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Fair Value Measurements Carrying and Fair Value Amounts (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total long-term debt $ 2,755.3us-gaap_LongTermDebt $ 2,400.1us-gaap_LongTermDebt
OG&E Senior Notes [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total long-term debt 2,509.7us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= oge_OgAndESeniorNotesMember
2,154.5us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= oge_OgAndESeniorNotesMember
Long-Term Debt, Fair Value 2,957.7us-gaap_LongTermDebtFairValue
/ us-gaap_DebtInstrumentAxis
= oge_OgAndESeniorNotesMember
2,405.0us-gaap_LongTermDebtFairValue
/ us-gaap_DebtInstrumentAxis
= oge_OgAndESeniorNotesMember
OG&E Industrial Authority Bonds [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total long-term debt 135.4us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= oge_OgAndEIndustrialAuthorityBondsMember
135.4us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= oge_OgAndEIndustrialAuthorityBondsMember
Long-Term Debt, Fair Value 135.4us-gaap_LongTermDebtFairValue
/ us-gaap_DebtInstrumentAxis
= oge_OgAndEIndustrialAuthorityBondsMember
135.4us-gaap_LongTermDebtFairValue
/ us-gaap_DebtInstrumentAxis
= oge_OgAndEIndustrialAuthorityBondsMember
OG&E Tinker Debt [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total long-term debt 10.2us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= oge_OgAndETinkerDebtMember
10.3us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= oge_OgAndETinkerDebtMember
Long-Term Debt, Fair Value 10.3us-gaap_LongTermDebtFairValue
/ us-gaap_DebtInstrumentAxis
= oge_OgAndETinkerDebtMember
9.1us-gaap_LongTermDebtFairValue
/ us-gaap_DebtInstrumentAxis
= oge_OgAndETinkerDebtMember
OGE Energy Senior Notes [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total long-term debt 100.0us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= oge_OgeEnergySeniorNotesMember
99.9us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= oge_OgeEnergySeniorNotesMember
Long-Term Debt, Fair Value 99.9us-gaap_LongTermDebtFairValue
/ us-gaap_DebtInstrumentAxis
= oge_OgeEnergySeniorNotesMember
103.1us-gaap_LongTermDebtFairValue
/ us-gaap_DebtInstrumentAxis
= oge_OgeEnergySeniorNotesMember
Fair Value, Measurements, Recurring [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Derivative Assets (Liabilities), at Fair Value, Net $ 0us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
$ 0us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember