KALU


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

Table of contents



us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic

us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount

us-gaap:EarningsPerShareBasic

us-gaap:EarningsPerShareDiluted

us-gaap:ComprehensiveIncomeNetOfTax

us-gaap:CostOfGoodsAndServicesSold
us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship

us-gaap:CostsAndExpenses

us-gaap:GainsLossesOnExtinguishmentOfDebt
us-gaap:DebtInstrument, us-gaap:LongtermDebtType

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments

us-gaap:IncomeTaxExpenseBenefit

us-gaap:IncomeTaxesPaid
us-gaap:StatementGeographical

us-gaap:InterestExpense
us-gaap:DebtInstrument, us-gaap:LongtermDebtType
us-gaap:InterestExpenseDebt
us-gaap:DebtInstrument, us-gaap:LongtermDebtType
us-gaap:InterestExpenseLongTermDebt

us-gaap:InterestPaidNet

us-gaap:NetIncomeLoss
us-gaap:StatementEquityComponents

us-gaap:NonoperatingIncomeExpense

us-gaap:OperatingIncomeLoss

us-gaap:OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax

us-gaap:OtherNonoperatingIncomeExpense
us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax
us-gaap:ProductOrService
us-gaap:TimingOfTransferOfGoodOrService

us-gaap:Revenues
us-gaap:ProductOrService
us-gaap:TimingOfTransferOfGoodOrService

us-gaap:Assets

us-gaap:Liabilities

us-gaap:LiabilitiesAndStockholdersEquity

us-gaap:StockholdersEquity
us-gaap:StatementEquityComponents

us-gaap:AssetsCurrent

us-gaap:Cash

us-gaap:CashAndCashEquivalentsAtCarryingValue

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents

us-gaap:AccountsReceivableNetCurrent

us-gaap:InventoryNet

us-gaap:InventoryFinishedGoods

us-gaap:InventoryLIFOReserve

us-gaap:PrepaidExpenseAndOtherAssetsCurrent

us-gaap:Land

us-gaap:MachineryAndEquipmentGross

us-gaap:NoncurrentAssets
us-gaap:StatementGeographical

us-gaap:PropertyPlantAndEquipmentGross

us-gaap:ConstructionInProgressGross

us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment

us-gaap:AmortizationOfIntangibleAssets

us-gaap:PropertyPlantAndEquipmentNet

us-gaap:Goodwill
us-gaap:BusinessAcquisition
us-gaap:Restatement, us-gaap:BusinessAcquisition

us-gaap:FiniteLivedIntangibleAssetsNet
us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:OperatingLeaseRightOfUseAsset

us-gaap:OtherAssetsNoncurrent

us-gaap:AccountsPayableCurrent

us-gaap:LiabilitiesCurrent

us-gaap:OperatingLeaseLiabilityCurrent

us-gaap:OtherAccruedLiabilitiesCurrent

us-gaap:TaxesPayableCurrent

us-gaap:LongTermDebtNoncurrent

us-gaap:DeferredIncomeTaxLiabilitiesNet

us-gaap:PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent

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:TreasuryStockValue

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
us-gaap:StatementEquityComponents

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect

us-gaap:DepreciationDepletionAndAmortization
us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship

us-gaap:IncreaseDecreaseInInventories

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetIncomeLoss
us-gaap:StatementEquityComponents

us-gaap:ShareBasedCompensation

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:PaymentsToAcquireProductiveAssets

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:PaymentsOfDividends
us-gaap:SubsequentEventType
us-gaap:Dividends

us-gaap:PaymentsForRepurchaseOfCommonStock

us-gaap:EffectiveIncomeTaxRateContinuingOperations

us-gaap:DeferredTaxLiabilities

us-gaap:DeferredTaxAssetsNet

us-gaap:UnrecognizedTaxBenefits

us-gaap:DeferredTaxAssetsValuationAllowance
us-gaap:BusinessAcquisition
kalu:BusinessCombinationEstimateOfPostCloseAdjustments
us-gaap:BusinessAcquisition
kalu:BusinessCombinationOtherPostRetirementBenefitsLiabilities
us-gaap:RetirementPlanType
kalu:DefinedBenefitPlanNetPeriodicBenefitCostAndChargesRelatingToOtherBenefitPlans

kalu:DefinedBenefitPlanNetPeriodicCostBenefitVEBA

kalu:EffectiveIncomeTaxRateReconciliationPermanentItemsNondeductibleForTaxPurpose

kalu:EffectiveTaxRateReconciliationChangeInForecastedEarningsAmount

kalu:EffectiveTaxRateReconciliationChangeInForecastedEarningsPercent

kalu:EffectiveTaxRateReconciliationForeignWithholdingTax
us-gaap:BusinessAcquisition
kalu:FuturePaymentsToAcquireBusiness

kalu:IncreaseDecreaseInNoncurrentAssetsAndLiabilitiesNet

kalu:OtherNonoperatingIncomeExpenseNet
us-gaap:SubsequentEventType
kalu:QuarterlyDividendIncreasePercentage
us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:HedgingDesignation, us-gaap:IncomeStatementLocation
kalu:ReclassificationFromAOCIDueToCancellationOfFirmCommitment
us-gaap:StatementEquityComponents
us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:HedgingDesignation, us-gaap:IncomeStatementLocation
kalu:ReclassificationFromAOCIDueToForecastedSalesNoLongerProbableOfOccurring
us-gaap:StatementEquityComponents

kalu:RestructuringBenefit

kalu:RestructuringBenefitCosts

kalu:SellingAdministrativeResearchAndDevelopmentAndGeneralExpenses

us-gaap:AccountsReceivableSale

us-gaap:AccrualForEnvironmentalLossContingenciesPeriodIncreaseDecrease

us-gaap:AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation
us-gaap:StatementEquityComponents

us-gaap:AmortizationOfFinancingCostsAndDiscounts

us-gaap:AssetImpairmentCharges

us-gaap:BusinessAcquisitionsProFormaNetIncomeLoss

us-gaap:BusinessAcquisitionsProFormaRevenue
us-gaap:BusinessAcquisition
us-gaap:BusinessCombinationAcquisitionRelatedCosts
us-gaap:BusinessAcquisition, us-gaap:IncomeStatementLocation
us-gaap:BusinessAcquisition
us-gaap:BusinessCombinationConsiderationTransferred1

us-gaap:CapitalExpendituresIncurredButNotYetPaid

us-gaap:CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths
us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation, us-gaap:IncomeStatementLocation
us-gaap:ChangeInUnrealizedGainLossOnFairValueHedgingInstruments1
us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:HedgingDesignation, us-gaap:IncomeStatementLocation
us-gaap:ChangeInUnrealizedGainLossOnHedgedItemInFairValueHedge1
us-gaap:SubsequentEventType
us-gaap:CommonStockDividendsPerShareDeclared

us-gaap:ContractWithCustomerPerformanceObligationSatisfiedInPreviousPeriod
us-gaap:DebtInstrument, us-gaap:LongtermDebtType
us-gaap:DebtInstrumentRedemptionPricePercentageOfPrincipalAmountRedeemed

us-gaap:DebtSecuritiesAvailableForSaleRealizedGainLoss
us-gaap:RetirementPlanType
us-gaap:DeferredCompensationArrangementWithIndividualCompensationExpense

us-gaap:DeferredIncomeTaxesAndTaxCredits
us-gaap:RetirementPlanName, us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAmortizationOfGainsLosses
us-gaap:RetirementPlanName, us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAmortizationOfPriorServiceCostCredit
us-gaap:RetirementPlanName, us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanExpectedReturnOnPlanAssets
us-gaap:StatementEquityComponents
us-gaap:DefinedBenefitPlanForeignCurrencyExchangeRateChangesBenefitObligation
us-gaap:RetirementPlanName, us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanInterestCost

us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost
us-gaap:RetirementPlanName, us-gaap:RetirementPlanType
us-gaap:RetirementPlanName, us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanServiceCost
us-gaap:RetirementPlanType
us-gaap:DefinedContributionPlanCostRecognized

us-gaap:Depreciation
us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:HedgingDesignation, us-gaap:IncomeStatementLocation
us-gaap:DerivativeFairValueHedgeIncludedInEffectivenessGainLoss
us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:HedgingDesignation
us-gaap:DerivativeGainLossOnDerivativeNet
us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:HedgingDesignation, us-gaap:IncomeStatementLocation
us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation, us-gaap:IncomeStatementLocation
us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:HedgingDesignation, us-gaap:IncomeStatementLocation
us-gaap:HedgingDesignation, us-gaap:IncomeStatementLocation
us-gaap:ProductOrService, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:HedgingDesignation, us-gaap:IncomeStatementLocation
us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation, us-gaap:IncomeStatementLocation
us-gaap:DerivativeGainOnDerivative
us-gaap:HedgingDesignation, us-gaap:IncomeStatementLocation
us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation, us-gaap:IncomeStatementLocation
us-gaap:DerivativeLossOnDerivative

us-gaap:DividendsCash
us-gaap:StatementEquityComponents

us-gaap:EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate

us-gaap:EffectiveIncomeTaxRateReconciliationNondeductibleExpense

us-gaap:EffectiveIncomeTaxRateReconciliationShareBasedCompensationExcessTaxBenefitAmount

us-gaap:EffectiveIncomeTaxRateReconciliationShareBasedCompensationExcessTaxBenefitPercent

us-gaap:EffectiveIncomeTaxRateReconciliationTaxContingenciesStateAndLocal

us-gaap:EffectiveIncomeTaxRateReconciliationTaxCreditsResearch

us-gaap:EquitySecuritiesFvNiGainLoss

us-gaap:FederalIncomeTaxExpenseBenefitContinuingOperations

us-gaap:FinanceLeaseInterestExpense

us-gaap:FinanceLeaseRightOfUseAssetAmortization

us-gaap:ForeignIncomeTaxExpenseBenefitContinuingOperations

us-gaap:GainLossOnSaleOfInvestments

us-gaap:GainLossOnSaleOfPropertyPlantEquipment

us-gaap:IncomeTaxReconciliationChangeInEnactedTaxRate

us-gaap:IncomeTaxReconciliationNondeductibleExpense

us-gaap:IncomeTaxReconciliationTaxContingenciesStateAndLocal

us-gaap:IncreaseDecreaseInAccountsAndOtherReceivables

us-gaap:IncreaseDecreaseInAccountsPayableTrade

us-gaap:IncreaseDecreaseInAccruedLiabilities

us-gaap:IncreaseDecreaseInContractWithCustomerAsset

us-gaap:IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets

us-gaap:InterestCostsCapitalized
us-gaap:DebtInstrument, us-gaap:LongtermDebtType
us-gaap:InterestExpenseBorrowings

us-gaap:InvestmentIncomeInterest

us-gaap:LeaseCost
us-gaap:RetirementPlanType
us-gaap:MultiemployerPlanEmployerContributionCost
us-gaap:StatementEquityComponents
us-gaap:OciBeforeReclassificationsBeforeTaxAttributableToParent
us-gaap:StatementEquityComponents
us-gaap:OciBeforeReclassificationsNetOfTaxAttributableToParent

us-gaap:OperatingLeaseCost

us-gaap:OperatingLeasePayments

us-gaap:OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax
us-gaap:StatementEquityComponents
us-gaap:OtherComprehensiveIncomeLossBeforeReclassificationsTax
us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:HedgingDesignation, us-gaap:IncomeStatementLocation
us-gaap:OtherComprehensiveIncomeLossDerivativeExcludedComponentIncreaseDecreaseAfterAdjustmentsBeforeTaxParent

us-gaap:OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax

us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
us-gaap:StatementEquityComponents

us-gaap:OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax

us-gaap:OtherNoncashIncomeExpense

us-gaap:OtherOperatingIncomeExpenseNet

us-gaap:OtherPostretirementBenefitsPayments
us-gaap:RetirementPlanName, us-gaap:RetirementPlanType
us-gaap:RestructuringPlan
us-gaap:PaymentsForRestructuring

us-gaap:PaymentsOfFinancingCosts

us-gaap:PaymentsRelatedToTaxWithholdingForShareBasedCompensation

us-gaap:PaymentsToAcquireAvailableForSaleSecuritiesDebt

us-gaap:PaymentsToAcquireBusinessesGross

us-gaap:ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities

us-gaap:ProceedsFromSaleOfPropertyPlantAndEquipment
us-gaap:StatementEquityComponents
us-gaap:ReclassificationFromAociCurrentPeriodBeforeTaxAttributableToParent
us-gaap:StatementEquityComponents
us-gaap:ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent
us-gaap:StatementEquityComponents
us-gaap:ReclassificationFromAociCurrentPeriodTax

us-gaap:RepaymentsOfLongTermCapitalLeaseObligations
us-gaap:DebtInstrument, us-gaap:LongtermDebtType
us-gaap:RepaymentsOfSeniorDebt

us-gaap:RestructuringCharges
us-gaap:RestructuringPlan
us-gaap:RestructuringPlan
us-gaap:RestructuringReserveAccrualAdjustment1

us-gaap:RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability

us-gaap:RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability

us-gaap:ShortTermLeaseCost

us-gaap:StockIssuedDuringPeriodValueShareBasedCompensation
us-gaap:StatementEquityComponents

us-gaap:WorkersCompensationDiscountPercent
us-gaap:EnvironmentalRemediationContingency
kalu:AccrualForEnvironmentalLossContingenciesIncludesLongTermAndShortTermLiabilities

kalu:AccruedAnnualVEBAContribution

kalu:AccruedAnnualVebaContribution
us-gaap:BusinessAcquisition
kalu:BusinessCombinationRecognizedIdentifiableAssetAcquiredAndLiabilityAssumedPensionAndOtherPostRetirementBenefits
us-gaap:Restatement, us-gaap:BusinessAcquisition
us-gaap:BusinessAcquisition
kalu:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivablesOther
us-gaap:Restatement, us-gaap:BusinessAcquisition
us-gaap:BusinessAcquisition
kalu:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesEmployeeRelatedLiabilities
us-gaap:Restatement, us-gaap:BusinessAcquisition
us-gaap:MeasurementInputType
kalu:ConditionalAssetRetirementObligationMeasurementInput

kalu:ConstructionInProgressExpectedToResumeOnFutureDate

kalu:ConstructionInProgressTemporarilyIdled

kalu:DeferredTaxAssetsLeasedAssets

kalu:DeferredTaxAssetsOperatingLossCarryforwardsAndTaxCredits

kalu:DefinedBenefitPlanExpectedFutureBenefitPaymentAfterYearFourForNextFiveYears
us-gaap:RetirementPlanName, us-gaap:RetirementPlanType

kalu:DiscountFeesRecognized
us-gaap:Range
kalu:EstimatedAnnualContributionToPensionAndOtherPostretirementBenefitPlans
us-gaap:Range, us-gaap:RetirementPlanName

kalu:ExcessOfStatedLIFOValueOverReplacementOrCurrentCosts

kalu:FinanceLeaseLiabilityPaymentsDueAfterYearFour

kalu:LeaseLiability

kalu:LeaseRightOfUseAsset

kalu:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFour

kalu:MultiemployerPlansCollectiveBargainingArrangementPercentageOfEmployersParticipantsToAllEmployees

kalu:NetLiabilityInRespectOfVeba

kalu:UnpaidClaimLiabilitiesRelatingToInsuranceRecoverables

kalu:WorkersCompensationCharges

kalu:Workerscompensationliabilityundiscounted
us-gaap:AccountsNotesLoansAndFinancingReceivablesByBillingStatusType
us-gaap:AccountsReceivableGrossCurrent

us-gaap:AccrualForEnvironmentalLossContingencies
us-gaap:EnvironmentalRemediationContingency
us-gaap:DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensation
us-gaap:AccruedBonusesCurrentAndNoncurrent

us-gaap:AccruedEmployeeBenefitsCurrentAndNoncurrent

us-gaap:AccruedEnvironmentalLossContingenciesCurrent

us-gaap:AccruedEnvironmentalLossContingenciesNoncurrent

us-gaap:AccruedLiabilitiesAndOtherLiabilities

us-gaap:AllowanceForDoubtfulAccountsReceivableCurrent

us-gaap:AssetRetirementObligation

us-gaap:AssetsHeldForSaleNotPartOfDisposalGroup

us-gaap:BankOverdrafts

us-gaap:BuildingsAndImprovementsGross
us-gaap:BusinessAcquisition
us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets
us-gaap:Restatement, us-gaap:BusinessAcquisition
us-gaap:BusinessAcquisition
us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables
us-gaap:Restatement, us-gaap:BusinessAcquisition
us-gaap:BusinessAcquisition
us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable
us-gaap:Restatement, us-gaap:BusinessAcquisition
us-gaap:BusinessAcquisition
us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesOther
us-gaap:Restatement, us-gaap:BusinessAcquisition
us-gaap:BusinessAcquisition
us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory
us-gaap:Restatement, us-gaap:BusinessAcquisition
us-gaap:BusinessAcquisition
us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets
us-gaap:Restatement, us-gaap:BusinessAcquisition
us-gaap:BusinessAcquisition
us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
us-gaap:Restatement, us-gaap:BusinessAcquisition
us-gaap:BusinessAcquisition
us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet
us-gaap:Restatement, us-gaap:BusinessAcquisition
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:CashAndCashEquivalentsFairValueDisclosure
us-gaap:FairValueByMeasurementFrequency

