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Derivative Financial Instruments (Tables)
 12 Months Ended
Dec. 31, 2015
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Schedule of the gross fair values of derivatives on balance sheet
The gross fair values of derivatives on our consolidated balance sheets are shown below. All balance sheet amounts from derivatives arise from natural gas derivatives that are not designated as hedging instruments. For additional information on derivative fair values, see Note 8—Fair Value Measurements.
 
December 31,
 
2015
 
2014
 
(in millions)
Unrealized gains in other current assets
$
—

 
$
0.1

Unrealized losses in other current liabilities
(15.9
)
 
(3.6
)
Unrealized losses in other liabilities
(12.0
)
 
—

Net derivative liabilities
$
(27.9
)
 
$
(3.5
)
Schedule of effects of derivatives in consolidated statements of operations
The effect of derivatives in our consolidated statements of operations is shown below. All amounts arise from natural gas derivatives that are not designated as hedging instruments and are recorded in cost of goods sold.
 
Year ended December 31,
 
2015
 
2014
 
2013
 
(in millions)
Unrealized mark-to-market (losses) gains
$
(23.1
)
 
$
(12.6
)
 
$
9.1

Realized (losses) gains
(10.6
)
 
10.5

 
(0.8
)
Net derivative (losses) gains
$
(33.7
)
 
$
(2.1
)
 
$
8.3
Schedule of offsetting of derivative assets and liabilities
The following table presents amounts relevant to offsetting of our derivative assets and liabilities as of December 31, 2015 and 2014:
 
 
 
Gross amounts not offset in 
consolidated balance sheets
 
 
 
 
 
 
 
 
Gross and net amounts presented in
consolidated balance sheets(1)
 
Financial
instruments
 
Cash
collateral
received
(pledged)
 
Net
amount
 
(in millions)
December 31, 2015
 

 
 

 
 

 
 

Total derivative assets
$
—

 
$
—

 
$
—

 
$
—

Total derivative liabilities
(27.9
)
 
—

 
—

 
(27.9
)
Net assets (liabilities)
$
(27.9
)
 
$
—

 
$
—

 
$
(27.9
)
December 31, 2014
 

 
 

 
 

 
 

Total derivative assets
$
0.1

 
$
0.1

 
$
—

 
$
—

Total derivative liabilities
(3.6
)
 
(0.1
)
 
—

 
(3.5
)
Net assets (liabilities)
$
(3.5
)
 
$
—

 
$
—

 
$
(3.5
)
_______________________________________________________________________________

(1) 
We report the fair values of our derivative assets and liabilities on a gross basis on our consolidated balance sheets. As a result, amounts recognized and net amounts presented are the same.