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Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Net loss	$ (561.1)	$ (484.1)	$ (56.8)
Other comprehensive income (loss)
Defined benefit plans, net of $12.7 million, $3.0 million and $(9.8) million of tax in 2020, 2019 and 2018, respectively	(51.1)	(18.3)	38.1
Foreign currency translation adjustments	(0.2)	(4.6)	(62.5)
Changes in cash flow hedges, net of tax of $1.3 million, $6.1 million and $0.5 million in 2020, 2019 and 2018, respectively	(4.4)	(14.6)	5.5
Other comprehensive loss	(55.7)	(37.5)	(18.9)
Comprehensive loss	(616.8)	(521.6)	(75.7)
Net income attributable to noncontrolling interests	(0.2)	(0.4)	(0.7)
Foreign currency translation adjustments attributable to noncontrolling interests	0.3	0.0	0.0
Comprehensive loss attributable to AAM	$ (616.7)	$ (522.0)	$ (76.4)

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