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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Net income $ 43.2us-gaap_ProfitLoss $ 49.3us-gaap_ProfitLoss
Pension Plan and Restoration of Retirement Income Plan:    
Amortization of deferred net loss, net of tax of $0.8 and $0.3, respectively 0.4us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax 0.4us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax
Postretirement Benefit Plans:    
Amortization of deferred net loss, net of tax of $0.2 and $0.1, respectively 0.2oge_OtherComprehensiveIncomeReclassificationOfDefinedBenefitPostretirementPlansNetGainLossRecognizedInNetPeriodicBenefitCostNetOfTax 0.2oge_OtherComprehensiveIncomeReclassificationOfDefinedBenefitPostretirementPlansNetGainLossRecognizedInNetPeriodicBenefitCostNetOfTax
Amortization of prior service cost, net of tax of ($0.3) and ($0.3), respectively (0.4)oge_OtherComprehensiveIncomeAmortizationOfDefinedBenefitPostretirementPlansNetPriorServiceCostRecognizedInNetPeriodicPostretirementCostNetOfTax (0.4)oge_OtherComprehensiveIncomeAmortizationOfDefinedBenefitPostretirementPlansNetPriorServiceCostRecognizedInNetPeriodicPostretirementCostNetOfTax
Amortization of deferred interest rate swap hedging losses, net of tax of $0.0 and $0.1, respectively 0oge_OtherComprehensiveIncomeAmortizationOfInterestRateSwapNetOfTax 0.1oge_OtherComprehensiveIncomeAmortizationOfInterestRateSwapNetOfTax
Other comprehensive income, net of tax 0.2us-gaap_OtherComprehensiveIncomeLossNetOfTax 0.3us-gaap_OtherComprehensiveIncomeLossNetOfTax
Comprehensive income $ 43.4us-gaap_ComprehensiveIncomeNetOfTax $ 49.6us-gaap_ComprehensiveIncomeNetOfTax