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Earnings Per Share (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Net income (loss) attributable to AAM	$ 31.1	$ 24.8	$ 49.2	$ 37.7	$ 34.9	$ 38.8	$ 25.4	$ 16.3	$ 142.8	$ 115.4	$ (253.1)
Weighted Average Number of Shares Outstanding, Basic									74.9	71.5	52.6
Dilutive Securities, Effect on Basic Earnings Per Share, Including Options and Restrictive Stock Units									0.1	0.1	0
Dilutive Securities, Effect on Basic Earnings Per Share									0.4	2.9	0
Weighted Average Number of Shares Outstanding, Diluted									75.4	74.5	52.6
Earnings Per Share, Basic	$ 0.41	$ 0.33	$ 0.65	$ 0.51	$ 0.49	$ 0.54	$ 0.36	$ 0.23	$ 1.91	$ 1.61	$ (4.81)
Earnings Per Share, Diluted	$ 0.41	$ 0.33	$ 0.65	$ 0.50	$ 0.47	$ 0.52	$ 0.34	$ 0.22	$ 1.89	$ 1.55	$ (4.81)
Retained Earnings [Member]
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Net income (loss) attributable to AAM									$ 142.8	$ 115.4	$ (253.1)

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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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