Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Income Statement [Abstract]
Net sales	$ 2,389.7	$ 2,329.2	$ 4,796.7	$ 4,597.8
Cost of sales	1,875.5	1,832.5	3,765.2	3,636.8
Gross profit	514.2	496.7	1,031.5	961.0
Selling, general and administrative expenses	215.0	202.3	433.8	390.7
Other (income) expense, net	(0.3)	25.0	5.5	36.7
Operating income	299.5	269.4	592.2	533.6
Equity in affiliates’ earnings, net of tax	(14.4)	(10.1)	(24.1)	(19.2)
Interest income	(1.4)	(1.5)	(2.9)	(3.1)
Interest expense and finance charges	18.0	21.4	36.0	42.7
Earnings before income taxes and noncontrolling interest	297.3	259.6	583.2	513.2
Provision for income taxes	76.2	84.2	162.5	164.6
Net earnings	221.1	175.4	420.7	348.6
Net earnings attributable to the noncontrolling interest, net of tax	9.1	11.0	19.5	20.1
Net earnings attributable to BorgWarner Inc.	$ 212.0	$ 164.4	$ 401.2	$ 328.5
Earnings per share — basic	$ 1.01	$ 0.76	$ 1.90	$ 1.52
Earnings per share — diluted	$ 1.00	$ 0.76	$ 1.89	$ 1.51
Weighted average shares outstanding (thousands):
Basic	210,572	215,735	211,084	216,562
Diluted	211,478	216,663	211,857	217,401
Dividends declared per share	$ 0.14	$ 0.13	$ 0.28	$ 0.26