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Derivative Instruments and Hedging Activities, Income Statement Presentation Related to Derivative Instruments (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Cash Flow Hedging [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Amount Recognized in Other Comprehensive Income | $ (0.2) | $ 0.5 |
Amount Reclassifed from Accumulated Other Comprehensive Income (Loss) into Income | 5.0 | 4.8 |
Amount Recognized in Income | 0 | 0 |
Enogex [Member] | Cash Flow Hedging [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Amount Recognized in Other Comprehensive Income |  |  | (5.5)
Amount Reclassifed from Accumulated Other Comprehensive Income (Loss) into Income |  |  | (40.6)
Amount Recognized in Income |  |  | 0
Enogex [Member] | Not Designated as Hedging Instrument [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Amount Recognized in Income | (5.1) | (10.6) | (9.6)
Enogex [Member] | NGLs [Member] | Options [Member] | Cash Flow Hedging [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Amount Recognized in Other Comprehensive Income |  |  | (8.4)
Amount Reclassifed from Accumulated Other Comprehensive Income (Loss) into Income |  |  | (9.8)
Amount Recognized in Income |  |  | 0
Enogex [Member] | Natural Gas [Member] | Fixed Swaps/Futures [Member] | Cash Flow Hedging [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Amount Recognized in Other Comprehensive Income | (0.2) | 0.5 | 2.9
Amount Reclassifed from Accumulated Other Comprehensive Income (Loss) into Income | 5.2 | 5.2 | (30.4)
Amount Recognized in Income | 0 | 0 | 0
Enogex [Member] | Natural Gas [Member] | Fixed Swaps/Futures [Member] | Not Designated as Hedging Instrument [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Amount Recognized in Income | 1.0 | 1.1 | 0.4
Enogex [Member] | Sales [Member] | Natural Gas [Member] | Physical [Member] | Not Designated as Hedging Instrument [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Amount Recognized in Income | (6.1) | (11.7) | (10.0)
OGE Energy Corp. [Member] | Interest Rate Swap [Member] | Cash Flow Hedging [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Amount Recognized in Other Comprehensive Income | 0 | 0 | 0
Amount Reclassifed from Accumulated Other Comprehensive Income (Loss) into Income | (0.2) | (0.4) | (0.4)
Amount Recognized in Income | 0 | 0 | 0
Maximum [Member] | Enogex [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Additional Collateral, Aggregate Fair Value |  | $ 0.2 |

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- Definition The aggregate fair value of additional assets that would be required to be posted as collateral for derivative instruments with credit-risk-related contingent features if the credit-risk-related contingent features were triggered at the end of the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4H -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624258-113959 + Details
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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5618551-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a),(c),(d),(e) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959 + Details
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- Details
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- Definition The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4D -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624177-113959 + Details
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- Definition The effective portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959 + Details
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