Related Party Transactions (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Revenues - related parties:
Total revenue - related parties	$ 7.7	$ 7.5	$ 20.3	$ 63.9
Costs and expenses - related parties:
Total costs and expenses - related parties	244.7	225.8	740.9	644.2
Accounts receivable - related parties:
Total accounts receivable - related parties	12.8		12.8		2.5
Accounts payable - related parties:
Total accounts payable - related parties	96.5		96.5		127.1
Related Party Transactions [Abstract]
Operating costs and expenses	218.2	203.2	656.6	573.1
General and administrative expenses	26.5	22.6	84.3	71.1
EPCO and affiliates [Member]
Costs and expenses - related parties:
Total costs and expenses - related parties	218.8	210.8	654.4	616.9
Accounts payable - related parties:
Total accounts payable - related parties	86.2		86.2		102.4
Distributions:
Total distributions			601.2	557.7
Related Party Transactions [Abstract]
Operating costs and expenses	190.5	185.3	564.7	541.6
General and administrative expenses	28.3	25.5	89.7	75.3
Relationship with Affiliates [Abstract]
Number of Units Beneficially Owned (in units)	340,462,655		340,462,655
Percentage of Total Units Outstanding (in hundredths)	36.80%		36.80%
Unconsolidated affiliates [Member]
Revenues - related parties:
Total revenue - related parties	7.7	7.5	20.3	63.9
Costs and expenses - related parties:
Total costs and expenses - related parties	25.9	15.0	86.5	27.3
Accounts receivable - related parties:
Total accounts receivable - related parties	12.8		12.8		2.5
Accounts payable - related parties:
Total accounts payable - related parties	$ 10.3		$ 10.3		$ 24.7