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Equity and Distributions, Issuances of Equity (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Net Cash Proceeds from Sale of Common Units [Abstract]    
Net cash proceeds from the issuance of common units $ 877.2 $ 2,170.4
Common units issued in connection with employee compensation $ 33.7  
Long-Term Incentive Plan (2008) [Member]    
Net Cash Proceeds from Sale of Common Units [Abstract]    
Common units issued in connection with employee compensation (in units) 1,176,103  
Common units issued in connection with employee compensation $ 33.7  
Universal Shelf Registration [Member]    
Registration Statements and Equity Offerings [Line Items]    
Debt issued under universal shelf registration 1,700.0  
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 $ 838.6  
Net Cash Proceeds from Sale of Common Units [Abstract]    
Number of common units issued (in units) 21,807,726 76,113,492
Gross proceeds from the sale of common units $ 603.1 $ 1,870.0
Net cash proceeds from the issuance of common units $ 597.3 $ 1,850.0
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) 88,912,840  
Net Cash Proceeds from Sale of Common Units [Abstract]    
Number of common units issued (in units) 10,345,655 12,946,724
Net cash proceeds from the issuance of common units $ 269.9 $ 306.2
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) 5,900,541  
Net Cash Proceeds from Sale of Common Units [Abstract]    
Number of common units issued (in units) 364,934 387,834
Net cash proceeds from the issuance of common units $ 10.0 $ 9.8