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Fair Value Measurements (Tables)
 12 Months Ended
Dec. 31, 2015
Fair Value Disclosures [Abstract]  
Schedule of assets and liabilities that are recognized at fair value on a recurring basis
The following table presents assets and liabilities included in our consolidated balance sheets that are recognized at fair value on a recurring basis, and indicate the fair value hierarchy utilized to determine such fair value as of December 31, 2015 and 2014:
 
Balances as of December 31, 2015
 
Total
 
Quoted Market
Prices in Active
Markets
(Level 1)
 
Significant Other
Observable
Inputs
(Level 2)
 
Significant Unobservable Inputs (Level 3)
 
(in millions)
Cash and cash equivalents
$
106.4

 
$
106.4

 
$
—

 
$
—

Total assets at fair value
$
106.4

 
$
106.4

 
$
—

 
$
—

Unrealized losses on natural gas derivatives
(27.9
)
 
—

 
(27.9
)
 
—

Total liabilities at fair value
$
(27.9
)
 
$
—

 
$
(27.9
)
 
$
—

 
Balances as of December 31, 2014
 
Total
 
Quoted Market
Prices in Active
Markets
(Level 1)
 
Significant Other
Observable
Inputs
(Level 2)
 
Significant
Unobservable
Inputs
(Level 3)
 
(in millions)
Cash and cash equivalents
$
113.0

 
$
113.0

 
$
—

 
$
—

Unrealized gains on natural gas derivatives
0.1

 
—

 
0.1

 
—

Total assets at fair value
$
113.1

 
$
113.0

 
$
0.1

 
$
—

Unrealized losses on natural gas derivatives
$
(3.6
)
 
$
—

 
$
(3.6
)
 
$
—

Total liabilities at fair value
$
(3.6
)
 
$
—

 
$
(3.6
)
 
$
—