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Plant and Equipment and Goodwill (Tables)
9 Months Ended
Sep. 30, 2012
Plant and Equipment and Goodwill [Abstract]  
Plant and equipment
Plant and equipment consisted of the following (in millions):

   
September 30,
2012
  
December 31,
2011
 
        
Plant and equipment, at cost
 $2,999.9  $2,688.0 
Accumulated depreciation
  (1,332.7)  (1,187.9)
  Total plant and equipment
 $1,667.2  $1,500.1 
Changes in goodwill
Changes in goodwill during the nine months ended September 30, 2012 were as follows (in millions):

Balance at December 31, 2011
 $1,615.3 
Current year acquisitions
  256.0 
Adjustments to the purchase price allocation for prior year acquisitions
  43.5 
Translation
  3.3 
  Balance at September 30, 2012
 $1,918.1