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v2.4.1.9

Investment in Unconsolidated Affiliate and Related Party Transactions Reconciliation of Equity in Earnings of Unconsolidated Affiliates (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Schedule of Equity Method Investments [Line Items] |  |  |
OGE's share of Enable Net Income | $ 143.1 oge_ProportionateShareofUnconsolidatedAffiliateNetIncome | $ 82.1 oge_ProportionateShareofUnconsolidatedAffiliateNetIncome |
Amortization of basis difference | 14.0 oge_EquityinEarningsAmortizationofBasisDifference | 9.4 oge_EquityinEarningsAmortizationofBasisDifference |
Elimination of Enogex Holdings fair value and other adjustments | 15.5 oge_EquityinEarningsEliminationofFairValueAdjustments | 10.4 oge_EquityinEarningsEliminationofFairValueAdjustments |
OGE's Equity in earnings of unconsolidated affiliates | 172.6 us-gaap_IncomeLossFromEquityMethodInvestments | 101.9 us-gaap_IncomeLossFromEquityMethodInvestments | 0 us-gaap_IncomeLossFromEquityMethodInvestments
Natural Gas Midstream Operations [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
OGE's Equity in earnings of unconsolidated affiliates | $ 172.6 us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = oge_NaturalGasMidstreamOperationsMember | $ 101.9 us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = oge_NaturalGasMidstreamOperationsMember |

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