Reporting Segments (Tables)

9 Months Ended

Sep. 30, 2013

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)	2013			2012			2013			2012
Engine	$	1,210.3		$	1,168.0		$	3,756.1		$	3,745.8
Drivetrain	604.0			534.4			1,818.9			1,739.7
Inter-segment eliminations	(8.1		)	(7.2		)	(23.8		)	(21.4		)
Net sales	$	1,806.2		$	1,695.2		$	5,551.2		$	5,464.1

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)	2013			2012			2013			2012
Engine	$	195.5		$	184.1		$	618.1		$	604.4
Drivetrain	65.9			44.1			181.7			159.9
Adjusted EBIT	261.4			228.2			799.8			764.3
Program termination agreement	—			—			11.3			—
Retirement related obligations	—			—			5.9			—
Loss from disposal activities	—			1.8			—			39.7
Restructuring expense	—			27.4			—			27.4
Corporate, including equity in affiliates' earnings and stock-based compensation	25.4			24.9			83.9			82.2
Interest income	(1.3		)	(1.0		)	(3.3		)	(3.7		)
Interest expense and finance charges	8.1			5.0			26.6			32.7
Earnings before income taxes and noncontrolling interest	229.2			170.1			675.4			586.0
Provision for income taxes	56.3			64.2			173.8			190.2
Net earnings	172.9			105.9			501.6			395.8
Net earnings attributable to the noncontrolling interest, net of tax	6.1			4.8			18.7			16.1
Net earnings attributable to BorgWarner Inc.	$	166.8		$	101.1		$	482.9		$	379.7

Segment assets

Total Assets

(millions of dollars)	September 30, 2013		December 31, 2012
Engine	$	3,514.0	$	3,299.2
Drivetrain	1,826.7		1,652.2
Total	5,340.7		4,951.4
Corporate (a)	1,623.6		1,449.4
Total assets	$	6,964.3	$	6,400.8

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