XML 45 R62.htm IDEA: XBRL DOCUMENT v2.4.1.9
Stock Based Compensation (Details) (USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended 8 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of Shares Authorized 7,400,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized      
Tax Benefit from Compensation Expense $ 3.3us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense $ 3.1us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense $ 4.9us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense  
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]        
Minimum payout range 0.00%oge_MinimumPayoutRange      
Maximum payout range 200.00%oge_MaximumPayoutRange      
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 9.4us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized      
Options, Exercises in Period, Total Intrinsic Value   1.4us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue [1] 2.0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue [1]  
Cash Received from Exercise of Stock Options   0.4us-gaap_EmployeeServiceShareBasedCompensationCashReceivedFromExerciseOfStockOptions 0.8us-gaap_EmployeeServiceShareBasedCompensationCashReceivedFromExerciseOfStockOptions  
2013 Performance Units Grants [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       91,390us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted
/ us-gaap_AwardTypeAxis
= oge_A2013PerformanceUnitsGrantsMember
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       91,390us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted
/ us-gaap_AwardTypeAxis
= oge_A2013PerformanceUnitsGrantsMember
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       91,390us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted
/ us-gaap_AwardTypeAxis
= oge_A2013PerformanceUnitsGrantsMember
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 73,037us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted
/ us-gaap_AwardTypeAxis
= oge_PerformanceUnitsRelatedToEarningsPerShareMember
[2] 74,570us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted
/ us-gaap_AwardTypeAxis
= oge_PerformanceUnitsRelatedToEarningsPerShareMember
81,594us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted
/ us-gaap_AwardTypeAxis
= oge_PerformanceUnitsRelatedToEarningsPerShareMember
 
Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value $ 34.81us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= oge_PerformanceUnitsRelatedToEarningsPerShareMember
$ 26.73us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= oge_PerformanceUnitsRelatedToEarningsPerShareMember
$ 23.82us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= oge_PerformanceUnitsRelatedToEarningsPerShareMember
 
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 297,687us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber
/ us-gaap_AwardTypeAxis
= oge_PerformanceUnitsRelatedToEarningsPerShareMember
354,026us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber
/ us-gaap_AwardTypeAxis
= oge_PerformanceUnitsRelatedToEarningsPerShareMember
  354,026us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber
/ us-gaap_AwardTypeAxis
= oge_PerformanceUnitsRelatedToEarningsPerShareMember
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted 73,037us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted
/ us-gaap_AwardTypeAxis
= oge_PerformanceUnitsRelatedToEarningsPerShareMember
[2] 74,570us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted
/ us-gaap_AwardTypeAxis
= oge_PerformanceUnitsRelatedToEarningsPerShareMember
81,594us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted
/ us-gaap_AwardTypeAxis
= oge_PerformanceUnitsRelatedToEarningsPerShareMember
 
Equity Instruments Other than Options, Converted in Period (118,350)oge_EquityInstrumentsOtherThanOptionsConvertedInPeriod
/ us-gaap_AwardTypeAxis
= oge_PerformanceUnitsRelatedToEarningsPerShareMember
     
Equity Instruments Other than Options, Vested in Period (111,950)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= oge_PerformanceUnitsRelatedToEarningsPerShareMember
     
Equity Instruments Other than Options, Forfeited in Period (11,026)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
/ us-gaap_AwardTypeAxis
= oge_PerformanceUnitsRelatedToEarningsPerShareMember
     
Awards Other than Options, Fully Vested 111,950oge_AwardsOtherThanOptionsFullyVested
/ us-gaap_AwardTypeAxis
= oge_PerformanceUnitsRelatedToEarningsPerShareMember
     
Equity Instruments Other than Options, Converted, Aggregrate Intrinsic Value 8.0oge_EquityInstrumentsOtherThanOptionsConvertedAggregrateIntrinsicValue
/ us-gaap_AwardTypeAxis
= oge_PerformanceUnitsRelatedToEarningsPerShareMember
[3]      
Equity Instruments Other than Options, Outstanding, Aggregrate Intrinsic Value 8.0us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueOutstanding
/ us-gaap_AwardTypeAxis
= oge_PerformanceUnitsRelatedToEarningsPerShareMember
     
