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Product Warranty Liabilities - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended 1 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Jun. 30, 2007
Dec. 31, 2011
Guarantor Obligations [Line Items]          
Product warranty liability, current $ 24.0us-gaap_ProductWarrantyAccrualClassifiedCurrent $ 37.4us-gaap_ProductWarrantyAccrualClassifiedCurrent      
Product warranty liability, non-current 59.6us-gaap_ProductWarrantyAccrualNoncurrent 53.1us-gaap_ProductWarrantyAccrualNoncurrent      
Increase (decrease) in extended Product liability 3.9us-gaap_ExtendedProductWarrantyAccrualPeriodIncreaseDecrease 8.2us-gaap_ExtendedProductWarrantyAccrualPeriodIncreaseDecrease (7.9)us-gaap_ExtendedProductWarrantyAccrualPeriodIncreaseDecrease    
Product warranty accrual reduction charged to DPIM receivable     7.3alsn_ProductWarrantyAccrualReductionChargedToDualPowerInverterModuleReceivable    
Product warranty accrual reduction charged to comprehensive income (1.0)alsn_ProductWarrantyAccrualReductionChargedToComprehensiveIncome 2.4alsn_ProductWarrantyAccrualReductionChargedToComprehensiveIncome 0.6alsn_ProductWarrantyAccrualReductionChargedToComprehensiveIncome    
Warranty liability 83.6us-gaap_ProductWarrantyAccrual 90.5us-gaap_ProductWarrantyAccrual 109.7us-gaap_ProductWarrantyAccrual   115.4us-gaap_ProductWarrantyAccrual
Warranty claims paid 35.0us-gaap_ProductWarrantyAccrualPayments 38.7us-gaap_ProductWarrantyAccrualPayments 47.3us-gaap_ProductWarrantyAccrualPayments    
Product warranty accrual additional reserve     10.0alsn_ProductWarrantyAccrualAdditionalReserve    
Extended Product warranty, charge to the Consolidated Statements of Comprehensive Income (Loss)     10.0alsn_ProductWarrantyAccrualAdditionalReserveChargeToComprehensiveIncomeLoss    
General Motors          
Guarantor Obligations [Line Items]          
Product warranty accrual reduction charged to DPIM receivable 2.9alsn_ProductWarrantyAccrualReductionChargedToDualPowerInverterModuleReceivable
/ dei_LegalEntityAxis
= alsn_GeneralMotorsMember
5.8alsn_ProductWarrantyAccrualReductionChargedToDualPowerInverterModuleReceivable
/ dei_LegalEntityAxis
= alsn_GeneralMotorsMember
     
Reimbursement received 14.9us-gaap_ReimbursementRevenue
/ dei_LegalEntityAxis
= alsn_GeneralMotorsMember
9.1us-gaap_ReimbursementRevenue
/ dei_LegalEntityAxis
= alsn_GeneralMotorsMember
     
Dual Power Inverter Module          
Guarantor Obligations [Line Items]          
Product warranty, qualified cost       12.0alsn_ProductWarrantyQualifiedCost
/ us-gaap_GuaranteeObligationsByNatureAxis
= alsn_DualPowerInverterModuleMember
 
Product warranty, qualified cost sharing ratio       33.30%alsn_CostSharingPercentage
/ us-gaap_GuaranteeObligationsByNatureAxis
= alsn_DualPowerInverterModuleMember
 
Warranty liability 48.5us-gaap_ProductWarrantyAccrual
/ us-gaap_GuaranteeObligationsByNatureAxis
= alsn_DualPowerInverterModuleMember
44.6us-gaap_ProductWarrantyAccrual
/ us-gaap_GuaranteeObligationsByNatureAxis
= alsn_DualPowerInverterModuleMember
     
Warranty claims paid 32.8us-gaap_ProductWarrantyAccrualPayments
/ us-gaap_GuaranteeObligationsByNatureAxis
= alsn_DualPowerInverterModuleMember
25.5us-gaap_ProductWarrantyAccrualPayments
/ us-gaap_GuaranteeObligationsByNatureAxis
= alsn_DualPowerInverterModuleMember
     
Dual Power Inverter Module | General Motors          
Guarantor Obligations [Line Items]          
Product warranty, qualified cost       34.0alsn_ProductWarrantyQualifiedCost
/ us-gaap_GuaranteeObligationsByNatureAxis
= alsn_DualPowerInverterModuleMember
/ dei_LegalEntityAxis
= alsn_GeneralMotorsMember
 
Product warranty, qualified cost sharing ratio       66.70%alsn_CostSharingPercentage
/ us-gaap_GuaranteeObligationsByNatureAxis
= alsn_DualPowerInverterModuleMember
/ dei_LegalEntityAxis
= alsn_GeneralMotorsMember
 
Other receivable 28.7us-gaap_OtherReceivables
/ us-gaap_GuaranteeObligationsByNatureAxis
= alsn_DualPowerInverterModuleMember
/ dei_LegalEntityAxis
= alsn_GeneralMotorsMember
25.8us-gaap_OtherReceivables
/ us-gaap_GuaranteeObligationsByNatureAxis
= alsn_DualPowerInverterModuleMember
/ dei_LegalEntityAxis
= alsn_GeneralMotorsMember
     
Dual Power Inverter Module | Product Warranty          
Guarantor Obligations [Line Items]          
Product warranty, qualified cost       $ 46.0alsn_ProductWarrantyQualifiedCost
/ us-gaap_GuaranteeObligationsByNatureAxis
= alsn_DualPowerInverterModuleMember
/ dei_LegalEntityAxis
= alsn_ProductWarrantyMember