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Comprehensive Income (Loss) (Details) (USD $)
In Millions
3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Comprehensive income on an after-tax basis        
Foreign currency translation adjustments, net $ 40.1 $ (128.4) $ 131.3 $ (215.2)
Market value change in hedge instruments, net (6.8) (0.5) (10.6) 10.1
Unrealized gain on available-for-sale securities 0.2 0 0.2 0
Defined benefit post employment plans, net 0 0 (4.0) 0
Change in accumulated other comprehensive income (loss) 33.5 (128.9) 116.9 (205.1)
Net earnings attributable to BorgWarner Inc. 162.0 82.8 286.5 159.0
Comprehensive income (loss) 195.5 (46.1) 403.4 (46.1)
Comprehensive income attributable to the noncontrolling interest 1.3 (4.0) 2.7 (2.9)
Comprehensive income (loss) attributable to BorgWarner Inc. $ 196.8 $ (50.1) $ 406.1 $ (49.0)