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Report of Business Segments (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating revenues | $ 526.2 us-gaap_Revenues | $ 754.7 us-gaap_Revenues | $ 611.8 us-gaap_Revenues | $ 560.4 us-gaap_Revenues | $ 508.9 us-gaap_Revenues | $ 723.2 us-gaap_Revenues | $ 734.2 us-gaap_Revenues | $ 901.4 us-gaap_Revenues | $ 2,453.1 us-gaap_Revenues | $ 2,867.7 us-gaap_Revenues | $ 3,671.2 us-gaap_Revenues
Cost of sales |  |  |  |  |  |  |  |  | 1,106.6 us-gaap_CostOfGoodsAndServicesSold | 1,428.9 us-gaap_CostOfGoodsAndServicesSold | 1,918.7 us-gaap_CostOfGoodsAndServicesSold
Other operation and maintenance |  |  |  |  |  |  |  |  | 439.6 us-gaap_OtherCostAndExpenseOperating | 489.2 us-gaap_OtherCostAndExpenseOperating | 601.5 us-gaap_OtherCostAndExpenseOperating
Depreciation and amortization |  |  |  |  |  |  |  |  | 281.4 us-gaap_DepreciationAndAmortization | 297.3 us-gaap_DepreciationAndAmortization | 371.4 us-gaap_DepreciationAndAmortization
Gain on insurance proceeds |  |  |  |  |  |  |  |  | 0 us-gaap_GainOnBusinessInterruptionInsuranceRecovery | 0 us-gaap_GainOnBusinessInterruptionInsuranceRecovery | (7.5)us-gaap_GainOnBusinessInterruptionInsuranceRecovery
Taxes other than income |  |  |  |  |  |  |  |  | 88.7 us-gaap_TaxesExcludingIncomeAndExciseTaxes | 98.8 us-gaap_TaxesExcludingIncomeAndExciseTaxes | 110.2 us-gaap_TaxesExcludingIncomeAndExciseTaxes
Operating income (loss) | 85.1 us-gaap_OperatingIncomeLoss | 248.1 us-gaap_OperatingIncomeLoss | 141.8 us-gaap_OperatingIncomeLoss | 61.8 us-gaap_OperatingIncomeLoss | 73.3 us-gaap_OperatingIncomeLoss | 260.9 us-gaap_OperatingIncomeLoss | 143.9 us-gaap_OperatingIncomeLoss | 75.4 us-gaap_OperatingIncomeLoss | 536.8 us-gaap_OperatingIncomeLoss | 553.5 us-gaap_OperatingIncomeLoss | 676.9 us-gaap_OperatingIncomeLoss
Equity in earnings of unconsolidated affiliates |  |  |  |  |  |  |  |  | 172.6 us-gaap_IncomeLossFromEquityMethodInvestments | 101.9 us-gaap_IncomeLossFromEquityMethodInvestments | 0 us-gaap_IncomeLossFromEquityMethodInvestments
Other income (expense) |  |  |  |  |  |  |  |  | 7.6 us-gaap_OtherNonoperatingIncomeExpense | 16.2 us-gaap_OtherNonoperatingIncomeExpense | 7.3 us-gaap_OtherNonoperatingIncomeExpense
Interest expense |  |  |  |  |  |  |  |  | 148.4 us-gaap_InterestExpense | 147.5 us-gaap_InterestExpense | 164.1 us-gaap_InterestExpense
Income tax expense |  |  |  |  |  |  |  |  | 172.8 us-gaap_IncomeTaxExpenseBenefit | 130.3 us-gaap_IncomeTaxExpenseBenefit | 135.1 us-gaap_IncomeTaxExpenseBenefit
NET INCOME | 58.4 us-gaap_ProfitLoss | 187.3 us-gaap_ProfitLoss | 100.8 us-gaap_ProfitLoss | 49.3 us-gaap_ProfitLoss | 57.6 us-gaap_ProfitLoss | 215.2 us-gaap_ProfitLoss | 93.0 us-gaap_ProfitLoss | 28.0 us-gaap_ProfitLoss | 395.8 us-gaap_ProfitLoss | 393.8 us-gaap_ProfitLoss | 385.0 us-gaap_ProfitLoss
Less: Net income attributable to noncontrolling interests |  |  |  |  |  |  |  |  | 0 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | 6.2 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | 30.0 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
NET INCOME ATTRIBUTABLE TO OGE ENERGY | 58.4 us-gaap_NetIncomeLoss | 187.3 us-gaap_NetIncomeLoss | 100.8 us-gaap_NetIncomeLoss | 49.3 us-gaap_NetIncomeLoss | 57.6 us-gaap_NetIncomeLoss | 215.2 us-gaap_NetIncomeLoss | 91.7 us-gaap_NetIncomeLoss | 23.1 us-gaap_NetIncomeLoss | 395.8 us-gaap_NetIncomeLoss | 387.6 us-gaap_NetIncomeLoss | 355.0 us-gaap_NetIncomeLoss
Investment in unconsolidated affiliates (at historical cost) | 1,318.2 us-gaap_EquityMethodInvestments |  |  |  | 1,298.8 us-gaap_EquityMethodInvestments |  |  |  | 1,318.2 us-gaap_EquityMethodInvestments | 1,298.8 us-gaap_EquityMethodInvestments |
Total assets | 9,527.8 us-gaap_Assets |  |  |  | 9,134.7 us-gaap_Assets |  |  |  | 9,527.8 us-gaap_Assets | 9,134.7 us-gaap_Assets | 9,922.2 us-gaap_Assets
