Condensed Consolidated Statements of Operations (Unaudited) (USD $) In Millions, except Share data in Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Income Statement [Abstract]
Net sales	$ 1,984.2	$ 2,084.1
Cost of sales	1,555.2	1,638.3
Gross profit	429.0	445.8
Selling, general and administrative expenses	168.2	173.8
Other expense, net	1.2	38.8
Operating income	259.6	233.2
Equity in affiliates’ earnings, net of tax	(8.5)	(8.8)
Interest income	(1.7)	(1.5)
Interest expense and finance charges	10.0	8.2
Earnings before income taxes and noncontrolling interest	259.8	235.3
Provision for income taxes	72.1	68.1
Net earnings	187.7	167.2
Net earnings attributable to the noncontrolling interest, net of tax	8.8	8.1
Net earnings attributable to BorgWarner Inc.	$ 178.9	$ 159.1
Earnings per share — basic	$ 0.79	$ 0.70
Earnings per share — diluted	$ 0.79	$ 0.69
Weighted average shares outstanding (thousands):
Basic	225,796	227,430
Diluted	227,088	229,327
Dividends declared per share	$ 0.13	$ 0.125