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Fair Value Measurements (Tables)
 6 Months Ended
Jun. 30, 2017
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 June 30, 2017 and December 31, 2016 and are categorized using the fair value hierarchy. For additional discussion related to the fair value of the Company's derivatives, refer to Note 7 of these 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, 2017
 
 
 
 
 
 
 
Assets
 
 
 
 
 
 
 
  Natural Gas Derivatives
$
3.4

 
$
—

 
$
3.4

 
$
—

Natural Gas Basis Derivatives
$
0.1

 
$
—

 
$
0.1

 
$
—

   Oil Derivatives
$
0.9

 
$
—

 
$
0.9

 
$
—

Liabilities
 
 
 
 
 
 
 
   Natural Gas Derivatives
$
1.7

 
$
—

 
$
1.7

 
$
—

   Natural Gas Basis Derivatives
$
1.3

 
$
—

 
$
1.3

 
$
—

 
 
 
 
 
 
 
 
December 31, 2016
 
 
 
 
 
 
 
Assets
 
 
 
 
 
 
 
Natural Gas Basis Derivatives
$
0.4

 
$
—

 
$
0.4

 
$
—

Liabilities
 
 
 
 
 
 
 
Natural Gas Derivatives
$
13.7

 
$
—

 
$
13.7

 
$
—

Natural Gas Basis Derivatives
$
0.1

 
$
—

 
$
0.1

 
$
—

Oil Derivatives
$
3.0

 
$
—

 
$
3.0

 
$
—