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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, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Numerator
Net income (loss) attributable to AAM	$ (124.2)	$ 63.8	$ (30.1)	$ 304.3
Less: Net income attributable to participating securities	0.0	(2.0)	0.0	(8.9)
Net income (loss) attributable to common shareholders - Basic and Dilutive	$ (124.2)	$ 61.8	$ (30.1)	$ 295.4
Denominators
Basic - Weighted-average shares outstanding	115.8	115.3	115.6	115.0
Basic - Less: Participating securities	(3.3)	(3.6)	(3.3)	(3.4)
Basic - Weighted-average common shares outstanding	112.5	111.7	112.3	111.6
Effect of dilutive securities - dilutive stock-based compensation	0.0	1.0	0.0	0.7
Diluted - Adjusted weighted-average shares after assumed conversions	112.5	112.7	112.3	112.3
Basic EPS	$ (1.10)	$ 0.55	$ (0.27)	$ 2.65
Diluted EPS	$ (1.10)	$ 0.55	$ (0.27)	$ 2.63

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