Equity-Based Awards, Unit Option Awards (Details) - Unit Option Awards [Member] - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2015	Sep. 30, 2015
Options outstanding, weighted-average strike price [Roll Forward]
Total intrinsic value of unit option awards exercised during period	$ 0.2	$ 19.8
Cash received from EPCO in connection with the exercise of unit option awards	0.2	11.5
Unit option award-related cash reimbursements to EPCO	$ 0.2	$ 19.8

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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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration