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Fair Value Measurements (Tables)
 12 Months Ended
Dec. 31, 2016
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 indicates the fair value hierarchy utilized to determine such fair value as of December 31, 2016 and 2015:
 
Balances as of December 31, 2016
 
Total
 
Quoted Market
Prices in Active
Markets
(Level 1)
 
Significant Other
Observable
Inputs
(Level 2)
 
Significant Unobservable Inputs (Level 3)
 
(in millions)
Cash equivalents
$
32.0

 
$
32.0

 
$
—

 
$
—

Unrealized gains on natural gas derivatives
9.0

 
—

 
9.0

 
—

Total assets at fair value
$
41.0

 
$
32.0

 
$
9.0

 
$
—

Unrealized losses on natural gas derivatives
(1.6
)
 
—

 
(1.6
)
 
—

Total liabilities at fair value
$
(1.6
)
 
$
—

 
$
(1.6
)
 
$
—

 
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 equivalents
$
95.9

 
$
95.9

 
$
—

 
$
—

Total assets at fair value
$
95.9

 
$
95.9

 
$
—

 
$
—

Unrealized losses on natural gas derivatives
$
(27.9
)
 
$
—

 
$
(27.9
)
 
$
—

Total liabilities at fair value
$
(27.9
)
 
$
—

 
$
(27.9
)
 
$
—