AWI


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

Table of contents



us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic

us-gaap:EarningsPerShareBasic

us-gaap:EarningsPerShareDiluted

us-gaap:IncomeLossFromContinuingOperationsPerBasicShare

us-gaap:IncomeLossFromContinuingOperationsPerDilutedShare

us-gaap:ComprehensiveIncomeNetOfTax

us-gaap:CostOfGoodsAndServicesSold

us-gaap:GrossProfit
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, us-gaap:EquityMethodInvestmentNonconsolidatedInvestee

us-gaap:IncomeLossFromContinuingOperations
us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
us-gaap:BusinessAcquisition

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

us-gaap:IncomeTaxesPaidNet

us-gaap:InterestExpense
us-gaap:DerivativeInstrumentRisk, us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents

us-gaap:InterestPaidNet

us-gaap:NetIncomeLoss
us-gaap:BusinessAcquisition
us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, us-gaap:EquityMethodInvestmentNonconsolidatedInvestee
us-gaap:StatementEquityComponents

us-gaap:NonoperatingIncomeExpense

us-gaap:OperatingIncomeLoss
us-gaap:ConsolidationItems
us-gaap:StatementBusinessSegments

us-gaap:OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax

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

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax
us-gaap:BusinessAcquisition
us-gaap:MajorCustomers, us-gaap:StatementBusinessSegments
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, us-gaap:EquityMethodInvestmentNonconsolidatedInvestee
us-gaap:StatementBusinessSegments

us-gaap:SellingGeneralAndAdministrativeExpense

us-gaap:Assets
us-gaap:ConsolidationItems
us-gaap:StatementBusinessSegments

us-gaap:LiabilitiesAndStockholdersEquity

us-gaap:StockholdersEquity
us-gaap:StatementEquityComponents

us-gaap:AssetsCurrent
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, us-gaap:EquityMethodInvestmentNonconsolidatedInvestee

us-gaap:CashAndCashEquivalentsAtCarryingValue

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents

us-gaap:ReceivablesNetCurrent

us-gaap:InventoryNet

us-gaap:InventoryFinishedGoods

us-gaap:InventoryLIFOReserve

us-gaap:InventoryRawMaterialsAndSupplies

us-gaap:OtherAssetsCurrent

us-gaap:Land

us-gaap:MachineryAndEquipmentGross
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, us-gaap:EquityMethodInvestmentNonconsolidatedInvestee
us-gaap:AssetsNoncurrent

us-gaap:ConstructionInProgressGross

us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment

us-gaap:AmortizationOfIntangibleAssets

us-gaap:PropertyPlantAndEquipmentNet
us-gaap:StatementBusinessSegments
us-gaap:StatementGeographical, us-gaap:StatementBusinessSegments

us-gaap:InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
us-gaap:StatementBusinessSegments

us-gaap:Goodwill
us-gaap:BusinessAcquisition

us-gaap:IndefiniteLivedIntangibleAssetsExcludingGoodwill
us-gaap:IndefiniteLivedIntangibleAssetsByMajorClass

us-gaap:IntangibleAssetsNetExcludingGoodwill

us-gaap:OperatingLeaseRightOfUseAsset

us-gaap:OtherAssetsNoncurrent

us-gaap:AccountsPayableAndAccruedLiabilitiesCurrent

us-gaap:AccruedIncomeTaxesCurrent

us-gaap:LiabilitiesCurrent
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, us-gaap:EquityMethodInvestmentNonconsolidatedInvestee

us-gaap:LongTermDebtCurrent
us-gaap:ExtinguishmentOfDebt

us-gaap:OperatingLeaseLiabilityCurrent

us-gaap:LiabilitiesNoncurrent
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, us-gaap:EquityMethodInvestmentNonconsolidatedInvestee
us-gaap:ExtinguishmentOfDebt
us-gaap:LongTermDebt

us-gaap:LongTermDebtNoncurrent
us-gaap:ExtinguishmentOfDebt

us-gaap:DeferredIncomeTaxLiabilitiesNet

us-gaap:OtherLiabilitiesNoncurrent

us-gaap:OperatingLeaseLiabilityNoncurrent

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive

us-gaap:OperatingLeaseLiability

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue

us-gaap:LesseeOperatingLeaseLiabilityUndiscountedExcessAmount

us-gaap:StockholdersEquity
us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapitalCommonStock

us-gaap:RetainedEarningsAccumulatedDeficit

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect

us-gaap:DepreciationDepletionAndAmortization

us-gaap:IncreaseDecreaseInInventories

us-gaap:IncreaseDecreaseInOtherOperatingCapitalNet

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetIncomeLoss
us-gaap:BusinessAcquisition
us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, us-gaap:EquityMethodInvestmentNonconsolidatedInvestee
us-gaap:StatementEquityComponents

us-gaap:ShareBasedCompensation

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:PaymentsToAcquireProductiveAssets

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:RepaymentsOfLongTermDebt

us-gaap:PaymentsOfDividends

us-gaap:PaymentsForRepurchaseOfCommonStock

us-gaap:EffectiveIncomeTaxRateContinuingOperations

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice

us-gaap:DeferredTaxLiabilities

us-gaap:DeferredTaxAssetsNet

us-gaap:UnrecognizedTaxBenefits

us-gaap:DeferredTaxAssetsValuationAllowance
us-gaap:IncomeTaxAuthority
us-gaap:IncomeTaxAuthority, us-gaap:TaxCreditCarryforward

awi:AdjustmentsToAPICShareBasedCompensationRequisiteServicePeriodRecognitionValueWithAdjustmentsRelatedToTaxWithholdingForShareBasedCompensation
us-gaap:StatementEquityComponents
us-gaap:TitleOfIndividual, us-gaap:BusinessAcquisition
awi:BusinessAcquisitionAdditionalCashPayments

awi:BusinessAcquisitionsProFormaIncomeLossFromContinuingOperationsBeforeIncomeTaxes
us-gaap:Range, us-gaap:BusinessAcquisition
awi:BusinessCombinationAdditionalContingentConsiderationPayable
us-gaap:AwardType, us-gaap:BusinessAcquisition
awi:BusinessCombinationContingentConsiderationAnnualGrowthRate
us-gaap:BusinessAcquisition, us-gaap:SubsequentEventType
us-gaap:Range, us-gaap:BusinessAcquisition, us-gaap:SubsequentEventType
us-gaap:AwardType, us-gaap:BusinessAcquisition
awi:BusinessCombinationContingentConsiderationArrangements
us-gaap:BusinessAcquisition, us-gaap:SubsequentEventType
us-gaap:Range, us-gaap:AwardType, us-gaap:BusinessAcquisition
us-gaap:Range, us-gaap:BusinessAcquisition, us-gaap:SubsequentEventType
dei:LegalEntity
awi:DisposalGroupIncludingDiscontinuedOperationWorkingCapitalAdjustmentToCashConsiderationPayable

awi:DomesticPensionCreditExpense

awi:EarningsAllocatedToParticipatingVestedBasicAndDilutedShare
us-gaap:BusinessAcquisition, us-gaap:MeasurementInputType
awi:FairValueWeightedAverageUnobservableInputsPercentage
dei:LegalEntity, us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations
awi:LossOnSaleToKnauf

awi:NetIncomeLossFromContinuingOperationsAvailableToCommonStockholders

awi:PaymentMadeToInvestmentInJointVentureFromProceedsFromSaleOfBusiness
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

awi:PaymentsForFinanceLeases

awi:ProceedsPaymentsFromShareBasedCompensationPlansNetOfTax

awi:ValuationLossOnPensionLiabilities
us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations

us-gaap:AccrualForEnvironmentalLossContingenciesPeriodIncreaseDecrease

us-gaap:BusinessAcquisitionsProFormaNetIncomeLoss

us-gaap:BusinessAcquisitionsProFormaRevenue
us-gaap:BusinessAcquisition
us-gaap:BusinessCombinationConsiderationTransferred1

us-gaap:BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1

us-gaap:CapitalExpendituresIncurredButNotYetPaid
us-gaap:BusinessAcquisition
us-gaap:CashAcquiredFromAcquisition

us-gaap:CommonStockDividendsPerShareDeclared
us-gaap:SubsequentEventType
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAmortizationOfGainsLosses
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAmortizationOfPriorServiceCostCredit
us-gaap:RetirementPlanName
us-gaap:DefinedBenefitPlanCostOfProvidingSpecialOrContractualTerminationBenefitRecognizedDuringPeriod
us-gaap:RetirementPlanType
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanExpectedReturnOnPlanAssets
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanInterestCost
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanServiceCost

us-gaap:DerivativeInstrumentsGainLossReclassificationFromAccumulatedOCIToIncomeEstimatedNetAmountToBeTransferred
us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:IncomeStatementLocation
us-gaap:DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet
us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship

us-gaap:DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax
us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations

us-gaap:DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax
us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations

us-gaap:DiscontinuedOperationTaxEffectOfIncomeLossFromDisposalOfDiscontinuedOperation
us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations

us-gaap:DividendsCommonStock
us-gaap:StatementEquityComponents

us-gaap:EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings

us-gaap:FinanceLeaseInterestExpense

us-gaap:FinanceLeaseInterestPaymentOnLiability

us-gaap:FinanceLeasePrincipalPayments

us-gaap:FinanceLeaseRightOfUseAssetAmortization

us-gaap:GainLossOnDispositionOfAssets1

us-gaap:IncomeLossFromDiscontinuedOperationsNetOfTax
us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations

us-gaap:IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare

us-gaap:IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare

us-gaap:IncomeLossFromEquityMethodInvestments

us-gaap:IncreaseDecreaseInAccountsPayableAndAccruedLiabilities

us-gaap:IncreaseDecreaseInDeferredIncomeTaxes

us-gaap:IncreaseDecreaseInIncomeTaxesPayableNetOfIncomeTaxesReceivable

us-gaap:IncreaseDecreaseInReceivables
us-gaap:IncomeStatementLocation
us-gaap:LitigationSettlementAmountAwardedFromOtherParty

us-gaap:OciBeforeReclassificationsNetOfTaxAttributableToParent
us-gaap:StatementEquityComponents

us-gaap:OperatingLeaseCost

us-gaap:OperatingLeasePayments
us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents
us-gaap:OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentBeforeTaxPortionAttributableToParent
us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents
us-gaap:OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent

us-gaap:OtherComprehensiveIncomeLossBeforeReclassificationsTax
us-gaap:StatementEquityComponents
us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations
us-gaap:OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationReclassificationAdjustmentFromAOCIRealizedUponSaleOrLiquidationNetOfTax

us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
us-gaap:StatementEquityComponents

us-gaap:OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax
us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents
us-gaap:OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansTax
us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship
us-gaap:OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax
us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship

us-gaap:OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax

us-gaap:OtherNoncashIncomeExpense

us-gaap:PaymentsForProceedsFromOtherInvestingActivities
us-gaap:BusinessAcquisition
us-gaap:PaymentsToAcquireBusinessesGross
us-gaap:BusinessAcquisition, us-gaap:SubsequentEventType

us-gaap:ProceedsFromBankDebt
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName
us-gaap:ProceedsFromDividendsReceived

us-gaap:ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital

us-gaap:ProceedsFromLifeInsurancePolicies

us-gaap:ProceedsFromLinesOfCredit

us-gaap:ProceedsFromSaleOfProductiveAssets
us-gaap:StatementBusinessSegments
us-gaap:ProceedsFromSaleOfPropertyPlantAndEquipment
us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome
us-gaap:ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax

us-gaap:ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent
us-gaap:StatementEquityComponents

us-gaap:RepaymentsOfBankDebt

us-gaap:RepaymentsOfLinesOfCredit

us-gaap:RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability

us-gaap:RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability
us-gaap:ShareRepurchaseProgram, us-gaap:StatementEquityComponents
us-gaap:TreasuryStockAcquiredAverageCostPerShare
us-gaap:ShareRepurchaseProgram, us-gaap:StatementEquityComponents
us-gaap:TreasuryStockSharesAcquired

us-gaap:TreasuryStockValueAcquiredCostMethod
us-gaap:ShareRepurchaseProgram, us-gaap:StatementEquityComponents
us-gaap:StatementEquityComponents

us-gaap:WeightedAverageNumberDilutedSharesOutstandingAdjustment
us-gaap:StatementBusinessSegments
awi:AccountsReceivableRelatedToSaleProceeds

awi:AcquisitionRelatedContingentConsideration

awi:AssetsExcludingAssetsDiscontinuedOperations
us-gaap:ConsolidationItems
us-gaap:StatementBusinessSegments
us-gaap:BusinessAcquisition
awi:BusinessCombinationContingentConsiderationMaximumEarnoutPayable
us-gaap:FairValueByFairValueHierarchyLevel
awi:ContingentConsideration
us-gaap:FairValueByMeasurementBasis

awi:DeferredTaxAssetsLeaseRightOfUseLiabilities
us-gaap:IncomeTaxAuthority
awi:DeferredTaxAssetsTaxCreditCarryforwardsForeignGross

awi:DeferredTaxAssetsTaxCreditCarryforwardsForeignNet

awi:DeferredTaxLiabilitiesLeaseRightOfUseAssets

awi:EnvironmentalInsuranceRecoveriesReceivedInExcessOfCumulativeExpensesIncurredNoncurrent

awi:FinanceLeaseLiabilityPaymentsDueAfterYearFour

awi:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFour
dei:LegalEntity
awi:PayableForPurchasePriceAdjustments
us-gaap:RetirementPlanType
awi:PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNet
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName
awi:PercentageOfDifferenceInCarryingValueOfInvestmentRecordedInDiscontinuedOperation

awi:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableVestedAndExpectedToVestOutstandingAggregateIntrinsicValue

awi:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableVestedAndExpectedToVestOutstandingNumber

awi:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice
us-gaap:StatementEquityComponents, us-gaap:SubsequentEventType
awi:StockRepurchaseProgramAdditionalAuthorizedAmount

awi:UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRateNetOfFederalBenefit

us-gaap:AccountsNotesAndLoansReceivableNetCurrent
us-gaap:RetirementPlanType
us-gaap:AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent

us-gaap:AccountsPayableOtherCurrent

us-gaap:AccountsPayableTradeCurrent

us-gaap:AccountsReceivableGrossCurrent

us-gaap:AccrualForEnvironmentalLossContingencies
us-gaap:BalanceSheetLocation

us-gaap:AccruedEnvironmentalLossContingenciesNoncurrent

us-gaap:AccruedIncomeTaxesNoncurrent

us-gaap:AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax

us-gaap:AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax

us-gaap:AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax

us-gaap:AllowanceForDoubtfulAccountsReceivableCurrent

us-gaap:AlternativeInvestment
us-gaap:InvestmentType

us-gaap:AssetsHeldForSaleNotPartOfDisposalGroupCurrent

us-gaap:BuildingsAndImprovementsGross
us-gaap:TitleOfIndividual, us-gaap:AwardType, us-gaap:BusinessAcquisition
us-gaap:BusinessAcquisitionEquityInterestIssuedOrIssuableValueAssigned

us-gaap:BusinessCombinationContingentConsiderationLiability
us-gaap:BusinessAcquisition
us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:FairValueByMeasurementBasis
us-gaap:Range, us-gaap:BusinessAcquisition

us-gaap:BusinessCombinationContingentConsiderationLiabilityNoncurrent
us-gaap:BusinessAcquisition
us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
us-gaap:BusinessAcquisition, us-gaap:FiniteLivedIntangibleAssetsByMajorClass
us-gaap:BusinessAcquisition, us-gaap:IndefiniteLivedIntangibleAssetsByMajorClass
us-gaap:BusinessAcquisition
us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities
us-gaap:BusinessAcquisition
us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet

us-gaap:CapitalizedComputerSoftwareGross

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations

us-gaap:CashSurrenderValueOfLifeInsurance

us-gaap:DebtInstrumentCarryingAmount
us-gaap:CreditFacility
us-gaap:DebtInstrument
us-gaap:FairValueByMeasurementBasis
us-gaap:DebtInstrumentFairValue

us-gaap:DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet
us-gaap:IncomeTaxAuthority
us-gaap:DecreaseInUnrecognizedTaxBenefitsIsReasonablyPossible

us-gaap:DeferredCompensationLiabilityClassifiedNoncurrent

us-gaap:DeferredCompensationPlanAssets
us-gaap:PlanName
us-gaap:DeferredCompensationSharebasedArrangementsLiabilityCurrentAndNoncurrent

us-gaap:DeferredIncomeTaxLiabilities

us-gaap:DeferredTaxAssetsCapitalLossCarryforwards

us-gaap:DeferredTaxAssetsGross

us-gaap:DeferredTaxAssetsOperatingLossCarryforwards

us-gaap:DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal

us-gaap:DeferredTaxAssetsOther

us-gaap:DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits

us-gaap:DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions

us-gaap:DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits

us-gaap:DeferredTaxLiabilitiesDeferredExpenseCapitalizedInventoryCosts

us-gaap:DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets

us-gaap:DeferredTaxLiabilitiesInvestments

us-gaap:DeferredTaxLiabilitiesOther

us-gaap:DeferredTaxLiabilitiesPrepaidExpenses

us-gaap:DeferredTaxLiabilitiesPropertyPlantAndEquipment
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPensionPlanCurrentAndNoncurrentLiabilities

us-gaap:DefinedBenefitPensionPlanLiabilitiesNoncurrent
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAccumulatedBenefitObligation
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax

us-gaap:DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent
us-gaap:RetirementPlanType
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncrease

us-gaap:DefinedBenefitPlanBenefitObligation
us-gaap:RetirementPlanType
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo

us-gaap:DefinedBenefitPlanFairValueOfPlanAssets

us-gaap:DefinedBenefitPlanFundedStatusOfPlan
us-gaap:RetirementPlanType
us-gaap:RetirementPlanName
us-gaap:DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateAccumulatedBenefitObligation
us-gaap:RetirementPlanName
us-gaap:DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateProjectedBenefitObligation
us-gaap:InvestmentType
us-gaap:DefinedBenefitPlanPlanAssetsTargetAllocationPercentage
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanUltimateHealthCareCostTrendRate1
us-gaap:InvestmentType
us-gaap:DefinedBenefitPlanWeightedAverageAssetAllocations
us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:DerivativeAssetsLiabilitiesAtFairValueNet
us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByMeasurementBasis
us-gaap:BalanceSheetLocation, us-gaap:DerivativeInstrumentRisk
us-gaap:DerivativeLiabilities

us-gaap:DerivativeLiabilitiesNoncurrent

us-gaap:EmployeeRelatedLiabilitiesCurrent

us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName
us-gaap:EquityMethodInvestmentDifferenceBetweenCarryingAmountAndUnderlyingEquity
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, us-gaap:FairValueByAssetClass
us-gaap:RelatedPartyTransactionsByRelatedParty
us-gaap:EquityMethodInvestmentOwnershipPercentage
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue

us-gaap:FinanceLeaseLiability

us-gaap:FinanceLeaseLiabilityCurrent

us-gaap:FinanceLeaseLiabilityNoncurrent

us-gaap:FinanceLeaseLiabilityPaymentsDue

us-gaap:FinanceLeaseLiabilityPaymentsDueNextTwelveMonths

us-gaap:FinanceLeaseLiabilityPaymentsDueYearFive

us-gaap:FinanceLeaseLiabilityPaymentsDueYearFour

us-gaap:FinanceLeaseLiabilityPaymentsDueYearThree

us-gaap:FinanceLeaseLiabilityPaymentsDueYearTwo

us-gaap:FinanceLeaseLiabilityPaymentsRemainderOfFiscalYear

us-gaap:FinanceLeaseLiabilityUndiscountedExcessAmount

us-gaap:FinanceLeaseRightOfUseAsset

us-gaap:FinanceLeaseWeightedAverageDiscountRatePercent

us-gaap:FiniteLivedIntangibleAssetsAccumulatedAmortization
us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearFive

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearFour

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearThree

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo

us-gaap:FiniteLivedIntangibleAssetsGross
us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:IncomeTaxesReceivable

us-gaap:IncomeTaxesReceivableNoncurrent
us-gaap:IncomeTaxAuthority
us-gaap:IncreaseInUnrecognizedTaxBenefitsIsReasonablyPossible

us-gaap:IntangibleAssetsGrossExcludingGoodwill

us-gaap:InventoryWorkInProcess

us-gaap:InvestmentsFairValueDisclosure
us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:InvestmentType
us-gaap:InvestmentType

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths

us-gaap:LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear
us-gaap:DebtInstrument, us-gaap:ShortTermDebtType
us-gaap:LettersOfCreditOutstandingAmount
us-gaap:ShortTermDebtType
us-gaap:CreditFacility
us-gaap:LineOfCredit
us-gaap:DebtInstrument
us-gaap:DebtInstrument, us-gaap:ShortTermDebtType
us-gaap:LineOfCreditFacilityCurrentBorrowingCapacity
us-gaap:LongtermDebtType
us-gaap:ShortTermDebtType
us-gaap:DebtInstrument, us-gaap:ShortTermDebtType
us-gaap:LineOfCreditFacilityRemainingBorrowingCapacity
us-gaap:ShortTermDebtType

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo
dei:LegalEntity, us-gaap:StatementScenario
us-gaap:LossContingencyAccrualAtCarryingValue

us-gaap:OperatingLeaseWeightedAverageDiscountRatePercent
us-gaap:IncomeTaxAuthority
us-gaap:OperatingLossCarryforwards

us-gaap:OtherAccruedLiabilitiesNoncurrent

us-gaap:OtherAssetsMiscellaneousCurrent

us-gaap:OtherAssetsMiscellaneousNoncurrent
us-gaap:RetirementPlanType
us-gaap:OtherPostretirementDefinedBenefitPlanLiabilitiesCurrentAndNoncurrent

us-gaap:OtherPostretirementDefinedBenefitPlanLiabilitiesNoncurrent

us-gaap:OtherReceivablesGrossCurrent

us-gaap:PercentageOfLIFOInventory

us-gaap:PostemploymentBenefitsLiabilityCurrent

us-gaap:PrepaidExpenseCurrent
us-gaap:RelatedPartyTransactionsByRelatedParty
us-gaap:RelatedPartyTransactionDueFromToRelatedParty
us-gaap:AwardType
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
us-gaap:AwardType
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
us-gaap:Range, us-gaap:StatementEquityComponents, us-gaap:SubsequentEventType
us-gaap:StockRepurchaseProgramAuthorizedAmount1
us-gaap:TaxCreditCarryforward
us-gaap:TaxCreditCarryforwardAmount

us-gaap:TreasuryStockCommonValue

us-gaap:UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued

us-gaap:UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate
us-gaap:ValuationAllowancesAndReservesType
us-gaap:ValuationAllowancesAndReservesBalance

us-gaap:WeightedAverageCostInventoryAmount
us-gaap:StatementBusinessSegments

Plots across concepts


IncomeStatement
Other Comprehensive Income Loss Net Of Tax
Expenses
Interest 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
Accumulated Depreciation Depletion And Amortization Property Plant And Equipment
Liabilities
Operating Lease Liability
Current Liabilities
Accrued Income Taxes Current
Noncurrent Liabilities
Operating Lease Liability Noncurrent
Stockholders Equity
Accumulated Other Comprehensive Income Loss Net Of Tax
Per Share
Common Stock Dividends Per Share Declared
CashFlow
Net Cash Provided By Used In Financing Activities
NetCashProvidedByUsedInOperatingActivities
Increase Decrease In Inventories
NetCashProvidedByUsedInInvestingActivities
Payments For Proceeds From Other Investing Activities
NetCashProvidedByUsedInFinancingActivities
Net Cash Provided By Used In Financing Activities
Shares
Weighted Average Number Of Shares Outstanding Basic
DividendsAndRepurchase
Dividends Common Stock
OperatingLeaseLiability
Operating Lease Liability Current
NonoperatingIncomeExpense
Nonoperating Income Expense
LesseeOperatingLeaseLiabilityPaymentsDue
Lessee Operating Lease Liability Payments Remainder Of Fiscal Year
InventoryNet
Inventory Finished Goods
AccountsReceivable
Allowance For Doubtful Accounts Receivable Current

