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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, 2019 | Mar. 31, 2018 | Dec. 31, 2018
Reconciliation of Equity in Earnings of Unconsolidated Affiliates [Line Items] |  |  |
Net income | $ 113.2 | $ 104.6 |
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity | $ 670.4 |  | $ 680.3
Limited Liability Company or Limited Partnership, Members or Limited Partners, Ownership Interest | 25.50% | 25.60% |
Proportionate Unconsolidated Affiliate Net Income | $ 28.9 | $ 26.8 |
Amortization of basis difference | 1.8 | 7.1 |
Elimination of Enable fair value step up | 0.0 | 0.0 |
Proportional Basis Difference Recognition | 0.0 |  |
Dilution and Impairment Loss | 0.0 | 0.0 |
Equity in earnings of unconsolidated affiliates | 30.7 | 33.9 |
Timing Differences Related to Equity Method Investee Net Income | 0.1 | 0.0 |
Net Income Used to Calculate Equity in Earnings | $ 113.3 | $ 104.6 |
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 | 25.50% |  |
OGE Energy [Member] |  |  |
Reconciliation of Equity in Earnings of Unconsolidated Affiliates [Line Items] |  |  |
Amortization of basis difference | $ 9.9 |  |

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