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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, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Numerator        
Net income attributable to AAM $ 63.8 $ 86.2 $ 304.3 $ 230.8
Less: Net income attributable to participating securities (2.0) (1.9) (8.9) (5.1)
Net income attributable to common shareholders - Basic and Dilutive $ 61.8 $ 84.3 $ 295.4 $ 225.7
Denominators        
Basic - Weighted-average shares outstanding 115.3 113.9 115.0 101.5
Basic - Less: Participating securities (3.6) (2.6) (3.4) (2.3)
Basic - Weighted-average common shares outstanding 111.7 111.3 111.6 99.2
Effect of dilutive securities - dilutive stock-based compensation 1.0 0.4 0.7 0.4
Diluted - Adjusted weighted-average shares after assumed conversions 112.7 111.7 112.3 99.6
Basic EPS $ 0.55 $ 0.76 $ 2.65 $ 2.28
Diluted EPS $ 0.55 $ 0.75 $ 2.63 $ 2.27