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Other Comprehensive Income (Loss) (Tables)
 12 Months Ended
Dec. 31, 2011
Other Comprehensive Income (Loss), Net of Tax [Abstract]  
The components of accumulated other comprehensive income (loss), net of tax [Text Block]
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
)
Changes in other comprehensive income (loss) in Consolidated Statement of Shareholders' Equity [Text Block]
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