ALSN


Line plots across dimensions of each concept
Line plots across concepts
Tables

Table of contents


us-gaap:StatementClassOfStock
us-gaap:CommonStockValue

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic

us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount

us-gaap:EarningsPerShareBasic

us-gaap:EarningsPerShareDiluted

us-gaap:ComprehensiveIncomeNetOfTax

us-gaap:CostOfRevenue

us-gaap:GrossProfit

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents

us-gaap:IncomeTaxExpenseBenefit
us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents

us-gaap:IncomeTaxesPaidNet

us-gaap:InterestIncomeExpenseNet
us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents

us-gaap:InterestPaidNet

us-gaap:NetIncomeLoss
us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents
us-gaap:StatementEquityComponents

us-gaap:OperatingIncomeLoss

us-gaap:OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax
us-gaap:StatementEquityComponents

us-gaap:OtherComprehensiveIncomeLossNetOfTax
us-gaap:StatementEquityComponents

us-gaap:OtherNonoperatingIncomeExpense
us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents

us-gaap:ResearchAndDevelopmentExpense

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax
us-gaap:ProductOrService

us-gaap:SellingGeneralAndAdministrativeExpense

us-gaap:Assets
us-gaap:ConsolidatedEntities

us-gaap:Liabilities

us-gaap:LiabilitiesAndStockholdersEquity
us-gaap:ConsolidatedEntities

us-gaap:StockholdersEquity
us-gaap:StatementClassOfStock
us-gaap:StatementEquityComponents

us-gaap:AssetsCurrent

us-gaap:CashAndCashEquivalentsAtCarryingValue

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents

us-gaap:AccountsReceivableNetCurrent

us-gaap:InventoryNet

us-gaap:OtherAssetsCurrent

us-gaap:PropertyPlantAndEquipmentGross
us-gaap:PropertyPlantAndEquipmentByType

us-gaap:ConstructionInProgressGross

us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment

us-gaap:AmortizationOfIntangibleAssets

us-gaap:PropertyPlantAndEquipmentNet
us-gaap:StatementGeographical

us-gaap:Goodwill
us-gaap:IndefiniteLivedIntangibleAssetsByMajorClass
us-gaap:IndefiniteLivedIntangibleAssetsExcludingGoodwill

us-gaap:IntangibleAssetsNetExcludingGoodwill
us-gaap:FiniteLivedIntangibleAssetsByMajorClass
us-gaap:FiniteLivedIntangibleAssetsNet

us-gaap:IntangibleAssetsNetIncludingGoodwill

us-gaap:OperatingLeaseRightOfUseAsset
us-gaap:PropertyPlantAndEquipmentByType

us-gaap:OtherAssetsNoncurrent

us-gaap:AccountsPayableCurrent

us-gaap:ContractWithCustomerLiabilityCurrent
us-gaap:ProductOrService

us-gaap:LiabilitiesCurrent

us-gaap:LongTermDebtCurrent

us-gaap:OperatingLeaseLiabilityCurrent

us-gaap:OtherLiabilitiesCurrent

us-gaap:TaxesPayableCurrent

us-gaap:LongTermDebt
us-gaap:DebtInstrument

us-gaap:LongTermDebtNoncurrent

us-gaap:DeferredIncomeTaxLiabilitiesNet
us-gaap:RetirementPlanType
us-gaap:PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent

us-gaap:OtherLiabilitiesNoncurrent

us-gaap:OperatingLeaseLiabilityNoncurrent

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive

us-gaap:OperatingLeaseLiability

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue

us-gaap:LesseeOperatingLeaseLiabilityUndiscountedExcessAmount

us-gaap:StockholdersEquity
us-gaap:StatementClassOfStock
us-gaap:StatementEquityComponents
us-gaap:StatementClassOfStock
us-gaap:CommonStockValue

us-gaap:AdditionalPaidInCapitalCommonStock
us-gaap:ConsolidatedEntities

us-gaap:RetainedEarningsAccumulatedDeficit
us-gaap:ConsolidatedEntities

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax
us-gaap:ConsolidatedEntities

us-gaap:StockIssuedDuringPeriodValueNewIssues
us-gaap:StatementEquityComponents

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
us-gaap:StatementEquityComponents

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect

us-gaap:AmortizationOfFinancingCosts

us-gaap:DeferredIncomeTaxExpenseBenefit

us-gaap:IncreaseDecreaseInAccountsPayable

us-gaap:IncreaseDecreaseInAccountsReceivable

us-gaap:IncreaseDecreaseInInventories

us-gaap:IncreaseDecreaseInOtherOperatingCapitalNet

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetIncomeLoss
us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents
us-gaap:StatementEquityComponents

us-gaap:ShareBasedCompensation

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:PaymentsToAcquirePropertyPlantAndEquipment

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:PaymentsOfDividends

us-gaap:PaymentsForRepurchaseOfCommonStock

us-gaap:EffectiveIncomeTaxRateContinuingOperations

us-gaap:DeferredTaxLiabilities

us-gaap:UnrecognizedTaxBenefits

us-gaap:DeferredTaxAssetsValuationAllowance

alsn:ContractWithCustomerLiabilityIncrease

alsn:OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAndDerivativesAdjustmentNetOfTax
us-gaap:StatementEquityComponents

alsn:PaymentsForProceedsFromBusinessAcquisitions
us-gaap:StatementGeographical, us-gaap:ConcentrationRiskByBenchmark, us-gaap:ConcentrationRiskByType
us-gaap:ConcentrationRiskPercentage1

us-gaap:ContractWithCustomerLiabilityRevenueRecognized
us-gaap:DebtInstrument
us-gaap:DebtInstrumentPeriodicPaymentPrincipal
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAmortizationOfPriorServiceCostCredit
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanExpectedReturnOnPlanAssets
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanInterestCost
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanServiceCost

us-gaap:Depreciation

us-gaap:DividendsCommonStockCash
us-gaap:StatementEquityComponents

us-gaap:EffectOfExchangeRateOnCashAndCashEquivalents

us-gaap:GoodwillPeriodIncreaseDecrease
us-gaap:BusinessAcquisition

us-gaap:GoodwillPurchaseAccountingAdjustments

us-gaap:IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
us-gaap:DebtInstrument
us-gaap:LineOfCreditFacilityIncreaseDecreaseForPeriodNet

us-gaap:OperatingLeaseExpense

us-gaap:OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax
us-gaap:StatementEquityComponents

us-gaap:OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax
us-gaap:StatementEquityComponents

us-gaap:OtherComprehensiveIncomeLossTax
us-gaap:StatementEquityComponents

us-gaap:OtherNoncashIncomeExpense

us-gaap:PaymentsRelatedToTaxWithholdingForShareBasedCompensation

us-gaap:ProceedsFromLongTermLinesOfCredit
us-gaap:BusinessAcquisition
us-gaap:ProceedsFromPreviousAcquisition

us-gaap:ProceedsFromStockOptionsExercised

us-gaap:ProductWarrantyAccrualPayments

us-gaap:ProductWarrantyAccrualPreexistingIncreaseDecrease

us-gaap:ProductWarrantyAccrualWarrantiesIssued

us-gaap:ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax
us-gaap:StatementEquityComponents

us-gaap:RepaymentsOfLongTermLinesOfCredit

us-gaap:RepaymentsOfSeniorDebt

us-gaap:StockRepurchasedAndRetiredDuringPeriodValue
us-gaap:StatementEquityComponents
us-gaap:ShareRepurchaseProgram
us-gaap:StockRepurchasedDuringPeriodValue

alsn:LesseeOperatingLeaseLiabilityPaymentsThereafter

alsn:MilitaryPriceReductionReserveCurrentAndNonCurrent

alsn:NonTradePayableCurrent

alsn:SalesAllowances

alsn:VendorBuybackObligation

alsn:VendorLiabilityCurrent

alsn:WorldwideIndependentDistributorAndDealerLocations

dei:EntityNumberOfEmployees

us-gaap:AllowanceForDoubtfulAccountsReceivableCurrent

us-gaap:AociBeforeTaxAttributableToParent
us-gaap:DerivativeInstrumentRisk

us-gaap:AociTaxAttributableToParent

us-gaap:AssetsHeldInTrust
us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:CashAndCashEquivalentsFairValueDisclosure
us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:ConstructionLoan

us-gaap:ContractWithCustomerLiability

us-gaap:ContractWithCustomerLiabilityNoncurrent
us-gaap:ProductOrService
us-gaap:DebtInstrument
us-gaap:DebtInstrumentInterestRateEffectivePercentage

us-gaap:DeferredCompensationCashbasedArrangementsLiabilityCurrentAndNoncurrent
us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:DeferredFinanceCostsNet
us-gaap:LongtermDebtType

us-gaap:DeferredIncomeTaxLiabilities

us-gaap:DeferredTaxAssetsDeferredIncome

us-gaap:DeferredTaxAssetsGoodwillAndIntangibleAssets

us-gaap:DeferredTaxAssetsGross

us-gaap:DeferredTaxAssetsHedgingTransactions

us-gaap:DeferredTaxAssetsInventory

us-gaap:DeferredTaxAssetsInvestments

us-gaap:DeferredTaxAssetsOperatingLossCarryforwards

us-gaap:DeferredTaxAssetsOther

us-gaap:DeferredTaxAssetsTaxCreditCarryforwards

us-gaap:DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost

us-gaap:DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities

us-gaap:DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsReturnsAndAllowances

us-gaap:DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsWarrantyReserves

us-gaap:DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsGoodwill

us-gaap:DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets

us-gaap:DeferredTaxLiabilitiesOther

us-gaap:DeferredTaxLiabilitiesPropertyPlantAndEquipment

us-gaap:DeferredTaxLiabilitiesUndistributedForeignEarnings

us-gaap:DefinedBenefitPlanAccumulatedBenefitObligation
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncrease
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanBenefitObligation
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo
us-gaap:DefinedBenefitPlanByPlanAssetCategories, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanFairValueOfPlanAssets
us-gaap:DefinedBenefitPlanByPlanAssetCategories, us-gaap:RetirementPlanType
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:RetirementPlanType
us-gaap:RetirementPlanType
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanFundedStatusOfPlan
us-gaap:RetirementPlanName
us-gaap:DefinedBenefitPlanPensionPlanWithProjectedBenefitObligationInExcessOfPlanAssetsPlanAssets
us-gaap:RetirementPlanName
us-gaap:DefinedBenefitPlanPensionPlanWithProjectedBenefitObligationInExcessOfPlanAssetsProjectedBenefitObligation
us-gaap:RetirementPlanName
us-gaap:DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateAccumulatedBenefitObligation
us-gaap:RetirementPlanName
us-gaap:DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateFairValueOfPlanAssets
us-gaap:DefinedBenefitPlanByPlanAssetCategories, us-gaap:RetirementPlanName
us-gaap:DefinedBenefitPlanPlanAssetsTargetAllocationPercentage
us-gaap:BalanceSheetLocation, us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation
us-gaap:DerivativeFairValueOfDerivativeLiability
us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation
us-gaap:DerivativeFairValueOfDerivativeNet
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:HedgingDesignation
us-gaap:DerivativeLiabilities
us-gaap:HedgingDesignation

us-gaap:DerivativeLiabilitiesCurrent

us-gaap:EmployeeRelatedLiabilitiesCurrent

us-gaap:FairValueNetAssetLiability
us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:FiniteLivedIntangibleAssetsAccumulatedAmortization
us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearFive

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearFour

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearThree

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo
us-gaap:FiniteLivedIntangibleAssetsByMajorClass
us-gaap:FiniteLivedIntangibleAssetsGross

us-gaap:IntangibleAssetsGrossExcludingGoodwill

us-gaap:InterestPayableCurrent

us-gaap:InventoryFinishedGoodsNetOfReserves

us-gaap:InventoryPartsAndComponentsNetOfReserves

us-gaap:InventoryWorkInProcessNetOfReserves
us-gaap:ConsolidatedEntities
us-gaap:InvestmentsInAndAdvancesToAffiliatesAtFairValue

us-gaap:LesseeOperatingLeaseDiscountRate

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths

us-gaap:LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear
us-gaap:CreditFacility, us-gaap:DebtInstrument
us-gaap:LineOfCreditFacilityMaximumBorrowingCapacity
us-gaap:DebtInstrument
us-gaap:CreditFacility, us-gaap:DebtInstrument
us-gaap:LineOfCreditFacilityRemainingBorrowingCapacity
us-gaap:DebtInstrument

us-gaap:LongTermDebtFairValue

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo

us-gaap:OtherInventoryNetOfReserves

us-gaap:OtherSundryLiabilitiesCurrent

us-gaap:ProductWarrantyAccrual

us-gaap:ProductWarrantyAccrualClassifiedCurrent

us-gaap:ProductWarrantyAccrualNoncurrent
us-gaap:ShareRepurchaseProgram
us-gaap:StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1

Plots across concepts


IncomeStatement
Other Comprehensive Income Loss Net Of Tax
Expenses
Other Nonoperating Income Expense
Balance Sheet
Operating Lease Liability
Assets
Operating Lease Right Of Use Asset
Current Assets
Other Assets Current
NonCurrent Assets
Operating Lease Right Of Use Asset
PropertyPlantAndEquipmentNet
Property Plant And Equipment Net
Liabilities
Operating Lease Liability
Current Liabilities
Operating Lease Liability Current
Noncurrent Liabilities
Operating Lease Liability Noncurrent
Stockholders Equity
Retained Earnings Accumulated Deficit
CashFlow
Net Cash Provided By Used In Financing Activities
NetCashProvidedByUsedInOperatingActivities
Share Based Compensation
NetCashProvidedByUsedInInvestingActivities
Net Cash Provided By Used In Investing Activities
NetCashProvidedByUsedInFinancingActivities
Net Cash Provided By Used In Financing Activities
Shares
Weighted Average Number Of Diluted Shares Outstanding
DividendsAndRepurchase
Dividends Common Stock Cash
OperatingLeaseLiability
Operating Lease Liability Current
LesseeOperatingLeaseLiabilityPaymentsDue
Lessee Operating Lease Liability Payments Due Year Four
InventoryNet
Inventory Work In Process Net Of Reserves
AccountsReceivable
Allowance For Doubtful Accounts Receivable Current

