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Income Taxes (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Current Federal Tax Expense (Benefit) $ 0us-gaap_CurrentFederalTaxExpenseBenefit $ 0us-gaap_CurrentFederalTaxExpenseBenefit $ (9.1)us-gaap_CurrentFederalTaxExpenseBenefit  
Current State and Local Tax Expense (Benefit) (4.5)us-gaap_CurrentStateAndLocalTaxExpenseBenefit 4.3us-gaap_CurrentStateAndLocalTaxExpenseBenefit 0.5us-gaap_CurrentStateAndLocalTaxExpenseBenefit  
Current Income Tax Expense (Benefit) (4.5)us-gaap_CurrentIncomeTaxExpenseBenefit 4.3us-gaap_CurrentIncomeTaxExpenseBenefit (8.6)us-gaap_CurrentIncomeTaxExpenseBenefit  
Deferred Federal Income Tax Expense (Benefit) 160.0us-gaap_DeferredFederalIncomeTaxExpenseBenefit 154.4us-gaap_DeferredFederalIncomeTaxExpenseBenefit 147.3us-gaap_DeferredFederalIncomeTaxExpenseBenefit  
Deferred State and Local Income Tax Expense (Benefit) 18.2us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit (26.4)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit (1.5)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit  
Deferred Income Tax Expense (Benefit) 178.2us-gaap_DeferredIncomeTaxExpenseBenefit 128.0us-gaap_DeferredIncomeTaxExpenseBenefit 145.8us-gaap_DeferredIncomeTaxExpenseBenefit  
Investment Tax Credit (0.9)us-gaap_InvestmentTaxCredit (2.0)us-gaap_InvestmentTaxCredit (2.1)us-gaap_InvestmentTaxCredit  
Income Tax Expense (Benefit) 172.8us-gaap_IncomeTaxExpenseBenefit 130.3us-gaap_IncomeTaxExpenseBenefit 135.1us-gaap_IncomeTaxExpenseBenefit  
Statutory Federal tax rate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate  
Amortization of net unfunded deferred taxes 0.60%oge_EffectiveIncomeTaxRateReconciliationAmortizationOfNetUnfundedDeferredTaxes 0.60%oge_EffectiveIncomeTaxRateReconciliationAmortizationOfNetUnfundedDeferredTaxes 0.80%oge_EffectiveIncomeTaxRateReconciliationAmortizationOfNetUnfundedDeferredTaxes  
State income taxes, net of Federal income tax benefit 1.20%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes 0.40%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes (0.10%)us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes  
Federal investment tax credits, net (0.20%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsInvestment (0.40%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsInvestment (0.40%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsInvestment  
401(k) dividends (0.50%)us-gaap_EffectiveIncomeTaxRateReconciliationDeductionsEmployeeStockOwnershipPlanDividends (0.50%)us-gaap_EffectiveIncomeTaxRateReconciliationDeductionsEmployeeStockOwnershipPlanDividends (0.50%)us-gaap_EffectiveIncomeTaxRateReconciliationDeductionsEmployeeStockOwnershipPlanDividends  
Income attributable to noncontrolling interest 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationMinorityInterestIncomeExpense (0.30%)us-gaap_EffectiveIncomeTaxRateReconciliationMinorityInterestIncomeExpense (1.60%)us-gaap_EffectiveIncomeTaxRateReconciliationMinorityInterestIncomeExpense  
Federal renewable energy credit (6.70%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsOther [1] (7.20%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsOther [1] (7.20%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsOther [1]  
Uncertain tax positions 0.50%us-gaap_EffectiveIncomeTaxRateReconciliationTaxContingencies 1.50%us-gaap_EffectiveIncomeTaxRateReconciliationTaxContingencies 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationTaxContingencies  
Remeasurement of state deferred tax liabilities 0.40%oge_EffectiveIncomeTaxRateReconciliationChangeinDeferredTaxLiabilitiesValuationAllowancePercent (4.10%)oge_EffectiveIncomeTaxRateReconciliationChangeinDeferredTaxLiabilitiesValuationAllowancePercent 0.00%oge_EffectiveIncomeTaxRateReconciliationChangeinDeferredTaxLiabilitiesValuationAllowancePercent  
Other 0.10%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments (0.10%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments  
