XML 93 R49.htm IDEA: XBRL DOCUMENT v2.4.1.9
Summary of Significant Accounting Policies Property, Plant and Equipment (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Gross $ 10,098.9us-gaap_PropertyPlantAndEquipmentGross $ 9,651.6us-gaap_PropertyPlantAndEquipmentGross  
Accumulated Depreciation 3,119.0us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment 2,978.8us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment  
Net property, plant and equipment 6,979.9us-gaap_PropertyPlantAndEquipmentNet 6,672.8us-gaap_PropertyPlantAndEquipmentNet  
Capitalized Computer Software, Gross 38.1us-gaap_CapitalizedComputerSoftwareNet 24.0us-gaap_CapitalizedComputerSoftwareNet  
Capitalized Computer Software, Amortization 9.5us-gaap_CapitalizedComputerSoftwareAmortization 11.2us-gaap_CapitalizedComputerSoftwareAmortization 14.1us-gaap_CapitalizedComputerSoftwareAmortization
McClain Plant [Member]      
Property, Plant and Equipment [Line Items]      
Jointly Owned Utility Plant, Proportionate Ownership Share 77.00%us-gaap_JointlyOwnedUtilityPlantProportionateOwnershipShare
/ us-gaap_JointlyOwnedUtilityPlantAxis
= oge_McclainPlantMember
[1] 77.00%us-gaap_JointlyOwnedUtilityPlantProportionateOwnershipShare
/ us-gaap_JointlyOwnedUtilityPlantAxis
= oge_McclainPlantMember
[2]  
Property, Plant and Equipment, Gross 207.7us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_JointlyOwnedUtilityPlantAxis
= oge_McclainPlantMember
[1] 183.2us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_JointlyOwnedUtilityPlantAxis
= oge_McclainPlantMember
[2]  
Accumulated Depreciation 46.6us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
/ us-gaap_JointlyOwnedUtilityPlantAxis
= oge_McclainPlantMember
[1] 62.8us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
/ us-gaap_JointlyOwnedUtilityPlantAxis
= oge_McclainPlantMember
[2]  
Net property, plant and equipment 161.1us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_JointlyOwnedUtilityPlantAxis
= oge_McclainPlantMember
[1] 120.4us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_JointlyOwnedUtilityPlantAxis
= oge_McclainPlantMember
[2]  
Jointly Owned Utility Plant, Ownership Amount of Construction Work in Progress 0.5us-gaap_JointlyOwnedUtilityPlantOwnershipAmountOfConstructionWorkInProgress
/ us-gaap_JointlyOwnedUtilityPlantAxis
= oge_McclainPlantMember
0.1us-gaap_JointlyOwnedUtilityPlantOwnershipAmountOfConstructionWorkInProgress
/ us-gaap_JointlyOwnedUtilityPlantAxis
= oge_McclainPlantMember
 
Redbud Plant [Member]      
Property, Plant and Equipment [Line Items]      
Jointly Owned Utility Plant, Proportionate Ownership Share 51.00%us-gaap_JointlyOwnedUtilityPlantProportionateOwnershipShare
/ us-gaap_JointlyOwnedUtilityPlantAxis
= oge_RedbudPlantMember
[1],[3] 51.00%us-gaap_JointlyOwnedUtilityPlantProportionateOwnershipShare
/ us-gaap_JointlyOwnedUtilityPlantAxis
= oge_RedbudPlantMember
[2],[4]  
Property, Plant and Equipment, Gross 484.1us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_JointlyOwnedUtilityPlantAxis
= oge_RedbudPlantMember
[1],[3] 498.9us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_JointlyOwnedUtilityPlantAxis
= oge_RedbudPlantMember
[2],[4]  
Accumulated Depreciation 81.8us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
/ us-gaap_JointlyOwnedUtilityPlantAxis
= oge_RedbudPlantMember
[1],[3] 89.7us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
/ us-gaap_JointlyOwnedUtilityPlantAxis
= oge_RedbudPlantMember
[2],[4]  
Net property, plant and equipment 402.3us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_JointlyOwnedUtilityPlantAxis
= oge_RedbudPlantMember
[1],[3] 409.2us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_JointlyOwnedUtilityPlantAxis
= oge_RedbudPlantMember
[2],[4]  
Jointly Owned Utility Plant, Ownership Amount of Construction Work in Progress 0.4us-gaap_JointlyOwnedUtilityPlantOwnershipAmountOfConstructionWorkInProgress
/ us-gaap_JointlyOwnedUtilityPlantAxis
= oge_RedbudPlantMember
39.5us-gaap_JointlyOwnedUtilityPlantOwnershipAmountOfConstructionWorkInProgress
/ us-gaap_JointlyOwnedUtilityPlantAxis
= oge_RedbudPlantMember
 
