Leases Lease Cost (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Lessor, Lease, Description [Line Items]
Lease, Cost	$ 8.9	$ 8.7	$ 28.2	$ 30.6
Operating Lease, Weighted Average Remaining Lease Term	3 years 6 months	3 years 4 months 24 days	3 years 6 months	3 years 4 months 24 days
Operating Lease, Weighted Average Discount Rate, Percent	7.20%	7.70%	7.20%	7.70%
Property, Plant and Equipment [Member]
Lessor, Lease, Description [Line Items]
Lease, Cost	$ 2.1	$ 2.5	$ 9.2	$ 11.3
Lease Operating Expense [Member]
Lessor, Lease, Description [Line Items]
Lease, Cost	3.4	2.9	8.8	9.0
Gathering and other expense [Member]
Lessor, Lease, Description [Line Items]
Lease, Cost	1.9	2.0	5.7	5.8
General and Administrative Expense [Member]
Lessor, Lease, Description [Line Items]
Lease, Cost	$ 1.5	$ 1.3	$ 4.5	$ 4.5