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Equity and Distributions, Noncontrolling Interests (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Components of net income attributable to noncontrolling interests |  |  |
Limited partners of Oiltanking other than EPO | $ 0.0 | $ 7.8 | $ 14.2
Joint venture partners | 39.9 | 29.4 | 31.9
Total | 39.9 | 37.2 | 46.1
Cash distributions paid to noncontrolling interests: |  |  |
Limited partners of Oiltanking other than EPO | 0.0 | 8.1 | 7.7
Joint venture partners | 47.4 | 39.9 | 40.9
Total | 47.4 | 48.0 | 48.6
Cash contributions from noncontrolling interests: |  |  |
Joint venture partners | $ 20.4 | 54.0 | $ 4.0
Panola Pipeline Company, LLC [Member] |  |  |
Noncontrolling Interest |  |  |
Noncontrolling Interest, Ownership Percentage by Parent | 55.00% |  |
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners | 45.00% |  |
Oiltanking Partners L.P. [Member] |  |  |
Noncontrolling Interest |  |  |
Noncontrolling interests acquired |  | $ 1,400.0 |
Anadarko Petroleum Corporation [Member] | Panola Pipeline Company, LLC [Member] |  |  |
Noncontrolling Interest |  |  |
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners | 15.00% |  |
DCP Midstream Partners, LP [Member] | Panola Pipeline Company, LLC [Member] |  |  |
Noncontrolling Interest |  |  |
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners | 15.00% |  |
MarkWest Energy Partners, L.P. [Member] | Panola Pipeline Company, LLC [Member] |  |  |
Noncontrolling Interest |  |  |
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners | 15.00% |  |

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