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Comprehensive Income (Tables)
 9 Months Ended
Sep. 30, 2012
Comprehensive Income [Abstract]  
Accumulated other comprehensive income, net of related tax
The components of accumulated other comprehensive loss, net of related tax, are as follows:

(millions of dollars)
Sept. 30,
 2012
 
 
 
Dec. 31,
2011
 
Foreign currency translation gains  
$
31.5
 
 
$
29.9
 
Unrecognized pension costs  
 
(72.0
)
 
 
(77.5
)
Net gain (loss) on cash flow hedges  
 
2.7
 
 
 
2.3
 
Accumulated other comprehensive loss  
$
(37.8
)
 
$
(45.3
)