Equity Instruments Other than Options, Fully Vested, Aggregrate Intrinsic Value 4.8oge_EquityInstrumentsOtherThanOptionsFullyVestedAggregrateIntrinsicValue
/ us-gaap_AwardTypeAxis
= oge_PerformanceUnitsRelatedToEarningsPerShareMember
     
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 235,676us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= oge_PerformanceUnitsRelatedToEarningsPerShareMember
     
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted 73,037us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted
/ us-gaap_AwardTypeAxis
= oge_PerformanceUnitsRelatedToEarningsPerShareMember
[2] 74,570us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted
/ us-gaap_AwardTypeAxis
= oge_PerformanceUnitsRelatedToEarningsPerShareMember
81,594us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted
/ us-gaap_AwardTypeAxis
= oge_PerformanceUnitsRelatedToEarningsPerShareMember
 
Equity Instruments Other than Options, Vested in Period (111,950)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= oge_PerformanceUnitsRelatedToEarningsPerShareMember
     
Equity Instruments Other than Options, Forfeited in Period (11,026)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
/ us-gaap_AwardTypeAxis
= oge_PerformanceUnitsRelatedToEarningsPerShareMember
     
Equity Instruments Other than Options, Nonvested, Number, Ending Balance 185,737us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= oge_PerformanceUnitsRelatedToEarningsPerShareMember
235,676us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= oge_PerformanceUnitsRelatedToEarningsPerShareMember
  235,676us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= oge_PerformanceUnitsRelatedToEarningsPerShareMember
Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value $ 29.90us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= oge_PerformanceUnitsRelatedToEarningsPerShareMember
$ 25.28us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= oge_PerformanceUnitsRelatedToEarningsPerShareMember
  25.28us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= oge_PerformanceUnitsRelatedToEarningsPerShareMember
Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value $ 34.81us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= oge_PerformanceUnitsRelatedToEarningsPerShareMember
$ 26.73us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= oge_PerformanceUnitsRelatedToEarningsPerShareMember
$ 23.82us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= oge_PerformanceUnitsRelatedToEarningsPerShareMember
 
Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value $ 27.93us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= oge_PerformanceUnitsRelatedToEarningsPerShareMember
     
Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value $ 26.85us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= oge_PerformanceUnitsRelatedToEarningsPerShareMember
     
Awards Other than Options, Vested and Expected to Vest, Outstanding 167,807oge_AwardsOtherThanOptionsVestedAndExpectedToVest
/ us-gaap_AwardTypeAxis
= oge_PerformanceUnitsRelatedToEarningsPerShareMember
[4]      
Equity Instruments Other than Options, Expected to Vest, Intrinsic Value 6.2oge_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsExpectedtoVestIntrinsicValue
/ us-gaap_AwardTypeAxis
= oge_PerformanceUnitsRelatedToEarningsPerShareMember
     
Fair Value of Vested Performance Units and Restricted Stock 3.8oge_FairValueOfVestedPerformanceUnitsAndRestrictedStock
/ us-gaap_AwardTypeAxis
= oge_PerformanceUnitsRelatedToEarningsPerShareMember
4.9oge_FairValueOfVestedPerformanceUnitsAndRestrictedStock
/ us-gaap_AwardTypeAxis
= oge_PerformanceUnitsRelatedToEarningsPerShareMember
4.1oge_FairValueOfVestedPerformanceUnitsAndRestrictedStock
/ us-gaap_AwardTypeAxis
= oge_PerformanceUnitsRelatedToEarningsPerShareMember
 
Total Compensation Cost Not yet Recognized 2.0us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= oge_PerformanceUnitsRelatedToEarningsPerShareMember
     
Total Compensation Cost Not yet Recognized, Period for Recognition 1 year 9 months 4 days      
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 219,106us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted
/ us-gaap_AwardTypeAxis
= oge_TotalShareholderReturnMember
[2] 316,162us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted
/ us-gaap_AwardTypeAxis
= oge_TotalShareholderReturnMember
338,678us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted
/ us-gaap_AwardTypeAxis
= oge_TotalShareholderReturnMember
 
Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value $ 34.80us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= oge_TotalShareholderReturnMember
$ 25.89us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= oge_TotalShareholderReturnMember
$ 25.91us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= oge_TotalShareholderReturnMember
 
Expected Dividend Rate 2.50%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate
/ us-gaap_AwardTypeAxis
= oge_TotalShareholderReturnMember
2.80%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate
/ us-gaap_AwardTypeAxis
= oge_TotalShareholderReturnMember
3.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate
/ us-gaap_AwardTypeAxis
= oge_TotalShareholderReturnMember
 
Expected Volatility Rate 20.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
/ us-gaap_AwardTypeAxis
= oge_TotalShareholderReturnMember
20.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
/ us-gaap_AwardTypeAxis
= oge_TotalShareholderReturnMember
22.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
/ us-gaap_AwardTypeAxis
= oge_TotalShareholderReturnMember
 
Risk Free Interest Rate 0.67%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
/ us-gaap_AwardTypeAxis
= oge_TotalShareholderReturnMember
0.37%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
/ us-gaap_AwardTypeAxis
= oge_TotalShareholderReturnMember
0.38%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
/ us-gaap_AwardTypeAxis
= oge_TotalShareholderReturnMember
 
Expected Term 2 years 10 months 10 days 2 years 10 months 2 days 2 years 10 months 13 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 892,991us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber
/ us-gaap_AwardTypeAxis
= oge_TotalShareholderReturnMember
1,062,060us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber
/ us-gaap_AwardTypeAxis
= oge_TotalShareholderReturnMember
  1,062,060us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber
/ us-gaap_AwardTypeAxis
= oge_TotalShareholderReturnMember
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted 219,106us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted
/ us-gaap_AwardTypeAxis
= oge_TotalShareholderReturnMember
[2] 316,162us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted
/ us-gaap_AwardTypeAxis
= oge_TotalShareholderReturnMember
338,678us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted
/ us-gaap_AwardTypeAxis
= oge_TotalShareholderReturnMember
 
Equity Instruments Other than Options, Converted in Period (355,078)oge_EquityInstrumentsOtherThanOptionsConvertedInPeriod
/ us-gaap_AwardTypeAxis
= oge_TotalShareholderReturnMember
     
Equity Instruments Other than Options, Vested in Period (336,147)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= oge_TotalShareholderReturnMember
     
Equity Instruments Other than Options, Forfeited in Period (33,097)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
/ us-gaap_AwardTypeAxis
= oge_TotalShareholderReturnMember
     
Awards Other than Options, Fully Vested 336,147oge_AwardsOtherThanOptionsFullyVested
/ us-gaap_AwardTypeAxis
= oge_TotalShareholderReturnMember
     
Equity Instruments Other than Options, Converted, Aggregrate Intrinsic Value 19.3oge_EquityInstrumentsOtherThanOptionsConvertedAggregrateIntrinsicValue
/ us-gaap_AwardTypeAxis
= oge_TotalShareholderReturnMember
[3]      
Equity Instruments Other than Options, Outstanding, Aggregrate Intrinsic Value 0us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueOutstanding
/ us-gaap_AwardTypeAxis
= oge_TotalShareholderReturnMember
     
Equity Instruments Other than Options, Fully Vested, Aggregrate Intrinsic Value 0oge_EquityInstrumentsOtherThanOptionsFullyVestedAggregrateIntrinsicValue
/ us-gaap_AwardTypeAxis
= oge_TotalShareholderReturnMember
     
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 706,982us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= oge_TotalShareholderReturnMember
     
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted 219,106us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted
/ us-gaap_AwardTypeAxis
= oge_TotalShareholderReturnMember
[2] 316,162us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted
/ us-gaap_AwardTypeAxis
= oge_TotalShareholderReturnMember
338,678us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted
/ us-gaap_AwardTypeAxis
= oge_TotalShareholderReturnMember
 
Equity Instruments Other than Options, Vested in Period (336,147)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= oge_TotalShareholderReturnMember
     
Equity Instruments Other than Options, Forfeited in Period (33,097)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
/ us-gaap_AwardTypeAxis
= oge_TotalShareholderReturnMember
     
Equity Instruments Other than Options, Nonvested, Number, Ending Balance 556,844us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= oge_TotalShareholderReturnMember
706,982us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= oge_TotalShareholderReturnMember
  706,982us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= oge_TotalShareholderReturnMember
Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value $ 29.38us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= oge_TotalShareholderReturnMember
$ 25.90us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= oge_TotalShareholderReturnMember
  25.90us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= oge_TotalShareholderReturnMember
Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value $ 34.80us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= oge_TotalShareholderReturnMember
$ 25.89us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= oge_TotalShareholderReturnMember
$ 25.91us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= oge_TotalShareholderReturnMember
 
Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value $ 28.61us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= oge_TotalShareholderReturnMember
     
Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value $ 27.02us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= oge_TotalShareholderReturnMember
     
Awards Other than Options, Vested and Expected to Vest, Outstanding 503,991oge_AwardsOtherThanOptionsVestedAndExpectedToVest
/ us-gaap_AwardTypeAxis
= oge_TotalShareholderReturnMember
[4]      
Equity Instruments Other than Options, Expected to Vest, Intrinsic Value 0oge_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsExpectedtoVestIntrinsicValue
/ us-gaap_AwardTypeAxis
= oge_TotalShareholderReturnMember
     
Fair Value of Vested Performance Units and Restricted Stock 9.5oge_FairValueOfVestedPerformanceUnitsAndRestrictedStock
/ us-gaap_AwardTypeAxis
= oge_TotalShareholderReturnMember
8.2oge_FairValueOfVestedPerformanceUnitsAndRestrictedStock
/ us-gaap_AwardTypeAxis
= oge_TotalShareholderReturnMember
7.4oge_FairValueOfVestedPerformanceUnitsAndRestrictedStock
/ us-gaap_AwardTypeAxis
= oge_TotalShareholderReturnMember
 
Total Compensation Cost Not yet Recognized 7.2us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= oge_TotalShareholderReturnMember
     
Total Compensation Cost Not yet Recognized, Period for Recognition 1 year 7 months 17 days      
Performance Shares [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation Expense 12.0us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
10.7us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
12.2us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
 
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 9.2us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
     
Restricted Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation Expense 0us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
0.4us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
0.6us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
 
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted 7,037us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
5,940us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
10,824us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
 
Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value $ 35.71us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
$ 29.71us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
$ 26.72us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
 
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 12,501us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
23,628us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
  23,628us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted 7,037us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
5,940us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
10,824us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
 
Equity Instruments Other than Options, Vested in Period (7,876)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
     
Equity Instruments Other than Options, Forfeited in Period (10,288)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
     
Equity Instruments Other than Options, Vested in Period, Aggregate Intrinsic Value 0.3us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueVested
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
     
Equity Instruments Other than Options, Outstanding, Aggregrate Intrinsic Value 0.4us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueOutstanding
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
     
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 23,628us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
     
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted 7,037us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
5,940us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
10,824us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
 
Equity Instruments Other than Options, Vested in Period (7,876)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
     
Equity Instruments Other than Options, Forfeited in Period (10,288)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
     
Equity Instruments Other than Options, Nonvested, Number, Ending Balance 12,501us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
23,628us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
  23,628us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value $ 32.65us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
$ 26.30us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
  26.30us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value $ 35.71us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
$ 29.71us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
$ 26.72us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
 
Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value $ 26.82us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
     
Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value $ 24.65us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
     
Awards Other than Options, Vested and Expected to Vest, Outstanding 12,501oge_AwardsOtherThanOptionsVestedAndExpectedToVest
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
     
Fair Value of Vested Performance Units and Restricted Stock 0.2oge_FairValueOfVestedPerformanceUnitsAndRestrictedStock
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
0.7oge_FairValueOfVestedPerformanceUnitsAndRestrictedStock
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
0.7oge_FairValueOfVestedPerformanceUnitsAndRestrictedStock
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
 
Total Compensation Cost Not yet Recognized 0.2us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
     
Total Compensation Cost Not yet Recognized, Period for Recognition 2 years 5 months 19 days      
Stock Compensation Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation Expense 12.0us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_StockCompensationPlanMember
11.1us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_StockCompensationPlanMember
12.8us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_StockCompensationPlanMember
 
Amount paid by unconsolidated affiliates 3.6oge_AmountAttributabletoUnconsolidatedAffiliates
/ us-gaap_AwardTypeAxis
= us-gaap_StockCompensationPlanMember
3.1oge_AmountAttributabletoUnconsolidatedAffiliates
/ us-gaap_AwardTypeAxis
= us-gaap_StockCompensationPlanMember
0oge_AmountAttributabletoUnconsolidatedAffiliates
/ us-gaap_AwardTypeAxis
= us-gaap_StockCompensationPlanMember
 
Compensation Expense, Net of Unconsolidated Affiliates 8.4oge_AllocatedShareBasedCompensationExpenseNetOfUnconsolidatedAffiliates
/ us-gaap_AwardTypeAxis
= us-gaap_StockCompensationPlanMember
8.0oge_AllocatedShareBasedCompensationExpenseNetOfUnconsolidatedAffiliates
/ us-gaap_AwardTypeAxis
= us-gaap_StockCompensationPlanMember
12.8oge_AllocatedShareBasedCompensationExpenseNetOfUnconsolidatedAffiliates
/ us-gaap_AwardTypeAxis
= us-gaap_StockCompensationPlanMember
 
2012 Performance Unit Grants [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       82,930us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted
/ us-gaap_AwardTypeAxis
= oge_A2012PerformanceUnitGrantsMember
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       82,930us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted
/ us-gaap_AwardTypeAxis
= oge_A2012PerformanceUnitGrantsMember
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       82,930us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted
/ us-gaap_AwardTypeAxis
= oge_A2012PerformanceUnitGrantsMember
Performance Units Related to Earnings Per Share [Member] | 2013 Performance Units Grants [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       45,794us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted
/ us-gaap_AwardTypeAxis
= oge_A2013PerformanceUnitsGrantsMember
/ us-gaap_PlanNameAxis
= oge_PerformanceUnitsRelatedToEarningsPerShareMember
Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value       26.73us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= oge_A2013PerformanceUnitsGrantsMember
/ us-gaap_PlanNameAxis
= oge_PerformanceUnitsRelatedToEarningsPerShareMember
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       45,794us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted
/ us-gaap_AwardTypeAxis
= oge_A2013PerformanceUnitsGrantsMember
/ us-gaap_PlanNameAxis
= oge_PerformanceUnitsRelatedToEarningsPerShareMember
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       45,794us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted
/ us-gaap_AwardTypeAxis
= oge_A2013PerformanceUnitsGrantsMember
/ us-gaap_PlanNameAxis
= oge_PerformanceUnitsRelatedToEarningsPerShareMember
Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value       26.73us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= oge_A2013PerformanceUnitsGrantsMember
/ us-gaap_PlanNameAxis
= oge_PerformanceUnitsRelatedToEarningsPerShareMember
Performance Units Related to Earnings Per Share [Member] | Performance Shares [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation Expense 3.7us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_PlanNameAxis
= oge_PerformanceUnitsRelatedToEarningsPerShareMember
2.3us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_PlanNameAxis
= oge_PerformanceUnitsRelatedToEarningsPerShareMember
4.2us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_PlanNameAxis
= oge_PerformanceUnitsRelatedToEarningsPerShareMember
 
Performance Units Related to Earnings Per Share [Member] | 2012 Performance Unit Grants [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       41,376us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted
/ us-gaap_AwardTypeAxis
= oge_A2012PerformanceUnitGrantsMember
/ us-gaap_PlanNameAxis
= oge_PerformanceUnitsRelatedToEarningsPerShareMember
Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value       34.94us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= oge_A2012PerformanceUnitGrantsMember
/ us-gaap_PlanNameAxis
= oge_PerformanceUnitsRelatedToEarningsPerShareMember
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       41,376us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted
/ us-gaap_AwardTypeAxis
= oge_A2012PerformanceUnitGrantsMember
/ us-gaap_PlanNameAxis
= oge_PerformanceUnitsRelatedToEarningsPerShareMember
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       41,376us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted
/ us-gaap_AwardTypeAxis
= oge_A2012PerformanceUnitGrantsMember
/ us-gaap_PlanNameAxis
= oge_PerformanceUnitsRelatedToEarningsPerShareMember
Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value       34.94us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= oge_A2012PerformanceUnitGrantsMember
/ us-gaap_PlanNameAxis
= oge_PerformanceUnitsRelatedToEarningsPerShareMember
Total Shareholder Return [Member] | 2013 Performance Units Grants [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       45,596us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted
/ us-gaap_AwardTypeAxis
= oge_A2013PerformanceUnitsGrantsMember
/ us-gaap_PlanNameAxis
= oge_TotalShareholderReturnMember
Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value       25.89us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= oge_A2013PerformanceUnitsGrantsMember
/ us-gaap_PlanNameAxis
= oge_TotalShareholderReturnMember
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       45,596us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted
/ us-gaap_AwardTypeAxis
= oge_A2013PerformanceUnitsGrantsMember
/ us-gaap_PlanNameAxis
= oge_TotalShareholderReturnMember
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       45,596us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted
/ us-gaap_AwardTypeAxis
= oge_A2013PerformanceUnitsGrantsMember
/ us-gaap_PlanNameAxis
= oge_TotalShareholderReturnMember
Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value       25.89us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= oge_A2013PerformanceUnitsGrantsMember
/ us-gaap_PlanNameAxis
= oge_TotalShareholderReturnMember
Total Shareholder Return [Member] | Performance Shares [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation Expense $ 8.3us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_PlanNameAxis
= oge_TotalShareholderReturnMember
$ 8.4us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_PlanNameAxis
= oge_TotalShareholderReturnMember
$ 8.0us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_PlanNameAxis
= oge_TotalShareholderReturnMember
 
Total Shareholder Return [Member] | 2012 Performance Unit Grants [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       41,554us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted
/ us-gaap_AwardTypeAxis
= oge_A2012PerformanceUnitGrantsMember
/ us-gaap_PlanNameAxis
= oge_TotalShareholderReturnMember
Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value       47.71us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= oge_A2012PerformanceUnitGrantsMember
/ us-gaap_PlanNameAxis
= oge_TotalShareholderReturnMember
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       41,554us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted
/ us-gaap_AwardTypeAxis
= oge_A2012PerformanceUnitGrantsMember
/ us-gaap_PlanNameAxis
= oge_TotalShareholderReturnMember
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       41,554us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted
/ us-gaap_AwardTypeAxis
= oge_A2012PerformanceUnitGrantsMember
/ us-gaap_PlanNameAxis
= oge_TotalShareholderReturnMember
Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value       47.71us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= oge_A2012PerformanceUnitGrantsMember
/ us-gaap_PlanNameAxis
= oge_TotalShareholderReturnMember
Common Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures 494,637us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation
/ oge_ShareBasedCompensationSharesIssuedReturnedAndCashRecievedFromExerciseAxis
= us-gaap_CommonStockMember
548,344us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation
/ oge_ShareBasedCompensationSharesIssuedReturnedAndCashRecievedFromExerciseAxis
= us-gaap_CommonStockMember
849,110us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation
/ oge_ShareBasedCompensationSharesIssuedReturnedAndCashRecievedFromExerciseAxis
= us-gaap_CommonStockMember
 
Restricted Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares Paid for Tax Withholding 2,901us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation
/ oge_ShareBasedCompensationSharesIssuedReturnedAndCashRecievedFromExerciseAxis
= us-gaap_RestrictedStockMember
     
[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, 2013 which were settled in February 2014.
[4] The intrinsic value of the performance units based on total shareholder return and earnings per share is $0.0 million and $6.2 million, respectively.