Transactions with Affiliates (Details) - Commercial Agreements with OPNA, Oasis Petroleum Marketing LLC (“OPM”) and OMS - Oasis - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Related Party Transaction [Line Items]
Term of contractual arrangements			15 years
Centralized Corporate, General and Administrative Services
Related Party Transaction [Line Items]
Term of contractual arrangements			15 years
General and administrative	$ 8.1	$ 7.0	$ 15.7	$ 14.8
Interest expense, net		$ 0.1		$ 0.3