BorgWarner Inc. and Consolidated Subsidiaries Statements of Comprehensive Income (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Statement of Comprehensive Income [Abstract]
Net earnings attributable to BorgWarner Inc.	$ 655.8		$ 624.3		$ 500.9
Foreign currency translation adjustments	(341.8)		40.3		55.0
Hedge instruments	17.7	[1]	21.2	[1]	13.3	[1]
Defined benefit postretirement plans	(45.8)	[1]	44.3	[1]	(38.6)	[1]
Other	0.3	[1]	1.5	[1]	(0.2)	[1]
Total other comprehensive (loss) income attributable to BorgWarner Inc.	(369.6)		107.3		29.5
Comprehensive income attributable to BorgWarner Inc.	286.2		731.6		530.4
Comprehensive (loss) income attributable to the noncontrolling interest	(3.9)		1.7		2.8
Comprehensive income	$ 282.3		$ 733.3		$ 533.2

[1] *Net of income taxes.