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Summary of Significant Accounting Policies Accounting Records (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Components of Benefit Obligation Regulatory Asset | $ 261.1 oge_ComponentsOfBenefitObligationRegulatoryAsset | $ 227.4 oge_ComponentsOfBenefitObligationRegulatoryAsset
Components of Net Periodic Benefit Costs to be Recognized in Next Fiscal Year | (4.1)oge_ComponentsOfNetPeriodicBenefitCostsToBeRecognizedInNextFiscalYear |
Deferred Storm and Property Reserve Deficiency, Current | 2.7 us-gaap_DeferredStormAndPropertyReserveDeficiencyCurrent |
Smart Grid Project [Member] |  |
Smart Grid Costs to be Recovered | 6.9 oge_SmartGridCostsToBeRecovered / oge_SmartGridCapitalCostsAxis = oge_SmartGridProjectMember |
Regulatory Asset [Member] |  |
Components of Net Periodic Benefit Costs to be Recognized in Next Fiscal Year | 11.3 oge_ComponentsOfNetPeriodicBenefitCostsToBeRecognizedInNextFiscalYear / us-gaap_RegulatoryAssetAxis = oge_RegulatoryAssetMember |
Pension Plans, Defined Benefit [Member] | Defined Benefit Plans Income Loss [Member] |  |
Components of Benefit Obligation Regulatory Asset | 196.7 oge_ComponentsOfBenefitObligationRegulatoryAsset / oge_ComponentsOfBenefitObligationRegulatoryAssetAxis = oge_DefinedBenefitPlansIncomeLossMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_PensionPlansDefinedBenefitMember | 178.4 oge_ComponentsOfBenefitObligationRegulatoryAsset / oge_ComponentsOfBenefitObligationRegulatoryAssetAxis = oge_DefinedBenefitPlansIncomeLossMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_PensionPlansDefinedBenefitMember
Components of Net Periodic Benefit Costs to be Recognized in Next Fiscal Year | 12.7 oge_ComponentsOfNetPeriodicBenefitCostsToBeRecognizedInNextFiscalYear / oge_ComponentsOfBenefitObligationRegulatoryAssetAxis = oge_DefinedBenefitPlansIncomeLossMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_PensionPlansDefinedBenefitMember |
Pension Plans, Defined Benefit [Member] | Prior Service Cost [Member] |  |
Components of Benefit Obligation Regulatory Asset | 0.6 oge_ComponentsOfBenefitObligationRegulatoryAsset / oge_ComponentsOfBenefitObligationRegulatoryAssetAxis = oge_PriorServiceCostMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_PensionPlansDefinedBenefitMember | 2.5 oge_ComponentsOfBenefitObligationRegulatoryAsset / oge_ComponentsOfBenefitObligationRegulatoryAssetAxis = oge_PriorServiceCostMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_PensionPlansDefinedBenefitMember
Components of Net Periodic Benefit Costs to be Recognized in Next Fiscal Year | 0.5 oge_ComponentsOfNetPeriodicBenefitCostsToBeRecognizedInNextFiscalYear / oge_ComponentsOfBenefitObligationRegulatoryAssetAxis = oge_PriorServiceCostMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_PensionPlansDefinedBenefitMember |
Other Postretirement Benefit Plans, Defined Benefit [Member] | Defined Benefit Plans Income Loss [Member] |  |
Components of Benefit Obligation Regulatory Asset | 83.6 oge_ComponentsOfBenefitObligationRegulatoryAsset / oge_ComponentsOfBenefitObligationRegulatoryAssetAxis = oge_DefinedBenefitPlansIncomeLossMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember | 79.9 oge_ComponentsOfBenefitObligationRegulatoryAsset / oge_ComponentsOfBenefitObligationRegulatoryAssetAxis = oge_DefinedBenefitPlansIncomeLossMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember
Components of Net Periodic Benefit Costs to be Recognized in Next Fiscal Year | 11.8 oge_ComponentsOfNetPeriodicBenefitCostsToBeRecognizedInNextFiscalYear / oge_ComponentsOfBenefitObligationRegulatoryAssetAxis = oge_DefinedBenefitPlansIncomeLossMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember |
Other Postretirement Benefit Plans, Defined Benefit [Member] | Prior Service Cost [Member] |  |
Components of Benefit Obligation Regulatory Asset | (19.8)oge_ComponentsOfBenefitObligationRegulatoryAsset / oge_ComponentsOfBenefitObligationRegulatoryAssetAxis = oge_PriorServiceCostMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember | (33.4)oge_ComponentsOfBenefitObligationRegulatoryAsset / oge_ComponentsOfBenefitObligationRegulatoryAssetAxis = oge_PriorServiceCostMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember
Components of Net Periodic Benefit Costs to be Recognized in Next Fiscal Year | $ (13.7)oge_ComponentsOfNetPeriodicBenefitCostsToBeRecognizedInNextFiscalYear / oge_ComponentsOfBenefitObligationRegulatoryAssetAxis = oge_PriorServiceCostMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember |

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- Definition Components of Benefit Obligation Regulatory Asset + References No definition available. + Details
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- Definition Components of Net Periodic Benefit Costs to be Recognized in Next Fiscal Year + References No definition available. + Details
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- Definition Smart grid costs to be recovered through a rider + References No definition available. + Details
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Balance Type: | debit
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- Definition Carrying amount as of the balance sheet date of capitalized storm costs of a regulated entity that are expected to be recoverable through rate adjustments within one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 340 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6499739&loc=d3e43603-110378 + Details
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