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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, 2018 | Mar. 31, 2017 | Dec. 31, 2017
Reconciliation of Equity in Earnings of Unconsolidated Affiliates [Line Items] |  |  |
Net income | $ 104.6 | $ 110.8 |
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity | 706.2 |  | $ 714.2
Proportionate Unconsolidated Affiliate Net Income | 26.8 | 28.5 |
Amortization of basis difference | 2.8 | 2.8 |
Elimination of Enable fair value step up | 4.3 | 4.3 |
Equity in earnings of unconsolidated affiliates | 33.9 | $ 35.6 |
Equity in Earnings Change in Basis Difference | $ (0.9) |  |
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% |

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