Amount of Acquisition Adjustments 148.3us-gaap_PublicUtilitiesPropertyPlantAndEquipmentAmountOfAcquisitionAdjustments1
/ us-gaap_JointlyOwnedUtilityPlantAxis
= oge_RedbudPlantMember
148.3us-gaap_PublicUtilitiesPropertyPlantAndEquipmentAmountOfAcquisitionAdjustments1
/ us-gaap_JointlyOwnedUtilityPlantAxis
= oge_RedbudPlantMember
 
Public Utilities, Property, Plant and Equipment, Amount of Acquisition Adjustments, Related Accumulated Depreciation 34.3us-gaap_PublicUtilitiesPropertyPlantAndEquipmentAmountOfAcquisitionAdjustmentsRelatedAccumulatedDepreciation1
/ us-gaap_JointlyOwnedUtilityPlantAxis
= oge_RedbudPlantMember
28.8us-gaap_PublicUtilitiesPropertyPlantAndEquipmentAmountOfAcquisitionAdjustmentsRelatedAccumulatedDepreciation1
/ us-gaap_JointlyOwnedUtilityPlantAxis
= oge_RedbudPlantMember
 
OGE Energy [Member]      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Gross 151.7us-gaap_PropertyPlantAndEquipmentGross
/ dei_LegalEntityAxis
= oge_OgeEnergyMember
152.4us-gaap_PropertyPlantAndEquipmentGross
/ dei_LegalEntityAxis
= oge_OgeEnergyMember
 
Accumulated Depreciation 113.3us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
/ dei_LegalEntityAxis
= oge_OgeEnergyMember
114.2us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
/ dei_LegalEntityAxis
= oge_OgeEnergyMember
 
Net property, plant and equipment 38.4us-gaap_PropertyPlantAndEquipmentNet
/ dei_LegalEntityAxis
= oge_OgeEnergyMember
38.2us-gaap_PropertyPlantAndEquipmentNet
/ dei_LegalEntityAxis
= oge_OgeEnergyMember
 
Capitalized Computer Software, Gross 4.5us-gaap_CapitalizedComputerSoftwareNet
/ dei_LegalEntityAxis
= oge_OgeEnergyMember
7.2us-gaap_CapitalizedComputerSoftwareNet
/ dei_LegalEntityAxis
= oge_OgeEnergyMember
 
Capitalized Computer Software, Amortization 4.3us-gaap_CapitalizedComputerSoftwareAmortization
/ dei_LegalEntityAxis
= oge_OgeEnergyMember
6.4us-gaap_CapitalizedComputerSoftwareAmortization
/ dei_LegalEntityAxis
= oge_OgeEnergyMember
6.8us-gaap_CapitalizedComputerSoftwareAmortization
/ dei_LegalEntityAxis
= oge_OgeEnergyMember
OGE Energy [Member] | Total Property Plant and Equipment [Member]      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Gross 151.7us-gaap_PropertyPlantAndEquipmentGross
/ dei_LegalEntityAxis
= oge_OgeEnergyMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= oge_TotalPropertyPlantAndEquipmentMember
152.4us-gaap_PropertyPlantAndEquipmentGross
/ dei_LegalEntityAxis
= oge_OgeEnergyMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= oge_TotalPropertyPlantAndEquipmentMember
 
