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Investment in Unconsolidated Affiliates Reconciliation of Equity in Earnings of Unconsolidated Affiliates (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		5 Months Ended	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2013	Sep. 30, 2012
Equity Method Investments and Joint Ventures [Abstract]
OGE's 28.5% share of Enable Net Income	$ 35.1		$ 53.6
Amortization of basis difference	5.9		5.9
Elimination of Enogex Holdings fair value adjustments	5.0		5.0
Equity in earnings of unconsolidated affiliates (Note 1)	$ 46.0	$ 0	$ 64.5	$ 64.5	$ 0

This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee.

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