Tables

  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
 us-gaap:CommonStockValue us-gaap:StatementClassOfStock alsn:VotingCommonStock▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁█▅▆▆▆▆▇▇▇▇1.01.01.01.01.01.01.01.01.01.01.01.01.01.01.01.01.02.01.61.71.71.71.71.81.81.81.8NANANANANANANANANANANANANANANA
us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding ▁█109.0112.0NA114.0114.0116.0NA121.0124.0127.0NA131.0135.0140.0NA147.0152.0158.8NA167.9170.0171.5NA175.0179.6182.4NA180.9181.6185.9NA188.0189.9187.8NA185.5186.4186.2NA181.4181.4NA
us-gaap:WeightedAverageNumberOfSharesOutstandingBasic ▁█109.0111.0NA113.0113.0116.0NA120.0123.0126.0NA130.0134.0139.0NA146.0151.0157.9NA166.9169.0170.5NA174.0178.5180.0NA178.8178.8182.2NA184.4185.9184.7NA181.9181.4181.4NA181.4181.4NA
us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount ▄▄1.01.0NA1.01.00.0NA0.00.00.0NA0.00.00.0NA0.20.20.2NA0.60.60.6NA0.70.20.2NANANANANANA0.4NANANANANANANANANA
us-gaap:EarningsPerShareBasic ▄▄▃▃▂▅▄▅▆▅▅▅▅▄▆▃▃▃▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▁▂█▂▂▂▁▂1.011.080.540.680.21.20.91.241.471.331.151.281.31.091.520.750.630.530.370.270.360.280.080.270.30.380.280.380.320.290.240.240.270.150.060.182.280.320.250.21-0.090.2
us-gaap:EarningsPerShareDiluted ▄▅▃▃▂▅▄▅▆▅▅▅▅▅▆▄▃▃▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▁▂█▂▂▂▁▂1.011.070.530.680.21.20.91.231.461.321.141.271.291.081.510.750.630.520.360.270.360.280.080.270.30.380.280.380.310.280.230.240.260.150.060.172.210.310.240.21-0.090.2
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
 TTM Greenblatt ROC _ _▅▆▄▄▂▇▅▇██▆██▇▄▆▅▅▃▃▄▃▁▃▄▄▄▄▄▃▃▃▄▂▂▃▄▅▃167.0180.0133.0128.058.0215.0165.0224.0259.0244.0207.0246.0248.0222.0128.0198.0177.0149.0109.7104.0127.1110.737.2111.9137.5142.3117.8147.3132.2114.899.6111.2117.781.454.191.8119.6154.786.5NANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
us-gaap:ComprehensiveIncomeNetOfTax ▃▃▂▃▂▃▃▄▄▄▄▄▄▄▅▃▃▃▂▂▂▂▁▂▂▂▂▂▂▂▂▂▂▂▂▂█▂▁▂▁▂113.0123.053.080.019.0110.0115.0136.0167.0164.0143.0168.0158.0155.0252.0116.098.086.054.745.559.750.97.643.655.356.538.360.657.054.272.447.044.024.919.338.6404.664.810.628.2-13.746.9
us-gaap:CostOfRevenue ▆▅▅▄▁▆▇▇█▆▆▇▇▇▆▅▅▃▃▂▃▃▃▃▄▄315.0297.0282.0278.0212.0311.0319.0321.0348.0316.0309.0324.0337.0321.0300.0293.0290.0248.0251.2229.6248.2247.0256.0256.9274.7264.4NANANANANANANANANANANANANANANANA
us-gaap:GrossProfit ▅▅▄▄▁▆▅▇█▇▆▇█▇▅▅▅▄▃▂▃▃▃▃▃▃▄▄▃▃▂▂▃▂▂▃▄▅▃▄▃▃288.0291.0253.0254.0165.0326.0298.0348.0389.0359.0338.0368.0374.0342.0288.0302.0290.0251.0217.7204.7226.7215.1222.2236.1236.3239.2255.6259.3238.5222.5211.4206.1226.1198.3194.2224.4251.9283.8222.4257.6244.5230.0
us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest ▅▆▄▄▂▇▅▇█▇▆██▇▄▆▆▅▄▃▄▄▂▃▄▄▄▅▄▄▃▃▄▃▂▃▃▄▃▃▁▃140.0154.084.098.030.0181.0134.0194.0229.0211.0174.0218.0222.0191.084.0170.0146.0127.094.771.099.176.519.773.887.1108.277.8116.394.779.367.572.481.844.421.149.262.783.249.857.1-11.254.9
us-gaap:IncomeTaxExpenseBenefit ██▇▇▇█▇███▇███▅████▇█▇▇▇██▇██▇▇▇█▇▇▇▁▇▇▇▇▇30.034.024.021.07.042.027.045.048.044.027.051.048.040.0-131.059.051.044.033.526.438.328.26.727.332.739.827.347.537.527.224.627.931.316.99.917.0-350.125.25.318.36.018.0
us-gaap:IncomeTaxesPaidNet ▇▁▃▂▁▂▂▅█▂▄▆▇▁▅▅44.01.013.05.02.06.05.029.049.06.021.034.045.01.031.031.0NANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:InterestIncomeExpenseNet ▅▆▁▃▃▃▃▄▃▂▄▅▅▅█▇-30.0-29.0-37.0-34.0-33.0-33.0-33.0-32.0-33.0-36.0-31.0-30.0-30.0-30.0-25.0-26.0NANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:InterestIncomeExpenseNet us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome,us-gaap:StatementEquityComponents us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome,us-gaap:AccumulatedGainLossNetCashFlowHedgeParent-3.0NANANA-2.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:InterestPaidNet ▄▁█▁▇▁█▁▅▂▆▂▆▁▇▂31.07.063.08.057.08.062.010.039.014.047.011.047.010.053.016.0NANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:NetIncomeLoss ▃▃▂▃▂▄▃▄▄▄▄▄▄▄▅▃▃▃▂▂▂▂▁▂▂▂▂▂▂▂▂▂▂▂▁▂█▂▂▂▁▂110.0120.060.077.023.0139.0107.0149.0181.0167.0147.0167.0174.0151.0215.0111.095.083.061.244.660.848.313.046.554.468.450.568.857.252.142.944.550.527.511.232.2412.858.044.538.8-17.236.9
us-gaap:OperatingIncomeLoss ▅▆▄▄▂▇▅▇██▆██▇▄▆▅▅▃▃▄▃▁▃▄▄▄▄▄▃▃▃▄▂▂▃▄▅▃▄▄▃167.0180.0133.0128.058.0215.0165.0224.0259.0244.0207.0246.0248.0222.0128.0198.0177.0149.0109.7104.0127.1110.737.2111.9137.5142.3117.8147.3132.2114.899.6111.2117.781.454.191.8119.6154.786.5124.1119.698.8
us-gaap:OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax █▁4.0-6.0NA2.00.0-2.02.0-6.01.0NA-4.0NANANANANANANANANANANANANANANANANANANANANANANA0.71.6-3.7NA-6.6-2.7-1.0NA
us-gaap:OtherComprehensiveIncomeLossNetOfTax ▄▄▃▄▄▁▅▃▃▄▄▄▂▄█▅▄▄▃▄▄▄▄▄▄▃▃▃▄▄▇▄▃▄3.03.0-7.03.0-4.0-29.08.0-13.0-14.0-3.0-4.01.0-16.04.037.05.03.03.0-6.50.9-1.12.6-5.4-2.90.9-11.9-12.2-8.2-0.22.129.52.5-6.5-2.6NANANANANANANANA
us-gaap:OtherNonoperatingIncomeExpense ▄▄▃▄▄▃▄▄▄▄▃▄▄▃▂▃▃▄▄▄▃▄▄▃▃▄▃▃▃▄▄▄▄▄█▃▂▁▄▃▃▄3.03.0-12.04.05.0-1.02.02.03.03.0-2.02.04.0-1.0-19.0-2.0-4.03.01.90.8-0.2-0.13.3-4.2-2.22.8-5.4-0.4-0.90.20.20.00.00.155.0-1.8-22.8-30.81.0-3.7-2.95.7
us-gaap:ResearchAndDevelopmentExpense ▆▆▆▄▆▅█▆▅▄▅▄▄▃▄▂▂▂▂▁▁▁▂▂▂▁▄▂▁▂▂▁▂▃▃▅▂▃▂▄▃▄41.038.040.033.038.036.047.039.037.031.037.033.033.028.031.026.025.023.024.520.721.821.823.523.623.222.233.624.521.224.524.420.922.829.028.135.923.227.926.031.928.230.3
us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax ▅▅▄▄▁▆▆▇█▇▆▇▇▇▅▅▅▃▃▂▃▃▃▃▄▃▄▄▄▃▃▃▄▃▃▃▅▅▄▅▄▄603.0588.0535.0532.0377.0637.0617.0669.0737.0675.0647.0692.0711.0663.0588.0595.0580.0499.0468.9434.3474.9462.1478.2493.0511.0503.6544.4553.3536.1493.6491.0466.3512.1457.4487.0493.5559.4601.9516.1574.0555.7517.0
us-gaap:SellingGeneralAndAdministrativeExpense ▃▂▃▅▁▂▅▄▅▃▄▄▅▅▆▂▄▃▃▃▂▃▃▄▂▂▄▄▄▃▄▂▄▄█▆█▆█▆▆▆80.073.080.093.069.075.092.085.093.084.090.089.093.092.097.078.088.079.083.580.077.882.681.586.675.673.488.887.585.183.287.474.085.687.9112.096.7109.1101.2110.0101.696.7100.9
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
us-gaap:Assets ▄▄▃▃▄▃▃▃▂▃▂▂▁▂▁▂▁▁▂▂▃▃▃▄▅▅▅▆▅▆▅▅▆▆▆▇▇▇█4522.04534.04477.04446.04633.04424.04450.04471.04355.04392.04237.04285.04171.04260.04205.04261.04142.04179.04218.64239.34463.14441.24408.44566.74683.04789.54804.24824.24771.94819.94812.64811.24937.84903.94866.04990.65064.05108.15192.6NANANA
us-gaap:Liabilities ▅▅▄▄▆▄▄▄▄▄▄▄▄▃▃▄▃▃▁▁▂▂▂▂▂▂▃▃▃▃▂▃▃▃▃▄▅▇█3790.03770.03721.03700.03938.03731.03669.03728.03687.03646.03578.03601.03569.03554.03516.03706.03446.03442.03138.33122.63300.43258.43219.83352.23317.43370.53406.43470.73477.93426.13373.83443.43508.83509.13509.13666.43780.24219.84370.9NANANA
us-gaap:LiabilitiesAndStockholdersEquity ▄▄▃▃▄▃▃▃▂▃▂▂▁▂▁▂▁▁▂▂▃▃▃▄▅▅▅▆▅▆▅▅▆▆▆▇▇▇█4522.04534.04477.04446.04633.04424.04450.04471.04355.04392.04237.04285.04171.04260.04205.04261.04142.04179.04218.64239.34463.14441.24408.44566.74683.04789.54804.24824.24771.94819.94812.64811.24937.84903.94866.04990.65064.05108.15192.6NANANA
us-gaap:StockholdersEquity ▂▃▃▃▂▂▃▂▂▃▂▂▁▂▂▁▂▂▅▅▆▆▆▆▇██▇▇██▇██▇▇▇▄▃732.0764.0756.0746.0695.0693.0781.0743.0668.0746.0659.0684.0602.0706.0689.0555.0696.0737.01080.31116.71162.71182.81188.61214.51365.61419.01397.81353.51294.01393.81438.81367.81429.01394.81356.91324.21283.8888.3821.7NANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
us-gaap:AssetsCurrent ▆▇▆▅█▄▄▆▅█▅▆▄▅▄▄▂▂▂▂▅▅▃▄▅▆▆▅▄▄▃▃▄▃▁▂▃▄▅798.0820.0756.0710.0887.0666.0686.0748.0705.0881.0725.0764.0633.0716.0632.0665.0527.0537.0547.6549.9744.1690.3616.8641.8725.5795.3758.0742.9647.5652.6606.9607.0686.6578.7490.3527.5577.8648.8702.7NANANA
us-gaap:CashAndCashEquivalentsAtCarryingValue ▄▅▆▄█▂▃▂▂▆▄▄▁▃▃▄▁▂▃▃▇▅▄▂▄▅▅▄▂▃▃▂▄▂▁▁▂▃▆▆▅▆238.0295.0310.0251.0434.0114.0192.0152.0153.0324.0231.0221.096.0195.0199.0210.085.0120.0204.7164.7364.4299.1251.6148.4216.8265.1263.0208.1126.7159.9184.7152.3227.4120.980.281.9112.1192.9314.0353.8271.8352.4
us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents ▄▅▆▄█▂▃▂▂▆▄▄▁▃▃▄▁238.0295.0310.0251.0434.0114.0192.0152.0153.0324.0231.0221.096.0195.0199.0210.085.0NA205.0NANANA252.0NANANANANANANANANANANANANANANANANANANA
us-gaap:AccountsReceivableNetCurrent ▇▆▄▄▃▇▅█▇█▆██▇▃▅▅▄▂▃▂▃▂▃▄▄▃▄▄▄▁▂▃▃▁▃▄▄▂299.0292.0228.0245.0212.0303.0253.0329.0322.0332.0279.0335.0328.0312.0221.0271.0274.0250.0196.9202.8200.0219.0195.0223.9228.1231.3207.4240.0227.0227.2175.1198.7208.5204.0165.0204.0234.8240.4194.7NANANA
us-gaap:InventoryNet █▇▆▅▇█▇█▆▆▅▄▅▅▃▄▃▃▁▄▃▂▂▃▃▄▃▄▅▅▄▄▄▅▄▆▅▅▄206.0193.0181.0177.0201.0207.0199.0209.0188.0189.0170.0166.0170.0172.0154.0156.0147.0144.0125.6155.8150.4142.7141.4155.3155.3160.9143.5161.5169.5175.6160.4165.9162.9168.2157.1187.0168.3171.5155.9NANANA
us-gaap:OtherAssetsCurrent ▇▅▄▄▅▅▅█▅▄▃▂▂▂▂▂▁▁▁▂▃▃▃▂▂▂▂▃▃▃▃▃▃▃▃▄▃▅▄55.040.037.037.040.042.042.058.042.036.029.024.024.027.025.028.021.023.020.426.629.329.528.826.027.525.024.429.529.431.828.633.231.128.932.735.631.744.038.1NANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
us-gaap:PropertyPlantAndEquipmentGross NANA1684.0NANANA1595.0NANANA1399.0NANANA1298.0NANANA1248.7NANANA1214.6NANANA1181.9NANANA1164.3NANANA1111.7NANANA1015.6NANANA
 us-gaap:PropertyPlantAndEquipmentGross us-gaap:PropertyPlantAndEquipmentByType us-gaap:BuildingAndBuildingImprovementsNANA423.0NANANA342.0NANANA336.0NANANA322.0NANANA303.4NANANA293.8NANANANANANANANANANANANANANANANANANANA
 us-gaap:PropertyPlantAndEquipmentGross us-gaap:PropertyPlantAndEquipmentByType us-gaap:LandImprovementsNANA26.0NANANA25.0NANANA24.0NANANA24.0NANANA25.4NANANA25.0NANANANANANANANANANANANANANANANANANANA
 us-gaap:PropertyPlantAndEquipmentGross us-gaap:PropertyPlantAndEquipmentByType us-gaap:MachineryAndEquipmentNANA783.0NANANA722.0NANANA643.0NANANA601.0NANANA589.6NANANA585.7NANANANANANANANANANANANANANANANANANANA
 us-gaap:PropertyPlantAndEquipmentGross us-gaap:PropertyPlantAndEquipmentByType us-gaap:SoftwareAndSoftwareDevelopmentCostsNANA175.0NANANA163.0NANANA143.0NANANA136.0NANANA127.6NANANA121.3NANANANANANANANANANANANANANANANANANANA
 us-gaap:PropertyPlantAndEquipmentGross us-gaap:PropertyPlantAndEquipmentByType us-gaap:ToolsDiesAndMoldsNANA223.0NANANA202.0NANANA201.0NANANA169.0NANANA157.1NANANA160.0NANANANANANANANANANANANANANANANANANANA
us-gaap:ConstructionInProgressGross NANA54.0NANANA141.0NANANA52.0NANANA46.0NANANA45.6NANANA28.8NANANA39.9NANANA48.6NANANA56.0NANANA72.3NANANA
us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment NANA1046.0NANANA979.0NANANA933.0NANANA850.0NANANA784.6NANANA734.9NANANA667.3NANANA600.9NANANA515.5NANANA433.8NANANA
us-gaap:AmortizationOfIntangibleAssets ▁▁▁▁▂▂▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▅▅▅▅▅▅▅▆████████11.012.012.011.013.016.021.022.021.022.021.022.022.022.023.022.023.022.023.023.023.023.424.224.324.324.324.724.724.724.725.225.125.129.937.537.537.537.537.938.038.038.0
us-gaap:PropertyPlantAndEquipmentNet █▇▇▇▇▇▆▅▃▂▂▁▁▁▁▁▁▂▂▁▂▂▂▂▂▃▃▄▄▄▅▅▅▆▆▆▅▆▅665.0644.0638.0636.0634.0627.0616.0561.0490.0473.0466.0448.0442.0440.0448.0456.0453.0457.0464.1454.6460.1466.3479.7479.1485.4495.6514.6526.7538.2551.1563.4553.1563.3585.2596.2592.6581.3591.7581.8NANANA
us-gaap:Goodwill █████▇▇▇▅▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁2064.02064.02064.02063.02062.02041.02041.02040.02019.01941.01941.01941.01941.01941.01941.01941.01941.01941.01941.01941.01941.01941.01941.01941.01941.01941.01941.01941.01941.01941.01941.01941.01941.01941.01941.01941.01941.01941.01941.0NANANA
 us-gaap:IndefiniteLivedIntangibleAssetsExcludingGoodwill us-gaap:IndefiniteLivedIntangibleAssetsByMajorClass alsn:IndefiniteLivedInProcessResearchAndDevelopment▁▁▁▁▁███25.025.025.025.025.050.050.050.0NANA0.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:IndefiniteLivedIntangibleAssetsExcludingGoodwill us-gaap:IndefiniteLivedIntangibleAssetsByMajorClass us-gaap:TradeNames████████▁791.0791.0791.0791.0791.0791.0791.0791.0790.0NA790.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:IntangibleAssetsNetExcludingGoodwill ▁▁▁▁▁▂▂▂▂▂▂▂▂▂▃▃▃▃▃▃▄▄▄▅▅▅▅▆▆▆▆▆▆▇▇▇▇██940.0951.0963.0975.0986.01026.01042.01061.01079.01044.01066.01087.01109.01131.01153.01175.01197.01220.01242.41265.51288.51311.51334.81439.11463.41487.71512.01536.71561.41586.11610.81636.01661.11686.21716.11753.61791.11828.61866.1NANANA
 us-gaap:FiniteLivedIntangibleAssetsNet us-gaap:FiniteLivedIntangibleAssetsByMajorClass alsn:CustomerRelationshipsCommercial▁▁▁▂▂▂▂▂▂▃▃▃▃▃▄▄▄▄▄▅▅▅▅▅▆▆▆▆▇▇▇▇███110.0120.0131.0142.0153.0164.0175.0186.0194.0202.0213.0224.0235.0247.0259.0270.0282.0294.0305.7317.9330.1342.3354.5367.1379.7392.3404.9418.0430.9443.9456.9470.3483.7497.1510.6NANANANANANANA
 us-gaap:FiniteLivedIntangibleAssetsNet us-gaap:FiniteLivedIntangibleAssetsByMajorClass alsn:CustomerRelationshipsDefense▁▁▁▁▂▂▂▂▃▃▃▃▃▄▄▄▄▄▅▅▅▅▅▆▆▆▆▆▇▇▇▇███13.014.015.015.016.017.018.018.020.020.021.022.023.024.024.025.026.027.027.628.529.330.231.031.932.733.634.435.336.237.137.938.939.740.641.5NANANANANANANA
 us-gaap:FiniteLivedIntangibleAssetsNet us-gaap:FiniteLivedIntangibleAssetsByMajorClass alsn:ProprietaryTechnology▁▁▁▁▁▁▁▁▂▂▂▂▃▃▃▃▄▄▄▄▅▅▅▅▆▆▆▆▇▇▇▇███1.01.01.02.01.04.08.016.025.032.042.051.061.070.080.090.099.0108.0118.1127.6137.2146.7156.2165.6175.3184.8194.3203.8213.4222.9232.4242.0251.5261.0270.5NANANANANANANA
us-gaap:IntangibleAssetsNetIncludingGoodwill ▁▁▁▁▂▂▂▂▂▁▁▁▂▂▂▂▂▃▃▃▃▄▄▅▅▅▅▆▆▆▆▇▇▇▇██3004.03015.03027.03038.03048.03067.03083.03101.03098.02985.03007.03028.03050.03072.03094.03116.03138.03161.03183.03206.53229.53252.53275.83380.13404.43428.73453.03477.73502.43527.13551.83577.03602.13627.23657.13694.63732.1NA3807.1NANANA
us-gaap:OperatingLeaseRightOfUseAsset ▅▅▆▇▇▇█▆▇▁20.020.021.022.022.023.024.021.022.013.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:OtherAssetsNoncurrent ▄▄▄▄▅▅▅▄▄▄▂▃▃▂▂▁▁▁▁▁▂▂▂▅▅▅▆▆▆▇▇▅▇▇▇▇▇██55.055.056.062.064.064.065.061.062.053.039.045.046.032.031.024.024.024.023.528.329.432.134.264.466.468.677.375.982.788.089.473.084.791.690.193.784.498.0101.0NANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
us-gaap:AccountsPayableCurrent ▄▄▃▂▂▆▃▆██▄▇█▇▄▆▅▄▁▂▂▂▁▂▂▃▃▆▅▅▃▄▄▄▂▅▆█▄167.0167.0157.0133.0138.0191.0150.0185.0208.0209.0169.0198.0210.0203.0159.0184.0172.0158.0127.9134.6138.6134.1126.2140.9142.4157.1151.7182.9174.4173.3150.4163.9168.4161.4133.1176.2186.2213.0162.6NANANA
us-gaap:ContractWithCustomerLiabilityCurrent ▆▃▂▁▂▂▃▃▂▂▂▃▅▇█▁39.035.034.033.034.034.035.035.034.034.034.035.038.040.041.033.0NANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LiabilitiesCurrent ▆▆▄▄▃▆▆███▆▇▇▆▆▇▅▄▃▂▂▂▁▁▂▂▃▄▄▅▄▅▅▅▄▅▅▇▇429.0418.0373.0382.0356.0426.0417.0477.0468.0465.0426.0448.0442.0436.0417.0444.0397.0378.0342.2335.7340.8319.5304.6316.0321.8334.2345.9386.8378.3411.1387.2398.3414.0396.8377.8412.9409.6451.0449.9NANANA
us-gaap:LongTermDebtCurrent ▂▂▂▂▂▂▂▂▂▂▁▁▁▄▄▄▄▄▄▄▇▇▇▆▆▅▅▅▅▅▅▄▆▆▅▅▃▃█6.06.06.06.06.06.06.06.06.05.00.00.00.012.012.012.012.012.011.911.924.524.524.522.622.617.917.917.917.919.517.911.423.523.519.516.58.08.031.0NANANA
us-gaap:OperatingLeaseLiabilityCurrent ▇▇▇▇███▇▇▅▁4.04.04.04.05.05.05.04.04.03.00.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:OtherLiabilitiesCurrent ▆▅▃▅▄▅▇█▆▆▆▆▅▄▆▆▄▄▄▃▂▁▁▁▂▂▃▃▃▃▄▄▄▄▅▅▄▅▆188.0178.0140.0176.0149.0170.0202.0226.0193.0190.0197.0189.0166.0157.0183.0193.0164.0158.0150.2136.9125.3110.3106.1105.0113.9114.7131.7141.6140.8147.3152.3162.8165.0154.5167.4166.3161.3178.2199.9NANANA
us-gaap:TaxesPayableCurrent ▂▇▂▇▂▂▃▂▂▆▂▁▃▃▂▅▅█▂▄▄▄▃▃▂▂▂▃▁▁▂▂▁▁▁▁▂11.026.011.024.011.011.012.011.010.023.010.08.014.013.010.019.019.028.09.916.117.415.012.611.510.110.48.512.37.37.08.69.28.38.36.97.59.6NA17.1NANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
us-gaap:LongTermDebt ▁▁▁▁█▁▁▁2535.02536.02538.02540.02816.02543.02544.02546.0NA2548.02548.02548.02548.02573.02576.02579.02387.02430.02187.62190.6NANA2402.82409.02414.62468.82520.52589.92669.42675.52660.42719.82785.52791.42801.32899.13012.63166.03345.0NANANA
us-gaap:LongTermDebtNoncurrent ▄▄▄▄▆▄▄▄▄▄▄▄▄▄▄▄▃▃▁▁▃▃▃▃▃▃▄▄▅▅▅▆▆▆▆▇█2505.02506.02507.02510.02786.02512.02512.02513.02514.02514.02523.02522.02520.02532.02534.02536.02348.02390.02146.82148.82343.92348.32352.72386.42392.02450.92502.62572.02651.52656.02660.42719.82785.52791.42801.32899.13012.6NA3345.0NANANA
us-gaap:DeferredIncomeTaxLiabilitiesNet █▇▇▆▆▅▄▄▃▂▁▁473.0459.0442.0424.0421.0415.0387.0380.0355.0339.0329.0322.0NANA276.0NANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent us-gaap:RetirementPlanType us-gaap:OtherPostretirementBenefitPlansDefinedBenefitNANA104.0NANANA91.0NANANA90.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent us-gaap:RetirementPlanType us-gaap:PensionPlansDefinedBenefitNANA7.0NANANA0.0NANANA0.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:OtherLiabilitiesNoncurrent ▇▇█▇▇▇▅▆▅▄▂▃▃▃▃▆▆▆▆███▇▇▆▆▅▃▂▁▁▄▃▅▅▇▇▇▇249.0250.0260.0246.0245.0246.0221.0226.0219.0194.0172.0179.0182.0187.0181.0231.0235.0234.0233.3253.2255.8257.6248.1251.7225.1224.3211.4189.7171.7158.8153.7193.5188.9208.6213.8238.0237.4244.7239.5NANANA
us-gaap:OperatingLeaseLiabilityNoncurrent ▆▆▇▇▇▇█▆▇▁15.016.017.017.017.017.018.016.017.09.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo ▁▁██3.03.04.04.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree ▁▁██2.02.03.03.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive NANA1.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive NANA8.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
us-gaap:StockholdersEquity ▂▃▃▃▂▂▃▂▂▃▂▂▁▂▂▁▂▂▅▅▆▆▆▆▇██▇▇██▇██▇▇▇▄▃732.0764.0756.0746.0695.0693.0781.0743.0668.0746.0659.0684.0602.0706.0689.0555.0696.0737.01080.31116.71162.71182.81188.61214.51365.61419.01397.81353.51294.01393.81438.81367.81429.01394.81356.91324.21283.8888.3821.7NANANA
 us-gaap:CommonStockValue us-gaap:StatementClassOfStock alsn:VotingCommonStock▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁█▅▆▆▆▆▇▇▇▇1.01.01.01.01.01.01.01.01.01.01.01.01.01.01.01.01.02.01.61.71.71.71.71.81.81.81.8NANANANANANANANANANANANANANANA
us-gaap:AdditionalPaidInCapitalCommonStock ███▇▇▇▇▇▇▆▆▆▆▅▅▅▅▄▄▃▃▃▃▂▂▂▁1826.01820.01818.01812.01806.01804.01802.01799.01796.01788.01788.01784.01764.01762.01758.01750.01745.01736.01728.01707.11696.91692.51690.21688.51685.01681.51651.0NANANANANANANANANANANANANANANA
us-gaap:RetainedEarningsAccumulatedDeficit ▂▂▂▂▂▂▂▂▁▂▁▁▁▂▁▁▂▂▄▄▄▅▅▅▅▆▆▆▅▆▆▆▆▆▆▆█▄▃-1012.0-971.0-974.0-985.0-1027.0-1031.0-970.0-997.0-1082.0-1010.0-1100.0-1075.0-1136.0-1046.0-1055.0-1144.0-993.0-941.0-586.4-535.7-478.6-455.2-444.5-422.4-270.7-212.9-215.5-239.1-286.7-214.6-173.8-194.9-157.7-185.9-202.3-202.5223.8-625.7-683.7NANANA
 us-gaap:RetainedEarningsAccumulatedDeficit us-gaap:ConsolidatedEntities srt:ParentCompanyNANA-974.0NANANA-970.0NANANA-1100.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax ▁▁▁▁▁▁▃▂▃▄▄▄▄▅▅▃▃▂▂▃▃▃▂▃▃▃▃▄▄▄▄▃▃▃▃▃█▃▃-83.0-86.0-89.0-82.0-85.0-81.0-52.0-60.0-47.0-33.0-30.0-26.0-27.0-11.0-15.0-52.0-57.0-60.0-62.9-56.4-57.3-56.2-58.8-53.4-50.5-51.4-39.5-27.3-19.1-18.9-21.0-50.5-53.0-46.5-43.9-51.958.3-50.1-57.0NANANA
 us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax us-gaap:ConsolidatedEntities srt:ParentCompanyNANA-89.0NANANA-52.0NANANA-30.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:StockIssuedDuringPeriodValueNewIssues ▃▂▂▂▂▂▂▃▄▁▂█1.0-1.00.00.00.0-1.00.01.04.0-4.00.017.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue ▆▃██▁▃▃▁▆▃▄▃5.03.06.06.02.03.03.02.05.03.04.03.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
us-gaap:NetCashProvidedByUsedInOperatingActivities ▃▃▄▄▁▄▆▇█▆██▇▄▅▇143.0128.0163.0158.092.0148.0202.0212.0239.0194.0232.0239.0213.0153.0166.0215.0NANANANANANANANANANANANANA98.6138.1131.0129.754.7112.1138.9106.9139.671.9203.683.8109.9
us-gaap:NetCashProvidedByUsedInInvestingActivities ▆▇▇▇▇▇▅▂▁█▆▇██▆█-48.0-21.0-35.0-31.0-24.0-21.0-82.0-146.0-158.0-19.0-51.0-23.0-19.0-10.0-51.0-20.0NANANANANANANANANANANANANA-15.1-35.7-15.2-11.5-19.1-30.2-38.5-34.6-35.4-40.4-30.020.3-5.8
us-gaap:NetCashProvidedByUsedInFinancingActivities ▃▃▄▁█▂▄▄▂▄▃▄▁▃▃▄-153.0-121.0-72.0-312.0252.0-203.0-81.0-65.0-251.0-83.0-171.0-90.0-290.0-149.0-127.0-71.0NANANANANANANANANANANANANA-105.7-69.8-190.0-19.82.1-85.2-120.2-170.3-217.8-80.6-103.1NANA
us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect ▃▃▄▁█▂▄▄▁▅▄-57.0-15.059.0-183.0320.0-78.040.0-1.0-171.093.010.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
us-gaap:AmortizationOfFinancingCosts ▁▂▂▂▂▂▂▃▂▂▂▃▂▃▃▂▃▂▂▂▃▃▃▃▃▃▃▃▃▃▄▅▃▄▄█▃▄▄▄▅▄0.01.01.01.01.01.01.02.01.01.01.02.01.02.02.01.02.01.01.41.42.02.02.31.91.91.91.91.92.32.02.53.71.82.93.26.72.22.42.72.83.72.9
us-gaap:DeferredIncomeTaxExpenseBenefit ▇▇█▇▇█▇██▇▇█▇▇▅███████▇███████████▇█▁█▇▇▇▇15.014.023.03.08.035.04.028.020.013.06.021.013.012.0-122.028.019.025.033.926.331.222.84.524.232.934.426.643.534.227.520.228.832.916.18.019.0-351.821.05.913.84.915.2
us-gaap:IncreaseDecreaseInAccountsPayable NANA30.0-1.0-54.021.0-27.0-21.0-11.034.0-20.0-17.02.044.0-26.013.013.030.0-6.1-4.14.47.7-14.6-1.4-14.85.7-30.99.01.122.9-13.4-4.67.028.6-43.0-10.3-26.350.2-45.619.716.933.9
us-gaap:IncreaseDecreaseInAccountsReceivable ▅▇▄▆▁▆▂▄▄▇▂▅▅█▂▄▅▇▄▅▄▅▃▄▄▆▃▅▄▇▄▄▅▆▃▃▄▆▃▄▅▆7.066.0-20.031.0-90.051.0-77.0-4.0-10.054.0-56.07.020.090.0-52.0-3.022.052.0-2.22.3-19.523.1-28.3-3.9-3.626.8-31.615.40.052.0-23.7-10.63.940.3-40.2-31.7-2.944.9-27.3-13.322.643.0
us-gaap:IncreaseDecreaseInInventories ▇▇▅▂▄▆▄▆▅█▆▅▅▇▅▆▆▇▁▆▆▅▃▅▄█▃▄▄▇▄▅▅▇▁█▅▇▄▅▇▇12.014.01.0-25.0-6.09.0-9.04.0-2.018.03.0-2.01.016.0-3.09.03.016.0-27.04.66.90.1-13.81.8-5.920.1-16.4-5.1-6.114.9-5.62.2-4.412.2-29.817.4-0.714.9-7.7-4.112.010.8
us-gaap:IncreaseDecreaseInOtherOperatingCapitalNet ▅▂▇▁▆▇▆▄▆▄▅▃▅▄▇▂▄▄▂▃▄▄▃▃▅▇▆▃▅▃▃▄▅▆▄▃▅▅▇▂█▃9.0-34.032.0-42.021.032.020.0-12.012.0-4.03.0-24.02.0-3.029.0-25.0-11.0-4.0-24.6-14.6-8.9-3.0-16.5-20.34.730.619.9-13.23.9-18.9-16.1-3.66.816.1-9.9-13.110.64.527.8-26.340.0-17.8
us-gaap:NetCashProvidedByUsedInOperatingActivities ▃▃▄▄▁▄▆▇█▆██▇▄▅▇143.0128.0163.0158.092.0148.0202.0212.0239.0194.0232.0239.0213.0153.0166.0215.0NANANANANANANANANANANANANA98.6138.1131.0129.754.7112.1138.9106.9139.671.9203.683.8109.9
us-gaap:NetIncomeLoss ▃▃▂▃▂▄▃▄▄▄▄▄▄▄▅▃▃▃▂▂▂▂▁▂▂▂▂▂▂▂▂▂▂▂▁▂█▂▂▂▁▂110.0120.060.077.023.0139.0107.0149.0181.0167.0147.0167.0174.0151.0215.0111.095.083.061.244.660.848.313.046.554.468.450.568.857.252.142.944.550.527.511.232.2412.858.044.538.8-17.236.9
us-gaap:ShareBasedCompensation ▇▄██▂▄▄▂▇▄▅▄▄▄▅▂▅▂▄▃▃▃▃▃▃▃▅▅▅▄▄▄▆▄▂▁▂▂▂▃▃▂5.03.06.06.02.03.03.02.05.03.04.03.03.03.04.02.04.02.03.02.12.12.22.62.52.62.13.63.84.03.33.03.04.33.41.91.01.81.71.62.12.32.0
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
us-gaap:NetCashProvidedByUsedInInvestingActivities ▆▇▇▇▇▇▅▂▁█▆▇██▆█-48.0-21.0-35.0-31.0-24.0-21.0-82.0-146.0-158.0-19.0-51.0-23.0-19.0-10.0-51.0-20.0NANANANANANANANANANANANANA-15.1-35.7-15.2-11.5-19.1-30.2-38.5-34.6-35.4-40.4-30.020.3-5.8
us-gaap:PaymentsToAcquirePropertyPlantAndEquipment ▅▃▄▄▃▃█▅▃▃▅▃▃▂▅▃▂▂▄▂▂▁▃▂▂▁▃▂▂▂▄▂▂▂▄▄▃▄▅▃▂▂48.021.035.031.028.021.081.047.025.019.048.023.019.010.051.020.012.08.033.914.116.26.428.015.213.61.326.514.911.611.133.215.413.212.630.031.426.835.741.627.716.011.6
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
us-gaap:NetCashProvidedByUsedInFinancingActivities ▃▃▄▁█▂▄▄▂▄▃▄▁▃▃▄-153.0-121.0-72.0-312.0252.0-203.0-81.0-65.0-251.0-83.0-171.0-90.0-290.0-149.0-127.0-71.0NANANANANANANANANANANANANA-105.7-69.8-190.0-19.82.1-85.2-120.2-170.3-217.8-80.6-103.1NANA
us-gaap:PaymentsOfDividends ▅▅▅▅▅▅▄▄▄▅▅▅▅▅▅▆▆▆▇▇▇▇▇████▆▆▆▆▆▆▁▁▁21.021.020.019.019.020.018.018.018.019.019.020.020.021.021.022.023.023.024.724.925.325.725.626.126.927.026.921.321.721.721.921.822.311.111.010.9NANANANANANA
us-gaap:PaymentsForRepurchaseOfCommonStock ▃▃▁▁▁▄▂▂▅▂▄▂▅▃▃▅▃█▂▂▂▂▁▄▂▂▁▁▄▃▁130.096.029.016.00.0180.062.046.0235.050.0153.086.0245.0125.0107.0239.0124.0415.087.276.759.033.39.5181.679.335.40.00.0149.8100.00.0NANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31

Common Stock Value

us-gaap:CommonStockValue us-gaap:StatementClassOfStock

us-gaap:CommonStockValue

alsn:VotingCommonStock


Common
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-31
Value1000000.01000000.01000000.01000000.01000000.01000000.01000000.01000000.01000000.01000000.01000000.01000000.01000000.01000000.01000000.01000000.01000000.02000000.01600000.01700000.01700000.01700000.01700000.01800000.01800000.01800000.01800000.0
Percentage of CommonStockValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets alsn:VotingCommonStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Weighted Average Number Of Diluted Shares Outstanding

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding


Weighted
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-30
Value109112114114116121124127131135140147152158167170171175179182180181185188189187185186186181181
Percentage of WeightedAverageNumberOfDilutedSharesOutstanding100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Weighted Average Number Of Shares Outstanding Basic

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic


Weighted
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-30
Value109111113113116120123126130134139146151157166169170174178180178178182184185184181181181181181
Percentage of WeightedAverageNumberOfSharesOutstandingBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount

us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount

us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount


Antidilutive
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312013-06-30
Value1000000.01000000.01000000.01000000.00000000200000.0200000.0200000.0600000.0600000.0600000.0700000.0200000.0200000.0400000.0
Percentage of AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount100.0100.0100.0100.00.00.00.00.00.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Earnings Per Share Basic

us-gaap:EarningsPerShareBasic

us-gaap:EarningsPerShareBasic


Earnings
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value1.011.080.540.680.21.20.91.241.471.331.151.281.31.091.520.750.630.530.370.270.360.280.080.270.30.380.280.380.320.290.240.240.270.150.060.182.280.320.250.21-0.090.2
Percentage of EarningsPerShareBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Earnings Per Share Diluted

us-gaap:EarningsPerShareDiluted

us-gaap:EarningsPerShareDiluted


Earnings
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value1.011.070.530.680.21.20.91.231.461.321.141.271.291.081.510.750.630.520.360.270.360.280.080.270.30.380.280.380.310.280.230.240.260.150.060.172.210.310.240.21-0.090.2
Percentage of EarningsPerShareDiluted100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Comprehensive Income Net Of Tax

us-gaap:ComprehensiveIncomeNetOfTax

us-gaap:ComprehensiveIncomeNetOfTax


Comprehensive
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value1131235380191101151361671641431681581552521169886544559507.643555638605754724744241938404641028-13.746
Percentage of ComprehensiveIncomeNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax18.720.99.915.05.017.318.620.322.724.322.124.322.223.442.919.516.917.211.710.512.611.01.68.810.811.27.011.010.611.014.710.18.65.44.07.872.310.82.14.9-2.59.1

Cost Of Revenue

us-gaap:CostOfRevenue

us-gaap:CostOfRevenue


Cost
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value315297282278212311319321348316309324337321300293290248251229248247256256274264
Percentage of CostOfRevenue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax52.250.552.752.356.248.851.748.047.246.847.846.847.448.451.049.250.049.753.652.952.353.553.552.153.852.5

Gross Profit

us-gaap:GrossProfit

us-gaap:GrossProfit


Gross
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value288291253254165326298348389359338368374342288302290251217204226215222236236239255259238222211206226198194224251283222257244230
Percentage of GrossProfit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax47.849.547.347.743.851.248.352.052.853.252.253.252.651.649.050.850.050.346.447.147.746.546.547.946.247.547.046.944.545.143.144.244.243.439.945.545.047.243.144.944.044.5

Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value140154849830181134194229211174218222191841701461279471997619738710877116947967728144214962834957-11.254
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax23.226.215.718.48.028.421.729.031.131.326.931.531.228.814.328.625.225.520.216.320.916.64.115.017.021.514.321.017.716.113.715.516.09.74.310.011.213.89.69.9-2.010.6

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents

us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:AccumulatedDefinedBenefitPlansAdjustment


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value-4.02.03.03.03.05.03.03.04.03.03.03.04.03.01.01.01.01.00.80.90.91.00.90.90.90.91.21.10.91.10.60.70.70.7
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest-2.91.33.63.110.02.82.21.51.71.41.71.41.81.61.20.60.70.80.81.30.91.34.61.21.00.81.50.91.01.40.91.00.91.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-0.70.30.60.60.80.80.50.40.50.40.50.40.60.50.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.10.20.10.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome us-gaap:AccumulatedDefinedBenefitPlansAdjustment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Income Tax Expense Benefit

us-gaap:IncomeTaxExpenseBenefit

us-gaap:IncomeTaxExpenseBenefit


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value303424217.0422745484427514840-131.0595144332638286.727323927473727242731169.917-350.1255.3186.018
Percentage of IncomeTaxExpenseBenefit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax5.05.84.53.91.96.64.46.76.56.54.27.46.86.0-22.39.98.88.87.16.18.16.11.45.56.47.95.08.67.05.55.06.06.13.72.03.4-62.64.21.03.21.13.5

us-gaap:IncomeTaxExpenseBenefit us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents

us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:AccumulatedDefinedBenefitPlansAdjustment


Income
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value0.01.01.01.00.01.01.01.01.00.02.00.00.00.01.00.30.30.40.30.30.30.40.30.40.40.40.40.30.20.30.3
Percentage of IncomeTaxExpenseBenefit0.04.814.32.40.02.22.12.33.70.04.20.0-0.00.02.00.91.11.01.14.51.11.20.81.50.81.11.51.20.71.01.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.00.20.30.20.00.10.10.10.20.00.30.00.00.00.20.10.10.10.10.10.10.10.10.10.10.10.10.10.00.10.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome us-gaap:AccumulatedDefinedBenefitPlansAdjustment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Income Taxes Paid Net

us-gaap:IncomeTaxesPaidNet

us-gaap:IncomeTaxesPaidNet


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value441.0135.02.06.05.029496.02134451.03131
Percentage of IncomeTaxesPaidNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax7.30.22.40.90.50.90.84.36.60.93.24.96.30.25.35.2

Interest Income Expense Net

us-gaap:InterestIncomeExpenseNet

us-gaap:InterestIncomeExpenseNet


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value-30000000.0-29000000.0-37000000.0-34000000.0-33000000.0-33000000.0-33000000.0-32000000.0-33000000.0-36000000.0-31000000.0-30000000.0-30000000.0-30000000.0-25000000.0-26000000.0
Percentage of InterestIncomeExpenseNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-5.0-4.9-6.9-6.4-8.8-5.2-5.3-4.8-4.5-5.3-4.8-4.3-4.2-4.5-4.3-4.4

us-gaap:InterestIncomeExpenseNet us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents

us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:AccumulatedGainLossNetCashFlowHedgeParent


Interest
Period End2021-06-302020-06-30
Value-3000000.0-2000000.0
Percentage of InterestIncomeExpenseNet10.06.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-0.5-0.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome us-gaap:AccumulatedGainLossNetCashFlowHedgeParent0.00.0

Interest Paid Net

us-gaap:InterestPaidNet

us-gaap:InterestPaidNet


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value317.0638.0578.06210.0391447114710.05316
Percentage of InterestPaidNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax5.11.211.81.515.11.310.01.55.32.17.31.66.61.59.02.7

Net Income Loss

us-gaap:NetIncomeLoss

us-gaap:NetIncomeLoss


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value1101206077231391071491811671471671741512151119583614460481346546850685752424450271132412584438-17.236
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax18.220.411.214.56.121.817.322.324.624.722.724.124.522.836.618.716.416.613.110.312.810.52.79.410.613.69.312.410.710.68.79.59.96.02.36.573.89.68.66.8-3.17.1

us-gaap:NetIncomeLoss us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents

us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:AccumulatedDefinedBenefitPlansAdjustment


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value-4.02.03.02.02.04.03.02.03.02.02.03.02.03.01.01.00.01.00.50.60.50.70.60.60.50.60.80.70.50.70.30.50.40.4
Percentage of NetIncomeLoss-3.61.75.02.68.72.92.81.31.71.21.41.81.12.00.50.90.01.20.81.30.81.44.61.30.90.91.61.00.91.30.71.10.81.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-0.70.30.60.40.50.60.50.30.40.30.30.40.30.50.20.20.00.20.10.10.10.20.10.10.10.10.10.10.10.10.10.10.10.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome us-gaap:AccumulatedDefinedBenefitPlansAdjustment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:NetIncomeLoss us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value110120607723139107149181167147167
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax18.220.411.214.56.121.817.322.324.624.722.724.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.0

Operating Income Loss

us-gaap:OperatingIncomeLoss

us-gaap:OperatingIncomeLoss


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value1671801331285821516522425924420724624822212819817714910910412711037111137142117147132114991111178154911191548612411998
Percentage of OperatingIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax27.730.624.924.115.433.826.733.535.136.132.035.534.933.521.833.330.529.923.423.926.824.07.822.726.928.321.626.624.723.320.323.823.017.811.118.621.425.716.821.621.519.1

Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax

us-gaap:OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax

us-gaap:OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax


Other
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302018-12-312012-12-312012-09-302012-06-302011-12-312011-09-302011-06-30
Value4.0-6.02.00.0-2.02.0-6.01.0-4.00.71.6-3.7-6.6-2.7-1.0
Percentage of OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.7-1.00.40.0-0.30.3-0.90.1-0.60.10.3-0.7-1.3-0.5-0.2

us-gaap:OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax us-gaap:StatementEquityComponents

us-gaap:AccumulatedOtherComprehensiveIncome


Other
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value4.0-6.02.00.0-2.02.0-6.01.0-4.0
Percentage of OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax100.0100.0100.00.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.7-1.00.40.0-0.30.3-0.90.1-0.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.0

Other Comprehensive Income Loss Net Of Tax

us-gaap:OtherComprehensiveIncomeLossNetOfTax

us-gaap:OtherComprehensiveIncomeLossNetOfTax


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value3.03.0-7.03.0-4.0-29.08.0-13.0-14.0-3.0-4.01.0-16.04.0375.03.03.0-6.50.9-1.12.6-5.4-2.90.9-11.9-12.2-8.2-0.22.1292.5-6.5-2.6
Percentage of OtherComprehensiveIncomeLossNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.50.5-1.30.6-1.1-4.61.3-1.9-1.9-0.4-0.60.1-2.30.66.30.80.50.6-1.40.2-0.20.6-1.1-0.60.2-2.4-2.2-1.5-0.00.46.00.5-1.3-0.6

us-gaap:OtherComprehensiveIncomeLossNetOfTax us-gaap:StatementEquityComponents

us-gaap:AccumulatedDefinedBenefitPlansAdjustment


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-31
Value-2.0-2.0-19.0-2.0-2.0-4.0-2.0-3.06.09.0-3.0-2.0-3.028-1.00.0-1.03.8-0.6-0.5-0.7-0.6-0.5-0.6-0.7-0.5-0.7-0.5-0.4-0.4
Percentage of OtherComprehensiveIncomeLossNetOfTax-66.7-66.7271.4-66.750.013.815.421.4-200.0-225.0-300.012.5-75.075.7-20.00.0-33.3-58.5-66.745.5-26.920.7-55.65.08.5250.0-33.3-20.06.215.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-0.3-0.3-3.6-0.4-0.5-0.6-0.3-0.40.91.4-0.4-0.3-0.54.8-0.20.0-0.20.8-0.1-0.1-0.2-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:AccumulatedDefinedBenefitPlansAdjustment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedGainLossNetCashFlowHedgeParent


Other
Period End2021-06-302021-03-312020-06-302020-03-31
Value1.011-2.0-23.0
Percentage of OtherComprehensiveIncomeLossNetOfTax33.3366.750.079.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.21.9-0.5-3.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:AccumulatedGainLossNetCashFlowHedgeParent0.00.00.00.0

us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss


Other
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-312017-09-302017-06-302016-12-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-31
Value2.03.0-2.0-23.07.0-5.0-12.0-9.0-7.00.08.00.0-1.00.10.0-0.50.4-0.2-0.5-2.4-0.9-0.60.10.1-0.30.1
Percentage of OtherComprehensiveIncomeLossNetOfTax-28.6100.050.079.387.538.585.7300.0175.00.021.60.0-33.3-1.50.045.515.46.9-55.620.211.0300.04.84.04.6-3.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.40.6-0.5-3.61.1-0.7-1.6-1.3-1.10.01.40.0-0.20.00.0-0.10.1-0.0-0.1-0.5-0.2-0.10.00.0-0.10.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedOtherComprehensiveIncome


Other
Period End2021-06-30
Value3.0
Percentage of OtherComprehensiveIncomeLossNetOfTax100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:AccumulatedOtherComprehensiveIncome0.0

us-gaap:AccumulatedTranslationAdjustment


Other
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-31
Value4.0-6.02.00.0-2.02.0-6.01.00.0-4.00.0-12.07.01.06.04.04.0-10.31.5-0.12.9-2.11.9-8.9-6.60.92.72.9-5.8-2.3
Percentage of OtherComprehensiveIncomeLossNetOfTax133.3-200.066.7-0.06.925.046.2-7.1-0.0100.00.075.0175.02.7120.0133.3133.3158.5166.79.1111.572.4211.174.880.5-450.0128.6116.089.288.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.7-1.00.40.0-0.30.3-0.90.10.0-0.60.0-1.71.10.21.00.70.8-2.20.3-0.00.6-0.40.4-1.8-1.20.20.50.6-1.1-0.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:AccumulatedTranslationAdjustment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Other Nonoperating Income Expense

us-gaap:OtherNonoperatingIncomeExpense

us-gaap:OtherNonoperatingIncomeExpense


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value3.03.0-12.04.05.0-1.02.02.03.03.0-2.02.04.0-1.0-19.0-2.0-4.03.01.90.8-0.2-0.13.3-4.2-2.22.8-5.4-0.4-0.90.20.20.00.00.155-1.8-22.8-30.81.0-3.7-2.95.7
Percentage of OtherNonoperatingIncomeExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.50.5-2.20.81.3-0.20.30.30.40.4-0.30.30.6-0.2-3.2-0.3-0.70.60.40.2-0.0-0.00.7-0.9-0.40.6-1.0-0.1-0.20.00.00.00.00.011.3-0.4-4.1-5.10.2-0.6-0.51.1

us-gaap:OtherNonoperatingIncomeExpense us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents

us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:AccumulatedDefinedBenefitPlansAdjustmentNetPriorServiceCostCredit


