Earnings Per Share (Tables)

3 Months Ended

Mar. 31, 2018

Earnings Per Share [Abstract]

Schedule of Earnings Per Share Reconciliation

	Three Months Ended March 31,
(in millions, except per share amounts)	2018		2017
Basic earnings per share:
Net earnings attributable to BorgWarner Inc.	$	225.1	$	189.2
Weighted average shares of common stock outstanding	209.475		211.596
Basic earnings per share of common stock	$	1.07	$	0.89
Diluted earnings per share:
Net earnings attributable to BorgWarner Inc.	$	225.1	$	189.2
Weighted average shares of common stock outstanding	209.475		211.596
Effect of stock-based compensation	1.291		0.640
Weighted average shares of common stock outstanding including dilutive shares	210.766		212.236
Diluted earnings per share of common stock	$	1.07	$	0.89