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Derivative Financial Instruments (Tables)
 6 Months Ended
Jun. 30, 2014
Derivative Financial Instruments  
Schedule of the gross fair values of derivatives on balance sheet

  June 30,
2014		   December 31,
2013		  
 
   (in millions)
  

Unrealized gains in other current assets

   $ 0.7   $ 7.8  

Unrealized losses in other current liabilities

     (0.5 )   —  
           
​ ​ ​ ​ ​ ​ ​ ​

Net unrealized derivative gains

   $ 0.2   $ 7.8  
           
​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​
           
Schedule of effects of derivatives in consolidated statements of operations

  Three months
ended
June 30,		   Six months
ended
June 30,		  
 
   2014   2013   2014   2013  
 
   (in millions)
  

Unrealized mark-to-market (losses) gains

   $ (4.9 ) $ (2.9 ) $ (8.9 ) $ 0.8  

Realized gains (losses)

     4.9     2.7     14.8     1.1  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Net derivative gains (losses)

   $ —   $ (0.2 ) $ 5.9   $ 1.9  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
                   
Schedule of offsetting of derivative assets and liabilities

 

 
    
   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)
  

June 30, 2014

                          

Total derivative assets

   $ 0.7   $ 0.5   $ —   $ 0.2  

Total derivative liabilities

     0.5     0.5     —     —  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Net assets

   $ 0.2   $ —   $ —   $ 0.2  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
                   

December 31, 2013

                          

Total derivative assets

   $ 7.8   $ —   $ —   $ 7.8  

Total derivative liabilities

     —     —     —     —  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Net assets

   $ 7.8   $ —   $ —   $ 7.8  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
                   
(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.