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Noncontrolling Interests (Narrative) (Details) - USD ($) shares in Millions, $ in Millions |  |  |  | 1 Months Ended | 9 Months Ended
--- | --- | --- | --- | --- | ---
Oct. 29, 2015 | Sep. 30, 2015 | Dec. 31, 2014 | Apr. 30, 2015 | Mar. 31, 2015 | Sep. 30, 2015 | Sep. 30, 2014
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |
Number of units sold to public for interests in EnLink |  |  |  | 3.4 | 22.8 |  |
Sale of investment in EnLink |  |  |  | $ 85.0 | $ 569.0 | $ 654.0 |
Net proceeds of common units sold |  |  |  |  |  | 13.0 | $ 72.0
Distributions to unitholders other than Devon |  |  |  |  |  | $ 186.0 | $ 187.0
Equity Distribution Agreements [Member] |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |
Number of units sold to public for interests in EnLink |  |  |  |  |  | 0.7 | 2.4
Net proceeds of common units sold |  |  |  |  |  | $ 13.0 | $ 72.0
EnLink [Member] |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |
Percentage of ownership before stock transactions |  |  | 49.00% |  |  |  |
Percentage of ownership after stock transactions |  | 29.00% |  |  |  |  |
General Partner And EnLink [Member] |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |
Distributions to unitholders other than Devon |  |  |  |  |  | $ 186.0 | $ 187.0
Subsequent Event [Member] |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |
EnLink common units acquired in private placement | 2.8 |  |  |  |  |  |
EnLink proceeds of private placement transaction | $ 50.0 |  |  |  |  |  |

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