Earnings Per Share (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2013	Mar. 31, 2012
Numerator
Net income attributable to AAM	$ 7.3	$ 51.2
Denominator
Basic shares outstanding - weighted-average shares outstanding	76.2	75.0
Effect of dilutive securities - dilutive stock-based compensation	$ 0	$ 0
Diluted shares outstanding - adjusted weighted-average shares after assumed conversion	76.2	75.0
Basic EPS	$ 0.10	$ 0.68
Diluted EPS	$ 0.10	$ 0.68
Antidilutive securities excluded from computation of earnings per share, amount	2.3	3.3
Earnings per share, range of exercise prices of Stock Options excluded from the calculation of diluted EPS, lower end of range	$ 15.58	$ 15.58
Earnings per share, range of exercise prices of Stock Options excluded from the calculation of diluted EPS, upper end of range	$ 40.83	$ 40.83

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Represents the lower end of the range of exercise prices of stock options excluded from the calculation of diluted EPS during the period because the exercise price of these stock options was greater than the average annual market price of our stock.

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Represents the upper end of the range of exercise prices of stock options excluded from the calculation of diluted EPS during the period because the exercise price of these stock options was greater than the average annual market price of our stock.

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The amount resulting from the "as if" assumption that stock options or restrictive stock units were exercised for purposes of computing the dilutive effect of convertible securities.

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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