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Inventories (Tables)
3 Months Ended
Apr. 01, 2018
Inventories [Abstract]  
Inventories by major category
The following is a summary of inventories by major category:

  
Apr. 1,
2018
  
Dec. 31,
2017
 
  
(millions of dollars)
 
Raw materials
 
$
84.1
  
$
82.5
 
Work-in-process
  
7.8
   
7.9
 
Finished goods
  
89.5
   
92.3
 
Packaging and supplies
  
39.8
   
36.6
 
Total inventories
 
$
221.2
  
$
219.3