Capital expenditures |  |  |  |  |  |  |  |  | 569.3 oge_PaymentsToAcquireProductiveAssetsIncludingPaymentsForBusinessCombination | 990.6 oge_PaymentsToAcquireProductiveAssetsIncludingPaymentsForBusinessCombination | 1,229.2 oge_PaymentsToAcquireProductiveAssetsIncludingPaymentsForBusinessCombination
Electric Utility [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 2,453.1 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = oge_ElectricUtilityMember | 2,262.2 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = oge_ElectricUtilityMember | 2,141.2 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = oge_ElectricUtilityMember
Cost of sales |  |  |  |  |  |  |  |  | 1,106.6 us-gaap_CostOfGoodsAndServicesSold / us-gaap_StatementBusinessSegmentsAxis = oge_ElectricUtilityMember | 965.9 us-gaap_CostOfGoodsAndServicesSold / us-gaap_StatementBusinessSegmentsAxis = oge_ElectricUtilityMember | 879.1 us-gaap_CostOfGoodsAndServicesSold / us-gaap_StatementBusinessSegmentsAxis = oge_ElectricUtilityMember
Other operation and maintenance |  |  |  |  |  |  |  |  | 453.2 us-gaap_OtherCostAndExpenseOperating / us-gaap_StatementBusinessSegmentsAxis = oge_ElectricUtilityMember | 438.8 us-gaap_OtherCostAndExpenseOperating / us-gaap_StatementBusinessSegmentsAxis = oge_ElectricUtilityMember | 446.3 us-gaap_OtherCostAndExpenseOperating / us-gaap_StatementBusinessSegmentsAxis = oge_ElectricUtilityMember
Depreciation and amortization |  |  |  |  |  |  |  |  | 270.8 us-gaap_DepreciationAndAmortization / us-gaap_StatementBusinessSegmentsAxis = oge_ElectricUtilityMember | 248.4 us-gaap_DepreciationAndAmortization / us-gaap_StatementBusinessSegmentsAxis = oge_ElectricUtilityMember | 248.7 us-gaap_DepreciationAndAmortization / us-gaap_StatementBusinessSegmentsAxis = oge_ElectricUtilityMember
Gain on insurance proceeds |  |  |  |  |  |  |  |  |  |  | 0 us-gaap_GainOnBusinessInterruptionInsuranceRecovery / us-gaap_StatementBusinessSegmentsAxis = oge_ElectricUtilityMember
Taxes other than income |  |  |  |  |  |  |  |  | 84.5 us-gaap_TaxesExcludingIncomeAndExciseTaxes / us-gaap_StatementBusinessSegmentsAxis = oge_ElectricUtilityMember | 83.8 us-gaap_TaxesExcludingIncomeAndExciseTaxes / us-gaap_StatementBusinessSegmentsAxis = oge_ElectricUtilityMember | 77.7 us-gaap_TaxesExcludingIncomeAndExciseTaxes / us-gaap_StatementBusinessSegmentsAxis = oge_ElectricUtilityMember
Operating income (loss) |  |  |  |  |  |  |  |  | 538.0 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = oge_ElectricUtilityMember | 525.3 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = oge_ElectricUtilityMember | 489.4 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = oge_ElectricUtilityMember
Equity in earnings of unconsolidated affiliates |  |  |  |  |  |  |  |  | 0 us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = oge_ElectricUtilityMember | 0 us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = oge_ElectricUtilityMember |
Other income (expense) |  |  |  |  |  |  |  |  | 7.1 us-gaap_OtherNonoperatingIncomeExpense / us-gaap_StatementBusinessSegmentsAxis = oge_ElectricUtilityMember | 10.1 us-gaap_OtherNonoperatingIncomeExpense / us-gaap_StatementBusinessSegmentsAxis = oge_ElectricUtilityMember | 10.1 us-gaap_OtherNonoperatingIncomeExpense / us-gaap_StatementBusinessSegmentsAxis = oge_ElectricUtilityMember
Interest expense |  |  |  |  |  |  |  |  | 141.5 us-gaap_InterestExpense / us-gaap_StatementBusinessSegmentsAxis = oge_ElectricUtilityMember | 129.3 us-gaap_InterestExpense / us-gaap_StatementBusinessSegmentsAxis = oge_ElectricUtilityMember | 124.6 us-gaap_InterestExpense / us-gaap_StatementBusinessSegmentsAxis = oge_ElectricUtilityMember
Income tax expense |  |  |  |  |  |  |  |  | 111.6 us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementBusinessSegmentsAxis = oge_ElectricUtilityMember | 113.5 us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementBusinessSegmentsAxis = oge_ElectricUtilityMember | 94.6 us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementBusinessSegmentsAxis = oge_ElectricUtilityMember