Tables

  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding █▁48.148.0NA48.048.048.0NA49.549.849.5NA51.952.653.8NA53.553.754.5NA56.056.055.6NA55.955.855.7NA55.555.355.3NA59.059.959.8NA59.45.94e-0559.1NA58.858.958.8NA58.258.1
us-gaap:WeightedAverageNumberOfSharesOutstandingBasic ▁█47.747.8NA47.947.848.0NA48.749.048.7NA50.751.953.0NA53.053.354.1NA55.555.655.6NA55.555.555.3NA55.054.854.8NA58.459.359.2NA58.95.88e-0558.6NA58.458.358.1NA57.757.6
us-gaap:EarningsPerShareBasic █▇▇█▇▁▇██▇▇█▇▇▇▇▇▇▇█▇▆▆▇▇▇▆▇▇▇▇▇▇▆▆█▇▇▆▇▇▇▆▇▇1.150.740.47000000000000021.131.05-4.710.99000000000000021.51.110.80.69999999999999971.50.90.530.63000000000000030.930.770.560.491.270.3-0.18-0.240.570.530.84-0.070000000000000060.570.340.310.22000000000000020.860.50.050.140000000000000121.060.710.310.13999999999999990.890.640.23-0.360000000000000040.420.47
us-gaap:EarningsPerShareDiluted █▇▇██▁▇██▇▇█▇▇▇▇▇▇▇█▇▆▆▇▇▇▆▇▇▇▇▇▇▆▆█▇▇▆▇▇▇▆▇▇1.140.740.47000000000000021.131.05-4.710.96000000000000041.481.090.780.70000000000000021.460.890.510.61999999999999970.920.770.560.49000000000000021.260.3-0.18-0.240.570.530.83-0.070000000000000060.570.340.30.21000000000000020.850.50.050.140000000000000121.050.70.310.14999999999999990.890.640.23-0.360000000000000040.420.46
us-gaap:IncomeLossFromContinuingOperationsPerBasicShare ▇▇▇▇▇▁▇█▇▇▇▇▇▇█▇▇▇▆▇▆▆▆▆▆▆▇▇▆▆▆▇▆▆▆▇▇▆▆▇1.15e-067.8e-077.2e-071.13e-061.03e-06-4.64e-061.07e-061.8600000000000002e-061.3e-067.5e-077.400000000000002e-071.26e-069.100000000000001e-077.8e-071.96e-068.2e-077.8e-075.699999999999999e-075.2e-071e-063e-07-2.1e-07-1.8999999999999995e-075.4e-075.3e-077e-085.900000000000001e-075.699999999999999e-073.8e-073.1e-072.1999999999999998e-079.499999999999999e-075.1e-075.0000000000000004e-081.5000000000000036e-071.25e-067.2e-073.2e-071.5999999999999992e-078.8e-07NANANANANA
us-gaap:IncomeLossFromContinuingOperationsPerDilutedShare ▇▇▇▇▇▁▇█▇▇▇▇▇▇█▇▇▇▆▇▆▆▆▇▆▆▇▇▆▆▆▇▆▆▆▇▇▆▆▇1.1399999999999999e-067.8e-077.2e-071.13e-061.03e-06-4.64e-061.04e-061.83e-061.28e-067.3e-077.399999999999998e-071.23e-069.000000000000001e-077.6e-071.94e-068.100000000000001e-077.7e-075.6e-075.2e-079.9e-072.9e-07-2.1e-07-1.9999999999999996e-075.4e-075.3e-077e-085.800000000000001e-075.699999999999999e-073.8e-073e-072.0999999999999997e-079.399999999999999e-075.1e-075.0000000000000004e-081.5000000000000036e-071.24e-067.1e-073.2e-071.6999999999999993e-078.8e-07NANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
 EBT Margin us-gaap:BusinessAcquisition awi:ArkturaMozAndTurf17.5NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 Gross Margin us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName,us-gaap:EquityMethodInvestmentNonconsolidatedInvestee awi:WorthingtonArmstrongVenture,us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOrGroupOfInvestees█▆▃▃▁▅▄▆▇108.798.686.386.375.395.490.999.9105.5NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 Operating Margin us-gaap:StatementBusinessSegments awi:ArchitecturalSpecialties█▇▅▆▄▅▄▆▆▄▄▄▃▂▂▂▂▁71.963.255.659.045.351.049.758.557.945.447.547.741.936.636.834.935.530.0NANANANANANANANANANANANANANANANANANANANANANANANANANANA
 Operating Margin us-gaap:StatementBusinessSegments awi:MineralFiber▇▅▄▄▁▆▆█▇▅▅▇▇▅▃▆▅▅208.1188.7183.1187.3157.9197.7197.2218.6214.1196.7191.4212.8206.7190.7177.5199.0190.1189.8NANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
 TTM Greenblatt ROC _ _▆▄▃▅▅▆▅█▆▄▄▆▅▄▃▅▆▅▃▅▄▂▁▆▅▃▄▅▄▄▂▇▅▄▃█▆▃▂▇▅▄78.354.144.172.362.476.062.2113.387.254.752.581.366.049.644.769.078.463.040.371.051.718.38.879.763.135.859.869.057.852.530.493.667.647.042.3108.676.941.621.692.872.752.1NANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
us-gaap:ComprehensiveIncomeNetOfTax ▆▅▅▅▅▅▆█▅▅▄▆▅▅▆▆▅▅▅▆▅▄▄▅▅▅▁▅▅▅▆▆▅▅▃▆▅▅▂▅▅▅▃▆56.940.023.348.547.748.251.2154.650.042.1-15.871.431.639.353.970.444.344.139.477.210.80.9-16.430.445.642.7-137.530.923.523.086.757.839.410.0-55.573.133.723.6-85.137.341.629.3-53.053.9NA
us-gaap:CostOfGoodsAndServicesSold ▄▄▄▄▃▄▄▄▄▄▄▄▄▄▁▅▄▄▄▄▄▇▇▇▇▆▆██▇▇██▇▇▇█▇▇██▇▇██175.1164.4155.9155.1135.4157.4158.3165.4168.6150.7156.8162.6165.9156.5-107.0241.0219.7216.1212.2225.2222.8440.3439.9480.6474.8421.9334.2564.1554.3479.4527.3549.8542.3477.8477.1507.8533.7523.2522.8576.7563.9524.5519.3567.8554.4
us-gaap:GrossProfit ▅▄▄▄▃▄▄▅▅▄▄▄▄▃▁▅▅▄▄▅▄▆▆▇▇▆▅▇▇▆▆▇▇▆▆█▇▆▆██▇▅▇▇104.987.582.891.267.891.388.6111.7103.491.482.197.982.770.82.5110.9111.199.385.7109.791.5131.5137.5177.9157.9129.5108.4164.2155.7155.0134.0179.9164.3144.5135.7186.9176.2144.8129.3196.9184.7160.7123.6172.0170.4
us-gaap:IncomeLossFromContinuingOperations ▇▇▇▇▇▁▇█▇▇▇▇▇▇█▇▇▆▆▇▆▆▅▆▆55.137.534.854.249.5-222.651.590.763.736.436.664.247.641.2104.843.541.530.828.555.916.6-7.1-13.919.715.1NANANANANANANANANANANANANANANANANANANANA
us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest ▇▇▇▇▇▁▇██▇▇█▇▇▇▇▇▇▇▇▇▆▆▇▇▇▇▇▇▇▆█▇▆▇█▇▇▆█▇▇▆▇▇74.349.743.169.460.9-300.159.8106.783.149.847.480.665.349.435.461.270.155.434.563.641.30.5-10.355.255.123.945.358.145.636.218.382.056.515.129.794.962.931.211.283.161.237.6-38.045.149.4
us-gaap:IncomeTaxExpenseBenefit ▇▇▇▇▇▁▇▇▇▇▇▇▇▇▂▇██▆▇█▇▆██▇▇██▇▇██▇▇▇▇▇▆███▅▇▇19.212.28.315.211.4-77.58.316.019.413.410.816.417.78.2-69.417.728.624.66.07.724.712.11.124.925.220.113.026.324.619.37.526.125.911.920.520.921.113.02.730.623.324.1-17.020.522.6
us-gaap:IncomeTaxesPaidNet ▅▃▃▃▂▂▄▆▆▃█▆▂▂▄▅▄▁▄▅▃▃▃▅▄▅▂▃▃▂▃▃▃▃▃▃▂▂▂▂▃▄17.97.24.65.20.01.112.122.720.63.031.618.6-0.41.811.918.08.4-6.29.814.25.83.96.514.67.715.61.95.95.51.75.62.73.52.62.94.31.7-0.51.81.47.09.7NANANA
us-gaap:InterestExpense ▁▁▁▂▁▂▂▃▂▃▃▂▂▂▂▂▂▂▂▂▃▅▃▃▃▃▃▃▃▃▃▃▃█▃▃▄▃▃▃▃▄▂▁▁5.65.75.46.15.96.76.811.79.510.410.39.99.89.27.99.19.29.26.49.012.521.911.411.311.411.211.611.011.811.612.411.411.833.214.014.114.411.210.911.311.514.89.43.94.0
us-gaap:InterestPaidNet ▁▂▂▁▂▃▂▄▅█▁▆▄▄▄▄5.45.75.95.65.76.96.27.58.610.85.39.37.67.77.67.7NANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:NetIncomeLoss █▇▇▇▇▁▇█▇▇▇█▇▇▇▇▇▇▇█▇▆▆▇▇▇▆▇▇▇▆▇▇▆▆█▇▇▆▇▇▇▆▇▇55.135.422.854.050.3-226.247.773.254.539.134.676.247.327.833.749.441.330.427.170.616.9-9.9-13.831.829.646.6-3.631.618.916.910.850.429.93.08.462.941.818.28.552.537.913.5-21.024.626.8
us-gaap:NonoperatingIncomeExpense ▃▃█▃▃▁▃▃▃▃▃▃▃▃▃▃▃▃1.61.3719.23.24.4-369.44.45.15.45.55.29.29.19.0-2.5-12.38.38.9NANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:OperatingIncomeLoss ▆▅▅▆▆▆▆█▇▅▅▆▆▅▅▆▆▆▄▆▅▃▃▆▆▄▅▆▅▅▄▇▆▅▅█▆▅▄▇▆▅▁▅▅78.354.144.172.362.476.062.2113.387.254.752.581.366.049.644.769.078.463.040.371.051.718.38.879.763.135.859.869.057.852.530.493.667.647.042.3108.676.941.621.692.872.752.1-30.245.052.9
us-gaap:OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax ▂▃▃▂▂▂▂█▃▃▂▂▁▃▃▃▃▃▁▂▂▃▂▂▃▁▁▁▃▂▂▃▂▂▂▃▂▃▂▂▃▃0.50.61.099999999999999-6.20.1-2.1-0.578.60.75.3-5.7-7.0-20.85.93.67.02.811.1-19.4-2.0-13.21.4-4.2-13.47.4-15.3-19.6-14.14.5-0.4-0.16.2-8.7-6.2-0.110.4-8.65.3-3.7-13.34.011.4NANANA
us-gaap:OtherComprehensiveIncomeLossNetOfTax ▃▃▃▃▃█▃▅▃▃▂▃▃▃▄▄▃▄▄▃▃▃▃▃▄▃▁▃▃▃▅▃▃▃▂▃▃▃▂▃▃▄1.84.60.5-5.5-2.6274.43.581.4-4.53.0-50.4-4.8-15.711.520.221.03.013.712.36.6-6.110.8-2.6-1.416.0-3.9-133.9-0.74.66.175.97.49.57.0-63.910.2-8.15.4-93.6-15.23.715.8NANANA
 us-gaap:OtherNonoperatingIncomeExpense us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome,us-gaap:StatementEquityComponents us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome,awi:AccumulatedDefinedBenefitPlansAdjustmentNetSettlementGainLossNANA0.00.00.0-374.4NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:OtherNonoperatingIncomeExpense us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome,us-gaap:StatementEquityComponents us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome,us-gaap:AccumulatedDefinedBenefitPlansAdjustmentNetPriorServiceCostCredit▃▄▄▄▃▄█▁0.00.10.10.10.00.10.3-0.1NANA-0.4NANANA0.4NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax ▄▄▄▄▃▄▄▄▄▄▄▄▄▄▄▄▄▄▁▄▄▆▆▇▇▆▅█▇▇▇█▇▇▇▇▇▇▇██▇▇██280.0251.9238.7246.3203.2248.7246.9277.1272.0242.1238.9260.5248.6227.3214.3233.9225.6315.4-99.3334.9314.3571.8577.4658.5632.7551.4442.6728.3710.0634.4661.3729.7706.6622.3612.8694.7709.9668.0652.1773.6748.6685.2642.9739.8724.8
us-gaap:SellingGeneralAndAdministrativeExpense ▅▅▅▄▄▄▄▄▄▅▄▄▄▄▁▅▅▅▅▅▅▇█▇▇▇▅▇▇▇▇▇▇▇▇▆▇▇▇▇█▇███60.054.454.541.033.034.840.041.337.455.645.335.340.937.5-27.155.852.454.660.055.755.8104.2127.7110.4106.1103.052.5114.0114.7117.3116.8103.0111.2112.7105.794.0114.2116.6117.2118.8122.2120.1130.8125.2131.8
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
us-gaap:Assets ▂▂▂▂▁▁▁▁▃▃▃▃▂▂▃▂▂▂▂▂▂▅▆▆▆▅▅▇▇▇▇▆▇▆▆▇▆█▇▇▇1716.71715.31718.51633.71544.31590.31493.31509.71890.01942.61873.52002.51824.71825.11873.51829.71784.31757.81758.01732.71697.02625.92691.92694.42657.92573.82606.23006.13058.12991.52916.62814.92961.82869.72854.32885.22803.43262.12994.73118.13071.1NA2922.4NANA
us-gaap:LiabilitiesAndStockholdersEquity ▂▂▂▂▁▁▁▁▃▃▃▃▂▂▃▂▂▂▂▂▂▅▆▆▆▅▅▇▇▇▇▆▇▆▆▇▆█▇▇▇1716.71715.31718.51633.71544.31590.31493.31509.71890.01942.61873.52002.51824.71825.11873.51829.71784.31757.81758.01732.71697.02625.92691.92694.42657.92573.82606.23006.13058.12991.52916.62814.92961.82869.72854.32885.22803.43262.12994.73118.13071.1NA2922.4NANA
us-gaap:StockholdersEquity ▃▃▃▃▂▂▂▂▁▂▁▂▂▂▃▂▂▁▁▁▁▅▅▅▅▄▄▅▅▅▄▄▅▅▅▅▄▄▇██498.3473.6450.9442.6402.9370.4364.9367.3243.1280.3261.2330.9404.1403.8419.3366.2297.3271.2266.4259.1202.4770.3768.8783.2747.3697.2649.1776.9738.3710.2673.2579.6778.9734.8719.1772.7695.5657.01130.21212.31172.2NA1090.81938.51882.1
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
us-gaap:AssetsCurrent ▁▁▁▁▁▂▁▁▄▄▄▄▃▃▃▂▂▂▂▂▂▄▅▅▅▄▄▅▅▅▅▅▆▅▅▆▅█▇▆▆317.5316.3311.8323.3320.0345.4244.4296.7695.6749.0752.8780.9583.0599.1648.9407.8362.0353.5406.2428.6390.0816.0880.8887.7860.0791.8811.5933.9981.7953.5884.0906.41084.31025.21019.91050.2993.51468.31209.31183.61147.6NA1020.7NANA
us-gaap:CashAndCashEquivalentsAtCarryingValue ▂▂▂▂▂▂▁▂▃▄▄▄▂▂▂▂▁▁▂▂▂▂▃▃▃▂▃▂▂▂▂▂▄▄▆▄▃█▆▅▄▃▄█▇119.0121.6136.9138.8117.1146.945.398.0240.3273.8325.7327.0129.0116.9159.6116.579.781.0141.9142.599.4149.8244.8250.0201.6132.0185.3148.4152.6131.0135.2137.7304.7278.0480.6298.6217.3683.3480.6376.9304.6244.4315.8682.2599.9
us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents ▃▃▃▃▃▄▁▂▆▇██119.0121.6136.9138.8117.1146.945.398.0240.3273.8325.7327.0NANA159.6NANANA141.9NANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:ReceivablesNetCurrent ▂▂▁▂▂▂▁▂▂▁▁▁▁▁▂▃▃▃▂▃▃▅▄▅▅▅▅▆▇▆▅▇▇▆▅▆▇▇▆██92.991.378.390.1106.896.985.188.896.785.379.981.481.671.790.8142.5140.2127.2108.3128.3126.9213.4184.3207.2220.3215.8195.2252.6276.9244.3222.2260.5275.8237.1204.6255.0281.3269.8232.5294.3309.1NA229.5NANA
us-gaap:InventoryNet ▂▂▂▁▁▁▁▁▁▁▁▁▁▁▁▂▂▂▂▂▂▆▆▆▆▆▆███▇▇▇▇▇▇▇▇▇██83.181.981.577.474.068.568.569.470.872.161.263.761.760.053.8117.8116.9116.1109.0109.5104.2345.8344.2340.1349.4351.4335.5415.9426.7428.5381.7384.4387.6395.3369.8380.7403.4403.3388.9426.7437.9NA398.5NANA
us-gaap:InventoryFinishedGoods ▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▂▂▂▂▂▂▆▅▅▆▆▆███▇▇▇▇▇▇▇46.245.044.643.143.439.240.239.440.540.138.838.539.038.033.282.685.684.480.581.375.3216.1202.0211.8242.9250.1243.2307.5317.6317.3292.8289.2284.2281.9265.9277.9292.6NA271.5NANANANANANA
us-gaap:InventoryLIFOReserve █▆▆▆▆▆▆▅▆▅▄▄▄▂▁▁▁12.211.210.910.811.110.710.710.310.810.19.89.79.78.88.27.98.0NA7.2NANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:InventoryRawMaterialsAndSupplies ▂▂▂▂▂▂▂▂▂▂▁▁▁▁▁▂▂▂▁▁▁▇████▇██▇▇▆▇▇▆▆▇43.042.542.340.537.535.535.034.935.937.227.829.428.327.726.139.135.034.832.433.233.8127.5138.2139.3140.2138.9133.9143.1137.6133.2118.6117.7122.2128.6107.8106.2118.1NA118.1NANANANANANA
us-gaap:OtherAssetsCurrent ▃▃▂▂▂▂▂▂▁▁▁▁▁▁▁▃▂▃▃▂▃█▇█▇▇▇▇▇█▇▆▆▆▅▅▆▆▅▅▆20.419.712.811.711.315.315.514.16.78.24.88.56.98.47.923.617.619.220.817.220.365.260.969.060.457.958.859.456.366.555.551.952.146.242.340.946.848.638.641.950.2NA35.3NANA
us-gaap:Land NANA33.3NANANA32.6NANANA32.4NANANA32.5NANANA38.0NANANA72.0NANANA73.2NANANANANANANANANANANANANANANANANANA
us-gaap:MachineryAndEquipmentGross NANA645.7NANANA624.8NANANA575.4NANANA537.1NANANA706.4NANANA1203.9NANANA1098.4NANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
 us-gaap:AssetsNoncurrent us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName,us-gaap:EquityMethodInvestmentNonconsolidatedInvestee awi:WorthingtonArmstrongVenture,us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOrGroupOfInvesteesNANA40.8NANANA37.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:ConstructionInProgressGross NANA40.9NANANA41.8NANANA49.8NANANA46.2NANANA90.8NANANA134.5NANANA143.2NANANANANANANANANANANANANANANANANANA
us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment ▃▃▃▃▃▃▃▂▂▂▂▂▂▁▁▄▃▃▃▃▂██▇▇▇▆█▇▇▆▆▆▅▅▅▄▄▄▄▄471.0452.3487.1491.0474.8460.6447.5439.5432.1421.8412.9406.1396.0375.7361.4497.5489.4469.6445.5444.7430.0739.6718.6709.5687.9661.5644.3721.5691.8663.7639.7615.2613.8592.5583.8566.9548.0538.5506.4514.2526.0NA482.8NANA
us-gaap:AmortizationOfIntangibleAssets ██▄▄▂▂▃▃▃▂▂▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁10.510.26.76.14.74.65.25.25.63.94.13.73.73.63.63.73.73.63.53.53.43.63.63.63.83.63.63.73.63.63.63.63.63.63.63.33.73.53.53.4NANANANANA
us-gaap:PropertyPlantAndEquipmentNet ▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▃▃▃▃▃▃██▇▇▇▇████▇▇▇▇▆▆▅▅▅▅527.6523.6529.9514.8514.9521.3524.6508.8511.9510.5501.0484.3484.8489.5499.9699.0696.0689.2669.6664.8661.11100.71096.31067.11068.31053.31062.41128.41142.31113.21107.21058.21036.01013.71005.0937.6918.4906.9902.9861.0855.6NA854.9NANA
us-gaap:InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures ▂▁▁▁▁▂▂▂▁▁▁▃▄▄▄▄▄▄▄▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▆██50.046.241.244.948.559.858.565.741.638.740.877.5111.8107.6107.3105.4109.2105.3106.2119.3119.6131.1130.8130.9130.9127.3129.0132.2132.6128.6132.0133.4133.4134.0133.5136.7135.9137.0141.0195.4194.7NA188.6NANA
us-gaap:Goodwill ███▆▃▃▃▃▃▃▂▂▂▁▁▁▁▁▁166.8166.5160.7108.253.453.253.042.640.840.619.219.416.911.311.310.710.210.11.1NANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:IndefiniteLivedIntangibleAssetsExcludingGoodwill ▁▁█344.9344.8347.2NANANA321.5NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:IntangibleAssetsNetExcludingGoodwill ▅▆█▄▁▂▂434.2444.3457.5428.2402.8407.2411.9NANANA422.8NANANANANANANA433.4437.3440.7486.9489.7493.2NANA501.4NANANANANANANANANANANANANANANANANANA
us-gaap:OperatingLeaseRightOfUseAsset ▂▁▁▁████▆▅20.520.019.220.334.334.535.335.230.328.8NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:OtherAssetsNoncurrent ▁▁▁▁▆▆▁▁▂▂▃▄▃▃▂▂▂▂▂▂▂▂▂▃▃▃▃▄▃▄▄▅▆▅▇███▆▇▇59.658.157.756.686.587.957.959.660.164.068.572.669.568.664.364.464.364.564.960.563.361.062.668.166.468.167.973.971.273.273.481.585.680.993.5100.198.297.690.593.293.2NA96.4NANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
us-gaap:AccountsPayableAndAccruedLiabilitiesCurrent ▂▁▂▁▁▂▂▂▇▇▇▇▁▁▁▃▃▃▃▃▃▇▇▇▇▆▆██▇▇█▇▇▇▆▇▆▇▇▇140.0115.5136.5100.8107.1127.0148.7141.8378.3390.9383.3366.5103.892.6108.4169.8163.9172.4197.1201.3202.2348.3380.4367.3361.6325.5345.5399.5414.5379.4383.6399.5383.4346.2346.3345.0347.9342.7359.6378.7385.4NA340.3NANA
us-gaap:AccruedIncomeTaxesCurrent ▄▆▃▁▂▁▁▁▅▅▁▂▂▂▁▃▄▂▂█▇▄▃▄▃▂▂▄▃▃▃▅▃▃▄▆█▆▃5.28.54.00.31.00.30.20.46.47.20.91.91.21.60.53.64.51.22.011.19.64.43.24.82.92.02.54.53.42.92.76.94.02.64.18.111.08.54.0NANANA4.9NANA
us-gaap:LiabilitiesCurrent ▁▁▁▁▁▁▁▁▅▅▅▅▂▂▂▂▂▂▂▂▂▄▄▄▄▃▃▄▄▄▄▄▃▃▃▄▄█▃▃▃177.6156.2172.3132.3156.9169.8155.2142.2581.5589.9549.5533.1259.9245.1269.9205.9215.9221.1224.1230.5222.4405.8436.3421.6410.9370.8388.1441.2509.8456.0410.9425.2399.8354.9384.7404.7407.3890.6386.1394.0395.9NA382.9NANA
us-gaap:LongTermDebtCurrent ████▆▃▁25.025.025.025.018.812.56.3NA62.562.555.047.540.032.532.532.532.532.525.017.510.052.552.149.045.942.839.636.533.430.323.917.511.14.833.034.934.928.718.112.98.0NA10.3NANA
us-gaap:OperatingLeaseLiabilityCurrent ▇▆▄▁█▆▆▅▅5.35.24.84.45.55.25.25.15.1NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
us-gaap:LiabilitiesNoncurrent ▂▂▂▂▁▂▁▁▂▂▂▂▃▃▃▃▃▃▃▃▃▅▅▅▅▅▆███████▇▇▇▇▅▅▅1040.81085.51095.31058.8984.51050.1973.21000.21065.41072.41062.81138.51160.71176.21184.31257.61271.11265.51267.51243.11272.21449.81486.81489.61499.71505.81569.01788.01810.01825.31832.51810.11783.11780.01750.51707.81700.61714.51478.41511.81503.0NA1448.7NANA
 us-gaap:LongTermDebt us-gaap:ExtinguishmentOfDebt us-gaap:LongTermDebtNANA715.5NANANA610.8NANANA819.8NANANA850.2NANANA873.6NANANA1003.0NANANA1042.6NANANANANANANANANANANANANANANANANANA
us-gaap:LongTermDebtNoncurrent ▂▂▂▂▁▂▁▂▃▃▃▄▄▄▄▄▄▅▅▅▅▆▆▆▇▇▇▇▇█████████▄▄▅653.4684.4690.5656.5607.5678.5604.5650.5734.6749.7764.8779.9795.0810.1817.7825.3832.9840.5848.6856.2863.8925.7950.9964.8978.7992.51003.01013.61024.31035.01042.61050.11057.71065.31038.01046.31054.51062.8822.9830.6838.2NA839.6NANA
us-gaap:DeferredIncomeTaxLiabilitiesNet █▃▁▄▁165.6160.9158.4162.0158.6NA163.9NANANA124.4NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:OtherLiabilitiesNoncurrent ▄▆▆▆▇▇▂▃▂▂▂▂▂▂▂▁▁▁▁▂▂▂▃▄▄▄▄▄▅▅▅▆▆▇███▇▇▇▆56.072.476.572.683.379.737.841.237.933.038.033.233.034.135.527.628.329.429.134.736.640.549.651.951.150.853.258.563.464.167.569.268.481.786.690.389.179.478.978.874.8NA70.3NANA
us-gaap:OperatingLeaseLiabilityNoncurrent ▁▁▁▁▇███▆15.415.014.615.628.829.330.130.125.2NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo NANA4.14.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree NANA3.03.1NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour NANA2.12.2NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive NANA1.7NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive NANA6.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
us-gaap:StockholdersEquity ▃▃▃▃▂▂▂▂▁▂▁▂▂▂▃▂▂▁▁▁▁▅▅▅▅▄▄▅▅▅▄▄▅▅▅▅▄▄▇██498.3473.6450.9442.6402.9370.4364.9367.3243.1280.3261.2330.9404.1403.8419.3366.2297.3271.2266.4259.1202.4770.3768.8783.2747.3697.2649.1776.9738.3710.2673.2579.6778.9734.8719.1772.7695.5657.01130.21212.31172.2NA1090.81938.51882.1
us-gaap:AdditionalPaidInCapitalCommonStock ▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▆▆▆▆▆▆▆▅▅▅▅▅▅▅▅▅▅███554.7556.6553.7552.6551.7557.3555.7549.4538.1553.3547.4512.2535.7532.0516.8512.6509.6506.9504.9504.2516.91152.41151.81149.81144.31139.81134.41124.71117.01112.41098.41091.51087.21082.51076.81074.91070.81066.01467.51464.51461.7NA1451.2NANA
us-gaap:RetainedEarningsAccumulatedDeficit █▇▇▇▇▆██▇▇▇▇▆▆▅▅▅▄▄▄▃▃▃▃▃▃▃▃▂▂▂▂▂▂▂▁▁939.8895.0869.8857.1812.8772.11008.2970.3905.7895.1865.0839.0762.8715.5633.4599.7550.3509.0469.9442.8372.2355.3365.2379.0347.2317.6271.0274.6243.0224.1207.2196.4146.0116.1113.1104.741.8NA77.168.616.1NA-35.3NANA
us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax ██████▃▃▂▂▂▃▃▃▄▃▃▃▃▂▂▁▁▁▁▁▁▃▃▃▃▂▂▂▁▃▂▃▂▄▄-102.9-104.7-109.3-109.8-104.3-101.7-376.1-379.6-461.0-456.5-459.6-409.2-404.4-388.7-345.9-366.1-387.1-390.1-403.8-419.3-425.9-476.6-487.4-484.8-483.4-499.4-495.5-361.6-360.9-365.5-371.6-447.5-454.9-464.4-471.4-407.5-417.7-409.6-415.0-321.4-306.2NA-325.7NANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
us-gaap:NetCashProvidedByUsedInOperatingActivities ▆▄▆▆▆▄▆▆▅▄▅▆▆▄▆▆▅▄▅▅▄▁▆▇▇▂▇▇▆▂▅█▆▃▇█▆▂▇▇▆▂▅▇62.319.670.469.753.025.761.374.432.314.744.270.063.026.065.562.531.810.651.952.89.6-65.059.785.193.0-34.197.788.755.3-32.952.0118.557.2-14.079.2111.262.7-33.182.397.868.2-36.149.185.1NA
us-gaap:NetCashProvidedByUsedInInvestingActivities ▃▂▁▁▃▃▂▂▃▂▃█▃▃▂▃▃▂▂▃▃▂▂▂▂▃▂▂▂▂▂▂▂▂▂▂▂▂▃▂▂▃▂▃2.0-8.8-88.9-62.50.49.9-18.2-39.36.4-38.023.7287.2-7.15.8-12.9-0.6-3.2-37.5-10.1-3.06.4-10.3-56.2-21.0-16.2-8.1-52.4-29.1-45.8-22.0-59.4-23.9-25.2-37.3-30.5-19.2-26.7-15.524.0-19.7-14.9-7.8-37.1-6.6NA
us-gaap:NetCashProvidedByUsedInFinancingActivities ▅▅▆▆▅▆▅▄▅▅▅▄▅▅▆▅▅▅▅▆▅▅▆▆▆▆▆▅▆▆▆▃▆▆▆▆▁█▆▆▆▅▂▆-67.2-26.216.014.2-83.566.8-95.9-186.4-72.7-29.9-66.8-156.7-41.6-64.2-10.5-27.6-28.5-36.1-40.7-5.3-62.8-20.1-8.7-8.6-9.5-5.52.0-60.09.451.94.9-262.3-0.1-6.2-11.0-13.6-498.7249.6-0.2-2.53.2-32.9-381.5-9.3NA
us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect ▅▅▅▆▄█▄▁▄▄▅-2.6-15.3-1.921.7-29.8101.6-52.7-152.3-33.5-51.9-1.3NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
us-gaap:DepreciationDepletionAndAmortization ▃▃▃▃▂▂▂▂▂▁▂▁▂▃▃▃▂▂▂▂▂▄▄▄▄▄▄▅▅▄▄▄▃▃▃▃▃▅▃▃▄▅▆█25.725.622.424.119.318.219.718.618.715.117.917.221.522.826.324.319.718.919.119.920.030.231.429.528.928.531.335.432.730.029.627.626.425.427.025.426.134.225.027.029.931.938.448.5NA
us-gaap:IncreaseDecreaseInInventories ▄▄▄▄▄▄▄▄▄▅▄▃▄▅▄▄▄▄▄▄▄▄▄▄▄▆▃▄▄█▄▃▃▇▃▄▅▅▁▄▅▆▃▄1.22.1-0.11.45.41.0-1.2-1.6-1.411.4-5.4-7.84.817.3-5.1-0.3-0.52.32.65.0-0.3-0.35.3-5.6-3.419.4-16.6-1.9-1.947.2-4.0-6.5-7.229.6-14.6-4.27.611.8-35.2-3.511.617.9-16.7-4.7NA
us-gaap:IncreaseDecreaseInOtherOperatingCapitalNet ▄▄▂█▂▁▃▃▃▃▅▂▃▃▃▃▂▃▃▃▃▃▄▃▃▂▂▂▃▂▂▄▃▂5.05.8-2.724.5-2.0-7.81.0-0.42.4-0.310.6-2.81.41.3-0.71.7-1.61.40.50.51.82.34.7-0.51.5-4.3-2.7-3.33.6-1.2-1.25.0-0.1-3.0NANANANANANANANANANANA
us-gaap:NetCashProvidedByUsedInOperatingActivities ▆▄▆▆▆▄▆▆▅▄▅▆▆▄▆▆▅▄▅▅▄▁▆▇▇▂▇▇▆▂▅█▆▃▇█▆▂▇▇▆▂▅▇62.319.670.469.753.025.761.374.432.314.744.270.063.026.065.562.531.810.651.952.89.6-65.059.785.193.0-34.197.788.755.3-32.952.0118.557.2-14.079.2111.262.7-33.182.397.868.2-36.149.185.1NA
us-gaap:NetIncomeLoss █▇▇▇▇▁▇█▇▇▇█▇▇▇▇▇▇▇█▇▆▆▇▇▇▆▇▇▇▆▇▇▆▆█▇▇▆▇▇▇▆▇▇55.135.422.854.050.3-226.247.773.254.539.134.676.247.327.833.749.441.330.427.170.616.9-9.9-13.831.829.646.6-3.631.618.916.910.850.429.93.08.462.941.818.28.552.537.913.5-21.024.626.8
us-gaap:ShareBasedCompensation ▅▃▃▁▄▁▄▅▃▂█▆▄▄▃▅▄▄▄▄▆▄▃▆▅▇▄▃▄█▅▆▆█▅▆▆▇▄▄▄▅▃▂3.22.32.10.92.90.92.43.02.31.84.83.92.72.62.13.02.62.52.82.94.12.62.23.63.44.22.52.32.85.13.23.93.75.13.54.13.84.22.62.52.93.11.91.6NA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
us-gaap:NetCashProvidedByUsedInInvestingActivities ▃▂▁▁▃▃▂▂▃▂▃█▃▃▂▃▃▂▂▃▃▂▂▂▂▃▂▂▂▂▂▂▂▂▂▂▂▂▃▂▂▃▂▃2.0-8.8-88.9-62.50.49.9-18.2-39.36.4-38.023.7287.2-7.15.8-12.9-0.6-3.2-37.5-10.1-3.06.4-10.3-56.2-21.0-16.2-8.1-52.4-29.1-45.8-22.0-59.4-23.9-25.2-37.3-30.5-19.2-26.7-15.524.0-19.7-14.9-7.8-37.1-6.6NA
us-gaap:PaymentsToAcquireProductiveAssets ▂▂▃▂▁▂▃▂▂▂▄▂▂▁▃▂▂▃▃▃▃▃█▅▃▃█▅▇▅█▅▄▆█▅▅▄▆▅▃▂▅▂17.513.222.414.56.512.027.316.912.314.831.215.115.410.226.518.419.525.328.522.324.928.574.040.530.026.271.848.262.040.973.847.540.152.373.148.343.034.458.842.130.419.340.520.4NA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
us-gaap:NetCashProvidedByUsedInFinancingActivities ▅▅▆▆▅▆▅▄▅▅▅▄▅▅▆▅▅▅▅▆▅▅▆▆▆▆▆▅▆▆▆▃▆▆▆▆▁█▆▆▆▅▂▆-67.2-26.216.014.2-83.566.8-95.9-186.4-72.7-29.9-66.8-156.7-41.6-64.2-10.5-27.6-28.5-36.1-40.7-5.3-62.8-20.1-8.7-8.6-9.5-5.52.0-60.09.451.94.9-262.3-0.1-6.2-11.0-13.6-498.7249.6-0.2-2.53.2-32.9-381.5-9.3NA
us-gaap:RepaymentsOfLongTermDebt ▁█6.26.3NANANANA35.0766.615.78.18.18.18.28.18.28.18.10.61.30.7411.420.710.710.710.77.47.67.57.61.229.159.21.21026.08.38.22.01.52.62.72.21.6430.112.5NA
us-gaap:PaymentsOfDividends █▇▇▅▆▅▆▁▂▁10.310.110.19.69.99.69.78.68.88.5NANANANANANANANANANANANA0.00.00.01.20.10.00.01.20.40.30.00.73.60.3503.10.1NANANANANANANA
us-gaap:PaymentsForRepurchaseOfCommonStock ▂▁▁▁▁▃▃▃▂▂▃█▃▄▁▁▂▃▃20.010.010.00.00.034.450.133.128.120.050.5151.135.070.05.04.520.950.036.0NANANANANANANANANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30

