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Comprehensive Income (Tables)
 12 Months Ended
Dec. 31, 2011
Statement of Income and Comprehensive Income [Abstract]  
Accumulated other comprehensive income, net of related tax
   The following table reflects the accumulated balances of other comprehensive income (loss):

(Millions of Dollars)
   
Currency Translation Adjustment
     
Unrecognized Pension
Costs
     
Net Gain (Loss) On Cash Flow Hedges
     
Accumulated Other Comprehensive Income (Loss)
 
Balance at January 1, 2009
 
$
32.3
   
$
(65.0
)
 
$
1.1
   
$
(31.6
)
Current year net change
   
23.4
     
12.8
     
(1.4
)
   
34.8
 
                                 
Balance at December 31, 2009
 
$
55.7
   
$
(52.2
)
 
$
(0.3
)
 
$
3.2
 
Current year net change
   
(9.2
)
   
0.3
     
2.1
     
(6.8
)
                                 
Balance at December 31, 2010
 
$
46.6
   
$
(51.9
)
 
$
1.7
   
$
(3.6
)
Current year net change
   
(16.7
)
   
(25.6
)
   
0.6
     
(41.7
)
                                 
Balance at December 31, 2011
 
$
29.9
   
$
(77.5
)
 
$
2.3
   
$
(45.3
)