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Plant and Equipment and Goodwill (Tables)
3 Months Ended
Mar. 31, 2013
Plant and Equipment and Goodwill [Abstract]  
Plant and equipment
Plant and equipment consisted of the following (in millions):

   
March 31,
2013
  
December 31,
2012
 
        
Plant and equipment, at cost
 $3,264.5  $3,155.9 
Accumulated depreciation
  (1,479.9)  (1,390.8)
Total plant and equipment
 $1,784.6  $1,765.1 

Changes in goodwill
Changes in goodwill during the three months ended March 31, 2013 were as follows (in millions):

Balance at December 31, 2012
 
$
1,923.9
 
Adjustments to the purchase price allocation for prior year acquisitions
 
 
(0.5
)
Translation effect of currency changes
 
 
(10.4
)
Balance at March 31, 2013
 
$
1,913.0