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v3.19.3.a.u2

Investment in Unconsolidated Affiliate and Related Party Transactions (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | May 01, 2013
Schedule of Equity Method Investments [Line Items] |  |  |  |
Limited Partner Units Owned | 111.0 |  |  |
Limited Liability Company or Limited Partnership, Members or Limited Partners, Ownership Interest | 25.50% | 25.60% | 25.70% |
Distribution Made to Limited Partner, Distributions Declared, Per Unit | $ 0.33050 |  |  |
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity | $ 652.5 | $ 680.3 |  |
Equity in earnings of unconsolidated affiliates | 113.9 | 152.8 | $ 131.2 |
Enable Midstream Partners [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Distributions received | $ 144.0 | 141.2 | 141.2 |
Enogex LLC [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Increase in fair value of net assets |  |  |  | $ 2,200.0
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] |  |  |  |
Percentage Share of Management Rights | 50.00% |  |  |
CenterPoint [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Percentage Share of Management Rights | 50.00% |  |  |
Natural Gas Midstream Operations [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity in earnings of unconsolidated affiliates | $ 113.9 | $ 152.8 | $ 131.2 |

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