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value3.02.03.03.03.05.03.03.04.03.03.03.04.0
Percentage of OtherNonoperatingIncomeExpense100.066.7-25.075.060.0-500.0150.0150.0133.3100.0-150.0150.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.50.30.60.60.80.80.50.40.50.40.50.40.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome us-gaap:AccumulatedDefinedBenefitPlansAdjustmentNetPriorServiceCostCredit0.00.00.00.00.00.00.00.00.00.00.00.00.0

Research And Development Expense

us-gaap:ResearchAndDevelopmentExpense

us-gaap:ResearchAndDevelopmentExpense


Research
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value413840333836473937313733332831262523242021212323232233242124242022292835232726312830
Percentage of ResearchAndDevelopmentExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax6.86.57.56.210.15.77.65.85.04.65.74.84.64.25.34.44.34.65.24.84.64.74.94.84.54.46.24.44.05.05.04.54.56.35.87.34.14.65.05.65.15.9

Revenue From Contract With Customer Excluding Assessed Tax

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value603588535532377637617669737675647692711663588595580499468434474462478493511503544553536493491466512457487493559601516574555517
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ProductOrService

alsn:Defense


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value4845445642404240373236424337
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax8.07.78.210.511.16.36.86.05.04.75.66.16.05.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax8.07.78.210.511.16.36.86.05.04.75.66.16.05.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax alsn:Defense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

alsn:NorthAmericaOffHighway


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value9.02.01.01.03.08.01.06.09.01417123133
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.50.30.20.20.81.30.20.91.22.12.61.74.45.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.50.30.20.20.81.30.20.91.22.12.61.74.45.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax alsn:NorthAmericaOffHighway100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

alsn:NorthAmericaOnHighway


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value302319284281164352330369398377303332343339
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax50.154.353.152.843.555.353.555.254.055.946.848.048.251.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax50.154.353.152.843.555.353.555.254.055.946.848.048.251.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax alsn:NorthAmericaOnHighway100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

alsn:OutsideNorthAmericaOffHighway


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value1816114.019271824402747462412
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax3.02.72.10.85.04.22.93.65.44.07.36.63.41.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax3.02.72.10.85.04.22.93.65.44.07.36.63.41.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax alsn:OutsideNorthAmericaOffHighway100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

alsn:OutsideNorthAmericaOnHighway


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value988477716072919910694959610191
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax16.314.314.413.315.911.314.714.814.413.914.713.914.213.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax16.314.314.413.315.911.314.714.814.413.914.713.914.213.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax alsn:OutsideNorthAmericaOnHighway100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

alsn:ServicePartsSupportEquipmentAndOther


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value12812211811989138135131147131149164169151
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax21.220.722.122.423.621.721.919.619.919.423.023.723.822.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax21.220.722.122.423.621.721.919.619.919.423.023.723.822.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax alsn:ServicePartsSupportEquipmentAndOther100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Selling General And Administrative Expense

us-gaap:SellingGeneralAndAdministrativeExpense

us-gaap:SellingGeneralAndAdministrativeExpense


Selling
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value807380936975928593849089939297788879838077828186757388878583877485871129610910111010196100
Percentage of SellingGeneralAndAdministrativeExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax13.312.415.017.518.311.814.912.712.612.413.912.913.113.916.513.115.215.817.818.416.417.917.017.614.814.616.315.815.916.917.815.916.719.223.019.619.516.821.317.717.419.5

Assets

us-gaap:Assets

us-gaap:Assets


Assets
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-31
Value452245344477444646334424445044714355439242374285417142604205426141424179421842394463444144084566468347894804482447714819481248114937490348664990506451085192
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:Assets us-gaap:ConsolidatedEntities

srt:ParentCompany


Assetsus-gaap:
Period End2020-12-312019-12-312018-12-31
Value756781659
Percentage of Assets16.917.615.6
Percentage of Assets16.917.615.6
Percentage of Assets srt:ParentCompany100.0100.0100.0

Liabilities

us-gaap:Liabilities

us-gaap:Liabilities


Liabilities
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-31
Value379037703721370039383731366937283687364635783601356935543516370634463442313831223300325832193352331733703406347034773426337334433508350935093666378042194370
Percentage of Liabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets83.883.183.183.285.084.382.483.484.783.084.484.085.683.483.687.083.282.474.473.773.973.473.073.470.870.470.971.972.971.170.171.671.171.672.173.574.682.684.2

Liabilities And Stockholders Equity

us-gaap:LiabilitiesAndStockholdersEquity

us-gaap:LiabilitiesAndStockholdersEquity


Liabilities
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-31
Value452245344477444646334424445044714355439242374285417142604205426141424179421842394463444144084566468347894804482447714819481248114937490348664990506451085192
Percentage of LiabilitiesAndStockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LiabilitiesAndStockholdersEquity us-gaap:ConsolidatedEntities

srt:ParentCompany


Liabilities
Period End2020-12-312019-12-312018-12-31
Value756781659
Percentage of LiabilitiesAndStockholdersEquity16.917.615.6
Percentage of Assets16.917.615.6
Percentage of Assets srt:ParentCompany100.0100.0100.0

Stockholders Equity

us-gaap:StockholdersEquity

us-gaap:StockholdersEquity


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312010-12-312009-12-31
Value7327647567466956937817436687466596846027066895556967371080111611621182118812141365141913971353129413931438136714291394135613241283888821741736
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets16.216.916.916.815.015.717.616.615.317.015.616.014.416.616.413.016.817.625.626.326.126.627.026.629.229.629.128.127.128.929.928.428.928.427.926.525.417.415.80.00.0

us-gaap:StockholdersEquity us-gaap:StatementClassOfStock

alsn:VotingCommonStock


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-312016-12-31
Value1.01.01.01.01.01.01.01.01.01.01.01.01.01.02.0
Percentage of StockholdersEquity0.10.10.10.10.10.10.10.10.10.10.20.10.20.10.2
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets alsn:VotingCommonStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:StockholdersEquity us-gaap:StatementEquityComponents

us-gaap:AccumulatedDefinedBenefitPlansAdjustment


Stockholders
Period End2021-06-302021-03-312020-12-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302014-12-31
Value-23.0-21.0-19.02.04.08.010.012159.00.03.05.08.0-20.0-19.0-19.0-18.0-21.8-21.2-21.0-20.0-18.7-18.1-17.0
Percentage of StockholdersEquity-3.1-2.7-2.50.30.61.01.31.82.01.40.00.50.71.2-3.6-2.7-2.6-1.7-2.0-1.8-1.8-1.7-1.5-1.3-1.2
Percentage of Assets-0.5-0.5-0.40.00.10.20.20.30.30.20.00.10.10.2-0.5-0.5-0.5-0.4-0.5-0.5-0.5-0.5-0.4-0.4-0.4
Percentage of Assets us-gaap:AccumulatedDefinedBenefitPlansAdjustment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedGainLossNetCashFlowHedgeParent


Stockholders
Period End2021-06-302021-03-312020-12-312020-06-302020-03-312019-12-31
Value-34.0-35.0-46.0-51.0-49.0-26.0
Percentage of StockholdersEquity-4.6-4.6-6.1-7.3-7.1-3.3
Percentage of Assets-0.8-0.8-1.0-1.1-1.1-0.6
Percentage of Assets us-gaap:AccumulatedGainLossNetCashFlowHedgeParent0.00.00.00.00.00.0

us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss


Stockholders
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302014-12-31
Value-48.0-51.0-49.0-26.0-33.0-28.0-16.0-7.00.00.00.0-8.0-8.0-7.0-7.0-5.8-5.8-5.0-5.7-4.0-3.8-0.9
Percentage of StockholdersEquity-6.4-7.3-7.1-3.3-4.4-4.2-2.1-1.10.00.00.0-1.4-1.1-0.9-0.6-0.5-0.5-0.4-0.5-0.3-0.3-0.1
Percentage of Assets-1.1-1.1-1.1-0.6-0.7-0.6-0.4-0.20.00.00.0-0.2-0.2-0.2-0.2-0.1-0.1-0.1-0.1-0.1-0.1-0.0
Percentage of Assets us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedOtherComprehensiveIncome


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value-83.0-86.0-89.0-82.0-85.0-81.0-52.0-60.0-47.0-33.0-30.0-26.0-27.0-11.0-15.0-52.0-57.0-60.0-62.9-56.4-57.3-56.0-58.8-53.4-50.5-39.5-21.0-43.9-57.0-26.07.0
Percentage of StockholdersEquity-11.3-11.3-11.8-11.0-12.2-11.7-6.7-8.1-7.0-4.4-4.6-3.8-4.5-1.6-2.2-9.4-8.2-8.1-5.8-5.1-4.9-4.7-4.9-4.4-3.7-2.8-1.5-3.2-6.9-3.51.0
Percentage of Assets-1.8-1.9-2.0-1.8-1.8-1.8-1.2-1.3-1.1-0.8-0.7-0.6-0.6-0.3-0.4-1.2-1.4-1.4-1.5-1.3-1.3-1.3-1.3-1.2-1.1-0.8-0.4-0.9-1.10.00.0
Percentage of Assets us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedTranslationAdjustment


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302014-12-31
Value-26.0-30.0-24.0-34.0-36.0-36.0-34.0-37.0-31.0-32.0-32.0-28.0-28.0-16.0-23.0-24.0-30.0-34.0-38.0-28.8-30.3-30.0-33.1-30.7-28.6-21.6
Percentage of StockholdersEquity-3.6-3.9-3.2-4.6-5.2-5.2-4.4-5.0-4.6-4.3-4.9-4.1-4.7-2.3-3.3-4.3-4.3-4.6-3.5-2.6-2.6-2.5-2.8-2.5-2.1-1.5
Percentage of Assets-0.6-0.7-0.5-0.8-0.8-0.8-0.8-0.8-0.7-0.7-0.8-0.7-0.7-0.4-0.5-0.6-0.7-0.8-0.9-0.7-0.7-0.7-0.8-0.7-0.6-0.4
Percentage of Assets us-gaap:AccumulatedTranslationAdjustment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AdditionalPaidInCapital


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value1826182018181812180618041802179917961787178817841764175817281690165116311601156015521544
Percentage of StockholdersEquity249.5238.2240.5242.9259.9260.3230.7242.1268.9239.5271.3260.8293.0255.2160.0142.2118.1113.4118.0189.9209.4209.7
Percentage of Assets40.440.140.640.839.040.840.540.241.240.742.241.642.341.841.038.334.433.932.930.10.00.0
Percentage of Assets us-gaap:AdditionalPaidInCapital0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:RetainedEarnings


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value-1012.0-971.0-974.0-985.0-1027.0-1031.0-970.0-997.0-1082.0-1010.0-1100.0-1075.0-1136.0-1055.0-586.4-444.5-215.5-173.8-202.3-683.7-786.7-816.3
Percentage of StockholdersEquity-138.3-127.1-128.8-132.0-147.8-148.8-124.2-134.2-162.0-135.4-166.9-157.2-188.7-153.1-54.3-37.4-15.4-12.1-14.9-83.2-106.1-110.8
Percentage of Assets-22.4-21.4-21.8-22.2-22.2-23.3-21.8-22.3-24.8-23.0-26.0-25.1-27.2-25.1-13.9-10.1-4.5-3.6-4.2-13.20.00.0
Percentage of Assets us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Assets Current

us-gaap:AssetsCurrent

us-gaap:AssetsCurrent


Assets
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-31
Value798820756710887666686748705881725764633716632665527537547549744690616641725795758742647652606607686578490527577648702
Percentage of AssetsCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets17.618.116.916.019.115.115.416.716.220.117.117.815.216.815.015.612.712.813.013.016.715.514.014.115.516.615.815.413.613.512.612.613.911.810.110.611.412.713.5

Cash And Cash Equivalents At Carrying Value

us-gaap:CashAndCashEquivalentsAtCarryingValue

us-gaap:CashAndCashEquivalentsAtCarryingValue


Cash
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value23829531025143411419215215332423122196195199210851202041643642992511482162652632081261591841522271208081112192314353271352252153
Percentage of CashAndCashEquivalentsAtCarryingValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets5.36.56.95.69.42.64.33.43.57.45.55.22.34.64.74.92.12.94.93.98.26.75.73.24.65.55.54.32.73.33.83.24.62.51.61.62.23.86.00.00.00.00.00.0

Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents


Cash
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302016-12-312015-12-31
Value2382953102514341141921521533242312219619519921085205252
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets5.36.56.95.69.42.64.33.43.57.45.55.22.34.64.74.92.14.95.7

Accounts Receivable Net Current

us-gaap:AccountsReceivableNetCurrent

us-gaap:AccountsReceivableNetCurrent


Accounts
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-31
Value299292228245212303253329322332279335328312221271274250196202200219195223228231207240227227175198208204165204234240194
Percentage of AccountsReceivableNetCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets6.66.45.15.54.66.85.77.47.47.66.67.87.97.35.36.46.66.04.74.84.54.94.44.94.94.84.35.04.84.73.64.14.24.23.44.14.64.73.7

Inventory Net

us-gaap:InventoryNet

us-gaap:InventoryNet


Inventory
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-31
Value206193181177201207199209188189170166170172154156147144125155150142141155155160143161169175160165162168157187168171155
Percentage of InventoryNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets4.64.34.04.04.34.74.54.74.34.34.03.94.14.03.73.73.53.43.03.73.43.23.23.43.33.43.03.33.63.63.33.43.33.43.23.73.33.43.0

Other Assets Current

us-gaap:OtherAssetsCurrent

us-gaap:OtherAssetsCurrent


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-31
Value554037374042425842362924242725282123202629292826272524292931283331283235314438
Percentage of OtherAssetsCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.20.90.80.80.90.90.91.31.00.80.70.60.60.60.60.70.50.60.50.60.70.70.70.60.60.50.50.60.60.70.60.70.60.60.70.70.60.90.7

Property Plant And Equipment Gross

us-gaap:PropertyPlantAndEquipmentGross

us-gaap:PropertyPlantAndEquipmentGross


Property
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value1684159513991298124812141181116411111015
Percentage of PropertyPlantAndEquipmentGross100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets37.635.833.030.929.627.624.624.222.819.6

us-gaap:PropertyPlantAndEquipmentGross us-gaap:PropertyPlantAndEquipmentByType

us-gaap:BuildingAndBuildingImprovements


Property
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-31
Value423342336322303293
Percentage of PropertyPlantAndEquipmentGross25.121.424.024.824.324.2
Percentage of Assets9.47.77.97.77.26.7
Percentage of Assets us-gaap:BuildingAndBuildingImprovements0.00.00.00.00.00.0

us-gaap:LandImprovements


Property
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-31
Value262524242525
Percentage of PropertyPlantAndEquipmentGross1.51.61.71.82.02.1
Percentage of Assets0.60.60.60.60.60.6
Percentage of Assets us-gaap:LandImprovements0.00.00.00.00.00.0

us-gaap:MachineryAndEquipment


Property
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-31
Value783722643601589585
Percentage of PropertyPlantAndEquipmentGross46.545.346.046.347.248.2
Percentage of Assets17.516.215.214.314.013.3
Percentage of Assets us-gaap:MachineryAndEquipment0.00.00.00.00.00.0

us-gaap:SoftwareAndSoftwareDevelopmentCosts


Property
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-31
Value175163143136127121
Percentage of PropertyPlantAndEquipmentGross10.410.210.210.510.210.0
Percentage of Assets3.93.73.43.23.02.8
Percentage of Assets us-gaap:SoftwareAndSoftwareDevelopmentCosts0.00.00.00.00.00.0

us-gaap:ToolsDiesAndMolds


Property
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-31
Value223202201169157160
Percentage of PropertyPlantAndEquipmentGross13.212.714.413.012.613.2
Percentage of Assets5.04.54.74.03.73.6
Percentage of Assets us-gaap:ToolsDiesAndMolds0.00.00.00.00.00.0

Construction In Progress Gross

us-gaap:ConstructionInProgressGross

us-gaap:ConstructionInProgressGross


Construction
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value541415246452839485672
Percentage of ConstructionInProgressGross100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.23.21.21.11.10.70.81.01.21.4

Accumulated Depreciation Depletion And Amortization Property Plant And Equipment

us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment

us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment


Accumulated
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value1046979933850784734667600515433
Percentage of AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets23.422.022.020.218.616.713.912.510.68.4

Amortization Of Intangible Assets

us-gaap:AmortizationOfIntangibleAssets

us-gaap:AmortizationOfIntangibleAssets


Amortization
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value111212111316212221222122222223222322232323232424242424242424252525293737373737383838
Percentage of AmortizationOfIntangibleAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Property Plant And Equipment Net

us-gaap:PropertyPlantAndEquipmentNet

us-gaap:PropertyPlantAndEquipmentNet


Property
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312010-12-31
Value665644638636634627616561490473466448442440448456453457464454460466479479485495514526538551563553563585596592581591581595
Percentage of PropertyPlantAndEquipmentNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets14.714.214.314.313.714.213.812.511.310.811.010.510.610.310.710.710.910.911.010.710.310.510.910.510.410.310.710.911.311.411.711.511.411.912.311.911.511.611.20.0

us-gaap:PropertyPlantAndEquipmentNet us-gaap:StatementGeographical

alsn:OtherCountries


Property
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-31
Value4.05.04.04.04.44.85.46.7
Percentage of PropertyPlantAndEquipmentNet0.60.80.90.90.91.01.01.2
Percentage of Assets0.10.10.10.10.10.10.10.1
Percentage of Assets alsn:OtherCountries0.00.00.00.00.00.00.00.0

country:HU


Property
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-31
Value1111111211121518
Percentage of PropertyPlantAndEquipmentNet1.71.82.42.72.42.62.93.2
Percentage of Assets0.20.20.30.30.30.30.30.4
Percentage of Assets country:HU0.00.00.00.00.00.00.00.0

country:IN


Property
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-31
Value1217243236435159
Percentage of PropertyPlantAndEquipmentNet1.92.85.27.17.89.010.010.6
Percentage of Assets0.30.40.60.80.91.01.11.2
Percentage of Assets country:IN0.00.00.00.00.00.00.00.0

country:US


Property
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-31
Value611583427400412419442478
Percentage of PropertyPlantAndEquipmentNet95.894.691.689.388.887.486.085.0
Percentage of Assets13.613.110.19.59.89.59.29.9
Percentage of Assets country:US0.00.00.00.00.00.00.00.0

Goodwill

us-gaap:Goodwill

us-gaap:Goodwill


Goodwill
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-31
Value206420642064206320622041204120402019194119411941194119411941194119411941194119411941194119411941194119411941194119411941194119411941194119411941194119411941
Percentage of Goodwill100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets45.645.546.146.444.546.145.945.646.444.245.845.346.545.646.245.646.946.446.045.843.543.744.042.541.440.540.440.240.740.340.340.339.339.639.938.938.338.037.4

Indefinite Lived Intangible Assets Excluding Goodwill

us-gaap:IndefiniteLivedIntangibleAssetsExcludingGoodwill us-gaap:IndefiniteLivedIntangibleAssetsByMajorClass

us-gaap:IndefiniteLivedIntangibleAssetsExcludingGoodwill

alsn:IndefiniteLivedInProcessResearchAndDevelopment


Indefinite
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302018-12-31
Value25252525255050500.0
Percentage of IndefiniteLivedIntangibleAssetsExcludingGoodwill100.0100.0100.0100.0100.0100.0100.0100.00.0
Percentage of Assets0.60.60.60.60.51.11.11.10.0
Percentage of Assets alsn:IndefiniteLivedInProcessResearchAndDevelopment0.00.00.00.00.00.00.00.00.0

us-gaap:TradeNames


Indefinite
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value791791791791791791791791790790
Percentage of IndefiniteLivedIntangibleAssetsExcludingGoodwill3164.03164.03164.03164.03164.01582.01582.01582.00.00.0
Percentage of Assets17.517.417.717.817.117.917.817.718.118.6
Percentage of Assets us-gaap:TradeNames0.00.00.00.00.00.00.00.00.00.0

Intangible Assets Net Excluding Goodwill

us-gaap:IntangibleAssetsNetExcludingGoodwill

us-gaap:IntangibleAssetsNetExcludingGoodwill


Intangible
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-31
Value9409519639759861026104210611079104410661087110911311153117511971220124212651288131113341439146314871512153615611586161016361661168617161753179118281866
Percentage of IntangibleAssetsNetExcludingGoodwill100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets20.821.021.521.921.323.223.423.724.823.825.225.426.626.527.427.628.929.229.529.928.929.530.331.531.231.131.531.932.732.933.534.033.634.435.335.135.435.835.9

