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Investment in Unconsolidated Affiliates (Details) - USD ($) $ / shares in Units, $ in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | ---
Apr. 30, 2014 | Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015 | May 13, 2014 | May 01, 2013
Limited Partner Units Owned |  | 111,000,000 |  | 111,000,000 |  |  |
Distribution Made to Limited Partner, Distributions Declared, Per Unit |  |  |  | $ 0.31800 |  |  |
Equity in earnings of unconsolidated affiliates |  | $ 16.7 | $ 28.2 | $ 45.0 | $ 59.9 |  |
percentage of subsidiary contributed |  |  |  |  |  | 24.95% |
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity |  | 768.7 |  | 768.7 |  |  |
Enogex LLC [Member] |  |  |  |  |  |  |
Percentage of Enogex LLC Contributed |  |  |  |  |  |  | 100.00%
Increase in fair value of net assets |  |  |  |  |  |  | $ 2,200.0
Enable Midstream Partners [Member] |  |  |  |  |  |  |
Partners' Capital Account, Units, Sold in Public Offering | 25,000,000 |  |  |  |  |  |
Distributions from unconsolidated affiliates |  | $ 35.3 | $ 34.6 | $ 70.6 | $ 68.9 |  |
CenterPoint [Member] |  |  |  |  |  |  |
Percent of Incentive Distribution Rights |  | 40.00% |  | 40.00% |  |  |
OGE Holdings [Member] |  |  |  |  |  |  |
Subordinated Units Held by Limited Partners of the LLC or LP. |  |  |  | 68,200,000 |  |  |
Percent of Incentive Distribution Rights |  | 60.00% |  | 60.00% |  |  |
Limited Liability Company (LLC) or Limited Partnership (LP), Members or Limited Partners, Ownership Interest |  |  |  | 26.30% |  |  |

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