BorgWarner Inc. and Consolidated Subsidiaries Statements of Comprehensive Income - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement of Comprehensive Income [Abstract]
Net earnings attributable to BorgWarner Inc.		$ 930.7	$ 439.9	$ 595.0
Foreign currency translation adjustments		(147.6)	236.5	(109.1)
Hedge instruments	[1]	1.6	(6.3)	7.0
Defined benefit postretirement plans	[1]	(23.0)	0.5	(8.2)
Other	[1]	(1.1)	1.4	(1.6)
Total other comprehensive (loss) income attributable to BorgWarner Inc.		(170.1)	232.1	(111.9)
Comprehensive income attributable to BorgWarner Inc.	[1]	760.6	672.0	483.1
Net earnings attributable to the noncontrolling interest, net of tax		53.9	43.4	41.7
Other comprehensive (loss) income attributable to the noncontrolling interest	[1]	(7.9)	11.4	(5.1)
Comprehensive income		$ 806.6	$ 726.8	$ 519.7

[1] *Net of income taxes.