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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, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Numerator        
Net income attributable to AAM $ 86.2 $ 61.7 $ 230.8 $ 193.8
Less: Net income attributable to participating securities (1.9) (1.4) (5.1) (4.4)
Net income attributable to common shareholders - Basic and Dilutive $ 84.3 $ 60.3 $ 225.7 $ 189.4
Denominators        
Basic - Weighted-average shares outstanding 113.9 78.3 101.5 78.2
Basic - Less: Participating securities (2.6) (1.8) (2.3) (1.8)
Basic - Weighted-average common shares outstanding 111.3 76.5 99.2 76.4
Effect of dilutive securities - dilutive stock-based compensation 0.4 0.5 0.4 0.4
Diluted - Adjusted weighted-average shares after assumed conversions 111.7 77.0 99.6 76.8
Basic EPS $ 0.76 $ 0.79 $ 2.28 $ 2.48
Diluted EPS $ 0.75 $ 0.78 $ 2.27 $ 2.47