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Earnings Per Share (EPS) (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Numerator [Abstract]      
Net income (loss) attributable to AAM $ 64.3 $ 5.9 $ (561.3)
Less: Net income allocated to participating securities (2.7) (0.2) 0.0
Net income (loss) attributable to common shareholders - Basic and Dilutive $ 61.6 $ 5.7 $ (561.3)
Denominator [Abstract]      
Weighted-average shares outstanding 119.4 118.5 117.9
Less: Participating securities (4.9) (4.6) (4.8)
Weighted-average common shares outstanding 114.5 113.9 113.1
Dilutive stock-based compensation 1.0 0.2 0.0
Diluted shares outstanding - adjusted weighted-average shares after assumed conversions 115.5 114.1 113.1
Basic earnings (loss) per share $ 0.54 $ 0.05 $ (4.96)
Diluted earnings (loss) per share $ 0.53 $ 0.05 $ (4.96)