Reporting Segments (Tables)

9 Months Ended

Sep. 30, 2011

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)	2011			2010			2011			2010
Engine	$	1,258.2		$	1,018.8		$	3,805.5		$	2,942.4
Drivetrain	538.7			397.1			1,550.8			1,191.6
Inter-segment eliminations	(5.1		)	(5.0		)	(15.3		)	(14.6		)
Net sales	$	1,791.8		$	1,410.9		$	5,341.0		$	4,119.4

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)	2011			2010			2011			2010
Engine	$	188.2		$	136.4		$	571.5		$	375.9
Drivetrain	43.5			31.1			114.4			105.1
Adjusted EBIT	231.7			167.5			685.9			481.0
Patent infringement settlement, net of legal costs incurred	—			—			(29.1		)	—
Environmental litigation settlement	—			—			—			28.0
BERU - Eichenauer equity investment gain	—			—			—			(8.0		)
Corporate, including equity in affiliates' earnings and stock-based compensation	21.4			34.0			80.6			84.3
Interest income	(1.3		)	(0.6		)	(3.5		)	(1.8		)
Interest expense and finance charges	18.5			18.4			57.4			46.8
Earnings before income taxes and noncontrolling interest	193.1			115.7			580.5			331.7
Provision for income taxes	46.4			4.2			137.1			51.1
Net earnings	146.7			111.5			443.4			280.6
Net earnings attributable to the noncontrolling interest, net of tax	5.1			4.8			15.3			14.9
Net earnings attributable to BorgWarner Inc.	$	141.6		$	106.7		$	428.1		$	265.7

Segment assets

Total Assets

(millions of dollars)	September 30, 2011		December 31, 2010
Engine	$	3,436.7	$	3,277.7
Drivetrain	1,579.0		1,230.5
Total	5,015.7		4,508.2
Corporate (a)	1,078.6		1,046.8
Total assets	$	6,094.3	$	5,555.0

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(a) Corporate assets include equity in affiliates, investments and advances and deferred income taxes