Finite Lived Intangible Assets Net

us-gaap:FiniteLivedIntangibleAssetsNet us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:FiniteLivedIntangibleAssetsNet

alsn:CustomerRelationshipsCommercial


Finite
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-31
Value110120131142153164175186194202213224235247259270282294305317330342354367379392404418430443456470483497510
Percentage of FiniteLivedIntangibleAssetsNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets2.42.62.93.23.33.73.94.24.54.65.05.25.65.86.26.36.87.07.27.57.47.78.08.08.18.28.48.79.09.29.59.89.810.110.5
Percentage of Assets alsn:CustomerRelationshipsCommercial0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

alsn:CustomerRelationshipsDefense


Finite
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-31
Value1314151516171818202021222324242526272728293031313233343536373738394041
Percentage of FiniteLivedIntangibleAssetsNet11.811.711.510.610.510.410.39.710.39.99.99.89.89.79.39.39.29.29.09.08.98.88.78.78.68.68.58.48.48.48.38.38.28.28.1
Percentage of Assets0.30.30.30.30.30.40.40.40.50.50.50.50.60.60.60.60.60.60.70.70.70.70.70.70.70.70.70.70.80.80.80.80.80.80.9
Percentage of Assets alsn:CustomerRelationshipsDefense0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

alsn:ProprietaryTechnology


Finite
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-31
Value1.01.01.02.01.04.08.016253242516170809099108118127137146156165175184194203213222232242251261270
Percentage of FiniteLivedIntangibleAssetsNet0.90.80.81.40.72.44.68.612.915.819.722.826.028.330.933.335.136.738.640.141.642.944.145.146.247.148.048.849.550.250.951.552.052.553.0
Percentage of Assets0.00.00.00.00.00.10.20.40.60.71.01.21.51.61.92.12.42.62.83.03.13.33.53.63.73.94.04.24.54.64.85.05.15.35.6
Percentage of Assets alsn:ProprietaryTechnology0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Intangible Assets Net Including Goodwill

us-gaap:IntangibleAssetsNetIncludingGoodwill

us-gaap:IntangibleAssetsNetIncludingGoodwill


Intangible
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302011-12-31
Value30043015302730383048306730833101309829853007302830503072309431163138316131833206322932523275338034043428345334773502352735513577360236273657369437323807
Percentage of IntangibleAssetsNetIncludingGoodwill100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets66.466.567.668.365.869.369.369.471.168.071.070.773.172.173.673.175.875.675.575.672.473.274.374.072.771.671.972.173.473.273.874.372.974.075.274.073.773.3

Operating Lease Right Of Use Asset

us-gaap:OperatingLeaseRightOfUseAsset

us-gaap:OperatingLeaseRightOfUseAsset


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312019-01-01
Value2020212222232421221314
Percentage of OperatingLeaseRightOfUseAsset100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.40.40.50.50.50.50.50.50.50.30.0

us-gaap:OperatingLeaseRightOfUseAsset us-gaap:PropertyPlantAndEquipmentByType

us-gaap:Building


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value18181920202121191911
Percentage of OperatingLeaseRightOfUseAsset90.090.090.590.990.991.387.590.586.484.6
Percentage of Assets0.40.40.40.40.40.50.50.40.40.3
Percentage of Assets us-gaap:Building0.00.00.00.00.00.00.00.00.00.0

Other Assets Noncurrent

us-gaap:OtherAssetsNoncurrent

us-gaap:OtherAssetsNoncurrent


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-31
Value5555566264646561625339454632312424242328293234646668777582888973849190938498101
Percentage of OtherAssetsNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.21.21.31.41.41.41.51.41.41.20.91.11.10.80.70.60.60.60.60.70.70.70.81.41.41.41.61.61.71.81.91.51.71.91.91.91.71.91.9

Accounts Payable Current

us-gaap:AccountsPayableCurrent

us-gaap:AccountsPayableCurrent


Accounts
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-31
Value167167157133138191150185208209169198210203159184172158127134138134126140142157151182174173150163168161133176186213162
Percentage of AccountsPayableCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets3.73.73.53.03.04.33.44.14.84.84.04.65.04.83.84.34.23.83.03.23.13.02.93.13.03.33.23.83.73.63.13.43.43.32.73.53.74.23.1

Contract With Customer Liability Current

us-gaap:ContractWithCustomerLiabilityCurrent

us-gaap:ContractWithCustomerLiabilityCurrent


Contract
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value39353433343435353434343538404133
Percentage of ContractWithCustomerLiabilityCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.90.80.80.70.70.80.80.80.80.80.80.80.90.91.00.8

us-gaap:ContractWithCustomerLiabilityCurrent us-gaap:ProductOrService

alsn:ExtendedTransmissionCoverage


Contract
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value30292828272729282929303029293029
Percentage of ContractWithCustomerLiabilityCurrent76.982.982.484.879.479.482.980.085.385.388.285.776.372.573.287.9
Percentage of Assets0.70.60.60.60.60.60.70.60.70.70.70.70.70.70.70.7
Percentage of Assets alsn:ExtendedTransmissionCoverage0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Liabilities Current

us-gaap:LiabilitiesCurrent

us-gaap:LiabilitiesCurrent


Liabilities
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-31
Value429418373382356426417477468465426448442436417444397378342335340319304316321334345386378411387398414396377412409451449
Percentage of LiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets9.59.28.38.67.79.69.410.710.710.610.110.510.610.29.910.49.69.08.17.97.67.26.96.96.97.07.28.07.98.58.08.38.48.17.88.38.18.88.7

Long Term Debt Current

us-gaap:LongTermDebtCurrent

us-gaap:LongTermDebtCurrent


Long
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-31
Value6.06.06.06.06.06.06.06.06.05.00.00.00.012121212121111242424222217171717191711232319168.08.031
Percentage of LongTermDebtCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.10.10.10.10.10.10.10.10.10.10.00.00.00.30.30.30.30.30.30.30.50.60.60.50.50.40.40.40.40.40.40.20.50.50.40.30.20.20.6

Operating Lease Liability Current

us-gaap:OperatingLeaseLiabilityCurrent

us-gaap:OperatingLeaseLiabilityCurrent


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value4000000.04000000.04000000.04000000.05000000.05000000.05000000.04000000.04000000.03000000.00
Percentage of OperatingLeaseLiabilityCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0
Percentage of Assets0.10.10.10.10.10.10.10.10.10.10.0

Other Liabilities Current

us-gaap:OtherLiabilitiesCurrent

us-gaap:OtherLiabilitiesCurrent


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-31
Value188178140176149170202226193190197189166157183193164158150136125110106105113114131141140147152162165154167166161178199
Percentage of OtherLiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets4.23.93.14.03.23.84.55.14.44.34.64.44.03.74.44.54.03.83.63.22.82.52.42.32.42.42.72.93.03.13.23.43.33.23.43.33.23.53.8

Taxes Payable Current

us-gaap:TaxesPayableCurrent

us-gaap:TaxesPayableCurrent


Taxes
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302011-12-31
Value112611241111121110.02310.08.0141310.01919289.9161715121110108.5127.37.08.69.28.38.36.97.59.617
Percentage of TaxesPayableCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.20.60.20.50.20.20.30.20.20.50.20.20.30.30.20.40.50.70.20.40.40.30.30.30.20.20.20.30.20.10.20.20.20.20.10.20.20.3

Long Term Debt

us-gaap:LongTermDebt

us-gaap:LongTermDebt


Long
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-31
Value253525362538254028162543254425462548254825482548257325762579238724302187219024022409241424682520258926692675266027192785279128012899301231663345
Percentage of LongTermDebt100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets56.155.956.757.160.857.557.256.958.060.159.561.160.461.360.557.658.151.951.754.552.851.651.552.553.755.955.555.356.556.456.957.658.159.562.064.4

us-gaap:LongTermDebt us-gaap:DebtInstrument

alsn:FivePointEightSevenFivePercentageSeniorNotesDue2029


Long
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value5005005005005005005005005005000.0
Percentage of LongTermDebt19.719.719.719.717.819.719.719.60.019.60.0
Percentage of Assets11.111.011.211.210.811.311.211.211.511.40.0
Percentage of Assets alsn:FivePointEightSevenFivePercentageSeniorNotesDue20290.00.00.00.00.00.00.00.00.00.00.0

alsn:NewRevolvingCreditFacility


Long
Period End2020-11-302019-10-312019-06-302019-03-31
Value65050600600
Percentage of LongTermDebt0.00.00.023.5
Percentage of Assets0.00.013.813.7
Percentage of Assets alsn:NewRevolvingCreditFacility0.00.00.00.0

alsn:SeniorSecuredCreditFacilityTermLoanVariableDue2026


Long
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value6356366386406416436446466480.0
Percentage of LongTermDebt25.025.125.125.222.825.325.325.40.00.0
Percentage of Assets14.014.014.314.413.814.514.514.414.90.0
Percentage of Assets alsn:SeniorSecuredCreditFacilityTermLoanVariableDue20260.00.00.00.00.00.00.00.00.00.0

Long Term Debt Noncurrent

us-gaap:LongTermDebtNoncurrent

us-gaap:LongTermDebtNoncurrent


Long
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302011-12-31
Value25052506250725102786251225122513251425142523252225202532253425362348239021462148234323482352238623922450250225722651265626602719278527912801289930123345
Percentage of LongTermDebtNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets55.455.356.056.560.156.856.456.257.757.259.558.960.459.460.359.556.757.250.950.752.552.953.452.351.151.252.153.355.655.155.356.556.456.957.658.159.564.4

Deferred Income Tax Liabilities Net

us-gaap:DeferredIncomeTaxLiabilitiesNet

us-gaap:DeferredIncomeTaxLiabilitiesNet


Deferred
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value473459442424421415387380355339329322276
Percentage of DeferredIncomeTaxLiabilitiesNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets10.510.19.99.59.19.48.78.58.27.77.87.56.6

Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent

us-gaap:PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent us-gaap:RetirementPlanType

us-gaap:PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Pension
Period End2020-12-312019-12-312018-12-31
Value1049190
Percentage of PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent100.0100.0100.0
Percentage of Assets2.32.02.1
Percentage of Assets us-gaap:OtherPostretirementBenefitPlansDefinedBenefit0.00.00.0

us-gaap:PensionPlansDefinedBenefit


Pension
Period End2020-12-312019-12-312018-12-31
Value7.00.00.0
Percentage of PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent6.70.00.0
Percentage of Assets0.20.00.0
Percentage of Assets us-gaap:PensionPlansDefinedBenefit0.00.00.0

Other Liabilities Noncurrent

us-gaap:OtherLiabilitiesNoncurrent

us-gaap:OtherLiabilitiesNoncurrent


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-31
Value249250260246245246221226219194172179182187181231235234233253255257248251225224211189171158153193188208213238237244239
Percentage of OtherLiabilitiesNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets5.55.55.85.55.35.65.05.15.04.44.14.24.44.44.35.45.75.65.56.05.75.85.65.54.84.74.43.93.63.33.24.03.84.34.44.84.74.84.6

Operating Lease Liability Noncurrent

us-gaap:OperatingLeaseLiabilityNoncurrent

us-gaap:OperatingLeaseLiabilityNoncurrent


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312019-01-01
Value1516171717171816179.09.0
Percentage of OperatingLeaseLiabilityNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.30.40.40.40.40.40.40.40.40.20.0

Lessee Operating Lease Liability Payments Due Year Two

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo


Lessee
Period End2021-06-302021-03-312020-12-312020-09-30
Value3000000.03000000.04000000.04000000.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearTwo100.0100.0100.0100.0
Percentage of Assets0.10.10.10.1

Lessee Operating Lease Liability Payments Due Year Three

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree


Lessee
Period End2021-06-302021-03-312020-12-312020-09-30
Value2000000.02000000.03000000.03000000.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearThree100.0100.0100.0100.0
Percentage of Assets0.00.00.10.1

Lessee Operating Lease Liability Payments Due Year Five

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive


Lessee
Period End2020-12-31
Value1000000.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearFive100.0
Percentage of Assets0.0

Lessee Operating Lease Liability Payments Due After Year Five

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive


Lessee
Period End2020-12-31
Value8000000.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive100.0
Percentage of Assets0.2

Operating Lease Liability

us-gaap:OperatingLeaseLiability

us-gaap:OperatingLeaseLiability


Operating
Period End2021-06-302021-03-312020-12-312020-09-30
Value19202121
Percentage of OperatingLeaseLiability100.0100.0100.0100.0
Percentage of Assets0.40.40.50.5

Lessee Operating Lease Liability Payments Due

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue


Lessee
Period End2021-06-302021-03-312020-12-312020-09-30
Value23242324
Percentage of LesseeOperatingLeaseLiabilityPaymentsDue100.0100.0100.0100.0
Percentage of Assets0.50.50.50.5

Lessee Operating Lease Liability Undiscounted Excess Amount

us-gaap:LesseeOperatingLeaseLiabilityUndiscountedExcessAmount

us-gaap:LesseeOperatingLeaseLiabilityUndiscountedExcessAmount


Lessee
Period End2021-06-302021-03-312020-12-312020-09-30
Value4000000.04000000.02000000.03000000.0
Percentage of LesseeOperatingLeaseLiabilityUndiscountedExcessAmount100.0100.0100.0100.0
Percentage of Assets0.10.10.00.1

Stockholders Equity

us-gaap:StockholdersEquity

us-gaap:StockholdersEquity


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312010-12-312009-12-31
Value7327647567466956937817436687466596846027066895556967371080111611621182118812141365141913971353129413931438136714291394135613241283888821741736
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets16.216.916.916.815.015.717.616.615.317.015.616.014.416.616.413.016.817.625.626.326.126.627.026.629.229.629.128.127.128.929.928.428.928.427.926.525.417.415.80.00.0

us-gaap:StockholdersEquity us-gaap:StatementClassOfStock

alsn:VotingCommonStock


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-312016-12-31
Value1.01.01.01.01.01.01.01.01.01.01.01.01.01.02.0
Percentage of StockholdersEquity0.10.10.10.10.10.10.10.10.10.10.20.10.20.10.2
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets alsn:VotingCommonStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:StockholdersEquity us-gaap:StatementEquityComponents

us-gaap:AccumulatedDefinedBenefitPlansAdjustment


Stockholders
Period End2021-06-302021-03-312020-12-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302014-12-31
Value-23.0-21.0-19.02.04.08.010.012159.00.03.05.08.0-20.0-19.0-19.0-18.0-21.8-21.2-21.0-20.0-18.7-18.1-17.0
Percentage of StockholdersEquity-3.1-2.7-2.50.30.61.01.31.82.01.40.00.50.71.2-3.6-2.7-2.6-1.7-2.0-1.8-1.8-1.7-1.5-1.3-1.2
Percentage of Assets-0.5-0.5-0.40.00.10.20.20.30.30.20.00.10.10.2-0.5-0.5-0.5-0.4-0.5-0.5-0.5-0.5-0.4-0.4-0.4
Percentage of Assets us-gaap:AccumulatedDefinedBenefitPlansAdjustment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedGainLossNetCashFlowHedgeParent


Stockholders
Period End2021-06-302021-03-312020-12-312020-06-302020-03-312019-12-31
Value-34.0-35.0-46.0-51.0-49.0-26.0
Percentage of StockholdersEquity-4.6-4.6-6.1-7.3-7.1-3.3
Percentage of Assets-0.8-0.8-1.0-1.1-1.1-0.6
Percentage of Assets us-gaap:AccumulatedGainLossNetCashFlowHedgeParent0.00.00.00.00.00.0

us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss


Stockholders
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302014-12-31
Value-48.0-51.0-49.0-26.0-33.0-28.0-16.0-7.00.00.00.0-8.0-8.0-7.0-7.0-5.8-5.8-5.0-5.7-4.0-3.8-0.9
Percentage of StockholdersEquity-6.4-7.3-7.1-3.3-4.4-4.2-2.1-1.10.00.00.0-1.4-1.1-0.9-0.6-0.5-0.5-0.4-0.5-0.3-0.3-0.1
Percentage of Assets-1.1-1.1-1.1-0.6-0.7-0.6-0.4-0.20.00.00.0-0.2-0.2-0.2-0.2-0.1-0.1-0.1-0.1-0.1-0.1-0.0
Percentage of Assets us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedOtherComprehensiveIncome


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value-83.0-86.0-89.0-82.0-85.0-81.0-52.0-60.0-47.0-33.0-30.0-26.0-27.0-11.0-15.0-52.0-57.0-60.0-62.9-56.4-57.3-56.0-58.8-53.4-50.5-39.5-21.0-43.9-57.0-26.07.0
Percentage of StockholdersEquity-11.3-11.3-11.8-11.0-12.2-11.7-6.7-8.1-7.0-4.4-4.6-3.8-4.5-1.6-2.2-9.4-8.2-8.1-5.8-5.1-4.9-4.7-4.9-4.4-3.7-2.8-1.5-3.2-6.9-3.51.0
Percentage of Assets-1.8-1.9-2.0-1.8-1.8-1.8-1.2-1.3-1.1-0.8-0.7-0.6-0.6-0.3-0.4-1.2-1.4-1.4-1.5-1.3-1.3-1.3-1.3-1.2-1.1-0.8-0.4-0.9-1.10.00.0
Percentage of Assets us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedTranslationAdjustment


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302014-12-31
Value-26.0-30.0-24.0-34.0-36.0-36.0-34.0-37.0-31.0-32.0-32.0-28.0-28.0-16.0-23.0-24.0-30.0-34.0-38.0-28.8-30.3-30.0-33.1-30.7-28.6-21.6
Percentage of StockholdersEquity-3.6-3.9-3.2-4.6-5.2-5.2-4.4-5.0-4.6-4.3-4.9-4.1-4.7-2.3-3.3-4.3-4.3-4.6-3.5-2.6-2.6-2.5-2.8-2.5-2.1-1.5
Percentage of Assets-0.6-0.7-0.5-0.8-0.8-0.8-0.8-0.8-0.7-0.7-0.8-0.7-0.7-0.4-0.5-0.6-0.7-0.8-0.9-0.7-0.7-0.7-0.8-0.7-0.6-0.4
Percentage of Assets us-gaap:AccumulatedTranslationAdjustment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AdditionalPaidInCapital


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value1826182018181812180618041802179917961787178817841764175817281690165116311601156015521544
Percentage of StockholdersEquity249.5238.2240.5242.9259.9260.3230.7242.1268.9239.5271.3260.8293.0255.2160.0142.2118.1113.4118.0189.9209.4209.7
Percentage of Assets40.440.140.640.839.040.840.540.241.240.742.241.642.341.841.038.334.433.932.930.10.00.0
Percentage of Assets us-gaap:AdditionalPaidInCapital0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:RetainedEarnings


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value-1012.0-971.0-974.0-985.0-1027.0-1031.0-970.0-997.0-1082.0-1010.0-1100.0-1075.0-1136.0-1055.0-586.4-444.5-215.5-173.8-202.3-683.7-786.7-816.3
Percentage of StockholdersEquity-138.3-127.1-128.8-132.0-147.8-148.8-124.2-134.2-162.0-135.4-166.9-157.2-188.7-153.1-54.3-37.4-15.4-12.1-14.9-83.2-106.1-110.8
Percentage of Assets-22.4-21.4-21.8-22.2-22.2-23.3-21.8-22.3-24.8-23.0-26.0-25.1-27.2-25.1-13.9-10.1-4.5-3.6-4.2-13.20.00.0
Percentage of Assets us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Common Stock Value

us-gaap:CommonStockValue us-gaap:StatementClassOfStock

us-gaap:CommonStockValue

alsn:VotingCommonStock


Common
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-31
Value1000000.01000000.01000000.01000000.01000000.01000000.01000000.01000000.01000000.01000000.01000000.01000000.01000000.01000000.01000000.01000000.01000000.02000000.01600000.01700000.01700000.01700000.01700000.01800000.01800000.01800000.01800000.0
Percentage of CommonStockValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets alsn:VotingCommonStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Additional Paid In Capital Common Stock

us-gaap:AdditionalPaidInCapitalCommonStock

us-gaap:AdditionalPaidInCapitalCommonStock


Additional
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-31
Value182618201818181218061804180217991796178817881784176417621758175017451736172817071696169216901688168516811651
Percentage of AdditionalPaidInCapitalCommonStock100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets40.440.140.640.839.040.840.540.241.240.742.241.642.341.441.841.142.141.541.040.338.038.138.337.036.035.134.4

us-gaap:AdditionalPaidInCapitalCommonStock us-gaap:ConsolidatedEntities

srt:ParentCompany


Additional
Period End2020-12-312019-12-312018-12-31
Value181818021788
Percentage of AdditionalPaidInCapitalCommonStock100.0100.0100.0
Percentage of Assets40.640.542.2
Percentage of Assets srt:ParentCompany240.5230.7271.3

Retained Earnings Accumulated Deficit

us-gaap:RetainedEarningsAccumulatedDeficit

us-gaap:RetainedEarningsAccumulatedDeficit


Retained
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-31
Value-1012.0-971.0-974.0-985.0-1027.0-1031.0-970.0-997.0-1082.0-1010.0-1100.0-1075.0-1136.0-1046.0-1055.0-1144.0-993.0-941.0-586.4-535.7-478.6-455.2-444.5-422.4-270.7-212.9-215.5-239.1-286.7-214.6-173.8-194.9-157.7-185.9-202.3-202.5223-625.7-683.7
Percentage of RetainedEarningsAccumulatedDeficit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets-22.4-21.4-21.8-22.2-22.2-23.3-21.8-22.3-24.8-23.0-26.0-25.1-27.2-24.6-25.1-26.8-24.0-22.5-13.9-12.6-10.7-10.2-10.1-9.2-5.8-4.4-4.5-5.0-6.0-4.5-3.6-4.1-3.2-3.8-4.2-4.14.4-12.2-13.2

us-gaap:RetainedEarningsAccumulatedDeficit us-gaap:ConsolidatedEntities

srt:ParentCompany


Retained
Period End2020-12-312019-12-312018-12-31
Value-974.0-970.0-1100.0
Percentage of RetainedEarningsAccumulatedDeficit100.0100.0100.0
Percentage of Assets-21.8-21.8-26.0
Percentage of Assets srt:ParentCompany-128.8-124.2-166.9

Accumulated Other Comprehensive Income Loss Net Of Tax

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax


Accumulated
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-31
Value-83.0-86.0-89.0-82.0-85.0-81.0-52.0-60.0-47.0-33.0-30.0-26.0-27.0-11.0-15.0-52.0-57.0-60.0-62.9-56.4-57.3-56.2-58.8-53.4-50.5-51.4-39.5-27.3-19.1-18.9-21.0-50.5-53.0-46.5-43.9-51.958-50.1-57.0
Percentage of AccumulatedOtherComprehensiveIncomeLossNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets-1.8-1.9-2.0-1.8-1.8-1.8-1.2-1.3-1.1-0.8-0.7-0.6-0.6-0.3-0.4-1.2-1.4-1.4-1.5-1.3-1.3-1.3-1.3-1.2-1.1-1.1-0.8-0.6-0.4-0.4-0.4-1.0-1.1-0.9-0.9-1.01.2-1.0-1.1

