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Goodwill and Other Intangible Assets (Tables)
6 Months Ended
Jul. 03, 2011
Goodwill and Other Intangible Assets [Abstract]  
Acquired intangible assets subject to amortization
Acquired intangible assets subject to amortization as of July 3, 2011 and December 31, 2010 were as follows:

   
July 3, 2011
 
December 31, 2010
(millions of dollars)
   
Gross Carrying Amount
     
Accumulated Amortization
     
Gross Carrying Amount
     
Accumulated Amortization
 
Patents and trademarks
 
$
6.2
   
$
3.8
   
$
6.2
   
$
3.5
 
Customer lists
   
2.7
     
1.3
     
2.7
     
1.2
 
   
$
8.9
   
$
5.1
   
$
8.9
   
$
4.7