Weighted Average Number Of Diluted Shares Outstanding

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding


Weighted
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-30
Value4848484848494949515253535354565655555555555555595959595.94e-05595858585858
Percentage of WeightedAverageNumberOfDilutedSharesOutstanding100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Weighted Average Number Of Shares Outstanding Basic

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic


Weighted
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-30
Value4747474748484948505153535354555555555555555454585959585.88e-05585858585757
Percentage of WeightedAverageNumberOfSharesOutstandingBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Earnings Per Share Basic

us-gaap:EarningsPerShareBasic

us-gaap:EarningsPerShareBasic


Earnings
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value1.150.740.471.131.05-4.710.991.51.110.80.71.50.90.530.630.930.770.560.491.270.3-0.18-0.240.570.530.84-0.070.570.340.310.220.860.50.050.141.060.710.310.140.890.640.23-0.360.420.47
Percentage of EarningsPerShareBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Earnings Per Share Diluted

us-gaap:EarningsPerShareDiluted

us-gaap:EarningsPerShareDiluted


Earnings
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value1.140.740.471.131.05-4.710.961.481.090.780.71.460.890.510.620.920.770.560.491.260.3-0.18-0.240.570.530.83-0.070.570.340.30.210.850.50.050.141.050.70.310.150.890.640.23-0.360.420.46
Percentage of EarningsPerShareDiluted100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Income Loss From Continuing Operations Per Basic Share

us-gaap:IncomeLossFromContinuingOperationsPerBasicShare

us-gaap:IncomeLossFromContinuingOperationsPerBasicShare


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-30
Value1.150.780.721.131.03-4.641.071.861.30.750.741.260.910.781.960.820.780.570.521.00.3-0.21-0.190.540.530.070.590.570.380.310.220.950.510.050.151.250.720.320.160.88
Percentage of IncomeLossFromContinuingOperationsPerBasicShare100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Income Loss From Continuing Operations Per Diluted Share

us-gaap:IncomeLossFromContinuingOperationsPerDilutedShare

us-gaap:IncomeLossFromContinuingOperationsPerDilutedShare


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-30
Value1.140.780.721.131.03-4.641.041.831.280.730.741.230.90.761.940.810.770.560.520.990.29-0.21-0.20.540.530.070.580.570.380.30.210.940.510.050.151.240.710.320.170.88
Percentage of IncomeLossFromContinuingOperationsPerDilutedShare100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Comprehensive Income Net Of Tax

us-gaap:ComprehensiveIncomeNetOfTax

us-gaap:ComprehensiveIncomeNetOfTax


Comprehensive
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value564023484748511545042-15.8713139537044443977100.9-16.4304542-137.530232386573910.0-55.5733323-85.1374129-53.053
Percentage of ComprehensiveIncomeNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax20.315.99.819.723.519.420.755.818.417.4-6.627.412.717.325.230.119.614.0-39.723.13.40.2-2.84.67.27.7-31.14.23.33.613.17.95.61.6-9.110.54.73.5-13.14.85.64.3-8.27.3

Cost Of Goods And Services Sold

us-gaap:CostOfGoodsAndServicesSold

us-gaap:CostOfGoodsAndServicesSold


Cost
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value175164155155135157158165168150156162165156-107.0241219216212225222440439480474421334564554479527549542477477507533523522576563524519567554
Percentage of CostOfGoodsAndServicesSold100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax62.565.365.363.066.663.364.159.762.062.265.662.466.768.9-49.9103.097.468.5-213.767.270.977.076.273.075.076.575.577.578.175.679.775.376.776.877.973.175.278.380.274.575.376.580.876.876.5

Gross Profit

us-gaap:GrossProfit

us-gaap:GrossProfit


Gross
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value10487829167918811110391829782702.5110111998510991131137177157129108164155155134179164144135186176144129196184160123172170
Percentage of GrossProfit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax37.534.734.737.033.436.735.940.338.037.834.437.633.331.11.247.449.231.5-86.332.829.123.023.827.025.023.524.522.521.924.420.324.723.323.222.126.924.821.719.825.524.723.519.223.223.5

us-gaap:GrossProfit us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, us-gaap:EquityMethodInvestmentNonconsolidatedInvestee

awi:WorthingtonArmstrongVenture, us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOrGroupOfInvestees


Gross
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value645849494154515658
Percentage of GrossProfit61.667.359.254.261.160.157.850.957.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax23.123.420.520.120.422.120.720.521.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax awi:WorthingtonArmstrongVenture us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOrGroupOfInvestees59.459.70.057.255.057.50.057.055.8

Income Loss From Continuing Operations

us-gaap:IncomeLossFromContinuingOperations

us-gaap:IncomeLossFromContinuingOperations


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-30
Value5537345449-222.65190633636644741104434130285516-7.1-13.91915
Percentage of IncomeLossFromContinuingOperations100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax19.714.914.622.024.4-89.520.932.723.415.015.324.619.118.148.918.618.49.8-28.716.75.3-1.2-2.43.02.4

us-gaap:IncomeLossFromContinuingOperations us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents

us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:AccumulatedDefinedBenefitPlansAdjustment


Income
Period End2020-12-312020-09-302019-12-312019-09-30
Value0.00.7-2.1-1.9
Percentage of IncomeLossFromContinuingOperations0.01.3-4.1-2.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.00.3-0.9-0.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome us-gaap:AccumulatedDefinedBenefitPlansAdjustment0.00.00.00.0

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

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value7449436960-300.159106834947806549356170553463410.5-10.355552345584536188256152994623111836137-38.04549
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax26.519.718.128.230.0-120.724.238.530.620.619.830.926.321.716.526.231.117.6-34.719.013.10.1-1.88.48.74.310.28.06.45.72.811.28.02.44.813.78.94.71.710.78.25.5-5.96.16.8

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest us-gaap:BusinessAcquisition

awi:ArkturaMozAndTurf


Income
Period End2021-06-30
Value3.7
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest5.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax awi:ArkturaMozAndTurf21.1

Income Tax Expense Benefit

us-gaap:IncomeTaxExpenseBenefit

us-gaap:IncomeTaxExpenseBenefit


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value19128.31511-77.58.31619131016178.2-69.41728246.07.724121.1242520132624197.5262511202021132.7302324-17.02022
Percentage of IncomeTaxExpenseBenefit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax6.94.83.56.25.6-31.23.45.87.15.54.56.37.13.6-32.47.612.77.8-6.02.37.92.10.23.84.03.62.93.63.53.01.13.63.71.93.33.03.01.90.44.03.13.5-2.62.83.1

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

us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:AccumulatedGainLossNetCashFlowHedgeParent


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value-0.5-0.4-0.4-0.4-0.3-0.10.00.10.1
Percentage of IncomeTaxExpenseBenefit-2.6-3.3-4.8-2.6-2.60.10.00.60.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-0.2-0.2-0.2-0.2-0.1-0.00.00.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome us-gaap:AccumulatedGainLossNetCashFlowHedgeParent0.00.00.00.00.00.00.00.00.0

Income Taxes Paid Net

us-gaap:IncomeTaxesPaidNet

us-gaap:IncomeTaxesPaidNet


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value177.24.65.20.01.11222203.03118-0.41.811188.4-6.29.8145.83.96.5147.7151.95.95.51.75.62.73.52.62.94.31.7-0.51.81.47.09.7
Percentage of IncomeTaxesPaidNet100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax6.42.91.92.10.00.44.98.27.61.213.27.1-0.20.85.67.73.7-2.0-9.94.21.80.71.12.21.22.80.40.80.80.30.80.40.50.40.50.60.2-0.10.30.20.91.4

Interest Expense

us-gaap:InterestExpense

us-gaap:InterestExpense


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value5.65.75.46.15.96.76.8119.510109.99.89.27.99.19.29.26.49.0122111111111111111111211113314141411101111149.43.94.0
Percentage of InterestExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax2.02.32.32.52.92.72.84.23.54.34.33.83.94.03.73.94.12.9-6.42.74.03.82.01.71.82.02.61.51.71.81.91.61.75.32.32.02.01.71.71.51.52.21.50.50.6

us-gaap:InterestExpense us-gaap:DerivativeInstrumentRisk, us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents

us-gaap:InterestRateSwap, us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:AccumulatedGainLossNetCashFlowHedgeParent


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value2.21.91.91.91.50.30.1-0.5-0.4
Percentage of InterestExpense39.333.335.231.125.44.51.5-4.3-4.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.80.80.80.80.70.10.0-0.2-0.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:InterestRateSwap us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome us-gaap:AccumulatedGainLossNetCashFlowHedgeParent0.00.00.00.00.00.00.00.00.0

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
Value5.45.75.95.65.76.96.27.58.6105.39.37.67.77.67.7
Percentage of InterestPaidNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.92.32.52.32.82.82.52.73.24.52.23.63.13.43.53.3

Net Income Loss

us-gaap:NetIncomeLoss

us-gaap:NetIncomeLoss


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value5535225450-226.2477354393476472733494130277016-9.9-13.8312946-3.63118161050293.08.46241188.5523713-21.02426
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax19.714.19.621.924.8-91.019.326.420.016.214.529.319.012.215.721.118.39.6-27.321.15.4-1.7-2.44.84.78.5-0.84.32.72.71.66.94.20.51.49.15.92.71.36.85.12.0-3.33.33.7

us-gaap:NetIncomeLoss us-gaap:BusinessAcquisition

awi:ArkturaMozAndTurf


Net
Period End2021-03-31
Value5.7
Percentage of NetIncomeLoss16.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax2.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax awi:ArkturaMozAndTurf34.5

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

us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:AccumulatedGainLossNetCashFlowHedgeParent


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value1.71.51.51.51.20.20.1-0.4-0.3
Percentage of NetIncomeLoss3.14.26.62.82.4-0.10.2-0.5-0.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.60.60.60.60.60.10.0-0.1-0.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome us-gaap:AccumulatedGainLossNetCashFlowHedgeParent0.00.00.00.00.00.00.00.00.0

us-gaap:NetIncomeLoss us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, us-gaap:EquityMethodInvestmentNonconsolidatedInvestee

awi:WorthingtonArmstrongVenture, us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOrGroupOfInvestees


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value494434332940384343
Percentage of NetIncomeLoss89.8126.0151.361.957.9-18.081.160.079.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax17.717.714.513.614.316.415.715.815.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax awi:WorthingtonArmstrongVenture us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOrGroupOfInvestees45.545.20.038.738.642.80.043.940.9

us-gaap:NetIncomeLoss us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value5535225450-226.2477354393476472733494130277016-9.9-13.8312946-3.63118161050293.08.46241188.5523713-21.024
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax19.714.19.621.924.8-91.019.326.420.016.214.529.319.012.215.721.118.39.6-27.321.15.4-1.7-2.44.84.78.5-0.84.32.72.71.66.94.20.51.49.15.92.71.36.85.12.0-3.33.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Nonoperating Income Expense

us-gaap:NonoperatingIncomeExpense

us-gaap:NonoperatingIncomeExpense


Nonoperating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value1.61.37193.24.4-369.44.45.15.45.55.29.29.19.0-2.5-12.38.38.9
Percentage of NonoperatingIncomeExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.60.5301.31.32.2-148.51.81.82.02.32.23.53.74.0-1.2-5.33.72.8

Operating Income Loss

us-gaap:OperatingIncomeLoss

us-gaap:OperatingIncomeLoss


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value7854447262766211387545281664944697863407151188.8796335596957523093674742108764121927252-30.24552
Percentage of OperatingIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax28.021.518.529.430.730.625.240.932.122.622.031.226.521.820.929.534.820.0-40.621.216.43.21.512.110.06.513.59.58.18.34.612.89.67.66.915.610.86.23.312.09.77.6-4.76.17.3

us-gaap:OperatingIncomeLoss us-gaap:ConsolidationItems

us-gaap:CorporateNonSegment


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-30
Value-1.2-1.6-2.3000000000000025.112-1.5-2.5-1.8-1.7-2.1-2.4-1.8-2.1-2.48.4-6.9-3.0-3.0-1.7-2.7-5.2-29.2-45.1-30.5-23.0
Percentage of OperatingIncomeLoss-1.5-3.0-5.27.120.0-2.0-4.0-1.6-1.9-3.8-4.6-2.2-3.2-4.818.8-10.0-3.8-4.8-4.2-3.8-10.1-159.6-512.5-38.3-36.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-0.4-0.6-1.02.16.2-0.6-1.0-0.6-0.6-0.9-1.0-0.7-0.8-1.13.9-2.9-1.3-1.01.7-0.8-1.7-5.1-7.8-4.6-3.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:CorporateNonSegment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingIncomeLoss us-gaap:StatementBusinessSegments

awi:ArchitecturalSpecialties


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value7.4-4.91.49.14.37.55.6119.59.26.1118.68.37.17.78.14.8
Percentage of OperatingIncomeLoss9.5-9.13.212.66.99.99.010.210.916.811.613.913.016.715.911.210.37.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax2.6-1.90.63.72.13.02.34.23.53.82.64.33.53.73.33.33.61.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax awi:ArchitecturalSpecialties10.3-7.80.015.49.514.70.019.816.420.30.023.720.522.70.022.122.816.0

awi:MineralFiber


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value7260455845705910379474871594339736455
Percentage of OperatingIncomeLoss92.1112.0102.080.473.192.195.091.491.187.093.088.390.288.187.7105.981.888.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax25.824.118.923.622.428.123.937.429.219.720.427.623.919.218.331.328.417.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax awi:MineralFiber34.632.10.031.028.935.40.047.337.124.20.033.728.822.90.036.733.729.2

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

us-gaap:OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax

us-gaap:OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value0.50.61.099999999999999-6.20.1-2.1-0.5780.75.3-5.7-7.0-20.85.93.67.02.811-19.4-2.0-13.21.4-4.2-13.47.4-15.3-19.6-14.14.5-0.4-0.16.2-8.7-6.2-0.110-8.65.3-3.7-13.34.011
Percentage of OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.20.20.5-2.50.0-0.8-0.228.40.32.2-2.4-2.7-8.42.61.73.01.23.519.5-0.6-4.20.2-0.7-2.01.2-2.8-4.4-1.90.6-0.1-0.00.8-1.2-1.0-0.01.5-1.20.8-0.6-1.70.51.7

Other Comprehensive Income Loss Net Of Tax

us-gaap:OtherComprehensiveIncomeLossNetOfTax

us-gaap:OtherComprehensiveIncomeLossNetOfTax


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value1.84.60.5-5.5-2.62743.581-4.53.0-50.4-4.8-15.71120213.013126.6-6.110-2.6-1.416-3.9-133.9-0.74.66.1757.49.57.0-63.910-8.15.4-93.6-15.23.715
Percentage of OtherComprehensiveIncomeLossNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.61.80.2-2.2-1.3110.31.429.4-1.71.2-21.1-1.8-6.35.19.49.01.34.3-12.42.0-1.91.9-0.5-0.22.5-0.7-30.3-0.10.61.011.51.01.31.1-10.41.5-1.10.8-14.4-2.00.52.3

us-gaap:OtherComprehensiveIncomeLossNetOfTax us-gaap:StatementEquityComponents

us-gaap:AccumulatedOtherComprehensiveIncome


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value1.84.60.5-5.5-2.62743.581-4.53.0-50.4-4.8-15.71120213.013126.6-6.110-2.6-1.416-3.9-133.9-0.74.66.1757.49.57.0-63.910-8.15.4-93.6-15.23.715
Percentage of OtherComprehensiveIncomeLossNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.61.80.2-2.2-1.3110.31.429.4-1.71.2-21.1-1.8-6.35.19.49.01.34.3-12.42.0-1.91.9-0.5-0.22.5-0.7-30.3-0.10.61.011.51.01.31.1-10.41.5-1.10.8-14.4-2.00.52.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Other Nonoperating Income Expense

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

us-gaap:OtherNonoperatingIncomeExpense

us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, awi:AccumulatedDefinedBenefitPlansAdjustmentNetSettlementGainLoss


Other
Period End2020-12-312020-09-302020-06-302020-03-31
Value0.00.00.0-374.4
Percentage of OtherNonoperatingIncomeExpense0.00.00.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.00.00.0-150.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome awi:AccumulatedDefinedBenefitPlansAdjustmentNetSettlementGainLoss0.00.00.00.0

us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:AccumulatedDefinedBenefitPlansAdjustmentNetGainLossIncludingPortionAttributableToNoncontrollingInterest


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value-0.3-0.40.80.90.9-2.3-2.7-2.7-2.7-2.7
Percentage of OtherNonoperatingIncomeExpense0.00.00.00.00.00.60.00.00.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-0.1-0.20.30.40.4-0.9-1.1-1.0-1.0-1.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome us-gaap:AccumulatedDefinedBenefitPlansAdjustmentNetGainLossIncludingPortionAttributableToNoncontrollingInterest0.00.00.00.00.00.00.00.00.00.0

us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:AccumulatedDefinedBenefitPlansAdjustmentNetPriorServiceCostCredit


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302018-12-312017-12-31
Value0.00.10.10.10.00.10.3-0.1-0.40.4
Percentage of OtherNonoperatingIncomeExpense0.00.00.00.00.0-0.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.00.00.00.00.00.00.1-0.0-0.20.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome us-gaap:AccumulatedDefinedBenefitPlansAdjustmentNetPriorServiceCostCredit0.00.00.00.00.00.00.00.00.00.0

Revenue From Contract With Customer Excluding Assessed Tax

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value280251238246203248246277272242238260248227214233225315-99.3334314571577658632551442728710634661729706622612694709668652773748685642739724
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:BusinessAcquisition

awi:ArkturaMozAndTurf


Revenue
Period End2021-06-302021-03-31
Value1716
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax6.26.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax6.26.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax awi:ArkturaMozAndTurf100.0100.0

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:MajorCustomers, us-gaap:StatementBusinessSegments

awi:DirectCustomers, awi:ArchitecturalSpecialties


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value3028232312141916191310107.57.94.45.86.55.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax11.011.29.89.36.15.87.86.07.05.44.44.13.03.52.12.52.91.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax11.011.29.89.36.15.87.86.07.05.44.44.13.03.52.12.52.91.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax awi:DirectCustomers awi:ArchitecturalSpecialties100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

awi:DirectCustomers, awi:MineralFiber


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value151212131413131517141415161314151616
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax5.45.15.25.67.05.65.65.76.45.86.06.06.86.06.86.87.45.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax5.45.15.25.67.05.65.65.76.45.86.06.06.86.06.86.87.45.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax awi:DirectCustomers awi:MineralFiber100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

awi:Distributors, awi:ArchitecturalSpecialties


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value403431363235293937313334332831282823
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax14.413.613.214.615.714.412.114.313.713.014.113.213.412.514.712.212.47.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax14.413.613.214.615.714.412.114.313.713.014.113.213.412.514.712.212.47.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax awi:Distributors awi:ArchitecturalSpecialties100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

awi:Distributors, awi:MineralFiber


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value156135130138114141148168161144142164156137133152141140
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax56.053.754.556.356.457.160.360.659.359.759.563.363.060.662.265.162.844.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax56.053.754.556.356.457.160.360.659.359.759.563.363.060.662.265.162.844.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax awi:Distributors awi:MineralFiber100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

awi:HomeCenters, awi:MineralFiber


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value2126282219252020212321182024191818
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax7.610.611.99.19.510.38.57.27.89.59.06.98.210.68.98.08.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax7.610.611.99.19.510.38.57.27.89.59.06.98.210.68.98.08.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax awi:HomeCenters awi:MineralFiber100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

awi:RetailersAndOther, awi:ArchitecturalSpecialties


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value0.80.80.50.00.90.70.72.11.60.83.32.61.00.30.80.61.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.30.30.20.00.40.30.30.80.60.31.41.00.40.10.40.30.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.30.30.20.00.40.30.30.80.60.31.41.00.40.10.40.30.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax awi:RetailersAndOther awi:ArchitecturalSpecialties100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

awi:RetailersAndOther, awi:MineralFiber


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value141312129.7161314141413141215101213
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax5.35.55.15.04.86.55.55.35.16.25.75.55.16.74.95.25.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax5.35.55.15.04.86.55.55.35.16.25.75.55.16.74.95.25.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax awi:RetailersAndOther awi:MineralFiber100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, us-gaap:EquityMethodInvestmentNonconsolidatedInvestee

awi:WorthingtonArmstrongVenture, us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOrGroupOfInvestees


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value10898868675959099105
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax38.839.136.235.037.138.436.836.138.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax38.839.136.235.037.138.436.836.138.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax awi:WorthingtonArmstrongVenture us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOrGroupOfInvestees100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:StatementBusinessSegments

awi:ArchitecturalSpecialties


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value716355594551495857454747413636343530
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax25.725.123.324.022.320.520.121.121.318.819.918.316.916.117.214.915.79.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax25.725.123.324.022.320.520.121.121.318.819.918.316.916.117.214.915.79.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax awi:ArchitecturalSpecialties100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

awi:MineralFiber


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value208188183187157197197218214196191212206190177199190189
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax74.374.976.776.077.779.579.978.978.781.280.181.783.183.982.885.184.360.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax74.374.976.776.077.779.579.978.978.781.280.181.783.183.982.885.184.360.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax awi:MineralFiber100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Selling General And Administrative Expense

us-gaap:SellingGeneralAndAdministrativeExpense

us-gaap:SellingGeneralAndAdministrativeExpense


Selling
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value6054544133344041375545354037-27.15552546055551041271101061035211411411711610311111210594114116117118122120130125131
Percentage of SellingGeneralAndAdministrativeExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax21.421.622.816.616.214.016.214.913.823.019.013.616.516.5-12.623.923.217.3-60.416.617.818.222.116.816.818.711.915.716.218.517.714.115.718.117.213.516.117.518.015.416.317.520.316.918.2

Assets

us-gaap:Assets

us-gaap:Assets


Assets
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value171617151718163315441590149315091890194218732002182418251873182917841757175817321697262526912694265725732606300630582991291628142961286928542885280332622994311830712922
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:Assets us-gaap:ConsolidationItems

us-gaap:CorporateNonSegment


Assetsus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312017-09-302017-06-302017-03-312016-12-31
Value2422432592642672871911248891150
Percentage of Assets14.114.215.116.217.318.112.86.84.95.28.6
Percentage of Assets14.114.215.116.217.318.112.86.84.95.28.6
Percentage of Assets us-gaap:CorporateNonSegment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:Assets us-gaap:StatementBusinessSegments

awi:ArchitecturalSpecialties


Assetsus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-31
Value358354357258156161161
Percentage of Assets20.920.720.815.810.110.110.8
Percentage of Assets20.920.720.815.810.110.110.8
Percentage of Assets awi:ArchitecturalSpecialties100.0100.0100.0100.0100.0100.0100.0

awi:MineralFiber


Assetsus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-31
Value1115111611011110112011411139
Percentage of Assets65.065.164.168.072.571.876.3
Percentage of Assets65.065.164.168.072.571.876.3
Percentage of Assets awi:MineralFiber100.0100.0100.0100.0100.0100.0100.0

Liabilities And Stockholders Equity

us-gaap:LiabilitiesAndStockholdersEquity

us-gaap:LiabilitiesAndStockholdersEquity


Liabilities
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value171617151718163315441590149315091890194218732002182418251873182917841757175817321697262526912694265725732606300630582991291628142961286928542885280332622994311830712922
Percentage of LiabilitiesAndStockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Stockholders Equity

us-gaap:StockholdersEquity

us-gaap:StockholdersEquity


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-312010-09-302010-06-302009-12-31
Value4984734504424023703643672432802613304044034193662972712662592027707687837476976497767387106735797787347197726956571130121211721090193818821907
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets29.027.626.227.126.123.324.424.312.914.413.916.522.122.122.420.016.715.415.215.011.929.328.629.128.127.124.925.824.123.723.120.626.325.625.226.824.820.137.738.938.237.30.00.00.0

us-gaap:StockholdersEquity us-gaap:StatementEquityComponents

us-gaap:AccumulatedDefinedBenefitPlansAdjustment


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302014-12-31
Value-92.2-92.4-92.6-90.2-89.4-88.7-377.0-379.0-384.5-387.4-390.2-349.7-352.4-355.5-302.3-317.2-331.5-333.5-336.0-364.6-371.5-442.5-450.3-451.0-483.2
Percentage of StockholdersEquity-18.5-19.5-20.5-20.4-22.2-23.9-103.3-103.2-158.2-138.2-149.4-105.7-87.2-88.0-72.1-86.6-111.5-123.0-126.1-140.7-183.5-57.4-58.6-57.6-74.4
Percentage of Assets-5.4-5.4-5.4-5.5-5.8-5.6-25.2-25.1-20.3-19.9-20.8-17.5-19.3-19.5-16.1-17.3-18.6-19.0-19.1-21.0-21.9-16.9-16.7-16.7-18.5
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 End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-31
Value-14.1-15.2-19.0-20.8-22.3-20.3-8.5-10.5-7.80.35.33.5
Percentage of StockholdersEquity-2.8-3.2-4.2-4.7-5.5-5.5-2.3-2.9-3.20.12.00.8
Percentage of Assets-0.8-0.9-1.1-1.3-1.4-1.3-0.6-0.7-0.40.00.30.2
Percentage of Assets us-gaap:AccumulatedGainLossNetCashFlowHedgeParent0.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedOtherComprehensiveIncome


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312013-12-312012-12-31
Value-102.9-104.7-109.3-109.8-104.3-101.7-376.1-379.6-461.0-456.5-459.6-409.2-404.4-388.7-345.9-366.1-387.1-390.1-403.8-419.3-425.9-476.6-487.4-484.8-483.4-499.4-495.5-371.6-471.4
Percentage of StockholdersEquity-20.7-22.1-24.2-24.8-25.9-27.5-103.1-103.3-189.6-162.9-176.0-123.7-100.1-96.3-82.5-100.0-130.2-143.8-151.6-161.8-210.4-61.9-63.4-61.9-64.7-71.6-76.3-55.2-65.6
Percentage of Assets-6.0-6.1-6.4-6.7-6.8-6.4-25.2-25.1-24.4-23.5-24.5-20.4-22.2-21.3-18.5-20.0-21.7-22.2-23.0-24.2-25.1-18.1-18.1-18.0-18.2-19.4-19.0-12.7-16.5
Percentage of Assets us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedTranslationAdjustment


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302014-12-31
Value3.42.92.31.27.47.39.49.9-68.7-69.4-74.7-69.0-62.0-41.2-47.1-50.7-57.7-60.5-71.6-52.2-50.2-32.4-33.8-29.6-8.3
Percentage of StockholdersEquity0.70.60.50.31.82.02.62.7-28.3-24.8-28.6-20.9-15.3-10.2-11.2-13.8-19.4-22.3-26.9-20.1-24.8-4.2-4.4-3.8-1.3
Percentage of Assets0.20.20.10.10.50.50.60.7-3.6-3.6-4.0-3.4-3.4-2.3-2.5-2.8-3.2-3.4-4.1-3.0-3.0-1.2-1.3-1.1-0.3
Percentage of Assets us-gaap:AccumulatedTranslationAdjustment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AdditionalPaidInCapital


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312013-12-312012-12-31
Value55455655355255155755554953855354751253553251651250950650450451611521151114911441139113410981076
Percentage of StockholdersEquity111.3117.5122.8124.9136.9150.5152.3149.6221.3197.4209.6154.8132.6131.7123.3140.0171.4186.9189.5194.6255.4149.6149.8146.8153.1163.5174.8163.2149.7
Percentage of Assets32.332.432.233.835.735.037.236.428.528.529.225.629.429.127.628.028.628.828.729.130.543.942.842.743.144.343.537.737.7
Percentage of Assets us-gaap:AdditionalPaidInCapital0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:RetainedEarnings


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312013-12-312012-12-31
Value9398958698578127721008970905895865839762715633599550509469442372355365379347317271207113
Percentage of StockholdersEquity188.6189.0192.9193.7201.7208.5276.3264.2372.6319.3331.2253.6188.8177.2151.1163.8185.1187.7176.4170.9183.946.147.548.446.545.641.830.815.7
Percentage of Assets54.752.250.652.552.648.667.564.347.946.146.241.941.839.233.832.830.829.026.725.621.913.513.614.113.112.310.47.14.0
Percentage of Assets us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:TreasuryStock


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312013-12-31
Value-893.9-873.9-863.9-857.9-857.9-857.9-823.5-773.4-740.3-712.2-692.2-611.7-490.6-455.6-385.6-380.6-376.1-355.2-305.2-269.2-261.4-261.4-261.4-261.4-261.4-261.4-261.4-261.4
Percentage of StockholdersEquity-179.4-184.5-191.6-193.8-212.9-231.6-225.7-210.6-304.5-254.1-265.0-184.9-121.4-112.8-92.0-103.9-126.5-131.0-114.6-103.9-129.2-33.9-34.0-33.4-35.0-37.5-40.3-38.8
Percentage of Assets-52.1-50.9-50.3-52.5-55.6-53.9-55.1-51.2-39.2-36.7-36.9-30.5-26.9-25.0-20.6-20.8-21.1-20.2-17.4-15.5-15.4-10.0-9.7-9.7-9.8-10.2-10.0-9.0
Percentage of Assets us-gaap:TreasuryStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Assets Current

us-gaap:AssetsCurrent

us-gaap:AssetsCurrent


Assets
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value317316311323320345244296695749752780583599648407362353406428390816880887860791811933981953884906108410251019105099314681209118311471020
Percentage of AssetsCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets18.518.418.119.820.721.716.419.736.838.640.239.032.032.834.622.320.320.123.124.723.031.132.732.932.430.831.131.132.131.930.332.236.635.735.736.435.445.040.438.037.434.9

us-gaap:AssetsCurrent us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, us-gaap:EquityMethodInvestmentNonconsolidatedInvestee

awi:WorthingtonArmstrongVenture, us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOrGroupOfInvestees


