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

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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.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

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-SubTopic 10

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Amount of interest capitalized during the period.

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-Publisher FASB

-Name Accounting Standards Codification

-Glossary Allowance for Funds Used during Construction

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