $ 32.62 $ 30.24  
Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value 31.02 $ 34.73 $ 25.89
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Modifications in Period, Weighted Average Grant Date Fair Value 28.95    
Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value 25.89    
Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value 31.95    
Equity Other Than Options, Employee Migration, Weighted Average Grant Date Fair Value $ 10.79    
Equity Instruments Other than Options, Expected to Vest, Intrinsic Value $ 0.0    
Fair Value of Vested Performance Units and Restricted Stock 2.1 $ 1.9 $ 1.6
Total Compensation Cost Not yet Recognized $ 2.1    
Total Compensation Cost Not yet Recognized, Period for Recognition 1 year 8 months 19 days    
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 $ 33.99 $ 34.74 $ 26.73
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 71,555 70,763  
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted 30,034 [2] 22,592 23,952
Equity Instruments Other than Options, Converted in Period [3] (26,755)    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period (3,704)    
Equity Other Than Options, Employee Migration [4],[5] 1,217    
Awards Other than Options, Fully Vested, Outstanding 26,862    
Equity Instruments Other than Options, Converted, Aggregrate Intrinsic Value [3] $ 1.1    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Outstanding 1.1    
Equity Instruments Other than Options, Fully Vested, 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]      
Equity Instruments Other than Options, Nonvested, Beginning Balance 46,424    
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted 30,034 [2] 22,592 23,952
Equity Instruments Other Than Options, Modification [6] (2,416)    
Equity Instruments Other than Options, Vested in Period (26,862)    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period (3,704)    
Equity Other Than Options, Employee Migration [4],[5] 1,217    
Equity Instruments Other than Options, Nonvested, Ending Balance 44,693 46,424  
Awards Other than Options, Vested and Expected to Vest [7] 42,631    
Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value $ 34.22 $ 30.67  
Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value 33.99 $ 34.74 $ 26.73
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Modifications in Period, Weighted Average Grant Date Fair Value 28.95    
Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value 26.73    
Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value 33.26    
Equity Other Than Options, Employee Migration, Weighted Average Grant Date Fair Value $ 9.33    
Equity Instruments Other than Options, Expected to Vest, Intrinsic Value $ 0.0    
Fair Value of Vested Performance Units and Restricted Stock 0.0 $ 0.7 $ 1.0
Total Compensation Cost Not yet Recognized $ 0.7    
Total Compensation Cost Not yet Recognized, Period for Recognition 1 year 8 months 27 days    
Performance Shares [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation expense $ 2.8 2.8 2.2
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 2.8    
Restricted Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation expense $ 0.1 $ 0.1 $ 0.1
Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value $ 0.00    
Options, Grants in Period, Weighted Average Grant Date Fair Value $ 0.00 $ 35.66 $ 29.71
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 5,715 9,198  
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted 0 6,204 3,824
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period 0    
Equity Other Than Options, Employee Migration [4] 0    
Equity Instruments Other than Options, Vested in Period, Aggregate Intrinsic Value $ 0.1    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Outstanding $ 0.1    
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 9,198    
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted 0 6,204 3,824
Equity Instruments Other than Options, Vested in Period (3,483)    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period 0    
Equity Other Than Options, Employee Migration [4] 0    
Equity Instruments Other than Options, Nonvested, Ending Balance 5,715 9,198  
Awards Other than Options, Vested and Expected to Vest 5,715    
Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value $ 34.04 $ 33.57  
Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value 0.00    
Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value 29.47    
Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value 0.00    
Equity Other Than Options, Employee Migration, Weighted Average Grant Date Fair Value $ 0.00    
Fair Value of Vested Performance Units and Restricted Stock $ 0.1 $ 0.1 $ 0.1
Total Compensation Cost Not yet Recognized $ 0.1    
Total Compensation Cost Not yet Recognized, Period for Recognition 1 year 7 months 24 days    
Stock Compensation Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation expense $ 2.9 2.9 2.3
Performance Units Related to Earnings Per Share [Member] | Performance Shares [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation expense 0.4 0.8 0.5
Total Shareholder Return [Member] | Performance Shares [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation expense $ 2.4 $ 2.0 $ 1.7
Common Stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures 18,820 100,640 139,706
Restricted Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares Paid for Tax Withholding 802    
[1] The difference between the market value on the date of exercise and the option exercise price.
[2] 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 0 percent to 200 percent of the target.
[3] These amounts represent performance units that vested at December 31, 2014 which were settled in February 2015.
[4] Due to certain employees transferring between OG&E and its affiliates.
[5] Due to certain employees transferring between OG&E and its affiliates.
[6] Units paid out under terms of plan to member on long-term disability.
[7] There is no intrinsic value of the performance units based on total shareholder return and earnings per share.