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Earnings Per Share (EPS) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Numerator [Abstract]
Net income (loss) attributable to AAM	$ (484.5)	$ (57.5)	$ 337.1
Less: Net income allocated to participating securities	0.0	0.0	(7.5)
Net income (loss) attributable to common shareholders - Basic and Dilutive	$ (484.5)	$ (57.5)	$ 329.6
Denominator [Abstract]
Weighted-average shares outstanding	115.6	115.0	104.6
Less: Participating securities	(3.3)	(3.4)	(2.3)
Weighted-average common shares outstanding	112.3	111.6	102.3
Dilutive stock-based compensation	0.0	0.0	0.5
Diluted shares outstanding - adjusted weighted-average shares after assumed conversions	112.3	111.6	102.8
Basic earnings (loss) per share	$ (4.31)	$ (0.51)	$ 3.22
Diluted earnings (loss) per share	$ (4.31)	$ (0.51)	$ 3.21

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