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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 | $ 395.8 us-gaap_ProfitLoss | $ 393.8 us-gaap_ProfitLoss | $ 385.0 us-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 | 1.8 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax | 3.7 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax | 3.0 us-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 | 12.4 us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax | (10.2)us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax
Amortization of prior service cost, net of tax of $0, $0 and $0.2, respectively | 0 us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax | 0 us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax | 0.2 us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax
Settlement (Curtailment) cost, net of tax of ($0.1), $1.9 and $0, respectively | (0.1)us-gaap_OtherComprehensiveIncomeLossFinalizationOfPensionAndNonPensionPostretirementPlanValuationNetOfTax | 3.0 us-gaap_OtherComprehensiveIncomeLossFinalizationOfPensionAndNonPensionPostretirementPlanValuationNetOfTax | 0 us-gaap_OtherComprehensiveIncomeLossFinalizationOfPensionAndNonPensionPostretirementPlanValuationNetOfTax
Postretirement Benefit Plans: |  |  |
Amortization of deferred net loss, net of tax of $0.5, $1.3 and ($1.1), respectively | 0.9 oge_OtherComprehensiveIncomeReclassificationOfDefinedBenefitPostretirementPlansNetGainLossRecognizedInNetPeriodicBenefitCostNetOfTax | 2.0 oge_OtherComprehensiveIncomeReclassificationOfDefinedBenefitPostretirementPlansNetGainLossRecognizedInNetPeriodicBenefitCostNetOfTax | 2.0 oge_OtherComprehensiveIncomeReclassificationOfDefinedBenefitPostretirementPlansNetGainLossRecognizedInNetPeriodicBenefitCostNetOfTax
Net gain (loss) arising during the period, net of tax of ($1.9), $4.4 and ($1.1), respectively | (3.1)oge_OtherComprehensiveIncomePostretirementPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax | 6.9 oge_OtherComprehensiveIncomePostretirementPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax | (2.3)oge_OtherComprehensiveIncomePostretirementPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax
Amortization of deferred net transition obligation, net of tax of $0, $0 and $0.1, respectively | 0 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetTransitionAssetObligationNetOfTax | 0 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetTransitionAssetObligationNetOfTax | 0.1 us-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 | 0 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax | 0.6 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax | (3.6)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax
Deferred commodity contracts hedging gains (losses), net of tax of $0, $0 and $0.1, respectively | 0 us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax | 0 us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax | 0.4 us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax
Amortization of deferred interest rate swap hedging losses, net of tax of $0.1, $0.1 and $0.2, respectively | 0.2 oge_OtherComprehensiveIncomeAmortizationOfInterestRateSwapNetOfTax | 0.3 oge_OtherComprehensiveIncomeAmortizationOfInterestRateSwapNetOfTax | 0.2 oge_OtherComprehensiveIncomeAmortizationOfInterestRateSwapNetOfTax
Other comprehensive income, net of tax | (13.2)us-gaap_OtherComprehensiveIncomeLossNetOfTax | 27.1 us-gaap_OtherComprehensiveIncomeLossNetOfTax | (12.0)us-gaap_OtherComprehensiveIncomeLossNetOfTax
Comprehensive income | 382.6 us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest | 420.9 us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest | 373.0 us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest
Less: Comprehensive income attributable to noncontrolling interests | 0 us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest | 6.3 us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest | 26.5 us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest
Less: Deconsolidation of Enogex Holdings | 0 us-gaap_NoncontrollingInterestDecreaseFromDeconsolidation | 6.1 us-gaap_NoncontrollingInterestDecreaseFromDeconsolidation | 0 us-gaap_NoncontrollingInterestDecreaseFromDeconsolidation
Total comprehensive income attributable to OGE Energy | $ 382.6 us-gaap_ComprehensiveIncomeNetOfTax | $ 408.5 us-gaap_ComprehensiveIncomeNetOfTax | $ 346.5 us-gaap_ComprehensiveIncomeNetOfTax

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