NET INCOME |  |  |  |  |  |  |  |  | 292.0 us-gaap_ProfitLoss / us-gaap_StatementBusinessSegmentsAxis = oge_ElectricUtilityMember | 292.6 us-gaap_ProfitLoss / us-gaap_StatementBusinessSegmentsAxis = oge_ElectricUtilityMember | 280.3 us-gaap_ProfitLoss / us-gaap_StatementBusinessSegmentsAxis = oge_ElectricUtilityMember
Less: Net income attributable to noncontrolling interests |  |  |  |  |  |  |  |  |  | 0 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest / us-gaap_StatementBusinessSegmentsAxis = oge_ElectricUtilityMember | 0 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest / us-gaap_StatementBusinessSegmentsAxis = oge_ElectricUtilityMember
NET INCOME ATTRIBUTABLE TO OGE ENERGY |  |  |  |  |  |  |  |  |  | 292.6 us-gaap_NetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = oge_ElectricUtilityMember | 280.3 us-gaap_NetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = oge_ElectricUtilityMember
Investment in unconsolidated affiliates (at historical cost) | 0 us-gaap_EquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = oge_ElectricUtilityMember |  |  |  | 0 us-gaap_EquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = oge_ElectricUtilityMember |  |  |  | 0 us-gaap_EquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = oge_ElectricUtilityMember | 0 us-gaap_EquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = oge_ElectricUtilityMember |
Total assets | 8,266.2 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = oge_ElectricUtilityMember |  |  |  | 7,694.9 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = oge_ElectricUtilityMember |  |  |  | 8,266.2 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = oge_ElectricUtilityMember | 7,694.9 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = oge_ElectricUtilityMember | 7,222.4 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = oge_ElectricUtilityMember
Capital expenditures |  |  |  |  |  |  |  |  | 565.4 oge_PaymentsToAcquireProductiveAssetsIncludingPaymentsForBusinessCombination / us-gaap_StatementBusinessSegmentsAxis = oge_ElectricUtilityMember | 797.6 oge_PaymentsToAcquireProductiveAssetsIncludingPaymentsForBusinessCombination / us-gaap_StatementBusinessSegmentsAxis = oge_ElectricUtilityMember | 704.4 oge_PaymentsToAcquireProductiveAssetsIncludingPaymentsForBusinessCombination / us-gaap_StatementBusinessSegmentsAxis = oge_ElectricUtilityMember
Natural Gas Midstream Operations [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 0 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = oge_NaturalGasMidstreamOperationsMember | 630.4 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = oge_NaturalGasMidstreamOperationsMember | 1,608.6 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = oge_NaturalGasMidstreamOperationsMember
Cost of sales |  |  |  |  |  |  |  |  | 0 us-gaap_CostOfGoodsAndServicesSold / us-gaap_StatementBusinessSegmentsAxis = oge_NaturalGasMidstreamOperationsMember | 489.0 us-gaap_CostOfGoodsAndServicesSold / us-gaap_StatementBusinessSegmentsAxis = oge_NaturalGasMidstreamOperationsMember | 1,120.1 us-gaap_CostOfGoodsAndServicesSold / us-gaap_StatementBusinessSegmentsAxis = oge_NaturalGasMidstreamOperationsMember
Other operation and maintenance |  |  |  |  |  |  |  |  | 1.2 us-gaap_OtherCostAndExpenseOperating / us-gaap_StatementBusinessSegmentsAxis = oge_NaturalGasMidstreamOperationsMember | 60.9 us-gaap_OtherCostAndExpenseOperating / us-gaap_StatementBusinessSegmentsAxis = oge_NaturalGasMidstreamOperationsMember | 172.9 us-gaap_OtherCostAndExpenseOperating / us-gaap_StatementBusinessSegmentsAxis = oge_NaturalGasMidstreamOperationsMember
Depreciation and amortization |  |  |  |  |  |  |  |  | 0 us-gaap_DepreciationAndAmortization / us-gaap_StatementBusinessSegmentsAxis = oge_NaturalGasMidstreamOperationsMember | 36.8 us-gaap_DepreciationAndAmortization / us-gaap_StatementBusinessSegmentsAxis = oge_NaturalGasMidstreamOperationsMember | 109.2 us-gaap_DepreciationAndAmortization / us-gaap_StatementBusinessSegmentsAxis = oge_NaturalGasMidstreamOperationsMember
