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Other Comprehensive Income (Loss)
 12 Months Ended
Dec. 31, 2011
Other Comprehensive Income (Loss), Net of Tax [Abstract]  
Other comprehensive income (loss)
OTHER COMPREHENSIVE INCOME (LOSS)

The components of accumulated other comprehensive loss, net of tax, in the Consolidated Balance Sheets are as follows:

 
December 31,
(millions of dollars)
2011
 
2010
Foreign currency translation adjustments
$
86.9

 
$
147.1

Market value of hedge instruments
(50.5
)
 
(44.8
)
Defined benefit post employment plans
(187.2
)
 
(158.1
)
Unrealized gain on available-for-sale securities
1.1

 
1.2

Comprehensive income (loss) attributable to the noncontrolling interest
(1.1
)
 
0.9

Accumulated other comprehensive loss
$
(150.8
)
 
$
(53.7
)


The amounts presented as changes in accumulated other comprehensive income (loss), net of related taxes, are added to (deducted from) net earnings resulting in comprehensive income (loss). The following table summarizes the components of comprehensive income (loss) on an after-tax basis for the years ended December 31, 2011, 2010 and 2009.

 
Year Ended December 31,
(millions of dollars)
2011
 
2010
 
2009
Foreign currency translation adjustments
$
(60.2
)
 
$
(63.5
)
 
$
54.8

Market value change of hedge instruments
(7.7
)
 
(20.5
)
 
63.3

Income taxes
2.0

 
6.9

 
(18.2
)
Net foreign currency translation and hedge instruments
(65.9
)
 
(77.1
)
 
99.9

 
 
 
 
 
 
Unrealized (loss) gain on available-for-sale securities
(0.1
)
 
1.2

 
—

 
 
 
 
 
 
Defined benefit post employment plans
(39.7
)
 
23.9

 
(13.1
)
Income taxes
10.6

 
(16.1
)
 
9.7

Net defined benefit post employment plans
(29.1
)
 
7.8

 
(3.4
)
 
 
 
 
 
 
Change in accumulated other comprehensive income (loss)
(95.1
)
 
(68.1
)
 
96.5

 
 
 
 
 
 
Net earnings attributable to BorgWarner Inc. 
550.1

 
377.4

 
27.0

Comprehensive income
455.0

 
309.3

 
123.5

Comprehensive (loss) income attributable to noncontrolling interest
(2.0
)
 
(0.1
)
 
3.9

Comprehensive income attributable to BorgWarner Inc.
$
453.0

 
$
309.2

 
$
127.4