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Related Party Transactions (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 9 Months Ended
Nov. 06, 2015
Sep. 30, 2015
Mar. 31, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Revenues - related parties:              
Total revenue - related parties   $ 13.9   $ 11.0 $ 27.3 $ 63.8  
Costs and expenses - related parties:              
Total costs and expenses - related parties   312.9   248.6 869.2 826.4  
Accounts receivable - related parties:              
Total accounts receivable - related parties   1.7     1.7   $ 2.8
Accounts payable - related parties:              
Total accounts payable - related parties   80.3     80.3   118.9
Related Party Transactions [Abstract]              
Operating costs and expenses   284.7   216.7 783.9 735.5  
General and administrative expenses   28.2   31.9 85.3 90.9  
Relationship with Affiliates [Abstract]              
Net cash proceeds from the issuance of common units         $ 1,011.4 $ 304.9  
2013 At-the-Market Registration [Member]              
Relationship with Affiliates [Abstract]              
Number of common units issued (in units)         23,258,453 1,590,334  
Net cash proceeds from the issuance of common units         $ 759.7 $ 57.7  
Distribution Reinvestment Plan [Member]              
Relationship with Affiliates [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  
EPCO and its privately held affiliates [Member]              
Costs and expenses - related parties:              
Total costs and expenses - related parties   246.0   212.8 703.9 688.0  
Accounts payable - related parties:              
Total accounts payable - related parties   $ 64.6     64.6   98.1
Distributions:              
Total cash distributions         $ 705.9 $ 652.8  
Relationship with Affiliates [Abstract]              
Total Number of Units (in units)   675,259,617     675,259,617    
Percentage of Total Units Outstanding (in hundredths)   33.70%     33.70%    
Number of Designated Units excluded from distributions (in units)         35,380,000 45,120,000  
Enterprise common units pledged as security (in units)   118,000,000     118,000,000    
EPCO and its privately held affiliates [Member] | 2013 At-the-Market Registration [Member]              
Relationship with Affiliates [Abstract]              
Number of common units issued (in units)     3,225,057   3,225,057    
Offering price of common unit (in dollars per unit)     $ 31.01        
Net cash proceeds from the issuance of common units         $ 100.0    
EPCO and its privately held affiliates [Member] | Distribution Reinvestment Plan [Member]              
Relationship with Affiliates [Abstract]              
Net cash proceeds from the issuance of common units $ 50.0       50.0 $ 75.0  
EPCO and its privately held affiliates [Member] | Administrative Services Agreement [Member]              
Costs and expenses - related parties:              
Total costs and expenses - related parties   $ 241.7   208.6 691.0 676.1  
Related Party Transactions [Abstract]              
Operating costs and expenses   215.3   179.0 612.2 591.6  
General and administrative expenses   26.4   29.6 78.8 84.5  
Unconsolidated affiliates [Member]              
Revenues - related parties:              
Total revenue - related parties   13.9   11.0 27.3 63.8  
Costs and expenses - related parties:              
Total costs and expenses - related parties   66.9   $ 35.8 165.3 $ 138.4  
Accounts receivable - related parties:              
Total accounts receivable - related parties   1.7     1.7   2.8
Accounts payable - related parties:              
Total accounts payable - related parties   $ 15.7     $ 15.7   $ 20.8