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Comprehensive Income (Loss)
9 Months Ended
Sep. 30, 2011
Statement of Income and Comprehensive Income [Abstract] 
Comprehensive Income (Loss)
Comprehensive Income (Loss)

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 three and nine months ended September 30, 2011 and 2010:
 
Three Months Ended
September 30,
 
Nine Months Ended
September 30,
(millions of dollars)
2011
 
2010
 
2011
 
2010
Foreign currency translation adjustments
$
(147.5
)
 
$
175.7

 
$
(16.2
)
 
$
(39.5
)
Market value change in hedge instruments
(3.1
)
 
(21.9
)
 
(13.7
)
 
(11.8
)
Unrealized gain on available-for-sale securities
—

 
—

 
0.2

 
—

Defined benefit post employment plans
3.8

 
—

 
(0.2
)
 
—

Change in accumulated other comprehensive income (loss)
(146.8
)
 
153.8

 
(29.9
)
 
(51.3
)
Net earnings attributable to BorgWarner Inc.
141.6

 
106.7

 
428.1

 
265.7

Comprehensive income (loss)
(5.2
)
 
260.5

 
398.2

 
214.4

Comprehensive income (loss) attributable to the noncontrolling interest
(4.1
)
 
0.1

 
(1.4
)
 
(2.8
)
Comprehensive income (loss) attributable to BorgWarner Inc.
$
(9.3
)
 
$
260.6

 
$
396.8

 
$
211.6