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Investment in Unconsolidated Affiliates (Details) - USD ($) $ / shares in Units, $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Apr. 30, 2014 | Sep. 30, 2015 | Jun. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014 | Apr. 16, 2014 | May. 01, 2013
Distribution Made to Limited Partner, Distributions Declared, Per Unit |  | $ 0.31800 |  | $ 0.31600 |  |  |  |  |  |  |  |
Threshold for Per Unit Incentive Distributions |  | $ 0.330625 |  |  |  |  | $ 0.330625 |  |  |  |  |
Incentive Distribution Percentage Level |  |  |  |  |  |  | 50.00% |  |  |  |  |
Equity in earnings of unconsolidated affiliates |  | $ (71.9) | [1] |  | $ 44.7 | [1] | $ (12.0) | [2] | $ 131.9 | [2] |  |
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity |  | 800.0 |  |  |  |  | 800.0 |  |  |  |  |
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] |  |  |  |  |  |  |  |  |  |  |  |
Goodwill, Impairment Loss |  | 1,086.4 |  |  |  |  | 1,086.4 |  |  |  |  |
Partners' Capital Account, Units, Sold in Public Offering | 25,000,000 |  |  |  |  |  |  |  |  |  |  |
Distributions from unconsolidated affiliates |  | $ 35.1 |  |  | $ 33.6 |  | $ 104.0 |  | $ 110.1 |  |  |
CenterPoint [Member] |  |  |  |  |  |  |  |  |  |  |  |
Percent of Subordinated Limited Partner Units |  |  |  |  |  |  |  |  |  |  | 61.40% |
OGE Holdings [Member] |  |  |  |  |  |  |  |  |  |  |  |
Percent of Subordinated Limited Partner Units |  |  |  |  |  |  |  |  |  |  | 61.40% |
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] |  |  |  |  |  |  |  |  |  |  |  |
Goodwill, Impairment Loss |  | $ 108.4 |  |  |  |  | $ 108.4 |  |  |  |  |
Limited Liability Company (LLC) or Limited Partnership (LP), Members or Limited Partners, Ownership Interest |  |  |  |  |  |  | 26.30% |  |  |  |  |
[1] | The Company recorded a $108.4 million pre-tax charge during the three months ended September 30, 2015 for its share of Enable's goodwill impairment, as adjusted for the basis differences. See Note 3 for further discussion of Enable's goodwill impairment.
[2] | The Company recorded a $108.4 million pre-tax charge during the nine months ended September 30, 2015 for its share of Enable's goodwill impairment, as adjusted for the basis differences. See Note 3 of this Form 10-Q for further discussion of Enable's goodwill impairment.

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