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Supplemental Cash Flow Information (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
NON-CASH INVESTING AND FINANCING ACTIVITIES |  |  |  |  |  |
Installment payments for Tinker electric distribution system | $ 0 oge_InstallmentPaymentsForTinkerElectricDistributionSystem |  | $ 0 oge_InstallmentPaymentsForTinkerElectricDistributionSystem |  | $ 10.6 oge_InstallmentPaymentsForTinkerElectricDistributionSystem |
Power plant long-term service agreement | 0 oge_PowerPlantLongTermServiceAgreement |  | 9.7 oge_PowerPlantLongTermServiceAgreement |  | 0 oge_PowerPlantLongTermServiceAgreement |
Investment in Enable | 0 oge_InvestmentinEnable |  | 1,248.6 oge_InvestmentinEnable |  | 0 oge_InvestmentinEnable |
SUPPLEMENTAL CASH FLOW INFORMATION |  |  |  |  |  |
Interest (net of interest capitalized) | 150.8 us-gaap_InterestPaidNet | [1] | 151.1 us-gaap_InterestPaidNet | [1] | 161.3 us-gaap_InterestPaidNet | [1]
Income taxes (net of income tax refunds) | 0.2 us-gaap_IncomeTaxesPaidNet |  | (1.1)us-gaap_IncomeTaxesPaidNet |  | (9.1)us-gaap_IncomeTaxesPaidNet |
Interest costs capitalized | $ 2.4 us-gaap_InterestCostsCapitalized |  | $ 5.4 us-gaap_InterestCostsCapitalized |  | $ 8.0 us-gaap_InterestCostsCapitalized |
[1] | Net of interest capitalized of $2.4 million, $5.4 million and $8.0 million in 2014, 2013 and 2012, respectively.

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- Definition The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4297-108586 + Details
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