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, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Income Statement [Abstract]
Net sales	$ 2,032.1	$ 1,806.2	$ 6,313.2	$ 5,551.2
Cost of sales	1,607.6	1,426.6	4,970.1	4,400.3
Gross profit	424.5	379.6	1,343.1	1,150.9
Selling, general and administrative expenses	174.5	157.7	529.5	472.6
Other expense (income), net	12.3	(3.7)	62.1	10.8
Operating income	237.7	225.6	751.5	667.5
Equity in affiliates’ earnings, net of tax	(14.8)	(10.4)	(35.8)	(31.2)
Interest income	(1.4)	(1.3)	(4.3)	(3.3)
Interest expense and finance charges	9.0	8.1	26.2	26.6
Earnings before income taxes and noncontrolling interest	244.9	229.2	765.4	675.4
Provision for income taxes	71.9	56.3	225.3	173.8
Net earnings	173.0	172.9	540.1	501.6
Net earnings attributable to the noncontrolling interest, net of tax	6.4	6.1	24.2	18.7
Net earnings attributable to BorgWarner Inc.	$ 166.6	$ 166.8	$ 515.9	$ 482.9
Earnings per share — basic	$ 0.73	$ 0.73	$ 2.27	$ 2.11
Earnings per share — diluted	$ 0.73	$ 0.72	$ 2.25	$ 2.08
Weighted average shares outstanding:
Basic	227,077	227,638	227,395	229,168
Diluted	228,668	230,476	229,222	231,936
Dividends declared per share	$ 0.13	$ 0.125	$ 0.38	$ 0.125