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Investment in Unconsolidated Affiliates Reconciliation of Equity in Earnings of Unconsolidated Affiliates (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014
Reconciliation of Equity in Earnings of Unconsolidated Affiliates [Line Items] |  |  |  |
OGE's share of Enable Net Income | $ 20.6 | $ 32.2 | $ 44.4 | $ 74.7
Amortization of basis difference | 3.6 | 3.4 | 7.1 | 7.0
Elimination of Enogex Holdings fair value and other adjustments | 4.0 | 3.7 | 8.4 | 5.5
OGE's Equity in earnings of unconsolidated affiliates | $ 28.2 | $ 39.3 | $ 59.9 | $ 87.2

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