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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, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2013
Revenues - related parties:          
Total revenue - related parties $ 17.3 $ 6.7 $ 52.8 $ 12.6  
Costs and expenses - related parties:          
Total costs and expenses - related parties 285.5 252.2 577.8 496.2  
Accounts receivable - related parties:          
Total accounts receivable - related parties 56.3   56.3   6.8
Accounts payable - related parties:          
Total accounts payable - related parties 114.0   114.0   150.5
Related Party Transactions [Abstract]          
Operating costs and expenses 256.7 224.2 518.8 438.4  
General and administrative expenses 28.8 28.0 59.0 57.8  
EPCO and affiliates [Member]
          
Costs and expenses - related parties:          
Total costs and expenses - related parties 239.5 222.9 475.2 435.6  
Accounts payable - related parties:          
Total accounts payable - related parties 101.9   101.9   116.3
Distributions:          
Total cash distributions     431.8 397.5  
Related Party Transactions [Abstract]          
Operating costs and expenses 208.9 193.1 412.6 374.2  
General and administrative expenses 30.6 29.8 62.6 61.4  
Relationship with Affiliates [Abstract]          
Number of Units (in units) 341,641,866   341,641,866    
Percentage of Total Units Outstanding (in hundredths) 36.40%   36.40%    
Unconsolidated affiliates [Member]
          
Revenues - related parties:          
Total revenue - related parties 17.3 6.7 52.8 12.6  
Costs and expenses - related parties:          
Total costs and expenses - related parties 46.0 29.3 102.6 60.6  
Accounts receivable - related parties:          
Total accounts receivable - related parties 56.3   56.3   6.8
Accounts payable - related parties:          
Total accounts payable - related parties $ 12.1   $ 12.1   $ 34.2