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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, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Numerator        
Net income attributable to AAM $ 151.1 $ 66.2 $ 240.5 $ 144.6
Less: Net income attributable to participating securities (4.9) (1.4) (6.8) (3.3)
Net income attributable to common shareholders - Basic and Dilutive $ 146.2 $ 64.8 $ 233.7 $ 141.3
Denominators        
Basic - Weighted-average shares outstanding 115.4 111.6 114.8 95.2
Basic - Less: Participating securities (3.7) (2.3) (3.3) (2.2)
Basic - Weighted-average common shares outstanding 111.7 109.3 111.5 93.0
Effect of dilutive securities - dilutive stock-based compensation 0.6 0.4 0.6 0.4
Diluted - Adjusted weighted-average shares after assumed conversions 112.3 109.7 112.1 93.4
Basic EPS $ 1.31 $ 0.59 $ 2.09 $ 1.52
Diluted EPS $ 1.30 $ 0.59 $ 2.08 $ 1.51