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Related Party Transactions (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Revenues - related parties:          
Total revenue - related parties $ 6.7 $ 25.6 $ 12.6 $ 56.4  
Costs and expenses - related parties:          
Total costs and expenses - related parties 252.2 247.3 496.2 418.4  
Accounts receivable - related parties:          
Total accounts receivable - related parties 19.8   19.8   2.5
Accounts payable - related parties:          
Total accounts payable - related parties 142.0   142.0   127.1
Related Party Transactions [Abstract]          
Operating costs and expenses 224.2 221.5 438.4 369.9  
General and administrative expenses 28.0 25.8 57.8 48.5  
Relationship with Affiliates [Abstract]          
Number of Units Beneficially Owned (in units) 340,039,098 [1]   340,039,098 [1]    
Percentage of Total Units Outstanding (in hundredths) 37.00%   37.00%    
EPCO and affiliates [Member]
          
Costs and expenses - related parties:          
Total costs and expenses - related parties 222.9 240.1 435.6 406.1  
Accounts payable - related parties:          
Total accounts payable - related parties 116.3   116.3   102.4
Distributions:          
Total distributions     397.5 369.6  
Related Party Transactions [Abstract]          
Operating costs and expenses 193.1 213.6 374.2 356.3  
General and administrative expenses 29.8 26.5 61.4 49.8  
Relationship with Affiliates [Abstract]          
Percentage of Total Units Outstanding (in hundredths) 37.00%   37.00%    
Unconsolidated affiliates [Member]
          
Revenues - related parties:          
Total revenue - related parties 6.7 25.6 12.6 56.4  
Costs and expenses - related parties:          
Total costs and expenses - related parties 29.3 7.2 60.6 12.3  
Accounts receivable - related parties:          
Total accounts receivable - related parties 19.8   19.8   2.5
Accounts payable - related parties:          
Total accounts payable - related parties $ 25.7   $ 25.7   $ 24.7
[1] Includes 4,520,431 Class B units that converted to an equal number of distribution-bearing common units on August 8, 2013 (see Note 10).