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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, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Numerator        
Net income (loss) attributable to AAM $ 117.2 $ (124.2) $ (597.3) $ (30.1)
Less: Net income attributable to participating securities (5.1) 0.0 0.0 0.0
Net income (loss) attributable to common shareholders - Basic and Dilutive $ 112.1 $ (124.2) $ (597.3) $ (30.1)
Denominators        
Basic - Weighted-average shares outstanding 118.4 115.8 117.7 115.6
Basic - Less: Participating securities (5.1) (3.3) (4.7) (3.3)
Basic - Weighted-average common shares outstanding 113.3 112.5 113.0 112.3
Effect of dilutive securities - dilutive stock-based compensation 0.0 0.0 0.0 0.0
Diluted - Adjusted weighted-average shares after assumed conversions 113.3 112.5 113.0 112.3
Basic EPS $ 0.99 $ (1.10) $ (5.28) $ (0.27)
Diluted EPS $ 0.99 $ (1.10) $ (5.28) $ (0.27)