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Short-term Investments
 12 Months Ended
Dec. 31, 2011
Short-term Investments [Abstract]  
Short-term Investments
Note 12.  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
    
     There were no unrealized holding gains and losses on the short-term bank deposits held at December 31, 2011.