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax us-gaap:ConsolidatedEntities

srt:ParentCompany


Accumulated
Period End2020-12-312019-12-312018-12-31
Value-89.0-52.0-30.0
Percentage of AccumulatedOtherComprehensiveIncomeLossNetOfTax100.0100.0100.0
Percentage of Assets-2.0-1.2-0.7
Percentage of Assets srt:ParentCompany-11.8-6.7-4.6

Stock Issued During Period Value New Issues

us-gaap:StockIssuedDuringPeriodValueNewIssues

us-gaap:StockIssuedDuringPeriodValueNewIssues


Stock
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value1.0-1.00.00.00.0-1.00.01.04.0-4.00.017
Percentage of StockIssuedDuringPeriodValueNewIssues100.0100.00.00.00.0100.00.0100.0100.0100.00.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:StockIssuedDuringPeriodValueNewIssues us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital


Stock
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value1.0-1.00.00.00.0-1.00.01.04.0-4.00.017
Percentage of StockIssuedDuringPeriodValueNewIssues100.0100.00.00.00.0100.00.0100.0100.0100.00.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets us-gaap:AdditionalPaidInCapital0.00.00.00.00.00.00.00.00.00.00.00.0

Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue


Adjustments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value5.03.06.06.02.03.03.02.05.03.04.03.0
Percentage of AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital


Adjustments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value5.03.06.06.02.03.03.02.05.03.04.03.0
Percentage of AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets us-gaap:AdditionalPaidInCapital0.00.00.00.00.00.00.00.00.00.00.00.0

Net Cash Provided By Used In Operating Activities

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInOperatingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value1431281631589214820221223919423223921315316621598138131129541121381061397120383109
Percentage of NetCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax23.721.830.529.724.423.232.731.732.428.735.934.530.023.128.236.120.028.128.125.312.023.028.119.123.213.935.515.121.3

Net Cash Provided By Used In Investing Activities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value-48.0-21.0-35.0-31.0-24.0-21.0-82.0-146.0-158.0-19.0-51.0-23.0-19.0-10.0-51.0-20.0-15.1-35.7-15.2-11.5-19.1-30.2-38.5-34.6-35.4-40.4-30.020-5.8
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-8.0-3.6-6.5-5.8-6.4-3.3-13.3-21.8-21.4-2.8-7.9-3.3-2.7-1.5-8.7-3.4-3.1-7.3-3.3-2.2-4.2-6.2-7.8-6.2-5.9-7.8-5.23.7-1.1

Net Cash Provided By Used In Financing Activities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-30
Value-153.0-121.0-72.0-312.0252-203.0-81.0-65.0-251.0-83.0-171.0-90.0-290.0-149.0-127.0-71.0-105.7-69.8-190.0-19.82.1-85.2-120.2-170.3-217.8-80.6-103.1
Percentage of NetCashProvidedByUsedInFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-25.4-20.6-13.5-58.666.8-31.9-13.1-9.7-34.1-12.3-26.4-13.0-40.8-22.5-21.6-11.9-21.4-14.2-40.7-3.90.5-17.5-24.4-30.4-36.2-15.6-18.0

Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect


Cash
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value-57.0-15.059-183.0320-78.040-1.0-171.09310.0
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-9.5-2.611.0-34.484.9-12.26.5-0.1-23.213.81.5

Amortization Of Financing Costs

us-gaap:AmortizationOfFinancingCosts

us-gaap:AmortizationOfFinancingCosts


Amortization
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value0.01.01.01.01.01.01.02.01.01.01.02.01.02.02.01.02.01.01.41.42.02.02.31.91.91.91.91.92.32.02.53.71.82.93.26.72.22.42.72.83.72.9
Percentage of AmortizationOfFinancingCosts0.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Deferred Income Tax Expense Benefit

us-gaap:DeferredIncomeTaxExpenseBenefit

us-gaap:DeferredIncomeTaxExpenseBenefit


Deferred
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value1514233.08.0354.02820136.0211312-122.0281925332631224.524323426433427202832168.019-351.8215.9134.915
Percentage of DeferredIncomeTaxExpenseBenefit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Increase Decrease In Accounts Payable

us-gaap:IncreaseDecreaseInAccountsPayable

us-gaap:IncreaseDecreaseInAccountsPayable


Increase
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value30-1.0-54.021-27.0-21.0-11.034-20.0-17.02.044-26.0131330-6.1-4.14.47.7-14.6-1.4-14.85.7-30.99.01.122-13.4-4.67.028-43.0-10.3-26.350-45.6191633
Percentage of IncreaseDecreaseInAccountsPayable100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Increase Decrease In Accounts Receivable

us-gaap:IncreaseDecreaseInAccountsReceivable

us-gaap:IncreaseDecreaseInAccountsReceivable


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value7.066-20.031-90.051-77.0-4.0-10.054-56.07.02090-52.0-3.02252-2.22.3-19.523-28.3-3.9-3.626-31.6150.052-23.7-10.63.940-40.2-31.7-2.944-27.3-13.32243
Percentage of IncreaseDecreaseInAccountsReceivable100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Increase Decrease In Inventories

us-gaap:IncreaseDecreaseInInventories

us-gaap:IncreaseDecreaseInInventories


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value12141.0-25.0-6.09.0-9.04.0-2.0183.0-2.01.016-3.09.03.016-27.04.66.90.1-13.81.8-5.920-16.4-5.1-6.114-5.62.2-4.412-29.817-0.714-7.7-4.11210
Percentage of IncreaseDecreaseInInventories100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Increase Decrease In Other Operating Capital Net

us-gaap:IncreaseDecreaseInOtherOperatingCapitalNet

us-gaap:IncreaseDecreaseInOtherOperatingCapitalNet


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value9.0-34.032-42.0213220-12.012-4.03.0-24.02.0-3.029-25.0-11.0-4.0-24.6-14.6-8.9-3.0-16.5-20.34.73019-13.23.9-18.9-16.1-3.66.816-9.9-13.1104.527-26.340-17.8
Percentage of IncreaseDecreaseInOtherOperatingCapitalNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Net Cash Provided By Used In Operating Activities

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInOperatingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value1431281631589214820221223919423223921315316621598138131129541121381061397120383109
Percentage of NetCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax23.721.830.529.724.423.232.731.732.428.735.934.530.023.128.236.120.028.128.125.312.023.028.119.123.213.935.515.121.3

Net Income Loss

us-gaap:NetIncomeLoss

us-gaap:NetIncomeLoss


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value1101206077231391071491811671471671741512151119583614460481346546850685752424450271132412584438-17.236
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax18.220.411.214.56.121.817.322.324.624.722.724.124.522.836.618.716.416.613.110.312.810.52.79.410.613.69.312.410.710.68.79.59.96.02.36.573.89.68.66.8-3.17.1

us-gaap:NetIncomeLoss us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents

us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:AccumulatedDefinedBenefitPlansAdjustment


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value-4.02.03.02.02.04.03.02.03.02.02.03.02.03.01.01.00.01.00.50.60.50.70.60.60.50.60.80.70.50.70.30.50.40.4
Percentage of NetIncomeLoss-3.61.75.02.68.72.92.81.31.71.21.41.81.12.00.50.90.01.20.81.30.81.44.61.30.90.91.61.00.91.30.71.10.81.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-0.70.30.60.40.50.60.50.30.40.30.30.40.30.50.20.20.00.20.10.10.10.20.10.10.10.10.10.10.10.10.10.10.10.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome us-gaap:AccumulatedDefinedBenefitPlansAdjustment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:NetIncomeLoss us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value110120607723139107149181167147167
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax18.220.411.214.56.121.817.322.324.624.722.724.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.0

Share Based Compensation

us-gaap:ShareBasedCompensation

us-gaap:ShareBasedCompensation


Share
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value5.03.06.06.02.03.03.02.05.03.04.03.03.03.04.02.04.02.03.02.12.12.22.62.52.62.13.63.84.03.33.03.04.33.41.91.01.81.71.62.12.32.0
Percentage of ShareBasedCompensation100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Net Cash Provided By Used In Investing Activities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value-48.0-21.0-35.0-31.0-24.0-21.0-82.0-146.0-158.0-19.0-51.0-23.0-19.0-10.0-51.0-20.0-15.1-35.7-15.2-11.5-19.1-30.2-38.5-34.6-35.4-40.4-30.020-5.8
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-8.0-3.6-6.5-5.8-6.4-3.3-13.3-21.8-21.4-2.8-7.9-3.3-2.7-1.5-8.7-3.4-3.1-7.3-3.3-2.2-4.2-6.2-7.8-6.2-5.9-7.8-5.23.7-1.1

Payments To Acquire Property Plant And Equipment

us-gaap:PaymentsToAcquirePropertyPlantAndEquipment

us-gaap:PaymentsToAcquirePropertyPlantAndEquipment


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value4821353128218147251948231910.05120128.03314166.42815131.326141111331513123031263541271611
Percentage of PaymentsToAcquirePropertyPlantAndEquipment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Net Cash Provided By Used In Financing Activities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-30
Value-153.0-121.0-72.0-312.0252-203.0-81.0-65.0-251.0-83.0-171.0-90.0-290.0-149.0-127.0-71.0-105.7-69.8-190.0-19.82.1-85.2-120.2-170.3-217.8-80.6-103.1
Percentage of NetCashProvidedByUsedInFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-25.4-20.6-13.5-58.666.8-31.9-13.1-9.7-34.1-12.3-26.4-13.0-40.8-22.5-21.6-11.9-21.4-14.2-40.7-3.90.5-17.5-24.4-30.4-36.2-15.6-18.0

Payments Of Dividends

us-gaap:PaymentsOfDividends

us-gaap:PaymentsOfDividends


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-30
Value212120191920181818191920202121222323242425252526262726212121212122111110
Percentage of PaymentsOfDividends100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Payments For Repurchase Of Common Stock

us-gaap:PaymentsForRepurchaseOfCommonStock

us-gaap:PaymentsForRepurchaseOfCommonStock


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-31
Value1309629160.018062462355015386245125107239124415877659339.518179350.00.01491000.0
Percentage of PaymentsForRepurchaseOfCommonStock100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.0100.0100.00.0

Effective Income Tax Rate Continuing Operations

us-gaap:EffectiveIncomeTaxRateContinuingOperations

us-gaap:EffectiveIncomeTaxRateContinuingOperations


Effective
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-31
Value21.022.01.021.00.230.23-0.010.230.210.21-0.010.230.220.21-0.310.350.350.350.3720.3860.3690.370.3750.3680.408-0.396-0.344-0.385-0.3830.381-0.3465.580.303
Percentage of EffectiveIncomeTaxRateContinuingOperations100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Deferred Tax Liabilities

us-gaap:DeferredTaxLiabilities

us-gaap:DeferredTaxLiabilities


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-31
Value438383327273309202117
Percentage of DeferredTaxLiabilities100.0100.0100.0100.0100.0100.0100.0

Unrecognized Tax Benefits

us-gaap:UnrecognizedTaxBenefits

us-gaap:UnrecognizedTaxBenefits


Unrecognized
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-31
Value3000000.03000000.02000000.02000000.02500000.02500000.02500000.02300000.0
Percentage of UnrecognizedTaxBenefits100.0100.0100.0100.0100.0100.0100.0100.0

Deferred Tax Assets Valuation Allowance

us-gaap:DeferredTaxAssetsValuationAllowance

us-gaap:DeferredTaxAssetsValuationAllowance


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value1210.010.09.05.34.25.22.81.7390
Percentage of DeferredTaxAssetsValuationAllowance100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

alsn:ContractWithCustomerLiabilityIncrease

alsn:ContractWithCustomerLiabilityIncrease


Contract
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value9.07.0115.01311111511188.0112310.01721
Percentage of ContractWithCustomerLiabilityIncrease100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

alsn:OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAndDerivativesAdjustmentNetOfTax

alsn:OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAndDerivativesAdjustmentNetOfTax


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value1.0112.03.0-2.0-23.07.0-5.0-12.0-9.0-9.04.0
Percentage of OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAndDerivativesAdjustmentNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

alsn:OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAndDerivativesAdjustmentNetOfTax us-gaap:StatementEquityComponents

us-gaap:AccumulatedOtherComprehensiveIncome


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value1.0112.03.0-2.0-23.07.0-5.0-12.0-9.0-9.04.0
Percentage of OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAndDerivativesAdjustmentNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

alsn:PaymentsForProceedsFromBusinessAcquisitions

alsn:PaymentsForProceedsFromBusinessAcquisitions


Payments
Period End2020-12-312020-09-302019-12-312019-09-30
Value0.00.00.099
Percentage of PaymentsForProceedsFromBusinessAcquisitions0.00.00.0100.0

us-gaap:ConcentrationRiskPercentage1 us-gaap:StatementGeographical, us-gaap:ConcentrationRiskByBenchmark, us-gaap:ConcentrationRiskByType

us-gaap:ConcentrationRiskPercentage1

srt:NorthAmerica, us-gaap:SalesRevenueNet, us-gaap:GeographicConcentrationRisk


Concentration
Period End2021-03-31
Value79.0
Percentage of ConcentrationRiskPercentage1100.0

us-gaap:ContractWithCustomerLiabilityRevenueRecognized

us-gaap:ContractWithCustomerLiabilityRevenueRecognized


Contract
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value9.08.08.010.08.010.010.010.09.09.010.01210.08.08.09.0
Percentage of ContractWithCustomerLiabilityRevenueRecognized100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DebtInstrumentPeriodicPaymentPrincipal us-gaap:DebtInstrument

us-gaap:DebtInstrumentPeriodicPaymentPrincipal

alsn:NewTermLoan


Debt
Period End2021-06-302021-03-312020-12-31
Value02000000.00
Percentage of DebtInstrumentPeriodicPaymentPrincipal0.0100.00.0

us-gaap:DefinedBenefitPlanAmortizationOfPriorServiceCostCredit us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanAmortizationOfPriorServiceCostCredit

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Defined
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-312017-09-302017-06-302016-09-302016-06-30
Value-3000000.0-2000000.0-4000000.0-4000000.0-3000000.0-3000000.0-3000000.0-3000000.0-4000000.0-3000000.0-3000000.0-3000000.0-1000000.0-1000000.0-1000000.0-1000000.0-1000000.0
Percentage of DefinedBenefitPlanAmortizationOfPriorServiceCostCredit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DefinedBenefitPlanExpectedReturnOnPlanAssets us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanExpectedReturnOnPlanAssets

us-gaap:PensionPlansDefinedBenefit


Defined
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-312017-09-302017-06-302016-09-302016-06-30
Value2000000.02000000.03000000.02000000.02000000.02000000.03000000.01000000.03000000.02000000.02000000.02000000.02000000.01000000.02000000.02000000.01000000.0
Percentage of DefinedBenefitPlanExpectedReturnOnPlanAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DefinedBenefitPlanInterestCost us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanInterestCost

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Defined
Period End2021-06-302020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-312017-09-302017-06-302016-09-302016-06-30
Value1000000.01000000.01000000.001000000.01000000.01000000.01000000.01000000.01000000.01000000.01000000.02000000.01000000.01000000.02000000.0
Percentage of DefinedBenefitPlanInterestCost100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PensionPlansDefinedBenefit


Defined
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-312017-09-302017-06-302016-09-302016-06-30
Value2000000.01000000.01000000.02000000.01000000.02000000.02000000.01000000.02000000.02000000.01000000.02000000.02000000.01000000.01000000.02000000.01000000.0
Percentage of DefinedBenefitPlanInterestCost200.00.0100.0200.00.0200.0200.0100.0200.0200.0100.0200.0200.050.0100.0200.050.0

us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Defined
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-312017-09-302017-06-302016-09-302016-06-30
Value-1.0-2.0-3.0-2.0-3.0-2.0-2.0-2.0-2.0-2.0-2.0-2.01.01.01.01.02.0
Percentage of DefinedBenefitPlanNetPeriodicBenefitCost100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PensionPlansDefinedBenefit


Defined
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-312017-09-302017-06-302016-09-302016-06-30
Value2.02.03.02.02.02.02.02.02.02.02.03.03.03.02.03.03.0
Percentage of DefinedBenefitPlanNetPeriodicBenefitCost-200.0-100.0-100.0-100.0-66.7-100.0-100.0-100.0-100.0-100.0-100.0-150.0300.0300.0200.0300.0150.0

us-gaap:DefinedBenefitPlanServiceCost us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanServiceCost

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Defined
Period End2021-06-302020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-312017-09-302017-06-302016-09-302016-06-30
Value1.00.01.00.00.00.00.01.00.00.01.00.01.01.01.0
Percentage of DefinedBenefitPlanServiceCost100.00.0100.00.00.00.00.0100.00.00.0100.00.0100.0100.0100.0

us-gaap:PensionPlansDefinedBenefit


Defined
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-312017-09-302017-06-302016-09-302016-06-30
Value2.03.03.02.03.02.03.02.03.02.03.03.03.03.03.03.03.0
Percentage of DefinedBenefitPlanServiceCost200.00.00.0200.00.00.00.00.0300.00.00.00.0300.00.0300.0300.0300.0

us-gaap:Depreciation

us-gaap:Depreciation


Depreciation
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value262525252422242019181919192020212019202121202222222122232423242425242626252426252525
Percentage of Depreciation100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DividendsCommonStockCash

us-gaap:DividendsCommonStockCash


Dividends
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value212120191920181818191920
Percentage of DividendsCommonStockCash100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DividendsCommonStockCash us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings


Dividends
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value212120191920181818191920
Percentage of DividendsCommonStockCash100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EffectOfExchangeRateOnCashAndCashEquivalents

us-gaap:EffectOfExchangeRateOnCashAndCashEquivalents


Effect
Period End2021-03-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value-1.00.0-2.01.0-2.0-1.01.00.0-1.0-3.02.01.01.01.01.0-2.40.4-0.30.7-15.35.2-1.68.87.08.60.4-2.6-0.2-0.98.13.01.6-10.417-7.59.3111.5-3.9
Percentage of EffectOfExchangeRateOnCashAndCashEquivalents100.00.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:GoodwillPeriodIncreaseDecrease

us-gaap:GoodwillPeriodIncreaseDecrease


Goodwill
Period End2020-12-312020-09-302019-12-312019-09-30
Value1.01.01.021
Percentage of GoodwillPeriodIncreaseDecrease100.0100.0100.0100.0

us-gaap:GoodwillPeriodIncreaseDecrease us-gaap:BusinessAcquisition

alsn:AxleTechElectricVehicleSystemsDivision


Goodwill
Period End2020-09-30
Value0.0
Percentage of GoodwillPeriodIncreaseDecrease0.0

us-gaap:GoodwillPurchaseAccountingAdjustments

us-gaap:GoodwillPurchaseAccountingAdjustments


Goodwill
Period End2020-12-31
Value0.0
Percentage of GoodwillPurchaseAccountingAdjustments0.0

us-gaap:IncrementalCommonSharesAttributableToShareBasedPaymentArrangements

us-gaap:IncrementalCommonSharesAttributableToShareBasedPaymentArrangements


Incremental
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value01000000.01000000.01000000.0001000000.01000000.01000000.01000000.01000000.01000000.01000000.001000000.01000000.0900000.001000000.01000000.01000000.0-200000.01000000.01100000.02400000.0-400000.02100000.02800000.03700000.0-200000.03600000.04000000.03100000.0-200000.03600000.05000000.04800000.0
Percentage of IncrementalCommonSharesAttributableToShareBasedPaymentArrangements0.0100.0100.0100.00.00.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LineOfCreditFacilityIncreaseDecreaseForPeriodNet us-gaap:DebtInstrument

us-gaap:LineOfCreditFacilityIncreaseDecreaseForPeriodNet

us-gaap:RevolvingCreditFacility


Line
Period End2020-11-30
Value50
Percentage of LineOfCreditFacilityIncreaseDecreaseForPeriodNet100.0

us-gaap:OperatingLeaseExpense

us-gaap:OperatingLeaseExpense


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value2000000.01000000.02000000.01000000.02000000.01000000.01000000.01000000.02000000.01000000.0
Percentage of OperatingLeaseExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax

us-gaap:OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302014-09-302013-09-30
Value2.08.0-22.04.0-3.0-31.0-1.0-13.0-14.0-10.0-14.04.0-14.0-8.13.0
Percentage of OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax us-gaap:StatementEquityComponents

us-gaap:AccumulatedGainLossNetCashFlowHedgeParent


Other
Period End2021-06-302021-03-312020-06-302020-03-31
Value-2.014-5.0-29.0
Percentage of OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax-100.0175.0166.793.5

us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss


Other
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312014-09-302013-09-30
Value4.02.0-3.0-29.08.0-7.0-15.0-10.0-1.50.1
Percentage of OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax-18.250.0100.093.5-800.053.8107.1100.018.53.3

us-gaap:AccumulatedOtherComprehensiveIncome


Other
Period End2021-06-30
Value2.0
Percentage of OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax100.0

us-gaap:AccumulatedTranslationAdjustment


Other
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302014-09-302013-09-30
Value4.0-6.02.00.0-2.02.0-6.01.00.0-4.00.0-12.0-6.62.9
Percentage of OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax200.0-75.050.0-0.06.5-200.046.2-7.1-0.028.60.085.781.596.7

us-gaap:OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax

us-gaap:OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value2.02.0192.02.04.01.02.03.0-6.0-9.03.0
Percentage of OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax us-gaap:StatementEquityComponents

us-gaap:AccumulatedOtherComprehensiveIncome


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value2.02.0192.02.04.02.03.0-6.0-9.03.0
Percentage of OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossTax

us-gaap:OtherComprehensiveIncomeLossTax


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-30
Value-1.03.0-4.0-2.0-2.0-7.02.0-3.0-4.0-3.00.00.0-2.00.014-1.00.0-1.02.1-0.4-0.6-0.1-0.4-0.3-0.8-1.74.71.0-0.7-0.3-17.60.2
Percentage of OtherComprehensiveIncomeLossTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.0100.00.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossTax us-gaap:StatementEquityComponents