us-gaap:CashCashEquivalentsAndShortTermInvestments

us-gaap:ContractWithCustomerAssetNetCurrent
us-gaap:DebtInstrument, us-gaap:LongtermDebtType
us-gaap:DebtInstrumentFaceAmount
us-gaap:DebtInstrument, us-gaap:LongtermDebtType
us-gaap:DebtInstrumentFairValue
us-gaap:DebtInstrument, us-gaap:LongtermDebtType
us-gaap:DebtInstrumentInterestRateEffectivePercentage
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:DeferredCompensationPlanAssets

us-gaap:DeferredIncomeTaxAssetsNet

us-gaap:DeferredIncomeTaxLiabilities

us-gaap:DeferredTaxAssetsInventory

us-gaap:DeferredTaxAssetsOther

us-gaap:DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions

us-gaap:DeferredTaxLiabilitiesDeferredExpenseCapitalizedInventoryCosts

us-gaap:DeferredTaxLiabilitiesLeasingArrangements

us-gaap:DeferredTaxLiabilitiesPropertyPlantAndEquipment
us-gaap:BalanceSheetLocation, us-gaap:RetirementPlanName
us-gaap:DefinedBenefitPlanAccumulatedBenefitObligation
us-gaap:RetirementPlanName, us-gaap:RetirementPlanType
us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType
us-gaap:RetirementPlanName
us-gaap:DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax
us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType
us-gaap:RetirementPlanName
us-gaap:DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax
us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType
us-gaap:RetirementPlanName
us-gaap:DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax
us-gaap:RetirementPlanName
us-gaap:DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate
us-gaap:RetirementPlanName, us-gaap:RetirementPlanType
us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType
us-gaap:RetirementPlanName, us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncrease
us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType
us-gaap:RetirementPlanName, us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationWeightedAverageInterestCreditingRate
us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType
us-gaap:RetirementPlanName
us-gaap:DefinedBenefitPlanBenefitObligation
us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter
us-gaap:RetirementPlanName
us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths
us-gaap:RetirementPlanName
us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive
us-gaap:RetirementPlanName
us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour
us-gaap:RetirementPlanName
us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree
us-gaap:RetirementPlanName
us-gaap:RetirementPlanName, us-gaap:RetirementPlanType
us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo
us-gaap:RetirementPlanName
us-gaap:RetirementPlanName, us-gaap:RetirementPlanType
us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType
us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanExpectedFutureEmployerContributionsNextFiscalYear
us-gaap:RetirementPlanName, us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanExpectedFutureEmployerContributionsRemainderOfFiscalYear

us-gaap:DefinedBenefitPlanFairValueOfPlanAssets
us-gaap:RetirementPlanName
us-gaap:DefinedBenefitPlanFundedStatusOfPlan
us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType
us-gaap:RetirementPlanName, us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanHealthCareCostTrendRateAssumedNextFiscalYear
us-gaap:DefinedBenefitPlanByPlanAssetCategories, us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanPlanAssetsTargetAllocationPercentage
us-gaap:RetirementPlanName, us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanUltimateHealthCareCostTrendRate1
us-gaap:DefinedBenefitPlanByPlanAssetCategories, us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanWeightedAverageAssetAllocations
us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:HedgingDesignation, us-gaap:Position
us-gaap:DerivativeAssetsLiabilitiesAtFairValueNet
us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:HedgingDesignation
us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:HedgingDesignation, us-gaap:Position
us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:ProductOrService, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:HedgingDesignation, us-gaap:Position
us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation, us-gaap:Position
us-gaap:DerivativeNonmonetaryNotionalAmount
us-gaap:DerivativeInstrumentRisk, us-gaap:Position
us-gaap:DerivativeInstrumentRisk, us-gaap:StatementScenario
us-gaap:DerivativeNonmonetaryNotionalAmountPercentOfRequiredNeedCoverage
us-gaap:ProductOrService, us-gaap:StatementScenario
us-gaap:StatementScenario, us-gaap:DerivativeInstrumentRisk

us-gaap:EmployeeRelatedLiabilitiesCurrent
us-gaap:AwardType
us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized

us-gaap:ExcessOfReplacementOrCurrentCostsOverStatedLIFOValue

us-gaap:FinanceLeaseLiability

us-gaap:FinanceLeaseLiabilityCurrent

us-gaap:FinanceLeaseLiabilityNoncurrent

us-gaap:FinanceLeaseLiabilityPaymentsDue

us-gaap:FinanceLeaseLiabilityPaymentsDueAfterYearFive

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:FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearFive

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearFour

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearThree

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo

us-gaap:FiniteLivedIntangibleAssetsGross
us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:GoodwillGross
us-gaap:BusinessAcquisition

us-gaap:GoodwillImpairedAccumulatedImpairmentLoss

us-gaap:InterestPayableCurrent

us-gaap:InventoryRawMaterials

us-gaap:InventoryWorkInProcess

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths

us-gaap:LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear
us-gaap:CreditFacility
us-gaap:LettersOfCreditOutstandingAmount
us-gaap:CreditFacility
us-gaap:LineOfCreditFacilityCurrentBorrowingCapacity
us-gaap:CreditFacility
us-gaap:LineOfCreditFacilityRemainingBorrowingCapacity

us-gaap:LossContingencyRangeOfPossibleLossPortionNotAccrued

us-gaap:OperatingLeaseWeightedAverageDiscountRatePercent

us-gaap:OperatingLossCarryforwards
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:OtherAssetsFairValueDisclosure
us-gaap:FairValueByMeasurementFrequency

us-gaap:OtherInventorySupplies

us-gaap:OtherReceivables

us-gaap:OtherSundryLiabilitiesNoncurrent

us-gaap:RestrictedCashAndCashEquivalentsNoncurrent

us-gaap:RestructuringReserve
us-gaap:RestructuringPlan

us-gaap:SelfInsuranceReserveNoncurrent
us-gaap:AwardType
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
us-gaap:AwardType
us-gaap:SharePrice

us-gaap:StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1
us-gaap:TaxCreditCarryforward
us-gaap:TaxCreditCarryforwardAmount
us-gaap:DebtInstrument, us-gaap:LongtermDebtType
us-gaap:UnamortizedDebtIssuanceExpense

us-gaap:UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued

us-gaap:UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate

Plots across concepts


IncomeStatement
Income Loss From Continuing Operations 
Before Income Taxes Minority Interest And Income Loss From Equity Method Investments
Expenses
Other Nonoperating Income Expense
Balance Sheet
Goodwill
Assets
Operating Lease Right Of Use Asset
Current Assets
Prepaid Expense And Other Assets Current
NonCurrent Assets
Deferred Income Tax Assets Net
PropertyPlantAndEquipmentNet
Accumulated Depreciation Depletion And Amortization Property Plant And Equipment
Liabilities
Operating Lease Liability
Current Liabilities
Operating Lease Liability Current
Noncurrent Liabilities
Deferred Income Tax Liabilities Net
Stockholders Equity
Common Stock Value
CashFlow
Net Income Loss
NetCashProvidedByUsedInOperatingActivities
Net Income Loss
NetCashProvidedByUsedInFinancingActivities
Payments For Repurchase Of Common Stock
Shares
Weighted Average Number Of Diluted Shares Outstanding
DividendsAndRepurchase
Payments For Repurchase Of Common Stock
OperatingLeaseLiability
Operating Lease Liability Current
NonoperatingIncomeExpense
Nonoperating Income Expense
LesseeOperatingLeaseLiabilityPaymentsDue
Lessee Operating Lease Liability Payments Due Year Four
FiniteLivedIntangibleAssets
Finite Lived Intangible Assets Accumulated Amortization
InventoryNet
Inventory Finished Goods
AccountsReceivable
Allowance For Doubtful Accounts Receivable Current

