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Unaudited Quarterly Financial Data (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Net sales									$ 7,270.4	$ 6,266.0	$ 3,948.0
Gross profit									1,140.4	1,119.1	726.1
Net Income (loss)									(56.8)	337.5	240.7
Net income (loss) attributable to AAM									$ (57.5)	$ 337.1	$ 240.7
Basic earnings (loss) per share									$ (0.51)	$ 3.22	$ 3.08
Diluted earnings (loss) per share									$ (0.51)	$ 3.21	$ 3.06
Goodwill, Impairment Loss, Net of Tax									$ 400.0
Quarterly Information [Member]
Net sales	$ 1,694.1	$ 1,817.0	$ 1,900.9	$ 1,858.4	$ 1,733.9	$ 1,724.4	$ 1,757.8	$ 1,049.9
Gross profit	225.3	267.4	331.4	316.3	294.3	297.7	316.4	210.7
Net Income (loss)	(361.6)	64.0	151.3	89.5	106.5	86.3	66.3	78.4
Net income (loss) attributable to AAM	$ (361.8)	$ 63.8	$ 151.1	$ 89.4	$ 106.3	$ 86.2	$ 66.2	$ 78.4
Basic earnings (loss) per share	$ (3.24)	$ 0.55	$ 1.31	$ 0.78	$ 0.93	$ 0.76	$ 0.59	$ 1.00
Diluted earnings (loss) per share	$ (3.24)	$ 0.55	$ 1.30	$ 0.78	$ 0.93	$ 0.75	$ 0.59	$ 0.99

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