us-gaap:AccumulatedDefinedBenefitPlansAdjustment


Other
Period End2021-06-302020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302016-12-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-30
Value-1.0-6.0-1.0-1.0-1.01.0-1.0-1.0-1.02.00.0-2.00.09.00.0-1.03.0-0.3-0.4-0.3-0.3-0.4-0.30.4-0.4-0.40.2
Percentage of OtherComprehensiveIncomeLossTax100.0150.050.050.014.350.033.325.033.30.00.0100.00.064.3-0.00.0142.975.066.7300.0100.050.017.640.057.1133.3100.0

us-gaap:AccumulatedGainLossNetCashFlowHedgeParent


Other
Period End2021-06-302021-03-312020-06-302020-03-31
Value0.03.0-1.0-6.0
Percentage of OtherComprehensiveIncomeLossTax-0.0100.050.085.7

us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss


Other
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-31
Value2.0-1.0-1.0-6.01.0-2.0-3.0-2.0-2.00.05.0-1.01.0-1.0-1.0-0.1-0.20.20.0-0.4-1.40.6-0.30.1
Percentage of OtherComprehensiveIncomeLossTax-50.050.050.085.750.066.775.066.70.00.035.7100.00.0100.0-47.625.033.3-200.0-0.050.082.460.042.9-33.3

us-gaap:AccumulatedOtherComprehensiveIncome


Other
Period End2021-06-302020-06-30
Value-1.0-2.0
Percentage of OtherComprehensiveIncomeLossTax100.0100.0

us-gaap:OtherNoncashIncomeExpense

us-gaap:OtherNoncashIncomeExpense


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value-2000000.01000000.0000-3000000.0-2000000.01000000.0-1000000.01000000.03000000.0-4000000.0-1000000.0-2000000.05000000.0-2000000.0-5000000.02000000.01100000.0200000.0-1100000.0-900000.0500000.0-2800000.0-1800000.02100000.0600000.0-5600000.0-200000.00100000.0-100000.0100000.0100000.01100000.0-1100000.0400000.0-200000.00400000.0400000.0600000.0
Percentage of OtherNoncashIncomeExpense100.0100.00.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0

us-gaap:PaymentsRelatedToTaxWithholdingForShareBasedCompensation

us-gaap:PaymentsRelatedToTaxWithholdingForShareBasedCompensation


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302013-12-312013-09-30
Value03000000.00002000000.00004000000.0002000000.02000000.00001000000.01400000.000300000.01400000.000500000.07300000.0900000.00500000.0
Percentage of PaymentsRelatedToTaxWithholdingForShareBasedCompensation0.0100.00.00.00.0100.00.00.00.0100.00.00.0100.0100.00.00.00.0100.0100.00.00.0100.0100.00.00.0100.0100.0100.00.0100.0

us-gaap:ProceedsFromLongTermLinesOfCredit

us-gaap:ProceedsFromLongTermLinesOfCredit


Proceeds
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value0.00.05003000.00.0900.00.00.00.0
Percentage of ProceedsFromLongTermLinesOfCredit0.00.0100.0100.00.00.0100.00.00.00.00.0

us-gaap:ProceedsFromPreviousAcquisition us-gaap:BusinessAcquisition

us-gaap:ProceedsFromPreviousAcquisition

alsn:WalkerDieCasting


Proceeds
Period End2020-12-312020-09-302020-06-30
Value004000000.0
Percentage of ProceedsFromPreviousAcquisition0.00.0100.0

us-gaap:ProceedsFromStockOptionsExercised

us-gaap:ProceedsFromStockOptionsExercised


Proceeds
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-31
Value2.01.01.00.00.01.01.00.04.00.01.0162.03.05.03.04.07.0146.41.90.60.40.70.62125127.914128.39.41518
Percentage of ProceedsFromStockOptionsExercised100.0100.0100.00.00.0100.0100.00.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProductWarrantyAccrualPayments

us-gaap:ProductWarrantyAccrualPayments


Product
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-30
Value8.08.07.09.09.07.07.07.06.06.07.06.010.09.07.08.08.07.08.57.2108.98.57.77.98.48.07.9108.48.310109.91212138.99.68.76.9
Percentage of ProductWarrantyAccrualPayments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProductWarrantyAccrualPreexistingIncreaseDecrease

us-gaap:ProductWarrantyAccrualPreexistingIncreaseDecrease


Product
Period End2021-06-302020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-30
Value2.04.0233.01.00.0-3.0-5.0-1.0-2.0-1.01.07.08.0-2.00.0-2.0-2.73.00.52.1-0.310-0.9-4.1-0.8-0.70.31.9-0.7-11.40.52.0140.20.2-0.2-5.80.20.3
Percentage of ProductWarrantyAccrualPreexistingIncreaseDecrease100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProductWarrantyAccrualWarrantiesIssued

us-gaap:ProductWarrantyAccrualWarrantiesIssued


Product
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-30
Value4.04.04.03.03.05.05.05.06.05.08.09.0129.05.04.05.04.03.83.94.14.35.05.05.35.96.87.26.56.37.67.57.85.55.45.67.47.16.27.07.0
Percentage of ProductWarrantyAccrualWarrantiesIssued100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax

us-gaap:ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax


Reclassification
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-30
Value-4.02.03.03.05.03.04.03.03.04.03.01.01.01.00.90.91.00.90.90.91.10.91.10.7
Percentage of ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax us-gaap:StatementEquityComponents

us-gaap:AccumulatedDefinedBenefitPlansAdjustment


Reclassification
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-30
Value3.02.03.03.05.03.04.03.03.04.03.01.01.01.00.90.91.00.90.90.91.10.91.10.7
Percentage of ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax-75.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AccumulatedGainLossNetCashFlowHedgeParent


Reclassification
Period End2021-06-302020-06-30
Value-3.0-2.0
Percentage of ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax75.0-66.7

us-gaap:RepaymentsOfLongTermLinesOfCredit

us-gaap:RepaymentsOfLongTermLinesOfCredit


Repayments
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value0.02752253000.00.0900.00.00.00.0
Percentage of RepaymentsOfLongTermLinesOfCredit0.0100.0100.0100.00.00.0100.00.00.00.00.0

us-gaap:RepaymentsOfSeniorDebt

us-gaap:RepaymentsOfSeniorDebt


Repayments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-30
Value1.02.010142.01.02.02.01.00.011480.00.0253.03.03.03.03.03.012006.16.16.35.6525169796.12.852775.95.994105432.07.77.8
Percentage of RepaymentsOfSeniorDebt100.0100.0100.0100.0100.0100.0100.0100.00.0100.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StockRepurchasedAndRetiredDuringPeriodValue

us-gaap:StockRepurchasedAndRetiredDuringPeriodValue


Stock
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302016-12-312016-09-30
Value1309629160.0180624623550153868776
Percentage of StockRepurchasedAndRetiredDuringPeriodValue100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StockRepurchasedAndRetiredDuringPeriodValue us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings


Stock
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value1309629160.018062462355015386
Percentage of StockRepurchasedAndRetiredDuringPeriodValue100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StockRepurchasedDuringPeriodValue us-gaap:ShareRepurchaseProgram

us-gaap:StockRepurchasedDuringPeriodValue

alsn:StockRepurchaseProgram


Stock
Period End2021-06-30
Value130
Percentage of StockRepurchasedDuringPeriodValue100.0

alsn:TwoThousandSixteenRepurchasePlan


Stock
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302018-09-302018-06-30
Value9629160.0180624623586244
Percentage of StockRepurchasedDuringPeriodValue0.00.00.00.00.00.00.00.00.00.0

alsn:LesseeOperatingLeaseLiabilityPaymentsThereafter

alsn:LesseeOperatingLeaseLiabilityPaymentsThereafter


Lessee
Period End2021-06-302021-03-312020-09-30
Value8000000.09000000.09000000.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsThereafter100.0100.0100.0

alsn:MilitaryPriceReductionReserveCurrentAndNonCurrent

alsn:MilitaryPriceReductionReserveCurrentAndNonCurrent


Military
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value56565656555563494634
Percentage of MilitaryPriceReductionReserveCurrentAndNonCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

alsn:NonTradePayableCurrent

alsn:NonTradePayableCurrent


Non
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-31
Value2000000.02000000.02000000.02000000.01000000.02000000.02000000.03000000.04000000.04000000.03000000.03000000.03000000.04000000.08000000.04000000.0
Percentage of NonTradePayableCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

alsn:SalesAllowances

alsn:SalesAllowances


Sales
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302011-12-31
Value2618201922303230283939344031343229232429262824252823252523302623252627272832
Percentage of SalesAllowances100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

alsn:VendorBuybackObligation

alsn:VendorBuybackObligation


Vendor
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302011-12-31
Value161516151516161715151516151414131313131312111211111113121212119.89.71313161415
Percentage of VendorBuybackObligation100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

alsn:VendorLiabilityCurrent

alsn:VendorLiabilityCurrent


Vendor
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value1000000.02000000.02000000.03000000.03000000.03000000.010000000.07000000.05000000.0
Percentage of VendorLiabilityCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0

alsn:WorldwideIndependentDistributorAndDealerLocations

alsn:WorldwideIndependentDistributorAndDealerLocations


Worldwide
Period End2020-09-30
Value1500.0
Percentage of WorldwideIndependentDistributorAndDealerLocations100.0

dei:EntityNumberOfEmployees

dei:EntityNumberOfEmployees


Entity
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value3300.03700.02900.02700.02600.02700.02700.02700.02800.02800.0
Percentage of EntityNumberOfEmployees100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AllowanceForDoubtfulAccountsReceivableCurrent

us-gaap:AllowanceForDoubtfulAccountsReceivableCurrent


Allowance
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-31
Value2000000.01000000.01000000.01000000.02000000.01000000.01000000.01000000.02000000.01000000.01000000.01000000.01000000.01000000.00400000.0500000.0500000.0600000.0400000.0500000.0600000.0400000.0300000.0400000.0600000.0500000.0400000.0900000.01200000.01200000.0900000.01900000.0900000.01300000.01300000.0
Percentage of AllowanceForDoubtfulAccountsReceivableCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AociBeforeTaxAttributableToParent

us-gaap:AociBeforeTaxAttributableToParent


Aoci
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-31
Value-67.0-15.02340-20.0-17.0
Percentage of AociBeforeTaxAttributableToParent100.0100.0100.0100.0100.0100.0

us-gaap:AociBeforeTaxAttributableToParent us-gaap:DerivativeInstrumentRisk

alsn:AccumulatedOtherComprehensiveIncomeDerivativesQualifyingAsHedges


Aoci
Period End2021-06-302021-03-312020-12-312020-09-302019-12-312018-12-31
Value-45.0-46.0-60.0-64.0-34.0-9.0
Percentage of AociBeforeTaxAttributableToParent0.00.089.60.0226.7-39.1

us-gaap:AociTaxAttributableToParent

us-gaap:AociTaxAttributableToParent


Aoci
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-31
Value304553554342
Percentage of AociTaxAttributableToParent100.0100.0100.0100.0100.0100.0

us-gaap:AssetsHeldInTrust

us-gaap:AssetsHeldInTrust


Assets
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-312017-09-302017-06-302016-12-31
Value191717151412121112119.01110.08.08.08.05.0
Percentage of AssetsHeldInTrust100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AssetsHeldInTrust us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:FairValueInputsLevel1


Assets
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302016-12-31
Value191717151412121112119.01110.010.08.08.08.05.0
Percentage of AssetsHeldInTrust100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0

us-gaap:FairValueInputsLevel2


Assets
Period End2020-12-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value170.00.00.00.00.00.00.00.00.0
Percentage of AssetsHeldInTrust100.00.00.00.00.00.00.00.00.00.0

us-gaap:CashAndCashEquivalentsFairValueDisclosure

us-gaap:CashAndCashEquivalentsFairValueDisclosure


Cash
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302011-12-31
Value1101851601002450.07010.020157111502.05081411501131007610110155208126159184152227120805.03.0125
Percentage of CashAndCashEquivalentsFairValueDisclosure100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CashAndCashEquivalentsFairValueDisclosure us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:FairValueInputsLevel1


Cash
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302011-12-31
Value1101851601002450.07010.020157111502.0405081411501131007610110155208126159184152227120805.03.0125
Percentage of CashAndCashEquivalentsFairValueDisclosure100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueInputsLevel2


Cash
Period End2020-12-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value1600.00.00.00.00.00.00.00.00.0
Percentage of CashAndCashEquivalentsFairValueDisclosure100.00.00.00.00.00.00.00.00.00.0

us-gaap:ConstructionLoan

us-gaap:ConstructionLoan


Construction
Period End2020-12-312020-09-302020-06-302019-12-31
Value1000000.03000000.05000000.04000000.0
Percentage of ConstructionLoan100.0100.0100.0100.0

us-gaap:ContractWithCustomerLiability

us-gaap:ContractWithCustomerLiability


Contract
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302016-12-312015-12-31
Value142142143140145140139138133131122124125112110108969479
Percentage of ContractWithCustomerLiability100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ContractWithCustomerLiabilityNoncurrent

us-gaap:ContractWithCustomerLiabilityNoncurrent


Contract
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value1031071091071111061041039997888987727575
Percentage of ContractWithCustomerLiabilityNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ContractWithCustomerLiabilityNoncurrent us-gaap:ProductOrService

alsn:ExtendedTransmissionCoverage


Contract
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value87888889938784827774737371697270
Percentage of ContractWithCustomerLiabilityNoncurrent84.582.280.783.283.882.180.879.677.876.383.082.081.695.896.093.3

us-gaap:DebtInstrumentInterestRateEffectivePercentage us-gaap:DebtInstrument

us-gaap:DebtInstrumentInterestRateEffectivePercentage

alsn:NewTermLoan


Debt
Period End2021-06-302021-03-312020-12-312020-09-30
Value1.851.861.91.9
Percentage of DebtInstrumentInterestRateEffectivePercentage100.0100.0100.0100.0

us-gaap:DeferredCompensationCashbasedArrangementsLiabilityCurrentAndNoncurrent

us-gaap:DeferredCompensationCashbasedArrangementsLiabilityCurrentAndNoncurrent


Deferred
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-30
Value191717151412121112119.01110.08.08.08.08.05.35.45.95.64.84.54.64.52.92.82.72.41.31.00.80.70.2-0.1
Percentage of DeferredCompensationCashbasedArrangementsLiabilityCurrentAndNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredCompensationCashbasedArrangementsLiabilityCurrentAndNoncurrent us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:FairValueInputsLevel1


Deferred
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-30
Value191717151412121112119.01110.010.08.08.08.08.05.35.45.95.64.84.54.64.52.92.82.72.41.31.00.80.70.2-0.1
Percentage of DeferredCompensationCashbasedArrangementsLiabilityCurrentAndNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueInputsLevel2


Deferred
Period End2020-12-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value170.00.00.00.00.00.00.00.00.0
Percentage of DeferredCompensationCashbasedArrangementsLiabilityCurrentAndNoncurrent100.00.00.00.00.00.00.00.00.00.0

us-gaap:DeferredFinanceCostsNet

us-gaap:DeferredFinanceCostsNet


Deferred
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312014-12-31
Value242425242425262728292526282930312728282922232529
Percentage of DeferredFinanceCostsNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredFinanceCostsNet us-gaap:LongtermDebtType

alsn:FivePercentageSeniorNotesDueTwentyTwentyFour


Deferred
Period End2020-11-302016-09-30
Value1912
Percentage of DeferredFinanceCostsNet0.042.8

us-gaap:DeferredIncomeTaxLiabilities

us-gaap:DeferredIncomeTaxLiabilities


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value568505446397547478439369329260
Percentage of DeferredIncomeTaxLiabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxAssetsDeferredIncome

us-gaap:DeferredTaxAssetsDeferredIncome


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value33282425342925242422
Percentage of DeferredTaxAssetsDeferredIncome100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxAssetsGoodwillAndIntangibleAssets

us-gaap:DeferredTaxAssetsGoodwillAndIntangibleAssets


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value9.02329356471778311297
Percentage of DeferredTaxAssetsGoodwillAndIntangibleAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxAssetsGross

us-gaap:DeferredTaxAssetsGross


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value142132129133242279327355419440
Percentage of DeferredTaxAssetsGross100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxAssetsHedgingTransactions

us-gaap:DeferredTaxAssetsHedgingTransactions


Deferred
Period End2020-12-312019-12-312018-12-31
Value148.02.0
Percentage of DeferredTaxAssetsHedgingTransactions100.0100.0100.0

us-gaap:DeferredTaxAssetsInventory

us-gaap:DeferredTaxAssetsInventory


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value7000000.06000000.04000000.05000000.05700000.05400000.05100000.04600000.04000000.03700000.0
Percentage of DeferredTaxAssetsInventory100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxAssetsInvestments

us-gaap:DeferredTaxAssetsInvestments


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-31
Value4.05.05.04.09.4106.66.84.4
Percentage of DeferredTaxAssetsInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxAssetsOperatingLossCarryforwards

us-gaap:DeferredTaxAssetsOperatingLossCarryforwards


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value6.08.010.0121348107140145158
Percentage of DeferredTaxAssetsOperatingLossCarryforwards100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxAssetsOther

us-gaap:DeferredTaxAssetsOther


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value137.02.04.09.11316101313
Percentage of DeferredTaxAssetsOther100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxAssetsTaxCreditCarryforwards

us-gaap:DeferredTaxAssetsTaxCreditCarryforwards


Deferred
Period End2020-12-312018-12-312017-12-312016-12-312015-12-312014-12-31
Value4000000.01000000.007700000.06200000.03100000.0
Percentage of DeferredTaxAssetsTaxCreditCarryforwards100.0100.00.0100.0100.0100.0

us-gaap:DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost

us-gaap:DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value9.07.05.06.07.87.46.9121012
Percentage of DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities

us-gaap:DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value26232018332432272230
Percentage of DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsReturnsAndAllowances

us-gaap:DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsReturnsAndAllowances


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value3000000.06000000.08000000.06000000.06500000.06800000.06700000.07900000.08000000.09900000.0
Percentage of DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsReturnsAndAllowances100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsWarrantyReserves

us-gaap:DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsWarrantyReserves


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value14111411222630323938
Percentage of DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsWarrantyReserves100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsGoodwill

us-gaap:DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsGoodwill


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value373337311287408365320280261211
Percentage of DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsGoodwill100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets

us-gaap:DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-31
Value153132114961219190
Percentage of DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxLiabilitiesOther

us-gaap:DeferredTaxLiabilitiesOther


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312012-12-312011-12-31
Value2000000.02000000.02000000.03000000.02200000.03000000.02800000.03100000.06200000.0
Percentage of DeferredTaxLiabilitiesOther100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxLiabilitiesPropertyPlantAndEquipment

us-gaap:DeferredTaxLiabilitiesPropertyPlantAndEquipment


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value402810.07.0141920222525
Percentage of DeferredTaxLiabilitiesPropertyPlantAndEquipment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxLiabilitiesUndistributedForeignEarnings

us-gaap:DeferredTaxLiabilitiesUndistributedForeignEarnings


Deferred
Period End2020-12-31
Value3000000.0
Percentage of DeferredTaxLiabilitiesUndistributedForeignEarnings100.0

us-gaap:DefinedBenefitPlanAccumulatedBenefitObligation

us-gaap:DefinedBenefitPlanAccumulatedBenefitObligation


Defined
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value23519917317715113612910310096
Percentage of DefinedBenefitPlanAccumulatedBenefitObligation100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-31
Value-36.0-61.0-73.0
Percentage of DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax100.0100.0100.0

us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-31
Value143.05.0
Percentage of DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax-38.9-4.9-6.8

us-gaap:DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-31
Value-8.04.02.0
Percentage of DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax100.0100.0100.0

us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-31
Value-16.0-6.0-8.0
Percentage of DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax200.0-150.0-400.0

us-gaap:DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-31
Value-44.0-57.0-71.0
Percentage of DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax100.0100.0100.0

us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-31
Value-2.0-3.0-3.0
Percentage of DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax4.55.34.2

us-gaap:DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-31
Value2.40.0320.042
Percentage of DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate100.0100.0100.0

us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-31
Value2.30.0320.042
Percentage of DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate95.8100.0100.0

us-gaap:DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncrease us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncrease

us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-31
Value3.00.030.03
Percentage of DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncrease100.0100.0100.0

us-gaap:DefinedBenefitPlanBenefitObligation us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanBenefitObligation

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-31
Value107949310214493
Percentage of DefinedBenefitPlanBenefitObligation100.0100.0100.0100.0100.0100.0

us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value235204177181155
Percentage of DefinedBenefitPlanBenefitObligation219.6217.0190.3177.5107.6

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Defined
Period End2020-12-312019-12-31
Value2322
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter100.0100.0

us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312019-12-31
Value6867
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter295.7304.5

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths

us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312019-12-31
Value1110.0
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths100.0100.0

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour

us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312019-12-31
Value1213
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour100.0100.0

