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Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Numerator        
Net income (loss) attributable to AAM $ (213.2) $ 52.5 $ (714.5) $ 94.1
Less: Net income attributable to participating securities 0.0 (1.5) 0.0 (2.7)
Net income (loss) attributable to common shareholders - Basic and Dilutive $ (213.2) $ 51.0 $ (714.5) $ 91.4
Denominators        
Basic - Weighted-average shares outstanding 118.4 115.8 117.4 115.6
Basic - Less: Participating securities (5.3) (3.3) (4.5) (3.4)
Basic - Weighted-average common shares outstanding 113.1 112.5 112.9 112.2
Effect of dilutive securities - dilutive stock-based compensation 0.0 0.3 0.0 0.4
Diluted - Adjusted weighted-average shares after assumed conversions 113.1 112.8 112.9 112.6
Basic EPS $ (1.88) $ 0.45 $ (6.33) $ 0.81
Diluted EPS $ (1.88) $ 0.45 $ (6.33) $ 0.81