Earnings Per Share (Tables)

6 Months Ended

Jun. 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 June 30,				Six Months Ended June 30,
(in millions, except per share amounts)	2013		2012		2013		2012
Basic earnings per share:
Net earnings attributable to BorgWarner Inc.	$	174.1	$	120.6	$	316.1	$	278.6
Weighted average shares of common stock outstanding	114.748		112.139		114.967		110.280
Basic earnings per share of common stock	$	1.52	$	1.08	$	2.75	$	2.53
Diluted earnings per share:
Net earnings attributable to BorgWarner Inc.	$	174.1	$	120.6	$	316.1	$	278.6
Adjustment for net interest expense on convertible notes	—		0.8		—		5.8
Diluted net earnings attributable to BorgWarner Inc.	$	174.1	$	121.4	$	316.1	$	284.4
Weighted average shares of common stock outstanding	114.748		112.139		114.967		110.280
Effect of 3.50% convertible senior notes	—		1.898		—		6.644
Effect of warrant	—		5.499		—		5.656
Effect of stock-based compensation	1.353		1.937		1.366		2.028
Total dilutive effect on weighted average shares of common stock outstanding	1.353		9.334		1.366		14.328
Weighted average shares of common stock outstanding including dilutive shares	116.101		121.473		116.333		124.608
Diluted earnings per share of common stock	$	1.50	$	1.00	$	2.72	$	2.28
Total anti-dilutive shares:
Call options	—		1.108		—		3.879