Leases Lease Cost (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Lessor, Lease, Description [Line Items]
Lease, Cost	$ 9.0	$ 11.0	$ 19.3	$ 21.9
Operating Lease, Weighted Average Remaining Lease Term	4 years	3 years 7 months 6 days	4 years	3 years 7 months 6 days
Operating Lease, Weighted Average Discount Rate, Percent	8.60%	7.70%	8.60%	7.70%
Property, Plant and Equipment [Member]
Lessor, Lease, Description [Line Items]
Lease, Cost	$ 2.7	$ 4.1	$ 7.1	$ 8.8
Lease Operating Expense [Member]
Lessor, Lease, Description [Line Items]
Lease, Cost	2.9	3.0	5.4	6.1
Gathering and other expense [Member]
Lessor, Lease, Description [Line Items]
Lease, Cost	1.9	2.3	3.8	3.8
General and Administrative Expense [Member]
Lessor, Lease, Description [Line Items]
Lease, Cost	$ 1.5	$ 1.6	$ 3.0	$ 3.2