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Unaudited Quarterly Financial Data Unaudited Quarterly Financial Data (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
Net sales	$ 939.5us-gaap_SalesRevenueGoodsNet	$ 950.8us-gaap_SalesRevenueGoodsNet	$ 946.9us-gaap_SalesRevenueGoodsNet	$ 858.8us-gaap_SalesRevenueGoodsNet	$ 831.3us-gaap_SalesRevenueGoodsNet	$ 820.8us-gaap_SalesRevenueGoodsNet	$ 799.6us-gaap_SalesRevenueGoodsNet	$ 755.6us-gaap_SalesRevenueGoodsNet	$ 3,696.0us-gaap_SalesRevenueGoodsNet	$ 3,207.3us-gaap_SalesRevenueGoodsNet	$ 2,930.9us-gaap_SalesRevenueGoodsNet
Gross Profit	111.2us-gaap_GrossProfit	140.7us-gaap_GrossProfit	149.0us-gaap_GrossProfit	121.9us-gaap_GrossProfit	126.9us-gaap_GrossProfit	125.3us-gaap_GrossProfit	122.2us-gaap_GrossProfit	104.3us-gaap_GrossProfit	522.8us-gaap_GrossProfit	478.7us-gaap_GrossProfit	399.7us-gaap_GrossProfit
Net income	13.2us-gaap_ProfitLoss	44.0us-gaap_ProfitLoss	52.2us-gaap_ProfitLoss	33.6us-gaap_ProfitLoss	29.8us-gaap_ProfitLoss	31.6us-gaap_ProfitLoss	25.8us-gaap_ProfitLoss	7.3us-gaap_ProfitLoss	143.0us-gaap_ProfitLoss	94.5us-gaap_ProfitLoss	366.7us-gaap_ProfitLoss
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
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

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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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