Assets
Period End2020-12-312019-12-31
Value6699
Percentage of AssetsCurrent21.440.6
Percentage of Assets3.96.6
Percentage of Assets awi:WorthingtonArmstrongVenture us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOrGroupOfInvestees0.00.0

Cash And Cash Equivalents At Carrying Value

us-gaap:CashAndCashEquivalentsAtCarryingValue

us-gaap:CashAndCashEquivalentsAtCarryingValue


Cash
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302009-12-312008-12-31
Value1191211361381171464598240273325327129116159116798114114299149244250201132185148152131135137304278480298217683480376304244315682599569355
Percentage of CashAndCashEquivalentsAtCarryingValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets6.97.18.08.57.69.23.06.512.714.117.416.37.16.48.56.44.54.68.18.25.95.79.19.37.65.17.14.95.04.44.64.910.39.716.810.37.820.916.012.19.90.010.80.00.00.00.0

Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents


Cash
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-312016-12-31
Value1191211361381171464598240273325327159141
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets6.97.18.08.57.69.23.06.512.714.117.416.38.58.1

Receivables Net Current

us-gaap:ReceivablesNetCurrent

us-gaap:ReceivablesNetCurrent


Receivables
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value9291789010696858896857981817190142140127108128126213184207220215195252276244222260275237204255281269232294309229
Percentage of ReceivablesNetCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets5.45.34.65.56.96.15.75.95.14.44.34.14.53.94.87.87.97.26.27.47.58.16.87.78.38.47.58.49.18.27.69.39.38.37.28.810.08.37.89.410.17.9

Inventory Net

us-gaap:InventoryNet

us-gaap:InventoryNet


Inventory
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value838181777468686970726163616053117116116109109104345344340349351335415426428381384387395369380403403388426437398
Percentage of InventoryNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets4.84.84.74.74.84.34.64.63.73.73.33.23.43.32.96.46.66.66.26.36.113.212.812.613.113.712.913.814.014.313.113.713.113.813.013.214.412.413.013.714.313.6

Inventory Finished Goods

us-gaap:InventoryFinishedGoods

us-gaap:InventoryFinishedGoods


Inventory
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302011-12-31
Value464544434339403940403838393833828584808175216202211242250243307317317292289284281265277292271
Percentage of InventoryFinishedGoods100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets2.72.62.62.62.82.52.72.62.12.12.11.92.12.11.84.54.84.84.64.74.48.27.57.99.19.79.310.210.410.610.010.39.69.89.39.610.49.1

Inventory L I F O Reserve

us-gaap:InventoryLIFOReserve

us-gaap:InventoryLIFOReserve


Inventory
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302016-12-31
Value121110101110101010109.89.79.78.88.27.98.07.2
Percentage of InventoryLIFOReserve100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.70.70.60.70.70.70.70.70.60.50.50.50.50.50.40.40.40.4

Inventory Raw Materials And Supplies

us-gaap:InventoryRawMaterialsAndSupplies

us-gaap:InventoryRawMaterialsAndSupplies


Inventory
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302011-12-31
Value434242403735353435372729282726393534323333127138139140138133143137133118117122128107106118118
Percentage of InventoryRawMaterialsAndSupplies100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets2.52.52.52.52.42.22.32.31.91.91.51.51.61.51.42.12.02.01.81.92.04.95.15.25.35.45.14.84.54.54.14.24.14.53.83.74.23.9

Other Assets Current

us-gaap:OtherAssetsCurrent

us-gaap:OtherAssetsCurrent


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value20191211111515146.78.24.88.56.98.47.9231719201720656069605758595666555152464240464838415035
Percentage of OtherAssetsCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.21.10.70.70.71.01.00.90.40.40.30.40.40.50.41.31.01.11.21.01.22.52.32.62.32.22.32.01.82.21.91.81.81.61.51.41.71.51.31.31.61.2

Land

us-gaap:Land

us-gaap:Land


Land
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-31
Value33323232387273
Percentage of Land100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.92.21.71.72.22.72.8

Machinery And Equipment Gross

us-gaap:MachineryAndEquipmentGross

us-gaap:MachineryAndEquipmentGross


Machinery
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-31
Value64562457553770612031098
Percentage of MachineryAndEquipmentGross100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets37.641.830.728.740.244.742.1

Assets Noncurrent

us-gaap:AssetsNoncurrent us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, us-gaap:EquityMethodInvestmentNonconsolidatedInvestee

us-gaap:AssetsNoncurrent

awi:WorthingtonArmstrongVenture, us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOrGroupOfInvestees


Assets
Period End2020-12-312019-12-31
Value4037
Percentage of AssetsNoncurrent100.0100.0
Percentage of Assets2.42.5
Percentage of Assets awi:WorthingtonArmstrongVenture us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOrGroupOfInvestees0.00.0

Construction In Progress Gross

us-gaap:ConstructionInProgressGross

us-gaap:ConstructionInProgressGross


Construction
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-31
Value4041494690134143
Percentage of ConstructionInProgressGross100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets2.42.82.72.55.25.05.5

Accumulated Depreciation Depletion And Amortization Property Plant And Equipment

us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment

us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment


Accumulated
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value471452487491474460447439432421412406396375361497489469445444430739718709687661644721691663639615613592583566548538506514526482
Percentage of AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets27.426.428.330.130.729.030.029.122.921.722.020.321.720.619.327.227.426.725.325.725.328.226.726.325.925.724.724.022.622.221.921.920.720.620.519.619.516.516.916.517.116.5

Amortization Of Intangible Assets

us-gaap:AmortizationOfIntangibleAssets

us-gaap:AmortizationOfIntangibleAssets


Amortization
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-30
Value10106.76.14.74.65.25.25.63.94.13.73.73.63.63.73.73.63.53.53.43.63.63.63.83.63.63.73.63.63.63.63.63.63.63.33.73.53.53.4
Percentage of AmortizationOfIntangibleAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Property Plant And Equipment Net

us-gaap:PropertyPlantAndEquipmentNet

us-gaap:PropertyPlantAndEquipmentNet


Property
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value52752352951451452152450851151050148448448949969969668966966466111001096106710681053106211281142111311071058103610131005937918906902861855854
Percentage of PropertyPlantAndEquipmentNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets30.730.530.831.533.332.835.133.727.126.326.724.226.626.826.738.239.039.238.138.439.041.940.739.640.240.940.837.537.437.238.037.635.035.335.232.532.827.830.127.627.929.3

us-gaap:PropertyPlantAndEquipmentNet us-gaap:StatementBusinessSegments

awi:ArchitecturalSpecialties


Property
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value4328107.54.3
Percentage of PropertyPlantAndEquipmentNet8.35.32.11.50.6
Percentage of Assets2.61.90.60.40.2
Percentage of Assets awi:ArchitecturalSpecialties12.317.30.00.00.0

awi:MineralFiber


Property
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value486496487488457
Percentage of PropertyPlantAndEquipmentNet91.794.797.397.868.3
Percentage of Assets28.333.326.026.126.0
Percentage of Assets awi:MineralFiber44.143.60.00.00.0

us-gaap:PropertyPlantAndEquipmentNet us-gaap:StatementGeographical, us-gaap:StatementBusinessSegments

country:US, awi:ArchitecturalSpecialties


Property
Period End2020-12-312019-12-312018-12-312017-12-31
Value38225.93.0
Percentage of PropertyPlantAndEquipmentNet7.24.21.20.6
Percentage of Assets2.21.50.30.2
Percentage of Assets country:US awi:ArchitecturalSpecialties0.00.00.00.0

country:US, awi:MineralFiber


Property
Period End2020-12-312019-12-312018-12-312017-12-31
Value486496487488
Percentage of PropertyPlantAndEquipmentNet91.794.797.397.8
Percentage of Assets28.333.326.026.1
Percentage of Assets country:US awi:MineralFiber0.00.00.00.0

stpr:CA, awi:ArchitecturalSpecialties


Property
Period End2020-12-312019-12-312018-12-31
Value5.75.84.5
Percentage of PropertyPlantAndEquipmentNet1.11.10.9
Percentage of Assets0.30.40.2
Percentage of Assets stpr:CA awi:ArchitecturalSpecialties0.00.00.0

Investments In Affiliates Subsidiaries Associates And Joint Ventures

us-gaap:InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures

us-gaap:InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures


Investments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value504641444859586541384077111107107105109105106119119131130130130127129132132128132133133134133136135137141195194188
Percentage of InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets2.92.72.42.73.13.83.94.42.22.02.23.96.15.95.75.86.16.06.06.97.05.04.94.94.94.94.94.44.34.34.54.74.54.74.74.74.84.24.76.36.36.5

us-gaap:InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures us-gaap:StatementBusinessSegments

awi:MineralFiber


Investments
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-31
Value415840107106130
Percentage of InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures100.0100.0100.0100.0100.0100.0
Percentage of Assets2.43.92.25.76.04.9
Percentage of Assets awi:MineralFiber3.75.10.00.00.00.0

Goodwill

us-gaap:Goodwill

us-gaap:Goodwill


Goodwill
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-31
Value16616616010853535342404019191611111010101.1
Percentage of Goodwill100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets9.79.79.46.63.53.33.52.82.22.11.01.00.90.60.60.60.60.60.1

us-gaap:Goodwill us-gaap:BusinessAcquisition

awi:ArkturaLLC


Goodwillus-gaap:
Period End2020-12-16
Value51
Percentage of Goodwill0.0
Percentage of Assets0.0
Percentage of Assets awi:ArkturaLLC0.0

awi:MozDesignsInc


Goodwillus-gaap:
Period End2020-08-24
Value4.0
Percentage of Goodwill0.0
Percentage of Assets0.0
Percentage of Assets awi:MozDesignsInc0.0

awi:TURFDesignInc


Goodwillus-gaap:
Period End2020-07-27
Value50
Percentage of Goodwill0.0
Percentage of Assets0.0
Percentage of Assets awi:TURFDesignInc0.0

Indefinite Lived Intangible Assets Excluding Goodwill

us-gaap:IndefiniteLivedIntangibleAssetsExcludingGoodwill

us-gaap:IndefiniteLivedIntangibleAssetsExcludingGoodwill


Indefinite
Period End2021-06-302021-03-312020-12-312019-12-31
Value344344347321
Percentage of IndefiniteLivedIntangibleAssetsExcludingGoodwill100.0100.0100.0100.0
Percentage of Assets20.120.120.221.5

us-gaap:IndefiniteLivedIntangibleAssetsExcludingGoodwill us-gaap:IndefiniteLivedIntangibleAssetsByMajorClass

us-gaap:TrademarksAndTradeNames


Indefinite
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-31
Value332321321321321321321321321319319319319319319314314314313
Percentage of IndefiniteLivedIntangibleAssetsExcludingGoodwill0.00.00.0100.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets20.420.820.221.521.317.016.517.116.017.517.517.117.517.918.217.918.118.511.6
Percentage of Assets us-gaap:TrademarksAndTradeNames0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Intangible Assets Net Excluding Goodwill

us-gaap:IntangibleAssetsNetExcludingGoodwill

us-gaap:IntangibleAssetsNetExcludingGoodwill


Intangible
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312018-12-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302014-12-31
Value434444457428402407411422433437440486489493501
Percentage of IntangibleAssetsNetExcludingGoodwill100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets25.325.926.626.226.125.627.622.624.725.226.018.518.218.319.2

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
Value2020192034343535302829
Percentage of OperatingLeaseRightOfUseAsset100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.21.21.11.22.22.22.42.31.61.50.0

Other Assets Noncurrent

us-gaap:OtherAssetsNoncurrent

us-gaap:OtherAssetsNoncurrent


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value5958575686875759606468726968646464646460636162686668677371737381858093100989790939396
Percentage of OtherAssetsNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets3.53.43.43.55.65.53.93.93.23.33.73.63.83.83.43.53.63.73.73.53.72.32.32.52.52.62.62.52.32.42.52.92.92.83.33.53.53.03.03.03.03.3

Accounts Payable And Accrued Liabilities Current

us-gaap:AccountsPayableAndAccruedLiabilitiesCurrent

us-gaap:AccountsPayableAndAccruedLiabilitiesCurrent


Accounts
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value14011513610010712714814137839038336610392108169163172197201202348380367361325345399414379383399383346346345347342359378385340
Percentage of AccountsPayableAndAccruedLiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets8.26.77.96.26.98.010.09.420.020.120.518.35.75.15.89.39.29.811.211.611.913.314.113.613.612.613.313.313.612.713.214.212.912.112.112.012.410.512.012.112.511.6

Accrued Income Taxes Current

us-gaap:AccruedIncomeTaxesCurrent

us-gaap:AccruedIncomeTaxesCurrent


Accrued
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
Value5.28.54.00.31.00.30.20.46.47.20.91.91.21.60.53.64.51.22.0119.64.43.24.82.92.02.54.53.42.92.76.94.02.64.18.1118.54.04.9
Percentage of AccruedIncomeTaxesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.30.50.20.00.10.00.00.00.30.40.00.10.10.10.00.20.30.10.10.60.60.20.10.20.10.10.10.10.10.10.10.20.10.10.10.30.40.30.10.2

Liabilities Current

us-gaap:LiabilitiesCurrent

us-gaap:LiabilitiesCurrent


Liabilities
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value177156172132156169155142581589549533259245269205215221224230222405436421410370388441509456410425399354384404407890386394395382
Percentage of LiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets10.39.110.08.110.210.710.49.430.830.429.326.614.213.414.411.312.112.612.713.313.115.516.215.615.514.414.914.716.715.214.115.113.512.413.514.014.527.312.912.612.913.1

us-gaap:LiabilitiesCurrent us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, us-gaap:EquityMethodInvestmentNonconsolidatedInvestee

awi:WorthingtonArmstrongVenture, us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOrGroupOfInvestees


Liabilities
Period End2020-12-312019-12-31
Value7324
Percentage of LiabilitiesCurrent42.415.7
Percentage of Assets4.21.6
Percentage of Assets awi:WorthingtonArmstrongVenture us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOrGroupOfInvestees0.00.0

Long Term Debt Current

us-gaap:LongTermDebtCurrent

us-gaap:LongTermDebtCurrent


Long
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value2525252518126.362625547403232323232251710.05252494542393633302317114.83334342818128.010
Percentage of LongTermDebtCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.51.51.51.51.20.80.43.33.22.92.42.21.81.71.81.81.81.41.00.62.01.91.81.71.71.51.21.11.00.80.60.40.21.21.21.20.90.60.40.30.4

us-gaap:LongTermDebtCurrent us-gaap:ExtinguishmentOfDebt

us-gaap:ShortTermDebt


Long
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-31
Value256.355322552
Percentage of LongTermDebtCurrent100.0100.0100.0100.0100.0100.0
Percentage of Assets1.50.42.91.71.41.9
Percentage of Assets us-gaap:ShortTermDebt0.00.00.00.00.00.0

Operating Lease Liability Current

us-gaap:OperatingLeaseLiabilityCurrent

us-gaap:OperatingLeaseLiabilityCurrent


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value5300000.05200000.04800000.04400000.05500000.05200000.05200000.05100000.05100000.0
Percentage of OperatingLeaseLiabilityCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.30.30.30.30.40.30.30.30.3

Liabilities Noncurrent

us-gaap:LiabilitiesNoncurrent

us-gaap:LiabilitiesNoncurrent


Liabilities
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value1040108510951058984105097310001065107210621138116011761184125712711265126712431272144914861489149915051569178818101825183218101783178017501707170017141478151115031448
Percentage of LiabilitiesNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets60.663.363.764.863.866.065.266.356.455.256.756.963.664.463.268.771.272.072.171.775.055.255.255.356.458.560.259.559.261.062.864.360.262.061.359.260.752.649.448.548.949.6

us-gaap:LiabilitiesNoncurrent us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, us-gaap:EquityMethodInvestmentNonconsolidatedInvestee

awi:WorthingtonArmstrongVenture, us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOrGroupOfInvestees


Liabilities
Period End2020-12-312019-12-31
Value234287
Percentage of LiabilitiesNoncurrent21.429.5
Percentage of Assets13.719.2
Percentage of Assets awi:WorthingtonArmstrongVenture us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOrGroupOfInvestees0.00.0

Long Term Debt

us-gaap:LongTermDebt us-gaap:ExtinguishmentOfDebt

us-gaap:LongTermDebt

us-gaap:LongTermDebt


Long
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-31
Value71561081985087310031042
Percentage of LongTermDebt100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets41.640.943.845.449.737.340.0
Percentage of Assets us-gaap:LongTermDebt0.00.00.00.00.00.00.0

Long Term Debt Noncurrent

us-gaap:LongTermDebtNoncurrent

us-gaap:LongTermDebtNoncurrent


Long
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value653684690656607678604650734749764779795810817825832840848856863925950964978992100310131024103510421050105710651038104610541062822830838839
Percentage of LongTermDebtNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets38.139.940.240.239.342.740.543.138.938.640.838.943.644.443.645.146.747.848.349.450.935.335.335.836.838.638.533.733.534.635.737.335.737.136.436.337.632.627.526.627.328.7

us-gaap:LongTermDebtNoncurrent us-gaap:ExtinguishmentOfDebt

awi:LongTermDebt1


Long
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-31
Value6906047648178489501003
Percentage of LongTermDebtNoncurrent100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets40.240.540.843.648.335.338.5
Percentage of Assets awi:LongTermDebt10.00.00.00.00.00.00.0

Deferred Income Tax Liabilities Net

us-gaap:DeferredIncomeTaxLiabilitiesNet

us-gaap:DeferredIncomeTaxLiabilitiesNet


Deferred
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-312018-12-31
Value165160158162158163124
Percentage of DeferredIncomeTaxLiabilitiesNet100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets9.69.49.29.910.311.06.6

Other Liabilities Noncurrent

us-gaap:OtherLiabilitiesNoncurrent

us-gaap:OtherLiabilitiesNoncurrent


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value567276728379374137333833333435272829293436404951515053586364676968818690897978787470
Percentage of OtherLiabilitiesNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets3.34.24.54.45.45.02.52.72.01.72.01.71.81.91.91.51.61.71.72.02.21.51.81.91.92.02.01.92.12.12.32.52.32.83.03.13.22.42.62.52.42.4

Operating Lease Liability Noncurrent

us-gaap:OperatingLeaseLiabilityNoncurrent

us-gaap:OperatingLeaseLiabilityNoncurrent


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value151514152829303025
Percentage of OperatingLeaseLiabilityNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.90.90.81.01.91.82.02.01.3

Lessee Operating Lease Liability Payments Due Year Two

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo


Lessee
Period End2020-12-312020-09-30
Value4100000.04000000.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearTwo100.0100.0
Percentage of Assets0.20.2

Lessee Operating Lease Liability Payments Due Year Three

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree


Lessee
Period End2020-12-312020-09-30
Value3000000.03100000.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearThree100.0100.0
Percentage of Assets0.20.2

Lessee Operating Lease Liability Payments Due Year Four

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour


Lessee
Period End2020-12-312020-09-30
Value2100000.02200000.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearFour100.0100.0
Percentage of Assets0.10.1

Lessee Operating Lease Liability Payments Due Year Five

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive


Lessee
Period End2020-12-31
Value1700000.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearFive100.0
Percentage of Assets0.1

Lessee Operating Lease Liability Payments Due After Year Five

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive


Lessee
Period End2020-12-31
Value6000000.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive100.0
Percentage of Assets0.3

Operating Lease Liability

us-gaap:OperatingLeaseLiability

us-gaap:OperatingLeaseLiability


Operating
Period End2020-12-312020-09-302019-12-312019-09-302019-06-302019-03-31
Value192035353028
Percentage of OperatingLeaseLiability100.0100.0100.0100.0100.0100.0
Percentage of Assets1.11.22.42.31.61.5

Lessee Operating Lease Liability Payments Due

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue


Lessee
Period End2020-12-312020-09-30
Value2223
Percentage of LesseeOperatingLeaseLiabilityPaymentsDue100.0100.0
Percentage of Assets1.31.4

Lessee Operating Lease Liability Undiscounted Excess Amount

us-gaap:LesseeOperatingLeaseLiabilityUndiscountedExcessAmount

us-gaap:LesseeOperatingLeaseLiabilityUndiscountedExcessAmount


Lessee
Period End2020-12-312020-09-30
Value3000000.03200000.0
Percentage of LesseeOperatingLeaseLiabilityUndiscountedExcessAmount100.0100.0
Percentage of Assets0.20.2

Stockholders Equity

us-gaap:StockholdersEquity

us-gaap:StockholdersEquity


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-312010-09-302010-06-302009-12-31
Value4984734504424023703643672432802613304044034193662972712662592027707687837476976497767387106735797787347197726956571130121211721090193818821907
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets29.027.626.227.126.123.324.424.312.914.413.916.522.122.122.420.016.715.415.215.011.929.328.629.128.127.124.925.824.123.723.120.626.325.625.226.824.820.137.738.938.237.30.00.00.0

us-gaap:StockholdersEquity us-gaap:StatementEquityComponents

us-gaap:AccumulatedDefinedBenefitPlansAdjustment


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302014-12-31
Value-92.2-92.4-92.6-90.2-89.4-88.7-377.0-379.0-384.5-387.4-390.2-349.7-352.4-355.5-302.3-317.2-331.5-333.5-336.0-364.6-371.5-442.5-450.3-451.0-483.2
Percentage of StockholdersEquity-18.5-19.5-20.5-20.4-22.2-23.9-103.3-103.2-158.2-138.2-149.4-105.7-87.2-88.0-72.1-86.6-111.5-123.0-126.1-140.7-183.5-57.4-58.6-57.6-74.4
Percentage of Assets-5.4-5.4-5.4-5.5-5.8-5.6-25.2-25.1-20.3-19.9-20.8-17.5-19.3-19.5-16.1-17.3-18.6-19.0-19.1-21.0-21.9-16.9-16.7-16.7-18.5
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 End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-31
Value-14.1-15.2-19.0-20.8-22.3-20.3-8.5-10.5-7.80.35.33.5
Percentage of StockholdersEquity-2.8-3.2-4.2-4.7-5.5-5.5-2.3-2.9-3.20.12.00.8
Percentage of Assets-0.8-0.9-1.1-1.3-1.4-1.3-0.6-0.7-0.40.00.30.2
Percentage of Assets us-gaap:AccumulatedGainLossNetCashFlowHedgeParent0.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedOtherComprehensiveIncome


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312013-12-312012-12-31
Value-102.9-104.7-109.3-109.8-104.3-101.7-376.1-379.6-461.0-456.5-459.6-409.2-404.4-388.7-345.9-366.1-387.1-390.1-403.8-419.3-425.9-476.6-487.4-484.8-483.4-499.4-495.5-371.6-471.4
Percentage of StockholdersEquity-20.7-22.1-24.2-24.8-25.9-27.5-103.1-103.3-189.6-162.9-176.0-123.7-100.1-96.3-82.5-100.0-130.2-143.8-151.6-161.8-210.4-61.9-63.4-61.9-64.7-71.6-76.3-55.2-65.6
Percentage of Assets-6.0-6.1-6.4-6.7-6.8-6.4-25.2-25.1-24.4-23.5-24.5-20.4-22.2-21.3-18.5-20.0-21.7-22.2-23.0-24.2-25.1-18.1-18.1-18.0-18.2-19.4-19.0-12.7-16.5
Percentage of Assets us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedTranslationAdjustment


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302014-12-31
Value3.42.92.31.27.47.39.49.9-68.7-69.4-74.7-69.0-62.0-41.2-47.1-50.7-57.7-60.5-71.6-52.2-50.2-32.4-33.8-29.6-8.3
Percentage of StockholdersEquity0.70.60.50.31.82.02.62.7-28.3-24.8-28.6-20.9-15.3-10.2-11.2-13.8-19.4-22.3-26.9-20.1-24.8-4.2-4.4-3.8-1.3
Percentage of Assets0.20.20.10.10.50.50.60.7-3.6-3.6-4.0-3.4-3.4-2.3-2.5-2.8-3.2-3.4-4.1-3.0-3.0-1.2-1.3-1.1-0.3
Percentage of Assets us-gaap:AccumulatedTranslationAdjustment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AdditionalPaidInCapital


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312013-12-312012-12-31
Value55455655355255155755554953855354751253553251651250950650450451611521151114911441139113410981076
Percentage of StockholdersEquity111.3117.5122.8124.9136.9150.5152.3149.6221.3197.4209.6154.8132.6131.7123.3140.0171.4186.9189.5194.6255.4149.6149.8146.8153.1163.5174.8163.2149.7
Percentage of Assets32.332.432.233.835.735.037.236.428.528.529.225.629.429.127.628.028.628.828.729.130.543.942.842.743.144.343.537.737.7
Percentage of Assets us-gaap:AdditionalPaidInCapital0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:RetainedEarnings


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312013-12-312012-12-31
Value9398958698578127721008970905895865839762715633599550509469442372355365379347317271207113
Percentage of StockholdersEquity188.6189.0192.9193.7201.7208.5276.3264.2372.6319.3331.2253.6188.8177.2151.1163.8185.1187.7176.4170.9183.946.147.548.446.545.641.830.815.7
Percentage of Assets54.752.250.652.552.648.667.564.347.946.146.241.941.839.233.832.830.829.026.725.621.913.513.614.113.112.310.47.14.0
Percentage of Assets us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:TreasuryStock


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312013-12-31
Value-893.9-873.9-863.9-857.9-857.9-857.9-823.5-773.4-740.3-712.2-692.2-611.7-490.6-455.6-385.6-380.6-376.1-355.2-305.2-269.2-261.4-261.4-261.4-261.4-261.4-261.4-261.4-261.4
Percentage of StockholdersEquity-179.4-184.5-191.6-193.8-212.9-231.6-225.7-210.6-304.5-254.1-265.0-184.9-121.4-112.8-92.0-103.9-126.5-131.0-114.6-103.9-129.2-33.9-34.0-33.4-35.0-37.5-40.3-38.8
Percentage of Assets-52.1-50.9-50.3-52.5-55.6-53.9-55.1-51.2-39.2-36.7-36.9-30.5-26.9-25.0-20.6-20.8-21.1-20.2-17.4-15.5-15.4-10.0-9.7-9.7-9.8-10.2-10.0-9.0
Percentage of Assets us-gaap:TreasuryStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Additional Paid In Capital Common Stock

us-gaap:AdditionalPaidInCapitalCommonStock

us-gaap:AdditionalPaidInCapitalCommonStock


Additional
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value554556553552551557555549538553547512535532516512509506504504516115211511149114411391134112411171112109810911087108210761074107010661467146414611451
Percentage of AdditionalPaidInCapitalCommonStock100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets32.332.432.233.835.735.037.236.428.528.529.225.629.429.127.628.028.628.828.729.130.543.942.842.743.144.343.537.436.537.237.738.836.737.737.737.338.232.749.047.047.649.7

Retained Earnings Accumulated Deficit

us-gaap:RetainedEarningsAccumulatedDeficit

us-gaap:RetainedEarningsAccumulatedDeficit


Retained
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302011-12-312011-09-302011-06-302010-12-31
Value939895869857812772100897090589586583976271563359955050946944237235536537934731727127424322420719614611611310441776816-35.3
Percentage of RetainedEarningsAccumulatedDeficit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets54.752.250.652.552.648.667.564.347.946.146.241.941.839.233.832.830.829.026.725.621.913.513.614.113.112.310.49.17.97.57.17.04.94.04.03.61.52.62.20.5-1.2

Accumulated Other Comprehensive Income Loss Net Of Tax

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax


Accumulated
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value-102.9-104.7-109.3-109.8-104.3-101.7-376.1-379.6-461.0-456.5-459.6-409.2-404.4-388.7-345.9-366.1-387.1-390.1-403.8-419.3-425.9-476.6-487.4-484.8-483.4-499.4-495.5-361.6-360.9-365.5-371.6-447.5-454.9-464.4-471.4-407.5-417.7-409.6-415.0-321.4-306.2-325.7
Percentage of AccumulatedOtherComprehensiveIncomeLossNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets-6.0-6.1-6.4-6.7-6.8-6.4-25.2-25.1-24.4-23.5-24.5-20.4-22.2-21.3-18.5-20.0-21.7-22.2-23.0-24.2-25.1-18.1-18.1-18.0-18.2-19.4-19.0-12.0-11.8-12.2-12.7-15.9-15.4-16.2-16.5-14.1-14.9-12.6-13.9-10.3-10.0-11.1

Net Cash Provided By Used In Operating Activities

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInOperatingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value62197069532561743214447063266562311051529.6-65.0598593-34.1978855-32.95211857-14.07911162-33.1829768-36.14985
Percentage of NetCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax22.27.829.528.326.110.324.826.811.96.118.526.925.311.430.626.714.13.4-52.315.83.1-11.410.312.914.7-6.222.112.27.8-5.27.916.28.1-2.212.916.08.8-5.012.612.69.1-5.37.611.5

Net Cash Provided By Used In Investing Activities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value2.0-8.8-88.9-62.50.49.9-18.2-39.36.4-38.023287-7.15.8-12.9-0.6-3.2-37.5-10.1-3.06.4-10.3-56.2-21.0-16.2-8.1-52.4-29.1-45.8-22.0-59.4-23.9-25.2-37.3-30.5-19.2-26.7-15.524-19.7-14.9-7.8-37.1-6.6
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.7-3.5-37.2-25.40.24.0-7.4-14.22.4-15.79.9110.2-2.92.6-6.0-0.3-1.4-11.910.2-0.92.0-1.8-9.7-3.2-2.6-1.5-11.8-4.0-6.5-3.5-9.0-3.3-3.6-6.0-5.0-2.8-3.8-2.33.7-2.5-2.0-1.1-5.8-0.9

