Fair Value Measurements (Tables)

9 Months Ended

Sep. 30, 2020

Fair Value Disclosures [Abstract]

Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]

The following table presents our assets and liabilities that are measured on a recurring basis at fair value as of each of September 30, 2020 and December 31, 2019, and are categorized using the fair value hierarchy. For additional discussion related to the fair value of the Company's derivatives, refer to Note 8 of these Notes to Condensed Consolidated Financial Statements.

	Fair Value Measurements at
(in millions)	Total		Quoted Prices in Active markets for Identical Assets (Level 1)		Significant Other Observable Inputs  (Level 2)		Significant Unobservable Inputs (Level 3)
September 30, 2020
Assets
Natural Gas Derivatives	$	0.3	$	—	$	0.3	$	—
Natural Gas Basis Derivatives	$	3.0	$	—	$	3.0	$	—
Oil Derivatives	$	10.0	$	—	$	10.0	$	—
Oil Basis Derivatives	$	0.8	$	—	$	0.8	$	—
Liabilities
Natural Gas Derivatives	$	10.7	$	—	$	10.7	$	—
Natural Gas Basis Derivatives	$	0.1	$	—	$	0.1	$	—
Oil Derivatives	$	3.4	$	—	$	3.4	$	—
Oil Basis Derivatives	$	0.2	$	—	$	0.2	$	—
December 31, 2019
Assets
Natural Gas Derivatives	$	11.7	$	—	$	11.7	$	—
Natural Gas Basis Derivatives	$	3.4	$	—	$	3.4	$	—
Oil Derivatives	$	1.6	$	—	$	1.6	$	—
Liabilities
Natural Gas Derivatives	$	0.2	$	—	$	0.2	$	—
Natural Gas Basis Derivatives	$	0.9	$	—	$	0.9	$	—
Oil Derivatives	$	7.0	$	—	$	7.0	$	—
Oil Basis Derivatives	$	0.1	$	—	$	0.1	$	—