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