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Investment in Unconsolidated Affiliates (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2017 | Mar. 31, 2016 | Dec. 31, 2016 | May 01, 2013
Expected Settlement Charge | $ 20.9 |  |  |
Limited Partner Units Owned | 111.0 |  |  |
Distribution Made to Limited Partner, Distributions Declared, Per Unit | $ 0.31800 |  |  |
Equity in earnings of unconsolidated affiliates | $ 35.6 | $ 28.3 |  |
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity | 736.6 |  | $ 743.7 |
Enogex LLC [Member] |  |  |  |
Percentage of Enogex LLC Contributed |  |  |  | 100.00%
Increase in fair value of net assets |  |  |  | $ 2,200.0
Enable Midstream Partners [Member] |  |  |  |
Distributions from unconsolidated affiliates | $ 35.3 | $ 35.3 |  |
OGE Holdings [Member] |  |  |  |
Subordinated Units Held by Limited Partners of the LLC or LP. | 68.2 |  |  |
Limited Liability Company (LLC) or Limited Partnership (LP), Members or Limited Partners, Ownership Interest | 25.70% | 26.30% |  |

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