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Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Numerator
Net income (loss) attributable to AAM	$ (2.4)	$ 117.2	$ 52.2	$ (597.3)
Less: Net income attributable to participating securities	0.0	(5.1)	(2.0)	0.0
Net income (loss) attributable to common shareholders - Basic and Dilutive	$ (2.4)	$ 112.1	$ 50.2	$ (597.3)
Denominators
Basic - Weighted-average shares outstanding	118.5	118.4	118.5	117.7
Basic - Less: Participating securities	(4.4)	(5.1)	(4.6)	(4.7)
Basic - Weighted-average common shares outstanding	114.1	113.3	113.9	113.0
Effect of dilutive securities - dilutive stock-based compensation	0.0	0.0	0.2	0.0
Diluted - Adjusted weighted-average shares after assumed conversions	114.1	113.3	114.1	113.0
Basic EPS	$ (0.02)	$ 0.99	$ 0.44	$ (5.28)
Diluted EPS	$ (0.02)	$ 0.99	$ 0.44	$ (5.28)

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