Condensed Consolidated Statements of Operations (Unaudited) (USD $) In Millions, except Share data in Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Income Statement [Abstract]
Net sales	$ 1,912.5	$ 1,730.4
Cost of sales	1,516.7	1,387.6
Gross profit	395.8	342.8
Selling, general and administrative expense	169.0	165.1
Other (income) expense	1.1	(1.6)
Operating income	225.7	179.3
Equity in affiliates’ earnings, net of tax	(9.2)	(8.4)
Interest income	(1.4)	(1.0)
Interest expense and finance charges	15.1	18.4
Earnings before income taxes and noncontrolling interest	221.2	170.3
Provision for income taxes	57.5	40.9
Net earnings	163.7	129.4
Net earnings attributable to the noncontrolling interest, net of tax	5.7	4.9
Net earnings attributable to BorgWarner Inc.	$ 158.0	$ 124.5
Earnings per share - basic	$ 1.46	$ 1.13
Earnings per share - diluted	$ 1.28	$ 1.00
Weighted average shares outstanding (thousands):
Basic	108,420	110,634
Diluted	127,742	130,224