Effective income tax rate 30.40%us-gaap_EffectiveIncomeTaxRateContinuingOperations 24.90%us-gaap_EffectiveIncomeTaxRateContinuingOperations 26.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations  
Net operating losses 158.4us-gaap_DeferredTaxAssetsOperatingLossCarryforwards 180.1us-gaap_DeferredTaxAssetsOperatingLossCarryforwards    
Accrued liabilities 15.6us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities 22.3us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities    
Federal tax credits 12.4oge_CurrentDeferredTaxAssetsFederalTaxCredits 8.0oge_CurrentDeferredTaxAssetsFederalTaxCredits    
Accrued vacation 4.4us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOther 4.7us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOther    
Uncollectible accounts 0.6us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts 0.7us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts    
Total Current Deferred Income Tax Assets 191.4us-gaap_DeferredTaxAssetsGrossCurrent 215.8us-gaap_DeferredTaxAssetsGrossCurrent    
Accelerated depreciation and other property related differences 1,936.8us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment 1,753.3us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment    
Investment in Enable Midstream Partners 641.8oge_NonCurrentDeferredTaxLiabilitiesInvestmentinEnableMidstreamPartners 630.5oge_NonCurrentDeferredTaxLiabilitiesInvestmentinEnableMidstreamPartners    
Company pension plan 34.6us-gaap_DeferredTaxLiabilitiesPrepaidExpenses 55.1us-gaap_DeferredTaxLiabilitiesPrepaidExpenses    
Income taxes refundable to customers, net 21.7oge_DeferredTaxLiabilitiesIncomeTaxesRefundableToCustomersNet 21.9oge_DeferredTaxLiabilitiesIncomeTaxesRefundableToCustomersNet    
Regulatory asset 24.7us-gaap_DeferredTaxLiabilitiesRegulatoryAssets 26.1us-gaap_DeferredTaxLiabilitiesRegulatoryAssets    
Bond redemption-unamortized costs 5.3oge_DeferredTaxLiabilitiesUnamortizedBondRedemptionCosts 3.6oge_DeferredTaxLiabilitiesUnamortizedBondRedemptionCosts    
Derivative instruments 1.8us-gaap_DeferredTaxLiabilitiesDerivatives 1.6us-gaap_DeferredTaxLiabilitiesDerivatives    
Total Non-Current Deferred Income Tax Liabilities 2,666.7us-gaap_DeferredTaxLiabilitiesGrossNoncurrent 2,492.1us-gaap_DeferredTaxLiabilitiesGrossNoncurrent    
Federal tax credits (139.0)us-gaap_DeferredTaxAssetsTaxCreditCarryforwards (105.2)us-gaap_DeferredTaxAssetsTaxCreditCarryforwards    
State tax credits (98.6)oge_NonCurrentDeferredTaxAssetsStateTaxCredits (92.6)oge_NonCurrentDeferredTaxAssetsStateTaxCredits    
Postretirement medical and life insurance benefits (56.4)us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits (62.8)us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits    
Regulatory liabilities (58.0)oge_NonCurrentDeferredTaxAssetsRegulatoryLiabilities (61.3)oge_NonCurrentDeferredTaxAssetsRegulatoryLiabilities    
Asset retirement obligations (21.4)us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAssetRetirementObligations (20.8)us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAssetRetirementObligations    
Net operating losses (19.8)oge_NonCurrentDeferredTaxAssetNetOperatingLosses (18.8)oge_NonCurrentDeferredTaxAssetNetOperatingLosses    
Other (4.8)us-gaap_DeferredTaxAssetsOther (4.6)us-gaap_DeferredTaxAssetsOther    
Deferred Federal investment tax credits (0.4)oge_NonCurrentDeferredTaxAssetsDeferredFederalInvestmentTaxCredits (0.7)oge_NonCurrentDeferredTaxAssetsDeferredFederalInvestmentTaxCredits    
Total Non-Current Deferred Income Tax Assets (398.4)us-gaap_DeferredTaxAssetsGrossNoncurrent (366.8)us-gaap_DeferredTaxAssetsGrossNoncurrent    
Non-Current Deferred Income Tax Liabilities, net 2,268.3us-gaap_DeferredTaxLiabilitiesNoncurrent 2,125.3us-gaap_DeferredTaxLiabilitiesNoncurrent    
Unrecognized Tax Benefits 10.5us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate      
