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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, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Net income attributable to AAM	$ 319.9	$ (8.1)	$ 4.7	$ 51.2	$ 31.1	$ 24.8	$ 49.2	$ 37.7	$ 367.7	$ 142.8	$ 115.4
Weighted Average Number of Shares Outstanding, Basic									75.3	74.9	71.5
Dilutive Securities, Effect on Basic Earnings Per Share, Including Options and Restrictive Stock Units									0.1	0.1	0.1
Dilutive Securities, Effect on Basic Earnings Per Share									0	0.4	2.9
Weighted Average Number of Shares Outstanding, Diluted									75.4	75.4	74.5
Basic earnings per share	$ 4.21	$ (0.11)	$ 0.06	$ 0.68	$ 0.41	$ 0.33	$ 0.65	$ 0.51	$ 4.88	$ 1.91	$ 1.61
Diluted earnings per share	$ 4.21	$ (0.11)	$ 0.06	$ 0.68	$ 0.41	$ 0.33	$ 0.65	$ 0.50	$ 4.87	$ 1.89	$ 1.55
Retained Earnings [Member]
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Net income attributable to AAM									$ 367.7	$ 142.8	$ 115.4

X

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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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