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Equity and Distributions, Issuances of Equity (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Nov. 06, 2015
Mar. 31, 2015
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Jun. 30, 2015
Net Cash Proceeds from Sale of Common Units [Abstract]            
Net cash proceeds from the issuance of common units     $ 1,011.4 $ 304.9    
Oiltanking Partners L.P. [Member]            
Description of Business Combination:            
Limited partner interests acquired (in hundredths)         65.90%  
Oiltanking Acquisition [Member]            
Description of Business Combination:            
Total consideration for acquisition     $ 5,900.0      
Oiltanking Partners L.P. - Step 1 [Member]            
Description of Business Combination:            
Total consideration for acquisition         $ 4,410.0  
Oiltanking Partners L.P. - Step 2 [Member]            
Description of Business Combination:            
Common units exchanged for each Oiltanking unit (in units)     1.3      
Common units issued in connection with acquisition of Oiltanking (in units)     36,827,517      
Distribution Reinvestment Plan [Member]            
Registration Statements and Equity Offerings [Line Items]            
Maximum common units authorized for issuance (in units)     140,000,000      
Remaining units available for issuance (in units)     19,516,031      
Net Cash Proceeds from Sale of Common Units [Abstract]            
Number of common units issued (in units)     7,965,318 7,148,778    
Net cash proceeds from the issuance of common units     $ 242.8 $ 239.8    
Distribution Reinvestment Plan [Member] | EPCO and its privately held affiliates [Member]            
Net Cash Proceeds from Sale of Common Units [Abstract]            
Net cash proceeds from the issuance of common units $ 50.0   $ 50.0 $ 75.0    
Employee Unit Purchase Plan [Member]            
Registration Statements and Equity Offerings [Line Items]            
Maximum common units authorized for issuance (in units)     8,000,000      
Remaining units available for issuance (in units)     6,867,071      
Net Cash Proceeds from Sale of Common Units [Abstract]            
Number of common units issued (in units)     285,997 207,126    
Net cash proceeds from the issuance of common units     $ 8.9 $ 7.4    
2015 At-the-Market Registration [Member]            
Registration Statements and Equity Offerings [Line Items]            
Maximum common units authorized for issuance     1,920.0      
Remaining units available for issuance     $ 1,920.0      
2013 At-the-Market Registration [Member]            
Registration Statements and Equity Offerings [Line Items]            
Maximum common units authorized for issuance           $ 1,250.0
Remaining units available for issuance           $ 424.6
Net Cash Proceeds from Sale of Common Units [Abstract]            
Number of common units issued (in units)     23,258,453 1,590,334    
Gross proceeds from the sale of common units     $ 767.1 $ 58.3    
Net cash proceeds from the issuance of common units     $ 759.7 $ 57.7    
2013 At-the-Market Registration [Member] | EPCO and its privately held affiliates [Member]            
Net Cash Proceeds from Sale of Common Units [Abstract]            
Number of common units issued (in units)   3,225,057 3,225,057      
Net cash proceeds from the issuance of common units     $ 100.0