Net Cash Provided By Used In Financing Activities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value-67.2-26.21614-83.566-95.9-186.4-72.7-29.9-66.8-156.7-41.6-64.2-10.5-27.6-28.5-36.1-40.7-5.3-62.8-20.1-8.7-8.6-9.5-5.52.0-60.09.4514.9-262.3-0.1-6.2-11.0-13.6-498.7249-0.2-2.53.2-32.9-381.5-9.3
Percentage of NetCashProvidedByUsedInFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-24.0-10.46.75.8-41.126.9-38.8-67.3-26.7-12.4-28.0-60.2-16.7-28.2-4.9-11.8-12.6-11.441.0-1.6-20.0-3.5-1.5-1.3-1.5-1.00.5-8.21.38.20.7-35.9-0.0-1.0-1.8-2.0-70.237.4-0.0-0.30.4-4.8-59.3-1.3

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-2.6-15.3-1.921-29.8101-52.7-152.3-33.5-51.9-1.3
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-0.9-6.1-0.88.8-14.740.9-21.3-55.0-12.3-21.4-0.5

Depreciation Depletion And Amortization

us-gaap:DepreciationDepletionAndAmortization

us-gaap:DepreciationDepletionAndAmortization


Depreciation
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value2525222419181918181517172122262419181919203031292828313532302927262527252634252729313848
Percentage of DepreciationDepletionAndAmortization100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Increase Decrease In Inventories

us-gaap:IncreaseDecreaseInInventories

us-gaap:IncreaseDecreaseInInventories


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value1.22.1-0.11.45.41.0-1.2-1.6-1.411-5.4-7.84.817-5.1-0.3-0.52.32.65.0-0.3-0.35.3-5.6-3.419-16.6-1.9-1.947-4.0-6.5-7.229-14.6-4.27.611-35.2-3.51117-16.7-4.7
Percentage of IncreaseDecreaseInInventories100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Increase Decrease In Other Operating Capital Net

us-gaap:IncreaseDecreaseInOtherOperatingCapitalNet

us-gaap:IncreaseDecreaseInOtherOperatingCapitalNet


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value5.05.8-2.724-2.0-7.81.0-0.42.4-0.310-2.81.41.3-0.71.7-1.61.40.50.51.82.34.7-0.51.5-4.3-2.7-3.33.6-1.2-1.25.0-0.1-3.0
Percentage of IncreaseDecreaseInOtherOperatingCapitalNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Net Cash Provided By Used In Operating Activities

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInOperatingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value62197069532561743214447063266562311051529.6-65.0598593-34.1978855-32.95211857-14.07911162-33.1829768-36.14985
Percentage of NetCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax22.27.829.528.326.110.324.826.811.96.118.526.925.311.430.626.714.13.4-52.315.83.1-11.410.312.914.7-6.222.112.27.8-5.27.916.28.1-2.212.916.08.8-5.012.612.69.1-5.37.611.5

Net Income Loss

us-gaap:NetIncomeLoss

us-gaap:NetIncomeLoss


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value5535225450-226.2477354393476472733494130277016-9.9-13.8312946-3.63118161050293.08.46241188.5523713-21.02426
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax19.714.19.621.924.8-91.019.326.420.016.214.529.319.012.215.721.118.39.6-27.321.15.4-1.7-2.44.84.78.5-0.84.32.72.71.66.94.20.51.49.15.92.71.36.85.12.0-3.33.33.7

us-gaap:NetIncomeLoss us-gaap:BusinessAcquisition

awi:ArkturaMozAndTurf


Net
Period End2021-03-31
Value5.7
Percentage of NetIncomeLoss16.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax2.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax awi:ArkturaMozAndTurf34.5

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

us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:AccumulatedGainLossNetCashFlowHedgeParent


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value1.71.51.51.51.20.20.1-0.4-0.3
Percentage of NetIncomeLoss3.14.26.62.82.4-0.10.2-0.5-0.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.60.60.60.60.60.10.0-0.1-0.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome us-gaap:AccumulatedGainLossNetCashFlowHedgeParent0.00.00.00.00.00.00.00.00.0

us-gaap:NetIncomeLoss us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, us-gaap:EquityMethodInvestmentNonconsolidatedInvestee

awi:WorthingtonArmstrongVenture, us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOrGroupOfInvestees


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value494434332940384343
Percentage of NetIncomeLoss89.8126.0151.361.957.9-18.081.160.079.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax17.717.714.513.614.316.415.715.815.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax awi:WorthingtonArmstrongVenture us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOrGroupOfInvestees45.545.240.038.738.642.842.643.940.9

us-gaap:NetIncomeLoss us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value5535225450-226.2477354393476472733494130277016-9.9-13.8312946-3.63118161050293.08.46241188.5523713-21.024
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax19.714.19.621.924.8-91.019.326.420.016.214.529.319.012.215.721.118.39.6-27.321.15.4-1.7-2.44.84.78.5-0.84.32.72.71.66.94.20.51.49.15.92.71.36.85.12.0-3.33.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Share Based Compensation

us-gaap:ShareBasedCompensation

us-gaap:ShareBasedCompensation


Share
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value3.22.32.10.92.90.92.43.02.31.84.83.92.72.62.13.02.62.52.82.94.12.62.23.63.44.22.52.32.85.13.23.93.75.13.54.13.84.22.62.52.93.11.91.6
Percentage of ShareBasedCompensation100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Net Cash Provided By Used In Investing Activities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value2.0-8.8-88.9-62.50.49.9-18.2-39.36.4-38.023287-7.15.8-12.9-0.6-3.2-37.5-10.1-3.06.4-10.3-56.2-21.0-16.2-8.1-52.4-29.1-45.8-22.0-59.4-23.9-25.2-37.3-30.5-19.2-26.7-15.524-19.7-14.9-7.8-37.1-6.6
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.7-3.5-37.2-25.40.24.0-7.4-14.22.4-15.79.9110.2-2.92.6-6.0-0.3-1.4-11.910.2-0.92.0-1.8-9.7-3.2-2.6-1.5-11.8-4.0-6.5-3.5-9.0-3.3-3.6-6.0-5.0-2.8-3.8-2.33.7-2.5-2.0-1.1-5.8-0.9

Payments To Acquire Productive Assets

us-gaap:PaymentsToAcquireProductiveAssets

us-gaap:PaymentsToAcquireProductiveAssets


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value171322146.5122716121431151510261819252822242874403026714862407347405273484334584230194020
Percentage of PaymentsToAcquireProductiveAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Net Cash Provided By Used In Financing Activities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value-67.2-26.21614-83.566-95.9-186.4-72.7-29.9-66.8-156.7-41.6-64.2-10.5-27.6-28.5-36.1-40.7-5.3-62.8-20.1-8.7-8.6-9.5-5.52.0-60.09.4514.9-262.3-0.1-6.2-11.0-13.6-498.7249-0.2-2.53.2-32.9-381.5-9.3
Percentage of NetCashProvidedByUsedInFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-24.0-10.46.75.8-41.126.9-38.8-67.3-26.7-12.4-28.0-60.2-16.7-28.2-4.9-11.8-12.6-11.441.0-1.6-20.0-3.5-1.5-1.3-1.5-1.00.5-8.21.38.20.7-35.9-0.0-1.0-1.8-2.0-70.237.4-0.0-0.30.4-4.8-59.3-1.3

Repayments Of Long Term Debt

us-gaap:RepaymentsOfLongTermDebt

us-gaap:RepaymentsOfLongTermDebt


Repayments
Period End2021-06-302021-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value6.26.335766158.18.18.18.28.18.28.18.10.61.30.7411201010107.47.67.57.61.229591.210268.38.22.01.52.62.72.21.643012
Percentage of RepaymentsOfLongTermDebt100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Payments Of Dividends

us-gaap:PaymentsOfDividends

us-gaap:PaymentsOfDividends


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value1010109.69.99.69.78.68.88.50.00.00.01.20.10.00.01.20.40.30.00.73.60.35030.1
Percentage of PaymentsOfDividends100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.00.0100.0100.00.00.0100.0100.0100.00.0100.0100.0100.0100.0100.0

Payments For Repurchase Of Common Stock

us-gaap:PaymentsForRepurchaseOfCommonStock

us-gaap:PaymentsForRepurchaseOfCommonStock


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-31
Value2010.010.00.00.034503328205015135705.04.5205036
Percentage of PaymentsForRepurchaseOfCommonStock100.0100.0100.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Effective Income Tax Rate Continuing Operations

us-gaap:EffectiveIncomeTaxRateContinuingOperations

us-gaap:EffectiveIncomeTaxRateContinuingOperations


Effective
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
Value25.824.621.90.1870.2580.150.2330.2680.2030.2710.1660.2890.4080.4440.1210.5982.4490.4510.4570.8410.4530.5390.5330.3180.4580.7880.220.3350.4120.3660.381
Percentage of EffectiveIncomeTaxRateContinuingOperations100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber


Share
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value139600.0261100.0602500.01272400.01350600.01410300.01601200.02204600.02311000.02024200.01978400.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice


Share
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value42.4140.8441.7134.2334.6640.6640.3335.630.0528.324.02
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Deferred Tax Liabilities

us-gaap:DeferredTaxLiabilities

us-gaap:DeferredTaxLiabilities


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312012-12-312011-12-31
Value1581531091221415887355372
Percentage of DeferredTaxLiabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0

Deferred Tax Assets Net

us-gaap:DeferredTaxAssetsNet

us-gaap:DeferredTaxAssetsNet


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value848010196159282243320373400
Percentage of DeferredTaxAssetsNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Unrecognized Tax Benefits

us-gaap:UnrecognizedTaxBenefits

us-gaap:UnrecognizedTaxBenefits


Unrecognized
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value413442538615014214513812712657
Percentage of UnrecognizedTaxBenefits100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

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
Value79757947606987228205194
Percentage of DeferredTaxAssetsValuationAllowance100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxAssetsValuationAllowance us-gaap:IncomeTaxAuthority

us-gaap:DomesticCountry


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312014-12-312013-12-312012-12-31
Value171319100.831254.9
Percentage of DeferredTaxAssetsValuationAllowance22.317.424.021.71.335.911.12.4

us-gaap:StateAndLocalJurisdiction


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-31
Value424647191613149.4
Percentage of DeferredTaxAssetsValuationAllowance53.461.559.440.927.320.016.64.1

us-gaap:DeferredTaxAssetsValuationAllowance us-gaap:IncomeTaxAuthority, us-gaap:TaxCreditCarryforward

awi:FederalAndState, us-gaap:CapitalLossCarryforward


Deferred
Period End2020-12-312019-12-31
Value1916
Percentage of DeferredTaxAssetsValuationAllowance24.321.2

awi:AdjustmentsToAPICShareBasedCompensationRequisiteServicePeriodRecognitionValueWithAdjustmentsRelatedToTaxWithholdingForShareBasedCompensation

awi:AdjustmentsToAPICShareBasedCompensationRequisiteServicePeriodRecognitionValueWithAdjustmentsRelatedToTaxWithholdingForShareBasedCompensation


Adjustments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-30
Value-1.92.95.10.9-5.61.66.311-15.25.95.26.53.7154.63.02.71.1-3.96.16.40.62.05.5
Percentage of AdjustmentsToAPICShareBasedCompensationRequisiteServicePeriodRecognitionValueWithAdjustmentsRelatedToTaxWithholdingForShareBasedCompensation100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

awi:AdjustmentsToAPICShareBasedCompensationRequisiteServicePeriodRecognitionValueWithAdjustmentsRelatedToTaxWithholdingForShareBasedCompensation us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital


Adjustments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-30
Value-1.92.95.10.9-5.61.66.311-15.25.95.26.53.7154.63.02.71.1-3.96.16.40.62.05.5
Percentage of AdjustmentsToAPICShareBasedCompensationRequisiteServicePeriodRecognitionValueWithAdjustmentsRelatedToTaxWithholdingForShareBasedCompensation100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

awi:BusinessAcquisitionAdditionalCashPayments us-gaap:TitleOfIndividual, us-gaap:BusinessAcquisition

awi:BusinessAcquisitionAdditionalCashPayments

awi:ArkturaSeller, awi:ArkturaLLC


Business
Period End2020-12-16
Value24
Percentage of BusinessAcquisitionAdditionalCashPayments100.0

awi:BusinessAcquisitionsProFormaIncomeLossFromContinuingOperationsBeforeIncomeTaxes

awi:BusinessAcquisitionsProFormaIncomeLossFromContinuingOperationsBeforeIncomeTaxes


Business
Period End2021-06-302020-06-30
Value7956
Percentage of BusinessAcquisitionsProFormaIncomeLossFromContinuingOperationsBeforeIncomeTaxes100.0100.0

awi:BusinessCombinationAdditionalContingentConsiderationPayable us-gaap:Range, us-gaap:BusinessAcquisition

awi:BusinessCombinationAdditionalContingentConsiderationPayable

srt:Maximum, awi:TURFDesignInc


Business
Period End2020-07-27
Value48
Percentage of BusinessCombinationAdditionalContingentConsiderationPayable100.0

awi:BusinessCombinationContingentConsiderationAnnualGrowthRate us-gaap:AwardType, us-gaap:BusinessAcquisition

awi:BusinessCombinationContingentConsiderationAnnualGrowthRate

awi:OverTargetPayout, awi:TURFDesignInc


Business
Period End2020-07-27
Value38.0
Percentage of BusinessCombinationContingentConsiderationAnnualGrowthRate100.0

awi:TargetPayout, awi:TURFDesignInc


Business
Period End2020-07-27
Value23.0
Percentage of BusinessCombinationContingentConsiderationAnnualGrowthRate60.5

awi:BusinessCombinationContingentConsiderationAnnualGrowthRate us-gaap:BusinessAcquisition, us-gaap:SubsequentEventType

awi:TURFDesignInc, us-gaap:SubsequentEvent


Business
Period End2020-07-27
Value0.23
Percentage of BusinessCombinationContingentConsiderationAnnualGrowthRate0.6

awi:BusinessCombinationContingentConsiderationAnnualGrowthRate us-gaap:Range, us-gaap:BusinessAcquisition, us-gaap:SubsequentEventType

srt:Maximum, awi:TURFDesignInc, us-gaap:SubsequentEvent


Business
Period End2020-07-27
Value0.38
Percentage of BusinessCombinationContingentConsiderationAnnualGrowthRate1.0

awi:BusinessCombinationContingentConsiderationArrangements us-gaap:AwardType, us-gaap:BusinessAcquisition

awi:BusinessCombinationContingentConsiderationArrangements

awi:TargetPayout, awi:TURFDesignInc


Business
Period End2020-07-27
Value24
Percentage of BusinessCombinationContingentConsiderationArrangements100.0

awi:BusinessCombinationContingentConsiderationArrangements us-gaap:BusinessAcquisition, us-gaap:SubsequentEventType

awi:TURFDesignInc, us-gaap:SubsequentEvent


Business
Period End2020-07-27
Value24
Percentage of BusinessCombinationContingentConsiderationArrangements100.0

awi:BusinessCombinationContingentConsiderationArrangements us-gaap:Range, us-gaap:AwardType, us-gaap:BusinessAcquisition

srt:Maximum, awi:OverTargetPayout, awi:TURFDesignInc


Business
Period End2020-07-27
Value24
Percentage of BusinessCombinationContingentConsiderationArrangements100.0

awi:BusinessCombinationContingentConsiderationArrangements us-gaap:Range, us-gaap:BusinessAcquisition, us-gaap:SubsequentEventType

srt:Maximum, awi:TURFDesignInc, us-gaap:SubsequentEvent


Business
Period End2020-07-27
Value24
Percentage of BusinessCombinationContingentConsiderationArrangements100.0

awi:DisposalGroupIncludingDiscontinuedOperationWorkingCapitalAdjustmentToCashConsiderationPayable dei:LegalEntity

awi:DisposalGroupIncludingDiscontinuedOperationWorkingCapitalAdjustmentToCashConsiderationPayable

awi:Knauf


Disposal
Period End2020-09-30
Value6400000.0
Percentage of DisposalGroupIncludingDiscontinuedOperationWorkingCapitalAdjustmentToCashConsiderationPayable100.0

awi:DomesticPensionCreditExpense

awi:DomesticPensionCreditExpense


Domestic
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value-2.00.0-1.9371-1.8-1.9-1.9-1.9-6.6-6.6-6.5-6.6-6.514-6.2-6.23.23.23.25.4
Percentage of DomesticPensionCreditExpense100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

awi:EarningsAllocatedToParticipatingVestedBasicAndDilutedShare

awi:EarningsAllocatedToParticipatingVestedBasicAndDilutedShare


Earnings
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-312019-09-302019-06-30
Value100000.0100000.00100000.0100000.0100000.0200000.0100000.0
Percentage of EarningsAllocatedToParticipatingVestedBasicAndDilutedShare100.0100.00.0100.0100.0100.0100.0100.0

awi:FairValueWeightedAverageUnobservableInputsPercentage us-gaap:BusinessAcquisition, us-gaap:MeasurementInputType

awi:FairValueWeightedAverageUnobservableInputsPercentage

awi:MozDesignsInc, us-gaap:MeasurementInputDefaultRate


Fair
Period End2021-06-302021-03-312020-12-31
Value-0.12.8-1.9
Percentage of FairValueWeightedAverageUnobservableInputsPercentage100.0100.0100.0

awi:MozDesignsInc, us-gaap:MeasurementInputPriceVolatility


Fair
Period End2021-06-302021-03-312020-12-31
Value-3.123.9-1.8
Percentage of FairValueWeightedAverageUnobservableInputsPercentage3100.0853.694.7

awi:TURFDesignInc, us-gaap:MeasurementInputDefaultRate


Fair
Period End2021-06-302021-03-312020-12-31
Value-0.12.8-1.9
Percentage of FairValueWeightedAverageUnobservableInputsPercentage100.0100.0100.0

awi:TURFDesignInc, us-gaap:MeasurementInputPriceVolatility


Fair
Period End2021-06-302021-03-312020-12-31
Value-3.424.3-1.0
Percentage of FairValueWeightedAverageUnobservableInputsPercentage3400.0867.952.6

awi:LossOnSaleToKnauf dei:LegalEntity, us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations

awi:LossOnSaleToKnauf

awi:Knauf, awi:EuropeMiddleEastAndAfricaIncludingRussiaAndPacificRimBusinesses


Loss
Period End2020-12-31
Value12
Percentage of LossOnSaleToKnauf100.0

awi:NetIncomeLossFromContinuingOperationsAvailableToCommonStockholders

awi:NetIncomeLossFromContinuingOperationsAvailableToCommonStockholders


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value5537345449-222.65190633636644741104434130285516-11.6-10.930293.8323120163755303.223734118
Percentage of NetIncomeLossFromContinuingOperationsAvailableToCommonStockholders100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

awi:PaymentMadeToInvestmentInJointVentureFromProceedsFromSaleOfBusiness

awi:PaymentMadeToInvestmentInJointVentureFromProceedsFromSaleOfBusiness


Payment
Period End2021-03-312020-12-312020-09-302018-12-31
Value110.05.90.0
Percentage of PaymentMadeToInvestmentInJointVentureFromProceedsFromSaleOfBusiness100.00.0100.00.0

awi:PaymentMadeToInvestmentInJointVentureFromProceedsFromSaleOfBusiness us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

awi:WorthingtonArmstrongVenture


Payment
Period End2020-12-312020-09-302018-12-312018-09-30
Value0.05.90.070
Percentage of PaymentMadeToInvestmentInJointVentureFromProceedsFromSaleOfBusiness0.0100.00.00.0

awi:PaymentsForFinanceLeases

awi:PaymentsForFinanceLeases


Payments
Period End2021-06-302021-03-312020-12-31
Value500000.0500000.0600000.0
Percentage of PaymentsForFinanceLeases100.0100.0100.0

awi:ProceedsPaymentsFromShareBasedCompensationPlansNetOfTax

awi:ProceedsPaymentsFromShareBasedCompensationPlansNetOfTax


Proceeds
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-5.20.73.00.0-8.60.83.94.8-18.24.80.4
Percentage of ProceedsPaymentsFromShareBasedCompensationPlansNetOfTax100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0

awi:ValuationLossOnPensionLiabilities

awi:ValuationLossOnPensionLiabilities


Valuation
Period End2020-12-31
Value12
Percentage of ValuationLossOnPensionLiabilities100.0

awi:ValuationLossOnPensionLiabilities us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations

awi:EuropeMiddleEastAndAfricaIncludingRussiaAndPacificRimBusinesses


Valuation
Period End2021-03-31
Value11
Percentage of ValuationLossOnPensionLiabilities0.0

us-gaap:AccrualForEnvironmentalLossContingenciesPeriodIncreaseDecrease

us-gaap:AccrualForEnvironmentalLossContingenciesPeriodIncreaseDecrease


Accrual
Period End2021-06-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value0.20.00.00.00.01.01.00.00.50.00.08.80.00.70.60.42.00.10.7
Percentage of AccrualForEnvironmentalLossContingenciesPeriodIncreaseDecrease100.00.00.00.00.0100.0100.00.0100.00.00.0100.00.0100.0100.0100.0100.0100.0100.0

us-gaap:BusinessAcquisitionsProFormaNetIncomeLoss

us-gaap:BusinessAcquisitionsProFormaNetIncomeLoss


Business
Period End2021-03-312020-03-31
Value42-234.0
Percentage of BusinessAcquisitionsProFormaNetIncomeLoss100.0100.0

us-gaap:BusinessAcquisitionsProFormaRevenue

us-gaap:BusinessAcquisitionsProFormaRevenue


Business
Period End2021-06-302021-03-312020-06-302020-03-31
Value280252221263
Percentage of BusinessAcquisitionsProFormaRevenue100.0100.0100.0100.0

us-gaap:BusinessCombinationConsiderationTransferred1 us-gaap:BusinessAcquisition

us-gaap:BusinessCombinationConsiderationTransferred1

awi:MozDesignsInc


Business
Period End2020-08-24
Value4.2
Percentage of BusinessCombinationConsiderationTransferred1100.0

awi:TURFDesignInc


Business
Period End2020-07-27
Value70
Percentage of BusinessCombinationConsiderationTransferred10.0

us-gaap:BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1

us-gaap:BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1


Business
Period End2021-06-30
Value-9700000.0
Percentage of BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1100.0

us-gaap:CapitalExpendituresIncurredButNotYetPaid

us-gaap:CapitalExpendituresIncurredButNotYetPaid


Capital
Period End2021-06-302021-03-312020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value1.20.70.11.20.2-0.40.91.3-0.2-1.52.30.8-1.00.42.4-0.3-2.7-0.98.3-6.90.30.7201.23.1-2.416-0.5-4.04.914100.82.512
Percentage of CapitalExpendituresIncurredButNotYetPaid100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CashAcquiredFromAcquisition us-gaap:BusinessAcquisition

us-gaap:CashAcquiredFromAcquisition

awi:ArkturaLLC


Cash
Period End2020-12-16
Value800000.0
Percentage of CashAcquiredFromAcquisition100.0

us-gaap:CommonStockDividendsPerShareDeclared

us-gaap:CommonStockDividendsPerShareDeclared


Common
Period End2021-04-302021-02-282020-10-312020-07-312020-04-302020-02-292019-10-312019-07-312019-04-302019-02-282012-12-312012-09-302012-06-302012-03-31
Value0.210.210.210.20.20.20.20.1750.1750.1750008.55
Percentage of CommonStockDividendsPerShareDeclared100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.00.0100.0

us-gaap:CommonStockDividendsPerShareDeclared us-gaap:SubsequentEventType

us-gaap:SubsequentEvent


Common
Period End2021-07-212021-04-202021-02-172020-07-222020-04-222020-02-192019-10-232019-07-23
Value0.210.210.210.20.20.20.20.175
Percentage of CommonStockDividendsPerShareDeclared0.00.00.00.00.00.00.00.0

us-gaap:DefinedBenefitPlanAmortizationOfGainsLosses us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanAmortizationOfGainsLosses

awi:RetireeHealthAndLifeInsuranceBenefits


Defined
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value600000.0500000.01600000.01700000.01700000.01600000.02100000.02200000.02000000.02200000.01500000.01400000.01400000.01400000.0900000.0900000.0900000.0900000.01400000.01100000.01300000.0
Percentage of DefinedBenefitPlanAmortizationOfGainsLosses100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

awi:USDefinedBenefitPensionPlans


Defined
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value-900000.0-900000.0-800000.0-800000.0-800000.0-3900000.0-4800000.0-4800000.0-4800000.0-4800000.0-5000000.0-5000000.0-5000000.0-5000000.0-4700000.0-4300000.0-4300000.0-4200000.0
Percentage of DefinedBenefitPlanAmortizationOfGainsLosses-150.0-180.0-50.0-47.1-47.1-243.8-228.6-218.2-240.0-218.2-333.3-357.1-357.1-357.1-522.2-477.8-477.8-466.7

us-gaap:DefinedBenefitPlanAmortizationOfPriorServiceCostCredit us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanAmortizationOfPriorServiceCostCredit

awi:RetireeHealthAndLifeInsuranceBenefits


Defined
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302016-12-312016-09-302016-06-30
Value0-100000.0-100000.0-100000.00-100000.0-100000.00-100000.00-100000.0-100000.0
Percentage of DefinedBenefitPlanAmortizationOfPriorServiceCostCredit0.0100.0100.0100.00.0100.0100.00.0100.00.0100.0100.0

us-gaap:DefinedBenefitPlanCostOfProvidingSpecialOrContractualTerminationBenefitRecognizedDuringPeriod us-gaap:RetirementPlanName

us-gaap:DefinedBenefitPlanCostOfProvidingSpecialOrContractualTerminationBenefitRecognizedDuringPeriod

awi:RetirementIncomePlan


Defined
Period End2020-12-31
Value0.0
Percentage of DefinedBenefitPlanCostOfProvidingSpecialOrContractualTerminationBenefitRecognizedDuringPeriod0.0

us-gaap:DefinedBenefitPlanCostOfProvidingSpecialOrContractualTerminationBenefitRecognizedDuringPeriod us-gaap:RetirementPlanType

awi:USDefinedBenefitPensionPlans


Defined
Period End2020-12-312020-09-30
Value0.02.0
Percentage of DefinedBenefitPlanCostOfProvidingSpecialOrContractualTerminationBenefitRecognizedDuringPeriod0.00.0

us-gaap:DefinedBenefitPlanExpectedReturnOnPlanAssets us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanExpectedReturnOnPlanAssets

awi:USDefinedBenefitPensionPlans


Defined
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value4.24.16.56.66.514202020202324242424242424
Percentage of DefinedBenefitPlanExpectedReturnOnPlanAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DefinedBenefitPlanInterestCost us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanInterestCost

awi:RetireeHealthAndLifeInsuranceBenefits


Defined
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value0.30.30.50.40.50.50.60.60.60.60.70.60.70.60.80.70.80.71.00.91.0
Percentage of DefinedBenefitPlanInterestCost100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

awi:USDefinedBenefitPensionPlans


Defined
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value2.32.22.82.82.77.2121212121111111111121212
Percentage of DefinedBenefitPlanInterestCost766.7733.3560.0700.0540.01440.02100.02083.32100.02100.01642.91916.71657.11916.71387.51728.61550.01785.7

us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost

awi:RetireeHealthAndLifeInsuranceBenefits


Defined
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value-0.3-0.3-1.2-1.4-1.2-1.2-1.6-1.5-1.5-1.6-0.8-0.8-0.6-0.80.0-0.10.0-0.1-0.3-0.2-0.3
Percentage of DefinedBenefitPlanNetPeriodicBenefitCost100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.00.0100.0100.0100.0100.0

awi:USDefinedBenefitPensionPlans


Defined
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value0.20.2-1.60.4-1.6372-1.4-1.5-1.4-1.5-6.0-6.1-5.9-6.1-6.015-5.7-5.6
Percentage of DefinedBenefitPlanNetPeriodicBenefitCost-66.7-66.7133.3-28.6133.3-31000.087.5100.093.393.8750.0762.5983.3762.50.0-15100.00.05600.0

us-gaap:DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1 us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1

awi:USDefinedBenefitPensionPlans


Defined
Period End2020-12-312020-09-302020-06-302020-03-312017-12-312017-09-30
Value0.00.00.0-374.40.0-20.8
Percentage of DefinedBenefitPlanRecognizedNetGainLossDueToSettlements10.00.00.0100.00.0100.0

us-gaap:DefinedBenefitPlanServiceCost us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanServiceCost

awi:USDefinedBenefitPensionPlans


Defined
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value1.21.21.31.41.41.41.21.21.21.21.41.41.51.42.22.22.12.1
Percentage of DefinedBenefitPlanServiceCost100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DerivativeInstrumentsGainLossReclassificationFromAccumulatedOCIToIncomeEstimatedNetAmountToBeTransferred

us-gaap:DerivativeInstrumentsGainLossReclassificationFromAccumulatedOCIToIncomeEstimatedNetAmountToBeTransferred


Derivative
Period End2021-06-302021-03-312020-12-31
Value0-8500000.0-300000.0
Percentage of DerivativeInstrumentsGainLossReclassificationFromAccumulatedOCIToIncomeEstimatedNetAmountToBeTransferred0.0100.0100.0

us-gaap:DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:IncomeStatementLocation

us-gaap:DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet

us-gaap:InterestRateSwap, us-gaap:CashFlowHedging, us-gaap:InterestExpense


Derivative
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
Value2.21.91.91.91.50.30.1-0.5-0.4-0.6-0.5-0.3-0.3-0.5
Percentage of DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship

us-gaap:CashFlowHedging


Derivative
Period End2020-12-312020-09-302019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value1.91.90.1-0.5-0.4-0.60.3-0.2-0.4-1.2
Percentage of DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet100.0100.0100.0100.0100.0100.0-60.066.7133.3240.0

us-gaap:DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax

us-gaap:DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax


Discontinued
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-03-312015-03-31
Value0.0-0.4-11.999999999999998-0.20.8-5.00.7-27.3-6.82.21.72.4-5.7-17.7-74.00.00.0-0.1-0.1-0.6
Percentage of DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax0.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.0100.0100.0100.0

us-gaap:DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations

awi:EuropeMiddleEastAndAfricaIncludingRussiaAndPacificRimBusinesses


Discontinued
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value0.0-0.4-12.0-0.20.0-5.00.7-27.3-6.82.21.72.4-5.7-17.7-74.0
Percentage of DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax0.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

awi:FlooringBusinesses


Discontinued
Period End2020-12-312020-09-302020-06-302017-12-312017-09-302017-06-302017-03-31
Value0.00.00.80.00.00.0-0.1
Percentage of DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax-0.0-0.0100.0-0.00.00.0100.0

us-gaap:DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax

us-gaap:DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax


Discontinued
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302013-12-312013-09-302013-06-302013-03-31
Value0.0-2.1-12.0-0.20.8-3.61.0-22.3-6.92.22.87.0-5.8-17.3-75.35.9-0.2-0.4-1.4140.31.7-2.41.5-0.342-12.2-0.2-2.1-12.85.50.7-0.2
Percentage of DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax0.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations

awi:EuropeMiddleEastAndAfricaIncludingRussiaAndPacificRimBusinesses


Discontinued
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value0.0-2.1-12.0-0.20.0-3.60.7-27.3-6.82.21.72.4-5.7-17.7-74.0
Percentage of DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax0.0100.0100.0100.00.0100.070.0122.498.6100.060.734.398.3102.398.3

awi:FlooringBusinesses


Discontinued
Period End2020-12-312020-09-302020-06-302019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value0.00.00.80.35.0-0.11.14.6-0.10.4-1.35.9-0.2-0.4
Percentage of DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax-0.0-0.0100.030.0-22.41.439.365.71.7-2.31.7100.0100.0100.0

us-gaap:DiscontinuedOperationTaxEffectOfIncomeLossFromDisposalOfDiscontinuedOperation

us-gaap:DiscontinuedOperationTaxEffectOfIncomeLossFromDisposalOfDiscontinuedOperation