Tables

  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding ▁█15.83515.987NA15.86515.78116.008NA16.12516.2416.372NA16.78316.90517.031NA17.1617.20117.603NA18.17518.19418.2NA18.17218.19217.344NA18.61918.45818.514NA19.05818.94519.366NA19.28819.219.161NA18.99918.9840.01895NA18.94118.9170.02002
us-gaap:WeightedAverageNumberOfSharesOutstandingBasic █▁15.83515.805NA15.79415.78115.838NA15.95616.06316.108NA16.57316.68516.707NA16.83417.00317.385NA17.84117.87117.864NA17.12317.00617.344NA17.70717.84117.921NA18.54818.74219.143NA19.15419.13719.059NA18.99918.9840.01895NA18.94118.9170.02002
us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount █▁226.022.0NA69.071.00.002NA0.0070.0090.004NA0.00.0020.0NA0.0030.0550.066NA0.0030.0020.05NA0.00.00.84NA0.0760.0640.035NANANANANANANANANANANANANANANANA
us-gaap:EarningsPerShareBasic ▇▇▇▇▇█▇███████▇█▇████████▁████████▇███▇▇▇▇▇▇▇▇-1.420.280.37000000000000010.02-0.411.83-0.661.591.191.741.441.311.241.54-0.91.180.282.071.390.841.451.470.761.291.19-16.850.880.91.380.881.481.370.991.750.481.521.11.390.330.230.240.59-0.050.290.010.44
us-gaap:EarningsPerShareDiluted ▇▇▇▇▇█▇███████▇█▇████████▁████████▇███▇▇▇▇▇▇▇▇-1.420.280.37000000000000010.02-0.411.81-0.661.571.181.711.411.291.221.51-0.91.160.272.041.370.821.431.440.731.211.11-16.850.850.851.330.851.441.340.981.730.471.511.091.380.330.230.240.59-0.050.290.010.44
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
 TTM Greenblatt ROC _ _▇▇▇▇▇█▇█████████▇████████▁████████████▇▇▇▇▇11.116.918.512.34.745.69.640.732.443.036.934.934.737.140.039.811.459.545.329.857.944.835.240.537.0-458.626.832.646.432.141.641.640.150.023.956.239.646.215.65.515.420.511.6NANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:ComprehensiveIncomeNetOfTax ▆▇▇▇▇▇▆▇▇▇▇▇▇▇▆▇▇▇▇▇▇▇▇▇▇▁▅▇▇▇▇▇▇▇█▇▇▇▅▇▇▇-6.513.621.28.65.313.6-6.024.516.037.714.620.927.117.4-19.221.55.837.316.616.026.927.210.322.220.6-225.3-64.117.226.616.729.526.019.934.764.630.122.527.6-61.55.24.911.2NANANANA
us-gaap:CostOfGoodsAndServicesSold █▂▁▁▁▂▂▂▂▃▃▃▃▃▂▂▂▂673.3262.5221.8208.4224.5286.6298.0298.6303.5315.1317.3323.3343.4316.7277.2256.4289.6262.7NANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:CostsAndExpenses ▇▂▁▁▁▂▂▂▂▂▂▂▃▂▂▂▂▂▂▂▁▂▁▂▂█▂▂▂▂▁▁▂▂▂▁▂▂▂▂▂▂▁▁▁▁729.9307.1253.5243.4271.0323.7359.1334.2342.9352.2352.5358.2380.7350.9313.1293.0344.9295.8286.6290.8277.0298.4281.4295.9330.2830.3311.2306.3297.7303.0269.7278.3288.8287.4290.1279.3305.6319.2304.0316.8323.4302.1253.4250.2278.4252.7
us-gaap:GainsLossesOnExtinguishmentOfDebt -35.9NANANANANANANANANANANANANA0.00.00.0NA0.00.0-11.1NA0.00.00.0NANANANANANANANANANANANANANANANANANANANANA
 us-gaap:GainsLossesOnExtinguishmentOfDebt us-gaap:DebtInstrument,us-gaap:LongtermDebtType kalu:SeniorNotesDueTwoThousandAndTwentyFive,us-gaap:SeniorNotesNANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments ▇▇▇▇▇█▇█████████▇████████▁████████▇███▇▇▇█▇▇▇▇-37.94.25.7-0.3-5.338.7-18.034.126.537.830.029.928.531.635.636.06.954.539.824.341.741.429.334.732.2-468.017.825.139.025.235.535.730.341.715.247.434.242.810.95.17.617.76.35.91.215.0
us-gaap:IncomeTaxExpenseBenefit ▆▆▆▆▆▇▆▇▇▇▇▇▇▇█▇▆▇▇▇▇▇▇▇▇▁▆▇▇▇▇▇▇▇▇▇▇▇▇▆▇▇▇▆▆▇-15.5-0.3-0.2-0.71.39.6-7.48.77.39.86.48.27.85.950.816.12.218.515.39.415.715.116.012.612.0-175.82.29.214.59.48.210.311.78.26.118.213.216.36.00.73.16.46.60.41.16.2
us-gaap:IncomeTaxesPaid ▅▂▂▁▂▁▆▂▇▃▂▂█▂▂▂▂▂▂▁▂▂▂▂▃▄▃▅▂▃▂▂▃▃▃▂▂▂▆▂▃▁▂▁1.40.40.50.10.30.11.90.52.20.90.30.42.70.20.50.30.30.20.30.10.50.30.40.30.61.00.81.60.40.70.30.50.60.70.90.40.30.22.10.40.90.10.50.0NANA
us-gaap:InterestExpense ████▇▄▅▄▄▄▄▄▄▄▄▄▄▄▄▄▄▃▃▄▄▇▇▆▆▆▆▆▆▆▆▆▅▃▄▃▃▄▄▃▃▁12.412.312.212.110.56.17.35.85.85.75.75.75.75.65.85.35.55.65.65.55.53.74.24.95.29.89.89.79.28.88.68.89.09.39.39.26.54.14.84.34.44.54.63.73.50.0
 us-gaap:InterestExpenseDebt us-gaap:DebtInstrument,us-gaap:LongtermDebtType kalu:SeniorNotesDueTwoThousandAndTwentyFive,us-gaap:SeniorNotesNANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:InterestExpenseLongTermDebt us-gaap:DebtInstrument,us-gaap:LongtermDebtType kalu:SeniorNotesDueTwoThousandAndTwentyFive,us-gaap:SeniorNotes▁███▄3.26.06.06.04.2NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:InterestExpenseLongTermDebt us-gaap:DebtInstrument,us-gaap:LongtermDebtType kalu:UnsecuredSeniorNotesDueJuneOneTwoThousandAndThirtyOne,us-gaap:SeniorNotes2.9NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:InterestPaidNet █▇▇▇▁▄█▁▇▁▇▁▇▁12.611.711.711.60.06.113.0-0.110.40.311.0-0.110.40.3NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:NetIncomeLoss ▇▇▇▇▇█▇███████▇█▇████████▁████████▇███▇▇▇▇▇▇▇▇-22.44.55.90.4-6.629.1-10.625.419.228.023.621.720.725.7-15.219.94.736.024.514.926.026.313.322.120.2-292.215.615.924.515.827.325.418.633.59.129.221.026.56.14.44.511.3-0.95.50.18.8
 us-gaap:NetIncomeLoss us-gaap:StatementEquityComponents us-gaap:RetainedEarnings▁█-22.44.5NA0.4-6.629.1NA25.419.228.023.621.720.725.7-15.219.94.736.024.514.926.026.313.322.120.2-292.215.615.924.515.827.325.418.633.59.129.221.026.54.94.44.511.3NANANANA
us-gaap:NonoperatingIncomeExpense ▁█████▄██-36.6-0.4-0.6-0.50.5-0.8-20.3-0.8-0.1NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:OperatingIncomeLoss ▇▇▇▇▇█▇█████████▇████████▁████████████▇▇▇▇▇▇▇▇11.116.918.512.34.745.69.640.732.443.036.934.934.737.140.039.811.459.545.329.857.944.835.240.537.0-458.626.832.646.432.141.641.640.150.023.956.239.646.215.65.515.420.511.613.24.014.8
us-gaap:OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax ▄▁▄█0.0-0.10.00.1NANANANANANANANANANANANANANANANANANA0.4-0.30.00.10.20.1-0.10.2-0.3-0.30.40.40.2-0.50.4-0.3-0.30.8NANANANANANA
us-gaap:OtherNonoperatingIncomeExpense ▁▇▇▇▇▇▄▇▇▇▇▇▇▇██▇▇▇▇▅▇▇▇▇▇▇█████▇▇▇▇█▇██▇█▇▇▇▇-36.6-0.4-0.6-0.50.5-0.8-20.3-0.8-0.10.5-1.20.7-0.50.11.41.51.00.60.10.0-10.70.3-1.7-0.90.40.40.82.21.81.92.52.9-0.81.00.60.41.10.72.13.9-3.41.7-1.5-3.60.70.2
 us-gaap:OtherNonoperatingIncomeExpense us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship us-gaap:FairValueHedgingNANA-2.20.5NANANA0.8NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax █▂▁▁▁▃▃▃▃▃▃▃▃▃▂▂▂▂▂▂▂▂▂▂▃▃▂▂▂▂▂▂▂▂▂▂▂▃▂▂▂▂▁▁▁▁741.0324.0272.0255.7275.7369.3368.7374.9375.3395.2389.4393.1415.4388.0353.1332.8356.3355.3331.9320.6334.9343.2316.6336.4367.2371.7338.0338.9344.1335.1311.3319.9328.9337.4314.0335.5345.2365.4317.6322.3338.8322.6265.8263.4282.4267.5
us-gaap:Revenues █▂▁▁▁▃▃▃▃▃▃▃▃▃▂▂▂▂▂▂▂▂▂▂▃▃▂▂▂▂▂▂▂▂▂▂▂▃▂▂▂▂▁▁▁▁741.0324.0272.0255.7275.7369.3368.7374.9375.3395.2389.4393.1415.4388.0353.1332.8356.3355.3331.9320.6334.9343.2316.6336.4367.2371.7338.0338.9344.1335.1311.3319.9328.9337.4314.0335.5345.2365.4317.6322.3338.8322.6265.8263.4282.4267.5
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:Assets █▆▅▅▅▃▃▂▂▂▂▂▂▂▂▂▂▂▂▂▂▁▁▁▁▃▄▄▄▄▄▄▄▄▄▄▄▂▁▂▂▂▂2414.52152.81864.71847.01848.41553.11526.21426.31422.11447.81419.31426.01423.81405.41385.21422.71386.71413.11443.51433.41421.61236.61250.11263.11251.31534.91743.71816.31772.61766.01770.91792.01739.71764.41752.51694.31661.41390.31320.61381.31419.81370.81342.4NANANA
us-gaap:Liabilities █▆▅▅▅▃▃▂▂▃▂▂▂▂▂▂▂▂▂▂▂▁▁▁▁▃▃▃▂▂▂▃▂▂▂▂▂▁▁▁▁▁▁1693.81417.81132.31127.71129.6832.0792.3674.9675.8699.9678.9663.5662.8651.8638.9639.1617.9614.5638.8619.3613.3448.8475.7490.8492.5780.6727.8715.6678.9683.7686.7696.9662.9679.6681.7684.0677.8453.0447.8419.2458.9445.4430.2NANANA
us-gaap:LiabilitiesAndStockholdersEquity █▆▅▅▅▃▃▂▂▂▂▂▂▂▂▂▂▂▂▂▂▁▁▁▁▃▄▄▄▄▄▄▄▄▄▄▄▂▁▂▂▂▂2414.52152.81864.71847.01848.41553.11526.21426.31422.11447.81419.31426.01423.81405.41385.21422.71386.71413.11443.51433.41421.61236.61250.11263.11251.31534.91743.71816.31772.61766.01770.91792.01739.71764.41752.51694.31661.41390.31320.61381.31419.81370.81342.4NANANA
us-gaap:StockholdersEquity ▁▁▁▁▁▁▁▂▂▂▁▂▂▂▂▂▂▂▃▃▃▂▂▂▂▂▆███████▇▆▆▅▄▅▅▅▅720.7735.0732.4719.3718.8721.1733.9751.4746.3747.9740.4762.5761.0753.6746.3783.6768.8798.6804.7814.1808.3787.8774.4772.3758.8754.31015.91100.71093.71082.31084.21095.11076.81084.81070.81010.3983.6937.3872.8962.1960.9925.4912.2NANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:AssetsCurrent █▆▇▇▇▅▄▃▃▃▃▃▄▃▃▃▃▃▃▃▃▁▂▂▂▅▅▅▄▃▃▄▄▄▄▄▄▂▁▁▁▁▂1200.6930.81121.41109.61107.7806.4779.8668.6649.7671.1656.6673.0704.8682.3656.6662.6615.8636.2655.9657.9640.4447.8501.6564.5546.5823.2825.2822.9769.1677.0690.8752.6736.3757.5741.7755.7722.5482.2434.5408.1439.7433.1471.4NANANA
us-gaap:Cash NANA780.3750.1710.6199.628.229.332.229.322.923.218.117.323.517.330.723.537.926.850.634.540.337.142.3204.929.5NA69.768.557.789.578.182.9107.9135.4NANA49.8NANANANANANANA
us-gaap:CashAndCashEquivalentsAtCarryingValue ▃▂██▇▄▃▂▂▂▂▂▂▂▁▁▁▁▁▁▃▁▁▂▁▃▂▃▂▂▂▃▃▃▃▃▄▁▁▁▁▁▂▂▂▂283.1128.0780.3750.1710.6307.2264.3172.1122.4115.3125.694.3164.0135.051.173.957.134.455.272.9195.370.772.582.654.3220.9177.7212.3174.2185.6169.5224.6281.7248.0273.4255.6317.877.349.823.659.855.9135.6143.7134.4135.5
us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents ▃▂██▇▄▃▂▂▂▂▂▂▂▁▁▁▁▁▁296.9141.8794.3764.1724.6321.1278.6186.5136.9129.4139.6109.1178.8148.264.387.170.446.767.784.9NANA83.7NANANA188.0NANANANANANANANANANANANANANANANANANANA
us-gaap:AccountsReceivableNetCurrent █▆▂▂▂▃▃▃▃▄▃▄▃▃▃▂▂▃▂▂▂▂▂▂▂▃▂▂▂▂▂▂▂▂▂▃▂▂▁▂▂▂▁389.2305.8112.8119.0126.4175.2167.1188.1178.1195.8179.8194.5191.2185.3165.0138.2145.6157.0137.7142.2134.6138.8116.7131.6138.6149.7129.3132.4123.1123.5119.8122.1122.7141.8123.8156.4131.3130.198.9129.1119.1114.083.0NANANA
us-gaap:InventoryNet ██▁▁▂▂▂▂▃▃▃▂▂▂▃▃▂▃▂▃▃▃▃▃▃▃▃▃▂▃▃▃▃▂▂▂▂▂▃▂▂▂▁383.2385.3152.0157.5181.4194.6177.6192.5231.1233.9215.1196.2177.2176.8207.9212.2199.9203.5201.6223.6217.5210.6219.6217.3217.3218.0214.7211.3198.1203.1214.4207.9202.9199.3186.0189.0196.8198.2205.7194.6178.2169.6167.5NANANA
us-gaap:InventoryFinishedGoods ▅█▂▁▂▂▂▂▃▃▃▂▂▂▅▅▅▆▇▆▅▆█▅▅▆▇▅▅▆▇▆▅▅▅▅▅▆▇▅▄59.583.037.233.240.843.142.641.444.247.148.041.436.840.563.864.860.768.473.870.165.266.879.563.164.669.873.664.960.465.972.568.661.761.259.960.462.067.575.961.755.7NA53.8NANANA
us-gaap:InventoryLIFOReserve NANA8.4NANANA11.9NANANA31.7NANANA24.3NANANA-8.5NANANA-24.1NANANA37.6NANANA0.4NA11.620.824.515.821.526.429.449.2NANA36.4NANANA
us-gaap:PrepaidExpenseAndOtherAssetsCurrent ▃▂▂▂▂▁▁▁▁▂▁▂▂▂▂▂▂▂▁▁▁▁▃▄▄█▇▇▆▂▂▃▃▃▃▃▃▃▄▃▄59.635.828.625.425.720.419.418.421.723.018.924.229.025.733.431.526.834.018.510.912.89.156.798.6100.4195.8178.6156.4135.548.644.267.670.171.070.173.174.775.378.958.978.8NA80.1NANANA
us-gaap:Land ██▂▂▂▁▂▂▂▂▂▂▁▁▁▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▄▄26.626.921.521.521.620.821.421.421.421.421.421.421.121.121.122.722.822.722.722.722.722.722.722.722.722.922.922.822.822.822.622.622.622.622.622.622.622.622.623.323.3NA23.3NANANA
us-gaap:MachineryAndEquipmentGross ██▅▅▅▅▅▅▅▅▅▄▄▄▄▄▃▃▃▃▃▃▃▃▃▃▂▂▂▂▂▂▂▁▁▁▁▁▁▁▁1106.31144.7847.4836.3826.9821.0813.5797.9783.6766.9755.6736.3719.7698.6689.1675.0625.0620.8615.1585.2573.8559.3549.0528.1523.2518.0509.8500.0491.2455.3425.6416.5406.5403.5400.4391.6379.1362.7356.7351.8346.5NA338.0NANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:NoncurrentAssets NANA627.2NANANA622.0NANANA611.8NANANA571.4NANANA530.9NANANA495.4NANANA454.9NANANA429.3NANANA384.3NANANA367.8NANANA354.1NANANA
 us-gaap:NoncurrentAssets us-gaap:StatementGeographical country:USNANA597.5NANANA592.9NANANA581.7NANANA541.2NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:NoncurrentAssets us-gaap:StatementGeographical us-gaap:NonUsNANA29.7NANANA29.1NANANA30.1NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:PropertyPlantAndEquipmentGross ██▅▅▅▅▅▅▅▅▄▄▄▄▄▄▄▃▃▃▃▃▃▃▃▂▂▂▂▂▂▂▂▂▁▁▁▁▁▁▁1383.81416.01023.91007.81000.7992.6972.6953.9941.8927.9917.6892.2870.3854.5837.4815.7800.2774.8761.2740.0725.8709.3692.0661.8646.1632.5621.7603.3593.4581.6567.2541.7522.0503.4494.7474.5466.5458.2449.3439.5430.4NA412.5NANANA
us-gaap:ConstructionInProgressGross █▇▄▄▄▅▄▄▄▄▅▄▄▅▄▃▇▅▄▅▅▆▅▅▄▃▃▂▃▅▇▅▄▃▂▁▂▂▃▂▂74.668.437.838.242.044.033.235.438.141.843.638.136.642.935.127.862.442.334.847.345.754.848.542.636.127.425.218.124.749.366.050.141.125.620.89.815.023.624.118.614.8NA7.7NANANA
us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment ██▇▇▇▇▆▆▆▆▆▅▅▅▅▅▄▄▄▄▄▄▃▃▃▃▃▃▂▂▂▂▂▂▂▂▁▁▁▁▁433.9411.1398.4386.6375.1364.0352.2341.2329.6318.6307.4298.4288.0277.7267.9258.2248.4239.3230.6221.7213.4205.1196.9189.4181.9174.4166.8160.4152.0144.9137.9131.0124.7118.0111.4105.298.992.886.981.175.4NA63.9NANANA
us-gaap:AmortizationOfIntangibleAssets █▂▂▂▂▂▂▂▂▂▂▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▂▁▂▁▂▁▂▂2.90.70.80.70.70.70.70.70.70.70.70.40.30.40.40.30.30.40.30.40.40.40.40.40.40.40.40.40.40.40.40.40.50.40.50.40.50.40.60.5NA0.6NANANA0.0
us-gaap:PropertyPlantAndEquipmentNet ▇█▄▄▄▄▄▄▄▄▄▄▃▃▃▃▃▃▃▃▃▃▃▂▂▂▂▂▂▂▂▂▁▁▁▁▁▁▁▁▁▁▁951.91006.6627.2622.9627.1630.9622.0614.3613.8610.9611.8595.4584.2578.7571.4557.8552.1535.8530.9518.6512.7504.5495.4472.7464.5458.1454.9442.9441.4436.7429.3411.7398.3386.4384.3374.7373.0370.8367.8363.8360.4358.1354.1NANANA
us-gaap:Goodwill ▇█▄▄▄▄▄█████▄▄▄▄▄▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▁39.346.218.818.818.818.818.844.044.044.044.043.418.818.818.818.818.837.237.237.237.237.237.237.237.237.237.237.237.237.237.237.237.237.237.237.237.237.237.237.237.237.23.1NANANA
us-gaap:FiniteLivedIntangibleAssetsNet ██▃▃▃▃▃▃▃▃▄▄▃▃▃▃▃▃▃▃▃▃▃▃▃▃▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▁79.682.526.727.428.128.929.630.331.031.732.433.024.324.625.025.325.726.026.426.729.730.130.530.931.331.732.132.532.933.333.734.134.535.035.435.936.336.837.237.838.338.84.0NANANA
us-gaap:OperatingLeaseRightOfUseAsset ██▆▆▆▆▆▆▆▆▁39.538.926.527.228.028.825.826.326.827.40.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:OtherAssetsNoncurrent ▇▃▃▃▃▂▂▂▃▃▂▃▃▂▃▃▂▂▂▁▁▁▁▁▁▁▁▁▁███▆▆▆▆▅▄▅▅▆▅▆102.447.844.141.138.737.338.436.541.340.338.639.040.237.341.439.536.037.133.422.120.719.522.822.123.123.023.323.824.0108.5104.8109.178.588.886.084.273.863.072.364.880.974.083.0NANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:AccountsPayableCurrent █▆▂▁▁▃▂▂▂▃▃▃▃▃▂▂▂▂▂▁▂▁▂▁▂▂▂▂▂▂▁▁▂▂▁▁▁▁▁▁▂▁▁344.1259.686.163.461.0113.992.093.8101.3124.4121.4120.4132.0120.290.094.484.284.475.869.672.370.276.769.377.483.181.489.372.172.362.971.373.273.262.566.066.565.462.262.373.763.750.8NANANA
us-gaap:LiabilitiesCurrent █▆▁▁▁▂▂▂▂▂▂▂▂▂▂▂▁▁▂▁▁▁▂▂▁█▇█▇▁▁▁▁▁▁▁▁▁▁▁▂▂▁439.5350.4158.3142.2150.4199.1170.4175.8178.9204.2205.5192.5194.1184.5173.1176.7156.3153.9165.0159.2153.0160.7169.3169.2163.5448.9426.4428.5389.0142.8150.6151.4147.1157.2161.6157.4162.4163.7149.8153.5164.9164.4142.3NANANA
us-gaap:OperatingLeaseLiabilityCurrent ██▂▂▂▂▂▂▁▁8.48.14.44.54.54.53.93.93.63.5NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:OtherAccruedLiabilitiesCurrent ▂▃▂▂▂▂▂▂▂▂▂▁▁▁▂▂▁▂▂▂▂▂▂▃▂█▇▇▆▁▂▂▂▁▂▂▂▂▂▂▁▂▂55.558.941.445.354.556.944.050.147.251.644.037.029.935.640.543.337.540.439.946.744.256.552.761.451.6157.2132.8131.7115.137.144.840.939.938.451.941.946.342.641.041.034.442.542.0NANANA
us-gaap:TaxesPayableCurrent ▇█▃▆▆█▄▅▅▇▄▆▅█▄▆▅▇▂▅▄▆▁▄▄▆▃▄▄▅▂▃▃▃▁▂9.910.45.28.78.410.36.28.07.89.96.58.27.210.86.89.07.79.54.37.86.78.63.16.46.38.25.26.36.37.64.35.75.75.43.14.5NANA2.6NANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:LongTermDebtNoncurrent █▇▇▇▇▄▄▃▃▃▃▃▃▃▃▃▃▃▃▃▃▂▂▂▃▃▃▃▃▄▄▄▄▄▄▄▄▁▁▁▁▁▁1035.5838.7838.1837.6837.1492.8492.6371.1370.9370.6370.4370.2370.0369.8369.6369.4369.2368.9368.7368.5368.2194.8197.8218.9225.0225.0225.0225.0225.0390.7388.5386.4384.3382.3380.3378.4376.63.03.43.77.67.911.8NANANA
us-gaap:DeferredIncomeTaxLiabilitiesNet ▁█▇▄▃▁▁4.615.913.98.97.34.54.5NANANA4.2NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent ██▁87.085.01.3NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:OtherLiabilitiesNoncurrent ▅▅▅▅▅▅▄▂▂▂▄▂▂▂▄▂▂▂▄▁▁▁▅▁▁▁▄▁▁▁█▁▇▇▇▇▇▇▇▇█▇▇75.876.378.680.375.375.367.026.324.723.266.425.824.823.460.020.820.819.873.23.43.43.287.53.23.23.358.32.82.92.7146.43.4127.0135.2134.5128.3118.7116.1126.0115.7141.8130.1134.7NANANA
us-gaap:OperatingLeaseLiabilityNoncurrent ██▆▆▆▇▆▆▆▆▁34.434.125.626.327.027.825.225.626.026.60.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo █▇▁▁8.07.55.04.9NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree █▇▁▁7.26.74.64.5NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour ▆▁█▇4.03.64.24.1NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive NANA2.3NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive NANA16.9NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:StockholdersEquity ▁▁▁▁▁▁▁▂▂▂▁▂▂▂▂▂▂▂▃▃▃▂▂▂▂▂▆███████▇▆▆▅▄▅▅▅▅720.7735.0732.4719.3718.8721.1733.9751.4746.3747.9740.4762.5761.0753.6746.3783.6768.8798.6804.7814.1808.3787.8774.4772.3758.8754.31015.91100.71093.71082.31084.21095.11076.81084.81070.81010.3983.6937.3872.8962.1960.9925.4912.2NANANA
us-gaap:AdditionalPaidInCapitalCommonStock ███▇▇▇▇▇▇▇▇▇▆▆▇▆▆▆▆▆▅▅▅▅▅▄▄▄▄▄▄▄▄▄▃▃▃▃▂▂▂▁▁1073.21069.31068.61066.01063.31060.31062.91061.51059.21056.71059.31057.41054.71051.81055.91052.81049.31046.01047.41044.31041.21037.21036.51033.61031.41029.11028.51026.91026.01023.61023.11022.41021.11018.91017.71017.01015.51007.9998.4999.1997.9988.8987.1NANANA
us-gaap:RetainedEarningsAccumulatedDeficit ▄▅▅▅▅▆▅▆▆▅▅▅▄▄▃▄▄▄▃▃▃▂▂▂▁▁███▇▇▆▆▆▅▅▄▄▃▃▃▃▃116.9151.0158.2163.0173.4190.6172.8193.0177.3168.0150.2135.6123.1111.785.5109.097.6101.975.258.751.934.115.99.7-5.4-18.7280.4271.1261.4243.2233.8212.2191.8179.0151.2146.9122.6106.584.486.286.686.780.1NANANA
us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax █▇▆▅▅▄▅▅▅▅▄▅▅▄▅▅▅▅▅▆▆▅▅▆▆▆▁▆▆▆▆▆▆▆▆▂▂▂▂████6.3-9.6-18.7-34.0-42.2-54.1-38.6-43.2-42.3-39.1-48.8-39.8-39.0-45.4-36.7-32.7-34.3-35.4-36.7-28.8-29.9-30.8-31.7-28.7-28.8-29.2-96.1-16.4-17.7-19.8-20.7-22.9-23.5-24.8-26.0-81.5-82.4-83.9-85.01.81.41.41.7NANANA
us-gaap:TreasuryStockValue █████████▇▇▇▆▆▆▆▆▅▅▄▄▄▄▄▄▄▃▃▃▃▂▂▂▁▁▁▁▁▁▁▁▁▁475.9475.9475.9475.9475.9475.9463.4460.1448.1437.9420.5390.9378.0364.7358.6345.7344.0314.1281.4260.3255.1252.9246.5242.5238.6227.1197.1181.1176.2164.9152.2116.8112.888.572.372.372.372.372.372.372.372.372.3NANANA
us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue █▁3.63.1NA2.72.61.7NA2.33.42.41.92.72.72.83.13.53.43.03.03.13.02.62.52.22.52.11.60.92.32.00.71.41.92.60.41.61.12.51.41.21.21.4NANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:NetCashProvidedByUsedInOperatingActivities ▃▁▆▆▅▆██▅▄▅▄▆▄▃▆▇▂▆▄▆▃▆▆▅▂▃▄▅▄▃▅▅▂▅▄▅▄▅▁▃▃▂16.3-11.456.255.842.552.478.483.447.722.837.728.557.926.110.058.469.04.157.734.550.821.349.960.640.97.420.432.444.227.121.141.742.66.345.732.039.735.042.0-12.117.115.81.0NANANA
us-gaap:NetCashProvidedByUsedInInvestingActivities ▇▁▇▇▇▇▆▇▇▇█▆▇█▇▇▇▇▇▆▆▇▇▇▇█▇▇▇▇▇▆▇▇▇▆▇▇▇▇▇▆▇▇▇▇-9.3-626.6-14.7-5.128.118.6-72.5-11.6-18.71.031.0-75.8-4.780.6-11.2-30.8-4.921.4-47.9-143.8-78.8-5.9-24.7-15.5-12.172.7-33.217.0-38.19.6-36.0-89.621.9-9.7-23.0-88.9-8.2-1.8-8.9-9.8-8.2-89.4-4.0-12.4-12.2-17.8
us-gaap:NetCashProvidedByUsedInFinancingActivities ▆▃▃▃█▃▅▃▃▃▃▃▃▃▃▃▃▃▃▃▆▃▃▃▁▃▃▃▃▃▃▃▃▃▄▄▆▄▃▃▄▄▄▄▄▅148.1-14.5-11.3-11.2332.9-28.586.2-22.2-21.5-34.0-38.2-22.4-22.6-22.8-21.6-10.9-40.4-46.5-27.5-13.1152.6-17.2-35.3-16.8-195.4-36.9-21.8-11.3-17.5-20.6-40.2-9.2-30.8-22.0-4.9-5.3209.0-5.7-6.9-14.3-5.0-6.1-5.1-5.0-5.0100.5
us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect ▆▁▆▆█▆▆▆▅▅▆▅▆▆155.1-652.530.2000000000000639.5403.542.592.149.67.5-10.230.5-69.730.683.9NA16.723.7-21.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:DepreciationDepletionAndAmortization █▄▄▄▄▄▄▄▃▃▃▃▃▃▃▃▃▃▃▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▁▂▁▁▁25.813.513.112.913.013.212.812.312.111.911.511.010.910.510.410.29.59.69.39.09.08.78.28.18.18.08.08.07.77.47.26.97.07.06.96.76.66.36.36.26.45.75.74.8NA4.0
us-gaap:IncreaseDecreaseInInventories ▅█▅▃▄▇▄▁▅▇▇▇▅▆▅▇▅▆▃▆▆▅▆▅▅▆▆▇▅▄▆▅▅▆▆▄▅▄▄-3.124.3-5.5-23.9-13.217.0-14.9-38.6-2.818.819.415.60.49.6-4.312.3-3.61.9-22.06.16.9-4.14.90.0-0.73.33.413.2-5.0-11.32.1-1.8-5.69.65.6-13.5-6.3-10.4-8.8NANANANANANANA
us-gaap:NetCashProvidedByUsedInOperatingActivities ▃▁▆▆▅▆██▅▄▅▄▆▄▃▆▇▂▆▄▆▃▆▆▅▂▃▄▅▄▃▅▅▂▅▄▅▄▅▁▃▃▂16.3-11.456.255.842.552.478.483.447.722.837.728.557.926.110.058.469.04.157.734.550.821.349.960.640.97.420.432.444.227.121.141.742.66.345.732.039.735.042.0-12.117.115.81.0NANANA
us-gaap:NetIncomeLoss ▇▇▇▇▇█▇███████▇█▇████████▁████████▇███▇▇▇▇▇▇▇▇-22.44.55.90.4-6.629.1-10.625.419.228.023.621.720.725.7-15.219.94.736.024.514.926.026.313.322.120.2-292.215.615.924.515.827.325.418.633.59.129.221.026.56.14.44.511.3-0.95.50.18.8
 us-gaap:NetIncomeLoss us-gaap:StatementEquityComponents us-gaap:RetainedEarnings▁█-22.44.5NA0.4-6.629.1NA25.419.228.023.621.720.725.7-15.219.94.736.024.514.926.026.313.322.120.2-292.215.615.924.515.827.325.418.633.59.129.221.026.54.94.44.511.3NANANANA
us-gaap:ShareBasedCompensation █▆▅▆▆▄▃▅█▅▄▆▆▆▇▇▇▆▆▆▆▅▅▅▆▄▃▂▅▄▂▃▄▅▁▃▃▅▃▃▃▃▁▂▃▃3.93.12.62.73.01.71.42.33.72.41.92.72.92.83.23.53.63.03.03.13.12.62.52.22.72.11.60.92.52.00.71.42.12.60.41.61.32.51.41.21.41.40.61.01.51.6
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:NetCashProvidedByUsedInInvestingActivities ▇▁▇▇▇▇▆▇▇▇█▆▇█▇▇▇▇▇▆▆▇▇▇▇█▇▇▇▇▇▆▇▇▇▆▇▇▇▇▇▆▇▇▇▇-9.3-626.6-14.7-5.128.118.6-72.5-11.6-18.71.031.0-75.8-4.780.6-11.2-30.8-4.921.4-47.9-143.8-78.8-5.9-24.7-15.5-12.172.7-33.217.0-38.19.6-36.0-89.621.9-9.7-23.0-88.9-8.2-1.8-8.9-9.8-8.2-89.4-4.0-12.4-12.2-17.8
us-gaap:PaymentsToAcquireProductiveAssets ▃▃▄▁▃▆▆▃▅▄▆▅▅▆▆▅█▄▆▅▅██▅▃▃▆▃▄▅▇▆▅▃▆▃▂▃▃▃▂▂▁▂▄▄8.99.114.75.410.721.119.510.816.313.621.017.316.119.719.416.424.914.818.715.116.425.924.715.511.611.319.89.514.715.423.421.016.79.318.48.87.99.09.68.87.96.24.08.212.813.9
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:NetCashProvidedByUsedInFinancingActivities ▆▃▃▃█▃▅▃▃▃▃▃▃▃▃▃▃▃▃▃▆▃▃▃▁▃▃▃▃▃▃▃▃▃▄▄▆▄▃▃▄▄▄▄▄▅148.1-14.5-11.3-11.2332.9-28.586.2-22.2-21.5-34.0-38.2-22.4-22.6-22.8-21.6-10.9-40.4-46.5-27.5-13.1152.6-17.2-35.3-16.8-195.4-36.9-21.8-11.3-17.5-20.6-40.2-9.2-30.8-22.0-4.9-5.3209.0-5.7-6.9-14.3-5.0-6.1-5.1-5.0-5.0100.5
us-gaap:PaymentsOfDividends ██▅▅▅▇▂▂▃▄▁▁▁▃11.711.710.69999999999999610.80000000000000410.611.39.69.79.910.29.29.29.310.0NA8.58.69.3NA8.18.18.2NANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:Dividends us-gaap:SubsequentEventType us-gaap:SubsequentEventNANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:PaymentsForRepurchaseOfCommonStock NANA0.00.00.012.53.612.010.118.528.813.013.25.712.82.331.832.619.75.12.26.34.13.713.228.215.45.011.012.734.44.025.214.70.00.00.00.00.0NANA0.00.0NANA44.2
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31

Weighted Average Number Of Diluted Shares Outstanding

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding


Weighted
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value151515151616161616161717171718181818181718181819181919191918180.0189518180.02002
Percentage of WeightedAverageNumberOfDilutedSharesOutstanding100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Weighted Average Number Of Shares Outstanding Basic

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic


Weighted
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value151515151515161616161616171717171717171717171718181919191918180.0189518180.02002
Percentage of WeightedAverageNumberOfSharesOutstandingBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount

us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount

us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount


Antidilutive
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-31
Value2262269710.0020.0070.0090.0040.00.0020.00.0030.0550.0660.0030.0020.050.00.00.840.0760.0640.035
Percentage of AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount100.0100.0100.0100.0100.0100.0100.0100.00.0100.00.0100.0100.0100.0100.0100.0100.00.00.0100.0100.0100.0100.0

Earnings Per Share Basic

us-gaap:EarningsPerShareBasic

us-gaap:EarningsPerShareBasic


Earnings
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-1.420.280.370.02-0.411.83-0.661.591.191.741.441.311.241.54-0.91.180.282.071.390.841.451.470.761.291.19-16.850.880.91.380.881.481.370.991.750.481.521.11.390.330.230.240.59-0.050.290.010.44
Percentage of EarningsPerShareBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Earnings Per Share Diluted

us-gaap:EarningsPerShareDiluted

us-gaap:EarningsPerShareDiluted


Earnings
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-1.420.280.370.02-0.411.81-0.661.571.181.711.411.291.221.51-0.91.160.272.041.370.821.431.440.731.211.11-16.850.850.851.330.851.441.340.981.730.471.511.091.380.330.230.240.59-0.050.290.010.44
Percentage of EarningsPerShareDiluted100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Comprehensive Income Net Of Tax

us-gaap:ComprehensiveIncomeNetOfTax

us-gaap:ComprehensiveIncomeNetOfTax


Comprehensive
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value-6.513218.65.313-6.024163714202717-19.2215.83716162627102220-225.3-64.11726162926193464302227-61.55.24.911
Percentage of ComprehensiveIncomeNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-0.94.20.03.41.93.7-1.66.54.39.53.75.36.54.5-5.46.51.610.55.05.08.07.93.36.65.6-60.6-19.05.17.75.09.58.16.110.320.69.06.57.6-19.41.61.43.5

Cost Of Goods And Services Sold

us-gaap:CostOfGoodsAndServicesSold

us-gaap:CostOfGoodsAndServicesSold


Cost
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value673262221208224286298298303315317323343316277256289262
Percentage of CostOfGoodsAndServicesSold100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax90.981.00.081.581.477.680.879.680.979.781.582.282.781.678.577.081.373.9

us-gaap:CostOfGoodsAndServicesSold us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship

us-gaap:CashFlowHedging


Cost
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value673262221208224286298298
Percentage of CostOfGoodsAndServicesSold100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax90.981.00.081.581.477.680.879.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:CashFlowHedging0.00.00.00.00.00.00.00.0

Costs And Expenses

us-gaap:CostsAndExpenses

us-gaap:CostsAndExpenses


Costs
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value729307253243271323359334342352352358380350313293344295286290277298281295330830311306297303269278288287290279305319304316323302253250278252
Percentage of CostsAndExpenses100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax98.594.80.095.298.387.797.489.191.489.190.591.191.690.488.788.096.883.386.490.782.786.988.988.089.9223.492.190.486.590.486.687.087.885.292.483.288.587.495.798.395.593.695.395.098.694.5

Gains Losses On Extinguishment Of Debt

us-gaap:GainsLossesOnExtinguishmentOfDebt

us-gaap:GainsLossesOnExtinguishmentOfDebt


Gains
Period End2021-06-302017-12-312017-09-302017-06-302016-12-312016-09-302016-06-302015-12-312015-09-302015-06-30
Value-35900000.000000-11100000.0000
Percentage of GainsLossesOnExtinguishmentOfDebt100.00.00.00.00.00.0100.00.00.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-4.80.00.00.00.00.0-3.30.00.00.0

us-gaap:GainsLossesOnExtinguishmentOfDebt us-gaap:DebtInstrument, us-gaap:LongtermDebtType

kalu:SeniorNotesDueTwoThousandAndTwentyFive, us-gaap:SeniorNotes


Gains
Period End2021-05-21
Value-35900000.0
Percentage of GainsLossesOnExtinguishmentOfDebt0.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax kalu:SeniorNotesDueTwoThousandAndTwentyFive us-gaap:SeniorNotes0.0

Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-37.94.25.7-0.3-5.338-18.03426373029283135366.95439244141293432-468.0172539253535304115473442105.17.6176.35.91.215
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-5.11.30.0-0.1-1.910.5-4.99.17.19.67.77.66.98.110.110.81.915.312.07.612.512.19.310.38.8-125.95.37.411.37.511.411.29.212.44.814.19.911.73.41.62.25.52.42.20.45.6

Income Tax Expense Benefit

us-gaap:IncomeTaxExpenseBenefit

us-gaap:IncomeTaxExpenseBenefit


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-15.5-0.3-0.2-0.71.39.6-7.48.77.39.86.48.27.85.950162.218159.41515161212-175.82.29.2149.48.210118.26.11813166.00.73.16.46.60.41.16.2
Percentage of IncomeTaxExpenseBenefit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-2.1-0.10.0-0.30.52.6-2.02.31.92.51.62.11.91.514.44.80.65.24.62.94.74.45.13.73.3-47.30.72.74.22.82.63.23.62.41.95.43.84.51.90.20.92.02.50.20.42.3

Income Taxes Paid

us-gaap:IncomeTaxesPaid

us-gaap:IncomeTaxesPaid


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value1.40.40.50.10.30.11.90.52.20.90.30.42.70.20.50.30.30.20.30.10.50.30.40.30.61.00.81.60.40.70.30.50.60.70.90.40.30.22.10.40.90.10.50.0
Percentage of IncomeTaxesPaid100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.20.10.00.00.10.00.50.10.60.20.10.10.60.10.10.10.10.10.10.00.10.10.10.10.20.30.20.50.10.20.10.20.20.20.30.10.10.10.70.10.30.00.20.0

us-gaap:IncomeTaxesPaid us-gaap:StatementGeographical

country:US


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-31
Value1.10.10.30.10.30.01.50.11.80.10.30.40.70.20.50.30.30.10.10.20.10.10.20.11.40.10.1
Percentage of IncomeTaxesPaid78.625.060.0100.0100.00.078.920.081.811.1100.0100.025.9100.0100.0100.0100.050.0100.040.033.333.333.310.087.525.014.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.10.00.00.00.10.00.40.00.50.00.10.10.20.10.10.10.10.00.00.10.00.00.10.00.40.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax country:US0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:NonUs


