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Earnings Per Share Earnings Per Share (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
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net income attributable to AAM | $ 13.2 us-gaap_NetIncomeLoss | $ 44.0 us-gaap_NetIncomeLoss | $ 52.2 us-gaap_NetIncomeLoss | $ 33.6 us-gaap_NetIncomeLoss | $ 29.8 us-gaap_NetIncomeLoss | $ 31.6 us-gaap_NetIncomeLoss | $ 25.8 us-gaap_NetIncomeLoss | $ 7.3 us-gaap_NetIncomeLoss | $ 143.0 us-gaap_NetIncomeLoss | $ 94.5 us-gaap_NetIncomeLoss | $ 367.7 us-gaap_NetIncomeLoss
Participating Securities, Distributed and Undistributed Earnings (Loss), Basic |  |  |  |  |  |  |  |  | (2.9)us-gaap_UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic | (1.9)us-gaap_UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic | (2.6)us-gaap_UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic
Net Income (Loss) Available to Common Stockholders, Basic |  |  |  |  |  |  |  |  | 140.1 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 92.6 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 365.1 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Undistributed Earnings (Loss) Allocated to Participating Securities, Diluted |  |  |  |  |  |  |  |  | 0 axl_Incomereallocatedtocommonshareholdersdilutive | 0 axl_Incomereallocatedtocommonshareholdersdilutive | 0 axl_Incomereallocatedtocommonshareholdersdilutive
Net Income (Loss) Available to Common Stockholders, Diluted |  |  |  |  |  |  |  |  | 140.1 us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted | 92.6 us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted | 365.1 us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted
weighted average common shares and participating securities outstanding - basic |  |  |  |  |  |  |  |  | 77.3 axl_Weightedaveragecommonsharesandparticipatingsecuritiesoutstandingbasic | 76.7 axl_Weightedaveragecommonsharesandparticipatingsecuritiesoutstandingbasic | 75.3 axl_Weightedaveragecommonsharesandparticipatingsecuritiesoutstandingbasic
Participating securities - basic |  |  |  |  |  |  |  |  | (1.6)axl_Participatingsecuritiesbasic | (1.5)axl_Participatingsecuritiesbasic | (0.5)axl_Participatingsecuritiesbasic
Basic shares outstanding - weighted average shares outstanding |  |  |  |  |  |  |  |  | 75.7 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 75.2 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 74.8 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Effect of dilutive securities - dilutive stock options |  |  |  |  |  |  |  |  | 0.2 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements | 0.1 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements | 0.1 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Diluted shares outstanding - adjusted weighted-average shares after assumed conversions |  |  |  |  |  |  |  |  | 75.9 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 75.3 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 74.9 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Basic earnings per share | $ 0.17 us-gaap_EarningsPerShareBasic | $ 0.57 us-gaap_EarningsPerShareBasic | $ 0.67 us-gaap_EarningsPerShareBasic | $ 0.44 us-gaap_EarningsPerShareBasic | $ 0.39 us-gaap_EarningsPerShareBasic | $ 0.41 us-gaap_EarningsPerShareBasic | $ 0.34 us-gaap_EarningsPerShareBasic | $ 0.10 us-gaap_EarningsPerShareBasic | $ 1.85 us-gaap_EarningsPerShareBasic | $ 1.23 us-gaap_EarningsPerShareBasic | $ 4.88 us-gaap_EarningsPerShareBasic
Diluted earnings per share | $ 0.17 us-gaap_EarningsPerShareDiluted | $ 0.57 us-gaap_EarningsPerShareDiluted | $ 0.67 us-gaap_EarningsPerShareDiluted | $ 0.44 us-gaap_EarningsPerShareDiluted | $ 0.39 us-gaap_EarningsPerShareDiluted | $ 0.41 us-gaap_EarningsPerShareDiluted | $ 0.34 us-gaap_EarningsPerShareDiluted | $ 0.10 us-gaap_EarningsPerShareDiluted | $ 1.85 us-gaap_EarningsPerShareDiluted | $ 1.23 us-gaap_EarningsPerShareDiluted | $ 4.87 us-gaap_EarningsPerShareDiluted
Retained Earnings [Member] |  |  |  |  |  |  |  |  |  |  |
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net income attributable to AAM |  |  |  |  |  |  |  |  | $ 143.0 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | $ 94.5 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | $ 367.7 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember

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