Condensed Consolidated Statements of Comprehensive (Loss) Income - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Statement of Comprehensive Income [Abstract]
Net earnings attributable to BorgWarner Inc.		$ 148.1	$ 190.2	$ 327.0	$ 349.3
Other comprehensive income (loss)
Foreign currency translation adjustments		84.2	(1.1)	(165.6)	(3.8)
Hedge instruments	[1]	(2.7)	0.7	1.5	(0.6)
Defined benefit postretirement plans	[1]	(4.3)	(1.3)	8.0	(0.1)
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax, Portion Attributable to Parent	[1]	0.2	(0.1)	0.2	(0.1)
Total other comprehensive income (loss) attributable to BorgWarner Inc.		77.4	(1.8)	(155.9)	(4.6)
Comprehensive income attributable to BorgWarner Inc.		225.5	188.4	171.1	344.7
Comprehensive (loss) income attributable to the noncontrolling interest		(0.7)	2.3	(0.6)	1.2
Comprehensive income		$ 224.8	$ 190.7	$ 170.5	$ 345.9

[1] Net of income taxes.