Fair Value Measurements - Recurring (Details) - Commodity Swaps - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Fair Value
Fair Value	$ 8.5
EnLink Midstream Partners, LP
Fair Value
Fair Value	8.5	$ (1.6)
EnLink Midstream Partners, LP \| Level 2 \| Recurring
Fair Value
Fair Value	$ 8.5	$ (1.6)

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.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant