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Comprehensive Income (Loss) (Tables)
 6 Months Ended
Jun. 30, 2011
Statement of Income and Comprehensive Income [Abstract]  
Schedule of Comprehensive Income (Loss)
The following table summarizes the components of comprehensive income (loss) on an after-tax basis for the three and six months ended June 30, 2011 and 2010:
 
Three Months Ended
June 30,
 
Six Months Ended
June 30,
(millions of dollars)
2011
 
2010
 
2011
 
2010
Foreign currency translation adjustments
$
40.1


 
$
(128.4
)
 
$
131.3


 
$
(215.2
)
Market value change in hedge instruments
(6.8
)
 
(0.5
)
 
(10.6
)
 
10.1


Unrealized gain on available-for-sale securities
0.2


 
—


 
0.2


 
—


Defined benefit post employment plans
—


 
—


 
(4.0
)
 
—


Change in accumulated other comprehensive income (loss)
33.5


 
(128.9
)
 
116.9


 
(205.1
)
Net earnings attributable to BorgWarner Inc.
162.0


 
82.8


 
286.5


 
159.0


Comprehensive income (loss)
195.5


 
(46.1
)
 
403.4


 
(46.1
)
Comprehensive income (loss) attributable to the noncontrolling interest
1.3


 
(4.0
)
 
2.7


 
(2.9
)
Comprehensive income (loss) attributable to BorgWarner Inc.
$
196.8


 
$
(50.1
)
 
$
406.1


 
$
(49.0
)