Business Acquisitions (Details) - Eagle Ford Midstream Assets [Member] - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2015	Sep. 30, 2015
Business Acquisition
Description of acquisition		The EFS Midstream system includes approximately 460 miles of natural gas and condensate gathering pipelines, ten central gathering plants, 780 MMcf/d of natural gas treating capacity and 119 MBPD of condensate stabilization capacity.
Revenues from acquired assets	$ 56.7
Net income from acquired assets	$ 23.8

With respect to a business combination completed during the period, this element provides a description of the business, other than the name, which may include the industry, size, products and other important information.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=56956515&loc=d3e1392-128463

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration