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Goodwill and Other Intangible Assets (Tables)
 6 Months Ended
Jul. 01, 2018
Goodwill and Other Intangible Assets [Abstract]  
Intangible Assets Subject to Amortization
Intangible assets subject to amortization as of July 1, 2018 and December 31, 2017 were as follows:

    
July 1, 2018
  
Dec. 31, 2017
 
  
Weighted
Average
Useful Life
(Years)
 
 
 
Gross
Carrying
Amount
  
Accumulated
Amortization
  
Gross
Carrying
Amount
  
Accumulated
Amortization
 
     
(millions of dollars)
 
Tradenames
  
34
  
$
209.8
  
$
23.3
  
$
199.8
  
$
20.7
 
Technology
  
12
   
18.8
   
5.6
   
18.8
   
4.8
 
Patents and trademarks
  
17
   
6.4
   
5.4
   
6.4
   
5.3
 
Customer relationships
  
30
   
14.5
   
2.8
   
4.5
   
2.2
 
   
28
  
$
249.5
  
$
37.1
  
$
229.5
  
$
33.0