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v3.5.0.2

Investment in Unconsolidated Affiliates Reconciliation of Equity in Earnings of Unconsolidated Affiliates (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015 | Dec. 31, 2015
Reconciliation of Equity in Earnings of Unconsolidated Affiliates [Line Items] |  |  |  |  |
Net income | $ 110.1 | $ (985.1) | $ 230.8 | $ (817.3) |
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity | 761.5 |  | 761.5 |  | $ 783.5
Timing Differences Related to Equity Method Investee Net Income | 3.0 | 4.2 | (3.6) | 9.9 |
Net Income Used to Calculate Equity in Earnings | 104.0 | (980.9) | 218.1 | (807.4) |
Proportionate Unconsolidated Affiliate Net Income | 27.3 | (257.2) | 57.5 | (212.0) |
OGE Energy's share of Enable net income (loss) | 27.3 | (79.5) | 58.1 | (34.3) |
Amortization of basis difference | (2.9) | (3.5) | 8.8 | (10.6) |
Elimination of Enable fair value step up | (4.3) | (4.1) | 12.6 | (11.7) |
Equity in earnings (loss) of unconsolidated affiliates | $ 34.5 | $ (71.9) | $ 79.5 | $ (12.0) |
OGE Holdings [Member] |  |  |  |  |
Reconciliation of Equity in Earnings of Unconsolidated Affiliates [Line Items] |  |  |  |  |
Limited Liability Company (LLC) or Limited Partnership (LP), Members or Limited Partners, Ownership Interest | 26.30% | 26.30% | 26.30% | 26.30% |
OGE Energy [Member] |  |  |  |  |
Reconciliation of Equity in Earnings of Unconsolidated Affiliates [Line Items] |  |  |  |  |
Goodwill, Impairment Loss | $ 0.0 | $ (177.7) | $ 0.6 | $ (177.7) |
Preferred Partner [Member] |  |  |  |  |
Reconciliation of Equity in Earnings of Unconsolidated Affiliates [Line Items] |  |  |  |  |
Distribution Made to Limited Partner, Cash Distributions Paid | $ (9.1) | $ 0.0 | $ (9.1) | $ 0.0 |

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