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Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Net income (loss)	$ (484.1)	$ (56.8)	$ 337.5
Other comprehensive income (loss)
Defined benefit plans, net of $3.0 million, $(9.8) million and $3.4 million of tax in 2019, 2018 and 2017, respectively	(18.3)	38.1	(8.5)
Foreign currency translation adjustments	(4.6)	(62.5)	88.3
Changes in cash flow hedges, net of tax of $6.1 million, $0.5 million and $(0.2) million in 2019, 2018 and 2017, respectively	(14.6)	5.5	17.1
Other comprehensive income (loss)	(37.5)	(18.9)	96.9
Comprehensive income (loss)	(521.6)	(75.7)	434.4
Net income attributable to noncontrolling interests	(0.4)	(0.7)	(0.4)
Comprehensive income (loss) attributable to AAM	$ (522.0)	$ (76.4)	$ 434.0

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