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Investment in Unconsolidated Affiliate and Related Party Transactions Reconciliation of Equity in Earnings of Unconsolidated Affiliates (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Schedule of Equity Method Investments [Line Items]
OGE's share of Enable Net Income	$ 143.1	$ 82.1
Amortization of basis difference	14.0	9.4
Elimination of Enogex Holdings fair value and other adjustments	15.5	10.4
OGE's Equity in earnings of unconsolidated affiliates	172.6	101.9	0
Natural Gas Midstream Operations [Member]
Schedule of Equity Method Investments [Line Items]
OGE's Equity in earnings of unconsolidated affiliates	$ 172.6	$ 101.9

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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