Earnings Per Share (Tables)

9 Months Ended

Sep. 30, 2011

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)	2011		2010		2011		2010
Basic earnings per share:
Net earnings attributable to BorgWarner Inc.	$	141.6	$	106.7	$	428.1	$	265.7
Weighted average shares of common stock outstanding	108.779		112.757		109.391		114.831
Basic earnings per share of common stock	$	1.30	$	0.95	$	3.91	$	2.31
Diluted earnings per share:
Net earnings attributable to BorgWarner Inc.	$	141.6	$	106.7	$	428.1	$	265.7
Adjustment for net interest expense on convertible notes	5.4		5.0		16.0		15.1
Diluted net earnings attributable to BorgWarner Inc.	$	147.0	$	111.7	$	444.1	$	280.8
Weighted average shares of common stock outstanding	108.779		112.757		109.391		114.831
Effect of 3.50% convertible notes	11.389		11.389		11.389		11.389
Effect of warrant	5.158		1.596		5.332		0.584
Effect of stock-based compensation	2.614		2.062		2.657		1.731
Total dilutive effect on weighted average shares of common stock outstanding	19.161		15.047		19.378		13.704
Weighted average shares of common stock outstanding including dilutive shares	127.940		127.804		128.769		128.535
Diluted earnings per share of common stock	$	1.15	$	0.87	$	3.45	$	2.18
Total anti-dilutive shares:
Bond hedge	6.092		3.064		6.240		2.037