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, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Income Statement [Abstract]
Net sales	$ 1,856.4	$ 1,818.8	$ 3,768.9	$ 3,549.2
Cost of sales	1,473.2	1,461.7	2,989.9	2,849.3
Gross profit	383.2	357.1	779.0	699.9
Selling, general and administrative expense	153.1	157.7	322.1	322.8
Other (income) expense	36.6	(28.9)	37.7	(30.5)
Operating income	193.5	228.3	419.2	407.6
Equity in affiliates’ earnings, net of tax	(12.5)	(8.1)	(21.7)	(16.5)
Interest income	(1.3)	(1.2)	(2.7)	(2.2)
Interest expense and finance charges	12.6	20.5	27.7	38.9
Earnings before income taxes and noncontrolling interest	194.7	217.1	415.9	387.4
Provision for income taxes	68.5	49.8	126.0	90.7
Net earnings	126.2	167.3	289.9	296.7
Net earnings attributable to the noncontrolling interest, net of tax	5.6	5.3	11.3	10.2
Net earnings attributable to BorgWarner Inc.	$ 120.6	$ 162.0	$ 278.6	$ 286.5
Earnings per share - basic	$ 1.08	$ 1.49	$ 2.53	$ 2.61
Earnings per share - diluted	$ 1.00	$ 1.31	$ 2.28	$ 2.30
Weighted average shares outstanding (thousands):
Basic	112,139	108,761	110,280	109,697
Diluted	121,473	128,142	124,608	129,183