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

Millions of Dollars
 
2013
 
 
 
2012
 
 
 
 
 
 
 
 
 
Raw materials  
$
35.1
 
 
$
30.8
 
Work in process  
 
6.3
 
 
 
6.5
 
Finished goods  
 
26.3
 
 
 
26.5
 
Packaging and supplies  
 
21.5
 
 
 
20.8
 
Total inventories  
$
89.2
 
 
$
84.6