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Long-Term Debt (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended 12 Months Ended 3 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Mar. 31, 2013
Mar. 20, 2013
Debt Instrument [Line Items]              
Debt, Long-term and Short-term, Combined Amount $ 1,542.6us-gaap_DebtLongtermAndShorttermCombinedAmount   $ 1,542.6us-gaap_DebtLongtermAndShorttermCombinedAmount   $ 1,559.1us-gaap_DebtLongtermAndShorttermCombinedAmount    
Long-term debt 1,525.5us-gaap_LongTermDebtAndCapitalLeaseObligations   1,525.5us-gaap_LongTermDebtAndCapitalLeaseObligations   1,559.1us-gaap_LongTermDebtAndCapitalLeaseObligations    
Payments of debt issuance costs     0.3us-gaap_PaymentsOfDebtIssuanceCosts 12.9us-gaap_PaymentsOfDebtIssuanceCosts      
Debt refinancing and redemption costs 0axl_OtherExpenseDebtRefinancingAndRedemptionCosts 0axl_OtherExpenseDebtRefinancingAndRedemptionCosts 0axl_OtherExpenseDebtRefinancingAndRedemptionCosts 11.2axl_OtherExpenseDebtRefinancingAndRedemptionCosts      
Long-term debt, weighted average interest rate 6.40%us-gaap_LongtermDebtWeightedAverageInterestRate   6.40%us-gaap_LongtermDebtWeightedAverageInterestRate   6.30%us-gaap_LongtermDebtWeightedAverageInterestRate    
Current portion of long-term debt 17.1us-gaap_LongTermDebtCurrent   17.1us-gaap_LongTermDebtCurrent   0us-gaap_LongTermDebtCurrent    
6.25% Notes [Member]              
Debt Instrument [Line Items]              
Payments of debt issuance costs       6.6us-gaap_PaymentsOfDebtIssuanceCosts
/ us-gaap_DebtInstrumentAxis
= axl_A625NotesMember
     
Revolving Credit Facility [Member]              
Debt Instrument [Line Items]              
Line of Credit Facility, Amount Outstanding 0us-gaap_LineOfCreditFacilityAmountOutstanding
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember
  0us-gaap_LineOfCreditFacilityAmountOutstanding
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember
  0us-gaap_LineOfCreditFacilityAmountOutstanding
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember
   
Line of credit facility, maximum borrowing capacity 523.5us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember
  523.5us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember
       
Line of credit facility, remaining borrowing capacity 505.5us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember
  505.5us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember
       
Secured Debt [Member] | Loans Payable [Member]              
Debt Instrument [Line Items]              
Notes payable 144.4us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= us-gaap_LoansPayableMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember
  144.4us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= us-gaap_LoansPayableMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember
  150.0us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= us-gaap_LoansPayableMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember
   
Debt Instrument, Periodic Payment, Principal     5.6us-gaap_DebtInstrumentPeriodicPaymentPrincipal
/ us-gaap_DebtInstrumentAxis
= us-gaap_LoansPayableMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember
       
Secured Debt [Member] | Revolving Credit Facility [Member]              
Debt Instrument [Line Items]              
Payments of debt issuance costs     0.1us-gaap_PaymentsOfDebtIssuanceCosts
/ us-gaap_DebtInstrumentAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember
       
Secured Debt [Member] | 9.25% Notes [Member]              
Debt Instrument [Line Items]              
Debt instrument, interest rate, stated percentage 9.25%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= axl_A925NotesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember
  9.25%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= axl_A925NotesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember
       
Debt instrument, redemption amount         190.0axl_DebtInstrumentRedemptionAmount
/ us-gaap_DebtInstrumentAxis
= axl_A925NotesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember
   
Unsecured Debt [Member] | 7.875% Notes [Member]              
Debt Instrument [Line Items]              
Debt instrument, interest rate, stated percentage 7.875%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= axl_A7875NotesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember
  7.875%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= axl_A7875NotesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember
       
Debt Instrument, Tender and Redemption Premiums           8.5axl_DebtInstrumentTenderandRedemptionPremiums
/ us-gaap_DebtInstrumentAxis
= axl_A7875NotesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember
 
Professional Fees           0.1us-gaap_ProfessionalFees
/ us-gaap_DebtInstrumentAxis
= axl_A7875NotesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember
 
