Earnings Per Share (Tables)

6 Months Ended

Jun. 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 June 30,				Six Months Ended June 30,
(in millions, except per share amounts)	2011		2010		2011		2010
Basic earnings per share:
Net earnings attributable to BorgWarner Inc.	$	162.0	$	82.8	$	286.5	$	159.0
Weighted average shares of common stock outstanding	108.761		115.362		109.697		115.869
Basic earnings per share of common stock	$	1.49	$	0.72	$	2.61	$	1.37
Diluted earnings per share:
Net earnings attributable to BorgWarner Inc.	$	162.0	$	82.8	$	286.5	$	159.0
Adjustment for net interest expense on convertible notes	5.4		5.1		10.6		10.1
Diluted net earnings attributable to BorgWarner Inc.	$	167.4	$	87.9	$	297.1	$	169.1
Weighted average shares of common stock outstanding	108.761		115.362		109.697		115.869
Effect of 3.50% convertible notes	11.389		11.389		11.389		11.389
Effect of warrant	5.421		0.118		5.419		0.059
Effect of stock-based compensation	2.571		2.209		2.678		2.055
Total dilutive effect on weighted average shares of common stock outstanding	19.381		13.716		19.486		13.503
Weighted average shares of common stock outstanding including dilutive shares	128.142		129.078		129.183		129.372
Diluted earnings per share of common stock	$	1.31	$	0.68	$	2.30	$	1.31
Total anti-dilutive shares:
Bond hedge	6.317		1.808		6.314		1.526