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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, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Reconciliation of Equity in Earnings of Unconsolidated Affiliates [Line Items] |  |  |  |  |
Net income | $ 129.0 | $ 104.0 | $ 320.0 | $ 301.0 |
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity | 689.7 |  | 689.7 |  | $ 714.2
Proportionate Unconsolidated Affiliate Net Income | 33.0 | 26.5 | 82.0 | 77.2 |
Amortization of basis difference | 2.8 | 2.8 | 8.4 | 8.5 |
Elimination of Enable fair value step up | (4.3) | (4.3) | (12.9) | (12.9) |
Equity in earnings of unconsolidated affiliates | $ 40.1 | $ 33.6 | 103.3 | $ 98.6 |
Equity in Earnings Change in Basis Difference |  |  | $ (3.2) |  |
OGE Holdings [Member] |  |  |  |  |
Reconciliation of Equity in Earnings of Unconsolidated Affiliates [Line Items] |  |  |  |  |
Limited Liability Company or Limited Partnership, Members or Limited Partners, Ownership Interest | 25.60% | 25.70% | 25.60% | 25.70% |
OGE Energy [Member] |  |  |  |  |
Reconciliation of Equity in Earnings of Unconsolidated Affiliates [Line Items] |  |  |  |  |
Amortization of basis difference |  |  | $ 8.4 |  |

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