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

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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 -Paragraph 1 -Subparagraph (SX 210.5-05.6(a)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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