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Investment in Unconsolidated Affiliates Reconciliation of Equity in Earnings of Unconsolidated Affiliates (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Reconciliation of Equity in Earnings of Unconsolidated Affiliates [Line Items] |  |  |  |  |  |
Net income |  | $ 114.8 | $ 86.4 | $ 228.0 | $ 191.0 |
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity |  | $ 666.8 |  | $ 666.8 |  | $ 680.3
Limited Liability Company or Limited Partnership, Members or Limited Partners, Ownership Interest |  | 25.50% | 25.60% | 25.50% | 25.60% |
Proportionate Unconsolidated Affiliate Net Income |  | $ 29.3 | $ 22.2 | $ 58.2 | $ 49.0 |
Amortization of basis difference | [1] | 6.5 | 7.1 | 8.3 | 14.2 |
Equity in earnings of unconsolidated affiliates |  | 35.8 | 29.3 | 66.5 | 63.2 |
Timing Differences Related to Equity Method Investee Net Income |  | 0.0 | 0.0 | 0.1 | 0.0 |
Net Income Used to Calculate Equity in Earnings |  | $ 114.8 | $ 86.4 | $ 228.1 | $ 191.0 |
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 | [2] |  |  | $ 13.5 |  |
[1] | Includes loss on dilution, net of proportional basis difference recognition.
[2] | Includes proportional basis difference recognition due to dilution.

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