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value0.30.30.20.00.00.10.40.40.4
Percentage of IncomeTaxesPaid21.475.040.00.00.0100.021.180.018.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.00.10.00.00.00.00.10.10.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:NonUs0.00.00.00.00.00.00.00.00.0

Interest Expense

us-gaap:InterestExpense

us-gaap:InterestExpense


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value12121212106.17.35.85.85.75.75.75.75.65.85.35.55.65.65.55.53.74.24.95.29.89.89.79.28.88.68.89.09.39.39.26.54.14.84.34.44.54.63.73.50.0
Percentage of InterestExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.73.80.04.73.81.72.01.51.51.41.51.51.41.41.61.61.51.61.71.71.61.11.31.51.42.62.92.92.72.62.82.82.72.83.02.71.91.11.51.31.31.41.71.41.20.0

Interest Expense Debt

us-gaap:InterestExpenseDebt us-gaap:DebtInstrument, us-gaap:LongtermDebtType

us-gaap:InterestExpenseDebt

kalu:SeniorNotesDueTwoThousandAndTwentyFive, us-gaap:SeniorNotes


Interest
Period End2021-05-21
Value1.3
Percentage of InterestExpenseDebt100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax kalu:SeniorNotesDueTwoThousandAndTwentyFive us-gaap:SeniorNotes0.0

Interest Expense Long Term Debt

us-gaap:InterestExpenseLongTermDebt us-gaap:DebtInstrument, us-gaap:LongtermDebtType

us-gaap:InterestExpenseLongTermDebt

kalu:SeniorNotesDueTwoThousandAndTwentyFive, us-gaap:SeniorNotes


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-30
Value3.26.06.06.04.2
Percentage of InterestExpenseLongTermDebt100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.41.90.02.31.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax kalu:SeniorNotesDueTwoThousandAndTwentyFive us-gaap:SeniorNotes0.00.00.00.00.0

kalu:UnsecuredSeniorNotesDueJuneOneTwoThousandAndThirtyOne, us-gaap:SeniorNotes


Interest
Period End2021-06-30
Value2.9
Percentage of InterestExpenseLongTermDebt90.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax kalu:UnsecuredSeniorNotesDueJuneOneTwoThousandAndThirtyOne us-gaap:SeniorNotes0.0

Interest Paid Net

us-gaap:InterestPaidNet

us-gaap:InterestPaidNet


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value121111110.06.113-0.1100.311-0.1100.3
Percentage of InterestPaidNet100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.73.60.04.50.01.73.5-0.02.80.12.8-0.02.50.1

Net Income Loss

us-gaap:NetIncomeLoss

us-gaap:NetIncomeLoss


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-22.44.55.90.4-6.629-10.625192823212025-15.2194.73624142626132220-292.215152415272518339.12921266.14.44.511-0.95.50.18.8
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-3.01.40.00.2-2.47.9-2.96.85.17.16.15.55.06.6-4.36.01.310.17.44.67.87.74.26.65.5-78.64.64.77.14.78.87.95.79.92.98.76.17.31.91.41.33.5-0.32.10.03.3

us-gaap:NetIncomeLoss us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings


Net
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value-22.44.50.4-6.62925192823212025-15.2194.73624142626132220-292.215152415272518339.12921264.94.44.511
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.080.3100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-3.01.40.2-2.47.96.85.17.16.15.55.06.6-4.36.01.310.17.44.67.87.74.26.65.5-78.64.64.77.14.78.87.95.79.92.98.76.17.31.51.41.33.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Nonoperating Income Expense

us-gaap:NonoperatingIncomeExpense

us-gaap:NonoperatingIncomeExpense


Nonoperating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value-36600000.0-400000.0-600000.0-500000.0500000.0-800000.0-20300000.0-800000.0-100000.0
Percentage of NonoperatingIncomeExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-4.9-0.10.0-0.20.2-0.2-5.5-0.2-0.0

Operating Income Loss

us-gaap:OperatingIncomeLoss

us-gaap:OperatingIncomeLoss


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value111618124.7459.6403243363434374039115945295744354037-458.6263246324141405023563946155.5152011134.014
Percentage of OperatingIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.55.20.04.81.712.32.610.98.610.99.58.98.49.611.312.03.216.713.69.317.313.111.112.010.1-123.47.99.613.59.613.413.012.214.87.616.811.512.64.91.74.56.44.45.01.45.5

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

us-gaap:OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax

us-gaap:OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax


Other
Period End2021-06-302021-03-312020-12-312020-09-302015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-30
Value0-100000.00100000.0400000.0-300000.00100000.0200000.0100000.0-100000.0200000.0-300000.0-300000.0400000.0400000.0200000.0-500000.0400000.0-300000.0-300000.0800000.0
Percentage of OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax0.0100.00.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.0-0.00.00.00.1-0.10.00.00.10.0-0.00.1-0.1-0.10.10.10.1-0.10.1-0.1-0.10.2

Other Nonoperating Income Expense

us-gaap:OtherNonoperatingIncomeExpense

us-gaap:OtherNonoperatingIncomeExpense


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-36600000.0-400000.0-600000.0-500000.0500000.0-800000.0-20300000.0-800000.0-100000.0500000.0-1200000.0700000.0-500000.0100000.01400000.01500000.01000000.0600000.0100000.00-10700000.0300000.0-1700000.0-900000.0400000.0400000.0800000.02200000.01800000.01900000.02500000.02900000.0-800000.01000000.0600000.0400000.01100000.0700000.02100000.03900000.0-3400000.01700000.0-1500000.0-3600000.0700000.0200000.0
Percentage of OtherNonoperatingIncomeExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-4.9-0.10.0-0.20.2-0.2-5.5-0.2-0.00.1-0.30.2-0.10.00.40.50.30.20.00.0-3.20.1-0.5-0.30.10.10.20.60.50.60.80.9-0.20.30.20.10.30.20.71.2-1.00.5-0.6-1.40.20.1

us-gaap:OtherNonoperatingIncomeExpense us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship

us-gaap:FairValueHedging


Other
Period End2020-12-312020-09-302019-09-30
Value-2200000.0500000.0800000.0
Percentage of OtherNonoperatingIncomeExpense366.7-100.0-100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.00.20.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:FairValueHedging0.00.00.0

Revenue From Contract With Customer Excluding Assessed Tax

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value741324272255275369368374375395389393415388353332356355331320334343316336367371338338344335311319328337314335345365317322338322265263282267
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ProductOrService

kalu:AeroHsProducts


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302016-12-312016-09-302015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-30
Value13311196100144196216198189198198185185170170150174156164170181180177172173163168163165179171167
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax18.134.535.439.552.453.158.753.150.550.251.047.244.543.948.345.152.648.751.850.549.348.552.450.950.348.854.151.250.253.254.650.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax18.134.535.439.552.453.158.753.150.550.251.047.244.543.948.345.152.648.751.850.549.348.552.450.950.348.854.151.250.253.254.650.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax kalu:AeroHsProducts100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

kalu:AutomotiveExtrusions


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302016-12-312016-09-302015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-30
Value5557514616474447455355566760555245464549535044444440333331302829
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax7.517.818.818.16.112.812.112.712.113.414.214.316.215.615.815.813.614.514.514.714.613.513.013.013.012.210.910.69.49.19.08.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax7.517.818.818.16.112.812.112.712.113.414.214.316.215.615.815.813.614.514.514.714.613.513.013.013.012.210.910.69.49.19.08.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax kalu:AutomotiveExtrusions100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

kalu:GeProducts


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302016-12-312016-09-302015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-30
Value18015012110511012110411712813012013314714311511510110594100112119961031071129210211010593115
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax24.446.444.641.140.233.028.431.234.232.931.034.135.636.932.634.830.732.929.929.830.532.028.530.631.233.529.632.133.531.429.834.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax24.446.444.641.140.233.028.431.234.232.931.034.135.636.932.634.830.732.929.929.830.532.028.530.631.233.529.632.133.531.429.834.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax kalu:GeProducts100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

kalu:OtherProducts


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302016-12-312016-09-302015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-30
Value114.33.33.53.64.23.011121314171514111410121216202220181918161922212022
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.61.31.21.41.31.10.83.03.33.53.74.43.73.63.34.23.13.93.84.95.66.06.05.55.65.55.46.16.96.36.56.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.61.31.21.41.31.10.83.03.33.53.74.43.73.63.34.23.13.93.84.95.66.06.05.55.65.55.46.16.96.36.56.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax kalu:OtherProducts100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

kalu:Packaging


Revenue
Period End2021-06-30
Value358
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax48.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax48.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax kalu:Packaging100.0

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:TimingOfTransferOfGoodOrService

us-gaap:TransferredAtPointInTime


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value605200158151164215488115131131487127140156
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax81.761.858.459.459.758.4132.430.934.933.4125.232.533.940.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax81.761.858.459.459.758.4132.430.934.933.4125.232.533.940.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:TransferredAtPointInTime100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:TransferredOverTime


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value135123113103111153-119.5259244263-98.1265274231
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax18.338.241.640.640.341.6-32.469.165.166.6-25.267.566.159.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax18.338.241.640.640.341.6-32.469.165.166.6-25.267.566.159.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:TransferredOverTime100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Revenues

us-gaap:Revenues

us-gaap:Revenues


Revenues
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value741324272255275369368374375395389393415388353332356355331320334343316336367371338338344335311319328337314335345365317322338322265263282267
Percentage of Revenues100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:Revenues us-gaap:ProductOrService

kalu:AeroHsProducts


Revenuesus-gaap:
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302016-12-312016-09-302015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-30
Value100144196198189198198185185170170150174156164170181180177172173163168163165179171167
Percentage of Revenues39.552.453.153.150.550.251.047.244.543.948.345.152.648.751.850.549.348.552.450.950.348.854.151.250.253.254.650.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax39.552.453.153.150.550.251.047.244.543.948.345.152.648.751.850.549.348.552.450.950.348.854.151.250.253.254.650.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax kalu:AeroHsProducts100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

kalu:AutomotiveExtrusions


Revenuesus-gaap:
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302016-12-312016-09-302015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-30
Value46164747455355566760555245464549535044444440333331302829
Percentage of Revenues18.16.112.812.712.113.414.214.316.215.615.815.813.614.514.514.714.613.513.013.013.012.210.910.69.49.19.08.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax18.16.112.812.712.113.414.214.316.215.615.815.813.614.514.514.714.613.513.013.013.012.210.910.69.49.19.08.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax kalu:AutomotiveExtrusions100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

kalu:GeProducts


Revenuesus-gaap:
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302016-12-312016-09-302015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-30
Value10511012111712813012013314714311511510110594100112119961031071129210211010593115
Percentage of Revenues41.140.233.031.234.232.931.034.135.636.932.634.830.732.929.929.830.532.028.530.631.233.529.632.133.531.429.834.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax41.140.233.031.234.232.931.034.135.636.932.634.830.732.929.929.830.532.028.530.631.233.529.632.133.531.429.834.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax kalu:GeProducts100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

kalu:OtherProducts


Revenuesus-gaap:
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302016-12-312016-09-302015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-30
Value3.53.64.211121314171514111410121216202220181918161922212022
Percentage of Revenues1.41.31.13.03.33.53.74.43.73.63.34.23.13.93.84.95.66.06.05.55.65.55.46.16.96.36.56.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.41.31.13.03.33.53.74.43.73.63.34.23.13.93.84.95.66.06.05.55.65.55.46.16.96.36.56.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax kalu:OtherProducts100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:Revenues us-gaap:TimingOfTransferOfGoodOrService

us-gaap:TransferredAtPointInTime


Revenuesus-gaap:
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value151164215115131131117127140156
Percentage of Revenues59.459.758.430.934.933.430.332.533.940.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax59.459.758.430.934.933.430.332.533.940.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:TransferredAtPointInTime100.0100.0100.0100.0100.0100.024.2100.0100.0100.0

us-gaap:TransferredOverTime


Revenuesus-gaap:
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value103111153259244263271265274231
Percentage of Revenues40.640.341.669.165.166.669.767.566.159.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax40.640.341.669.165.166.669.767.566.159.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:TransferredOverTime100.0100.0100.0100.0100.0100.0-276.9100.0100.0100.0

Assets

us-gaap:Assets

us-gaap:Assets


Assets
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value24142152186418471848155315261426142214471419142614231405138514221386141314431433142112361250126312511534174318161772176617701792173917641752169416611390132013811419137013421085
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Liabilities

us-gaap:Liabilities

us-gaap:Liabilities


Liabilities
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value16931417113211271129832792674675699678663662651638639617614638619613448475490492780727715678683686696662679681684677453447419458445430184
Percentage of Liabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets70.265.960.761.161.153.651.947.347.548.347.846.546.646.446.144.944.643.544.343.243.136.338.138.939.450.941.739.438.338.738.838.938.138.538.940.440.832.633.930.332.332.532.017.0

Liabilities And Stockholders Equity

us-gaap:LiabilitiesAndStockholdersEquity

us-gaap:LiabilitiesAndStockholdersEquity


Liabilities
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value24142152186418471848155315261426142214471419142614231405138514221386141314431433142112361250126312511534174318161772176617701792173917641752169416611390132013811419137013421085
Percentage of LiabilitiesAndStockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Stockholders Equity

us-gaap:StockholdersEquity

us-gaap:StockholdersEquity


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-312008-12-312007-12-31
Value7207357327197187217337517467477407627617537467837687988048148087877747727587541015110010931082108410951076108410701010983937872962960925912901788942
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets29.834.139.338.938.946.448.152.752.551.752.253.553.453.653.955.155.456.555.756.856.963.761.961.160.649.158.360.661.761.361.261.161.961.561.159.659.267.466.169.767.767.568.083.00.00.0

us-gaap:StockholdersEquity us-gaap:StatementEquityComponents

us-gaap:AccumulatedDefinedBenefitPlansAdjustment


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312014-12-312013-12-31
Value-18.4-19.1-19.8-30.4-31.2-32.1-33.2-32.2-33.4-34.5-35.6-35.0-36.1-37.3-38.5-34.6-35.4-36.2-37.1-29.1-29.8-30.5-31.3-96.4-20.8
Percentage of StockholdersEquity-2.6-2.6-2.7-4.2-4.3-4.5-4.5-4.3-4.5-4.6-4.8-4.6-4.7-4.9-5.2-4.4-4.6-4.5-4.6-3.6-3.7-3.9-4.0-9.5-1.9
Percentage of Assets-0.8-0.9-1.1-1.6-1.7-2.1-2.2-2.3-2.3-2.4-2.5-2.5-2.5-2.7-2.8-2.4-2.6-2.6-2.6-2.0-2.1-2.5-2.5-5.5-1.2
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
Value249.61.1-3.4-10.7-21.5-5.6-11.0-8.8-4.6-13.40.5
Percentage of StockholdersEquity3.41.30.2-0.5-1.5-3.0-0.8-1.5-1.2-0.6-1.80.1
Percentage of Assets1.00.40.1-0.2-0.6-1.4-0.4-0.8-0.6-0.3-0.90.0
Percentage of Assets us-gaap:AccumulatedGainLossNetCashFlowHedgeParent0.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss


Stockholders
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312014-12-312013-12-31
Value-0.2-0.20.10.30.10.00.10.30.40.60.71.31.41.10.90.80.50.2-0.1-0.10.20.4
Percentage of StockholdersEquity-0.0-0.00.00.00.00.00.00.00.10.10.10.20.20.10.10.10.10.0-0.0-0.00.00.0
Percentage of Assets-0.0-0.00.00.00.00.00.00.00.00.00.00.10.10.10.10.10.00.0-0.0-0.00.00.0
Percentage of Assets us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedOtherComprehensiveIncome


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-312008-12-312007-12-31
Value6.3-9.6-18.7-34.0-42.2-54.1-38.6-43.2-42.3-39.1-48.8-39.8-39.0-45.4-36.7-32.7-34.3-35.4-36.7-28.8-29.9-30.8-31.7-28.7-28.8-29.2-96.1-16.4-17.7-19.8-20.7-22.9-23.5-24.8-26.0-81.5-82.4-83.9-85.01.81.41.41.7-7.3-60.3-6.0
Percentage of StockholdersEquity0.9-1.3-2.6-4.7-5.9-7.5-5.3-5.7-5.7-5.2-6.6-5.2-5.1-6.0-4.9-4.2-4.5-4.4-4.6-3.5-3.7-3.9-4.1-3.7-3.8-3.9-9.5-1.5-1.6-1.8-1.9-2.1-2.2-2.3-2.4-8.1-8.4-9.0-9.70.20.10.20.2-0.8-7.7-0.6
Percentage of Assets0.3-0.4-1.0-1.8-2.3-3.5-2.5-3.0-3.0-2.7-3.4-2.8-2.7-3.2-2.6-2.3-2.5-2.5-2.5-2.0-2.1-2.5-2.5-2.3-2.3-1.9-5.5-0.9-1.0-1.1-1.2-1.3-1.4-1.4-1.5-4.8-5.0-6.0-6.40.10.10.10.1-0.70.00.0
Percentage of Assets us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedTranslationAdjustment


Stockholders
Period End2021-06-302021-03-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-03-312016-12-312016-03-312015-12-312014-12-312013-12-31
Value-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.2-0.2-0.1-0.10.1-0.3
Percentage of StockholdersEquity-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.00.0-0.0
Percentage of Assets-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.00.0-0.0
Percentage of Assets us-gaap:AccumulatedTranslationAdjustment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AdditionalPaidInCapital


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-312008-12-312007-12-31
Value10731069106810661063106010621061105910561059105710541051105510521049104610471044104110371036103310311029102810261026102310231022102110181017101710151007998999997988987967958948
Percentage of StockholdersEquity148.9145.5145.9148.2147.9147.0144.8141.3141.9141.3143.1138.7138.6139.6141.5134.4136.5131.0130.2128.3128.8131.7133.8133.8135.9136.4101.293.393.894.694.493.494.893.995.0100.7103.2107.5114.4103.8103.9106.9108.2107.4121.6100.6
Percentage of Assets44.449.757.357.757.568.369.674.474.573.074.674.274.174.876.274.075.774.072.672.973.283.982.981.882.467.059.056.557.958.057.857.158.757.758.160.061.172.575.672.370.372.173.589.20.00.0
Percentage of Assets us-gaap:AdditionalPaidInCapital0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:RetainedEarnings


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-312008-12-312007-12-31
Value116151158163173190172193177168150135123111851099710175585134159.7-5.4-18.728027126124323321219117915114612210684868686808534116
Percentage of StockholdersEquity16.220.521.622.724.126.423.525.723.822.520.317.816.214.811.513.912.712.89.37.26.44.32.11.3-0.7-2.527.624.623.922.521.619.417.816.514.114.512.511.49.79.09.09.48.89.44.312.3
Percentage of Assets4.87.08.58.89.412.311.313.512.511.610.69.58.67.96.27.77.07.25.24.13.72.81.30.8-0.4-1.216.114.914.713.813.211.811.010.18.68.77.47.76.46.26.16.36.07.80.00.0
Percentage of Assets us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:TreasuryStock


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-312008-12-31
Value-475.9-475.9-475.9-475.9-475.9-475.9-463.4-460.1-448.1-437.9-420.5-390.9-378.0-364.7-358.6-345.7-344.0-314.1-281.4-260.3-255.1-252.9-246.5-242.5-238.6-227.1-197.1-181.1-176.2-164.9-152.2-116.8-112.8-88.5-72.3-72.3-72.3-72.3-72.3-72.3-72.3-72.3-72.3-28.1-28.1
Percentage of StockholdersEquity-66.0-64.7-65.0-66.2-66.2-66.0-63.1-61.2-60.0-58.6-56.8-51.3-49.7-48.4-48.1-44.1-44.7-39.3-35.0-32.0-31.6-32.1-31.8-31.4-31.4-30.1-19.4-16.5-16.1-15.2-14.0-10.7-10.5-8.2-6.8-7.2-7.4-7.7-8.3-7.5-7.5-7.8-7.9-3.1-3.6
Percentage of Assets-19.7-22.1-25.5-25.8-25.7-30.6-30.4-32.3-31.5-30.2-29.6-27.4-26.5-25.9-25.9-24.3-24.8-22.2-19.5-18.2-17.9-20.5-19.7-19.2-19.1-14.8-11.3-10.0-9.9-9.3-8.6-6.5-6.5-5.0-4.1-4.3-4.4-5.2-5.5-5.2-5.1-5.3-5.4-2.60.0
Percentage of Assets us-gaap:TreasuryStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Assets Current

us-gaap:AssetsCurrent

us-gaap:AssetsCurrent


Assets
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value1200930112111091107806779668649671656673704682656662615636655657640447501564546823825822769677690752736757741755722482434408439433471300
Percentage of AssetsCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets49.743.260.160.159.951.951.146.945.746.446.347.249.548.547.446.644.445.045.445.945.036.240.144.743.753.647.345.343.438.339.042.042.342.942.344.643.534.732.929.531.031.635.127.7

Cash

us-gaap:Cash

us-gaap:Cash


Cash
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302011-12-31
Value780750710199282932292223181723173023372650344037422042969685789788210713549
Percentage of Cash100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets41.840.638.412.91.82.12.32.01.61.61.31.21.71.22.21.72.61.93.62.83.22.93.413.31.73.93.93.35.04.54.76.28.03.8

Cash And Cash Equivalents At Carrying Value

us-gaap:CashAndCashEquivalentsAtCarryingValue

us-gaap:CashAndCashEquivalentsAtCarryingValue


Cash
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-312007-12-31
Value28312878075071030726417212211512594164135517357345572195707282542201772121741851692242812482732553177749235955135143134135300.268
Percentage of CashAndCashEquivalentsAtCarryingValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets11.75.941.840.638.419.817.312.18.68.08.86.611.59.63.75.24.12.43.85.113.75.75.86.54.314.410.211.79.810.59.612.516.214.115.615.119.15.63.81.74.24.110.10.00.00.02.80.00.0

Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents


Cash
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302015-12-312014-12-31
Value29614179476472432127818613612913910917814864877046678483188
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets12.36.642.641.439.220.718.313.19.68.99.87.712.610.54.66.15.13.34.75.96.710.8

Accounts Receivable Net Current

us-gaap:AccountsReceivableNetCurrent

us-gaap:AccountsReceivableNetCurrent


Accounts
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value389305112119126175167188178195179194191185165138145157137142134138116131138149129132123123119122122141123156131130981291191148383
Percentage of AccountsReceivableNetCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets16.114.26.06.46.811.310.913.212.513.512.713.613.413.211.99.710.511.19.59.99.511.29.310.411.19.87.47.36.97.06.86.87.18.07.19.27.99.47.59.38.48.36.27.7

Inventory Net

us-gaap:InventoryNet

us-gaap:InventoryNet


Inventory
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value383385152157181194177192231233215196177176207212199203201223217210219217217218214211198203214207202199186189196198205194178169167125
Percentage of InventoryNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets15.917.98.28.59.812.511.613.516.316.215.213.812.412.615.014.914.414.414.015.615.317.017.617.217.414.212.311.611.211.512.111.611.711.310.611.211.814.315.614.112.612.412.511.5

Inventory Finished Goods

us-gaap:InventoryFinishedGoods

us-gaap:InventoryFinishedGoods


Inventory
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value598337334043424144474841364063646068737065667963646973646065726861615960626775615553
Percentage of InventoryFinishedGoods100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets2.53.92.01.82.22.82.82.93.13.33.42.92.62.94.64.64.44.85.14.94.65.46.45.05.24.54.23.63.43.74.13.83.53.53.43.63.74.95.74.53.94.0

Inventory L I F O Reserve

us-gaap:InventoryLIFOReserve

us-gaap:InventoryLIFOReserve


Inventory
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302010-12-31
Value8.4113124-8.5-24.1370.4112024152126294936
Percentage of InventoryLIFOReserve100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.50.82.21.8-0.6-1.92.20.00.71.21.40.91.31.92.23.62.7

Prepaid Expense And Other Assets Current

us-gaap:PrepaidExpenseAndOtherAssetsCurrent

us-gaap:PrepaidExpenseAndOtherAssetsCurrent


Prepaid
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value5935282525201918212318242925333126341810129.1569810019517815613548446770717073747578587880
Percentage of PrepaidExpenseAndOtherAssetsCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets2.51.71.51.41.41.31.31.31.51.61.31.72.01.82.42.21.92.41.30.80.90.74.57.88.012.810.28.67.62.82.53.84.04.04.04.34.55.46.04.35.66.0

Land

us-gaap:Land

us-gaap:Land


Land
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value262621212120212121212121212121222222222222222222222222222222222222222222222222232323
Percentage of Land100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.11.21.21.21.21.31.41.51.51.51.51.51.51.51.51.61.61.61.61.61.61.81.81.81.81.51.31.31.31.31.31.31.31.31.31.31.41.61.71.71.61.7

Machinery And Equipment Gross

us-gaap:MachineryAndEquipmentGross

us-gaap:MachineryAndEquipmentGross


Machinery
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value11061144847836826821813797783766755736719698689675625620615585573559549528523518509500491455425416406403400391379362356351346338
Percentage of MachineryAndEquipmentGross100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets45.853.245.445.344.752.953.355.955.153.053.251.650.549.749.747.445.143.942.640.840.445.243.941.841.833.729.227.527.725.824.023.223.422.922.823.122.826.127.025.524.425.2

Noncurrent Assets

us-gaap:NoncurrentAssets

us-gaap:NoncurrentAssets


Noncurrent
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value627622611571530495454429384367354
Percentage of NoncurrentAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets33.640.843.141.336.839.626.124.221.927.926.4

us-gaap:NoncurrentAssets us-gaap:StatementGeographical

country:US


Noncurrent
Period End2020-12-312019-12-312018-12-312017-12-31
Value597592581541
Percentage of NoncurrentAssets95.395.395.194.7
Percentage of Assets32.038.841.039.1
Percentage of Assets country:US0.00.00.00.0

us-gaap:NonUs


Noncurrent
Period End2020-12-312019-12-312018-12-31
Value292930
Percentage of NoncurrentAssets4.74.74.9
Percentage of Assets1.61.92.1
Percentage of Assets us-gaap:NonUs0.00.00.0

Property Plant And Equipment Gross

us-gaap:PropertyPlantAndEquipmentGross

us-gaap:PropertyPlantAndEquipmentGross


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
Value13831416102310071000992972953941927917892870854837815800774761740725709692661646632621603593581567541522503494474466458449439430412
Percentage of PropertyPlantAndEquipmentGross100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets57.365.854.954.654.163.963.766.966.264.164.762.661.160.860.557.357.754.852.751.651.157.455.452.451.641.235.733.233.532.932.030.230.028.528.228.028.133.034.031.830.330.7

Construction In Progress Gross

us-gaap:ConstructionInProgressGross

us-gaap:ConstructionInProgressGross


Construction
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value74683738424433353841433836423527624234474554484236272518244966504125209.815232418147.7
Percentage of ConstructionInProgressGross100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets3.13.22.02.12.32.82.22.52.72.93.12.72.63.12.52.04.53.02.43.33.24.43.93.42.91.81.41.01.42.83.72.82.41.51.20.60.91.71.81.31.00.6

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
Value433411398386375364352341329318307298288277267258248239230221213205196189181174166160152144137131124118111105989286817563
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 Assets18.019.121.420.920.323.423.123.923.222.021.720.920.219.819.318.117.916.916.015.515.016.615.815.014.511.49.68.88.68.27.87.37.26.76.46.26.06.76.65.95.34.8

Amortization Of Intangible Assets

us-gaap:AmortizationOfIntangibleAssets

us-gaap:AmortizationOfIntangibleAssets


Amortization
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-03-312010-03-31
Value2900000.0700000.0800000.0700000.0700000.0700000.0700000.0700000.0700000.0700000.0700000.0400000.0300000.0400000.0400000.0300000.0300000.0400000.0300000.0400000.0400000.0400000.0400000.0400000.0400000.0400000.0400000.0400000.0400000.0400000.0400000.0400000.0500000.0400000.0500000.0400000.0500000.0400000.0600000.0500000.0600000.00
Percentage of AmortizationOfIntangibleAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Property Plant And Equipment Net

us-gaap:PropertyPlantAndEquipmentNet

us-gaap:PropertyPlantAndEquipmentNet


Property
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value9511006627622627630622614613610611595584578571557552535530518512504495472464458454442441436429411398386384374373370367363360358354338
Percentage of PropertyPlantAndEquipmentNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets39.446.833.633.733.940.640.843.143.242.243.141.841.041.241.339.239.837.936.836.236.140.839.637.437.129.826.124.424.924.724.223.022.921.921.922.122.526.727.926.325.426.126.431.2

Goodwill

us-gaap:Goodwill

us-gaap:Goodwill


Goodwill
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-31
Value3946181818181844444444431818181818373737373737373737373737373737373737373737373737373.1
Percentage of Goodwill100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.62.11.01.01.01.21.23.13.13.03.13.01.31.31.41.31.42.62.62.62.63.03.02.93.02.42.12.02.12.12.12.12.12.12.12.22.22.72.82.72.62.70.2

us-gaap:Goodwill us-gaap:BusinessAcquisition

kalu:AlcoaWarrickLLC


Goodwillus-gaap:
Period End2021-06-302021-03-31
Value2027
Percentage of Goodwill52.259.3
Percentage of Assets0.81.3
Percentage of Assets kalu:AlcoaWarrickLLC0.00.0

us-gaap:Goodwill us-gaap:Restatement, us-gaap:BusinessAcquisition

srt:RestatementAdjustment, kalu:AlcoaWarrickLLC


Goodwillus-gaap:
Period End2021-06-30
Value-6.9
Percentage of Goodwill-17.6
Percentage of Assets-0.3
Percentage of Assets srt:RestatementAdjustment kalu:AlcoaWarrickLLC0.0

Finite Lived Intangible Assets Net

us-gaap:FiniteLivedIntangibleAssetsNet

us-gaap:FiniteLivedIntangibleAssetsNet


Finite
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-31
Value7982262728282930313132332424252525262626293030303131323232333334343535353636373738384.0
Percentage of FiniteLivedIntangibleAssetsNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets3.33.81.41.51.51.91.92.12.22.22.32.31.71.81.81.81.91.81.81.92.12.42.42.42.52.11.81.81.91.91.91.92.02.02.02.12.22.62.82.72.72.80.3

us-gaap:FiniteLivedIntangibleAssetsNet us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:CustomerRelationships


Finite
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value2123252526303233353536363637373.7
Percentage of FiniteLivedIntangibleAssetsNet82.079.177.2100.0100.0100.0100.0100.099.799.499.299.298.998.498.292.5
Percentage of Assets1.21.51.81.81.82.41.81.92.02.12.22.62.82.72.60.3
Percentage of Assets us-gaap:CustomerRelationships0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:NoncompeteAgreements


Finite
Period End2020-12-312019-12-312018-12-31
Value3.04.15.1
Percentage of FiniteLivedIntangibleAssetsNet11.213.915.7
Percentage of Assets0.20.30.4
Percentage of Assets us-gaap:NoncompeteAgreements0.00.00.0

us-gaap:TradeNames


Finite
Period End2020-12-312019-12-312018-12-31
Value1.82.12.3
Percentage of FiniteLivedIntangibleAssetsNet6.77.17.1
Percentage of Assets0.10.10.2
Percentage of Assets us-gaap:TradeNames0.00.00.0

Operating Lease Right Of Use Asset

us-gaap:OperatingLeaseRightOfUseAsset

us-gaap:OperatingLeaseRightOfUseAsset


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value393826272828252626270.0
Percentage of OperatingLeaseRightOfUseAsset100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0
Percentage of Assets1.61.81.41.51.51.91.71.81.91.90.0

Other Assets Noncurrent

us-gaap:OtherAssetsNoncurrent

us-gaap:OtherAssetsNoncurrent


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value10247444138373836414038394037413936373322201922222323232324108104109788886847363726480748341
Percentage of OtherAssetsNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets4.22.22.42.22.12.42.52.62.92.82.72.72.82.73.02.82.62.62.31.51.51.61.81.71.81.51.31.31.46.15.96.14.55.04.95.04.44.55.54.75.75.46.23.8

Accounts Payable Current

us-gaap:AccountsPayableCurrent

us-gaap:AccountsPayableCurrent


Accounts
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value3442598663611139293101124121120132120909484847569727076697783818972726271737362666665626273635049
Percentage of AccountsPayableCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets14.312.14.63.43.37.36.06.67.18.68.68.49.38.66.56.66.16.05.34.95.15.76.15.56.25.44.74.94.14.13.64.04.24.13.63.94.04.74.74.55.24.63.84.5

