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Equity and Distributions, Noncontrolling Interests (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Components of noncontrolling interests [Abstract] |  |  |
Joint venture partners | $ 225.6 | $ 108.3 |
Components of net income attributable to noncontrolling interests [Abstract] |  |  |
Limited partners of Duncan Energy Partners other than EPO and its subsidiaries (prior to Duncan Merger) | 0 | 0 | 20.9
Joint venture partners | 10.2 | 8.1 | 20.5
Total | 10.2 | 8.1 | 41.4
Cash distributions paid to noncontrolling interests: |  |  |
Limited partners of Duncan Energy Partners other than EPO and its subsidiaries (prior to Duncan Merger) | 0 | 0 | 32.9
Joint venture partners | 8.9 | 13.3 | 27.8
Total | 8.9 | 13.3 | 60.7
Cash contributions from noncontrolling interests: |  |  |
Limited partners of Duncan Energy Partners other than EPO and its subsidiaries (prior to Duncan Merger) | 0 | 0 | 2.6
Joint venture partners | 115.4 | 6.6 | 5.9
Total | $ 115.4 | $ 6.6 | $ 8.5

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