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Summary of Significant Accounting Policies Fuel Inventories (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Other	$ 108.0us-gaap_OtherLiabilitiesNoncurrent	$ 102.7us-gaap_OtherLiabilitiesNoncurrent
Public Utilities, Inventory, Fuel [Member]
Public Utilities, Inventory	66.7us-gaap_PublicUtilitiesInventory / us-gaap_PublicUtilitiesInventoryAxis = us-gaap_PublicUtilitiesInventoryFuelMember	74.4us-gaap_PublicUtilitiesInventory / us-gaap_PublicUtilitiesInventoryAxis = us-gaap_PublicUtilitiesInventoryFuelMember
Other	11.0us-gaap_OtherLiabilitiesNoncurrent / us-gaap_PublicUtilitiesInventoryAxis = us-gaap_PublicUtilitiesInventoryFuelMember
Other Assets	8.2us-gaap_OtherAssets / us-gaap_PublicUtilitiesInventoryAxis = us-gaap_PublicUtilitiesInventoryFuelMember
Enable Gas Transportation and Storage Agreement [Member] | Public Utilities, Inventory, Fuel [Member]
Public Utilities, Inventory	$ 2.7us-gaap_PublicUtilitiesInventory / oge_EnableGasTransportationandStorageAgreementAxis = oge_EnableGasTransportationandStorageAgreementMember / us-gaap_PublicUtilitiesInventoryAxis = us-gaap_PublicUtilitiesInventoryFuelMember

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- Definition

The aggregate carrying amounts, as of the balance sheet date, of assets not separately disclosed in the balance sheet.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.17)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

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-Paragraph 17

-Article 5



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

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- Definition

Aggregate carrying amount, as of the balance sheet date, of noncurrent obligations not separately disclosed in the balance sheet. Noncurrent liabilities are expected to be paid after one year (or the normal operating cycle, if longer).

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.24)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



Reference 2: http://www.xbrl.org/2003/role/presentationRef

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- Definition

The period end amount for a type of inventory held by the utility in a schedule of inventories.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Inventory

-URI http://asc.fasb.org/extlink&oid=6516093



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

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