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Equity and Distributions, Noncontrolling Interests (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Components of noncontrolling interests [Abstract] |  |  |  |  |
Joint venture partners | $ 108.3 | [1] | $ 105.9 | [1] |
Components of net income attributable to noncontrolling interests [Abstract] |  |  |  |  |
Limited partners of Enterprise other than Holdings (prior to Holdings Merger) | 0 |  | 0 |  | 1,000.3
Limited partners of Duncan Energy Partners other than EPO and its subsidiaries (prior to Duncan Merger) | 0 |  | 20.9 |  | 37.1
Joint venture partners | 8.1 |  | 20.5 |  | 25.5
Total | 8.1 |  | 41.4 |  | 1,062.9
Cash distributions paid to noncontrolling interests: |  |  |  |  |
Limited partners of Enterprise (prior to Holdings Merger) | 0 |  | 0 |  | 1,395.1
Limited partners of Duncan Energy Partners other than EPO and its subsidiaries (prior to Duncan Merger) | 0 |  | 32.9 |  | 42.9
Joint venture partners | 13.3 |  | 27.8 |  | 29.8
Total | 13.3 |  | 60.7 |  | 1,467.8
Cash contributions from noncontrolling interests: |  |  |  |  |
Limited partners of Enterprise (prior to Holdings Merger) | 0 |  | 0 |  | 1,092.0
Limited partners of Duncan Energy Partners other than EPO and its subsidiaries (prior to Duncan Merger) | 0 |  | 2.6 |  | 1.7
Joint venture partners | 6.6 |  | 5.9 |  | 2.8
Total | $ 6.6 |  | $ 8.5 |  | $ 1,096.5
[1] | Represents third party ownership interests in joint ventures that we consolidate, including Tri-States NGL Pipeline L.L.C., Independence Hub LLC, Rio Grande Pipeline Company and Wilprise Pipeline Company LLC.

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