Liabilities Current

us-gaap:LiabilitiesCurrent

us-gaap:LiabilitiesCurrent


Liabilities
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value439350158142150199170175178204205192194184173176156153165159153160169169163448426428389142150151147157161157162163149153164164142123
Percentage of LiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets18.216.38.57.78.112.811.212.312.614.114.513.513.613.112.512.411.310.911.411.110.813.013.513.413.129.224.523.621.98.18.58.48.58.99.29.39.811.811.311.111.612.010.611.3

Operating Lease Liability Current

us-gaap:OperatingLeaseLiabilityCurrent

us-gaap:OperatingLeaseLiabilityCurrent


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value8400000.08100000.04400000.04500000.04500000.04500000.03900000.03900000.03600000.03500000.0
Percentage of OperatingLeaseLiabilityCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.30.40.20.20.20.30.30.30.30.2

Other Accrued Liabilities Current

us-gaap:OtherAccruedLiabilitiesCurrent

us-gaap:OtherAccruedLiabilitiesCurrent


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value55584145545644504751443729354043374039464456526151157132131115374440393851414642414134424232
Percentage of OtherAccruedLiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets2.32.72.22.52.93.72.93.53.33.63.12.62.12.52.93.02.72.92.83.33.14.64.24.94.110.27.67.36.52.12.52.32.32.23.02.52.83.13.13.02.43.13.13.0

Taxes Payable Current

us-gaap:TaxesPayableCurrent

us-gaap:TaxesPayableCurrent


Taxes
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302011-12-31
Value9.9105.28.78.4106.28.07.89.96.58.27.2106.89.07.79.54.37.86.78.63.16.46.38.25.26.36.37.64.35.75.75.43.14.52.6
Percentage of TaxesPayableCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.40.50.30.50.50.70.40.60.50.70.50.60.50.80.50.60.60.70.30.50.50.70.20.50.50.50.30.30.40.40.20.30.30.30.20.30.2

Long Term Debt Noncurrent

us-gaap:LongTermDebtNoncurrent

us-gaap:LongTermDebtNoncurrent


Long
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value10358388388378374924923713703703703703703693693693693683683683681941972182252252252252253903883863843823803783763.03.43.77.67.9117.1
Percentage of LongTermDebtNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets42.939.044.945.345.331.732.326.026.125.626.126.026.026.326.726.026.626.125.525.725.915.815.817.318.014.712.912.412.722.121.921.622.121.721.722.322.70.20.30.30.50.60.90.7

Deferred Income Tax Liabilities Net

us-gaap:DeferredIncomeTaxLiabilitiesNet

us-gaap:DeferredIncomeTaxLiabilitiesNet


Deferred
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312018-12-31
Value4.615138.97.34.54.54.2
Percentage of DeferredIncomeTaxLiabilitiesNet100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.20.70.70.50.40.30.30.3

Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent

us-gaap:PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent

us-gaap:PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent


Pension
Period End2021-06-302021-03-312020-12-31
Value87851.3
Percentage of PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent100.0100.0100.0
Percentage of Assets3.63.90.1

Other Liabilities Noncurrent

us-gaap:OtherLiabilitiesNoncurrent

us-gaap:OtherLiabilitiesNoncurrent


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value757678807575672624236625242360202019733.43.43.2873.23.23.3582.82.92.71463.412713513412811811612611514113013453
Percentage of OtherLiabilitiesNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets3.13.54.24.34.14.84.41.81.71.64.71.81.71.74.31.51.51.45.10.20.20.37.00.30.30.23.30.20.20.28.30.27.37.77.77.67.18.49.58.410.09.510.04.9

Operating Lease Liability Noncurrent

us-gaap:OperatingLeaseLiabilityNoncurrent

us-gaap:OperatingLeaseLiabilityNoncurrent


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value343425262727252526260.0
Percentage of OperatingLeaseLiabilityNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0
Percentage of Assets1.41.61.41.41.51.81.71.81.81.80.0

Lessee Operating Lease Liability Payments Due Year Two

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo


Lessee
Period End2021-06-302021-03-312020-12-312020-09-30
Value8000000.07500000.05000000.04900000.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearTwo100.0100.0100.0100.0
Percentage of Assets0.30.30.30.3

Lessee Operating Lease Liability Payments Due Year Three

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree


Lessee
Period End2021-06-302021-03-312020-12-312020-09-30
Value7200000.06700000.04600000.04500000.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearThree100.0100.0100.0100.0
Percentage of Assets0.30.30.20.2

Lessee Operating Lease Liability Payments Due Year Four

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour


Lessee
Period End2021-06-302021-03-312020-12-312020-09-30
Value4000000.03600000.04200000.04100000.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearFour100.0100.0100.0100.0
Percentage of Assets0.20.20.20.2

Lessee Operating Lease Liability Payments Due Year Five

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive


Lessee
Period End2020-12-31
Value2300000.0
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
Value16
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive100.0
Percentage of Assets0.9

Operating Lease Liability

us-gaap:OperatingLeaseLiability

us-gaap:OperatingLeaseLiability


Operating
Period End2021-06-302021-03-312020-12-312020-09-30
Value42423030
Percentage of OperatingLeaseLiability100.0100.0100.0100.0
Percentage of Assets1.82.01.61.7

Lessee Operating Lease Liability Payments Due

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue


Lessee
Period End2021-06-302021-03-312020-12-312020-09-30
Value51513840
Percentage of LesseeOperatingLeaseLiabilityPaymentsDue100.0100.0100.0100.0
Percentage of Assets2.12.42.12.2

Lessee Operating Lease Liability Undiscounted Excess Amount

us-gaap:LesseeOperatingLeaseLiabilityUndiscountedExcessAmount

us-gaap:LesseeOperatingLeaseLiabilityUndiscountedExcessAmount


Lessee
Period End2021-06-302021-03-312020-12-312020-09-30
Value8500000.08800000.08900000.09300000.0
Percentage of LesseeOperatingLeaseLiabilityUndiscountedExcessAmount100.0100.0100.0100.0
Percentage of Assets0.40.40.50.5

Stockholders Equity

us-gaap:StockholdersEquity

us-gaap:StockholdersEquity


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-312008-12-312007-12-31
Value7207357327197187217337517467477407627617537467837687988048148087877747727587541015110010931082108410951076108410701010983937872962960925912901788942
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets29.834.139.338.938.946.448.152.752.551.752.253.553.453.653.955.155.456.555.756.856.963.761.961.160.649.158.360.661.761.361.261.161.961.561.159.659.267.466.169.767.767.568.083.00.00.0

us-gaap:StockholdersEquity us-gaap:StatementEquityComponents

us-gaap:AccumulatedDefinedBenefitPlansAdjustment


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312014-12-312013-12-31
Value-18.4-19.1-19.8-30.4-31.2-32.1-33.2-32.2-33.4-34.5-35.6-35.0-36.1-37.3-38.5-34.6-35.4-36.2-37.1-29.1-29.8-30.5-31.3-96.4-20.8
Percentage of StockholdersEquity-2.6-2.6-2.7-4.2-4.3-4.5-4.5-4.3-4.5-4.6-4.8-4.6-4.7-4.9-5.2-4.4-4.6-4.5-4.6-3.6-3.7-3.9-4.0-9.5-1.9
Percentage of Assets-0.8-0.9-1.1-1.6-1.7-2.1-2.2-2.3-2.3-2.4-2.5-2.5-2.5-2.7-2.8-2.4-2.6-2.6-2.6-2.0-2.1-2.5-2.5-5.5-1.2
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
Value249.61.1-3.4-10.7-21.5-5.6-11.0-8.8-4.6-13.40.5
Percentage of StockholdersEquity3.41.30.2-0.5-1.5-3.0-0.8-1.5-1.2-0.6-1.80.1
Percentage of Assets1.00.40.1-0.2-0.6-1.4-0.4-0.8-0.6-0.3-0.90.0
Percentage of Assets us-gaap:AccumulatedGainLossNetCashFlowHedgeParent0.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss


Stockholders
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312014-12-312013-12-31
Value-0.2-0.20.10.30.10.00.10.30.40.60.71.31.41.10.90.80.50.2-0.1-0.10.20.4
Percentage of StockholdersEquity-0.0-0.00.00.00.00.00.00.00.10.10.10.20.20.10.10.10.10.0-0.0-0.00.00.0
Percentage of Assets-0.0-0.00.00.00.00.00.00.00.00.00.00.10.10.10.10.10.00.0-0.0-0.00.00.0
Percentage of Assets us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedOtherComprehensiveIncome


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-312008-12-312007-12-31
Value6.3-9.6-18.7-34.0-42.2-54.1-38.6-43.2-42.3-39.1-48.8-39.8-39.0-45.4-36.7-32.7-34.3-35.4-36.7-28.8-29.9-30.8-31.7-28.7-28.8-29.2-96.1-16.4-17.7-19.8-20.7-22.9-23.5-24.8-26.0-81.5-82.4-83.9-85.01.81.41.41.7-7.3-60.3-6.0
Percentage of StockholdersEquity0.9-1.3-2.6-4.7-5.9-7.5-5.3-5.7-5.7-5.2-6.6-5.2-5.1-6.0-4.9-4.2-4.5-4.4-4.6-3.5-3.7-3.9-4.1-3.7-3.8-3.9-9.5-1.5-1.6-1.8-1.9-2.1-2.2-2.3-2.4-8.1-8.4-9.0-9.70.20.10.20.2-0.8-7.7-0.6
Percentage of Assets0.3-0.4-1.0-1.8-2.3-3.5-2.5-3.0-3.0-2.7-3.4-2.8-2.7-3.2-2.6-2.3-2.5-2.5-2.5-2.0-2.1-2.5-2.5-2.3-2.3-1.9-5.5-0.9-1.0-1.1-1.2-1.3-1.4-1.4-1.5-4.8-5.0-6.0-6.40.10.10.10.1-0.70.00.0
Percentage of Assets us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedTranslationAdjustment


Stockholders
Period End2021-06-302021-03-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-03-312016-12-312016-03-312015-12-312014-12-312013-12-31
Value-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.2-0.2-0.1-0.10.1-0.3
Percentage of StockholdersEquity-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.00.0-0.0
Percentage of Assets-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.00.0-0.0
Percentage of Assets us-gaap:AccumulatedTranslationAdjustment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AdditionalPaidInCapital


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-312008-12-312007-12-31
Value10731069106810661063106010621061105910561059105710541051105510521049104610471044104110371036103310311029102810261026102310231022102110181017101710151007998999997988987967958948
Percentage of StockholdersEquity148.9145.5145.9148.2147.9147.0144.8141.3141.9141.3143.1138.7138.6139.6141.5134.4136.5131.0130.2128.3128.8131.7133.8133.8135.9136.4101.293.393.894.694.493.494.893.995.0100.7103.2107.5114.4103.8103.9106.9108.2107.4121.6100.6
Percentage of Assets44.449.757.357.757.568.369.674.474.573.074.674.274.174.876.274.075.774.072.672.973.283.982.981.882.467.059.056.557.958.057.857.158.757.758.160.061.172.575.672.370.372.173.589.20.00.0
Percentage of Assets us-gaap:AdditionalPaidInCapital0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:RetainedEarnings


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-312008-12-312007-12-31
Value116151158163173190172193177168150135123111851099710175585134159.7-5.4-18.728027126124323321219117915114612210684868686808534116
Percentage of StockholdersEquity16.220.521.622.724.126.423.525.723.822.520.317.816.214.811.513.912.712.89.37.26.44.32.11.3-0.7-2.527.624.623.922.521.619.417.816.514.114.512.511.49.79.09.09.48.89.44.312.3
Percentage of Assets4.87.08.58.89.412.311.313.512.511.610.69.58.67.96.27.77.07.25.24.13.72.81.30.8-0.4-1.216.114.914.713.813.211.811.010.18.68.77.47.76.46.26.16.36.07.80.00.0
Percentage of Assets us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:TreasuryStock


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-312008-12-31
Value-475.9-475.9-475.9-475.9-475.9-475.9-463.4-460.1-448.1-437.9-420.5-390.9-378.0-364.7-358.6-345.7-344.0-314.1-281.4-260.3-255.1-252.9-246.5-242.5-238.6-227.1-197.1-181.1-176.2-164.9-152.2-116.8-112.8-88.5-72.3-72.3-72.3-72.3-72.3-72.3-72.3-72.3-72.3-28.1-28.1
Percentage of StockholdersEquity-66.0-64.7-65.0-66.2-66.2-66.0-63.1-61.2-60.0-58.6-56.8-51.3-49.7-48.4-48.1-44.1-44.7-39.3-35.0-32.0-31.6-32.1-31.8-31.4-31.4-30.1-19.4-16.5-16.1-15.2-14.0-10.7-10.5-8.2-6.8-7.2-7.4-7.7-8.3-7.5-7.5-7.8-7.9-3.1-3.6
Percentage of Assets-19.7-22.1-25.5-25.8-25.7-30.6-30.4-32.3-31.5-30.2-29.6-27.4-26.5-25.9-25.9-24.3-24.8-22.2-19.5-18.2-17.9-20.5-19.7-19.2-19.1-14.8-11.3-10.0-9.9-9.3-8.6-6.5-6.5-5.0-4.1-4.3-4.4-5.2-5.5-5.2-5.1-5.3-5.4-2.60.0
Percentage of Assets us-gaap:TreasuryStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Additional Paid In Capital Common Stock

us-gaap:AdditionalPaidInCapitalCommonStock

us-gaap:AdditionalPaidInCapitalCommonStock


Additional
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value10731069106810661063106010621061105910561059105710541051105510521049104610471044104110371036103310311029102810261026102310231022102110181017101710151007998999997988987967
Percentage of AdditionalPaidInCapitalCommonStock100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets44.449.757.357.757.568.369.674.474.573.074.674.274.174.876.274.075.774.072.672.973.283.982.981.882.467.059.056.557.958.057.857.158.757.758.160.061.172.575.672.370.372.173.589.2

Retained Earnings Accumulated Deficit

us-gaap:RetainedEarningsAccumulatedDeficit

us-gaap:RetainedEarningsAccumulatedDeficit


Retained
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value116151158163173190172193177168150135123111851099710175585134159.7-5.4-18.7280271261243233212191179151146122106848686868085
Percentage of RetainedEarningsAccumulatedDeficit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets4.87.08.58.89.412.311.313.512.511.610.69.58.67.96.27.77.07.25.24.13.72.81.30.8-0.4-1.216.114.914.713.813.211.811.010.18.68.77.47.76.46.26.16.36.07.8

Accumulated Other Comprehensive Income Loss Net Of Tax

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax


Accumulated
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value6300000.0-9600000.0-18700000.0-34000000.0-42200000.0-54100000.0-38600000.0-43200000.0-42300000.0-39100000.0-48800000.0-39800000.0-39000000.0-45400000.0-36700000.0-32700000.0-34300000.0-35400000.0-36700000.0-28800000.0-29900000.0-30800000.0-31700000.0-28700000.0-28800000.0-29200000.0-96100000.0-16400000.0-17700000.0-19800000.0-20700000.0-22900000.0-23500000.0-24800000.0-26000000.0-81500000.0-82400000.0-83900000.0-85000000.01800000.01400000.01400000.01700000.0-7300000.0
Percentage of AccumulatedOtherComprehensiveIncomeLossNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.3-0.4-1.0-1.8-2.3-3.5-2.5-3.0-3.0-2.7-3.4-2.8-2.7-3.2-2.6-2.3-2.5-2.5-2.5-2.0-2.1-2.5-2.5-2.3-2.3-1.9-5.5-0.9-1.0-1.1-1.2-1.3-1.4-1.4-1.5-4.8-5.0-6.0-6.40.10.10.10.1-0.7

Treasury Stock Value

us-gaap:TreasuryStockValue

us-gaap:TreasuryStockValue


Treasury
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value4754754754754754754634604484374203903783643583453443142812602552522462422382271971811761641521161128872727272727272727228
Percentage of TreasuryStockValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets19.722.125.525.825.730.630.432.331.530.229.627.426.525.925.924.324.822.219.518.217.920.519.719.219.114.811.310.09.99.38.66.56.55.04.14.34.45.25.55.25.15.35.42.6

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

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue


Adjustments
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value3.63.12.72.61.72.33.42.41.92.72.72.83.13.53.43.03.03.13.02.62.52.22.52.11.60.92.32.00.71.41.92.60.41.61.12.51.41.21.21.4
Percentage of AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
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

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital


Adjustments
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value3.63.12.72.61.72.33.42.41.92.72.72.83.13.53.43.03.03.13.02.62.52.22.52.11.60.92.32.00.71.41.92.60.41.61.12.51.41.21.21.4
Percentage of AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
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
Percentage of Assets us-gaap:AdditionalPaidInCapital0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Net Cash Provided By Used In Operating Activities

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInOperatingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-31
Value16-11.456554252788347223728572610.058694.1573450214960407.4203244272141426.34532393542-12.117151.0
Percentage of NetCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax2.2-3.520.721.815.414.221.322.212.75.89.77.313.96.72.817.519.41.217.410.815.26.215.818.011.12.06.09.612.88.16.813.013.01.914.69.511.59.613.2-3.85.04.90.4

