Earnings Per Share (Tables)

12 Months Ended

Dec. 31, 2017

Earnings Per Share [Abstract]

Schedule of Earnings per Share reconciliation [Text Block]

	Year Ended December 31,
(in millions except per share amounts)	2017		2016		2015
Basic earnings per share:
Net earnings attributable to BorgWarner Inc.	$	439.9	$	118.5	$	609.7
Weighted average shares of common stock outstanding	210.429		214.374		224.414
Basic earnings per share of common stock	$	2.09	$	0.55	$	2.72
Diluted earnings per share:
Net earnings attributable to BorgWarner Inc.	$	439.9	$	118.5	$	609.7
Weighted average shares of common stock outstanding	210.429		214.374		224.414
Effect of stock-based compensation	1.119		0.954		1.234
Weighted average shares of common stock outstanding including dilutive shares	211.548		215.328		225.648
Diluted earnings per share of common stock	$	2.08	$	0.55	$	2.70