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Inventories (Tables)
 3 Months Ended
Mar. 31, 2019
Inventories [Abstract]  
Inventories by Major Category
The following is a summary of inventories by major category:

(millions of dollars)
 
Mar. 31,
2019
  
Dec. 31,
2018
 
       
Raw materials
 
$
102.8
  
$
93.4
 
Work-in-process
  
10.2
   
11.2
 
Finished goods
  
97.5
   
92.2
 
Packaging and supplies
  
43.9
   
42.4
 
Total inventories
 
$
254.4
  
$
239.2