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Comprehensive Income (Tables)
 12 Months Ended
Dec. 31, 2012
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, 2010
 
$
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
)
Current year net change
 
 
2.1
 
 
 
(7.8
)
 
 
(0.2
)
 
 
(5.9
)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Balance at December 31, 2012
 
$
32.0
 
 
 
(85.3
)
 
 
2.1
 
 
 
(51.2
)