Comprehensive Income (Loss) (Details) (USD $) In Millions	3 Months Ended	9 Months Ended
Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Comprehensive income on an after-tax basis
Foreign currency translation adjustments, net	$ (147.5)	$ 175.7	$ (16.2)	$ (39.5)
Market value change in hedge instruments, net	(3.1)	(21.9)	(13.7)	(11.8)
Unrealized gain on available-for-sale securities	0	0	0.2	0
Defined benefit post employment plans, net	3.8	0	(0.2)	0
Change in accumulated other comprehensive income (loss)	(146.8)	153.8	(29.9)	(51.3)
Net earnings attributable to BorgWarner Inc.	141.6	106.7	428.1	265.7
Comprehensive income (loss)	(5.2)	260.5	398.2	214.4
Comprehensive income attributable to the noncontrolling interest	(4.1)	0.1	(1.4)	(2.8)
Comprehensive income (loss) attributable to BorgWarner Inc.	$ (9.3)	$ 260.6	$ 396.8	$ 211.6

The change in equity [net assets] of a business enterprise during a period from transactions and other events and circumstances from non-owner sources which are attributable to the reporting entity. It includes all changes in equity during a period except those resulting from investments by owners and distributions to owners, but excludes any and all transactions which are directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent.

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