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- Definition

Participating securities - basic

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- Definition

weighted average common shares and participating securities outstanding - basic

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No definition available.

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- Definition

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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- Definition

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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- Definition

Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

+ References

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- Definition

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

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-Glossary Other Comprehensive Income

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Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period).

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Net Income or Loss Available to Common Stockholders plus 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.

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Amount of undistributed earnings (loss) allocated to participating securities for the basic earnings (loss) per share or per unit calculation under the two-class method.

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

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Earnings Per Share Earnings Per Share (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Net income attributable to AAM	$ 13.2us-gaap_NetIncomeLoss	$ 44.0us-gaap_NetIncomeLoss	$ 52.2us-gaap_NetIncomeLoss	$ 33.6us-gaap_NetIncomeLoss	$ 29.8us-gaap_NetIncomeLoss	$ 31.6us-gaap_NetIncomeLoss	$ 25.8us-gaap_NetIncomeLoss	$ 7.3us-gaap_NetIncomeLoss	$ 143.0us-gaap_NetIncomeLoss	$ 94.5us-gaap_NetIncomeLoss	$ 367.7us-gaap_NetIncomeLoss
Participating Securities, Distributed and Undistributed Earnings (Loss), Basic									(2.9)	(1.9)	(2.6)
Net Income (Loss) Available to Common Stockholders, Basic									140.1	92.6	365.1
Undistributed Earnings (Loss) Allocated to Participating Securities, Diluted									0	0	0
Net Income (Loss) Available to Common Stockholders, Diluted									140.1	92.6	365.1
weighted average common shares and participating securities outstanding - basic									77.3	76.7	75.3
Participating securities - basic									(1.6)axl_Participatingsecuritiesbasic	(1.5)axl_Participatingsecuritiesbasic	(0.5)axl_Participatingsecuritiesbasic
Basic shares outstanding - weighted average shares outstanding									75.7	75.2	74.8
Effect of dilutive securities - dilutive stock options									0.2	0.1	0.1
Diluted shares outstanding - adjusted weighted-average shares after assumed conversions									75.9	75.3	74.9
Basic earnings per share	$ 0.17us-gaap_EarningsPerShareBasic	$ 0.57us-gaap_EarningsPerShareBasic	$ 0.67us-gaap_EarningsPerShareBasic	$ 0.44us-gaap_EarningsPerShareBasic	$ 0.39us-gaap_EarningsPerShareBasic	$ 0.41us-gaap_EarningsPerShareBasic	$ 0.34us-gaap_EarningsPerShareBasic	$ 0.10us-gaap_EarningsPerShareBasic	$ 1.85us-gaap_EarningsPerShareBasic	$ 1.23us-gaap_EarningsPerShareBasic	$ 4.88us-gaap_EarningsPerShareBasic
Diluted earnings per share	$ 0.17us-gaap_EarningsPerShareDiluted	$ 0.57us-gaap_EarningsPerShareDiluted	$ 0.67us-gaap_EarningsPerShareDiluted	$ 0.44us-gaap_EarningsPerShareDiluted	$ 0.39us-gaap_EarningsPerShareDiluted	$ 0.41us-gaap_EarningsPerShareDiluted	$ 0.34us-gaap_EarningsPerShareDiluted	$ 0.10us-gaap_EarningsPerShareDiluted	$ 1.85us-gaap_EarningsPerShareDiluted	$ 1.23us-gaap_EarningsPerShareDiluted	$ 4.87us-gaap_EarningsPerShareDiluted
Retained Earnings [Member]
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Net income attributable to AAM									$ 143.0	$ 94.5	$ 367.7