Derivatives - Fair Value of Assets and Liabilities (Details) - USD ($)	Mar. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Derivatives
Fair value of derivative assets—current	$ 4,100,000	$ 6,800,000
Fair value of derivative liabilities—current	(8,500,000)	(8,400,000)
Fair value of derivative liabilities	700,000		$ 0
EnLink Midstream Partners, LP
Derivatives
Fair value of derivative assets—current	4,100,000	6,800,000
Fair value of derivative liabilities—current	(8,500,000)	(8,400,000)
Fair value of derivative liabilities	700,000	0
Net fair value of derivatives	(5,100,000)	(1,600,000)
Fair value of derivative assets — long-term	$ 0	$ 0

Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, expected to be settled within one year or normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset.

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- Definition

Fair values as of the balance sheet date of the net amount of all assets and liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments.

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Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, expected to be settled after one year or the normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, expected to be settled within one year or normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset.

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