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Stock-Based Compensation (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of Shares Authorized 7,400,000    
Tax Benefit from Compensation Expense $ 0.9 $ 1.1 $ 1.1
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 $ 3.1    
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 $ 20.84 $ 31.02 $ 34.73
Expected Dividend Rate 3.50% 2.60% 2.50%
Expected Volatility Rate 19.80% 16.90% 20.00%
Risk Free Interest Rate 0.88% 0.91% 0.67%
Expected Term 2 years 10 months 6 days 2 years 10 months 6 days 2 years 10 months 17 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 236,581 214,652  
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted 105,076 [1] 90,098 67,773
Equity Instruments Other than Options, Converted in Period [2] (80,581)    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period (7,172)    
Equity Other Than Options, Employee Migration [3],[4] 4,606    
Awards Other than Options, Fully Vested, Outstanding 57,484    
Equity Instruments Other than Options, Converted, Aggregrate Intrinsic Value $ 0.0    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Outstanding 6.5    
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 134,071    
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted 105,076 [1] 90,098 67,773
Equity Instruments Other Than Options, Modification 0    
Equity Instruments Other than Options, Vested in Period (57,484)    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period (7,172)    
Equity Other Than Options, Employee Migration [3],[4] 4,606    
Equity Instruments Other than Options, Nonvested, Ending Balance 179,097 134,071  
Awards Other than Options, Vested and Expected to Vest [5] 167,588    
Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value $ 25.12 $ 32.62  
Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value 20.84 $ 31.02 $ 34.73
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Modifications in Period, Weighted Average Grant Date Fair Value 0.00    
Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value 34.73    
Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value 26.45    
Equity Other Than Options, Employee Migration, Weighted Average Grant Date Fair Value $ 26.67    
Equity Instruments Other than Options, Expected to Vest, Intrinsic Value   $ 0.0  
Fair Value of Vested Performance Units and Restricted Stock $ 2.0 $ 2.1 $ 1.9
Total Compensation Cost Not yet Recognized $ 2.2    
Total Compensation Cost Not yet Recognized, Period for Recognition 1 year 7 months 28 days    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Nonvested $ 5.8    
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 $ 26.59 $ 33.99 $ 34.74
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 78,864 71,555  
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted 35,025 [1] 30,034 22,592
Equity Instruments Other than Options, Converted in Period [2] (26,862)    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period (2,388)    
Equity Other Than Options, Employee Migration [3],[4] 1,534    
Awards Other than Options, Fully Vested, Outstanding 19,164    
Equity Instruments Other than Options, Converted, Aggregrate Intrinsic Value $ 0.0    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Outstanding 0.7    
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 44,693    
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted 35,025 [1] 30,034 22,592
Equity Instruments Other Than Options, Modification 0    
Equity Instruments Other than Options, Vested in Period (19,164)    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period (2,388)    
Equity Other Than Options, Employee Migration [3],[4] 1,534    
Equity Instruments Other than Options, Nonvested, Ending Balance 59,700 44,693  
Awards Other than Options, Vested and Expected to Vest [5] 55,863    
Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value $ 29.70 $ 34.22  
Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value 26.59 $ 33.99 $ 34.74
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Modifications in Period, Weighted Average Grant Date Fair Value 0.00    
Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value 34.74    
Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value 30.32    
Equity Other Than Options, Employee Migration, Weighted Average Grant Date Fair Value $ 30.34    
Equity Instruments Other than Options, Expected to Vest, Intrinsic Value   $ 0.0  
Fair Value of Vested Performance Units and Restricted Stock $ 0.0 0.0 $ 0.7
Total Compensation Cost Not yet Recognized $ 0.9    
Total Compensation Cost Not yet Recognized, Period for Recognition 1 year 8 months 12 days    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Nonvested $ 1.9    
Performance Shares [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation expense 2.2 2.8 2.8
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 3.1    
Restricted Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation expense $ 0.0 $ 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 $ 0.00 $ 35.66
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 1,796 5,715  
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted 0 0 6,204
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period (268)    
Equity Other Than Options, Employee Migration 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 5,715    
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted 0 0 6,204
Equity Instruments Other than Options, Vested in Period (3,651)    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period (268)    
Equity Other Than Options, Employee Migration 0    
Equity Instruments Other than Options, Nonvested, Ending Balance 1,796 5,715  
Awards Other than Options, Vested and Expected to Vest 1,796    
Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value $ 35.45 $ 34.04  
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 33.10    
Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value 37.31    
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 $ 0.0    
Total Compensation Cost Not yet Recognized, Period for Recognition 9 months 11 days    
Stock Compensation Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation expense $ 2.2 2.9 2.9
Performance Units Related to Earnings Per Share [Member] | Performance Shares [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation expense 0.1 0.4 0.8
Total Shareholder Return [Member] | Performance Shares [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation expense $ 2.1 $ 2.4 $ 2.0
Common Stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures 1,131 18,820 100,640
Restricted Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares Paid for Tax Withholding 658    
[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, 2015 which were settled in February 2016.
[3] Due to certain employees transferring between OG&E and its affiliates.
[4] Due to certain employees transferring between OG&E and its affiliates.
[5] The intrinsic value of the performance units based on total shareholder return and earnings per share is $5.8 million and $1.9 million respectively.