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Earnings Per Share (EPS) (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Numerator [Abstract]      
Net income (loss) attributable to AAM $ (57.5) $ 337.1 $ 240.7
Less: Net income (loss) attributable to participating securities 0.0 (7.5) (5.5)
Net income (loss) attributable to common shareholders - Basic and Dilutive $ (57.5) $ 329.6 $ 235.2
Denominator [Abstract]      
Weighted-average shares outstanding 115.0 104.6 78.2
Less: Participating securities (3.4) (2.3) (1.8)
Weighted-average common shares outstanding 111.6 102.3 76.4
Dilutive stock-based compensation 0.0 0.5 0.5
Diluted shares outstanding - adjusted weighted-average shares after assumed conversions 111.6 102.8 76.9
Basic earnings (loss) per share $ (0.51) $ 3.22 $ 3.08
Diluted earnings (loss) per share $ (0.51) $ 3.21 $ 3.06