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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, 2015 | Mar. 31, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014 | May. 01, 2013
Distribution Made to Limited Partner, Distributions Declared, Per Unit |  | $ 0.31600 | $ 0.31250 |  |  |  |
Threshold for Per Unit Incentive Distributions |  | $ 0.330625 |  |  | $ 0.330625 |  |
Incentive Distribution Percentage Level |  |  |  |  | 50.00% |  |
Equity in earnings of unconsolidated affiliates |  | $ 28.2 |  | $ 39.3 | $ 59.9 | $ 87.2 |
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity |  | 1,000.0 |  |  | 1,000.0 |  |
Enogex LLC [Member] |  |  |  |  |  |  |
Percentage of Enogex LLC Contributed |  |  |  |  |  |  | 100.00%
Increase in fair value of net assets |  | 2,200.0 |  |  | 2,200.0 |  |
Enable Midstream Partners [Member] |  |  |  |  |  |  |
Partners' Capital Account, Units, Sold in Public Offering | 25,000,000 |  |  |  |  |  |
Distributions from unconsolidated affiliates |  | $ 34.6 |  | $ 44.0 | $ 68.9 | $ 76.5 |
CenterPoint [Member] |  |  |  |  |  |  |
Percent of Subordinated Limited Partner Units |  | 61.40% |  |  | 61.40% |  |
OGE Holdings [Member] |  |  |  |  |  |  |
Common Units Held by Limited Partners of the LLC or LP. |  |  |  |  | 42,832,291 |  |
Subordinated Units Held by Limited Partners of the LLC or LP. |  |  |  |  | 68,150,514 |  |
Percent of Incentive Distribution Rights |  | 60.00% |  |  | 60.00% |  |
OGE Energy [Member] |  |  |  |  |  |  |
Limited Liability Company (LLC) or Limited Partnership (LP), Members or Limited Partners, Ownership Interest |  |  |  |  | 26.30% |  |

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