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Earnings Per Share (Details) (USD $) In Millions, except Per Share data, unless otherwise specified | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2012 | Jun. 30, 2011 | Mar. 31, 2011 | Jun. 30, 2012 | Jun. 30, 2011 | Dec. 31, 2009
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |  |
Net income attributable to AAM | $ 4.7 | $ 49.2 |  | $ 55.9 | $ 86.9 |
Weighted average number of shares outstanding, basic | 75.1 | 75.4 |  | 75.1 | 74.5 |
Dilutive securities, effect on basic earnings per share, including Options and Restrictive Stock Units | 0 | 0 |  | 0 | 0.2 |
Dilutive securities, effect on basic earnings per share | $ 0 | $ 0 |  | $ 0 | $ 0.7 |
Weighted average number of shares outstanding, diluted | 75.1 | 75.4 |  | 75.1 | 75.4 |
Basic earnings per share | $ 0.06 | $ 0.65 |  | $ 0.74 | $ 1.17 |
Diluted earnings per share | $ 0.06 | $ 0.65 |  | $ 0.74 | $ 1.15 |
Earnings per share, Stock Options excluded from the calculation of diluted EPS | 3.3 | 4.1 |  | 3.3 | 4.1 |
Earnings per share, range of exercise prices of Stock Options excluded from the calculation of diluted EPS, lower end of range | $ 15.58 | $ 15.56 |  | $ 15.58 | $ 15.56 |
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 |  | $ 40.83 | $ 40.83 |
2009 GM Agreement, number of shares available for purchase through exercise of warrants |  |  |  |  |  | 4.1
2009 GM Agreement, exercise price of warrants issued to GM |  |  |  |  |  | $ 2.76
2009 GM Agreement, shares issued to GM through exercise of warrants |  |  | 3.3 |  |  |

X
- Definition Represents the exercise price of the warrants issued to GM as part of the 2009 Setlement and Commercial Agreement between AAM and GM. + References No definition available. + Details
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- Definition Represents the number of shares of AAM's common stock that GM was entitled to purchase, per the 2009 Settlement and Commercial Agreement between AAM and GM, through the exercise of warrants issued to GM. + References No definition available. + Details
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- Definition Represents the number of shares issued to GM during the period associated with the exercise by GM of the warrants issued as part of the 2009 Settlement and Commercial Agreement between AAM and GM. + References No definition available. + Details
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- Definition 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. + References No definition available. + Details
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- Definition Represents the number of exercisable stock options that were excluded from the calculation of diluted EPS because the exercise price was greater than the average annual market price of our stock. + References No definition available. + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 40 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Includes adjustments resulting from the assumption that dilutive convertible securities were converted, options or warrants were exercised, or that other shares were issued upon the satisfaction of certain conditions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 40 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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