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Derivative Instruments and Hedging Activities, Income Statement Presentation Related to Derivative Instruments (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Amount Recognized in Income | $ 0 us-gaap_DerivativeGainLossOnDerivativeNet |  |
Enogex [Member] | Not Designated as Hedging Instrument [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Amount Recognized in Income |  | (5.1)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / dei_LegalEntityAxis = oge_EnogexMember | (10.6)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / dei_LegalEntityAxis = oge_EnogexMember
Enogex [Member] | Natural Gas [Member] | Fixed Swaps/Futures [Member] | Not Designated as Hedging Instrument [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Amount Recognized in Income |  | 1.0 us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeByNatureAxis = oge_FixedSwapsFuturesMember / us-gaap_DerivativeInstrumentRiskAxis = oge_NaturalGasMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / dei_LegalEntityAxis = oge_EnogexMember | 1.1 us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeByNatureAxis = oge_FixedSwapsFuturesMember / us-gaap_DerivativeInstrumentRiskAxis = oge_NaturalGasMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / dei_LegalEntityAxis = oge_EnogexMember
Enogex [Member] | Sales [Member] | Natural Gas [Member] | Physical [Member] | Not Designated as Hedging Instrument [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Amount Recognized in Income |  | (6.1)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeByNatureAxis = oge_PhysicalMember / us-gaap_DerivativeInstrumentRiskAxis = oge_NaturalGasMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_IncomeStatementLocationAxis = us-gaap_SalesMember / dei_LegalEntityAxis = oge_EnogexMember | (11.7)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeByNatureAxis = oge_PhysicalMember / us-gaap_DerivativeInstrumentRiskAxis = oge_NaturalGasMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_IncomeStatementLocationAxis = us-gaap_SalesMember / dei_LegalEntityAxis = oge_EnogexMember
Cash Flow Hedging [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Amount Recognized in Other Comprehensive Income |  | (0.2)us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember | 0.5 us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember
Amount Reclassifed from Accumulated Other Comprehensive Income (Loss) into Income |  | 5.0 us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember | 4.8 us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember
Amount Recognized in Income |  | 0 us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember | 0 us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember
Cash Flow Hedging [Member] | Enogex [Member] | Natural Gas [Member] | Fixed Swaps/Futures [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Amount Recognized in Other Comprehensive Income |  | (0.2)us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet / us-gaap_DerivativeByNatureAxis = oge_FixedSwapsFuturesMember / us-gaap_DerivativeInstrumentRiskAxis = oge_NaturalGasMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / dei_LegalEntityAxis = oge_EnogexMember | 0.5 us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet / us-gaap_DerivativeByNatureAxis = oge_FixedSwapsFuturesMember / us-gaap_DerivativeInstrumentRiskAxis = oge_NaturalGasMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / dei_LegalEntityAxis = oge_EnogexMember
Amount Reclassifed from Accumulated Other Comprehensive Income (Loss) into Income |  | 5.2 us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet / us-gaap_DerivativeByNatureAxis = oge_FixedSwapsFuturesMember / us-gaap_DerivativeInstrumentRiskAxis = oge_NaturalGasMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / dei_LegalEntityAxis = oge_EnogexMember | 5.2 us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet / us-gaap_DerivativeByNatureAxis = oge_FixedSwapsFuturesMember / us-gaap_DerivativeInstrumentRiskAxis = oge_NaturalGasMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / dei_LegalEntityAxis = oge_EnogexMember
Amount Recognized in Income |  | 0 us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeByNatureAxis = oge_FixedSwapsFuturesMember / us-gaap_DerivativeInstrumentRiskAxis = oge_NaturalGasMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / dei_LegalEntityAxis = oge_EnogexMember | 0 us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeByNatureAxis = oge_FixedSwapsFuturesMember / us-gaap_DerivativeInstrumentRiskAxis = oge_NaturalGasMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / dei_LegalEntityAxis = oge_EnogexMember
Cash Flow Hedging [Member] | OGE Energy Corp. [Member] | Interest Rate Swap [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Amount Recognized in Other Comprehensive Income |  | 0 us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet / us-gaap_DerivativeByNatureAxis = us-gaap_InterestRateSwapMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / dei_LegalEntityAxis = oge_OgeEnergyCorpMember | 0 us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet / us-gaap_DerivativeByNatureAxis = us-gaap_InterestRateSwapMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / dei_LegalEntityAxis = oge_OgeEnergyCorpMember
Amount Reclassifed from Accumulated Other Comprehensive Income (Loss) into Income |  | (0.2)us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet / us-gaap_DerivativeByNatureAxis = us-gaap_InterestRateSwapMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / dei_LegalEntityAxis = oge_OgeEnergyCorpMember | (0.4)us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet / us-gaap_DerivativeByNatureAxis = us-gaap_InterestRateSwapMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / dei_LegalEntityAxis = oge_OgeEnergyCorpMember
Amount Recognized in Income |  | $ 0 us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeByNatureAxis = us-gaap_InterestRateSwapMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / dei_LegalEntityAxis = oge_OgeEnergyCorpMember | $ 0 us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeByNatureAxis = us-gaap_InterestRateSwapMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / dei_LegalEntityAxis = oge_OgeEnergyCorpMember

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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5618551-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a),(c),(d),(e) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624171-113959 + Details
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- Definition The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624171-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4D -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624177-113959 + Details
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- Definition The effective portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624171-113959 + Details
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