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Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Net income	$ 64.0	$ 86.3	$ 304.8	$ 231.0
Other comprehensive income (loss)
Defined benefit plans, net of tax (a)	1.0	3.1	14.5	3.7
Foreign currency translation adjustments	(11.9)	42.8	(55.0)	79.3
Changes in cash flow hedges, net of tax (b)	12.4	1.1	19.6	21.5
Other comprehensive income (loss)	1.5	47.0	(20.9)	104.5
Comprehensive income	65.5	133.3	283.9	335.5
Net income attributable to noncontrolling interests	(0.2)	(0.1)	(0.5)	(0.2)
Comprehensive income attributable to AAM	$ 65.3	$ 133.2	$ 283.4	$ 335.3

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