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Investment in Unconsolidated Affiliates (Details) (USD $) In Millions, except Share data, unless otherwise specified | 3 Months Ended |  | 3 Months Ended | 6 Months Ended | 1 Months Ended | 3 Months Ended |  | 3 Months Ended | 6 Months Ended
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Jun. 30, 2014 | Jun. 30, 2014 Enogex LLC [Member] | Jun. 30, 2014 Southeast Supply Header, LLC [Member] | Jun. 30, 2014 ArcLight group [Member] | Jun. 30, 2014 OGE Holdings [Member] | May 30, 2014 OGE Energy [Member] | Jun. 30, 2014 OGE Energy [Member] | Mar. 31, 2014 OGE Energy [Member] | Jun. 30, 2014 CenterPoint [Member] | Jun. 30, 2014 Enable Midstream Partners [Member] | Jun. 30, 2014 Enable Midstream Partners [Member]
Percentage of Enogex LLC Contributed |  | 100.00% |  |  |  |  |  |  |  |  |
Percentage of Subsidiary Contributed |  |  | 24.95% |  |  |  |  |  |  |  |
Partners' Capital Account, Units, Acquisitions | 6,322,457 |  |  |  |  |  |  |  |  |  |
Percentage Share of Management Rights |  |  |  |  |  |  | 50.00% |  | 50.00% |  |
Contributions to Pay Down Short-Term Debt |  |  |  | $ 107.0 | $ 9.1 |  |  |  |  |  |
Limited Liability Company (LLC) or Limited Partnership (LP), Members or Limited Partners, Ownership Interest | 6.00% |  |  |  |  | 26.70% | 26.30% | 28.50% |  |  |
Units Held by Limited Partners of the LLC or LP. |  |  |  |  | 42,832,291 |  |  |  |  |  |
Percent of Incentive Distribution Rights |  |  |  |  |  |  | 60.00% |  | 40.00% |  |
Partners' Capital Account, Units, Sold in Public Offering |  |  |  | 3,750,000 |  |  |  |  |  | 25,000,000 |
Proceeds from Issuance Initial Public Offering |  |  |  |  |  |  |  |  |  | 464.0 |
Distributions from unconsolidated affiliates |  |  |  |  |  |  |  |  |  | $ 44.0 | $ 76.5

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