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Inventories (Tables)
12 Months Ended
Dec. 31, 2021
Inventories [Abstract]  
Inventories by Major Category

The following is a summary of inventories by major category:

 
December 31,
 
(millions of dollars)
 
2021
   
2020
 
Raw materials
 
$
136.6
   
$
107.1
 
Work-in-process
   
10.7
     
9.0
 
Finished goods
   
99.4
     
85.6
 
Packaging and supplies
   
51.0
     
46.5
 
Total inventories
 
$
297.7
   
$
248.2