Reporting Segments (Tables)

3 Months Ended

Mar. 31, 2018

Segment Reporting [Abstract]

Net Sales by Reporting Segment

	Three Months Ended March 31,
(in millions)	2018			2017
Engine	$	1,716.1		$	1,495.4
Drivetrain	1,082.9			924.9
Inter-segment eliminations	(14.7		)	(13.3		)
Net sales	$	2,784.3		$	2,407.0

Segment Earnings Before Interest and Income Taxes

	Three Months Ended March 31,
(in millions)	2018			2017
Engine	$	280.2		$	246.2
Drivetrain	121.0			104.4
Adjusted EBIT	401.2			350.6
Restructuring expense	7.5			—
Merger and acquisition expense	2.2			—
Lease termination settlement	—			5.3
Other income, net	(4.8		)	—
Other postretirement income	(2.6		)	(1.2		)
Corporate, including equity in affiliates' earnings and stock-based compensation	52.6			44.1
Interest income	(1.5		)	(1.5		)
Interest expense and finance charges	16.1			18.0
Earnings before income taxes and noncontrolling interest	331.7			285.9
Provision for income taxes	94.9			86.3
Net earnings	236.8			199.6
Net earnings attributable to the noncontrolling interest, net of tax	11.7			10.4
Net earnings attributable to BorgWarner Inc.	$	225.1		$	189.2

Segment assets

	March 31,		December 31,
(in millions)	2018		2017
Engine	$	4,919.1	$	4,733.4
Drivetrain	4,025.1		3,905.3
Total	8,944.2		8,638.7
Corporate *	1,090.6		1,150.9
Total assets	$	10,034.8	$	9,789.6

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*    Corporate assets include investments and other long-term receivables and certain deferred income taxes.