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Receivables (Tables)
3 Months Ended
Mar. 31, 2012
Receivables [Abstract]  
Receivables
Receivables consisted of the following (in millions):

   
March 31,
2012
  
December 31,
2011
 
        
Trade receivables
 $1,580.7  $1,523.5 
Insurance company receivable related to the indemnity settlement with BP Exploration and Production Inc.
     167.5 
Other receivables
  129.8   76.2 
Allowance for doubtful accounts
  (10.5)  (9.9)
Total receivables
 $1,700.0  $1,757.3