Related Party Transactions (Details) - USD ($) $ in Millions					3 Months Ended
		Jan. 31, 2019	Jan. 25, 2019	Jul. 18, 2018	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Related Party Transaction [Line Items]
Business acquisition, equity interest issued or issuable, number of shares (in shares)			304,822,035
Cost of sales	[1]				$ 1,363.4	$ 1,381.5
Accounts payable to related party					2.6		$ 4.3
Devon Energy Corporation | Customer Concentration Risk | Sales Revenue, Net
Related Party Transaction [Line Items]
Concentration risk						9.80%
Cedar Cove Joint Venture
Related Party Transaction [Line Items]
Cost of sales					8.1	$ 13.0
Accounts receivable balance					0.4		0.7
Accounts payable to related party					$ 2.6		$ 4.3
EnLink Midstream Partners, LP
Related Party Transaction [Line Items]
Business acquisition, equity interest issued or issuable, number of shares (in shares)		55,827,221
EnLink Oklahoma T.O.
Related Party Transaction [Line Items]
Noncontrolling interest, ownership percentage by parent		16.10%
GIP | Devon Energy Corporation
Related Party Transaction [Line Items]
Consideration				$ 3,125.0

[1] Includes related party cost of sales of $8.1 million and $34.1 million for the three months ended March 31, 2019 and 2018, respectively