Unrecognized Tax Benefits 10.5us-gaap_UnrecognizedTaxBenefits 7.8us-gaap_UnrecognizedTaxBenefits 0us-gaap_UnrecognizedTaxBenefits 0us-gaap_UnrecognizedTaxBenefits
Current year additions 2.7us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions 2.7us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions 0us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions  
Prior year additions 0us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions 5.1us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions 0us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions  
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued 0us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued      
Unrecognized Tax Benefits, Period Increase (Decrease) 2.7us-gaap_UnrecognizedTaxBenefitsPeriodIncreaseDecrease      
Employee Service Share-based Compensation, Unrecognized Tax Benefit from Compensation Expense 31.6oge_EmployeeServiceSharebasedCompensationUnrecognizedTaxBenefitfromCompensationExpense      
State operating loss [Member]        
Tax Credit Carryforward, Amount 857.0us-gaap_TaxCreditCarryforwardAmount
/ us-gaap_TaxCreditCarryforwardAxis
= oge_StateOperatingLossMember		      
Tax Credit Carryforward, Deferred Tax Asset 31.6us-gaap_TaxCreditCarryforwardDeferredTaxAsset
/ us-gaap_TaxCreditCarryforwardAxis
= oge_StateOperatingLossMember		      
Tax Credit Carryforward, Expiration Date Dec. 31, 2030      
Federal operating loss [Member]        
Tax Credit Carryforward, Amount 418.6us-gaap_TaxCreditCarryforwardAmount
/ us-gaap_TaxCreditCarryforwardAxis
= oge_FederalOperatingLossMemberMember		      
Tax Credit Carryforward, Deferred Tax Asset 146.6us-gaap_TaxCreditCarryforwardDeferredTaxAsset
/ us-gaap_TaxCreditCarryforwardAxis
= oge_FederalOperatingLossMemberMember		      
Tax Credit Carryforward, Expiration Date Dec. 31, 2030      
Federal tax credits [Member]        
Tax Credit Carryforward, Amount 151.5us-gaap_TaxCreditCarryforwardAmount
/ us-gaap_TaxCreditCarryforwardAxis
= oge_FederalTaxCreditsMemberMember		      
Tax Credit Carryforward, Deferred Tax Asset 151.4us-gaap_TaxCreditCarryforwardDeferredTaxAsset
/ us-gaap_TaxCreditCarryforwardAxis
= oge_FederalTaxCreditsMemberMember		      
Tax Credit Carryforward, Expiration Date Dec. 31, 2029      
Oklahoma investment tax credits [Member]        
Tax Credit Carryforward, Amount 115.3us-gaap_TaxCreditCarryforwardAmount
/ us-gaap_TaxCreditCarryforwardAxis
= oge_OklahomaInvestmentTaxCreditsMemberMember		      
Tax Credit Carryforward, Deferred Tax Asset 75.1us-gaap_TaxCreditCarryforwardDeferredTaxAsset
/ us-gaap_TaxCreditCarryforwardAxis
= oge_OklahomaInvestmentTaxCreditsMemberMember		      
Oklahoma capital investment board credits [Member]        
Tax Credit Carryforward, Amount 7.3us-gaap_TaxCreditCarryforwardAmount
/ us-gaap_TaxCreditCarryforwardAxis
= oge_OklahomaCapitalInvestmentBoardCreditsMemberMember		      
Tax Credit Carryforward, Deferred Tax Asset 7.3us-gaap_TaxCreditCarryforwardDeferredTaxAsset
/ us-gaap_TaxCreditCarryforwardAxis
= oge_OklahomaCapitalInvestmentBoardCreditsMemberMember		      
Oklahoma zero emission tax credits [Member]        
Tax Credit Carryforward, Amount 24.3us-gaap_TaxCreditCarryforwardAmount
/ us-gaap_TaxCreditCarryforwardAxis
= oge_OklahomaZeroEmissionTaxCreditsMemberMember		      
Tax Credit Carryforward, Deferred Tax Asset 16.2us-gaap_TaxCreditCarryforwardDeferredTaxAsset
/ us-gaap_TaxCreditCarryforwardAxis
= oge_OklahomaZeroEmissionTaxCreditsMemberMember		      
Tax Credit Carryforward, Expiration Date Dec. 31, 2020      
State and Local Jurisdiction [Member]        
Unrecognized Tax Benefits, Period Increase (Decrease) 4.2us-gaap_UnrecognizedTaxBenefitsPeriodIncreaseDecrease
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember		      
Federal operating loss [Member]        
Net operating losses $ 158.4us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= oge_FederaloperatinglossMember		      
[1] Represents credits associated with the production from OG&E's wind farms.