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Inventories (Tables)
 6 Months Ended
Jun. 28, 2020
Inventories [Abstract]  
Inventories by Major Category

The following is a summary of inventories by major category:

(millions of dollars)
  
Jun. 28,
2020
    
Dec. 31,
2019
  
             
Raw materials
  
$
116.1
    
$
105.9
  
Work-in-process
    
9.7
      
7.2
  
Finished goods
    
98.4
      
95.5
  
Packaging and supplies
    
45.6
      
44.7
  
Total inventories
  
$
269.8
    
$
253.3