Related Party Transactions (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013		Mar. 31, 2012	Dec. 31, 2012
Revenues - related parties:
Total revenue - related parties	$ 5.9		$ 30.8
Costs and expenses - related parties:
Total costs and expenses - related parties	244.0		171.1
Accounts receivable - related parties:
Total accounts receivable - related parties	2.7			2.5
Accounts payable - related parties:
Total accounts payable - related parties	93.1			127.1
Related Party Transactions [Abstract]
Operating costs and expenses	214.2		148.4
General and administrative expenses	29.8		22.7
EPCO and affiliates [Member]
Costs and expenses - related parties:
Total costs and expenses - related parties	212.7		166.0
Accounts payable - related parties:
Total accounts payable - related parties	61.9			102.4
Distributions:
Total distributions	197.1		183.7
Related Party Transactions [Abstract]
Operating costs and expenses	181.1		142.7
General and administrative expenses	31.6		23.3
Relationship with Affiliates [Abstract]
Number of Units Beneficially Owned (in units)	339,604,069	[1]
Percentage of Total Units Outstanding (in hundredths)	37.10%
Unconsolidated affiliates [Member]
Revenues - related parties:
Total revenue - related parties	5.9		30.8
Costs and expenses - related parties:
Total costs and expenses - related parties	31.3		5.1
Accounts receivable - related parties:
Total accounts receivable - related parties	2.7			2.5
Accounts payable - related parties:
Total accounts payable - related parties	$ 31.2			$ 24.7

[1] Includes 4,520,431 Class B units.