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Fair Value Measurements (Tables)
 6 Months Ended
Jun. 30, 2019
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 June 30, 2019 and December 31, 2018, 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)
June 30, 2019
 
 
 
 
 
 
 
Assets
 
 
 
 
 
 
 
Natural Gas Derivatives
$
13.9

 
$
—

 
$
13.9

 
$
—

Natural Gas Basis Derivatives
$
5.8

 
$
—

 
$
5.8

 
$
—

Oil Derivatives
$
4.4

 
$
—

 
$
4.4

 
$
—

Oil Basis Derivatives
$
0.1

 
$
—

 
$
0.1

 
$
—

NGL Derivatives
$
3.4

 
$
—

 
$
3.4

 
$
—

Liabilities
 
 
 
 
 
 
 
Natural Gas Derivatives
$
0.3

 
$
—

 
$
0.3

 
$
—

Natural Gas Basis Derivatives
$
0.6

 
$
—

 
$
0.6

 
$
—

Oil Derivatives
$
2.1

 
$
—

 
$
2.1

 
$
—

December 31, 2018
 
 
 
 
 
 
 
Assets
 
 
 
 
 
 
 
Natural Gas Derivatives
$
7.5

 
$
—

 
$
7.5

 
$
—

Natural Gas Basis Derivatives
$
0.4

 
$
—

 
$
0.4

 
$
—

Oil Derivatives
$
6.9

 
$
—

 
$
6.9

 
$
—

NGL Derivatives
$
4.7

 
$
—

 
$
4.7

 
$
—

Liabilities
 
 
 
 
 
 
 
Natural Gas Derivatives
$
1.0

 
$
—

 
$
1.0

 
$
—

Natural Gas Basis Derivatives
$
5.3

 
$
—

 
$
5.3

 
$
—

NGL Derivatives
$
0.2

 
$
—

 
$
0.2

 
$
—