Reporting Segments (Tables)

9 Months Ended

Sep. 30, 2012

Segment Reporting [Abstract]

Net Sales by Reporting Segment

Net Sales by Reporting Segment

	Three Months Ended September 30,						Nine Months Ended September 30,
(millions of dollars)	2012			2011			2012			2011
Engine	$	1,168.0		$	1,258.2		$	3,745.8		$	3,805.5
Drivetrain	534.4			538.7			1,739.7			1,550.8
Inter-segment eliminations	(7.2		)	(5.1		)	(21.4		)	(15.3		)
Net sales	$	1,695.2		$	1,791.8		$	5,464.1		$	5,341.0

Segment Earnings Before Interest and Income Taxes

Adjusted Earnings Before Interest, Income Taxes and Noncontrolling Interest (“Adjusted EBIT”)

	Three Months Ended September 30,						Nine Months Ended September 30,
(millions of dollars)	2012			2011			2012			2011
Engine	$	184.1		$	188.2		$	604.4		$	571.5
Drivetrain	44.1			43.5			159.9			114.4
Adjusted EBIT	228.2			231.7			764.3			685.9
Loss from disposal activities	1.8			—			39.7			—
Restructuring expense	27.4			—			27.4			—
Patent infringement settlement, net of legal costs incurred	—			—			—			(29.1		)
Corporate, including equity in affiliates' earnings and stock-based compensation	24.9			21.4			82.2			80.6
Interest income	(1.0		)	(1.3		)	(3.7		)	(3.5		)
Interest expense and finance charges	5.0			18.5			32.7			57.4
Earnings before income taxes and noncontrolling interest	170.1			193.1			586.0			580.5
Provision for income taxes	64.2			46.4			190.2			137.1
Net earnings	105.9			146.7			395.8			443.4
Net earnings attributable to the noncontrolling interest, net of tax	4.8			5.1			16.1			15.3
Net earnings attributable to BorgWarner Inc.	$	101.1		$	141.6		$	379.7		$	428.1

Segment assets

Total Assets

(millions of dollars)	September 30, 2012		December 31, 2011
Engine	$	3,343.8	$	3,329.0
Drivetrain	1,628.3		1,562.8
Total	4,972.1		4,891.8
Corporate (a)	1,374.4		1,066.8
Total assets	$	6,346.5	$	5,958.6

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(a) Corporate assets include investments and advances and deferred income taxes