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Equity and Distributions, Issuances of Equity (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Mar. 31, 2016
Net Cash Proceeds from Sale of Common Units [Abstract]      
Net cash proceeds from the issuance of common units $ 2,170.4 $ 1,011.4  
At-the-Market Registration [Member]      
Registration Statements and Equity Offerings [Line Items]      
Maximum common units authorized for issuance 1,890.0    
Remaining units available for issuance $ 1,750.0    
Net Cash Proceeds from Sale of Common Units [Abstract]      
Number of common units issued (in units) 76,113,492 23,258,453  
Gross proceeds from the sale of common units $ 1,870.0 $ 767.1  
Net cash proceeds from the issuance of common units $ 1,850.0 $ 759.7  
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) 3,830,256 3,225,057  
Gross proceeds from the sale of common units $ 100.0 $ 100.0  
Distribution Reinvestment Plan [Member]      
Registration Statements and Equity Offerings [Line Items]      
Maximum common units authorized for issuance (in units) 240,000,000   140,000,000
Remaining units available for issuance (in units) 102,121,274    
Net Cash Proceeds from Sale of Common Units [Abstract]      
Number of common units issued (in units) 12,946,724 7,965,318  
Net cash proceeds from the issuance of common units $ 306.2 $ 242.8  
Distribution Reinvestment Plan [Member] | EPCO and its privately held affiliates [Member]      
Net Cash Proceeds from Sale of Common Units [Abstract]      
Number of common units issued (in units) 4,481,504    
Net cash proceeds from the issuance of common units $ 100.0    
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) 6,384,672    
Net Cash Proceeds from Sale of Common Units [Abstract]      
Number of common units issued (in units) 387,834 285,997  
Net cash proceeds from the issuance of common units $ 9.8 $ 8.9