Derivative Instruments and Hedging Activities, Income Statement Presentation Related to Derivative Instruments (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	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