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Equity and Distributions, Issuances of Equity (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Net Cash Proceeds from Sale of Common Units [Abstract]    
Net cash proceeds from the issuance of common units $ 448.8 $ 1,011.5
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 $ 1,080.0  
Net Cash Proceeds from Sale of Common Units [Abstract]    
Number of common units issued (in units) 12,865,371 35,396,147
Gross proceeds from the sale of common units $ 359.7 $ 856.5
Net cash proceeds from the issuance of common units $ 356.0 $ 849.0
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
Gross proceeds from the sale of common units   $ 100.0
Distribution Reinvestment Plan [Member]    
Registration Statements and Equity Offerings [Line Items]    
Maximum common units authorized for issuance (in units)   240,000,000
Remaining units available for issuance (in units) 95,932,697  
Net Cash Proceeds from Sale of Common Units [Abstract]    
Number of common units issued (in units) 3,325,798 7,162,744
Net cash proceeds from the issuance of common units $ 89.6 $ 159.8
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   $ 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) 6,150,714  
Net Cash Proceeds from Sale of Common Units [Abstract]    
Number of common units issued (in units) 114,761 119,262
Net cash proceeds from the issuance of common units $ 3.2 $ 2.7