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Related Party Transactions (Details) - Entity [Domain] - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Mar. 31, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Revenues - related parties:            
Total revenue - related parties $ 7.3   $ 17.3 $ 13.4 $ 52.8  
Costs and expenses - related parties:            
Total costs and expenses - related parties 295.2   285.5 556.3 577.8  
Accounts receivable - related parties:            
Total accounts receivable - related parties 2.4     2.4   $ 2.8
Accounts payable - related parties:            
Total accounts payable - related parties 115.5     115.5   118.9
Related Party Transactions [Abstract]            
Operating costs and expenses 267.1   256.7 499.2 518.8  
General and administrative expenses 28.1   28.8 $ 57.1 $ 59.0  
2013 At-the-Market Registration [Member]            
Relationship with Affiliates [Abstract]            
Number of common units issued (in units)       23,258,453 1,590,334  
EPCO and affiliates [Member]            
Costs and expenses - related parties:            
Total costs and expenses - related parties 236.0   239.5 $ 457.9 $ 475.2  
Accounts payable - related parties:            
Total accounts payable - related parties 91.7     91.7   98.1
Distributions:            
Total cash distributions       466.7 431.8  
Related Party Transactions [Abstract]            
Operating costs and expenses 205.8   208.9 396.9 412.6  
General and administrative expenses $ 30.2   30.6 $ 61.0 62.6  
Relationship with Affiliates [Abstract]            
Number of Units (in units) 689,490,269     689,490,269    
Percentage of Total Units Outstanding (in hundredths) 34.40%     34.40%    
EPCO and 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        
Unconsolidated affiliates [Member]            
Revenues - related parties:            
Total revenue - related parties $ 7.3   17.3 $ 13.4 52.8  
Costs and expenses - related parties:            
Total costs and expenses - related parties 59.2   $ 46.0 98.4 $ 102.6  
Accounts receivable - related parties:            
Total accounts receivable - related parties 2.4     2.4   2.8
Accounts payable - related parties:            
Total accounts payable - related parties $ 23.8     $ 23.8   $ 20.8