Condensed Consolidated Statements of Operations (Unaudited) (USD $) In Millions, except Share data in Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Income Statement [Abstract]
Net sales	$ 1,791.8	$ 1,410.9	$ 5,341.0	$ 4,119.4
Cost of sales	1,441.0	1,137.6	4,290.3	3,332.2
Gross profit	350.8	273.3	1,050.7	787.2
Selling, general and administrative expense	151.4	150.2	474.2	418.3
Other (income) expense	0.6	0.1	(29.9)	22.0
Operating income	198.8	123.0	606.4	346.9
Equity in affiliates’ earnings, net of tax	(11.5)	(10.5)	(28.0)	(29.8)
Interest income	(1.3)	(0.6)	(3.5)	(1.8)
Interest expense and finance charges	18.5	18.4	57.4	46.8
Earnings before income taxes and noncontrolling interest	193.1	115.7	580.5	331.7
Provision for income taxes	46.4	4.2	137.1	51.1
Net earnings	146.7	111.5	443.4	280.6
Net earnings attributable to the noncontrolling interest, net of tax	5.1	4.8	15.3	14.9
Net earnings attributable to BorgWarner Inc.	$ 141.6	$ 106.7	$ 428.1	$ 265.7
Earnings per share - basic	$ 1.3	$ 0.95	$ 3.91	$ 2.31
Earnings per share - diluted	$ 1.15	$ 0.87	$ 3.45	$ 2.18
Weighted average shares outstanding (thousands):
Basic	108,779	112,757	109,391	114,831
Diluted	127,940	127,804	128,769	128,535