Reporting Segments (Tables)

3 Months Ended

Mar. 31, 2012

Segment Reporting [Abstract]

Net Sales by Reporting Segment

Net Sales by Reporting Segment

	Three Months Ended March 31,
(millions of dollars)	2012			2011
Engine	$	1,308.2		$	1,249.4
Drivetrain	611.4			486.4
Inter-segment eliminations	(7.1		)	(5.4		)
Net sales	$	1,912.5		$	1,730.4

Segment Earnings Before Interest and Income Taxes

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

	Three Months Ended March 31,
(millions of dollars)	2012			2011
Engine	$	209.8		$	186.1
Drivetrain	61.2			32.0
Adjusted EBIT	271.0			218.1
Corporate, including equity in affiliates' earnings and stock-based compensation	36.1			30.4
Interest income	(1.4		)	(1.0		)
Interest expense and finance charges	15.1			18.4
Earnings before income taxes and noncontrolling interest	221.2			170.3
Provision for income taxes	57.5			40.9
Net earnings	163.7			129.4
Net earnings attributable to the noncontrolling interest, net of tax	5.7			4.9
Net earnings attributable to BorgWarner Inc.	$	158.0		$	124.5

Segment assets

Total Assets

(millions of dollars)	March 31, 2012		December 31, 2011
Engine	$	3,495.9	$	3,329.0
Drivetrain	1,673.5		1,562.8
Total	5,169.4		4,891.8
Corporate (a)	1,111.9		1,066.8
Total assets	$	6,281.3	$	5,958.6

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