Earnings Per Share (Tables)

9 Months Ended

Sep. 30, 2012

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)	2012		2011		2012		2011
Basic earnings per share:
Net earnings attributable to BorgWarner Inc.	$	101.1	$	141.6	$	379.7	$	428.1
Weighted average shares of common stock outstanding	114.299		108.779		111.619		109.391
Basic earnings per share of common stock	$	0.88	$	1.30	$	3.40	$	3.91
Diluted earnings per share:
Net earnings attributable to BorgWarner Inc.	$	101.1	$	141.6	$	379.7	$	428.1
Adjustment for net interest expense on convertible notes	—		5.4		5.8		16.0
Diluted net earnings attributable to BorgWarner Inc.	$	101.1	$	147.0	$	385.5	$	444.1
Weighted average shares of common stock outstanding	114.299		108.779		111.619		109.391
Effect of 3.50% convertible senior notes	—		11.389		4.429		11.389
Effect of warrant	2.208		5.158		4.507		5.332
Effect of stock-based compensation	1.992		2.614		2.016		2.657
Total dilutive effect on weighted average shares of common stock outstanding	4.200		19.161		10.952		19.378
Weighted average shares of common stock outstanding including dilutive shares	118.499		127.940		122.571		128.769
Diluted earnings per share of common stock	$	0.85	$	1.15	$	3.15	$	3.45
Total anti-dilutive shares:
Call options	—		6.092		2.586		6.240