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Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Numerator    
Net income (loss) attributable to AAM $ 38.6 $ (501.3)
Less: Net income attributable to participating securities (1.6) 0.0
Net income (loss) attributable to common shareholders - Basic and Dilutive $ 37.0 $ (501.3)
Denominators    
Basic - Weighted-average shares outstanding 118.3 116.4
Basic - Less: Participating securities (4.8) (3.7)
Basic - Weighted-average common shares outstanding 113.5 112.7
Effect of dilutive securities - dilutive stock-based compensation 0.0 0.0
Diluted - Adjusted weighted-average shares after assumed conversions 113.5 112.7
Basic EPS $ 0.33 $ (4.45)
Diluted EPS $ 0.33 $ (4.45)