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Related Party Transactions (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Revenues - related parties:          
Total revenue - related parties $ 11.0 $ 7.7 $ 63.8 $ 20.3  
Costs and expenses - related parties:          
Total costs and expenses - related parties 248.6 244.7 826.4 740.9  
Accounts receivable - related parties:          
Total accounts receivable - related parties 2.6   2.6   6.8
Accounts payable - related parties:          
Total accounts payable - related parties 122.6   122.6   150.5
Related Party Transactions [Abstract]          
Operating costs and expenses 216.7 218.2 735.5 656.6  
General and administrative expenses 31.9 26.5 90.9 84.3  
EPCO and affiliates [Member]
          
Costs and expenses - related parties:          
Total costs and expenses - related parties 212.8 218.8 688.0 654.4  
Accounts payable - related parties:          
Total accounts payable - related parties 102.3   102.3   116.3
Distributions:          
Total cash distributions     652.8 601.2  
Related Party Transactions [Abstract]          
Operating costs and expenses 179.1 190.5 591.7 564.7  
General and administrative expenses 33.7 28.3 96.3 89.7  
Relationship with Affiliates [Abstract]          
Number of Units (in units) 683,993,630   683,993,630    
Percentage of Total Units Outstanding (in hundredths) 36.40%   36.40%    
Unconsolidated affiliates [Member]
          
Revenues - related parties:          
Total revenue - related parties 11.0 7.7 63.8 20.3  
Costs and expenses - related parties:          
Total costs and expenses - related parties 35.8 25.9 138.4 86.5  
Accounts receivable - related parties:          
Total accounts receivable - related parties 2.6   2.6   6.8
Accounts payable - related parties:          
Total accounts payable - related parties $ 20.3   $ 20.3   $ 34.2