Leases (Tables)

3 Months Ended

Mar. 31, 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		Three Months Ended
	March 31, 2020		March 31, 2019
Lease Cost included in the Condensed Consolidated Balance Sheets	(in millions)
Property, Plant and Equipment acquisitions(1)	$	4.4	$	4.7
	Three Months Ended		Three Months Ended
	March 31, 2020		March 31, 2019
Lease Cost included in the Condensed Consolidated Statement of Operations	(in millions)
Lease operating expense	$	2.5	$	3.1
Gathering and other expense	1.9		1.5
General and administrative	1.5		1.6
Total lease cost	$	10.3	$	10.9

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⁽¹⁾  Represents short-term lease capital expenditures related to drilling rigs for the three months ended March 31, 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:

	Three Months Ended		Three Months Ended
	March 31, 2020		March 31, 2019
Weighted-average remaining lease term (years)	4.3		3.8
Weighted-average discount rate	7.5	%	8.1	%

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

	March 31, 2020			December 31, 2019
Year	(in millions)
2020	$	17.0		$	22.3
2021	21.1			20.4
2022	16.3			15.9
2023	11.0			10.6
2024	1.7			1.4
After 2024	2.5			2.4
Less: Interest(1)	(8.8		)	(10.2		)
Present value of lease liabilities(2)	$	60.8		$	62.8