Reporting Segments

3 Months Ended

Mar. 31, 2012

Segment Reporting [Abstract]

Segment Reporting Disclosure

Reporting Segments

The Company's business is comprised of two reporting segments: Engine and Drivetrain. These segments are strategic business groups, which are managed separately as each represents a specific grouping of related automotive components and systems.

The Company allocates resources to each segment based upon the projected after-tax return on invested capital ("ROIC") of its business initiatives. ROIC is comprised of Adjusted EBIT after deducting notional taxes compared to the projected average capital investment required. Adjusted EBIT is comprised of earnings before interest, income taxes and noncontrolling interest (“EBIT") adjusted for restructuring, goodwill impairment charges, affiliates' earnings and other items not reflective of on-going operating profit or loss.

Adjusted EBIT is the measure of segment profit or loss used by the Company. The Company believes Adjusted EBIT is most reflective of the operational profitability or loss of our reporting segments. The following tables show segment information and Adjusted EBIT for the Company's reporting segments.

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

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

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.