Equity-based Awards, Unit Option Awards (Details) - Unit Option Awards [Member] $ in Millions	3 Months Ended
Mar. 31, 2015 USD ($)
Options outstanding, weighted-average strike price [Roll Forward]
Total intrinsic value of unit option awards exercised during period	$ 17.4
Cash received from EPCO in connection with the exercise of unit option awards	10.1
Unit option award-related cash reimbursements to EPCO	$ 17.4

Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (d)(2)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration