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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) | $ 0 us-gaap_CurrentFederalTaxExpenseBenefit |  | $ 0 us-gaap_CurrentFederalTaxExpenseBenefit |  | $ (9.1)us-gaap_CurrentFederalTaxExpenseBenefit |  |
Current State and Local Tax Expense (Benefit) | (4.5)us-gaap_CurrentStateAndLocalTaxExpenseBenefit |  | 4.3 us-gaap_CurrentStateAndLocalTaxExpenseBenefit |  | 0.5 us-gaap_CurrentStateAndLocalTaxExpenseBenefit |  |
Current Income Tax Expense (Benefit) | (4.5)us-gaap_CurrentIncomeTaxExpenseBenefit |  | 4.3 us-gaap_CurrentIncomeTaxExpenseBenefit |  | (8.6)us-gaap_CurrentIncomeTaxExpenseBenefit |  |
Deferred Federal Income Tax Expense (Benefit) | 160.0 us-gaap_DeferredFederalIncomeTaxExpenseBenefit |  | 154.4 us-gaap_DeferredFederalIncomeTaxExpenseBenefit |  | 147.3 us-gaap_DeferredFederalIncomeTaxExpenseBenefit |  |
Deferred State and Local Income Tax Expense (Benefit) | 18.2 us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit |  | (26.4)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit |  | (1.5)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit |  |
Deferred Income Tax Expense (Benefit) | 178.2 us-gaap_DeferredIncomeTaxExpenseBenefit |  | 128.0 us-gaap_DeferredIncomeTaxExpenseBenefit |  | 145.8 us-gaap_DeferredIncomeTaxExpenseBenefit |  |
Investment Tax Credit | (0.9)us-gaap_InvestmentTaxCredit |  | (2.0)us-gaap_InvestmentTaxCredit |  | (2.1)us-gaap_InvestmentTaxCredit |  |
Income Tax Expense (Benefit) | 172.8 us-gaap_IncomeTaxExpenseBenefit |  | 130.3 us-gaap_IncomeTaxExpenseBenefit |  | 135.1 us-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 | 158.4 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards |  | 180.1 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards |  |  |  |
Accrued liabilities | 15.6 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities |  | 22.3 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities |  |  |  |
Federal tax credits | 12.4 oge_CurrentDeferredTaxAssetsFederalTaxCredits |  | 8.0 oge_CurrentDeferredTaxAssetsFederalTaxCredits |  |  |  |
Accrued vacation | 4.4 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOther |  | 4.7 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOther |  |  |  |
Uncollectible accounts | 0.6 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts |  | 0.7 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts |  |  |  |
Total Current Deferred Income Tax Assets | 191.4 us-gaap_DeferredTaxAssetsGrossCurrent |  | 215.8 us-gaap_DeferredTaxAssetsGrossCurrent |  |  |  |
Accelerated depreciation and other property related differences | 1,936.8 us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment |  | 1,753.3 us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment |  |  |  |
Investment in Enable Midstream Partners | 641.8 oge_NonCurrentDeferredTaxLiabilitiesInvestmentinEnableMidstreamPartners |  | 630.5 oge_NonCurrentDeferredTaxLiabilitiesInvestmentinEnableMidstreamPartners |  |  |  |
Company pension plan | 34.6 us-gaap_DeferredTaxLiabilitiesPrepaidExpenses |  | 55.1 us-gaap_DeferredTaxLiabilitiesPrepaidExpenses |  |  |  |
Income taxes refundable to customers, net | 21.7 oge_DeferredTaxLiabilitiesIncomeTaxesRefundableToCustomersNet |  | 21.9 oge_DeferredTaxLiabilitiesIncomeTaxesRefundableToCustomersNet |  |  |  |
Regulatory asset | 24.7 us-gaap_DeferredTaxLiabilitiesRegulatoryAssets |  | 26.1 us-gaap_DeferredTaxLiabilitiesRegulatoryAssets |  |  |  |
Bond redemption-unamortized costs | 5.3 oge_DeferredTaxLiabilitiesUnamortizedBondRedemptionCosts |  | 3.6 oge_DeferredTaxLiabilitiesUnamortizedBondRedemptionCosts |  |  |  |
Derivative instruments | 1.8 us-gaap_DeferredTaxLiabilitiesDerivatives |  | 1.6 us-gaap_DeferredTaxLiabilitiesDerivatives |  |  |  |
Total Non-Current Deferred Income Tax Liabilities | 2,666.7 us-gaap_DeferredTaxLiabilitiesGrossNoncurrent |  | 2,492.1 us-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 | 2,268.3 us-gaap_DeferredTaxLiabilitiesNoncurrent |  | 2,125.3 us-gaap_DeferredTaxLiabilitiesNoncurrent |  |  |  |
Unrecognized Tax Benefits | 10.5 us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate |  |  |  |  |  |
