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Goodwill and Other Intangible Assets (Tables)
 9 Months Ended
Oct. 01, 2017
Goodwill and Other Intangible Assets [Abstract]  
Acquired intangible assets subject to amortization
Acquired intangible assets subject to amortization as of October 1, 2017 and December 31, 2016 were as follows:

     
Oct. 1, 2017
  
Dec. 31, 2016
 
  
Weighted
Average
Useful Life
(Years)
  
Gross
Carrying
Amount
  
Accumulated
Amortization
  
Gross
Carrying
Amount
  
Accumulated
Amortization
 
     
(millions of dollars)
 
Tradenames
  
34
  
$
199.8
  
$
19.4
  
$
199.8
  
$
15.3
 
Technology
  
12
   
18.8
   
4.5
   
18.8
   
3.6
 
Patents and trademarks
  
17
   
6.4
   
5.2
   
6.4
   
4.8
 
Customer relationships
  
30
   
4.5
   
2.0
   
4.5
   
1.4
 
   
28
  
$
229.5
  
$
31.1
  
$
229.5
  
$
25.1