Earnings Per Share (Tables)

6 Months Ended

Jun. 30, 2018

Earnings Per Share [Abstract]

Schedule of Earnings Per Share Reconciliation

	Three Months Ended June 30,				Six Months Ended June 30,
(in millions, except per share amounts)	2018		2017		2018		2017
Basic earnings per share:
Net earnings attributable to BorgWarner Inc.	$	271.8	$	212.0	$	496.9	$	401.2
Weighted average shares of common stock outstanding	208.570		210.572		209.023		211.084
Basic earnings per share of common stock	$	1.30	$	1.01	$	2.38	$	1.90
Diluted earnings per share:
Net earnings attributable to BorgWarner Inc.	$	271.8	$	212.0	$	496.9	$	401.2
Weighted average shares of common stock outstanding	208.570		210.572		209.023		211.084
Effect of stock-based compensation	1.287		0.906		1.289		0.773
Weighted average shares of common stock outstanding including dilutive shares	209.857		211.478		210.312		211.857
Diluted earnings per share of common stock	$	1.30	$	1.00	$	2.36	$	1.89