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Summary of Significant Accounting Policies, Regulated Operations (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Schedule of Regulatory Assets and Liabilities [Line Items]    
Fuel clause under recoveries $ 27.0us-gaap_DeferredFuelCost $ 68.3us-gaap_DeferredFuelCost
Total Current Regulatory Assets 53.8us-gaap_RegulatoryAssetsCurrent 97.1us-gaap_RegulatoryAssetsCurrent
Total Non-Current Regulatory Assets 406.7us-gaap_RegulatoryAssetsNoncurrent 411.5us-gaap_RegulatoryAssetsNoncurrent
Total Current Regulatory Liabilities 26.2us-gaap_RegulatoryLiabilityCurrent 24.4us-gaap_RegulatoryLiabilityCurrent
Total Non-Current Regulatory Liabilities 271.6us-gaap_RegulatoryLiabilityNoncurrent 263.0us-gaap_RegulatoryLiabilityNoncurrent
Crossroads Wind Farm Rider Over Recovery [Member]    
Schedule of Regulatory Assets and Liabilities [Line Items]    
Total Current Regulatory Liabilities 12.9us-gaap_RegulatoryLiabilityCurrent
/ us-gaap_RegulatoryLiabilityAxis
= oge_CrossroadsWindFarmRiderOverRecoveryMember		 [1] 10.3us-gaap_RegulatoryLiabilityCurrent
/ us-gaap_RegulatoryLiabilityAxis
= oge_CrossroadsWindFarmRiderOverRecoveryMember		 [1]
Smart Grid rider over recovery [Member]    
Schedule of Regulatory Assets and Liabilities [Line Items]    
Total Current Regulatory Liabilities 11.2us-gaap_RegulatoryLiabilityCurrent
/ us-gaap_RegulatoryLiabilityAxis
= oge_SmartGridRiderOverRecoveryMember		 [1] 12.5us-gaap_RegulatoryLiabilityCurrent
/ us-gaap_RegulatoryLiabilityAxis
= oge_SmartGridRiderOverRecoveryMember		 [1]
Other [Member]    
Schedule of Regulatory Assets and Liabilities [Line Items]    
Total Current Regulatory Liabilities 2.1us-gaap_RegulatoryLiabilityCurrent
/ us-gaap_RegulatoryLiabilityAxis
= oge_OtherRegulatoryLiabilitiesMember		 [1] 1.6us-gaap_RegulatoryLiabilityCurrent
/ us-gaap_RegulatoryLiabilityAxis
= oge_OtherRegulatoryLiabilitiesMember		 [1]
Accrued removal obligations, net    
Schedule of Regulatory Assets and Liabilities [Line Items]    
Total Non-Current Regulatory Liabilities 252.3us-gaap_RegulatoryLiabilityNoncurrent
/ us-gaap_RegulatoryLiabilityAxis
= oge_AccruedRemovalObligationsMember		 248.1us-gaap_RegulatoryLiabilityNoncurrent
/ us-gaap_RegulatoryLiabilityAxis
= oge_AccruedRemovalObligationsMember
Pension tracker    
Schedule of Regulatory Assets and Liabilities [Line Items]    
Total Non-Current Regulatory Liabilities 19.3us-gaap_RegulatoryLiabilityNoncurrent
/ us-gaap_RegulatoryLiabilityAxis
= oge_PensionTrackerMember		 14.9us-gaap_RegulatoryLiabilityNoncurrent
/ us-gaap_RegulatoryLiabilityAxis
= oge_PensionTrackerMember
Oklahoma demand program rider under recovery [Member]    
Schedule of Regulatory Assets and Liabilities [Line Items]    
Total Current Regulatory Assets 16.2us-gaap_RegulatoryAssetsCurrent
/ us-gaap_RegulatoryAssetAxis
= oge_OklahomaDemandProgramRiderUnderRecoveryMember		 [2] 19.7us-gaap_RegulatoryAssetsCurrent
/ us-gaap_RegulatoryAssetAxis
= oge_OklahomaDemandProgramRiderUnderRecoveryMember		 [2]
Other [Member]    
Schedule of Regulatory Assets and Liabilities [Line Items]    
Total Current Regulatory Assets 10.6us-gaap_RegulatoryAssetsCurrent
/ us-gaap_RegulatoryAssetAxis
= oge_OtherRegulatoryAssetsMember		 [2] 9.1us-gaap_RegulatoryAssetsCurrent
/ us-gaap_RegulatoryAssetAxis
= oge_OtherRegulatoryAssetsMember		 [2]
Total Non-Current Regulatory Assets 16.2us-gaap_RegulatoryAssetsNoncurrent
/ us-gaap_RegulatoryAssetAxis
= oge_OtherRegulatoryAssetsMember		 16.8us-gaap_RegulatoryAssetsNoncurrent
/ us-gaap_RegulatoryAssetAxis
= oge_OtherRegulatoryAssetsMember
Benefit obligations regulatory asset    
Schedule of Regulatory Assets and Liabilities [Line Items]    
Total Non-Current Regulatory Assets 258.2us-gaap_RegulatoryAssetsNoncurrent
/ us-gaap_RegulatoryAssetAxis
= oge_BenefitObligationsMember		 261.1us-gaap_RegulatoryAssetsNoncurrent
/ us-gaap_RegulatoryAssetAxis
= oge_BenefitObligationsMember
Income taxes recoverable from customers, net    
Schedule of Regulatory Assets and Liabilities [Line Items]    
Total Non-Current Regulatory Assets 56.2us-gaap_RegulatoryAssetsNoncurrent
/ us-gaap_RegulatoryAssetAxis
= oge_IncomeTaxesRecoverableFromCustomersNetMember		 56.1us-gaap_RegulatoryAssetsNoncurrent
/ us-gaap_RegulatoryAssetAxis
= oge_IncomeTaxesRecoverableFromCustomersNetMember
Smart Grid    
Schedule of Regulatory Assets and Liabilities [Line Items]    
Total Non-Current Regulatory Assets 43.8us-gaap_RegulatoryAssetsNoncurrent
/ us-gaap_RegulatoryAssetAxis
= oge_SmartGridMember		 43.9us-gaap_RegulatoryAssetsNoncurrent
/ us-gaap_RegulatoryAssetAxis
= oge_SmartGridMember
Deferred storm expenses    
Schedule of Regulatory Assets and Liabilities [Line Items]    
Total Non-Current Regulatory Assets 16.5us-gaap_RegulatoryAssetsNoncurrent
/ us-gaap_RegulatoryAssetAxis
= oge_DeferredStormExpensesMember		 17.5us-gaap_RegulatoryAssetsNoncurrent
/ us-gaap_RegulatoryAssetAxis
= oge_DeferredStormExpensesMember
Unamortized loss on reacquired debt    
Schedule of Regulatory Assets and Liabilities [Line Items]    
Total Non-Current Regulatory Assets $ 15.8us-gaap_RegulatoryAssetsNoncurrent
/ us-gaap_RegulatoryAssetAxis
= us-gaap_LossOnReacquiredDebtMember		 $ 16.1us-gaap_RegulatoryAssetsNoncurrent
/ us-gaap_RegulatoryAssetAxis
= us-gaap_LossOnReacquiredDebtMember
[1] Included in Other Current Liabilities on the Condensed Consolidated Balance Sheets.
[2] Included in Other Current Assets on the Condensed Consolidated Balance Sheets.