Summary of Significant Accounting Policies Asset Retirement Obligation (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Balance at January 1	$ 54.0		$ 24.8
Liabilities settled	(0.4)	[1]	0.4	[1]
Accretion expense	2.3		1.9
Revisions in estimated cash flows	(0.7)	[2]	26.9	[2]
Balance at December 31	55.2		54.0
OGE Enogex Holdings [Member]
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Balance at December 31	$ 0

[1] As a result of the formation of Enable on May 1, 2013, the Company has no obligations at December 31, 2013 under OGE Holdings' asset retirement obligations previously disclosed in the Company's 2012 10-K.

[2] Due to changes to OG&E's asset retirement obligations related to its wind farms as a result of changes in the assumption related to the timing of removal used in the valuation of the asset retirement obligations.