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Consolidated Statements of Comprehensive Income (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Net income	$ 143.0us-gaap_ProfitLoss	$ 94.5us-gaap_ProfitLoss	$ 366.7us-gaap_ProfitLoss
Other comprehensive income (loss), net of tax
Defined benefit plans, net of $23.2 million, $(41.3) million and $32.3 million of tax in 2014, 2013 and 2012, respectively	(42.7)us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax	76.6us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax	(58.9)us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax
Foreign currency translation adjustment	(30.3)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax	(26.2)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax	(9.4)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax
Change in derivatives	(7.7)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax	(2.0)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax	7.8us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax
Other comprehensive income (loss)	(80.7)us-gaap_OtherComprehensiveIncomeLossNetOfTax	48.4us-gaap_OtherComprehensiveIncomeLossNetOfTax	(60.5)us-gaap_OtherComprehensiveIncomeLossNetOfTax
Comprehensive Income	62.3us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	142.9us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	306.2us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest
Net loss attributable to noncontrolling interests	0us-gaap_NetIncomeLossAttributableToNoncontrollingInterest	0us-gaap_NetIncomeLossAttributableToNoncontrollingInterest	1.0us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
Foreign currency translation adjustments attributable to noncontrolling interests	0us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToNoncontrollingInterest	0us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToNoncontrollingInterest	0.3us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToNoncontrollingInterest
Comprehensive income (loss) attributable to AAM	$ 62.3us-gaap_ComprehensiveIncomeNetOfTax	$ 142.9us-gaap_ComprehensiveIncomeNetOfTax	$ 306.9us-gaap_ComprehensiveIncomeNetOfTax

X

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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