Transactions with Affiliates (Details) - Commercial Agreements with OPNA, Oasis Petroleum Marketing LLC (“OPM”) and OMS - Oasis - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 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	$ 7.9	$ 6.8	$ 23.6	$ 21.6
Interest expense, net		$ 0.1		$ 0.4