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Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Numerator
Net income (loss) attributable to AAM	$ 16.0	$ (213.2)	$ 54.6	$ (714.5)
Less: Net income attributable to participating securities	(0.6)	0.0	(2.2)	0.0
Net income (loss) attributable to common shareholders - Basic and Dilutive	$ 15.4	$ (213.2)	$ 52.4	$ (714.5)
Denominators
Basic - Weighted-average shares outstanding	118.7	118.4	118.5	117.4
Basic - Less: Participating securities	(4.7)	(5.3)	(4.7)	(4.5)
Basic - Weighted-average common shares outstanding	114.0	113.1	113.8	112.9
Effect of dilutive securities - dilutive stock-based compensation	0.4	0.0	0.2	0.0
Diluted - Adjusted weighted-average shares after assumed conversions	114.4	113.1	114.0	112.9
Basic EPS	$ 0.13	$ (1.88)	$ 0.46	$ (6.33)
Diluted EPS	$ 0.13	$ (1.88)	$ 0.46	$ (6.33)

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