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Short-term Investments (Tables)
 12 Months Ended
Dec. 31, 2013
Short-term Investments [Abstract]  
Composition of short term investments

     The composition of the Company's short-term investments is as follows:

Millions of Dollars
 
2013
 
 
2012
Short-term Investments
 
 
 
 
 
 
Short-term bank deposits                                                                                        
$
15.8
 
$
14.2