Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2016	Mar. 31, 2015
Statement of Comprehensive Income [Abstract]
Net earnings attributable to BorgWarner Inc.		$ 164.1	$ 178.9
Other comprehensive income (loss)
Foreign currency translation adjustments		68.4	(249.8)
Hedge instruments	[1]	1.7	4.2
Defined benefit postretirement plans	[1]	(0.2)	12.3
Other	[1]	(0.5)	0.0
Total other comprehensive income (loss) attributable to BorgWarner Inc.		69.4	(233.3)
Comprehensive income (loss) attributable to BorgWarner Inc.		233.5	(54.4)
Comprehensive income attributable to the noncontrolling interest		1.6	0.1
Comprehensive income (loss)		$ 235.1	$ (54.3)

[1] Net of income taxes.