Condensed Consolidated Statements of Operations (Unaudited) (USD $) In Millions, except Share data in Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Income Statement [Abstract]
Net sales	$ 1,818.8	$ 1,421.7	$ 3,549.2	$ 2,708.5
Cost of sales	1,461.7	1,146.3	2,849.3	2,194.6
Gross profit	357.1	275.4	699.9	513.9
Selling, general and administrative expense	157.7	137.8	322.8	268.1
Other (income) expense	(28.9)	20.3	(30.5)	21.9
Operating income	228.3	117.3	407.6	223.9
Equity in affiliates’ earnings, net of tax	(8.1)	(10.0)	(16.5)	(19.3)
Interest income	(1.2)	(0.6)	(2.2)	(1.2)
Interest expense and finance charges	20.5	14.2	38.9	28.4
Earnings before income taxes and noncontrolling interest	217.1	113.7	387.4	216.0
Provision for income taxes	49.8	26.0	90.7	46.9
Net earnings	167.3	87.7	296.7	169.1
Net earnings attributable to the noncontrolling interest, net of tax	5.3	4.9	10.2	10.1
Net earnings attributable to BorgWarner Inc.	$ 162.0	$ 82.8	$ 286.5	$ 159.0
Earnings per share - basic	$ 1.49	$ 0.72	$ 2.61	$ 1.37
Earnings per share - diluted	$ 1.31	$ 0.68	$ 2.3	$ 1.31
Weighted average shares outstanding (thousands):
Basic	108,761	115,362	109,697	115,869
Diluted	128,142	129,078	129,183	129,372