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Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Numerator
Net income attributable to AAM	$ 41.6	$ 89.4
Less: Net income attributable to participating securities	(1.2)	(2.2)
Net income attributable to common shareholders - Basic and Dilutive	$ 40.4	$ 87.2
Denominators
Basic - Weighted-average shares outstanding	115.3	114.2
Basic - Less: Participating securities	(3.4)	(2.8)
Basic - Weighted-average common shares outstanding	111.9	111.4
Effect of dilutive securities - dilutive stock-based compensation	0.5	0.5
Diluted - Adjusted weighted-average shares after assumed conversions	112.4	111.9
Basic EPS	$ 0.36	$ 0.78
Diluted EPS	$ 0.36	$ 0.78

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