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Defined
Period End2020-12-312019-12-31
Value4.03.0
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo100.0100.0

us-gaap:DefinedBenefitPlanFairValueOfPlanAssets us-gaap:DefinedBenefitPlanByPlanAssetCategories, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanFairValueOfPlanAssets

us-gaap:DefinedBenefitPlanCashAndCashEquivalents, us-gaap:FairValueInputsLevel1, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-31
Value4.06.03.0
Percentage of DefinedBenefitPlanFairValueOfPlanAssets100.0100.0100.0

us-gaap:DefinedBenefitPlanDebtSecurity, us-gaap:FairValueInputsLevel1, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-31
Value14139.0
Percentage of DefinedBenefitPlanFairValueOfPlanAssets350.0216.7300.0

us-gaap:DefinedBenefitPlanDebtSecurity, us-gaap:FairValueInputsLevel2, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-31
Value172164156
Percentage of DefinedBenefitPlanFairValueOfPlanAssets4300.02733.35200.0

us-gaap:DefinedBenefitPlanEquitySecurities, us-gaap:FairValueInputsLevel1, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-31
Value282420
Percentage of DefinedBenefitPlanFairValueOfPlanAssets700.0400.0666.7

us-gaap:DefinedBenefitPlanEquitySecurities, us-gaap:FairValueInputsLevel2, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-31
Value10.010.08.0
Percentage of DefinedBenefitPlanFairValueOfPlanAssets250.0166.7266.7

us-gaap:DefinedBenefitPlanFairValueOfPlanAssets us-gaap:DefinedBenefitPlanByPlanAssetCategories, us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanCashAndCashEquivalents, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-31
Value4.06.03.0
Percentage of DefinedBenefitPlanFairValueOfPlanAssets100.0100.0100.0

us-gaap:DefinedBenefitPlanDebtSecurity, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-31
Value186177165
Percentage of DefinedBenefitPlanFairValueOfPlanAssets4650.02950.05500.0

us-gaap:DefinedBenefitPlanEquitySecurities, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-31
Value383428
Percentage of DefinedBenefitPlanFairValueOfPlanAssets950.0566.7933.3

us-gaap:DefinedBenefitPlanFairValueOfPlanAssets us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:RetirementPlanType

us-gaap:FairValueInputsLevel1, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-31
Value464332
Percentage of DefinedBenefitPlanFairValueOfPlanAssets1150.0716.71066.7

us-gaap:FairValueInputsLevel2, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-31
Value182174164
Percentage of DefinedBenefitPlanFairValueOfPlanAssets4550.02900.05466.7

us-gaap:DefinedBenefitPlanFairValueOfPlanAssets us-gaap:RetirementPlanType

us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value228217196188150
Percentage of DefinedBenefitPlanFairValueOfPlanAssets5700.03616.76533.30.00.0

us-gaap:DefinedBenefitPlanFundedStatusOfPlan us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanFundedStatusOfPlan

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-31
Value-107.0-94.0-93.0-102.0
Percentage of DefinedBenefitPlanFundedStatusOfPlan100.0100.0100.0100.0

us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-31
Value-7.013197.0
Percentage of DefinedBenefitPlanFundedStatusOfPlan6.5-13.8-20.4-6.9

us-gaap:DefinedBenefitPlanPensionPlanWithProjectedBenefitObligationInExcessOfPlanAssetsPlanAssets us-gaap:RetirementPlanName

us-gaap:DefinedBenefitPlanPensionPlanWithProjectedBenefitObligationInExcessOfPlanAssetsPlanAssets

alsn:SalariedDefinedBenefitPlan


Defined
Period End2020-12-31
Value112
Percentage of DefinedBenefitPlanPensionPlanWithProjectedBenefitObligationInExcessOfPlanAssetsPlanAssets100.0

us-gaap:DefinedBenefitPlanPensionPlanWithProjectedBenefitObligationInExcessOfPlanAssetsProjectedBenefitObligation us-gaap:RetirementPlanName

us-gaap:DefinedBenefitPlanPensionPlanWithProjectedBenefitObligationInExcessOfPlanAssetsProjectedBenefitObligation

alsn:SalariedDefinedBenefitPlan


Defined
Period End2020-12-31
Value119
Percentage of DefinedBenefitPlanPensionPlanWithProjectedBenefitObligationInExcessOfPlanAssetsProjectedBenefitObligation100.0

us-gaap:DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateAccumulatedBenefitObligation us-gaap:RetirementPlanName

us-gaap:DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateAccumulatedBenefitObligation

alsn:SalariedDefinedBenefitPlan


Defined
Period End2020-12-31
Value119
Percentage of DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateAccumulatedBenefitObligation100.0

us-gaap:DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateFairValueOfPlanAssets us-gaap:RetirementPlanName

us-gaap:DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateFairValueOfPlanAssets

alsn:SalariedDefinedBenefitPlan


Defined
Period End2020-12-31
Value112
Percentage of DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateFairValueOfPlanAssets100.0

us-gaap:DefinedBenefitPlanPlanAssetsTargetAllocationPercentage us-gaap:DefinedBenefitPlanByPlanAssetCategories, us-gaap:RetirementPlanName

us-gaap:DefinedBenefitPlanPlanAssetsTargetAllocationPercentage

us-gaap:DefinedBenefitPlanCashAndCashEquivalents, alsn:HourlyDefinedBenefitPensionPlan


Defined
Period End2020-12-312019-12-31
Value2.00.02
Percentage of DefinedBenefitPlanPlanAssetsTargetAllocationPercentage100.0100.0

us-gaap:DefinedBenefitPlanCashAndCashEquivalents, alsn:SalariedDefinedBenefitPlan


Defined
Period End2020-12-312019-12-31
Value2.00.02
Percentage of DefinedBenefitPlanPlanAssetsTargetAllocationPercentage100.0100.0

us-gaap:DefinedBenefitPlanDebtSecurity, alsn:HourlyDefinedBenefitPensionPlan


Defined
Period End2020-12-312019-12-31
Value83.00.83
Percentage of DefinedBenefitPlanPlanAssetsTargetAllocationPercentage4150.04150.0

us-gaap:DefinedBenefitPlanDebtSecurity, alsn:SalariedDefinedBenefitPlan


Defined
Period End2020-12-312019-12-31
Value83.00.83
Percentage of DefinedBenefitPlanPlanAssetsTargetAllocationPercentage4150.04150.0

us-gaap:DefinedBenefitPlanEquitySecurities, alsn:HourlyDefinedBenefitPensionPlan


Defined
Period End2020-12-312019-12-31
Value15.00.15
Percentage of DefinedBenefitPlanPlanAssetsTargetAllocationPercentage750.0750.0

us-gaap:DefinedBenefitPlanEquitySecurities, alsn:SalariedDefinedBenefitPlan


Defined
Period End2020-12-312019-12-31
Value15.00.15
Percentage of DefinedBenefitPlanPlanAssetsTargetAllocationPercentage750.0750.0

us-gaap:DerivativeFairValueOfDerivativeLiability us-gaap:BalanceSheetLocation, us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation

us-gaap:DerivativeFairValueOfDerivativeLiability

us-gaap:OtherCurrentLiabilities, us-gaap:InterestRateSwap, us-gaap:DesignatedAsHedgingInstrument


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-31
Value131314141412-7.07.05.0-2.0-1.00.0
Percentage of DerivativeFairValueOfDerivativeLiability100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0

us-gaap:OtherNoncurrentLiabilities, us-gaap:InterestRateSwap, us-gaap:DesignatedAsHedgingInstrument


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-31
Value323346505251-27.03429-17.0-8.00.0
Percentage of DerivativeFairValueOfDerivativeLiability246.2253.8328.6357.1371.4425.0385.7485.7580.0850.0800.00.0

us-gaap:DerivativeFairValueOfDerivativeNet us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation

us-gaap:DerivativeFairValueOfDerivativeNet

us-gaap:InterestRateSwap, us-gaap:DesignatedAsHedgingInstrument


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-31
Value454660646663-34.04134-19.0-9.00.0
Percentage of DerivativeFairValueOfDerivativeNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0

us-gaap:DerivativeLiabilities us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:HedgingDesignation

us-gaap:DerivativeLiabilities

us-gaap:FairValueInputsLevel1, us-gaap:DesignatedAsHedgingInstrument


Derivative
Period End2020-12-312020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value600.00.00.00.00.00.0
Percentage of DerivativeLiabilities100.00.00.00.00.00.00.0

us-gaap:FairValueInputsLevel2, us-gaap:DesignatedAsHedgingInstrument


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value4546606466633441349.0
Percentage of DerivativeLiabilities0.00.0100.00.00.00.00.00.00.00.0

us-gaap:DerivativeLiabilities us-gaap:HedgingDesignation

us-gaap:DesignatedAsHedgingInstrument


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value4546606466633441349.0
Percentage of DerivativeLiabilities0.00.0100.00.00.00.00.00.00.00.0

us-gaap:DerivativeLiabilitiesCurrent

us-gaap:DerivativeLiabilitiesCurrent


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312011-12-31
Value1313141414127.07.05.03.01.00.01111111114139.65.02.70.20.40.80.43.512202733343431
Percentage of DerivativeLiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EmployeeRelatedLiabilitiesCurrent

us-gaap:EmployeeRelatedLiabilitiesCurrent


Employee
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302011-12-31
Value7053473642298776623581655229736754315235322031303023504840273735332347393549
Percentage of EmployeeRelatedLiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueNetAssetLiability

us-gaap:FairValueNetAssetLiability


Fair
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302013-12-31
Value6513916036179-63.036-31.0-14.01381025250-19.0-22.0-23.0544.0109767248828248210173
Percentage of FairValueNetAssetLiability100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueNetAssetLiability us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:FairValueInputsLevel1


Fair
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302013-12-31
Value110185-60.01002450.07010.020157111502.040501.01.082441531171028110410563217192
Percentage of FairValueNetAssetLiability169.2133.1-37.5277.8136.9-0.0194.4-32.3-142.9113.8108.896.20.00.0100.0-4.5-4.3153.01100.0139.6152.5141.3167.6127.5128.9132.0103.3111.4

us-gaap:FairValueInputsLevel2


Fair
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302013-12-31
Value-45.0-46.0100-64.0-66.0-63.0-34.0-41.0-34.0-19.0-9.02.0-2.00.0-19.0-23.0-24.0-28.7-40.0-43.4-40.3-30.1-32.9-22.6-23.7-15.4-7.0-19.8
Percentage of FairValueNetAssetLiability-69.2-33.162.5-177.8-36.9100.0-94.4132.3242.9-13.8-8.83.80.00.0100.0104.5104.3-53.0-1000.0-39.6-52.5-41.3-67.6-27.5-28.9-32.0-3.3-11.4

us-gaap:FiniteLivedIntangibleAssetsAccumulatedAmortization

us-gaap:FiniteLivedIntangibleAssetsAccumulatedAmortization


Finite
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302011-12-31
Value125512441232122012091197118111601137111611441123110110791057103510139901228944921898113611111087106310391014989964940915889864834797759684
Percentage of FiniteLivedIntangibleAssetsAccumulatedAmortization100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FiniteLivedIntangibleAssetsAccumulatedAmortization us-gaap:FiniteLivedIntangibleAssetsByMajorClass

alsn:CustomerRelationshipsCommercial


Finite
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-31
Value729719708697686675664653641630619608597585573562550538526513501489477464452439426413400387374361348334321
Percentage of FiniteLivedIntangibleAssetsAccumulatedAmortization58.157.857.557.156.756.456.256.356.456.554.154.154.254.254.254.354.354.342.854.454.454.542.041.841.641.341.140.840.540.239.939.539.138.738.5

alsn:CustomerRelationshipsDefense


Finite
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-31
Value4948474746454444424241403938383736353433333231302928272726252423222120
Percentage of FiniteLivedIntangibleAssetsAccumulatedAmortization3.93.93.83.93.83.83.73.83.73.83.63.63.53.53.63.63.63.52.83.63.63.62.82.72.72.72.72.72.62.62.62.62.52.52.5

alsn:ProprietaryTechnology


Finite
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-31
Value477477477476477477473463454444434425415406396386377368358348339329320310301291282272262253243234224215205
Percentage of FiniteLivedIntangibleAssetsAccumulatedAmortization38.038.338.739.039.539.840.139.939.939.837.937.837.737.637.537.337.237.229.236.936.836.728.227.927.727.427.126.926.626.325.925.625.324.924.6

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths


Finite
Period End2021-06-302021-03-312020-12-312020-09-30
Value45454646
Percentage of FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths100.0100.0100.0100.0

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearFive

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearFive


Finite
Period End2021-06-302021-03-312020-12-312020-09-30
Value1000000.01000000.04000000.04000000.0
Percentage of FiniteLivedIntangibleAssetsAmortizationExpenseYearFive100.0100.0100.0100.0

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearFour

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearFour


Finite
Period End2021-06-302021-03-312020-12-312020-09-30
Value4000000.04000000.08000000.08000000.0
Percentage of FiniteLivedIntangibleAssetsAmortizationExpenseYearFour100.0100.0100.0100.0

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearThree

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearThree


Finite
Period End2021-06-302021-03-312020-12-312020-09-30
Value8.08.04343
Percentage of FiniteLivedIntangibleAssetsAmortizationExpenseYearThree100.0100.0100.0100.0

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo


Finite
Period End2021-06-302021-03-312020-12-312020-09-30
Value43434545
Percentage of FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo100.0100.0100.0100.0

us-gaap:FiniteLivedIntangibleAssetsGross us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:FiniteLivedIntangibleAssetsGross

alsn:CustomerRelationshipsCommercial


Finite
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-31
Value839839839839839839839839835832832832832832832832832832831831831831831831831831831831831831831831831831831
Percentage of FiniteLivedIntangibleAssetsGross100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

alsn:CustomerRelationshipsDefense


Finite
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-31
Value6262626262626262626262626262626262626262626262626262626262626262626262
Percentage of FiniteLivedIntangibleAssetsGross7.47.47.47.47.47.47.47.47.47.57.57.57.57.57.57.57.57.57.57.57.57.57.57.57.57.57.57.57.57.57.57.57.57.57.5

alsn:ProprietaryTechnology


Finite
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-31
Value478478478478478481481479479476476476476476476476476476476476476476476476476476476476476476476476476476476
Percentage of FiniteLivedIntangibleAssetsGross57.057.057.057.057.057.357.357.157.457.257.257.257.257.257.257.257.257.257.357.357.357.357.357.357.357.357.357.357.357.357.357.357.357.357.3

us-gaap:IntangibleAssetsGrossExcludingGoodwill

us-gaap:IntangibleAssetsGrossExcludingGoodwill


Intangible
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302012-12-31
Value2195219521952195219522232223222122162160221022102210221022102210221022102471221022102210247125512551255125512551255125512551255125512551
Percentage of IntangibleAssetsGrossExcludingGoodwill100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InterestPayableCurrent

us-gaap:InterestPayableCurrent


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302011-12-31
Value313412452145215128351936183619281630164.50.70.60.60.60.8135.21316181120152414191219
Percentage of InterestPayableCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InventoryFinishedGoodsNetOfReserves

us-gaap:InventoryFinishedGoodsNetOfReserves


Inventory
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-31
Value6147242236303136313032313232233028272030312421342723182629432929302324
Percentage of InventoryFinishedGoodsNetOfReserves100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InventoryPartsAndComponentsNetOfReserves

us-gaap:InventoryPartsAndComponentsNetOfReserves


Inventory
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-31
Value95911019790103911009510082828384797266655771666669697484728486827982799180
Percentage of InventoryPartsAndComponentsNetOfReserves100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InventoryWorkInProcessNetOfReserves

us-gaap:InventoryWorkInProcessNetOfReserves


Inventory
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-31
Value12141513202217179.09.08.08.010.08.06.08.07.08.04.57.17.25.85.15.86.06.06.16.18.06.85.78.08.19.87.5
Percentage of InventoryWorkInProcessNetOfReserves100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InvestmentsInAndAdvancesToAffiliatesAtFairValue us-gaap:ConsolidatedEntities

us-gaap:InvestmentsInAndAdvancesToAffiliatesAtFairValue

srt:ParentCompany


Investments
Period End2020-12-312019-12-312018-12-31
Value756781659
Percentage of InvestmentsInAndAdvancesToAffiliatesAtFairValue100.0100.0100.0

us-gaap:LesseeOperatingLeaseDiscountRate

us-gaap:LesseeOperatingLeaseDiscountRate


Lessee
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-31
Value4.364.374.374.370.04360.04360.0436
Percentage of LesseeOperatingLeaseDiscountRate100.0100.0100.0100.0100.0100.0100.0

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths


Lessee
Period End2021-06-302021-03-312020-12-312020-09-30
Value5000000.04000000.05000000.05000000.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths100.0100.0100.0100.0

us-gaap:LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear

us-gaap:LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear


Lessee
Period End2021-06-302021-03-312020-09-30
Value3000000.04000000.01000000.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear100.0100.0100.0

us-gaap:LineOfCreditFacilityMaximumBorrowingCapacity us-gaap:CreditFacility, us-gaap:DebtInstrument

us-gaap:LineOfCreditFacilityMaximumBorrowingCapacity

us-gaap:LetterOfCredit, us-gaap:RevolvingCreditFacility


Line
Period End2021-06-30
Value75
Percentage of LineOfCreditFacilityMaximumBorrowingCapacity100.0

us-gaap:LineOfCreditFacilityMaximumBorrowingCapacity us-gaap:DebtInstrument

alsn:NewRevolvingCreditFacility


Line
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value650650600600600600600
Percentage of LineOfCreditFacilityMaximumBorrowingCapacity0.00.00.00.00.00.00.0

us-gaap:LineOfCreditFacilityRemainingBorrowingCapacity us-gaap:CreditFacility, us-gaap:DebtInstrument

us-gaap:LineOfCreditFacilityRemainingBorrowingCapacity

us-gaap:LetterOfCredit, alsn:NewRevolvingCreditFacility


Line
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value5.05.05.06.05.05.017
Percentage of LineOfCreditFacilityRemainingBorrowingCapacity100.0100.0100.0100.0100.0100.0100.0

us-gaap:LetterOfCredit, us-gaap:RevolvingCreditFacility


Line
Period End2021-06-30
Value5.0
Percentage of LineOfCreditFacilityRemainingBorrowingCapacity0.0

us-gaap:LineOfCreditFacilityRemainingBorrowingCapacity us-gaap:DebtInstrument

alsn:NewRevolvingCreditFacility


Line
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value645645595319595595583
Percentage of LineOfCreditFacilityRemainingBorrowingCapacity12900.012900.011900.05316.711900.011900.03429.4

us-gaap:RevolvingCreditFacility


Line
Period End2021-06-30
Value645
Percentage of LineOfCreditFacilityRemainingBorrowingCapacity0.0

us-gaap:LongTermDebtFairValue

us-gaap:LongTermDebtFairValue


Long
Period End2021-06-302021-03-312020-12-312020-09-30
Value2592258026352599
Percentage of LongTermDebtFairValue100.0100.0100.0100.0

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths


Long
Period End2020-12-31
Value6000000.0
Percentage of LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths100.0

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive


Long
Period End2020-12-31
Value6000000.0
Percentage of LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive100.0

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour


Long
Period End2020-12-31
Value6000000.0
Percentage of LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour100.0

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree


Long
Period End2020-12-31
Value6000000.0
Percentage of LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree100.0

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo


Long
Period End2020-12-31
Value6000000.0
Percentage of LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo100.0

us-gaap:OtherInventoryNetOfReserves

us-gaap:OtherInventoryNetOfReserves


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-31
Value3841414555526056535048454548464646444347454645454847464445424545454344
Percentage of OtherInventoryNetOfReserves100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherSundryLiabilitiesCurrent

us-gaap:OtherSundryLiabilitiesCurrent


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value1513121211171715181320139.015161413131214121210
Percentage of OtherSundryLiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProductWarrantyAccrual

us-gaap:ProductWarrantyAccrual


Product
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value6062666548515254596466676562554955586270707578817377838586909091105107109106111113115114120125128175
Percentage of ProductWarrantyAccrual100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProductWarrantyAccrualClassifiedCurrent

us-gaap:ProductWarrantyAccrualClassifiedCurrent


Product
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-30
Value2932363429252425272726262824222221222428282724252123242323323738353536333332333032
Percentage of ProductWarrantyAccrualClassifiedCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProductWarrantyAccrualNoncurrent

us-gaap:ProductWarrantyAccrualNoncurrent


Product
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-30
Value3130303119262829323740413738332734363742424853565253596263585353697173737781818488
Percentage of ProductWarrantyAccrualNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1 us-gaap:ShareRepurchaseProgram

us-gaap:StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1

alsn:StockRepurchaseProgram


Stock
Period End2021-06-30
Value601
Percentage of StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1100.0

alsn:TwoThousandSixteenRepurchasePlan


Stock
Period End2021-03-312020-12-312020-09-30
Value731827856
Percentage of StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount10.00.00.0

Line plots across dimensions of each concept


TTM Greenblatt ROC
_
(None,)
T T M  Greenblatt  R O C_
us-gaap:OtherComprehensiveIncomeLossNetOfTax
us-gaap:StatementEquityComponents
(None,)
Other Comprehensive Income Loss Net Of Taxus-gaap: Statement Equity Components
us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax
us-gaap:ProductOrService
(None,)
Revenue From Contract With Customer Excluding Assessed Taxus-gaap: Product Or Service
us-gaap:StockholdersEquity
us-gaap:StatementEquityComponents
(None,)
Stockholders Equityus-gaap: Statement Equity Components
us-gaap:PropertyPlantAndEquipmentGross
us-gaap:PropertyPlantAndEquipmentByType
(None,)
Property Plant And Equipment Grossus-gaap: Property Plant And Equipment By Type
us-gaap:PropertyPlantAndEquipmentNet
us-gaap:StatementGeographical
(None,)
Property Plant And Equipment Netus-gaap: Statement Geographical
us-gaap:IndefiniteLivedIntangibleAssetsExcludingGoodwill
us-gaap:IndefiniteLivedIntangibleAssetsByMajorClass
(None,)
Indefinite Lived Intangible Assets Excluding Goodwillus-gaap: Indefinite Lived Intangible Assets By Major Class
us-gaap:FiniteLivedIntangibleAssetsNet
us-gaap:FiniteLivedIntangibleAssetsByMajorClass
(None,)
Finite Lived Intangible Assets Netus-gaap: Finite Lived Intangible Assets By Major Class
us-gaap:LongTermDebt
us-gaap:DebtInstrument
(None,)
Long Term Debtus-gaap: Debt Instrument
us-gaap:PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent
us-gaap:RetirementPlanType
(None,)
Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrentus-gaap: Retirement Plan Type
us-gaap:StockholdersEquity
us-gaap:StatementEquityComponents
(None,)
Stockholders Equityus-gaap: Statement Equity Components