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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

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