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Fair Value Measurements (Tables)
 9 Months Ended
Sep. 30, 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 September 30, 2016 and December 31, 2015:
 
September 30, 2016
 
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
$
48.7

 
$
48.7

 
$
—

 
$
—

Unrealized gains on natural gas derivatives
0.8

 
—

 
0.8

 
—

Total assets at fair value
$
49.5

 
$
48.7

 
$
0.8

 
$
—

Unrealized losses on natural gas derivatives
$
(7.0
)
 
$
—

 
$
(7.0
)
 
$
—

Total liabilities at fair value
$
(7.0
)
 
$
—

 
$
(7.0
)
 
$
—


 
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
)
 
$
—