Unrecognized Tax Benefits | 10.5 us-gaap_UnrecognizedTaxBenefits |  | 7.8 us-gaap_UnrecognizedTaxBenefits |  | 0 us-gaap_UnrecognizedTaxBenefits |  | 0 us-gaap_UnrecognizedTaxBenefits
Current year additions | 2.7 us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions |  | 2.7 us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions |  | 0 us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions |  |
Prior year additions | 0 us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions |  | 5.1 us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions |  | 0 us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions |  |
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued | 0 us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued |  |  |  |  |  |
Unrecognized Tax Benefits, Period Increase (Decrease) | 2.7 us-gaap_UnrecognizedTaxBenefitsPeriodIncreaseDecrease |  |  |  |  |  |
Employee Service Share-based Compensation, Unrecognized Tax Benefit from Compensation Expense | 31.6 oge_EmployeeServiceSharebasedCompensationUnrecognizedTaxBenefitfromCompensationExpense |  |  |  |  |  |
State operating loss [Member] |  |  |  |  |  |  |
Tax Credit Carryforward, Amount | 857.0 us-gaap_TaxCreditCarryforwardAmount / us-gaap_TaxCreditCarryforwardAxis = oge_StateOperatingLossMember |  |  |  |  |  |
Tax Credit Carryforward, Deferred Tax Asset | 31.6 us-gaap_TaxCreditCarryforwardDeferredTaxAsset / us-gaap_TaxCreditCarryforwardAxis = oge_StateOperatingLossMember |  |  |  |  |  |
Tax Credit Carryforward, Expiration Date | Dec. 31, 2030 |  |  |  |  |  |
Federal operating loss [Member] |  |  |  |  |  |  |
Tax Credit Carryforward, Amount | 418.6 us-gaap_TaxCreditCarryforwardAmount / us-gaap_TaxCreditCarryforwardAxis = oge_FederalOperatingLossMemberMember |  |  |  |  |  |
Tax Credit Carryforward, Deferred Tax Asset | 146.6 us-gaap_TaxCreditCarryforwardDeferredTaxAsset / us-gaap_TaxCreditCarryforwardAxis = oge_FederalOperatingLossMemberMember |  |  |  |  |  |
Tax Credit Carryforward, Expiration Date | Dec. 31, 2030 |  |  |  |  |  |
Federal tax credits [Member] |  |  |  |  |  |  |
Tax Credit Carryforward, Amount | 151.5 us-gaap_TaxCreditCarryforwardAmount / us-gaap_TaxCreditCarryforwardAxis = oge_FederalTaxCreditsMemberMember |  |  |  |  |  |
Tax Credit Carryforward, Deferred Tax Asset | 151.4 us-gaap_TaxCreditCarryforwardDeferredTaxAsset / us-gaap_TaxCreditCarryforwardAxis = oge_FederalTaxCreditsMemberMember |  |  |  |  |  |
Tax Credit Carryforward, Expiration Date | Dec. 31, 2029 |  |  |  |  |  |
Oklahoma investment tax credits [Member] |  |  |  |  |  |  |
Tax Credit Carryforward, Amount | 115.3 us-gaap_TaxCreditCarryforwardAmount / us-gaap_TaxCreditCarryforwardAxis = oge_OklahomaInvestmentTaxCreditsMemberMember |  |  |  |  |  |
Tax Credit Carryforward, Deferred Tax Asset | 75.1 us-gaap_TaxCreditCarryforwardDeferredTaxAsset / us-gaap_TaxCreditCarryforwardAxis = oge_OklahomaInvestmentTaxCreditsMemberMember |  |  |  |  |  |
Oklahoma capital investment board credits [Member] |  |  |  |  |  |  |
Tax Credit Carryforward, Amount | 7.3 us-gaap_TaxCreditCarryforwardAmount / us-gaap_TaxCreditCarryforwardAxis = oge_OklahomaCapitalInvestmentBoardCreditsMemberMember |  |  |  |  |  |
Tax Credit Carryforward, Deferred Tax Asset | 7.3 us-gaap_TaxCreditCarryforwardDeferredTaxAsset / us-gaap_TaxCreditCarryforwardAxis = oge_OklahomaCapitalInvestmentBoardCreditsMemberMember |  |  |  |  |  |
Oklahoma zero emission tax credits [Member] |  |  |  |  |  |  |
Tax Credit Carryforward, Amount | 24.3 us-gaap_TaxCreditCarryforwardAmount / us-gaap_TaxCreditCarryforwardAxis = oge_OklahomaZeroEmissionTaxCreditsMemberMember |  |  |  |  |  |
Tax Credit Carryforward, Deferred Tax Asset | 16.2 us-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) | 4.2 us-gaap_UnrecognizedTaxBenefitsPeriodIncreaseDecrease / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember |  |  |  |  |  |
Federal operating loss [Member] |  |  |  |  |  |  |
Net operating losses | $ 158.4 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = oge_FederaloperatinglossMember |  |  |  |  |  |
[1] | Represents credits associated with the production from OG&E's wind farms.

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