Condensed Consolidated Statements of Comprehensive Income (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014		Mar. 31, 2013
Statement of Comprehensive Income [Abstract]
Net earnings attributable to BorgWarner Inc.	$ 159.1		$ 142.0
Other comprehensive income (loss)
Foreign currency translation adjustments(a)	(2.7)	[1]	(84.8)	[1]
Hedge instruments(a)	(1.3)	[1]	11.1	[1]
Defined benefit postretirement plans(a)	1.2	[1]	5.8	[1]
Total other comprehensive loss attributable to BorgWarner Inc.	(2.8)		(67.9)
Comprehensive income attributable to BorgWarner Inc.	156.3		74.1
Comprehensive loss attributable to the noncontrolling interest	(1.1)		(1.2)
Comprehensive income	$ 155.2		$ 72.9

[1] Net of income taxes.