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Short-term Investments (Tables)
 12 Months Ended
Dec. 31, 2011
Short-term Investments [Abstract]  
Composition of short term investments
     The composition of the Company's short-term investments are as follows:

(in millions of dollars)
 
2011
   
2010
Short-term Investments
         
 
Short-term bank deposits                                                                   
$
18.5
 
$
16.7