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Investment in Unconsolidated Affiliate and Related Party Transactions (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | 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 | 25.60% | 25.70% | 25.70% |
Distribution Made to Limited Partner, Distributions Declared, Per Unit | $ 0.31800 |  |  |
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity | $ 680.3 | $ 714.2 |  |
Equity in earnings of unconsolidated affiliates | 152.8 | 131.2 | $ 101.8 |
Enable Midstream Partners [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Distributions received | $ 141.2 | 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 | 25.60% |  |  |
OGE Energy [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Goodwill, Impairment Loss | $ 0.0 | 0.0 | (2.6) |
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 | $ 152.8 | $ 131.2 | $ 101.8 |

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