Accumulated Depreciation 113.3us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
/ dei_LegalEntityAxis
= oge_OgeEnergyMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= oge_TotalPropertyPlantAndEquipmentMember
114.2us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
/ dei_LegalEntityAxis
= oge_OgeEnergyMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= oge_TotalPropertyPlantAndEquipmentMember
 
Net property, plant and equipment 38.4us-gaap_PropertyPlantAndEquipmentNet
/ dei_LegalEntityAxis
= oge_OgeEnergyMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= oge_TotalPropertyPlantAndEquipmentMember
38.2us-gaap_PropertyPlantAndEquipmentNet
/ dei_LegalEntityAxis
= oge_OgeEnergyMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= oge_TotalPropertyPlantAndEquipmentMember
 
Og and E [Member]      
Property, Plant and Equipment [Line Items]      
Capitalized Computer Software, Gross 33.6us-gaap_CapitalizedComputerSoftwareNet
/ dei_LegalEntityAxis
= oge_OgAndEMember
16.8us-gaap_CapitalizedComputerSoftwareNet
/ dei_LegalEntityAxis
= oge_OgAndEMember
 
Capitalized Computer Software, Amortization 5.2us-gaap_CapitalizedComputerSoftwareAmortization
/ dei_LegalEntityAxis
= oge_OgAndEMember
4.0us-gaap_CapitalizedComputerSoftwareAmortization
/ dei_LegalEntityAxis
= oge_OgAndEMember
4.2us-gaap_CapitalizedComputerSoftwareAmortization
/ dei_LegalEntityAxis
= oge_OgAndEMember
Og and E [Member] | Total Property Plant and Equipment [Member]      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Gross 9,947.2us-gaap_PropertyPlantAndEquipmentGross
/ dei_LegalEntityAxis
= oge_OgAndEMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= oge_TotalPropertyPlantAndEquipmentMember
9,499.2us-gaap_PropertyPlantAndEquipmentGross
/ dei_LegalEntityAxis
= oge_OgAndEMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= oge_TotalPropertyPlantAndEquipmentMember
 
Accumulated Depreciation 3,005.7us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
/ dei_LegalEntityAxis
= oge_OgAndEMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= oge_TotalPropertyPlantAndEquipmentMember
2,864.6us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
/ dei_LegalEntityAxis
= oge_OgAndEMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= oge_TotalPropertyPlantAndEquipmentMember
 
Net property, plant and equipment 6,941.5us-gaap_PropertyPlantAndEquipmentNet
/ dei_LegalEntityAxis
= oge_OgAndEMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= oge_TotalPropertyPlantAndEquipmentMember
6,634.6us-gaap_PropertyPlantAndEquipmentNet
/ dei_LegalEntityAxis
= oge_OgAndEMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= oge_TotalPropertyPlantAndEquipmentMember
 
Og and E [Member] | Electric Transmission and Distribution [Member]      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Gross 3,559.5us-gaap_PropertyPlantAndEquipmentGross
/ dei_LegalEntityAxis
= oge_OgAndEMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ElectricTransmissionAndDistributionMember
3,403.8us-gaap_PropertyPlantAndEquipmentGross
/ dei_LegalEntityAxis
= oge_OgAndEMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ElectricTransmissionAndDistributionMember
 
Accumulated Depreciation 1,086.7us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
/ dei_LegalEntityAxis
= oge_OgAndEMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ElectricTransmissionAndDistributionMember
1,028.2us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
/ dei_LegalEntityAxis
= oge_OgAndEMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ElectricTransmissionAndDistributionMember
 
Net property, plant and equipment 2,472.8us-gaap_PropertyPlantAndEquipmentNet
/ dei_LegalEntityAxis
= oge_OgAndEMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ElectricTransmissionAndDistributionMember
2,375.6us-gaap_PropertyPlantAndEquipmentNet
/ dei_LegalEntityAxis
= oge_OgAndEMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ElectricTransmissionAndDistributionMember
 