Discontinued
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302013-12-312013-09-302013-06-30
Value0.01.70.00.00.0-1.4-0.3-5.00.1-1.1-4.60.1-0.41.3-5.90.20.31.4-14.7-0.1-1.82.3-0.70.0-43.4-1.30.0-1.2-0.2-2.9-0.4
Percentage of DiscontinuedOperationTaxEffectOfIncomeLossFromDisposalOfDiscontinuedOperation0.0100.00.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.00.0100.0100.0100.0100.0

us-gaap:DiscontinuedOperationTaxEffectOfIncomeLossFromDisposalOfDiscontinuedOperation us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations

awi:EuropeMiddleEastAndAfricaIncludingRussiaAndPacificRimBusinesses


Discontinued
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-31
Value0.01.70.00.00.0-1.4
Percentage of DiscontinuedOperationTaxEffectOfIncomeLossFromDisposalOfDiscontinuedOperation0.0100.00.00.00.0100.0

us-gaap:DividendsCommonStock

us-gaap:DividendsCommonStock


Dividends
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value1010109.79.69.99.88.68.78.9
Percentage of DividendsCommonStock100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DividendsCommonStock us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings


Dividends
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value1010109.79.69.99.88.68.78.9
Percentage of DividendsCommonStock100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations

us-gaap:EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations


Effect
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value300000.0100000.0600000.0300000.0300000.0-800000.0100000.0-1000000.0500000.01300000.0-2400000.0
Percentage of EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings


Fair
Period End2021-06-302021-03-31
Value9700000.0200000.0
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings100.0100.0

us-gaap:FinanceLeaseInterestExpense

us-gaap:FinanceLeaseInterestExpense


Finance
Period End2020-12-312020-09-30
Value200000.0400000.0
Percentage of FinanceLeaseInterestExpense100.0100.0

us-gaap:FinanceLeaseInterestPaymentOnLiability

us-gaap:FinanceLeaseInterestPaymentOnLiability


Finance
Period End2020-12-31
Value200000.0
Percentage of FinanceLeaseInterestPaymentOnLiability100.0

us-gaap:FinanceLeasePrincipalPayments

us-gaap:FinanceLeasePrincipalPayments


Finance
Period End2020-12-31
Value600000.0
Percentage of FinanceLeasePrincipalPayments100.0

us-gaap:FinanceLeaseRightOfUseAssetAmortization

us-gaap:FinanceLeaseRightOfUseAssetAmortization


Finance
Period End2020-12-312020-09-30
Value700000.01300000.0
Percentage of FinanceLeaseRightOfUseAssetAmortization100.0100.0

us-gaap:GainLossOnDispositionOfAssets1

us-gaap:GainLossOnDispositionOfAssets1


Gain
Period End2020-12-312020-09-302020-06-30
Value0.06.914
Percentage of GainLossOnDispositionOfAssets10.0100.0100.0

us-gaap:IncomeLossFromDiscontinuedOperationsNetOfTax

us-gaap:IncomeLossFromDiscontinuedOperationsNetOfTax


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value0.0-2.1-12.0-0.20.8-3.6-3.8-17.5-9.22.7-2.012-0.3-13.4-71.15.9-0.2-0.4-1.4140.3-2.8-2.41.5-0.342-35.9-0.2-2.1-1.20.0-5.5-0.7-0.2-0.8-11.1-0.4-0.8
Percentage of IncomeLossFromDiscontinuedOperationsNetOfTax0.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncomeLossFromDiscontinuedOperationsNetOfTax us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations

awi:EuropeMiddleEastAndAfricaIncludingRussiaAndPacificRimBusinesses


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value0.0-2.1-12.0-0.20.0-3.6-4.1-22.5-9.12.7-3.17.4-0.2-13.8-69.16.2-2.2-4.7
Percentage of IncomeLossFromDiscontinuedOperationsNetOfTax0.0100.0100.0100.00.0100.0107.9128.698.9100.0155.061.766.7103.097.2105.11100.01175.0

awi:FlooringBusinesses


Income
Period End2020-12-312020-09-302020-06-302019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value0.00.00.80.35.0-0.11.14.6-0.10.4-1.35.9-0.2-0.4
Percentage of IncomeLossFromDiscontinuedOperationsNetOfTax-0.0-0.0100.0-7.9-28.61.1-55.038.333.3-3.01.8100.0100.0100.0

us-gaap:IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare

us-gaap:IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302012-12-312012-09-302012-06-302011-12-312011-09-30
Value0-0.04-0.2500.02-0.07-0.08-0.36-0.190.05-0.040.24-0.01-0.25-1.330.11-0.05-0.01-0.030.260.010.03-0.050.03-0.010.77-0.66-0.27-0.04-0.020-0.09-0.01-0.01-0.19-0.01-0.020.01
Percentage of IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare0.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare

us-gaap:IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302012-12-312012-09-302012-06-302011-12-312011-09-30
Value0-0.04-0.2500.02-0.07-0.08-0.35-0.190.05-0.040.23-0.01-0.25-1.320.11-0.04-0.01-0.030.260.010.03-0.040.03-0.010.76-0.65-0.27-0.04-0.020-0.09-0.01-0.01-0.19-0.01-0.020.01
Percentage of IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare0.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncomeLossFromEquityMethodInvestments

us-gaap:IncomeLossFromEquityMethodInvestments


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value2321151513191342211815182416151319181619191816191613131817141316141511151413101512166.41314
Percentage of IncomeLossFromEquityMethodInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInAccountsPayableAndAccruedLiabilities

us-gaap:IncreaseDecreaseInAccountsPayableAndAccruedLiabilities


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value17-9.28.95.5-0.4-25.87.1-2.5-19.5-5.0141.416-26.4153.7-11.3-28.36.11.8-21.8-68.2251035-22.0-22.9-9.832-6.1-17.0153216-17.62.512-21.3-33.20.73112-23.2-20.4
Percentage of IncreaseDecreaseInAccountsPayableAndAccruedLiabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInDeferredIncomeTaxes

us-gaap:IncreaseDecreaseInDeferredIncomeTaxes


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value-4.2-1.22.3-2.9-3.19323-25.7-7.2-5.013-10.22.5-1.565-16.6-9.0-27.4-23.0-24.5-5.01.59.69.0-2.1321.1-15.2-7.2-11.8-9.0-16.2-9.4-2.4
Percentage of IncreaseDecreaseInDeferredIncomeTaxes100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInIncomeTaxesPayableNetOfIncomeTaxesReceivable

us-gaap:IncreaseDecreaseInIncomeTaxesPayableNetOfIncomeTaxesReceivable


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312018-12-31
Value-2.95.56.87.18.31324-1.8
Percentage of IncreaseDecreaseInIncomeTaxesPayableNetOfIncomeTaxesReceivable100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInReceivables

us-gaap:IncreaseDecreaseInReceivables


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value1.412-12.5-1.5-11.212-3.3-10.017-3.5-4.7-1.115-22.59.70.91115-17.41.61227-21.7-9.53.125-30.7-17.33122-38.1-18.84035-50.2-10.91735-62.1-7.78.463-49.6-10.4
Percentage of IncreaseDecreaseInReceivables100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LitigationSettlementAmountAwardedFromOtherParty us-gaap:IncomeStatementLocation

us-gaap:LitigationSettlementAmountAwardedFromOtherParty

us-gaap:SellingGeneralAndAdministrativeExpenses


Litigation
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312017-09-30
Value7.50.00.10.10.4-0.20.21.91.5
Percentage of LitigationSettlementAmountAwardedFromOtherParty100.00.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OciBeforeReclassificationsNetOfTaxAttributableToParent

us-gaap:OciBeforeReclassificationsNetOfTaxAttributableToParent


Oci
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
Value3.35.98.9-3.3-0.7-5.12.5-5.6-7.00.4-53.1-8.0-19.07.8164.70.6115.9-0.6-12.0-3.3-19.7
Percentage of OciBeforeReclassificationsNetOfTaxAttributableToParent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OciBeforeReclassificationsNetOfTaxAttributableToParent us-gaap:StatementEquityComponents

us-gaap:AccumulatedDefinedBenefitPlansAdjustment


Oci
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value-2.4-0.10.08.6-0.10.10.70.7-43.5-0.30.1-1.011-1.8-0.7-0.117-0.33.4-0.3-16.9
Percentage of OciBeforeReclassificationsNetOfTaxAttributableToParent-27.03.0-0.0-168.6-4.0-1.8-10.0175.081.93.8-0.5-12.872.1-38.3-116.7-0.9294.950.0-28.39.185.8

us-gaap:AccumulatedGainLossNetCashFlowHedgeParent


Oci
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value2.85.33.33.0-0.8-11.62.1-3.1-8.4
Percentage of OciBeforeReclassificationsNetOfTaxAttributableToParent84.889.837.1-90.9114.3227.584.055.4120.0

us-gaap:AccumulatedTranslationAdjustment


Oci
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
Value0.50.67.999999999999999-6.20.1-2.10.5-2.60.75.3-5.7-7.0-20.85.93.67.02.811-19.4-2.0-13.21.4-4.2
Percentage of OciBeforeReclassificationsNetOfTaxAttributableToParent15.210.289.9187.9-14.341.220.046.4-10.01325.010.787.5109.575.621.8148.9466.798.2-328.8333.3110.0-42.421.3

us-gaap:OperatingLeaseCost

us-gaap:OperatingLeaseCost


Operating
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value1400000.0700000.01800000.01700000.01800000.01700000.01700000.01600000.0
Percentage of OperatingLeaseCost100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingLeasePayments

us-gaap:OperatingLeasePayments


Operating
Period End2020-12-312019-12-31
Value1200000.01800000.0
Percentage of OperatingLeasePayments100.0100.0

us-gaap:OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentBeforeTaxPortionAttributableToParent us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents

us-gaap:OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentBeforeTaxPortionAttributableToParent

us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:AccumulatedDefinedBenefitPlansAdjustment


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value-0.3-0.30.91.0-0.9-376.6-18.42.62.72.7-25.13.63.73.6
Percentage of OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentBeforeTaxPortionAttributableToParent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents

us-gaap:OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent

us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:AccumulatedDefinedBenefitPlansAdjustment


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value-0.2-0.20.00.70.7-279.721-5.4-2.2-2.120-3.0-3.02.83.0162.72.68.07.25.88.1
Percentage of OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossBeforeReclassificationsTax

us-gaap:OtherComprehensiveIncomeLossBeforeReclassificationsTax


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-31
Value0.91.70.91.1-0.4-1.1-8.61.02.11.713-0.60.1-0.7-4.60.9-13.8-3.15.9-1.8-6.34.3-2.5-0.1-78.2
Percentage of OtherComprehensiveIncomeLossBeforeReclassificationsTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossBeforeReclassificationsTax us-gaap:StatementEquityComponents

us-gaap:AccumulatedDefinedBenefitPlansAdjustment


Other
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-31
Value-0.10.20.02.92.5-0.1-0.8-0.2110.1-0.10.3-4.2-9.4-1.7-0.20.4-7.44.0-3.20.2-77.5
Percentage of OtherComprehensiveIncomeLossBeforeReclassificationsTax-11.118.2-0.0-263.6-29.1-10.0-38.1-11.884.0-16.7-100.0-42.991.368.154.8-3.4-22.2117.593.0128.0-200.099.1

us-gaap:AccumulatedGainLossNetCashFlowHedgeParent


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value0.91.71.00.9-0.4-4.00.7-1.1-2.9
Percentage of OtherComprehensiveIncomeLossBeforeReclassificationsTax100.0100.0111.181.8100.0363.6-8.1-110.0-138.1

us-gaap:OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationReclassificationAdjustmentFromAOCIRealizedUponSaleOrLiquidationNetOfTax us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations

us-gaap:OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationReclassificationAdjustmentFromAOCIRealizedUponSaleOrLiquidationNetOfTax

awi:EuropeanResilientFlooring


Other
Period End2020-12-312020-09-302020-06-30
Value00800000.0
Percentage of OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationReclassificationAdjustmentFromAOCIRealizedUponSaleOrLiquidationNetOfTax0.00.0100.0

us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent

us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent


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
Value1.84.60.5-5.5-2.62743.581-4.53.0-50.4-4.8-15.71120213.013126.6-6.110-2.6
Percentage of OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent us-gaap:StatementEquityComponents

us-gaap:AccumulatedDefinedBenefitPlansAdjustment


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
Value0.20.2-2.4-0.8-0.72882.05.52.92.8-40.52.73.11.814142.02.5256.99.27.80.7
Percentage of OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent11.14.3-480.014.526.9105.157.16.8-64.493.380.4-56.2-19.715.773.868.166.718.2206.5104.5-150.872.2-26.9

us-gaap:AccumulatedGainLossNetCashFlowHedgeParent


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value1.13.81.81.5-2.0-11.82.0-2.7-8.1
Percentage of OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent61.182.6360.0-27.376.9-4.357.1-3.3180.0

us-gaap:AccumulatedTranslationAdjustment


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
Value0.50.61.099999999999999-6.20.1-2.1-0.5780.75.3-5.7-7.0-20.85.93.67.02.811-19.4-2.0-13.21.4-4.2
Percentage of OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent27.813.0220.0112.7-3.8-0.8-14.396.6-15.6176.711.3145.8132.551.317.833.393.381.0-157.7-30.3216.413.0161.5

us-gaap:OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax

us-gaap:OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value-0.2-0.22.40.80.7-288.3-2.0-5.5-2.9-2.840-2.7-3.1-1.8-14.9-14.3-2.0-2.5-25.4-6.9-9.2-7.8-0.7-11.1-9.2-11.9112-8.5-5.7-7.1-71.3-3.9-6.0-8.965-2.7-2.5-2.488-2.8-3.2-3.3
Percentage of OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansTax us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents

us-gaap:OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansTax

us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:AccumulatedDefinedBenefitPlansAdjustment


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value0.10.1-0.9-0.30.2960.50.70.50.60.60.80.70.81.58.91.31.42.83.74.92.7
Percentage of OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship

us-gaap:OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax

us-gaap:InterestRateSwap, us-gaap:CashFlowHedging


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value3.77.04.33.9-1.2-15.62.9-4.2-11.3-7.4-6.60.31.03.3
Percentage of OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship

us-gaap:CashFlowHedging


Other
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value4.33.9-1.2-15.62.9-4.2-11.3-7.4-5.80.01.63.7
Percentage of OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax100.0100.0100.0100.0100.0100.0100.0100.087.90.0160.0112.1

us-gaap:OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax

us-gaap:OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax


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
Value1.13.81.81.5-2.0-11.82.0-2.7-8.1-5.1-4.2-0.52.03.81.7-0.3-1.80.16.31.7-2.11.60.90.9-0.6-0.5-2.04.9-5.6-0.64.7-2.7124.32.0-2.9-2.0-2.3-1.9-4.7-3.51.1
Percentage of OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherNoncashIncomeExpense

us-gaap:OtherNoncashIncomeExpense


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value-300000.0-200000.0-200000.0-200000.0-300000.0-200000.0-200000.0-1300000.0-800000.0-200000.0-1500000.0500000.0-1900000.0800000.0-2700000.0100000.0100000.0300000.0-3900000.05300000.0-400000.0-700000.0001000000.0600000.014300000.0-8500000.03700000.0-6800000.0-1200000.06400000.0-1200000.0-3300000.01500000.04400000.0100000.0-4600000.003500000.0-5600000.0700000.0-2900000.02000000.0
Percentage of OtherNoncashIncomeExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0

us-gaap:PaymentsForProceedsFromOtherInvestingActivities

us-gaap:PaymentsForProceedsFromOtherInvestingActivities


Payments
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-03-312018-12-312017-12-312017-09-302016-12-312016-09-302015-12-312015-09-30
Value400000.0300000.0-400000.0-2600000.0-3800000.0-200000.0-300000.02900000.00001000000.00
Percentage of PaymentsForProceedsFromOtherInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.00.00.00.0100.00.0

us-gaap:PaymentsToAcquireBusinessesGross us-gaap:BusinessAcquisition

us-gaap:PaymentsToAcquireBusinessesGross

awi:ArkturaLLC


Payments
Period End2020-12-16
Value90
Percentage of PaymentsToAcquireBusinessesGross100.0

awi:MozDesignsInc


Payments
Period End2020-08-24
Value4.2
Percentage of PaymentsToAcquireBusinessesGross0.0

awi:TURFDesignInc


Payments
Period End2020-07-27
Value70
Percentage of PaymentsToAcquireBusinessesGross0.0

us-gaap:PaymentsToAcquireBusinessesGross us-gaap:BusinessAcquisition, us-gaap:SubsequentEventType

awi:TURFDesignInc, us-gaap:SubsequentEvent


Payments
Period End2020-07-27
Value70
Percentage of PaymentsToAcquireBusinessesGross0.0

us-gaap:ProceedsFromBankDebt

us-gaap:ProceedsFromBankDebt


Proceeds
Period End2020-12-312020-09-302020-06-302020-03-31
Value0.00.00.030
Percentage of ProceedsFromBankDebt0.00.00.0100.0

us-gaap:ProceedsFromDividendsReceived us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

us-gaap:ProceedsFromDividendsReceived

awi:WorthingtonArmstrongVenture


Proceeds
Period End2020-12-312018-09-30
Value0.035
Percentage of ProceedsFromDividendsReceived0.0100.0

us-gaap:ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital

us-gaap:ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital


Proceeds
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-31
Value191620192418202518195253191616171519181931171619121517
Percentage of ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProceedsFromLifeInsurancePolicies

us-gaap:ProceedsFromLifeInsurancePolicies


Proceeds
Period End2020-09-30
Value5700000.0
Percentage of ProceedsFromLifeInsurancePolicies100.0

us-gaap:ProceedsFromLinesOfCredit

us-gaap:ProceedsFromLinesOfCredit


Proceeds
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value2550120700.0100650.010.068250.00.05040
Percentage of ProceedsFromLinesOfCredit100.0100.0100.0100.00.0100.0100.00.0100.0100.0100.00.00.0100.0100.0

us-gaap:ProceedsFromSaleOfProductiveAssets

us-gaap:ProceedsFromSaleOfProductiveAssets


Proceeds
Period End2020-12-312016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312012-12-312011-12-312011-09-302010-12-312010-09-30
Value2.60.10.00.00.02.86.10.10.80.90.02.22.13.0150.3
Percentage of ProceedsFromSaleOfProductiveAssets100.0100.00.00.00.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0

us-gaap:ProceedsFromSaleOfPropertyPlantAndEquipment us-gaap:StatementBusinessSegments

us-gaap:ProceedsFromSaleOfPropertyPlantAndEquipment

awi:UnallocatedCorporate


Proceeds
Period End2020-09-30
Value2400000.0
Percentage of ProceedsFromSaleOfPropertyPlantAndEquipment100.0

us-gaap:ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome

us-gaap:ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax

us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome


Reclassification
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value-1.5-1.3-8.4-2.2-1.92791.0872.52.6-6.4-7.2-34.114-73.510.010105.76.25.75.06.46.56.77.9
Percentage of ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent

us-gaap:ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent


Reclassification
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
Value1500000.01300000.08400000.02200000.01900000.0-279500000.0-1000000.0-87000000.0-2500000.0-2600000.0-2700000.0-3200000.0-3300000.0-3700000.0-3700000.0-16300000.0-2400000.0-2400000.0-6400000.0-7200000.0-5900000.0-14100000.0-17100000.0
Percentage of ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent us-gaap:StatementEquityComponents

us-gaap:AccumulatedDefinedBenefitPlansAdjustment


Reclassification
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
Value-200000.0-200000.00700000.0700000.0-279700000.0-2100000.0-5400000.0-2200000.0-2100000.0-3000000.0-3000000.0-3000000.0-2800000.0-3000000.0-16100000.0-2700000.0-2600000.0-8000000.0-7200000.0-5800000.0-8100000.0-17600000.0
Percentage of ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent-13.3-15.40.031.836.8100.1210.06.288.080.8111.193.890.975.781.198.8112.5108.3125.0100.098.357.4102.9

us-gaap:AccumulatedGainLossNetCashFlowHedgeParent


Reclassification
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value1700000.01500000.01500000.01500000.01200000.0200000.0100000.0-400000.0-300000.0
Percentage of ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent113.3115.417.968.263.2-0.1-10.00.512.0

us-gaap:RepaymentsOfBankDebt

us-gaap:RepaymentsOfBankDebt


Repayments
Period End2020-12-31
Value0.0
Percentage of RepaymentsOfBankDebt0.0

us-gaap:RepaymentsOfLinesOfCredit

us-gaap:RepaymentsOfLinesOfCredit


Repayments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312012-12-312012-03-312011-12-312011-03-31
Value5050801565200.0256810.00.00.050401.31.40.025
Percentage of RepaymentsOfLinesOfCredit100.0100.0100.0100.0100.0100.00.0100.0100.0100.00.00.0100.0100.0100.0100.00.0100.0

us-gaap:RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability

us-gaap:RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability


Right
Period End2020-12-31
Value-4900000.0
Percentage of RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability100.0

us-gaap:RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability

us-gaap:RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability


Right
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value1.30000000000000052.99999999999999960.50.62.23.86.429
Percentage of RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:TreasuryStockAcquiredAverageCostPerShare us-gaap:ShareRepurchaseProgram, us-gaap:StatementEquityComponents

us-gaap:TreasuryStockAcquiredAverageCostPerShare

awi:ShareRepurchaseProgramExcludingAcceleratedShareRepurchase, us-gaap:CommonStock


Treasury
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value14.1279.6-2.720089.994.4495.2613.9460.32.33
Percentage of TreasuryStockAcquiredAverageCostPerShare100.0100.0100.00.00.0100.0100.0100.0100.0100.0100.0

awi:ShareRepurchaseProgramIncludingAcceleratedShareRepurchase, us-gaap:CommonStock


Treasury
Period End2021-03-312020-06-302020-03-312019-12-312019-09-30
Value62.57062.132.041.52
Percentage of TreasuryStockAcquiredAverageCostPerShare78.60.069.045.91.6

us-gaap:TreasuryStockSharesAcquired us-gaap:ShareRepurchaseProgram, us-gaap:StatementEquityComponents

us-gaap:TreasuryStockSharesAcquired

awi:ShareRepurchaseProgramExcludingAcceleratedShareRepurchase, us-gaap:CommonStock


Treasury
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value200000.0100000.0100000.000400000.0500000.0300000.0300000.0300000.01200000.0
Percentage of TreasuryStockSharesAcquired100.0100.0100.00.00.0100.0100.0100.0100.0100.0100.0

awi:ShareRepurchaseProgramIncludingAcceleratedShareRepurchase, us-gaap:CommonStock


Treasury
Period End2021-03-312020-06-302020-03-312019-12-312019-09-30
Value9800000.009600000.0500000.0400000.0
Percentage of TreasuryStockSharesAcquired9800.00.02400.0100.0133.3

us-gaap:TreasuryStockValueAcquiredCostMethod

us-gaap:TreasuryStockValueAcquiredCostMethod


Treasury
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312013-12-31
Value2010.010.00.00.034503328208012135705.04.52050360.0
Percentage of TreasuryStockValueAcquiredCostMethod100.0100.0100.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0

us-gaap:TreasuryStockValueAcquiredCostMethod us-gaap:ShareRepurchaseProgram, us-gaap:StatementEquityComponents

awi:ShareRepurchaseProgramExcludingAcceleratedShareRepurchase, us-gaap:CommonStock


Treasury
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value2010.010.00.00.0345033282080
Percentage of TreasuryStockValueAcquiredCostMethod100.0100.0100.00.00.0100.099.8100.0100.0100.099.9

awi:ShareRepurchaseProgramIncludingAcceleratedShareRepurchase, us-gaap:CommonStock


Treasury
Period End2021-03-312020-06-302020-03-312019-12-312019-09-30
Value6160.05965033
Percentage of TreasuryStockValueAcquiredCostMethod6162.00.01733.199.8100.0

us-gaap:TreasuryStockValueAcquiredCostMethod us-gaap:StatementEquityComponents

us-gaap:TreasuryStock


Treasury
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312013-12-31
Value2010.010.00.00.034503328208012135705.04.52050360.0
Percentage of TreasuryStockValueAcquiredCostMethod100.0100.0100.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0

us-gaap:WeightedAverageNumberDilutedSharesOutstandingAdjustment

us-gaap:WeightedAverageNumberDilutedSharesOutstandingAdjustment


Weighted
Period End2021-06-302021-03-312020-09-302020-06-302019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-30
Value400000.0200000.0100000.0200000.0800000.0800000.0800000.01200000.0700000.0800000.0500000.0400000.0400000.0500000.0400000.0
Percentage of WeightedAverageNumberDilutedSharesOutstandingAdjustment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

awi:AccountsReceivableRelatedToSaleProceeds us-gaap:StatementBusinessSegments

awi:AccountsReceivableRelatedToSaleProceeds

awi:UnallocatedCorporate


Accounts
Period End2020-09-30
Value2400000.0
Percentage of AccountsReceivableRelatedToSaleProceeds100.0

awi:AcquisitionRelatedContingentConsideration

awi:AcquisitionRelatedContingentConsideration


Acquisition
Period End2021-03-312020-12-31
Value1716
Percentage of AcquisitionRelatedContingentConsideration100.0100.0

awi:AssetsExcludingAssetsDiscontinuedOperations

awi:AssetsExcludingAssetsDiscontinuedOperations


Assets
Period End2020-12-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-312014-12-31
Value1718149315091613163315941712152615071567175818121755
Percentage of AssetsExcludingAssetsDiscontinuedOperations100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

awi:AssetsExcludingAssetsDiscontinuedOperations us-gaap:ConsolidationItems

us-gaap:CorporateNonSegment


Assets
Period End2020-12-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-312014-12-31
Value259191218337368413500296287320150238165
Percentage of AssetsExcludingAssetsDiscontinuedOperations15.112.814.520.922.625.929.219.419.120.58.613.19.4

awi:AssetsExcludingAssetsDiscontinuedOperations us-gaap:StatementBusinessSegments

awi:ArchitecturalSpecialties


Assets
Period End2020-12-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-31
Value35716114915314784846355531717
Percentage of AssetsExcludingAssetsDiscontinuedOperations20.810.89.99.59.05.34.94.23.73.41.00.9

awi:MineralFiber


Assets
Period End2020-12-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-31
Value110111391141112211181096112611661165119311451132
Percentage of AssetsExcludingAssetsDiscontinuedOperations64.176.375.669.668.468.865.876.477.376.165.162.5

awi:BusinessCombinationContingentConsiderationMaximumEarnoutPayable us-gaap:BusinessAcquisition

awi:BusinessCombinationContingentConsiderationMaximumEarnoutPayable

awi:MozDesignsInc


Business
Period End2020-08-24
Value4.7
Percentage of BusinessCombinationContingentConsiderationMaximumEarnoutPayable100.0

awi:TURFDesignInc


Business
Period End2020-07-27
Value48
Percentage of BusinessCombinationContingentConsiderationMaximumEarnoutPayable0.0

awi:ContingentConsideration us-gaap:FairValueByFairValueHierarchyLevel

awi:ContingentConsideration

us-gaap:FairValueInputsLevel3


Contingent
Period End2020-09-30
Value-15900000.0
Percentage of ContingentConsideration100.0

awi:ContingentConsideration us-gaap:FairValueByMeasurementBasis

us-gaap:CarryingReportedAmountFairValueDisclosure


Contingent
Period End2020-09-30
Value-15900000.0
Percentage of ContingentConsideration100.0

us-gaap:EstimateOfFairValueFairValueDisclosure


Contingent
Period End2020-09-30
Value-15900000.0
Percentage of ContingentConsideration100.0

awi:DeferredTaxAssetsLeaseRightOfUseLiabilities

awi:DeferredTaxAssetsLeaseRightOfUseLiabilities


Deferred
Period End2020-12-312019-12-31
Value10000000.09000000.0
Percentage of DeferredTaxAssetsLeaseRightOfUseLiabilities100.0100.0

awi:DeferredTaxAssetsTaxCreditCarryforwardsForeignGross us-gaap:IncomeTaxAuthority

awi:DeferredTaxAssetsTaxCreditCarryforwardsForeignGross

us-gaap:DomesticCountry


Deferred
Period End2020-12-312019-12-312018-12-312016-12-312015-12-31
Value1713192227
Percentage of DeferredTaxAssetsTaxCreditCarryforwardsForeignGross100.0100.0100.0100.0100.0

awi:DeferredTaxAssetsTaxCreditCarryforwardsForeignNet

awi:DeferredTaxAssetsTaxCreditCarryforwardsForeignNet


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value1713191519
Percentage of DeferredTaxAssetsTaxCreditCarryforwardsForeignNet100.0100.0100.0100.0100.0

awi:DeferredTaxLiabilitiesLeaseRightOfUseAssets

awi:DeferredTaxLiabilitiesLeaseRightOfUseAssets


Deferred
Period End2020-12-312019-12-31
Value109.0
Percentage of DeferredTaxLiabilitiesLeaseRightOfUseAssets100.0100.0

awi:EnvironmentalInsuranceRecoveriesReceivedInExcessOfCumulativeExpensesIncurredNoncurrent

awi:EnvironmentalInsuranceRecoveriesReceivedInExcessOfCumulativeExpensesIncurredNoncurrent


