Income Taxes (Narrative) (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014	Mar. 07, 2014
Operating Loss Carryforwards [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired		50.00%
Business acquisition, deferred tax liability, assumed in business acquisition		$ 252.0
Business Acquisition, Deferred tax liability, Percentage of total assumed		53.00%
Operating Loss Carryforwards	61.9
Deferred Tax Assets, Operating Loss Carryforwards, State and Local	75.4
Noncontrolling Interest
Operating Loss Carryforwards [Line Items]
Business acquisition, deferred tax liability, assumed in business acquisition		$ 215.5
Business Acquisition, Deferred tax liability, Percentage of total assumed		47.00%
Enlink midstream, LLC
Operating Loss Carryforwards [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired		50.00%
EnLink Midstream Holdings, LP [Member]
Operating Loss Carryforwards [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired		50.00%
Business Acquisition, Additional Percentage of Voting Interests Acquired		3.00%