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Fair Value Measurements (Tables)
 12 Months Ended
Dec. 31, 2017
Fair Value Disclosures [Abstract]  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis
The following table presents our assets and liabilities that are measured at fair value on a recurring basis as of December 31, 2017 and 2016. For additional discussion related to the fair value of the Company's derivatives, refer to Note 5 of these 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)
December 31, 2017
 
 
 
 
 
 
 
Assets
 
 
 
 
 
 
 
Natural Gas Derivatives
$
7.2

 
$
—

 
$
7.2

 
$
—

Natural Gas Basis Derivatives
$
0.3

 
$
—

 
$
0.3

 
$
—

NGL Derivatives
$
0.1

 
$
—

 
$
0.1

 
$
—

Liabilities
 
 
 
 
 
 
 
Natural Gas Derivatives
$
1.3

 
$
—

 
$
1.3

 
$
—

Natural Gas Basis Derivatives
$
0.3

 
$
—

 
$
0.3

 
$
—

Oil Derivatives
$
5.2

 
$
—

 
$
5.2

 
$
—

Oil Basis Derivatives
$
0.1

 
$
—

 
$
0.1

 
$
—

NGL Derivatives
$
0.9

 
$
—

 
$
0.9

 
$
—

 
 
 
 
 
 
 
 
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

 
$
—