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Inventories (Tables)
 3 Months Ended
Mar. 31, 2013
Inventories [Abstract]  
Inventories by Major Category
     The following is a summary of inventories by major category:

(millions of dollars)
 
 
March 31,
2013
December 31,
2012
 
Raw materials  
 
$
34.0
 
 
$
30.8
 
Work-in-process  
 
 
6.8
 
 
 
6.5
 
Finished goods  
 
 
26.8
 
 
 
26.5
 
Packaging and supplies  
 
 
21.2
 
 
 
20.8
 
Total inventories  
 
$
88.8
 
 
$
84.6