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Investment in Unconsolidated Affiliates Reconciliation of Equity in Earnings of Unconsolidated Affiliates (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014
Reconciliation of Equity in Earnings of Unconsolidated Affiliates [Line Items] |  |  |  |  |  |  |  |
OGE's share of Enable Net Income (Loss) | $ (80.3) |  | $ 36.4 |  | $ (35.9) |  | $ 111.1 |
Amortization of basis difference | 3.5 |  | 3.4 |  | 10.6 |  | 10.4 |
Elimination of Enogex Holdings fair value and other adjustments | 4.9 |  | 4.9 |  | 13.3 |  | 10.4 |
OGE's Equity in earnings of unconsolidated affiliates | $ (71.9) | [1] | $ 44.7 | [1] | $ (12.0) | [2] | $ 131.9 | [2]
[1] | The Company recorded a $108.4 million pre-tax charge during the three months ended September 30, 2015 for its share of Enable's goodwill impairment, as adjusted for the basis differences. See Note 3 for further discussion of Enable's goodwill impairment.
[2] | The Company recorded a $108.4 million pre-tax charge during the nine months ended September 30, 2015 for its share of Enable's goodwill impairment, as adjusted for the basis differences. See Note 3 of this Form 10-Q for further discussion of Enable's goodwill impairment.

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