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Inventories
12 Months Ended
Dec. 31, 2018
Inventories [Abstract]  
Inventories
Note 8.  Inventories

The following is a summary of inventories by major category:

  
December 31,
 
(millions of dollars)
 
2018
  
2017
 
Raw materials
 
$
93.4
  
$
82.5
 
Work-in-process
  
11.2
   
7.9
 
Finished goods
  
92.2
   
92.3
 
Packaging and supplies
  
42.4
   
36.6
 
Total inventories
 
$
239.2
  
$
219.3