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Earnings Per Share (EPS) (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Numerator [Abstract]      
Net income (loss) attributable to AAM $ 5.9 $ (561.3) $ (484.5)
Less: Net income allocated to participating securities (0.2) 0.0 0.0
Net income (loss) attributable to common shareholders - Basic and Dilutive $ 5.7 $ (561.3) $ (484.5)
Denominator [Abstract]      
Weighted-average shares outstanding 118.5 117.9 115.6
Less: Participating securities (4.6) (4.8) (3.3)
Weighted-average common shares outstanding 113.9 113.1 112.3
Dilutive stock-based compensation 0.2 0.0 0.0
Diluted shares outstanding - adjusted weighted-average shares after assumed conversions 114.1 113.1 112.3
Basic earnings (loss) per share $ 0.05 $ (4.96) $ (4.31)
Diluted earnings (loss) per share $ 0.05 $ (4.96) $ (4.31)