Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Income Statement [Abstract]
Net sales	$ 2,784.3	$ 2,407.0
Cost of sales	2,192.5	1,890.7
Gross profit	591.8	516.3
Selling, general and administrative expenses	253.4	219.0
Other expense, net	4.9	5.8
Operating income	333.5	291.5
Equity in affiliates’ earnings, net of tax	(10.2)	(9.7)
Interest income	(1.5)	(1.5)
Interest expense and finance charges	16.1	18.0
Other postretirement income	(2.6)	(1.2)
Earnings before income taxes and noncontrolling interest	331.7	285.9
Provision for income taxes	94.9	86.3
Net earnings	236.8	199.6
Net earnings attributable to the noncontrolling interest, net of tax	11.7	10.4
Net earnings attributable to BorgWarner Inc.	$ 225.1	$ 189.2
Earnings per share — basic	$ 1.07	$ 0.89
Earnings per share — diluted	$ 1.07	$ 0.89
Weighted average shares outstanding (thousands):
Basic	209,475	211,596
Diluted	210,766	212,236
Dividends declared per share	$ 0.17	$ 0.14