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Derivative Financial Instruments (Tables)
 9 Months Ended
Sep. 30, 2016
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 7—Fair Value Measurements.
 
September 30,
2016
 
December 31,
2015
 
(in millions)
Derivative Assets
 
 
 
Unrealized gains in other current assets
$
0.6

 
$
—

Unrealized gains in other assets
0.2

 
—

Total derivative assets
0.8

 
—

Derivative Liabilities
 
 
 
Unrealized losses in other current liabilities
(3.6
)
 
(15.9
)
Unrealized losses in other liabilities
(3.4
)
 
(12.0
)
Total derivative liabilities
(7.0
)
 
(27.9
)
Net derivative liabilities
$
(6.2
)
 
$
(27.9
)
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.
 
Three months ended 
 September 30,
 
Nine months ended 
 September 30,
 
2016
 
2015
 
2016
 
2015
 
(in millions)
Unrealized net mark-to-market (losses) gains
$
(3.3
)
 
$
(17.0
)
 
$
21.7

 
$
(10.5
)
Realized net losses
(1.2
)
 
(0.5
)
 
(16.2
)
 
(5.9
)
Net derivative (losses) gains
$
(4.5
)
 
$
(17.5
)
 
$
5.5

 
$
(16.4
)
Schedule of offsetting of derivative assets and liabilities
The following table presents amounts relevant to offsetting of our derivative assets and liabilities as of September 30, 2016 and December 31, 2015:
 
Gross and net amounts
presented in
consolidated
balance sheets(1)
 
Gross amounts
not offset in consolidated
balance sheets
 
 
 
 
Financial
instruments
 
Cash
collateral
received
(pledged)
 
Net
amount
 
(in millions)
September 30, 2016
 

 
 

 
 

 
 

Total derivative assets
$
0.8

 
$
0.8

 
$
—

 
$
—

Total derivative liabilities
(7.0
)
 
(0.8
)
 
—

 
(6.2
)
Net derivative liabilities
$
(6.2
)
 
$
—

 
$
—

 
$
(6.2
)
December 31, 2015
 

 
 

 
 

 
 

Total derivative assets
$
—

 
$
—

 
$
—

 
$
—

Total derivative liabilities
(27.9
)
 
—

 
—

 
(27.9
)
Net derivative liabilities
$
(27.9
)
 
$
—

 
$
—

 
$
(27.9
)

_______________________________________________________________________________

(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.