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Equity and Distributions, Noncontrolling Interests (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Components of net income attributable to noncontrolling interests |  |  |
Limited partners of Oiltanking other than EPO | $ 0.0 | $ 0.0 | $ 7.8
Joint venture partners | 56.3 | 39.9 | 29.4
Total | 56.3 | 39.9 | 37.2
Cash distributions paid to noncontrolling interests: |  |  |
Limited partners of Oiltanking other than EPO | 0.0 | 0.0 | 8.1
Joint venture partners | 49.2 | 47.4 | 39.9
Total | 49.2 | 47.4 | 48.0
Cash contributions from noncontrolling interests: |  |  |
Joint venture partners | $ 0.4 | $ 20.4 | 54.0
Oiltanking Partners L.P. [Member] |  |  |
Noncontrolling Interest |  |  |
Noncontrolling interests acquired |  |  | $ 1,400.0

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