Environmental
Period End2021-06-302020-12-31
Value4600000.05000000.0
Percentage of EnvironmentalInsuranceRecoveriesReceivedInExcessOfCumulativeExpensesIncurredNoncurrent100.0100.0

awi:FinanceLeaseLiabilityPaymentsDueAfterYearFour

awi:FinanceLeaseLiabilityPaymentsDueAfterYearFour


Finance
Period End2020-12-312020-09-30
Value1214
Percentage of FinanceLeaseLiabilityPaymentsDueAfterYearFour100.0100.0

awi:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFour

awi:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFour


Lessee
Period End2020-09-30
Value7700000.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFour100.0

awi:PayableForPurchasePriceAdjustments dei:LegalEntity

awi:PayableForPurchasePriceAdjustments

awi:Knauf


Payable
Period End2020-12-312020-06-302020-03-312019-12-31
Value116.26.21.2
Percentage of PayableForPurchasePriceAdjustments100.0100.0100.0100.0

awi:PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNet us-gaap:RetirementPlanType

awi:PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNet

awi:NonUSDefinedBenefitPensionPlans


Pension
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value-2.9-2.8-2.5-2.7-2.5
Percentage of PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNet100.0100.0100.0100.0100.0

awi:RetireeHealthAndLifeInsuranceBenefits


Pension
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value-81.4-77.5-65.4-86.6-93.1
Percentage of PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNet2806.92767.92616.03207.43724.0

awi:USDefinedBenefitPensionPlans


Pension
Period End2020-12-312019-12-312018-12-312017-12-31
Value79470.729
Percentage of PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNet-2724.1-1678.6-28.0-1096.3

awi:PercentageOfDifferenceInCarryingValueOfInvestmentRecordedInDiscontinuedOperation us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

awi:PercentageOfDifferenceInCarryingValueOfInvestmentRecordedInDiscontinuedOperation

awi:WorthingtonArmstrongVenture


Percentage
Period End2020-12-31
Value50.0
Percentage of PercentageOfDifferenceInCarryingValueOfInvestmentRecordedInDiscontinuedOperation100.0

awi:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableVestedAndExpectedToVestOutstandingAggregateIntrinsicValue

awi:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableVestedAndExpectedToVestOutstandingAggregateIntrinsicValue


Share
Period End2020-12-31
Value4500000.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableVestedAndExpectedToVestOutstandingAggregateIntrinsicValue100.0

awi:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableVestedAndExpectedToVestOutstandingNumber

awi:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableVestedAndExpectedToVestOutstandingNumber


Share
Period End2020-12-31
Value139600.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableVestedAndExpectedToVestOutstandingNumber100.0

awi:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice

awi:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice


Share
Period End2020-12-31
Value42.41
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice100.0

awi:StockRepurchaseProgramAdditionalAuthorizedAmount us-gaap:StatementEquityComponents, us-gaap:SubsequentEventType

awi:StockRepurchaseProgramAdditionalAuthorizedAmount

us-gaap:CommonStock, us-gaap:SubsequentEvent


Stock
Period End2020-07-282018-07-31
Value500300
Percentage of StockRepurchaseProgramAdditionalAuthorizedAmount100.0100.0

awi:UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRateNetOfFederalBenefit

awi:UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRateNetOfFederalBenefit


Unrecognized
Period End2020-12-31
Value17
Percentage of UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRateNetOfFederalBenefit100.0

us-gaap:AccountsNotesAndLoansReceivableNetCurrent

us-gaap:AccountsNotesAndLoansReceivableNetCurrent


Accounts
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302018-12-31
Value9291789010696858879
Percentage of AccountsNotesAndLoansReceivableNetCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent us-gaap:RetirementPlanType

us-gaap:AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent

awi:RetireeHealthAndLifeInsuranceBenefits


Accounts
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value6.56.56.67.48.3
Percentage of AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent100.0100.0100.0100.0100.0

awi:USDefinedBenefitPensionPlans


Accounts
Period End2020-12-312019-12-312018-12-312017-12-31
Value2.93.94.34.1
Percentage of AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent44.660.065.255.4

us-gaap:AccountsPayableOtherCurrent

us-gaap:AccountsPayableOtherCurrent


Accounts
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-312014-12-312013-12-312013-09-302012-12-312011-12-31
Value17121611111210.09.31022117.96.16.411292524303436494943584852
Percentage of AccountsPayableOtherCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AccountsPayableTradeCurrent

us-gaap:AccountsPayableTradeCurrent


Accounts
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-312014-12-312013-12-312013-09-302012-12-312011-12-31
Value878081696062797471768272716467100101102108115118234224250261216209
Percentage of AccountsPayableTradeCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AccountsReceivableGrossCurrent

us-gaap:AccountsReceivableGrossCurrent


Accounts
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302011-12-31
Value959277837691828597857075827562131135126106129130232198222234229209271296263242281295262228281311263
Percentage of AccountsReceivableGrossCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AccrualForEnvironmentalLossContingencies

us-gaap:AccrualForEnvironmentalLossContingencies


Accrual
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
Value1.00.91.21.51.51.51.62.1111212131313135.25.55.14.74.83.55.06.03.55.54.34.47.27.87.98.37.78.29.61010117.3
Percentage of AccrualForEnvironmentalLossContingencies100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AccrualForEnvironmentalLossContingencies us-gaap:BalanceSheetLocation

us-gaap:AccountsPayableAndAccruedLiabilities


Accrual
Period End2021-06-302020-12-312020-09-302019-12-312019-09-302019-06-302019-03-312018-12-31
Value0.50.30.50.10.69.79.60.7
Percentage of AccrualForEnvironmentalLossContingencies50.025.033.36.228.685.877.45.6

us-gaap:AccruedEnvironmentalLossContingenciesNoncurrent

us-gaap:AccruedEnvironmentalLossContingenciesNoncurrent


Accrued
Period End2021-03-312020-12-312020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-312016-12-312016-09-302015-12-31
Value4.95.01.51.51.61.62.811134.74.86.0
Percentage of AccruedEnvironmentalLossContingenciesNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AccruedIncomeTaxesNoncurrent

us-gaap:AccruedIncomeTaxesNoncurrent


Accrued
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value212121212020192027262639555353316154625599949278655351454239818374696366383836353534
Percentage of AccruedIncomeTaxesNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax

us-gaap:AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax


Accumulated
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value-19000000.0-8500000.05300000.03500000.03800000.0-3300000.0-4000000.0-700000.0-19200000.0-14000000.0
Percentage of AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax

us-gaap:AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax


Accumulated
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value92377390302336450483392482424
Percentage of AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax

us-gaap:AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax


Accumulated
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value2.39.4-74.7-47.1-71.6-33.8-8.3213023
Percentage of AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AllowanceForDoubtfulAccountsReceivableCurrent

us-gaap:AllowanceForDoubtfulAccountsReceivableCurrent


Allowance
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302011-12-31
Value4.14.33.63.63.23.12.32.93.13.22.02.54.43.61.95.65.76.26.17.49.62724242524252728272829283535403940
Percentage of AllowanceForDoubtfulAccountsReceivableCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AlternativeInvestment

us-gaap:AlternativeInvestment


Alternative
Period End2020-12-312019-12-312018-12-312017-12-31
Value7.8106463
Percentage of AlternativeInvestment100.0100.0100.0100.0

us-gaap:AlternativeInvestment us-gaap:InvestmentType

us-gaap:RealEstate


Alternative
Period End2020-12-312019-12-312018-12-312017-12-31
Value7.8106059
Percentage of AlternativeInvestment100.0100.093.994.3

us-gaap:AssetsHeldForSaleNotPartOfDisposalGroupCurrent

us-gaap:AssetsHeldForSaleNotPartOfDisposalGroupCurrent


Assets
Period End2021-06-302021-03-312020-03-312019-12-31
Value4600000.04600000.06500000.06600000.0
Percentage of AssetsHeldForSaleNotPartOfDisposalGroupCurrent100.0100.0100.0100.0

us-gaap:BuildingsAndImprovementsGross

us-gaap:BuildingsAndImprovementsGross


Buildings
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-31
Value255239232224261381373
Percentage of BuildingsAndImprovementsGross100.0100.0100.0100.0100.0100.0100.0

us-gaap:BusinessAcquisitionEquityInterestIssuedOrIssuableValueAssigned us-gaap:TitleOfIndividual, us-gaap:AwardType, us-gaap:BusinessAcquisition

us-gaap:BusinessAcquisitionEquityInterestIssuedOrIssuableValueAssigned

awi:ArkturaEmployee, us-gaap:RestrictedStock, awi:ArkturaLLC


Business
Period End2020-12-16
Value1400000.0
Percentage of BusinessAcquisitionEquityInterestIssuedOrIssuableValueAssigned100.0

awi:ArkturaSeller, us-gaap:RestrictedStock, awi:ArkturaLLC


Business
Period End2020-12-16
Value6000000.0
Percentage of BusinessAcquisitionEquityInterestIssuedOrIssuableValueAssigned428.6

us-gaap:BusinessCombinationContingentConsiderationLiability

us-gaap:BusinessCombinationContingentConsiderationLiability


Business
Period End2021-06-302020-09-30
Value5.615
Percentage of BusinessCombinationContingentConsiderationLiability100.0100.0

us-gaap:BusinessCombinationContingentConsiderationLiability us-gaap:BusinessAcquisition

awi:MozDesignsInc


Business
Period End2020-08-24
Value2.5
Percentage of BusinessCombinationContingentConsiderationLiability0.0

awi:TURFDesignInc


Business
Period End2020-07-27
Value13
Percentage of BusinessCombinationContingentConsiderationLiability0.0

us-gaap:BusinessCombinationContingentConsiderationLiability us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:FairValueInputsLevel3


Business
Period End2021-06-302021-03-312020-12-31
Value7.41716
Percentage of BusinessCombinationContingentConsiderationLiability132.10.00.0

us-gaap:BusinessCombinationContingentConsiderationLiability us-gaap:FairValueByMeasurementBasis

us-gaap:CarryingReportedAmountFairValueDisclosure


Business
Period End2021-06-302021-03-312020-12-31
Value7.41716
Percentage of BusinessCombinationContingentConsiderationLiability132.10.00.0

us-gaap:EstimateOfFairValueFairValueDisclosure


Business
Period End2021-06-302021-03-312020-12-31
Value7.41716
Percentage of BusinessCombinationContingentConsiderationLiability132.10.00.0

us-gaap:BusinessCombinationContingentConsiderationLiability us-gaap:Range, us-gaap:BusinessAcquisition

srt:Maximum, awi:MozDesignsInc


Business
Period End2020-08-24
Value4.7
Percentage of BusinessCombinationContingentConsiderationLiability0.0

us-gaap:BusinessCombinationContingentConsiderationLiabilityNoncurrent

us-gaap:BusinessCombinationContingentConsiderationLiabilityNoncurrent


Business
Period End2021-06-302020-12-31
Value1.816
Percentage of BusinessCombinationContingentConsiderationLiabilityNoncurrent100.0100.0

us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill us-gaap:BusinessAcquisition

us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill

awi:ArkturaLLC


Business
Period End2020-12-16
Value36
Percentage of BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill100.0

awi:MozDesignsInc


Business
Period End2020-08-24
Value3.2
Percentage of BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill0.0

awi:TURFDesignInc


Business
Period End2020-07-27
Value27
Percentage of BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill0.0

us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill us-gaap:BusinessAcquisition, us-gaap:FiniteLivedIntangibleAssetsByMajorClass

awi:ArkturaLLC, us-gaap:ComputerSoftwareIntangibleAsset


Business
Period End2020-12-16
Value9.1
Percentage of BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill25.1

awi:ArkturaLLC, us-gaap:CustomerRelationships


Business
Period End2020-12-16
Value3.6
Percentage of BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill9.9

awi:ArkturaLLC, us-gaap:NoncompeteAgreements


Business
Period End2020-12-16
Value2.1
Percentage of BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill5.8

awi:ArkturaLLC, us-gaap:OrderOrProductionBacklog


Business
Period End2020-12-16
Value5.5
Percentage of BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill15.2

awi:ArkturaLLC, us-gaap:Patents


Business
Period End2020-12-16
Value0.6
Percentage of BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill1.7

awi:ArkturaLLC, us-gaap:TradeNames


Business
Period End2020-12-16
Value12
Percentage of BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill33.4

awi:TURFDesignInc, us-gaap:NoncompeteAgreements


Business
Period End2020-07-27
Value3.3
Percentage of BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill0.0

awi:TURFDesignInc, us-gaap:Patents


Business
Period End2020-07-27
Value5.8
Percentage of BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill0.0

us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill us-gaap:BusinessAcquisition, us-gaap:IndefiniteLivedIntangibleAssetsByMajorClass

awi:ArkturaLLC, us-gaap:CustomerRelationships


Business
Period End2020-12-16
Value3.3
Percentage of BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill9.1

awi:ArkturaLLC, us-gaap:NoncompeteAgreements


Business
Period End2020-12-16
Value2.8
Percentage of BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill7.7

awi:ArkturaLLC, us-gaap:OrderOrProductionBacklog


Business
Period End2020-12-16
Value5.9
Percentage of BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill16.3

awi:ArkturaLLC, us-gaap:Patents


Business
Period End2020-12-16
Value0.6
Percentage of BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill1.7

awi:ArkturaLLC, us-gaap:SoftwareDevelopment


Business
Period End2020-12-16
Value9.1
Percentage of BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill25.1

awi:ArkturaLLC, us-gaap:TradeNames


Business
Period End2020-12-16
Value14
Percentage of BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill40.1

awi:MozDesignsInc, us-gaap:CustomerRelationships


Business
Period End2020-08-24
Value1.5
Percentage of BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill0.0

awi:MozDesignsInc, us-gaap:OrderOrProductionBacklog


Business
Period End2020-08-24
Value0.6
Percentage of BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill0.0

awi:MozDesignsInc, us-gaap:TradeNames


Business
Period End2020-08-24
Value1.7
Percentage of BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill0.0

awi:TURFDesignInc, us-gaap:CustomerRelationships


Business
Period End2020-07-27
Value7.7
Percentage of BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill0.0

awi:TURFDesignInc, us-gaap:TradeNames


Business
Period End2020-07-27
Value9.6
Percentage of BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill0.0

us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities us-gaap:BusinessAcquisition

us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities

awi:ArkturaLLC


Business
Period End2020-12-16
Value4100000.0
Percentage of BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities100.0

awi:MozDesignsInc


Business
Period End2020-08-24
Value500000.0
Percentage of BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities0.0

us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet us-gaap:BusinessAcquisition

us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet

awi:ArkturaLLC


Business
Period End2020-12-16
Value1800000.0
Percentage of BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet100.0

awi:TURFDesignInc


Business
Period End2020-07-27
Value4800000.0
Percentage of BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet0.0

us-gaap:CapitalizedComputerSoftwareGross

us-gaap:CapitalizedComputerSoftwareGross


Capitalized
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-31
Value41332320182318
Percentage of CapitalizedComputerSoftwareGross100.0100.0100.0100.0100.0100.0100.0

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations


Cash
Period End2020-12-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value1361171464598250283335337159
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CashSurrenderValueOfLifeInsurance

us-gaap:CashSurrenderValueOfLifeInsurance


Cash
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302018-12-312017-12-312016-12-312016-09-302016-06-302015-12-312014-12-312013-12-312013-09-302012-12-312011-12-31
Value475049515355545453525454525352605858
Percentage of CashSurrenderValueOfLifeInsurance100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DebtInstrumentCarryingAmount

us-gaap:DebtInstrumentCarryingAmount


Debt
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-31
Value718615825858883993
Percentage of DebtInstrumentCarryingAmount100.0100.0100.0100.0100.0100.0

us-gaap:DebtInstrumentCarryingAmount us-gaap:CreditFacility

us-gaap:RevolvingCreditFacility


Debt
Period End2020-12-312019-12-31
Value225115
Percentage of DebtInstrumentCarryingAmount31.318.7

us-gaap:DebtInstrumentCarryingAmount us-gaap:DebtInstrument

awi:TermLoanADueTwoThousandTwentyFour


Debt
Period End2020-12-312019-12-31
Value493500
Percentage of DebtInstrumentCarryingAmount68.781.3

us-gaap:DebtInstrumentFairValue us-gaap:FairValueByMeasurementBasis

us-gaap:DebtInstrumentFairValue

us-gaap:CarryingReportedAmountFairValueDisclosure


Debt
Period End2021-06-302021-03-312020-12-312020-09-302019-12-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-31
Value67870971568161081982783584285085786587387387387397810031013102410351042
Percentage of DebtInstrumentFairValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EstimateOfFairValueFairValueDisclosure


Debt
Period End2021-06-302021-03-312020-12-312020-09-302019-12-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-31
Value6787037156816108118288358478508588658698738678709779941007102210321028
Percentage of DebtInstrumentFairValue100.099.2100.0100.0100.099.0100.1100.1100.5100.1100.1100.099.6100.099.399.699.999.199.399.899.898.6

us-gaap:DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet

us-gaap:DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet


Debt
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-31
Value3200000.04200000.05800000.07900000.09500000.04700000.0
Percentage of DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet100.0100.0100.0100.0100.0100.0

us-gaap:DecreaseInUnrecognizedTaxBenefitsIsReasonablyPossible us-gaap:IncomeTaxAuthority

us-gaap:DecreaseInUnrecognizedTaxBenefitsIsReasonablyPossible

us-gaap:StateAndLocalJurisdiction


Decrease
Period End2020-12-31
Value200000.0
Percentage of DecreaseInUnrecognizedTaxBenefitsIsReasonablyPossible100.0

us-gaap:DeferredCompensationLiabilityClassifiedNoncurrent

us-gaap:DeferredCompensationLiabilityClassifiedNoncurrent


Deferred
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-312016-12-312016-09-302016-06-302016-03-312015-12-312014-12-312014-09-302013-12-312013-09-302012-12-312011-12-31
Value1715141413131414131414151617171818212122222324
Percentage of DeferredCompensationLiabilityClassifiedNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredCompensationPlanAssets

us-gaap:DeferredCompensationPlanAssets


Deferred
Period End2020-12-312019-12-312016-06-302015-12-31
Value9600000.02800000.02500000.01600000.0
Percentage of DeferredCompensationPlanAssets100.0100.0100.0100.0

us-gaap:DeferredCompensationSharebasedArrangementsLiabilityCurrentAndNoncurrent us-gaap:PlanName

us-gaap:DeferredCompensationSharebasedArrangementsLiabilityCurrentAndNoncurrent

awi:TwoThousandSixPhantomStockUnitPlan


Deferred
Period End2020-12-312015-12-31
Value1200000.01700000.0
Percentage of DeferredCompensationSharebasedArrangementsLiabilityCurrentAndNoncurrent100.0100.0

us-gaap:DeferredIncomeTaxLiabilities

us-gaap:DeferredIncomeTaxLiabilities


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-31
Value242233211218300340331400355
Percentage of DeferredIncomeTaxLiabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxAssetsCapitalLossCarryforwards

us-gaap:DeferredTaxAssetsCapitalLossCarryforwards


Deferred
Period End2020-12-312019-12-31
Value1916
Percentage of DeferredTaxAssetsCapitalLossCarryforwards100.0100.0

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
Value163155181144219351331549578595
Percentage of DeferredTaxAssetsGross100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

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
Value485458357183113230218247
Percentage of DeferredTaxAssetsOperatingLossCarryforwards100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal

us-gaap:DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-31
Value8.99.39.8109.19.75.96.0
Percentage of DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal100.0100.0100.0100.0100.0100.0100.0100.0

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
Value169.0171216434110010495
Percentage of DeferredTaxAssetsOther100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits

us-gaap:DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-31
Value9.010111217332325
Percentage of DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions

us-gaap:DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value12121416457434213017
Percentage of DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits

us-gaap:DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value22211823387587102105116
Percentage of DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxLiabilitiesDeferredExpenseCapitalizedInventoryCosts

us-gaap:DeferredTaxLiabilitiesDeferredExpenseCapitalizedInventoryCosts


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value4.44.55.54.48.82213152021
Percentage of DeferredTaxLiabilitiesDeferredExpenseCapitalizedInventoryCosts100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets

us-gaap:DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value93126132136211222229239245253
Percentage of DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxLiabilitiesInvestments

us-gaap:DeferredTaxLiabilitiesInvestments


Deferred
Period End2020-12-312019-12-31
Value2829
Percentage of DeferredTaxLiabilitiesInvestments100.0100.0

us-gaap:DeferredTaxLiabilitiesOther

us-gaap:DeferredTaxLiabilitiesOther


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value0.20.20.21.79.110119.85.310
Percentage of DeferredTaxLiabilitiesOther100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxLiabilitiesPrepaidExpenses

us-gaap:DeferredTaxLiabilitiesPrepaidExpenses


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value3024112018
Percentage of DeferredTaxLiabilitiesPrepaidExpenses100.0100.0100.0100.0100.0

us-gaap:DeferredTaxLiabilitiesPropertyPlantAndEquipment

us-gaap:DeferredTaxLiabilitiesPropertyPlantAndEquipment


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-31
Value75696256518477
Percentage of DeferredTaxLiabilitiesPropertyPlantAndEquipment100.0100.0100.0100.0100.0100.0100.0

us-gaap:DefinedBenefitPensionPlanCurrentAndNoncurrentLiabilities us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPensionPlanCurrentAndNoncurrentLiabilities

awi:NonUSDefinedBenefitPensionPlans


Defined
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value2.82.72.52.62.5
Percentage of DefinedBenefitPensionPlanCurrentAndNoncurrentLiabilities100.0100.0100.0100.0100.0

awi:USDefinedBenefitPensionPlans


Defined
Period End2020-12-312019-12-312018-12-312017-12-31
Value37434754
Percentage of DefinedBenefitPensionPlanCurrentAndNoncurrentLiabilities1342.91625.91912.02100.0

us-gaap:DefinedBenefitPensionPlanLiabilitiesNoncurrent

us-gaap:DefinedBenefitPensionPlanLiabilitiesNoncurrent


Defined
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value393940454545464849495055565657908987867961991079393100115207220223225246241239247198195206206204214202
Percentage of DefinedBenefitPensionPlanLiabilitiesNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DefinedBenefitPlanAccumulatedBenefitObligation us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanAccumulatedBenefitObligation

awi:NonUSDefinedBenefitPensionPlans


Defined
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value2.92.82.52.72.5
Percentage of DefinedBenefitPlanAccumulatedBenefitObligation100.0100.0100.0100.0100.0

awi:USDefinedBenefitPensionPlans


Defined
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value4391429135614961518
Percentage of DefinedBenefitPlanAccumulatedBenefitObligation15158.651053.654272.055422.260720.0

us-gaap:DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax

awi:RetireeHealthAndLifeInsuranceBenefits


Defined
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value1934605051
Percentage of DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax100.0100.0100.0100.0100.0

awi:USDefinedBenefitPensionPlans


Defined
Period End2020-12-312019-12-312018-12-312017-12-31
Value-142.6-540.7-577.3-520.2
Percentage of DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax-727.6-1553.7-955.8-1028.1

us-gaap:DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax

awi:RetireeHealthAndLifeInsuranceBenefits


Defined
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value-17.9-32.8-59.3-49.5-51.7
Percentage of DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax100.0100.0100.0100.0100.0

awi:USDefinedBenefitPensionPlans


Defined
Period End2020-12-312019-12-312018-12-312017-12-31
Value142540577520
Percentage of DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax-796.6-1648.5-973.5-1050.9

us-gaap:DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax

awi:RetireeHealthAndLifeInsuranceBenefits


Defined
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value1700000.02000000.01100000.01100000.0100000.0
Percentage of DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax100.0100.0100.0100.0100.0

us-gaap:DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent

us-gaap:DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent


Defined
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value12112011911611511394726659521221119988917968568.38.28.48.321106.97.42001891781677160503985766758169156130
Percentage of DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent us-gaap:RetirementPlanType

awi:USDefinedBenefitPensionPlans


Defined
Period End2020-12-312019-12-312018-12-312017-12-31
Value119945288
Percentage of DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent100.0100.0100.0100.0

us-gaap:DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate

awi:RetireeHealthAndLifeInsuranceBenefits


Defined
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value2.370.03140.04310.0360.041
Percentage of DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate100.0100.0100.0100.0100.0

awi:USDefinedBenefitPensionPlans


Defined
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value2.680.03160.0430.03630.0412
Percentage of DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate113.1100.699.8100.8100.5

us-gaap:DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncrease us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncrease

awi:USDefinedBenefitPensionPlans


Defined
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value3.050.03050.03050.03050.031
Percentage of DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncrease100.0100.0100.0100.0100.0

us-gaap:DefinedBenefitPlanBenefitObligation

us-gaap:DefinedBenefitPlanBenefitObligation


Defined
Period End2020-12-312019-12-312018-12-312017-12-31
Value441143113591500
Percentage of DefinedBenefitPlanBenefitObligation100.0100.0100.0100.0

us-gaap:DefinedBenefitPlanBenefitObligation us-gaap:RetirementPlanType

awi:RetireeHealthAndLifeInsuranceBenefits


Defined
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-31
Value8177658693190
Percentage of DefinedBenefitPlanBenefitObligation18.45.44.85.80.00.0

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter

awi:RetireeHealthAndLifeInsuranceBenefits


Defined
Period End2020-12-312019-12-312018-12-312017-12-31
Value23242128
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter100.0100.0100.0100.0

awi:USDefinedBenefitPlans


Defined
Period End2020-12-312019-12-312018-12-312017-12-31
Value114450472482
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter483.11862.42228.31675.7

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths

awi:RetireeHealthAndLifeInsuranceBenefits


Defined
Period End2020-12-312019-12-312018-12-312017-12-31
Value6.56.56.67.4
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths100.0100.0100.0100.0

awi:USDefinedBenefitPlans


Defined
Period End2020-12-312019-12-312018-12-312017-12-31
Value12103106106
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths184.61593.81610.61437.8

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive

awi:RetireeHealthAndLifeInsuranceBenefits


Defined
Period End2020-12-312019-12-312018-12-312017-12-31
Value5.65.65.16.6
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive100.0100.0100.0100.0

awi:USDefinedBenefitPlans


Defined
Period End2020-12-312019-12-312018-12-312017-12-31
Value2097100101
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive360.71746.41978.41537.9

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour

awi:RetireeHealthAndLifeInsuranceBenefits


Defined
Period End2020-12-312019-12-312018-12-312017-12-31
Value5.85.85.56.9
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour100.0100.0100.0100.0

awi:USDefinedBenefitPlans


Defined
Period End2020-12-312019-12-312018-12-312017-12-31
Value1999102102
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour327.61713.81860.01484.1

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree

awi:RetireeHealthAndLifeInsuranceBenefits


Defined
Period End2020-12-312019-12-312018-12-312017-12-31
Value6.26.25.87.1
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree100.0100.0100.0100.0

awi:USDefinedBenefitPlans


Defined
Period End2020-12-312019-12-312018-12-312017-12-31
Value17100103104
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree274.21621.01777.61470.4

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo

awi:RetireeHealthAndLifeInsuranceBenefits


Defined
Period End2020-12-312019-12-312018-12-312017-12-31
Value6.46.36.27.4
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo100.0100.0100.0100.0

awi:USDefinedBenefitPlans


Defined
Period End2020-12-312019-12-312018-12-312017-12-31
Value15101105105
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo234.41611.11696.81423.0

us-gaap:DefinedBenefitPlanFairValueOfPlanAssets

us-gaap:DefinedBenefitPlanFairValueOfPlanAssets


Defined
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value5201478136015291512
Percentage of DefinedBenefitPlanFairValueOfPlanAssets100.0100.0100.0100.0100.0

us-gaap:DefinedBenefitPlanFundedStatusOfPlan

us-gaap:DefinedBenefitPlanFundedStatusOfPlan


Defined
Period End2020-12-312019-12-312018-12-31
Value79470.7
Percentage of DefinedBenefitPlanFundedStatusOfPlan100.0100.0100.0

us-gaap:DefinedBenefitPlanFundedStatusOfPlan us-gaap:RetirementPlanType

awi:RetireeHealthAndLifeInsuranceBenefits


Defined
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value-81.4-77.5-65.4-86.6-93.1
Percentage of DefinedBenefitPlanFundedStatusOfPlan-103.0-164.9-9342.90.00.0

us-gaap:DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateAccumulatedBenefitObligation us-gaap:RetirementPlanName

us-gaap:DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateAccumulatedBenefitObligation

awi:RetirementBenefitEquityPlan


Defined
Period End2020-12-312019-12-312018-12-31
Value404752
Percentage of DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateAccumulatedBenefitObligation100.0100.0100.0

us-gaap:DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateProjectedBenefitObligation us-gaap:RetirementPlanName

us-gaap:DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateProjectedBenefitObligation

awi:RetirementBenefitEquityPlan


Defined
Period End2020-12-312019-12-312018-12-31
Value404752
Percentage of DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateProjectedBenefitObligation100.0100.0100.0

us-gaap:DefinedBenefitPlanPlanAssetsTargetAllocationPercentage us-gaap:InvestmentType

us-gaap:DefinedBenefitPlanPlanAssetsTargetAllocationPercentage

awi:EquitiesRealEstateAndPrivateEquity


Defined
Period End2020-12-312019-12-31
Value10.00.3
Percentage of DefinedBenefitPlanPlanAssetsTargetAllocationPercentage100.0100.0

awi:LongDurationBond


Defined
Period End2020-12-312019-12-312018-12-31
Value90.00.70.59
Percentage of DefinedBenefitPlanPlanAssetsTargetAllocationPercentage900.0233.30.0

us-gaap:DefinedBenefitPlanUltimateHealthCareCostTrendRate1 us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanUltimateHealthCareCostTrendRate1

awi:RetireeHealthAndLifeInsuranceBenefits


Defined
Period End2020-12-31
Value4.5
Percentage of DefinedBenefitPlanUltimateHealthCareCostTrendRate1100.0

us-gaap:DefinedBenefitPlanWeightedAverageAssetAllocations us-gaap:InvestmentType

us-gaap:DefinedBenefitPlanWeightedAverageAssetAllocations

awi:EquitiesRealEstateAndPrivateEquity


Defined
Period End2020-12-312019-12-312018-12-31
Value11.00.30.3
Percentage of DefinedBenefitPlanWeightedAverageAssetAllocations100.0100.0100.0

awi:LongDurationBond


Defined
Period End2020-12-312019-12-312018-12-312017-12-31
Value89.00.690.620.59
Percentage of DefinedBenefitPlanWeightedAverageAssetAllocations809.1230.0206.70.0

us-gaap:DerivativeAssetsLiabilitiesAtFairValueNet us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:DerivativeAssetsLiabilitiesAtFairValueNet

us-gaap:InterestRateSwap, us-gaap:FairValueInputsLevel2


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302019-12-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302015-12-31
Value-22.5-24.2-28.9-30.6-14.33.51413128.96.76.88.46.9-4.2-10.6
Percentage of DerivativeAssetsLiabilitiesAtFairValueNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DerivativeAssetsLiabilitiesAtFairValueNet us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByMeasurementBasis

us-gaap:InterestRateSwap, us-gaap:CarryingReportedAmountFairValueDisclosure


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302019-12-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302015-12-31
Value-22.5-24.2-28.9-30.6-14.33.51413128.96.76.88.46.9-4.2-10.6
Percentage of DerivativeAssetsLiabilitiesAtFairValueNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InterestRateSwap, us-gaap:EstimateOfFairValueFairValueDisclosure


