Earnings Per Share (Tables)

6 Months Ended

Jun. 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 June 30,				Six Months Ended June 30,
(in millions, except per share amounts)	2012		2011		2012		2011
Basic earnings per share:
Net earnings attributable to BorgWarner Inc.	$	120.6	$	162.0	$	278.6	$	286.5
Weighted average shares of common stock outstanding	112.139		108.761		110.280		109.697
Basic earnings per share of common stock	$	1.08	$	1.49	$	2.53	$	2.61
Diluted earnings per share:
Net earnings attributable to BorgWarner Inc.	$	120.6	$	162.0	$	278.6	$	286.5
Adjustment for net interest expense on convertible notes	0.8		5.4		5.8		10.6
Diluted net earnings attributable to BorgWarner Inc.	$	121.4	$	167.4	$	284.4	$	297.1
Weighted average shares of common stock outstanding	112.139		108.761		110.280		109.697
Effect of 3.50% convertible senior notes	1.898		11.389		6.644		11.389
Effect of warrant	5.499		5.421		5.656		5.419
Effect of stock-based compensation	1.937		2.571		2.028		2.678
Total dilutive effect on weighted average shares of common stock outstanding	9.334		19.381		14.328		19.486
Weighted average shares of common stock outstanding including dilutive shares	121.473		128.142		124.608		129.183
Diluted earnings per share of common stock	$	1.00	$	1.31	$	2.28	$	2.30
Total anti-dilutive shares:
Call options	1.108		6.317		3.879		6.314