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Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Numerator    
Net income attributable to AAM $ 89.4 $ 78.4
Less: Net income attributable to participating securities (2.2) (1.9)
Net income attributable to common shareholders - Basic and Dilutive $ 87.2 $ 76.5
Denominators    
Basic - Weighted-average shares outstanding 114.2 78.5
Basic - Less: Participating securities (2.8) (1.9)
Basic - Weighted-average common shares outstanding 111.4 76.6
Effect of dilutive securities - dilutive stock-based compensation 0.5 0.4
Diluted - Adjusted weighted-average shares after assumed conversions 111.9 77.0
Basic EPS $ 0.78 $ 1.00
Diluted EPS $ 0.78 $ 0.99