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Fair Value Measurements Carrying and Fair Value Amounts (Details) (USD $) In Millions, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014
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OG&E Senior Notes [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Long-Term Debt, Carrying Amount | $ 2,509.8 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = oge_OgAndESeniorNotesMember | $ 2,509.7 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = oge_OgAndESeniorNotesMember
Long-Term Debt, Fair Value | 3,000.5 us-gaap_LongTermDebtFairValue / us-gaap_DebtInstrumentAxis = oge_OgAndESeniorNotesMember | 2,957.7 us-gaap_LongTermDebtFairValue / us-gaap_DebtInstrumentAxis = oge_OgAndESeniorNotesMember
OG&E Industrial Authority Bonds [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Long-Term Debt, Carrying Amount | 135.4 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = oge_OgAndEIndustrialAuthorityBondsMember | 135.4 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = oge_OgAndEIndustrialAuthorityBondsMember
Long-Term Debt, Fair Value | 135.4 us-gaap_LongTermDebtFairValue / us-gaap_DebtInstrumentAxis = oge_OgAndEIndustrialAuthorityBondsMember | 135.4 us-gaap_LongTermDebtFairValue / us-gaap_DebtInstrumentAxis = oge_OgAndEIndustrialAuthorityBondsMember
OG&E Tinker Debt [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Long-Term Debt, Carrying Amount | 10.2 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = oge_OgAndETinkerDebtMember | 10.2 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = oge_OgAndETinkerDebtMember
Long-Term Debt, Fair Value | 10.5 us-gaap_LongTermDebtFairValue / us-gaap_DebtInstrumentAxis = oge_OgAndETinkerDebtMember | 10.3 us-gaap_LongTermDebtFairValue / us-gaap_DebtInstrumentAxis = oge_OgAndETinkerDebtMember
OGE Energy Senior Notes [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Long-Term Debt, Carrying Amount | 100.0 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = oge_OgeEnergySeniorNotesMember | 100.0 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = oge_OgeEnergySeniorNotesMember
Long-Term Debt, Fair Value | $ 99.9 us-gaap_LongTermDebtFairValue / us-gaap_DebtInstrumentAxis = oge_OgeEnergySeniorNotesMember | $ 99.9 us-gaap_LongTermDebtFairValue / us-gaap_DebtInstrumentAxis = oge_OgeEnergySeniorNotesMember

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- Definition Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 7 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20, 22 -Article 5 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
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