Gain on insurance proceeds |  |  |  |  |  |  |  |  |  |  | (7.5)us-gaap_GainOnBusinessInterruptionInsuranceRecovery / us-gaap_StatementBusinessSegmentsAxis = oge_NaturalGasMidstreamOperationsMember
Taxes other than income |  |  |  |  |  |  |  |  | 0 us-gaap_TaxesExcludingIncomeAndExciseTaxes / us-gaap_StatementBusinessSegmentsAxis = oge_NaturalGasMidstreamOperationsMember | 10.5 us-gaap_TaxesExcludingIncomeAndExciseTaxes / us-gaap_StatementBusinessSegmentsAxis = oge_NaturalGasMidstreamOperationsMember | 28.3 us-gaap_TaxesExcludingIncomeAndExciseTaxes / us-gaap_StatementBusinessSegmentsAxis = oge_NaturalGasMidstreamOperationsMember
Operating income (loss) |  |  |  |  |  |  |  |  | (1.2)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = oge_NaturalGasMidstreamOperationsMember | 33.2 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = oge_NaturalGasMidstreamOperationsMember | 185.6 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = oge_NaturalGasMidstreamOperationsMember
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 |
Other income (expense) |  |  |  |  |  |  |  |  | 0 us-gaap_OtherNonoperatingIncomeExpense / us-gaap_StatementBusinessSegmentsAxis = oge_NaturalGasMidstreamOperationsMember | 8.9 us-gaap_OtherNonoperatingIncomeExpense / us-gaap_StatementBusinessSegmentsAxis = oge_NaturalGasMidstreamOperationsMember | (3.5)us-gaap_OtherNonoperatingIncomeExpense / us-gaap_StatementBusinessSegmentsAxis = oge_NaturalGasMidstreamOperationsMember
Interest expense |  |  |  |  |  |  |  |  | 0 us-gaap_InterestExpense / us-gaap_StatementBusinessSegmentsAxis = oge_NaturalGasMidstreamOperationsMember | 10.6 us-gaap_InterestExpense / us-gaap_StatementBusinessSegmentsAxis = oge_NaturalGasMidstreamOperationsMember | 32.6 us-gaap_InterestExpense / us-gaap_StatementBusinessSegmentsAxis = oge_NaturalGasMidstreamOperationsMember
Income tax expense |  |  |  |  |  |  |  |  | 69.1 us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementBusinessSegmentsAxis = oge_NaturalGasMidstreamOperationsMember | 26.9 us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementBusinessSegmentsAxis = oge_NaturalGasMidstreamOperationsMember | 45.7 us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementBusinessSegmentsAxis = oge_NaturalGasMidstreamOperationsMember
NET INCOME |  |  |  |  |  |  |  |  | 102.3 us-gaap_ProfitLoss / us-gaap_StatementBusinessSegmentsAxis = oge_NaturalGasMidstreamOperationsMember | 106.5 us-gaap_ProfitLoss / us-gaap_StatementBusinessSegmentsAxis = oge_NaturalGasMidstreamOperationsMember | 103.8 us-gaap_ProfitLoss / us-gaap_StatementBusinessSegmentsAxis = oge_NaturalGasMidstreamOperationsMember
Less: Net income attributable to noncontrolling interests |  |  |  |  |  |  |  |  |  | 6.6 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest / us-gaap_StatementBusinessSegmentsAxis = oge_NaturalGasMidstreamOperationsMember | 29.7 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest / us-gaap_StatementBusinessSegmentsAxis = oge_NaturalGasMidstreamOperationsMember
NET INCOME ATTRIBUTABLE TO OGE ENERGY |  |  |  |  |  |  |  |  |  | 99.9 us-gaap_NetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = oge_NaturalGasMidstreamOperationsMember | 74.1 us-gaap_NetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = oge_NaturalGasMidstreamOperationsMember
Investment in unconsolidated affiliates (at historical cost) | 1,318.2 us-gaap_EquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = oge_NaturalGasMidstreamOperationsMember |  |  |  | 1,298.8 us-gaap_EquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = oge_NaturalGasMidstreamOperationsMember |  |  |  | 1,318.2 us-gaap_EquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = oge_NaturalGasMidstreamOperationsMember | 1,298.8 us-gaap_EquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = oge_NaturalGasMidstreamOperationsMember |
