Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Income Statement [Abstract]
Net sales	$ 2,279.0	$ 2,566.0
Cost of sales	1,832.0	2,047.0
Gross profit	447.0	519.0
Selling, general and administrative expenses	213.0	226.0
Other expense, net	45.0	29.0
Operating income	189.0	264.0
Equity in affiliates’ earnings, net of tax	(5.0)	(9.0)
Interest income	(2.0)	(3.0)
Interest expense	12.0	14.0
Other postretirement income	(2.0)	0.0
Earnings before income taxes and noncontrolling interest	186.0	262.0
Provision for income taxes	49.0	91.0
Net earnings	137.0	171.0
Net earnings attributable to the noncontrolling interest, net of tax	8.0	11.0
Net earnings attributable to BorgWarner Inc.	$ 129.0	$ 160.0
Earnings per share — basic	$ 0.63	$ 0.77
Earnings per share — diluted	$ 0.63	$ 0.77
Weighted Average Number of Shares Outstanding [Abstract]
Basic	205.7	206.5
Diluted	206.2	207.1