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Receivables (Tables)
3 Months Ended
Mar. 31, 2013
Receivables [Abstract]  
Receivables
Receivables consisted of the following (in millions):

   
March 31,
2013
  
December 31,
2012
 
        
Trade receivables
  1,693.0  $1,823.2 
Other receivables
  153.6   151.4 
Allowance for doubtful accounts
  (10.9)  (7.9)
Total receivables
 $1,835.7  $1,966.7