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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, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Numerator        
Net income attributable to AAM $ 66.2 $ 71.0 $ 144.6 $ 132.1
Less: Net income attributable to participating securities (1.4) (1.7) (3.3) (3.0)
Net income attributable to common shareholders - Basic and Dilutive $ 64.8 $ 69.3 $ 141.3 $ 129.1
Denominators        
Basic - Weighted-average shares outstanding 111.6 78.3 95.2 78.1
Basic - Less: Participating securities (2.3) (1.8) (2.2) (1.8)
Basic - Weighted-average common shares outstanding 109.3 76.5 93.0 76.3
Effect of dilutive securities - dilutive stock-based compensation 0.4 0.4 0.4 0.4
Diluted - Adjusted weighted-average shares after assumed conversions 109.7 76.9 93.4 76.7
Basic EPS $ 0.59 $ 0.91 $ 1.52 $ 1.69
Diluted EPS $ 0.59 $ 0.90 $ 1.51 $ 1.68