Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Income Statement [Abstract]
Net sales	$ 2,416.2	$ 2,214.2	$ 7,212.9	$ 6,812.0
Cost of sales	1,893.5	1,743.1	5,658.7	5,379.9
Gross profit	522.7	471.1	1,554.2	1,432.1
Selling, general and administrative expenses	224.8	209.7	658.6	600.4
Other expense, net	22.0	111.1	27.5	147.8
Operating income	275.9	150.3	868.1	683.9
Equity in affiliates’ earnings, net of tax	(14.4)	(12.4)	(38.5)	(31.6)
Interest income	(1.3)	(1.6)	(4.2)	(4.7)
Interest expense and finance charges	17.6	22.4	53.6	65.1
Earnings before income taxes and noncontrolling interest	274.0	141.9	857.2	655.1
Provision for income taxes	79.4	48.8	241.9	213.4
Net earnings	194.6	93.1	615.3	441.7
Net earnings attributable to the noncontrolling interest, net of tax	9.7	9.8	29.2	29.9
Net earnings attributable to BorgWarner Inc.	$ 184.9	$ 83.3	$ 586.1	$ 411.8
Earnings per share — basic	$ 0.88	$ 0.39	$ 2.78	$ 1.91
Earnings per share — diluted	$ 0.88	$ 0.39	$ 2.77	$ 1.90
Weighted average shares outstanding (thousands):
Basic	209,803	212,872	210,657	215,332
Diluted	211,013	213,766	211,575	216,189
Dividends declared per share	$ 0.14	$ 0.13	$ 0.42	$ 0.39