Total assets | 1,461.2 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = oge_NaturalGasMidstreamOperationsMember |  |  |  | 1,348.6 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = oge_NaturalGasMidstreamOperationsMember |  |  |  | 1,461.2 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = oge_NaturalGasMidstreamOperationsMember | 1,348.6 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = oge_NaturalGasMidstreamOperationsMember | 2,681.3 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = oge_NaturalGasMidstreamOperationsMember
Capital expenditures |  |  |  |  |  |  |  |  | 0 oge_PaymentsToAcquireProductiveAssetsIncludingPaymentsForBusinessCombination / us-gaap_StatementBusinessSegmentsAxis = oge_NaturalGasMidstreamOperationsMember | 181.5 oge_PaymentsToAcquireProductiveAssetsIncludingPaymentsForBusinessCombination / us-gaap_StatementBusinessSegmentsAxis = oge_NaturalGasMidstreamOperationsMember | 506.5 oge_PaymentsToAcquireProductiveAssetsIncludingPaymentsForBusinessCombination / us-gaap_StatementBusinessSegmentsAxis = oge_NaturalGasMidstreamOperationsMember
Other Operations [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 0 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | 0 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | 0 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Cost of sales |  |  |  |  |  |  |  |  | 0 us-gaap_CostOfGoodsAndServicesSold / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | 0 us-gaap_CostOfGoodsAndServicesSold / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | 0 us-gaap_CostOfGoodsAndServicesSold / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Other operation and maintenance |  |  |  |  |  |  |  |  | (14.8)us-gaap_OtherCostAndExpenseOperating / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | (10.5)us-gaap_OtherCostAndExpenseOperating / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | (17.7)us-gaap_OtherCostAndExpenseOperating / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Depreciation and amortization |  |  |  |  |  |  |  |  | 10.6 us-gaap_DepreciationAndAmortization / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | 12.1 us-gaap_DepreciationAndAmortization / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | 13.5 us-gaap_DepreciationAndAmortization / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Gain on insurance proceeds |  |  |  |  |  |  |  |  |  |  | 0 us-gaap_GainOnBusinessInterruptionInsuranceRecovery / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Taxes other than income |  |  |  |  |  |  |  |  | 4.2 us-gaap_TaxesExcludingIncomeAndExciseTaxes / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | 4.5 us-gaap_TaxesExcludingIncomeAndExciseTaxes / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | 4.2 us-gaap_TaxesExcludingIncomeAndExciseTaxes / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Operating income (loss) |  |  |  |  |  |  |  |  | 0 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | (6.1)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | 0 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Equity in earnings of unconsolidated affiliates |  |  |  |  |  |  |  |  | 0 us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | 0 us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember |
Other income (expense) |  |  |  |  |  |  |  |  | 0.7 us-gaap_OtherNonoperatingIncomeExpense / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | (2.3)us-gaap_OtherNonoperatingIncomeExpense / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | 1.8 us-gaap_OtherNonoperatingIncomeExpense / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Interest expense |  |  |  |  |  |  |  |  | 7.1 us-gaap_InterestExpense / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | 8.1 us-gaap_InterestExpense / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | 8.0 us-gaap_InterestExpense / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Income tax expense |  |  |  |  |  |  |  |  | (7.9)us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | (10.6)us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | (5.8)us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
