Condensed Consolidated Statements of Comprehensive (Loss) Income - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Statement of Comprehensive Income [Abstract]
Net earnings attributable to BorgWarner Inc.		$ 157.4	$ 166.6	$ 484.4	$ 515.9
Other comprehensive loss
Foreign currency translation adjustments		(37.0)	(196.1)	(202.6)	(199.9)
Hedge instruments	[1]	(3.0)	11.9	(1.5)	11.3
Defined benefit postretirement plans	[1]	2.8	2.9	10.8	2.8
Other	[1]	0.0	0.0	0.2	(0.1)
Total other comprehensive loss attributable to BorgWarner Inc.		(37.2)	(181.3)	(193.1)	(185.9)
Comprehensive income (loss) attributable to BorgWarner Inc.		120.2	(14.7)	291.3	330.0
Comprehensive loss attributable to the noncontrolling interest		(3.8)	(1.8)	(4.4)	(0.6)
Comprehensive income (loss)		$ 116.4	$ (16.5)	$ 286.9	$ 329.4

[1] Net of income taxes.