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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Net income $ 395.8us-gaap_ProfitLoss $ 393.8us-gaap_ProfitLoss $ 385.0us-gaap_ProfitLoss
Pension Plan and Restoration of Retirement Income Plan:      
Amortization of deferred net loss, net of tax of $1.2, $2.4 and $1.7, respectively 1.8us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax 3.7us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax 3.0us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax
Net gain (loss) arising during the period, net of tax of ($7.0), $7.8 and ($5.6), respectively (11.1)us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax 12.4us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax (10.2)us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax
Amortization of prior service cost, net of tax of $0, $0 and $0.2, respectively 0us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax 0us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax 0.2us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax
Settlement (Curtailment) cost, net of tax of ($0.1), $1.9 and $0, respectively (0.1)us-gaap_OtherComprehensiveIncomeLossFinalizationOfPensionAndNonPensionPostretirementPlanValuationNetOfTax 3.0us-gaap_OtherComprehensiveIncomeLossFinalizationOfPensionAndNonPensionPostretirementPlanValuationNetOfTax 0us-gaap_OtherComprehensiveIncomeLossFinalizationOfPensionAndNonPensionPostretirementPlanValuationNetOfTax
Postretirement Benefit Plans:      
Amortization of deferred net loss, net of tax of $0.5, $1.3 and ($1.1), respectively 0.9oge_OtherComprehensiveIncomeReclassificationOfDefinedBenefitPostretirementPlansNetGainLossRecognizedInNetPeriodicBenefitCostNetOfTax 2.0oge_OtherComprehensiveIncomeReclassificationOfDefinedBenefitPostretirementPlansNetGainLossRecognizedInNetPeriodicBenefitCostNetOfTax 2.0oge_OtherComprehensiveIncomeReclassificationOfDefinedBenefitPostretirementPlansNetGainLossRecognizedInNetPeriodicBenefitCostNetOfTax
Net gain (loss) arising during the period, net of tax of ($1.9), $4.4 and ($1.1), respectively (3.1)oge_OtherComprehensiveIncomePostretirementPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax 6.9oge_OtherComprehensiveIncomePostretirementPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax (2.3)oge_OtherComprehensiveIncomePostretirementPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax
Amortization of deferred net transition obligation, net of tax of $0, $0 and $0.1, respectively 0us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetTransitionAssetObligationNetOfTax 0us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetTransitionAssetObligationNetOfTax 0.1us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetTransitionAssetObligationNetOfTax
Amortization of prior service cost, net of tax of ($1.1), ($1.1) and ($1.0), respectively (1.8)oge_OtherComprehensiveIncomeAmortizationOfDefinedBenefitPostretirementPlansNetPriorServiceCostRecognizedInNetPeriodicPostretirementCostNetOfTax (1.8)oge_OtherComprehensiveIncomeAmortizationOfDefinedBenefitPostretirementPlansNetPriorServiceCostRecognizedInNetPeriodicPostretirementCostNetOfTax (1.8)oge_OtherComprehensiveIncomeAmortizationOfDefinedBenefitPostretirementPlansNetPriorServiceCostRecognizedInNetPeriodicPostretirementCostNetOfTax
Deferred commodity contracts hedging (gains) losses reclassified in net income, net of tax of $0, $0.4 and ($1.6), respectively 0us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax 0.6us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax (3.6)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax
Deferred commodity contracts hedging gains (losses), net of tax of $0, $0 and $0.1, respectively 0us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax 0us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax 0.4us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax
Amortization of deferred interest rate swap hedging losses, net of tax of $0.1, $0.1 and $0.2, respectively 0.2oge_OtherComprehensiveIncomeAmortizationOfInterestRateSwapNetOfTax 0.3oge_OtherComprehensiveIncomeAmortizationOfInterestRateSwapNetOfTax 0.2oge_OtherComprehensiveIncomeAmortizationOfInterestRateSwapNetOfTax
Other comprehensive income, net of tax (13.2)us-gaap_OtherComprehensiveIncomeLossNetOfTax 27.1us-gaap_OtherComprehensiveIncomeLossNetOfTax (12.0)us-gaap_OtherComprehensiveIncomeLossNetOfTax
Comprehensive income 382.6us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest 420.9us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest 373.0us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest
Less: Comprehensive income attributable to noncontrolling interests 0us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest 6.3us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest 26.5us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest
Less: Deconsolidation of Enogex Holdings 0us-gaap_NoncontrollingInterestDecreaseFromDeconsolidation 6.1us-gaap_NoncontrollingInterestDecreaseFromDeconsolidation 0us-gaap_NoncontrollingInterestDecreaseFromDeconsolidation
Total comprehensive income attributable to OGE Energy $ 382.6us-gaap_ComprehensiveIncomeNetOfTax $ 408.5us-gaap_ComprehensiveIncomeNetOfTax $ 346.5us-gaap_ComprehensiveIncomeNetOfTax