Earnings Per Share (Tables)

3 Months Ended

Mar. 31, 2015

Earnings Per Share [Abstract]

Schedule of Earnings Per Share Reconciliation

The following table reconciles the numerators and denominators used to calculate basic and diluted earnings per share of common stock:

	Three Months Ended March 31,
(in millions, except per share amounts)	2015		2014
Basic earnings per share:
Net earnings attributable to BorgWarner Inc.	$	178.9	$	159.1
Weighted average shares of common stock outstanding	225.796		227.430
Basic earnings per share of common stock	$	0.79	$	0.70
Diluted earnings per share:
Net earnings attributable to BorgWarner Inc.	$	178.9	$	159.1
Weighted average shares of common stock outstanding	225.796		227.430
Effect of stock-based compensation	1.292		1.897
Weighted average shares of common stock outstanding including dilutive shares	227.088		229.327
Diluted earnings per share of common stock	$	0.79	$	0.69