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Comprehensive Income
 12 Months Ended
Dec. 31, 2011
Statement of Income and Comprehensive Income [Abstract]  
Comprehensive Income
Note 20.  Comprehensive Income

     Comprehensive income includes changes in the fair value of certain financial derivative instruments that qualify for hedge accounting to the extent they are effective, the recognition of deferred pension costs, and cumulative foreign currency translation adjustments.

     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
)

     The income tax expense (benefit) associated with items included in other comprehensive income (loss) was approximately $(15.5) million, $1.9 million and $10.0 million for the years ended December 31, 2011 2010 and 2009, respectively.