Earnings Per Share (Tables)

9 Months Ended

Sep. 30, 2013

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 September 30,				Nine Months Ended September 30,
(in millions, except per share amounts)	2013		2012		2013		2012
Basic earnings per share:
Net earnings attributable to BorgWarner Inc.	$	166.8	$	101.1	$	482.9	$	379.7
Weighted average shares of common stock outstanding	113.819		114.299		114.584		111.619
Basic earnings per share of common stock	$	1.47	$	0.88	$	4.21	$	3.40
Diluted earnings per share:
Net earnings attributable to BorgWarner Inc.	$	166.8	$	101.1	$	482.9	$	379.7
Adjustment for net interest expense on convertible notes	—		—		—		5.8
Diluted net earnings attributable to BorgWarner Inc.	$	166.8	$	101.1	$	482.9	$	385.5
Weighted average shares of common stock outstanding	113.819		114.299		114.584		111.619
Effect of 3.50% convertible senior notes	—		—		—		4.429
Effect of warrant	—		2.208		—		4.507
Effect of stock-based compensation	1.419		1.992		1.384		2.016
Total dilutive effect on weighted average shares of common stock outstanding	1.419		4.200		1.384		10.952
Weighted average shares of common stock outstanding including dilutive shares	115.238		118.499		115.968		122.571
Diluted earnings per share of common stock	$	1.45	$	0.85	$	4.16	$	3.15
Total anti-dilutive shares:
Call options	—		—		—		2.586