Earnings per Unit and Dilution Computations (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Capital Unit [Line Items]
Distribution paid (usd per unit)	$ 0.245	$ 0.18
Enlink Midstream, LLC interest in net income	$ 16.3enlc_NetIncomeAttributableToENLC	$ 6.8enlc_NetIncomeAttributableToENLC
Distributed Earnings	40.4us-gaap_DistributedEarnings	14.6us-gaap_DistributedEarnings
Undistributed Earnings, Basic	(24.1)us-gaap_UndistributedEarnings	(7.8)us-gaap_UndistributedEarnings
Basic common unit (usd per unit)	$ 0.10us-gaap_EarningsPerShareBasic	$ 0.04us-gaap_EarningsPerShareBasic
Diluted common unit (usd per unit)	$ 0.10us-gaap_EarningsPerShareDiluted	$ 0.04us-gaap_EarningsPerShareDiluted
Common Unit
Capital Unit [Line Items]
Enlink Midstream, LLC interest in net income	16.2	6.7
Distributed Earnings	40.2	14.5
Undistributed Earnings, Basic	(24.0)	(7.8)
Restricted Stock Units (RSUs)
Capital Unit [Line Items]
Enlink Midstream, LLC interest in net income	0.1	0.1
Distributed Earnings	0.2	0.1
Undistributed Earnings, Basic	$ (0.1)	$ 0
Capital Unit, Class B [Member]
Capital Unit [Line Items]
Distribution paid (usd per unit)		$ 0.05

Net income (loss) attributable to the company.

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The total amount of dividends declared in the period for each class of stock and the contractual amount of dividends (or interest on participating income bonds) that must be paid for the period (for example, unpaid cumulative dividends). Dividends declared in the current period do not include dividends declared in respect of prior-period unpaid cumulative dividends. Preferred dividends that are cumulative only if earned are deducted only to the extent that they are earned.

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Per unit of ownership amount of cash distributions declared to unit-holder of a limited liability company (LLC).

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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