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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013
Reconciliation of Equity in Earnings of Unconsolidated Affiliates [Line Items] |  |  |  |
OGE's share of Enable Net Income | $ 32.2 | $ 18.5 | $ 74.7 |
Amortization of basis difference | 3.4 | 0 | 7.0 |
Elimination of Enogex Holdings fair value and other adjustments | 3.7 | 0 | 5.5 |
Equity in earnings of unconsolidated affiliates | $ 39.3 | $ 18.5 | $ 87.2 | $ 18.5

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