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302019-12-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302015-12-31
Value-22.5-24.2-28.9-30.6-14.33.51413128.96.76.88.46.9-4.2-10.6
Percentage of DerivativeAssetsLiabilitiesAtFairValueNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DerivativeLiabilities us-gaap:BalanceSheetLocation, us-gaap:DerivativeInstrumentRisk

us-gaap:DerivativeLiabilities

us-gaap:AccountsPayableAndAccruedLiabilities, us-gaap:InterestRateSwap


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-31
Value0.20.20.50.91.41.5
Percentage of DerivativeLiabilities100.0100.0100.0100.0100.0100.0

us-gaap:OtherNoncurrentLiabilities, us-gaap:InterestRateSwap


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302014-12-312013-12-312012-12-31
Value22242829302815181510.06.10.54.27.63.01014111225
Percentage of DerivativeLiabilities11150.012000.05680.03300.02207.11913.30.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:DerivativeLiabilitiesNoncurrent

us-gaap:DerivativeLiabilitiesNoncurrent


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-312016-12-312016-09-302016-06-302016-03-312015-12-312014-12-312014-09-302013-12-312013-09-302012-12-312011-12-31
Value22242829302815181510.06.10.20.54.27.63.010119.512142516
Percentage of DerivativeLiabilitiesNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EmployeeRelatedLiabilitiesCurrent

us-gaap:EmployeeRelatedLiabilitiesCurrent


Employee
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-312014-12-312013-12-312013-09-302012-12-312011-12-31
Value191217107.14.41612106.61814149.818262320332520623389798191
Percentage of EmployeeRelatedLiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized

us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized


Employee
Period End2020-12-31
Value17
Percentage of EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized100.0

us-gaap:EquityMethodInvestmentDifferenceBetweenCarryingAmountAndUnderlyingEquity us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

us-gaap:EquityMethodInvestmentDifferenceBetweenCarryingAmountAndUnderlyingEquity

awi:WorthingtonArmstrongVenture


Equity
Period End2020-12-312019-12-312019-09-302018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value141145147155161166172177183188194
Percentage of EquityMethodInvestmentDifferenceBetweenCarryingAmountAndUnderlyingEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EquityMethodInvestmentDifferenceBetweenCarryingAmountAndUnderlyingEquity us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, us-gaap:FairValueByAssetClass

awi:WorthingtonArmstrongVenture, awi:OtherIntangibles


Equity
Period End2020-12-312019-12-312019-09-302018-12-312017-12-31
Value110115116124130
Percentage of EquityMethodInvestmentDifferenceBetweenCarryingAmountAndUnderlyingEquity78.278.979.080.280.9

us-gaap:EquityMethodInvestmentOwnershipPercentage us-gaap:RelatedPartyTransactionsByRelatedParty

us-gaap:EquityMethodInvestmentOwnershipPercentage

awi:WorthingtonArmstrongVenture


Equity
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-31
Value50.00.50.50.50.50.50.50.50.5
Percentage of EquityMethodInvestmentOwnershipPercentage100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EquityMethodInvestmentOwnershipPercentage us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

awi:WorthingtonArmstrongVenture


Equity
Period End2021-06-302021-03-312020-12-312020-09-302020-03-312019-12-312019-09-302019-06-302018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-31
Value50.050.050.050.00.50.50.50.50.50.50.50.50.50.50.5
Percentage of EquityMethodInvestmentOwnershipPercentage0.00.0100.00.00.0100.00.00.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue


Fair
Period End2021-06-302021-03-312020-12-31
Value7.41716
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue100.0100.0100.0

us-gaap:FinanceLeaseLiability

us-gaap:FinanceLeaseLiability


Finance
Period End2020-12-312020-09-302019-12-312019-09-302019-06-30
Value20200.00.00.0
Percentage of FinanceLeaseLiability100.0100.00.00.00.0

us-gaap:FinanceLeaseLiabilityCurrent

us-gaap:FinanceLeaseLiabilityCurrent


Finance
Period End2021-06-302021-03-312020-12-312020-09-30
Value2100000.02000000.02000000.01800000.0
Percentage of FinanceLeaseLiabilityCurrent100.0100.0100.0100.0

us-gaap:FinanceLeaseLiabilityNoncurrent

us-gaap:FinanceLeaseLiabilityNoncurrent


Finance
Period End2021-06-302021-03-312020-12-312020-09-30
Value17181818
Percentage of FinanceLeaseLiabilityNoncurrent100.0100.0100.0100.0

us-gaap:FinanceLeaseLiabilityPaymentsDue

us-gaap:FinanceLeaseLiabilityPaymentsDue


Finance
Period End2020-12-312020-09-30
Value2525
Percentage of FinanceLeaseLiabilityPaymentsDue100.0100.0

us-gaap:FinanceLeaseLiabilityPaymentsDueNextTwelveMonths

us-gaap:FinanceLeaseLiabilityPaymentsDueNextTwelveMonths


Finance
Period End2020-12-312020-09-30
Value2700000.02600000.0
Percentage of FinanceLeaseLiabilityPaymentsDueNextTwelveMonths100.0100.0

us-gaap:FinanceLeaseLiabilityPaymentsDueYearFive

us-gaap:FinanceLeaseLiabilityPaymentsDueYearFive


Finance
Period End2020-12-31
Value2400000.0
Percentage of FinanceLeaseLiabilityPaymentsDueYearFive100.0

us-gaap:FinanceLeaseLiabilityPaymentsDueYearFour

us-gaap:FinanceLeaseLiabilityPaymentsDueYearFour


Finance
Period End2020-12-312020-09-30
Value2500000.02400000.0
Percentage of FinanceLeaseLiabilityPaymentsDueYearFour100.0100.0

us-gaap:FinanceLeaseLiabilityPaymentsDueYearThree

us-gaap:FinanceLeaseLiabilityPaymentsDueYearThree


Finance
Period End2020-12-312020-09-30
Value2700000.02500000.0
Percentage of FinanceLeaseLiabilityPaymentsDueYearThree100.0100.0

us-gaap:FinanceLeaseLiabilityPaymentsDueYearTwo

us-gaap:FinanceLeaseLiabilityPaymentsDueYearTwo


Finance
Period End2020-12-312020-09-30
Value2800000.02600000.0
Percentage of FinanceLeaseLiabilityPaymentsDueYearTwo100.0100.0

us-gaap:FinanceLeaseLiabilityPaymentsRemainderOfFiscalYear

us-gaap:FinanceLeaseLiabilityPaymentsRemainderOfFiscalYear


Finance
Period End2020-09-30
Value600000.0
Percentage of FinanceLeaseLiabilityPaymentsRemainderOfFiscalYear100.0

us-gaap:FinanceLeaseLiabilityUndiscountedExcessAmount

us-gaap:FinanceLeaseLiabilityUndiscountedExcessAmount


Finance
Period End2020-12-312020-09-30
Value4800000.04900000.0
Percentage of FinanceLeaseLiabilityUndiscountedExcessAmount100.0100.0

us-gaap:FinanceLeaseRightOfUseAsset

us-gaap:FinanceLeaseRightOfUseAsset


Finance
Period End2021-06-302021-03-312020-12-312020-09-30
Value19192020
Percentage of FinanceLeaseRightOfUseAsset100.0100.0100.0100.0

us-gaap:FinanceLeaseWeightedAverageDiscountRatePercent

us-gaap:FinanceLeaseWeightedAverageDiscountRatePercent


Finance
Period End2020-12-312020-09-30
Value3.63.7
Percentage of FinanceLeaseWeightedAverageDiscountRatePercent100.0100.0

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
Value22821820820319619218718418017417016616315915515314914614213813513413012612311911511210810510197949087838174
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

awi:TrademarksAndBrandNames


Finite
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value1.61.51.31.10.90.80.60.50.30.10.2
Percentage of FiniteLivedIntangibleAssetsAccumulatedAmortization0.70.70.60.50.50.40.30.30.20.10.1

us-gaap:ComputerSoftwareIntangibleAsset


Finite
Period End2021-06-302021-03-31
Value0.70.3
Percentage of FiniteLivedIntangibleAssetsAccumulatedAmortization0.30.1

us-gaap:CustomerRelationships


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
Value1391341281241201171141111081051031009896939189878482807876747270686664626058565351494944
Percentage of FiniteLivedIntangibleAssetsAccumulatedAmortization60.861.261.861.561.461.361.260.660.360.360.360.360.360.260.259.959.759.759.759.759.758.858.858.858.959.059.059.059.259.259.359.359.459.559.759.760.460.5

us-gaap:DevelopedTechnologyRights


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
Value8179777675737270696766656362605958565554525251494846454342403938363533323128
Percentage of FiniteLivedIntangibleAssetsAccumulatedAmortization35.436.337.337.638.138.238.438.338.438.838.939.039.039.039.138.938.938.938.938.938.839.139.139.139.039.038.939.038.938.938.838.838.938.938.938.738.138.2

us-gaap:NoncompeteAgreements


Finite
Period End2021-06-302021-03-312020-12-312020-09-30
Value0.90.60.40.2
Percentage of FiniteLivedIntangibleAssetsAccumulatedAmortization0.40.30.20.1

us-gaap:OtherIntangibleAssets


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
Value5.53.10.20.50.10.10.11.42.11.41.21.11.11.21.11.82.22.12.02.02.02.82.72.72.62.42.42.22.12.01.91.81.61.51.31.31.21.0
Percentage of FiniteLivedIntangibleAssetsAccumulatedAmortization2.41.40.10.20.10.10.10.81.20.80.70.70.70.80.71.21.51.41.41.41.52.12.12.12.12.02.12.01.91.91.91.81.71.71.51.61.51.3

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths


Finite
Period End2020-12-31
Value34
Percentage of FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths100.0

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearFive

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearFive


Finite
Period End2020-12-31
Value12
Percentage of FiniteLivedIntangibleAssetsAmortizationExpenseYearFive100.0

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearFour

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearFour


Finite
Period End2020-12-31
Value13
Percentage of FiniteLivedIntangibleAssetsAmortizationExpenseYearFour100.0

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearThree

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearThree


Finite
Period End2020-12-31
Value13
Percentage of FiniteLivedIntangibleAssetsAmortizationExpenseYearThree100.0

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo


Finite
Period End2020-12-31
Value16
Percentage of FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo100.0

us-gaap:FiniteLivedIntangibleAssetsGross

us-gaap:FiniteLivedIntangibleAssetsGross


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
Value318318319298278277278279285285272272270266265273273273261261262273273273273272271271270270270269268268262262266266
Percentage of FiniteLivedIntangibleAssetsGross100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FiniteLivedIntangibleAssetsGross us-gaap:FiniteLivedIntangibleAssetsByMajorClass

awi:TrademarksAndBrandNames


Finite
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value4.04.04.03.93.83.83.93.93.93.91.11.1
Percentage of FiniteLivedIntangibleAssetsGross1.31.31.31.31.41.41.41.41.41.40.40.4

us-gaap:CustomerRelationships


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
Value201200200198188188188188188188181181180176176176176176165165165165165165165165165165165165165165165165165166170170
Percentage of FiniteLivedIntangibleAssetsGross63.263.162.966.467.967.967.967.566.266.266.666.766.866.266.364.664.664.763.363.263.160.660.660.660.560.760.961.161.161.361.361.461.661.763.163.364.164.1

us-gaap:DevelopedTechnologyRights


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
Value9292929185858584848484848483838383838282828787868686848483838382828281818181
Percentage of FiniteLivedIntangibleAssetsGross29.129.028.930.630.730.630.630.329.729.730.930.931.131.531.530.530.430.431.731.631.532.031.931.831.731.631.331.030.830.930.830.630.630.631.231.030.430.4

us-gaap:NoncompeteAgreements


Finite
Period End2021-06-302021-03-312020-12-312020-09-302019-12-31
Value5.65.66.33.50.2
Percentage of FiniteLivedIntangibleAssetsGross1.81.82.01.20.1

us-gaap:OtherIntangibleAssets


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
Value5.96.56.91.50.30.30.32.17.77.85.65.55.86.15.91313131313142020202121212121212121212015151414
Percentage of FiniteLivedIntangibleAssetsGross1.92.02.20.50.10.10.10.82.72.72.12.02.12.32.24.95.04.95.15.35.37.47.57.67.87.77.87.98.07.98.08.07.87.85.75.75.55.5

us-gaap:IncomeTaxesReceivable

us-gaap:IncomeTaxesReceivable


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value2.11.82.35.3101730264.40.71.710.05.924307.47.610.0264.94.66.5115.810145.3118.41217158.7141615232323222420
Percentage of IncomeTaxesReceivable100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncomeTaxesReceivableNoncurrent

us-gaap:IncomeTaxesReceivableNoncurrent


Income
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value600000.0600000.02500000.02500000.02500000.0800000.0800000.0800000.0800000.04100000.04100000.04100000.04100000.07400000.06500000.05700000.04900000.04100000.03300000.02400000.0
Percentage of IncomeTaxesReceivableNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseInUnrecognizedTaxBenefitsIsReasonablyPossible us-gaap:IncomeTaxAuthority

us-gaap:IncreaseInUnrecognizedTaxBenefitsIsReasonablyPossible

us-gaap:DomesticCountry


Increase
Period End2020-12-31
Value1500000.0
Percentage of IncreaseInUnrecognizedTaxBenefitsIsReasonablyPossible100.0

us-gaap:IntangibleAssetsGrossExcludingGoodwill

us-gaap:IntangibleAssetsGrossExcludingGoodwill


Intangible
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312018-12-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302012-12-31
Value663663666631599599599593575576576620620620620619617626625624624623614
Percentage of IntangibleAssetsGrossExcludingGoodwill100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InventoryWorkInProcess

us-gaap:InventoryWorkInProcess


Inventory
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302011-12-31
Value6.15.65.54.64.24.54.05.45.24.94.45.54.13.12.74.04.34.43.33.13.52425262626233235342931302127302825
Percentage of InventoryWorkInProcess100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InvestmentsFairValueDisclosure

us-gaap:InvestmentsFairValueDisclosure


Investments
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value5121467129614661436
Percentage of InvestmentsFairValueDisclosure100.0100.0100.0100.0100.0

us-gaap:InvestmentsFairValueDisclosure us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:FairValueInputsLevel1


Investments
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value-0.30.3-22.71.7363
Percentage of InvestmentsFairValueDisclosure-0.10.0-1.80.125.3

us-gaap:FairValueInputsLevel2


Investments
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value5131464131614611070
Percentage of InvestmentsFairValueDisclosure100.199.8101.699.774.5

us-gaap:InvestmentsFairValueDisclosure us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:InvestmentType

us-gaap:FairValueInputsLevel1, us-gaap:CashAndCashEquivalents


Investments
Period End2020-12-312019-12-312018-12-312017-12-31
Value-0.30.3-22.71.7
Percentage of InvestmentsFairValueDisclosure-0.10.0-1.80.1

us-gaap:FairValueInputsLevel2, awi:CollectiveTrustFunds


Investments
Period End2020-12-312019-12-312018-12-312017-12-31
Value51434460561
Percentage of InvestmentsFairValueDisclosure10.029.635.538.3

us-gaap:FairValueInputsLevel2, us-gaap:Bonds


Investments
Period End2020-12-312019-12-312018-12-312017-12-31
Value4601017832879
Percentage of InvestmentsFairValueDisclosure89.969.364.260.0

us-gaap:FairValueInputsLevel2, us-gaap:CashAndCashEquivalents


Investments
Period End2020-12-312019-12-312018-12-312017-12-31
Value0.9122420
Percentage of InvestmentsFairValueDisclosure0.20.91.91.4

us-gaap:InvestmentsFairValueDisclosure us-gaap:InvestmentType

awi:CollectiveTrustFunds


Investments
Period End2020-12-312019-12-312018-12-312017-12-31
Value51434460561
Percentage of InvestmentsFairValueDisclosure10.029.635.538.3

us-gaap:Bonds


Investments
Period End2020-12-312019-12-312018-12-312017-12-31
Value4601017832879
Percentage of InvestmentsFairValueDisclosure89.969.364.260.0

us-gaap:CashAndCashEquivalents


Investments
Period End2020-12-312019-12-312018-12-312017-12-31
Value0.6121.522
Percentage of InvestmentsFairValueDisclosure0.10.90.11.5

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths


Lessee
Period End2020-12-312020-09-30
Value5500000.04900000.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths100.0100.0

us-gaap:LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear

us-gaap:LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear


Lessee
Period End2020-09-30
Value1300000.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear100.0

us-gaap:LettersOfCreditOutstandingAmount us-gaap:DebtInstrument, us-gaap:ShortTermDebtType

us-gaap:LettersOfCreditOutstandingAmount

awi:BiLateralFacility, us-gaap:LetterOfCredit


Letters
Period End2021-06-30
Value8.4
Percentage of LettersOfCreditOutstandingAmount100.0

us-gaap:LettersOfCreditOutstandingAmount us-gaap:ShortTermDebtType

us-gaap:LetterOfCredit


Letters
Period End2021-06-30
Value8.4
Percentage of LettersOfCreditOutstandingAmount100.0

us-gaap:LineOfCredit us-gaap:CreditFacility

us-gaap:LineOfCredit

us-gaap:RevolvingCreditFacility


Line
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302016-12-312014-09-302013-12-31
Value2002252251851301951151200.00.00.00.00.00.00.00.00.00.00.0
Percentage of LineOfCredit100.0100.0100.0100.0100.0100.0100.0100.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:LineOfCredit us-gaap:DebtInstrument

awi:TermLoan


Line
Period End2021-06-302021-03-312020-12-31
Value481487493
Percentage of LineOfCredit240.7216.6219.4

us-gaap:LineOfCreditFacilityCurrentBorrowingCapacity us-gaap:DebtInstrument, us-gaap:ShortTermDebtType

us-gaap:LineOfCreditFacilityCurrentBorrowingCapacity

awi:BiLateralFacility, us-gaap:LetterOfCredit


Line
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value1010101010111111131313131717171919
Percentage of LineOfCreditFacilityCurrentBorrowingCapacity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LineOfCreditFacilityCurrentBorrowingCapacity us-gaap:LongtermDebtType

us-gaap:SeniorNotes


Line
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value100010001000100010001000100010501050105010501050105010501050105010501050105010501050
Percentage of LineOfCreditFacilityCurrentBorrowingCapacity0.09708.79174.39174.39174.39174.38771.99130.49210.57835.87835.87835.87835.86140.46140.46140.45468.85468.80.00.00.0

us-gaap:LineOfCreditFacilityCurrentBorrowingCapacity us-gaap:ShortTermDebtType

us-gaap:LetterOfCredit


Line
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value1010101010114747494949495253535555
Percentage of LineOfCreditFacilityCurrentBorrowingCapacity100.0100.0100.0100.0100.0100.0414.8417.5370.1370.1370.1370.1306.4311.7311.7288.5288.5

us-gaap:LineOfCreditFacilityRemainingBorrowingCapacity us-gaap:DebtInstrument, us-gaap:ShortTermDebtType

us-gaap:LineOfCreditFacilityRemainingBorrowingCapacity

awi:BiLateralFacility, us-gaap:LetterOfCredit


Line
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value161414141414131313111111117.97.97.95.85.8
Percentage of LineOfCreditFacilityRemainingBorrowingCapacity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LineOfCreditFacilityRemainingBorrowingCapacity us-gaap:ShortTermDebtType

us-gaap:LetterOfCredit


Line
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value166164164164164164199161163157155158165162151155159153
Percentage of LineOfCreditFacilityRemainingBorrowingCapacity1003.61120.41163.81163.81163.81163.81469.11192.61202.91356.01341.41365.51425.92058.21915.21969.62755.22637.9

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths


Long
Period End2020-12-31
Value25
Percentage of LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths100.0

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour


Long
Period End2020-12-31
Value643
Percentage of LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour100.0

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree


Long
Period End2020-12-31
Value25
Percentage of LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree100.0

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo


Long
Period End2020-12-31
Value25
Percentage of LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo100.0

us-gaap:LossContingencyAccrualAtCarryingValue dei:LegalEntity, us-gaap:StatementScenario

us-gaap:LossContingencyAccrualAtCarryingValue

awi:Knauf, srt:ScenarioForecast


Loss
Period End2020-12-31
Value11
Percentage of LossContingencyAccrualAtCarryingValue100.0

us-gaap:OperatingLeaseWeightedAverageDiscountRatePercent

us-gaap:OperatingLeaseWeightedAverageDiscountRatePercent


Operating
Period End2020-12-312020-09-302020-06-302020-03-312019-12-31
Value4.04.10.0440.0440.044
Percentage of OperatingLeaseWeightedAverageDiscountRatePercent100.0100.0100.0100.0100.0

us-gaap:OperatingLossCarryforwards us-gaap:IncomeTaxAuthority

us-gaap:OperatingLossCarryforwards

us-gaap:StateAndLocalJurisdiction


Operating
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-31
Value80689795466476086396910671145
Percentage of OperatingLossCarryforwards100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherAccruedLiabilitiesNoncurrent

us-gaap:OtherAccruedLiabilitiesNoncurrent


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-312016-12-312016-09-302016-06-302016-03-312015-12-312014-12-312014-09-302013-12-31
Value9.91011129.77.26.77.06.66.26.26.57.68.13.95.76.56.76.77.2
Percentage of OtherAccruedLiabilitiesNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherAssetsMiscellaneousCurrent

us-gaap:OtherAssetsMiscellaneousCurrent


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302011-12-31
Value2.21.60.81.60.90.81.41.11.00.90.70.61.81.51.63.02.73.4231310117.75.55.64.99.63.63.85.46.11.27.87.32.3
Percentage of OtherAssetsMiscellaneousCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherAssetsMiscellaneousNoncurrent

us-gaap:OtherAssetsMiscellaneousNoncurrent


Other
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302018-12-312017-12-312016-12-312016-09-302016-06-302015-12-312014-12-312013-12-312013-09-302012-12-312011-12-31
Value0.36.62.52.03.12.93.24.61.74.65.66.75.37.512121010
Percentage of OtherAssetsMiscellaneousNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherPostretirementDefinedBenefitPlanLiabilitiesCurrentAndNoncurrent us-gaap:RetirementPlanType

us-gaap:OtherPostretirementDefinedBenefitPlanLiabilitiesCurrentAndNoncurrent

awi:RetireeHealthAndLifeInsuranceBenefits


Other
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value7471587984
Percentage of OtherPostretirementDefinedBenefitPlanLiabilitiesCurrentAndNoncurrent100.0100.0100.0100.0100.0

us-gaap:OtherPostretirementDefinedBenefitPlanLiabilitiesNoncurrent

us-gaap:OtherPostretirementDefinedBenefitPlanLiabilitiesNoncurrent


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value717374676869715456575874767779808283849188171172194198200201228231233234240242245248263265267272273276277
Percentage of OtherPostretirementDefinedBenefitPlanLiabilitiesNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherReceivablesGrossCurrent

us-gaap:OtherReceivablesGrossCurrent


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302011-12-31
Value1.52.94.010338.75.05.82.33.1118.43.629169.96.06.05.95.07.28.26.98.38.89.37.88.27.35.97.76.37.37.6107.07.9
Percentage of OtherReceivablesGrossCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PercentageOfLIFOInventory

us-gaap:PercentageOfLIFOInventory


Percentage
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value69.00.730.760.840.380.770.730.620.630.66
Percentage of PercentageOfLIFOInventory100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PostemploymentBenefitsLiabilityCurrent

us-gaap:PostemploymentBenefitsLiabilityCurrent


Postemployment
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-312014-12-312013-12-31
Value9.69.69.5101010101111111011111111131312121414222428
Percentage of PostemploymentBenefitsLiabilityCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PrepaidExpenseCurrent

us-gaap:PrepaidExpenseCurrent


Prepaid
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302011-12-31
Value13131210108.07.56.55.77.34.17.12115161513153941424442474949494645423939253027
Percentage of PrepaidExpenseCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RelatedPartyTransactionDueFromToRelatedParty us-gaap:RelatedPartyTransactionsByRelatedParty

us-gaap:RelatedPartyTransactionDueFromToRelatedParty

awi:WorthingtonArmstrongVenture


Related
Period End2020-12-312019-12-31
Value4900000.03300000.0
Percentage of RelatedPartyTransactionDueFromToRelatedParty100.0100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber us-gaap:AwardType

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber

us-gaap:PhantomShareUnitsPSUs


Share
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-31
Value330300.0357700.0503200.0379700.0290400.0216900.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber100.0100.0100.0100.0100.0100.0

us-gaap:RestrictedStockUnitsRSU


Share
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-31
Value66800.065400.0100300.0171600.0224500.0413300.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber20.218.319.945.277.3190.5

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue us-gaap:AwardType

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue

us-gaap:PhantomShareUnitsPSUs


Share
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-31
Value75.4958.2745.1441.0840.2952.84
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue100.0100.0100.0100.0100.0100.0

us-gaap:RestrictedStockUnitsRSU


Share
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-31
Value83.1466.4948.6945.2744.9454.66
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue110.1114.1107.9110.2111.5103.4

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue


Share
Period End2020-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value4.51018484731
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue100.0100.0100.0100.0100.0100.0

us-gaap:StockRepurchaseProgramAuthorizedAmount1 us-gaap:Range, us-gaap:StatementEquityComponents, us-gaap:SubsequentEventType

us-gaap:StockRepurchaseProgramAuthorizedAmount1

srt:Maximum, us-gaap:CommonStock, us-gaap:SubsequentEvent


Stock
Period End2020-07-27
Value1200
Percentage of StockRepurchaseProgramAuthorizedAmount1100.0

us-gaap:TaxCreditCarryforwardAmount us-gaap:TaxCreditCarryforward

us-gaap:TaxCreditCarryforwardAmount

us-gaap:CapitalLossCarryforward


Tax
Period End2020-12-312019-12-31
Value1916
Percentage of TaxCreditCarryforwardAmount100.0100.0

us-gaap:TreasuryStockCommonValue

us-gaap:TreasuryStockCommonValue


Treasury
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302018-12-31
Value893873863857857857823773692
Percentage of TreasuryStockCommonValue100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued

us-gaap:UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued


Unrecognized
Period End2020-12-31
Value2900000.0
Percentage of UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued100.0

us-gaap:UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate

us-gaap:UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate


Unrecognized
Period End2020-12-31
Value18
Percentage of UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate100.0

us-gaap:ValuationAllowancesAndReservesBalance us-gaap:ValuationAllowancesAndReservesType

us-gaap:ValuationAllowancesAndReservesBalance

awi:ReserveForCashDiscounts


Valuation
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-31
Value1.31.41.31.51.30.8
Percentage of ValuationAllowancesAndReservesBalance100.0100.0100.0100.0100.0100.0

us-gaap:AllowanceForCreditLoss


Valuation
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-31
Value1.40.70.30.30.41.1
Percentage of ValuationAllowancesAndReservesBalance107.750.023.120.030.8137.5

us-gaap:WarrantyReserves


Valuation
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-31
Value0.90.20.40.10.67.77.97.48.7
Percentage of ValuationAllowancesAndReservesBalance69.214.330.86.746.2962.50.00.00.0

us-gaap:WeightedAverageCostInventoryAmount

us-gaap:WeightedAverageCostInventoryAmount


Weighted
Period End2020-12-312019-12-31
Value2518
Percentage of WeightedAverageCostInventoryAmount100.0100.0

us-gaap:WeightedAverageCostInventoryAmount us-gaap:StatementBusinessSegments

awi:CanadaLocations


Weighted
Period End2020-12-312019-12-31
Value3.03.2
Percentage of WeightedAverageCostInventoryAmount11.817.3

awi:UnitedStatesLocations


Weighted
Period End2020-12-312019-12-31
Value2215
Percentage of WeightedAverageCostInventoryAmount88.282.7

Line plots across dimensions of each concept


Operating Margin
us-gaap:StatementBusinessSegments
(None,)
Operating  Marginus-gaap: Statement Business Segments
TTM Greenblatt ROC
_
(None,)
T T M  Greenblatt  R O C_
us-gaap:OperatingIncomeLoss
us-gaap:StatementBusinessSegments
(None,)