Condensed Consolidated Statements of Comprehensive Income (USD $) In Millions, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014	Sep. 30, 2013
Statement of Comprehensive Income [Abstract]
Net earnings attributable to BorgWarner Inc.	$ 166.6		$ 166.8		$ 515.9	$ 482.9
Other comprehensive (loss) income
Foreign currency translation adjustments(a)	(196.1)	[1]	94.5	[1]	(199.9)	4.7
Hedge instruments(a)	11.9	[1]	0.4	[1]	11.3	14.0
Defined benefit postretirement plans(a)	2.9	[1]	1.9	[1]	2.8	11.1
Other(a)	0		0		(0.1)	0.5
Total other comprehensive (loss) income attributable to BorgWarner Inc.	(181.3)		96.8		(185.9)	30.3
Comprehensive (loss) income attributable to BorgWarner Inc.	(14.7)		263.6		330.0	513.2
Comprehensive (loss) income attributable to the noncontrolling interest	(1.8)		2.7		(0.6)	0.4
Comprehensive (loss) income	$ (16.5)		$ 266.3		$ 329.4	$ 513.6

[1] Net of income taxes.