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Inventories (Tables)
 6 Months Ended
Jul. 02, 2017
Inventories [Abstract]  
Inventories by major category
The following is a summary of inventories by major category:

  
July 2,
2017
  
December 31,
2016
 
  
(millions of dollars)
 
Raw materials
 
$
83.5
  
$
70.6
 
Work-in-process
  
6.6
   
5.4
 
Finished goods
  
87.9
   
80.5
 
Packaging and supplies
  
33.9
   
30.4
 
Total inventories
 
$
211.9
  
$
186.9