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Investment in Unconsolidated Affiliate and Related Party Transactions Reconciliation of Equity in Earnings of Unconsolidated Affiliates (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Schedule of Equity Method Investments [Line Items] |  |  |  |
Enable net income |  | $ 360.0 | $ 485.3 | $ 400.3
Limited Liability Company or Limited Partnership, Members or Limited Partners, Ownership Interest |  | 25.50% | 25.60% | 25.70%
Proportionate Unconsolidated Affiliate Net Income |  | $ 91.8 | $ 124.4 | $ 102.7
OGE Energy's portion of Enable net income |  |  |  | 102.7
Amortization of basis difference and dilution recognition | [1] | 22.1 | 28.4 | 28.5
Equity in earnings of unconsolidated affiliates |  | 113.9 | 152.8 | 131.2
Natural Gas Midstream Operations [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity in earnings of unconsolidated affiliates |  | $ 113.9 | $ 152.8 | $ 131.2
OGE Holdings [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Limited Liability Company or Limited Partnership, Members or Limited Partners, Ownership Interest |  | 25.50% |  |
OGE Energy [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Amortization of basis difference and dilution recognition | [2] | $ 27.8 |  |
[1] | Includes loss on dilution, net of proportional basis difference recognition.
[2] | Includes proportional basis difference recognition due to dilution.

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