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Investment in Unconsolidated Affiliates Reconciliation of Equity in Earnings of Unconsolidated Affiliates (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2017 | Mar. 31, 2016 | Dec. 31, 2016
Reconciliation of Equity in Earnings of Unconsolidated Affiliates [Line Items] |  |  |
Net income | $ 110.8 | $ 86.0 |
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity | 736.6 |  | $ 743.7
Timing Differences Related to Equity Method Investee Net Income | 0.0 | (11.7) |
Net Income Used to Calculate Equity in Earnings | 110.8 | 74.3 |
Proportionate Unconsolidated Affiliate Net Income | 28.5 | 19.5 |
OGE Energy's share of Enable net income | 28.5 | 21.3 |
Amortization of basis difference | 2.8 | 2.9 |
Elimination of Enable fair value step up | 4.3 | 4.1 |
Equity in earnings of unconsolidated affiliates | $ 35.6 | $ 28.3 |
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 | 25.70% | 26.30% |
OGE Energy [Member] |  |  |
Reconciliation of Equity in Earnings of Unconsolidated Affiliates [Line Items] |  |  |
Goodwill, Impairment Loss | $ 0.0 | $ (1.8) |

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