Acquisition (Textuals) (Details) (USD $) In Millions, except Share data, unless otherwise specified	6 Months Ended		0 Months Ended		0 Months Ended						6 Months Ended
	Jun. 30, 2014	Mar. 07, 2014	Mar. 07, 2014 Enlink Midstream, Inc. [Member]	Mar. 07, 2014 Enlink Midstream, Inc. [Member]	Mar. 07, 2014 EnLink Midstream Partners, LP [Member]	Mar. 07, 2014 EnLink Midstream Partners, LP [Member]	Jun. 30, 2014 Gulf Coast Fractionators	Mar. 07, 2014 Gulf Coast Fractionators	Mar. 07, 2014 E2 [Member] Enlink Midstream, Inc. [Member]	Mar. 07, 2014 E2 [Member] EnLink Midstream Partners, LP [Member]	Jun. 30, 2014 Enlink midstream, LLC	Jun. 30, 2014 Enlink Midstream, Inc. [Member]	Jun. 30, 2014 EnLink Midstream Partners GP, LLC [Member]
Business Acquisition [Line Items]
Held by public shareholders [Member]				48,000,000
Restricted Units				400,000		400,000
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares	115,495,669		48,400,000		92,600,000
Exchange Ratio		0
Conversion of Stock, Shares Converted			48,400,000
EMI common share price				$ 37.6		$ 0
Common units held by public unitholders						75,100,000
Preferred units held by third party						17,100,000
Partnership outstanding unit options value						$ 3.9
Total fair value of non-controlling interests									12.1	2,828.8
Business Acquisition, Transaction Costs		51.0
Business Acquisition, Date of Acquisition Agreement			Mar. 07, 2014
Business Acquisition, Percentage of Voting Interests Acquired		50.00%
Limited Liability Company (LLC) or Limited Partnership (LP), Members or Limited Partners, Ownership Interest											50.00%	7.00%	100.00%
Limited Liability Company (LLC) or Limited Partnership (LP), Managing Member or General Partner, Ownership Interest											100.00%	0.70%
Equity Method Investment, Ownership Percentage							38.75%	38.75%
Business Combination, Consideration Transferred			1,822.6		2,825.2
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net		1,834.7
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Less Noncontrolling Interest						$ 4,663.5
Exchange Ratio		1