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Stock-Based Compensation (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
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 $ 1.1us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense $ 0.9us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense $ 1.2us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]      
Minimum payout range 0.00%ogec_MinimumPayoutRange    
Maximum payout range 200.00%ogec_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 3.2us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized    
Options, Exercises in Period, Total Intrinsic Value   0.2us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue [1] 0.2us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue [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 $ 34.73us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= ogec_TotalShareholderReturnMember		 $ 25.89us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= ogec_TotalShareholderReturnMember		 $ 25.91us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= ogec_TotalShareholderReturnMember
Expected Dividend Rate 2.50%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate
/ us-gaap_AwardTypeAxis
= ogec_TotalShareholderReturnMember		 2.80%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate
/ us-gaap_AwardTypeAxis
= ogec_TotalShareholderReturnMember		 3.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate
/ us-gaap_AwardTypeAxis
= ogec_TotalShareholderReturnMember
Expected Volatility Rate 20.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
/ us-gaap_AwardTypeAxis
= ogec_TotalShareholderReturnMember		 20.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
/ us-gaap_AwardTypeAxis
= ogec_TotalShareholderReturnMember		 22.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
/ us-gaap_AwardTypeAxis
= ogec_TotalShareholderReturnMember
Risk Free Interest Rate 0.67%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
/ us-gaap_AwardTypeAxis
= ogec_TotalShareholderReturnMember		 0.37%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
/ us-gaap_AwardTypeAxis
= ogec_TotalShareholderReturnMember		 0.38%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
/ us-gaap_AwardTypeAxis
= ogec_TotalShareholderReturnMember
Expected Term 2 years 10 months 17 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 212,280us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber
/ us-gaap_AwardTypeAxis
= ogec_TotalShareholderReturnMember		 206,826us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber
/ us-gaap_AwardTypeAxis
= ogec_TotalShareholderReturnMember		  
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted 67,773us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted
/ us-gaap_AwardTypeAxis
= ogec_TotalShareholderReturnMember		 [2] 71,850us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted
/ us-gaap_AwardTypeAxis
= ogec_TotalShareholderReturnMember		 81,122us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted
/ us-gaap_AwardTypeAxis
= ogec_TotalShareholderReturnMember
Equity Instruments Other than Options, Converted in Period (68,750)ogec_EquityInstrumentsOtherThanOptionsConvertedInPeriod
/ us-gaap_AwardTypeAxis
= ogec_TotalShareholderReturnMember		 [3]    
Equity Instruments Other than Options, Vested in Period (73,020)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= ogec_TotalShareholderReturnMember		    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period (1,494)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
/ us-gaap_AwardTypeAxis
= ogec_TotalShareholderReturnMember		    
Equity Other Than Options, Employee Migration 7,925ogec_EquityOtherThanOptionsEmployeeMigration
/ us-gaap_AwardTypeAxis
= ogec_TotalShareholderReturnMember		 [4]    
Awards Other than Options, Fully Vested, Outstanding 73,020ogec_AwardsOtherThanOptionsFullyVested
/ us-gaap_AwardTypeAxis
= ogec_TotalShareholderReturnMember		    
Equity Instruments Other than Options, Converted, Aggregrate Intrinsic Value 3.7ogec_EquityInstrumentsOtherThanOptionsConvertedAggregrateIntrinsicValue
/ us-gaap_AwardTypeAxis
= ogec_TotalShareholderReturnMember		 [3]    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Outstanding 0us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueOutstanding
/ us-gaap_AwardTypeAxis
= ogec_TotalShareholderReturnMember		    
Equity Instruments Other than Options, Fully Vested, Aggregrate Intrinsic Value 0ogec_EquityInstrumentsOtherThanOptionsFullyVestedAggregrateIntrinsicValue
/ us-gaap_AwardTypeAxis
= ogec_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, Beginning Balance 138,076us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= ogec_TotalShareholderReturnMember		    
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted 67,773us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted
/ us-gaap_AwardTypeAxis
= ogec_TotalShareholderReturnMember		 [2] 71,850us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted
/ us-gaap_AwardTypeAxis
= ogec_TotalShareholderReturnMember		 81,122us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted
/ us-gaap_AwardTypeAxis
= ogec_TotalShareholderReturnMember
Equity Instruments Other than Options, Vested in Period (73,020)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= ogec_TotalShareholderReturnMember		    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period (1,494)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
/ us-gaap_AwardTypeAxis
= ogec_TotalShareholderReturnMember		    
Equity Other Than Options, Employee Migration 7,925ogec_EquityOtherThanOptionsEmployeeMigration
/ us-gaap_AwardTypeAxis
= ogec_TotalShareholderReturnMember		 [4]    
Equity Instruments Other than Options, Nonvested, Ending Balance 139,260us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= ogec_TotalShareholderReturnMember		 138,076us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= ogec_TotalShareholderReturnMember		  
Awards Other than Options, Vested and Expected to Vest 123,848ogec_AwardsOtherThanOptionsVestedAndExpectedToVest
/ us-gaap_AwardTypeAxis
= ogec_TotalShareholderReturnMember		 [5]    
Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value $ 30.24us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= ogec_TotalShareholderReturnMember		 $ 25.90us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= ogec_TotalShareholderReturnMember		  
Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value $ 34.73us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= ogec_TotalShareholderReturnMember		 $ 25.89us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= ogec_TotalShareholderReturnMember		 $ 25.91us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= ogec_TotalShareholderReturnMember
Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value $ 25.91us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= ogec_TotalShareholderReturnMember		    
Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value $ 28.01us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= ogec_TotalShareholderReturnMember		    
Equity Other Than Options, Employee Migration, Weighted Average Grant Date Fair Value $ 27.20ogec_EquityOtherThanOptionsEmployeeMigrationWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= ogec_TotalShareholderReturnMember		    
Equity Instruments Other than Options, Expected to Vest, Intrinsic Value 0ogec_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsExpectedtoVestIntrinsicValue
/ us-gaap_AwardTypeAxis
= ogec_TotalShareholderReturnMember		    
Fair Value of Vested Performance Units and Restricted Stock 1.9ogec_FairValueOfVestedPerformanceUnitsAndRestrictedStock
/ us-gaap_AwardTypeAxis
= ogec_TotalShareholderReturnMember		 1.6ogec_FairValueOfVestedPerformanceUnitsAndRestrictedStock
/ us-gaap_AwardTypeAxis
= ogec_TotalShareholderReturnMember		 1.4ogec_FairValueOfVestedPerformanceUnitsAndRestrictedStock
/ us-gaap_AwardTypeAxis
= ogec_TotalShareholderReturnMember
Total Compensation Cost Not yet Recognized 2.3us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= ogec_TotalShareholderReturnMember		    
Total Compensation Cost Not yet Recognized, Period for Recognition 1 year 8 months 12 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 $ 34.74us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= ogec_PerformanceUnitsRelatedToEarningsPerShareMember		 $ 26.73us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= ogec_PerformanceUnitsRelatedToEarningsPerShareMember		 $ 23.82us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= ogec_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 70,763us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber
/ us-gaap_AwardTypeAxis
= ogec_PerformanceUnitsRelatedToEarningsPerShareMember		 68,938us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber
/ us-gaap_AwardTypeAxis
= ogec_PerformanceUnitsRelatedToEarningsPerShareMember		  
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted 22,592us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted
/ us-gaap_AwardTypeAxis
= ogec_PerformanceUnitsRelatedToEarningsPerShareMember		 [2] 23,952us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted
/ us-gaap_AwardTypeAxis
= ogec_PerformanceUnitsRelatedToEarningsPerShareMember		 27,038us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted
/ us-gaap_AwardTypeAxis
= ogec_PerformanceUnitsRelatedToEarningsPerShareMember
Equity Instruments Other than Options, Converted in Period (22,914)ogec_EquityInstrumentsOtherThanOptionsConvertedInPeriod
/ us-gaap_AwardTypeAxis
= ogec_PerformanceUnitsRelatedToEarningsPerShareMember		 [3]    
Equity Instruments Other than Options, Vested in Period (24,339)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= ogec_PerformanceUnitsRelatedToEarningsPerShareMember		    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period (496)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
/ us-gaap_AwardTypeAxis
= ogec_PerformanceUnitsRelatedToEarningsPerShareMember		    
Equity Other Than Options, Employee Migration 2,643ogec_EquityOtherThanOptionsEmployeeMigration
/ us-gaap_AwardTypeAxis
= ogec_PerformanceUnitsRelatedToEarningsPerShareMember		 [4]    
Awards Other than Options, Fully Vested, Outstanding 24,339ogec_AwardsOtherThanOptionsFullyVested
/ us-gaap_AwardTypeAxis
= ogec_PerformanceUnitsRelatedToEarningsPerShareMember		    
Equity Instruments Other than Options, Converted, Aggregrate Intrinsic Value 1.6ogec_EquityInstrumentsOtherThanOptionsConvertedAggregrateIntrinsicValue
/ us-gaap_AwardTypeAxis
= ogec_PerformanceUnitsRelatedToEarningsPerShareMember		 [3]    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Outstanding 1.7us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueOutstanding
/ us-gaap_AwardTypeAxis
= ogec_PerformanceUnitsRelatedToEarningsPerShareMember		    
Equity Instruments Other than Options, Fully Vested, Aggregrate Intrinsic Value 1.0ogec_EquityInstrumentsOtherThanOptionsFullyVestedAggregrateIntrinsicValue
/ us-gaap_AwardTypeAxis
= ogec_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, Beginning Balance 46,024us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= ogec_PerformanceUnitsRelatedToEarningsPerShareMember		    
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted 22,592us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted
/ us-gaap_AwardTypeAxis
= ogec_PerformanceUnitsRelatedToEarningsPerShareMember		 [2] 23,952us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted
/ us-gaap_AwardTypeAxis
= ogec_PerformanceUnitsRelatedToEarningsPerShareMember		 27,038us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted
/ us-gaap_AwardTypeAxis
= ogec_PerformanceUnitsRelatedToEarningsPerShareMember
Equity Instruments Other than Options, Vested in Period (24,339)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= ogec_PerformanceUnitsRelatedToEarningsPerShareMember		    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period (496)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
/ us-gaap_AwardTypeAxis
= ogec_PerformanceUnitsRelatedToEarningsPerShareMember		    
Equity Other Than Options, Employee Migration 2,643ogec_EquityOtherThanOptionsEmployeeMigration
/ us-gaap_AwardTypeAxis
= ogec_PerformanceUnitsRelatedToEarningsPerShareMember		 [4]    
Equity Instruments Other than Options, Nonvested, Ending Balance 46,424us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= ogec_PerformanceUnitsRelatedToEarningsPerShareMember		 46,024us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= ogec_PerformanceUnitsRelatedToEarningsPerShareMember		  
Awards Other than Options, Vested and Expected to Vest 41,287ogec_AwardsOtherThanOptionsVestedAndExpectedToVest
/ us-gaap_AwardTypeAxis
= ogec_PerformanceUnitsRelatedToEarningsPerShareMember		 [5]    
Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value $ 30.67us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= ogec_PerformanceUnitsRelatedToEarningsPerShareMember		 $ 25.25us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= ogec_PerformanceUnitsRelatedToEarningsPerShareMember		  
Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value $ 34.74us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= ogec_PerformanceUnitsRelatedToEarningsPerShareMember		 $ 26.73us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= ogec_PerformanceUnitsRelatedToEarningsPerShareMember		 $ 23.82us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= ogec_PerformanceUnitsRelatedToEarningsPerShareMember
Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value $ 23.82us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= ogec_PerformanceUnitsRelatedToEarningsPerShareMember		    
Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value $ 27.08us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= ogec_PerformanceUnitsRelatedToEarningsPerShareMember		    
Equity Other Than Options, Employee Migration, Weighted Average Grant Date Fair Value $ 26.50ogec_EquityOtherThanOptionsEmployeeMigrationWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= ogec_PerformanceUnitsRelatedToEarningsPerShareMember		    
Equity Instruments Other than Options, Expected to Vest, Intrinsic Value 1.5ogec_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsExpectedtoVestIntrinsicValue
/ us-gaap_AwardTypeAxis
= ogec_PerformanceUnitsRelatedToEarningsPerShareMember		    
Fair Value of Vested Performance Units and Restricted Stock 0.7ogec_FairValueOfVestedPerformanceUnitsAndRestrictedStock
/ us-gaap_AwardTypeAxis
= ogec_PerformanceUnitsRelatedToEarningsPerShareMember		 1.0ogec_FairValueOfVestedPerformanceUnitsAndRestrictedStock
/ us-gaap_AwardTypeAxis
= ogec_PerformanceUnitsRelatedToEarningsPerShareMember		 0.8ogec_FairValueOfVestedPerformanceUnitsAndRestrictedStock
/ us-gaap_AwardTypeAxis
= ogec_PerformanceUnitsRelatedToEarningsPerShareMember
Total Compensation Cost Not yet Recognized 0.7us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= ogec_PerformanceUnitsRelatedToEarningsPerShareMember		    
Total Compensation Cost Not yet Recognized, Period for Recognition 1 year 9 months 29 days    
Performance Shares [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation expense 2.8us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember		 2.2us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember		 2.6us-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 3.0us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember		    
Restricted Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation expense 0.1us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		 0.1us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		 0.1us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value $ 35.66us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		    
Options, Grants in Period, Weighted Average Grant Date Fair Value $ 35.66us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		 $ 29.71us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		 $ 26.93us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ 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 9,198us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		 5,948us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		  
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted 6,204us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		 3,824us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		 2,216us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
Equity Instruments Other than Options, Vested in Period (2,954)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		    
Equity Other Than Options, Employee Migration 0ogec_EquityOtherThanOptionsEmployeeMigration
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		 [4]    
Equity Instruments Other than Options, Vested in Period, Aggregate Intrinsic Value 0.1us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueVested
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Outstanding 0.3us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueOutstanding
/ us-gaap_AwardTypeAxis
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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 5,948us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
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Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted 6,204us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted
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/ us-gaap_AwardTypeAxis
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/ us-gaap_AwardTypeAxis
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Equity Instruments Other than Options, Vested in Period (2,954)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
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Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
/ us-gaap_AwardTypeAxis
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Equity Other Than Options, Employee Migration 0ogec_EquityOtherThanOptionsEmployeeMigration
/ us-gaap_AwardTypeAxis
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Equity Instruments Other than Options, Nonvested, Ending Balance 9,198us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
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/ us-gaap_AwardTypeAxis
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Awards Other than Options, Vested and Expected to Vest 9,198ogec_AwardsOtherThanOptionsVestedAndExpectedToVest
/ us-gaap_AwardTypeAxis
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Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value $ 33.57us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
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/ us-gaap_AwardTypeAxis
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Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value $ 35.66us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
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Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value $ 26.65us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue
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Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value $ 0.00us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue
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Equity Other Than Options, Employee Migration, Weighted Average Grant Date Fair Value $ 0.00ogec_EquityOtherThanOptionsEmployeeMigrationWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
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Fair Value of Vested Performance Units and Restricted Stock 0.1ogec_FairValueOfVestedPerformanceUnitsAndRestrictedStock
/ us-gaap_AwardTypeAxis
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/ us-gaap_AwardTypeAxis
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Total Compensation Cost Not yet Recognized 0.2us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
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Total Compensation Cost Not yet Recognized, Period for Recognition 2 years 6 months 15 days    
Stock Compensation Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation expense 2.9us-gaap_AllocatedShareBasedCompensationExpense
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/ us-gaap_AwardTypeAxis
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Performance Units Related to Earnings Per Share [Member] | Performance Shares [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation expense 0.8us-gaap_AllocatedShareBasedCompensationExpense
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= ogec_PerformanceUnitsRelatedToEarningsPerShareMember		 0.5us-gaap_AllocatedShareBasedCompensationExpense
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Total Shareholder Return [Member] | Performance Shares [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation expense $ 2.0us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
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/ us-gaap_PlanNameAxis
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/ us-gaap_PlanNameAxis
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Common Stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures 100,640us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation
/ ogec_ShareBasedCompensationSharesIssuedReturnedAndCashRecievedFromExerciseAxis
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/ ogec_ShareBasedCompensationSharesIssuedReturnedAndCashRecievedFromExerciseAxis
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Restricted Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares Paid for Tax Withholding 1,076us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation
/ ogec_ShareBasedCompensationSharesIssuedReturnedAndCashRecievedFromExerciseAxis
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[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] 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 $0.0 million and $1.5 million, respectively.