Equity and Distributions, Noncontrolling Interests (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Components of noncontrolling interests
Limited partners of Oiltanking other than EPO	$ 0.0	$ 1,408.9
Joint venture partners	206.0	220.1
Total	206.0	1,629.0
Components of net income attributable to noncontrolling interests
Limited partners of Oiltanking other than EPO	7.8	14.2	$ 0.0
Joint venture partners	29.4	31.9	10.2
Total	37.2	46.1	10.2
Cash distributions paid to noncontrolling interests:
Limited partners of Oiltanking other than EPO	8.1	7.7	0.0
Joint venture partners	39.9	40.9	8.9
Total	48.0	48.6	8.9
Cash contributions from noncontrolling interests:
Joint venture partners	$ 54.0	$ 4.0	$ 115.4
Panola Pipeline Company, LLC [Member]
Noncontrolling Interest
Noncontrolling Interest, Ownership Percentage by Parent (in hundredths)	55.00%
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners (in hundredths)	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 (in hundredths)	15.00%
DCP Midstream Partners, LP [Member] \| Panola Pipeline Company, LLC [Member]
Noncontrolling Interest
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners (in hundredths)	15.00%
MarkWest Energy Partners, L.P. [Member] \| Panola Pipeline Company, LLC [Member]
Noncontrolling Interest
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners (in hundredths)	15.00%

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