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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%