Reporting Segments (Tables)

6 Months Ended

Jun. 30, 2018

Segment Reporting [Abstract]

Net Sales by Reporting Segment

	Three Months Ended June 30,						Six Months Ended June 30,
(in millions)	2018			2017			2018			2017
Engine	$	1,674.3		$	1,481.8		$	3,390.4		$	2,977.2
Drivetrain	1,034.1			921.0			2,117.0			1,845.9
Inter-segment eliminations	(14.4		)	(13.1		)	(29.1		)	(26.4		)
Net sales	$	2,694.0		$	2,389.7		$	5,478.3		$	4,796.7

Segment Earnings Before Interest and Income Taxes

	Three Months Ended June 30,						Six Months Ended June 30,
(in millions)	2018			2017			2018			2017
Engine	$	278.8		$	243.3		$	559.0		$	489.5
Drivetrain	116.3			109.2			237.3			213.6
Adjusted EBIT	395.1			352.5			796.3			703.1
Restructuring expense	31.2			—			38.7			—
Merger, acquisition and divestiture expense	1.0			—			3.2			—
Lease termination settlement	—			—			—			5.3
Other income, net	—			—			(4.8		)	—
Other postretirement income	(2.4		)	(1.4		)	(5.0		)	(2.6		)
Corporate, including equity in affiliates' earnings and stock-based compensation	37.1			40.0			89.7			84.1
Interest income	(1.4		)	(1.4		)	(2.9		)	(2.9		)
Interest expense and finance charges	14.9			18.0			31.0			36.0
Earnings before income taxes and noncontrolling interest	314.7			297.3			646.4			583.2
Provision for income taxes	30.4			76.2			125.3			162.5
Net earnings	284.3			221.1			521.1			420.7
Net earnings attributable to the noncontrolling interest, net of tax	12.5			9.1			24.2			19.5
Net earnings attributable to BorgWarner Inc.	$	271.8		$	212.0		$	496.9		$	401.2

Segment assets

	June 30,		December 31,
(in millions)	2018		2017
Engine	$	4,741.0	$	4,732.9
Drivetrain	3,921.6		3,903.8
Total	8,662.6		8,636.7
Corporate *	1,114.6		1,150.9
Total assets	$	9,777.2	$	9,787.6

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