Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2017	Mar. 31, 2016
Statement of Comprehensive Income [Abstract]
Net earnings attributable to BorgWarner Inc.		$ 189.2	$ 164.1
Other comprehensive income (loss)
Foreign currency translation adjustments		49.0	68.4
Hedge instruments	[1]	(1.2)	1.7
Defined benefit postretirement plans	[1]	0.1	(0.2)
Other	[1]	0.0	(0.5)
Total other comprehensive income attributable to BorgWarner Inc.		47.9	69.4
Comprehensive income attributable to BorgWarner Inc.		237.1	233.5
Comprehensive income attributable to the noncontrolling interest		4.0	1.6
Comprehensive income		$ 241.1	$ 235.1

[1] Net of income taxes.