Earnings Per Share (Tables)

9 Months Ended

Sep. 30, 2017

Earnings Per Share [Abstract]

Schedule of Earnings Per Share Reconciliation

	Three Months Ended September 30,				Nine Months Ended September 30,
(in millions, except per share amounts)	2017		2016		2017		2016
Basic earnings per share:
Net earnings attributable to BorgWarner Inc.	$	184.9	$	83.3	$	586.1	$	411.8
Weighted average shares of common stock outstanding	209.803		212.872		210.657		215.332
Basic earnings per share of common stock	$	0.88	$	0.39	$	2.78	$	1.91
Diluted earnings per share:
Net earnings attributable to BorgWarner Inc.	$	184.9	$	83.3	$	586.1	$	411.8
Weighted average shares of common stock outstanding	209.803		212.872		210.657		215.332
Effect of stock-based compensation	1.210		0.894		0.918		0.857
Weighted average shares of common stock outstanding including dilutive shares	211.013		213.766		211.575		216.189
Diluted earnings per share of common stock	$	0.88	$	0.39	$	2.77	$	1.90