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Plant and Equipment and Goodwill (Tables)
9 Months Ended
Sep. 30, 2011
Notes to Financial Statements [Abstract] 
Plant and Equipment
Plant and equipment consisted of the following (in millions):

   
September 30,
2011
  
December 31,
2010
 
        
Plant and equipment, at cost
 $2,468.1  $2,285.9 
Accumulated depreciation
  (1,128.6)  (1,038.1)
Total plant and equipment
 $1,339.5  $1,247.8 

Changes in goodwill during the nine months
Changes in goodwill during the nine months ended September 30, 2011 were as follows (in millions):

Balance at December 31, 2010
 $1,475.8 
Current year acquisitions
  25.7 
Translation
  (4.8)
Balance at September 30, 2011
 $1,496.7