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Inventories (Tables)
 12 Months Ended
Dec. 31, 2016
Inventories [Abstract]  
Inventories by major category
The following is a summary of inventories by major category:

   
2016
  
2015
 
 
(millions of dollars)   
 
Raw materials
 
$
70.6
  
$
73.4
 
Work-in-process
  
5.4
   
5.4
 
Finished goods
  
80.5
   
86.1
 
Packaging and supplies
  
30.4
   
30.0
 
Total inventories
 
$
186.9
  
$
194.9