Related Party Transactions (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Related Party Transaction [Line Items]
Accounts payable to related party	$ 12.5		$ 10.4
Devon Energy Corporation
Related Party Transaction [Line Items]
Accounts receivable balance	106.9		100.2
Accounts payable to related party	$ 11.8		$ 10.4
Devon Energy Corporation | Customer Concentration Risk | Sales Revenue, Net
Related Party Transaction [Line Items]
Concentration risk	14.90%	21.00%