NET INCOME |  |  |  |  |  |  |  |  | 1.5 us-gaap_ProfitLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | (5.9)us-gaap_ProfitLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | (0.4)us-gaap_ProfitLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Less: Net income attributable to noncontrolling interests |  |  |  |  |  |  |  |  |  | 0 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | 0 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
NET INCOME ATTRIBUTABLE TO OGE ENERGY |  |  |  |  |  |  |  |  |  | (5.9)us-gaap_NetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | (0.4)us-gaap_NetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Investment in unconsolidated affiliates (at historical cost) | 0 us-gaap_EquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember |  |  |  | 0 us-gaap_EquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember |  |  |  | 0 us-gaap_EquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | 0 us-gaap_EquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember |
Total assets | 129.2 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember |  |  |  | 216.2 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember |  |  |  | 129.2 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | 216.2 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | 242.6 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Capital expenditures |  |  |  |  |  |  |  |  | 10.8 oge_PaymentsToAcquireProductiveAssetsIncludingPaymentsForBusinessCombination / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | 11.5 oge_PaymentsToAcquireProductiveAssetsIncludingPaymentsForBusinessCombination / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | 18.3 oge_PaymentsToAcquireProductiveAssetsIncludingPaymentsForBusinessCombination / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Eliminations [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 0 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = us-gaap_IntersegmentEliminationMember | (24.9)us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = us-gaap_IntersegmentEliminationMember | (78.6)us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = us-gaap_IntersegmentEliminationMember
Cost of sales |  |  |  |  |  |  |  |  | 0 us-gaap_CostOfGoodsAndServicesSold / us-gaap_StatementBusinessSegmentsAxis = us-gaap_IntersegmentEliminationMember | (26.0)us-gaap_CostOfGoodsAndServicesSold / us-gaap_StatementBusinessSegmentsAxis = us-gaap_IntersegmentEliminationMember | (80.5)us-gaap_CostOfGoodsAndServicesSold / us-gaap_StatementBusinessSegmentsAxis = us-gaap_IntersegmentEliminationMember
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Gain on insurance proceeds |  |  |  |  |  |  |  |  |  |  | 0 us-gaap_GainOnBusinessInterruptionInsuranceRecovery / us-gaap_StatementBusinessSegmentsAxis = us-gaap_IntersegmentEliminationMember
Taxes other than income |  |  |  |  |  |  |  |  | 0 us-gaap_TaxesExcludingIncomeAndExciseTaxes / us-gaap_StatementBusinessSegmentsAxis = us-gaap_IntersegmentEliminationMember | 0 us-gaap_TaxesExcludingIncomeAndExciseTaxes / us-gaap_StatementBusinessSegmentsAxis = us-gaap_IntersegmentEliminationMember | 0 us-gaap_TaxesExcludingIncomeAndExciseTaxes / us-gaap_StatementBusinessSegmentsAxis = us-gaap_IntersegmentEliminationMember
Operating income (loss) |  |  |  |  |  |  |  |  | 0 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_IntersegmentEliminationMember | 1.1 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_IntersegmentEliminationMember | 1.9 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_IntersegmentEliminationMember
Equity in earnings of unconsolidated affiliates |  |  |  |  |  |  |  |  | 0 us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = us-gaap_IntersegmentEliminationMember | 0 us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = us-gaap_IntersegmentEliminationMember |
Other income (expense) |  |  |  |  |  |  |  |  | (0.2)us-gaap_OtherNonoperatingIncomeExpense / us-gaap_StatementBusinessSegmentsAxis = us-gaap_IntersegmentEliminationMember | (0.5)us-gaap_OtherNonoperatingIncomeExpense / us-gaap_StatementBusinessSegmentsAxis = us-gaap_IntersegmentEliminationMember | (1.1)us-gaap_OtherNonoperatingIncomeExpense / us-gaap_StatementBusinessSegmentsAxis = us-gaap_IntersegmentEliminationMember
Interest expense |  |  |  |  |  |  |  |  | (0.2)us-gaap_InterestExpense / us-gaap_StatementBusinessSegmentsAxis = us-gaap_IntersegmentEliminationMember | (0.5)us-gaap_InterestExpense / us-gaap_StatementBusinessSegmentsAxis = us-gaap_IntersegmentEliminationMember | (1.1)us-gaap_InterestExpense / us-gaap_StatementBusinessSegmentsAxis = us-gaap_IntersegmentEliminationMember
Income tax expense |  |  |  |  |  |  |  |  | 0 us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementBusinessSegmentsAxis = us-gaap_IntersegmentEliminationMember | 0.5 us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementBusinessSegmentsAxis = us-gaap_IntersegmentEliminationMember | 0.6 us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementBusinessSegmentsAxis = us-gaap_IntersegmentEliminationMember
NET INCOME |  |  |  |  |  |  |  |  | 0 us-gaap_ProfitLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_IntersegmentEliminationMember | 0.6 us-gaap_ProfitLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_IntersegmentEliminationMember | 1.3 us-gaap_ProfitLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_IntersegmentEliminationMember
Less: Net income attributable to noncontrolling interests |  |  |  |  |  |  |  |  |  | (0.4)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest / us-gaap_StatementBusinessSegmentsAxis = us-gaap_IntersegmentEliminationMember | 0.3 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest / us-gaap_StatementBusinessSegmentsAxis = us-gaap_IntersegmentEliminationMember
NET INCOME ATTRIBUTABLE TO OGE ENERGY |  |  |  |  |  |  |  |  |  | 1.0 us-gaap_NetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_IntersegmentEliminationMember | 1.0 us-gaap_NetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_IntersegmentEliminationMember
Investment in unconsolidated affiliates (at historical cost) | 0 us-gaap_EquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = us-gaap_IntersegmentEliminationMember |  |  |  | 0 us-gaap_EquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = us-gaap_IntersegmentEliminationMember |  |  |  | 0 us-gaap_EquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = us-gaap_IntersegmentEliminationMember | 0 us-gaap_EquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = us-gaap_IntersegmentEliminationMember |
Total assets | (328.8)us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_IntersegmentEliminationMember |  |  |  | (125.0)us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_IntersegmentEliminationMember |  |  |  | (328.8)us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_IntersegmentEliminationMember | (125.0)us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_IntersegmentEliminationMember | (224.1)us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_IntersegmentEliminationMember
Capital expenditures |  |  |  |  |  |  |  |  | $ (6.9)oge_PaymentsToAcquireProductiveAssetsIncludingPaymentsForBusinessCombination / us-gaap_StatementBusinessSegmentsAxis = us-gaap_IntersegmentEliminationMember | $ 0 oge_PaymentsToAcquireProductiveAssetsIncludingPaymentsForBusinessCombination / us-gaap_StatementBusinessSegmentsAxis = us-gaap_IntersegmentEliminationMember | $ 0 oge_PaymentsToAcquireProductiveAssetsIncludingPaymentsForBusinessCombination / us-gaap_StatementBusinessSegmentsAxis = us-gaap_IntersegmentEliminationMember

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- Definition All taxes not related to income of the entity or excise or sales taxes levied on the revenue of the entity that are not reported elsewhere. These taxes could include production, real estate, personal property, and pump tax. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.9) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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