Og and E [Member] | Electric Generation Equipment [Member]      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Gross 3,620.1us-gaap_PropertyPlantAndEquipmentGross
/ dei_LegalEntityAxis
= oge_OgAndEMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ElectricGenerationEquipmentMember
[5] 3,551.0us-gaap_PropertyPlantAndEquipmentGross
/ dei_LegalEntityAxis
= oge_OgAndEMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ElectricGenerationEquipmentMember
[6]  
Accumulated Depreciation 1,345.1us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
/ dei_LegalEntityAxis
= oge_OgAndEMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ElectricGenerationEquipmentMember
[5] 1,306.1us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
/ dei_LegalEntityAxis
= oge_OgAndEMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ElectricGenerationEquipmentMember
[6]  
Net property, plant and equipment 2,275.0us-gaap_PropertyPlantAndEquipmentNet
/ dei_LegalEntityAxis
= oge_OgAndEMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ElectricGenerationEquipmentMember
[5] 2,244.9us-gaap_PropertyPlantAndEquipmentNet
/ dei_LegalEntityAxis
= oge_OgAndEMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ElectricGenerationEquipmentMember
[6]  
Amount of Acquisition Adjustments 148.3us-gaap_PublicUtilitiesPropertyPlantAndEquipmentAmountOfAcquisitionAdjustments1
/ dei_LegalEntityAxis
= oge_OgAndEMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ElectricGenerationEquipmentMember
148.3us-gaap_PublicUtilitiesPropertyPlantAndEquipmentAmountOfAcquisitionAdjustments1
/ dei_LegalEntityAxis
= oge_OgAndEMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ElectricGenerationEquipmentMember
 
Public Utilities, Property, Plant and Equipment, Amount of Acquisition Adjustments, Related Accumulated Depreciation 34.3us-gaap_PublicUtilitiesPropertyPlantAndEquipmentAmountOfAcquisitionAdjustmentsRelatedAccumulatedDepreciation1
/ dei_LegalEntityAxis
= oge_OgAndEMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ElectricGenerationEquipmentMember
28.8us-gaap_PublicUtilitiesPropertyPlantAndEquipmentAmountOfAcquisitionAdjustmentsRelatedAccumulatedDepreciation1
/ dei_LegalEntityAxis
= oge_OgAndEMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ElectricGenerationEquipmentMember
 
Og and E [Member] | Electric Transmission [Member]      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Gross 2,370.0us-gaap_PropertyPlantAndEquipmentGross
/ dei_LegalEntityAxis
= oge_OgAndEMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ElectricTransmissionMember
[7] 2,163.7us-gaap_PropertyPlantAndEquipmentGross
/ dei_LegalEntityAxis
= oge_OgAndEMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ElectricTransmissionMember
[8]  
Accumulated Depreciation 417.8us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
/ dei_LegalEntityAxis
= oge_OgAndEMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ElectricTransmissionMember
[7] 385.0us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
/ dei_LegalEntityAxis
= oge_OgAndEMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ElectricTransmissionMember
[8]  
Net property, plant and equipment 1,952.2us-gaap_PropertyPlantAndEquipmentNet
/ dei_LegalEntityAxis
= oge_OgAndEMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ElectricTransmissionMember
[7] 1,778.7us-gaap_PropertyPlantAndEquipmentNet
/ dei_LegalEntityAxis
= oge_OgAndEMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ElectricTransmissionMember
[8]  
Amount of Acquisition Adjustments 3.3us-gaap_PublicUtilitiesPropertyPlantAndEquipmentAmountOfAcquisitionAdjustments1
/ dei_LegalEntityAxis
= oge_OgAndEMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ElectricTransmissionMember
3.3us-gaap_PublicUtilitiesPropertyPlantAndEquipmentAmountOfAcquisitionAdjustments1
/ dei_LegalEntityAxis
= oge_OgAndEMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ElectricTransmissionMember
 
Amount of Acquistion Adjustments Related Accumulated Amortization 0.4oge_AmountOfAcquistionAdjustmentsRelatedAccumulatedAmortization
/ dei_LegalEntityAxis
= oge_OgAndEMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ElectricTransmissionMember
0.3oge_AmountOfAcquistionAdjustmentsRelatedAccumulatedAmortization
/ dei_LegalEntityAxis
= oge_OgAndEMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ElectricTransmissionMember
 
