Noncontrolling Interest Owner (Tables)

12 Months Ended

Dec. 31, 2011

Noncontrolling Interest [Abstract]

Schedule of Change in Ownership Percentage [Table Text Block]

In 2011, OGE Energy and the ArcLight group made contributions to Enogex Holdings of $70.9 million and $214.6 million, respectively, to fund a portion of Enogex LLC's 2011 capital requirements. Also, on February 1, 2011, OGE Energy sold a 0.1 percent membership interest in Enogex Holdings to the ArcLight group for $1.9 million. The following table summarizes changes in OGE Holdings' and the ArcLight group's membership interest in Enogex Holdings in 2011.

(In millions)	OGE Holdings		ArcLight group		Total
Balance at December 31, 2010 (units)	90.1		9.9		100.0
Ownership percentage at December 31, 2010	90.1	%	9.9	%	100.0	%
Sale of 100,000 units of Enogex Holdings (A)	(0.1	)	0.1		—
Issuance of 4,303,007 units of Enogex Holdings (B)	0.4		3.9		4.3
Issuance of 5,405,405 units of Enogex Holdings (C)	0.5		4.9		5.4
Issuance of 5,725,190 units of Enogex Holdings (D)	2.9		2.8		5.7
Balance at December 31, 2011 (units)	93.8		21.6		115.4
Ownership percentage at December 31, 2011	81.3	%	18.7	%	100.0	%

(A) On February 1, 2011, OGE Energy sold a 0.1 percent membership interest in Enogex Holdings to the ArcLight group for $1.9 million.

(B) On February 1, 2011, OGE Energy and the ArcLight group made contributions of $8.0 million and $71.6 million, respectively, to fund a portion of Enogex LLC's 2011 capital requirements.

(C) On October 3, 2011, OGE Energy and the ArcLight group made contributions of $10.0 million and $90.0 million, respectively, to fund a portion of Enogex LLC's 2011 capital requirements.

(D) On November 1, 2011, OGE Energy and the ArcLight group made contributions of $52.9 million and $53.0 million, respectively, to fund Enogex's gas gathering acquisitions as discussed in Note 3

Schedule of Equity Attributable to Changes in Ownership Percentage [Table Text Block]

The following table summarizes changes in OGE Energy's equity which represents changes in additional paid-in capital for unrecognized gains from the sale and issuance of equity interests in Enogex Holdings to the ArcLight group in 2011.

(In millions)
Net income attributable to OGE Energy	$	342.9
Transfers to the noncontrolling interest
Increase in paid-in capital for sale of 100,000 units of Enogex Holdings (net of tax of $0.3 million)	0.5
Increase in paid-in capital for issuance of 4,303,007 units of Enogex Holdings (net of tax of $10.9 million)	17.3
Increase in paid-in capital for issuance of 5,405,405 units of Enogex Holdings (net of tax of $12.3 million)	19.5
Increase in paid-in capital for issuance of 5,725,190 units of Enogex Holdings (net of tax of $5.2 million)	8.2
Net transfers to the noncontrolling interest	45.5
Total of net income attributable to OGE Energy and transfers from noncontrolling interest	$	388.4

Schedule of Distributions Made to Members or Limited Partners, by Distribution [Table Text Block]

The following table summarizes the quarterly distributions by Enogex Holdings to its partners in 2011.

(In millions)	OGE Holdings Portion		ArcLight group's Portion		Total Distribution
First quarter 2011	$	7.5	$	0.8	$	8.3
Second quarter 2011	34.3		5.3		39.6
Third quarter 2011	43.4		6.6		50.0
Fourth quarter 2011	30.4		4.7		35.1
Total	$	115.6	$	17.4	$	133.0