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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, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015
Reconciliation of Equity in Earnings of Unconsolidated Affiliates [Line Items] |  |  |  |
OGE's share of Enable net income | $ 9.1 | $ 20.6 | $ 30.4 | $ 44.4
Amortization of basis difference | 3.0 | 3.6 | 5.9 | 7.1
Elimination of Enogex Holdings fair value and other adjustments | 4.6 | 4.0 | 8.7 | 8.4
Equity in earnings of unconsolidated affiliates | $ 16.7 | $ 28.2 | $ 45.0 | $ 59.9

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