Write off of Deferred Debt Issuance Cost           2.1us-gaap_WriteOffOfDeferredDebtIssuanceCost
/ us-gaap_DebtInstrumentAxis
= axl_A7875NotesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember
 
Debt instrument, decrease, repayments           300.0us-gaap_RepaymentsOfDebt
/ us-gaap_DebtInstrumentAxis
= axl_A7875NotesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember
 
Unsecured Debt [Member] | 5.125% Notes [Member]              
Debt Instrument [Line Items]              
Notes payable 200.0us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= axl_A5.125NotesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember
  200.0us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= axl_A5.125NotesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember
  200.0us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= axl_A5.125NotesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember
   
Debt instrument, interest rate, stated percentage 5.125%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= axl_A5.125NotesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember
  5.125%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= axl_A5.125NotesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember
       
Payments of debt issuance costs     0.2us-gaap_PaymentsOfDebtIssuanceCosts
/ us-gaap_DebtInstrumentAxis
= axl_A5.125NotesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember
       
Unsecured Debt [Member] | 7.75% Notes [Member]              
Debt Instrument [Line Items]              
Notes payable 200.0us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= axl_A775NotesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember
  200.0us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= axl_A775NotesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember
  200.0us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= axl_A775NotesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember
   
Unsecured Debt [Member] | 6.625% Notes [Member]              
Debt Instrument [Line Items]              
Notes payable 550.0us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= axl_A6625NotesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember
  550.0us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= axl_A6625NotesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember
  550.0us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= axl_A6625NotesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember
   
Unsecured Debt [Member] | 6.25% Notes [Member]              
Debt Instrument [Line Items]              
Notes payable 400.0us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= axl_A625NotesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember
  400.0us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= axl_A625NotesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember
  400.0us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= axl_A625NotesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember
   
Debt instrument, interest rate, stated percentage 6.25%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= axl_A625NotesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember
  6.25%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= axl_A625NotesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember
       
Foreign Credit Facilities [Member]              
Debt Instrument [Line Items]              
Line of Credit Facility, Amount Outstanding 43.2us-gaap_LineOfCreditFacilityAmountOutstanding
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ForeignLineOfCreditMember
  43.2us-gaap_LineOfCreditFacilityAmountOutstanding
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ForeignLineOfCreditMember
  53.8us-gaap_LineOfCreditFacilityAmountOutstanding
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ForeignLineOfCreditMember
   
Notes payable 43.2us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ForeignLineOfCreditMember
  43.2us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ForeignLineOfCreditMember
       
Debt instrument, unused borrowing capacity, amount 49.2us-gaap_DebtInstrumentUnusedBorrowingCapacityAmount
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ForeignLineOfCreditMember
  49.2us-gaap_DebtInstrumentUnusedBorrowingCapacityAmount
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ForeignLineOfCreditMember
       
Capital Lease Obligations [Member]              
Debt Instrument [Line Items]              
Capital lease obligations 5.0us-gaap_CapitalLeaseObligations
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_CapitalLeaseObligationsMember
  5.0us-gaap_CapitalLeaseObligations
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_CapitalLeaseObligationsMember
  5.3us-gaap_CapitalLeaseObligations
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_CapitalLeaseObligationsMember
   
Class C [Member] | Revolving Credit Facility [Member]              
Debt Instrument [Line Items]              
Write off of Deferred Debt Issuance Cost           0.5us-gaap_WriteOffOfDeferredDebtIssuanceCost
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember
/ axl_TrancheAxis
= axl_ClassCMember
 
Line of credit facility, reduction in borrowing capacity, termination of loan facility             72.8axl_Lineofcreditfacilityreductioninborrowingcapacityterminationofloanfacility
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember
/ axl_TrancheAxis
= axl_ClassCMember
Class D [Member] | Revolving Credit Facility [Member]              
Debt Instrument [Line Items]              
Line of credit facility, standby letters of credit issued against the facility $ 18.0axl_LineOfCreditFacilityStandbyLettersOfCreditIssuedAgainstFacility
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember
/ axl_TrancheAxis
= axl_ClassDMember
  $ 18.0axl_LineOfCreditFacilityStandbyLettersOfCreditIssuedAgainstFacility
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember
/ axl_TrancheAxis
= axl_ClassDMember