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Non-Operating Income and Deductions (Tables)
 12 Months Ended
Dec. 31, 2011
Non-Operating Income and Deductions [Abstract]  
Non-operating Income and Deductions
(Millions of dollars)
Year Ended December 31,
     
2011
       
2010
       
2009
 
 
Interest income
$
3.9
     
$
2.7
     
$
2.9
 
 
Interest expense
 
(3.3
)
     
(3.3
)
     
(3.5
)
 
Foreign exchange gains (losses)
 
(1.2
)
     
0.3
       
(2.4
)
 
Foreign currency translation loss upon liquidation
 
--
       
--
       
(2.3
)
 
Foreign currency translation loss upon deconsolidation of a foreign entity
 
(1.4
)
                   
 
Gain on sale of previously impaired assets
 
--
       
0.2
       
--
 
 
Settlement for  customer contract terminations
 
--
       
0.8
       
--
 
 
Other deductions
 
(0.6
)
     
(0.1
)
     
(0.8
)
Non-operating income (deductions), net
$
(2.6
)
   
$
0.6
     
$
(6.1
)