Leases (Tables)

9 Months Ended

Sep. 30, 2020

Leases [Abstract]

Lease, Cost [Table Text Block]

Lease costs represent the straight-line lease expense of ROU assets and short-term leases. The components of lease cost are classified as follows:

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2020		2019		2020		2019
Lease Cost included in the Condensed Consolidated Balance Sheets	(in millions)
Property, Plant and Equipment acquisitions(1)	$	2.1	$	2.5	$	9.2	$	11.3
	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2020		2019		2020		2019
Lease Cost included in the Condensed Consolidated Statement of Operations	(in millions)
Lease operating expense	$	3.4	$	2.9	$	8.8	$	9.0
Gathering and other expense	1.9		2.0		5.7		5.8
General and administrative	1.5		1.3		4.5		4.5
Total lease cost	$	8.9	$	8.7	$	28.2	$	30.6

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(1)Represents short-term lease capital expenditures related to drilling rigs for the three and nine months ended September 30, 2020 and 2019. These costs are capitalized as a part of "Proved properties" on the balance sheets.

Lessee, Operating Leases [Text Block]

Lease term and discount rate related to the Company's leases are as follows:

	September 30, 2020		September 30, 2019
Weighted-average remaining lease term (years)	3.5		3.4
Weighted-average discount rate	7.2	%	7.7	%

Lessee, Operating Lease, Liability, Maturity [Table Text Block]

	September 30, 2020		December 31, 2019
Year	(in millions)
2020	$	6.8	$	22.3
2021	25.0		20.4
2022	17.0		15.9
2023	11.4		10.6
2024	2.3		1.4
After 2024	2.6		2.4
Less: Interest(1)	(7.1)		(10.2)
Present value of lease liabilities(2)	$	58.0	$	62.8