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Plant and Equipment and Goodwill (Tables)
6 Months Ended
Jun. 30, 2013
Plant and Equipment and Goodwill [Abstract]  
Plant and equipment
Plant and equipment consisted of the following (in millions):

 
 
June 30,
2013
 
 
December 31,
2012
 
 
 
 
 
 
 
 
Plant and equipment, at cost
 
$
3,368.9
 
 
$
3,155.9
 
Accumulated depreciation
 
 
(1,518.0
)
 
 
(1,390.8
)
Total plant and equipment
 
$
1,850.9
 
 
$
1,765.1
 

Changes in goodwill
Changes in goodwill during the six months ended June 30, 2013 were as follows (in millions):

Balance at December 31, 2012
 
$
1,923.9
 
Current year acquisitions
 
 
754.0
 
Adjustments to the purchase price allocation for prior year acquisitions
 
 
10.2
 
Translation
 
 
(17.9
)
Balance at June 30, 2013
 
$
2,670.2