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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
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Mar. 31, 2014 | Mar. 31, 2013
Equity Method Investments and Joint Ventures [Abstract] |  |
OGE's 28.5% share of Enable Net Income | $ 42.5 |
Amortization of basis difference | 3.6 |
Elimination of Enogex Holdings fair value and other adjustments | 1.8 |
Equity in earnings of unconsolidated affiliates | $ 47.9 | $ 0

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