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Derivative Financial Instruments (Tables)
3 Months Ended
Mar. 31, 2012
Derivative Financial Instruments  
Schedule of effect of derivatives in our consolidated statements of operations

 

 

 
  Three months ended
March 31,
 
 
  2012   2011  
 
  (in millions)
 

Realized losses

  $ (48.2 ) $ (9.6 )

Unrealized mark-to-market (losses) gains

    (55.9 )   0.7  
           

Net derivative losses

  $ (104.1 ) $ (8.9 )
           
Schedule of fair values of derivatives in our consolidated balance sheet

 

 

 
  March 31,
2012
  December 31,
2011
 
 
  (in millions)
 

Unrealized gains in other current assets

  $ 0.2   $ 0.5  

Unrealized losses in other current liabilities

    (130.2 )   (74.7 )

Unrealized losses in noncurrent liabilities

    (0.1 )    
           

Net unrealized derivative losses

  $ (130.1 ) $ (74.2 )