Og and E [Member] | Finite-Lived Intangible Assets, Major Class Name [Member]      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Gross 67.6us-gaap_PropertyPlantAndEquipmentGross
/ dei_LegalEntityAxis
= oge_OgAndEMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= oge_FiniteLivedIntangibleAssetsMajorClassNameMember
50.5us-gaap_PropertyPlantAndEquipmentGross
/ dei_LegalEntityAxis
= oge_OgAndEMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= oge_FiniteLivedIntangibleAssetsMajorClassNameMember
 
Accumulated Depreciation 31.1us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
/ dei_LegalEntityAxis
= oge_OgAndEMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= oge_FiniteLivedIntangibleAssetsMajorClassNameMember
27.1us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
/ dei_LegalEntityAxis
= oge_OgAndEMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= oge_FiniteLivedIntangibleAssetsMajorClassNameMember
 
Net property, plant and equipment 36.5us-gaap_PropertyPlantAndEquipmentNet
/ dei_LegalEntityAxis
= oge_OgAndEMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= oge_FiniteLivedIntangibleAssetsMajorClassNameMember
23.4us-gaap_PropertyPlantAndEquipmentNet
/ dei_LegalEntityAxis
= oge_OgAndEMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= oge_FiniteLivedIntangibleAssetsMajorClassNameMember
 
Og and E [Member] | Property, Plant and Equipment, Other Types [Member]      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Gross 330.0us-gaap_PropertyPlantAndEquipmentGross
/ dei_LegalEntityAxis
= oge_OgAndEMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_PropertyPlantAndEquipmentOtherTypesMember
330.2us-gaap_PropertyPlantAndEquipmentGross
/ dei_LegalEntityAxis
= oge_OgAndEMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_PropertyPlantAndEquipmentOtherTypesMember
 
Accumulated Depreciation 125.0us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
/ dei_LegalEntityAxis
= oge_OgAndEMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_PropertyPlantAndEquipmentOtherTypesMember
118.2us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
/ dei_LegalEntityAxis
= oge_OgAndEMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_PropertyPlantAndEquipmentOtherTypesMember
 
Net property, plant and equipment 205.0us-gaap_PropertyPlantAndEquipmentNet
/ dei_LegalEntityAxis
= oge_OgAndEMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_PropertyPlantAndEquipmentOtherTypesMember
212.0us-gaap_PropertyPlantAndEquipmentNet
/ dei_LegalEntityAxis
= oge_OgAndEMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_PropertyPlantAndEquipmentOtherTypesMember
 
Enogex [Member]      
Property, Plant and Equipment [Line Items]      
Capitalized Computer Software, Amortization $ 0us-gaap_CapitalizedComputerSoftwareAmortization
/ dei_LegalEntityAxis
= oge_EnogexMember
$ 0.8us-gaap_CapitalizedComputerSoftwareAmortization
/ dei_LegalEntityAxis
= oge_EnogexMember
$ 3.1us-gaap_CapitalizedComputerSoftwareAmortization
/ dei_LegalEntityAxis
= oge_EnogexMember
[1] Construction work in progress was $0.5 million and $0.4 million for the McClain and Redbud Plants, respectively.
[2] Construction work in progress was $0.1 million and $39.5 million for the McClain and Redbud Plants, respectively.
[3] This amount includes a plant acquisition adjustment of $148.3 million and accumulated amortization of $34.3 million.
[4] This amount includes a plant acquisition adjustment of $148.3 million and accumulated amortization of $28.8 million.
[5] This amount includes a plant acquisition adjustment of $148.3 million and accumulated amortization of $34.3 million.
[6] This amount includes a plant acquisition adjustment of $148.3 million and accumulated amortization of $28.8 million.
[7] This amount includes a plant acquisition adjustment of $3.3 million and accumulated amortization of $0.4 million.
[8] This amount includes a plant acquisition adjustment of $3.3 million and accumulated amortization of $0.3 million.