Net Cash Provided By Used In Investing Activities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-9.3-626.6-14.7-5.12818-72.5-11.6-18.71.031-75.8-4.780-11.2-30.8-4.921-47.9-143.8-78.8-5.9-24.7-15.5-12.172-33.217-38.19.6-36.0-89.621-9.7-23.0-88.9-8.2-1.8-8.9-9.8-8.2-89.4-4.0-12.4-12.2-17.8
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-1.3-193.4-5.4-2.010.25.0-19.7-3.1-5.00.38.0-19.3-1.120.8-3.2-9.3-1.46.0-14.4-44.9-23.5-1.7-7.8-4.6-3.319.6-9.85.0-11.12.9-11.6-28.06.7-2.9-7.3-26.5-2.4-0.5-2.8-3.0-2.4-27.7-1.5-4.7-4.3-6.7

Net Cash Provided By Used In Financing Activities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value148-14.5-11.3-11.2332-28.586-22.2-21.5-34.0-38.2-22.4-22.6-22.8-21.6-10.9-40.4-46.5-27.5-13.1152-17.2-35.3-16.8-195.4-36.9-21.8-11.3-17.5-20.6-40.2-9.2-30.8-22.0-4.9-5.3209-5.7-6.9-14.3-5.0-6.1-5.1-5.0-5.0100
Percentage of NetCashProvidedByUsedInFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax20.0-4.5-4.2-4.4120.7-7.723.4-5.9-5.7-8.6-9.8-5.7-5.4-5.9-6.1-3.3-11.3-13.1-8.3-4.145.6-5.0-11.1-5.0-53.2-9.9-6.4-3.3-5.1-6.1-12.9-2.9-9.4-6.5-1.6-1.660.5-1.6-2.2-4.4-1.5-1.9-1.9-1.9-1.837.6

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

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect


Cash
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-31
Value155-652.530394034292497.5-10.230-69.730831623-21.0
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax20.9-201.411.115.4146.411.525.013.22.0-2.67.8-17.77.421.65.06.7-5.9

Depreciation Depletion And Amortization

us-gaap:DepreciationDepletionAndAmortization

us-gaap:DepreciationDepletionAndAmortization


Depreciation
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-03-31
Value251313121313121212111111101010109.59.69.39.09.08.78.28.18.18.08.08.07.77.47.26.97.07.06.96.76.66.36.36.26.45.75.74.84.0
Percentage of DepreciationDepletionAndAmortization100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DepreciationDepletionAndAmortization us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship

us-gaap:FairValueHedging


Depreciation
Period End2020-12-312020-09-302020-06-302020-03-312019-09-30
Value1312131312
Percentage of DepreciationDepletionAndAmortization100.0100.0100.0100.0100.0

Increase Decrease In Inventories

us-gaap:IncreaseDecreaseInInventories

us-gaap:IncreaseDecreaseInInventories


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-31
Value-3.124-5.5-23.9-13.217-14.9-38.6-2.81819150.49.6-4.312-3.61.9-22.06.16.9-4.14.90.0-0.73.33.413-5.0-11.32.1-1.8-5.69.65.6-13.5-6.3-10.4-8.8
Percentage of IncreaseDecreaseInInventories100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Net Cash Provided By Used In Operating Activities

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInOperatingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-31
Value16-11.456554252788347223728572610.058694.1573450214960407.4203244272141426.34532393542-12.117151.0
Percentage of NetCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax2.2-3.520.721.815.414.221.322.212.75.89.77.313.96.72.817.519.41.217.410.815.26.215.818.011.12.06.09.612.88.16.813.013.01.914.69.511.59.613.2-3.85.04.90.4

Net Income Loss

us-gaap:NetIncomeLoss

us-gaap:NetIncomeLoss


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-22.44.55.90.4-6.629-10.625192823212025-15.2194.73624142626132220-292.215152415272518339.12921266.14.44.511-0.95.50.18.8
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-3.01.42.20.2-2.47.9-2.96.85.17.16.15.55.06.6-4.36.01.310.17.44.67.87.74.26.65.5-78.64.64.77.14.78.87.95.79.92.98.76.17.31.91.41.33.5-0.32.10.03.3

us-gaap:NetIncomeLoss us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings


Net
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value-22.44.50.4-6.62925192823212025-15.2194.73624142626132220-292.215152415272518339.12921264.94.44.511
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.080.3100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-3.01.40.2-2.47.96.85.17.16.15.55.06.6-4.36.01.310.17.44.67.87.74.26.65.5-78.64.64.77.14.78.87.95.79.92.98.76.17.31.51.41.33.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Share Based Compensation

us-gaap:ShareBasedCompensation

us-gaap:ShareBasedCompensation


Share
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value3.93.12.62.73.01.71.42.33.72.41.92.72.92.83.23.53.63.03.03.13.12.62.52.22.72.11.60.92.52.00.71.42.12.60.41.61.32.51.41.21.41.40.61.01.51.6
Percentage of ShareBasedCompensation100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Net Cash Provided By Used In Investing Activities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-9.3-626.6-14.7-5.12818-72.5-11.6-18.71.031-75.8-4.780-11.2-30.8-4.921-47.9-143.8-78.8-5.9-24.7-15.5-12.172-33.217-38.19.6-36.0-89.621-9.7-23.0-88.9-8.2-1.8-8.9-9.8-8.2-89.4-4.0-12.4-12.2-17.8
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-1.3-193.4-5.4-2.010.25.0-19.7-3.1-5.00.38.0-19.3-1.120.8-3.2-9.3-1.46.0-14.4-44.9-23.5-1.7-7.8-4.6-3.319.6-9.85.0-11.12.9-11.6-28.06.7-2.9-7.3-26.5-2.4-0.5-2.8-3.0-2.4-27.7-1.5-4.7-4.3-6.7

Payments To Acquire Productive Assets

us-gaap:PaymentsToAcquireProductiveAssets

us-gaap:PaymentsToAcquireProductiveAssets


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value8.99.1145.410211910161321171619191624141815162524151111199.514152321169.3188.87.99.09.68.87.96.24.08.21213
Percentage of PaymentsToAcquireProductiveAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Net Cash Provided By Used In Financing Activities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value148-14.5-11.3-11.2332-28.586-22.2-21.5-34.0-38.2-22.4-22.6-22.8-21.6-10.9-40.4-46.5-27.5-13.1152-17.2-35.3-16.8-195.4-36.9-21.8-11.3-17.5-20.6-40.2-9.2-30.8-22.0-4.9-5.3209-5.7-6.9-14.3-5.0-6.1-5.1-5.0-5.0100
Percentage of NetCashProvidedByUsedInFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax20.0-4.5-4.2-4.4120.7-7.723.4-5.9-5.7-8.6-9.8-5.7-5.4-5.9-6.1-3.3-11.3-13.1-8.3-4.145.6-5.0-11.1-5.0-53.2-9.9-6.4-3.3-5.1-6.1-12.9-2.9-9.4-6.5-1.6-1.660.5-1.6-2.2-4.4-1.5-1.9-1.9-1.9-1.837.6

Payments Of Dividends

us-gaap:PaymentsOfDividends

us-gaap:PaymentsOfDividends


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-31
Value1111101010119.69.79.9109.29.29.310.08.58.69.38.18.18.2
Percentage of PaymentsOfDividends100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Dividends

us-gaap:Dividends us-gaap:SubsequentEventType

us-gaap:Dividends

us-gaap:SubsequentEvent


Dividendsus-gaap:
Period End2021-07-132021-04-132021-01-142020-10-13
Value11111110
Percentage of Dividends100.0100.0100.0100.0

Payments For Repurchase Of Common Stock

us-gaap:PaymentsForRepurchaseOfCommonStock

us-gaap:PaymentsForRepurchaseOfCommonStock


Payments
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-03-312010-12-312010-03-31
Value0.00.00.0123.61210182813135.7122.33132195.12.26.34.13.71328155.01112344.025140.00.00.00.00.00.00.044
Percentage of PaymentsForRepurchaseOfCommonStock0.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.00.00.00.00.00.0100.0

Effective Income Tax Rate Continuing Operations

us-gaap:EffectiveIncomeTaxRateContinuingOperations

us-gaap:EffectiveIncomeTaxRateContinuingOperations


Effective
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-31
Value41.0-6.0222.0-0.240.250.260.270.260.2730.2750.1860.4470.3170.340.3870.3770.3650.3630.3720.3760.3670.370.3740.2890.3860.1970.3840.0020.381-0.0430.0120.363
Percentage of EffectiveIncomeTaxRateContinuingOperations100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Deferred Tax Liabilities

us-gaap:DeferredTaxLiabilities

us-gaap:DeferredTaxLiabilities


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value138663598289201240206114121
Percentage of DeferredTaxLiabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Deferred Tax Assets Net

us-gaap:DeferredTaxAssetsNet

us-gaap:DeferredTaxAssetsNet


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value759495127239299317344368404413
Percentage of DeferredTaxAssetsNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Unrecognized Tax Benefits

us-gaap:UnrecognizedTaxBenefits

us-gaap:UnrecognizedTaxBenefits


Unrecognized
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-312017-09-302017-06-302016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-312009-12-312008-12-31
Value4.04.03.83.93.93.94.11.71.71.51.51.51.51.51.51.51.81.81.71.71.71.61.62.12.23.73.73.86.98.68.815141314131315151515
Percentage of UnrecognizedTaxBenefits100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Deferred Tax Assets Valuation Allowance

us-gaap:DeferredTaxAssetsValuationAllowance

us-gaap:DeferredTaxAssetsValuationAllowance


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value6.49.98.41315211919181820
Percentage of DeferredTaxAssetsValuationAllowance100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

kalu:BusinessCombinationEstimateOfPostCloseAdjustments us-gaap:BusinessAcquisition

kalu:BusinessCombinationEstimateOfPostCloseAdjustments

kalu:AlcoaWarrickLLC


Business
Period End2021-06-302021-03-31
Value-8000000.0-12700000.0
Percentage of BusinessCombinationEstimateOfPostCloseAdjustments100.0100.0

kalu:BusinessCombinationOtherPostRetirementBenefitsLiabilities us-gaap:BusinessAcquisition

kalu:BusinessCombinationOtherPostRetirementBenefitsLiabilities

kalu:AlcoaWarrickLLC


Business
Period End2020-11-30
Value83
Percentage of BusinessCombinationOtherPostRetirementBenefitsLiabilities100.0

kalu:DefinedBenefitPlanNetPeriodicBenefitCostAndChargesRelatingToOtherBenefitPlans us-gaap:RetirementPlanType

kalu:DefinedBenefitPlanNetPeriodicBenefitCostAndChargesRelatingToOtherBenefitPlans

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Defined
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-30
Value8.15.14.34.96.04.94.87.54.54.97.14.7
Percentage of DefinedBenefitPlanNetPeriodicBenefitCostAndChargesRelatingToOtherBenefitPlans100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

kalu:DefinedBenefitPlanNetPeriodicCostBenefitVEBA

kalu:DefinedBenefitPlanNetPeriodicCostBenefitVEBA


Defined
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value600000.01200000.01100000.01200000.01200000.01600000.01600000.01600000.0
Percentage of DefinedBenefitPlanNetPeriodicCostBenefitVEBA100.0100.0100.0100.0100.0100.0100.0100.0

kalu:EffectiveIncomeTaxRateReconciliationPermanentItemsNondeductibleForTaxPurpose

kalu:EffectiveIncomeTaxRateReconciliationPermanentItemsNondeductibleForTaxPurpose


Effective
Period End2021-06-30
Value4.0
Percentage of EffectiveIncomeTaxRateReconciliationPermanentItemsNondeductibleForTaxPurpose100.0

kalu:EffectiveTaxRateReconciliationChangeInForecastedEarningsAmount

kalu:EffectiveTaxRateReconciliationChangeInForecastedEarningsAmount


Effective
Period End2020-09-30
Value-700000.0
Percentage of EffectiveTaxRateReconciliationChangeInForecastedEarningsAmount100.0

kalu:EffectiveTaxRateReconciliationChangeInForecastedEarningsPercent

kalu:EffectiveTaxRateReconciliationChangeInForecastedEarningsPercent


Effective
Period End2020-09-302020-06-30
Value211.037.0
Percentage of EffectiveTaxRateReconciliationChangeInForecastedEarningsPercent100.0100.0

kalu:EffectiveTaxRateReconciliationForeignWithholdingTax

kalu:EffectiveTaxRateReconciliationForeignWithholdingTax


Effective
Period End2021-06-30
Value5.0
Percentage of EffectiveTaxRateReconciliationForeignWithholdingTax100.0

kalu:FuturePaymentsToAcquireBusiness us-gaap:BusinessAcquisition

kalu:FuturePaymentsToAcquireBusiness

kalu:AlcoaWarrickLLC


Future
Period End2020-11-30
Value587
Percentage of FuturePaymentsToAcquireBusiness100.0

kalu:IncreaseDecreaseInNoncurrentAssetsAndLiabilitiesNet

kalu:IncreaseDecreaseInNoncurrentAssetsAndLiabilitiesNet


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value-1900000.03100000.03300000.0-4800000.0-2900000.0-1900000.0-200000.0-4700000.0
Percentage of IncreaseDecreaseInNoncurrentAssetsAndLiabilitiesNet100.0100.0100.0100.0100.0100.0100.0100.0

kalu:OtherNonoperatingIncomeExpenseNet

kalu:OtherNonoperatingIncomeExpenseNet


Other
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value400000.0200000.0100000.0200000.0-600000.00-400000.0200000.0
Percentage of OtherNonoperatingIncomeExpenseNet100.0100.0100.0100.0100.00.0100.0100.0

kalu:QuarterlyDividendIncreasePercentage us-gaap:SubsequentEventType

kalu:QuarterlyDividendIncreasePercentage

us-gaap:SubsequentEvent


Quarterly
Period End2021-01-14
Value7.5
Percentage of QuarterlyDividendIncreasePercentage100.0

kalu:ReclassificationFromAOCIDueToCancellationOfFirmCommitment us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:HedgingDesignation, us-gaap:IncomeStatementLocation

kalu:ReclassificationFromAOCIDueToCancellationOfFirmCommitment

us-gaap:ForeignExchangeContract, us-gaap:FairValueHedging, us-gaap:DesignatedAsHedgingInstrument, us-gaap:OtherNonoperatingIncomeExpense


Reclassification
Period End2020-12-312020-09-302020-06-30
Value1000000.00-400000.0
Percentage of ReclassificationFromAOCIDueToCancellationOfFirmCommitment100.00.0100.0

kalu:ReclassificationFromAOCIDueToCancellationOfFirmCommitment us-gaap:StatementEquityComponents

us-gaap:AociDerivativeQualifyingAsHedgeExcludedComponentParent


Reclassification
Period End2020-12-312020-09-302020-06-30
Value0-1200000.0600000.0
Percentage of ReclassificationFromAOCIDueToCancellationOfFirmCommitment0.00.0-150.0

kalu:ReclassificationFromAOCIDueToForecastedSalesNoLongerProbableOfOccurring us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:HedgingDesignation, us-gaap:IncomeStatementLocation

kalu:ReclassificationFromAOCIDueToForecastedSalesNoLongerProbableOfOccurring

kalu:AlloyMetalReclassificationDueToForecastedTransactions, us-gaap:CashFlowHedging, us-gaap:DesignatedAsHedgingInstrument, us-gaap:CostOfSales


Reclassification
Period End2020-09-302020-06-30
Value100000.0700000.0
Percentage of ReclassificationFromAOCIDueToForecastedSalesNoLongerProbableOfOccurring100.0100.0

kalu:ReclassificationFromAOCIDueToForecastedSalesNoLongerProbableOfOccurring us-gaap:StatementEquityComponents

us-gaap:AccumulatedGainLossNetCashFlowHedgeParent


Reclassification
Period End2020-09-302020-06-30
Value-100000.0700000.0
Percentage of ReclassificationFromAOCIDueToForecastedSalesNoLongerProbableOfOccurring-100.0100.0

kalu:RestructuringBenefit

kalu:RestructuringBenefit


Restructuring
Period End2021-03-31
Value700000.0
Percentage of RestructuringBenefit100.0

kalu:RestructuringBenefitCosts

kalu:RestructuringBenefitCosts


Restructuring
Period End2021-06-302020-06-30
Value-0.111
Percentage of RestructuringBenefitCosts100.0100.0

kalu:SellingAdministrativeResearchAndDevelopmentAndGeneralExpenses

kalu:SellingAdministrativeResearchAndDevelopmentAndGeneralExpenses


Selling
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value30312321222322232725222326232224262325252726202123222019222012131616131614171713171415161517
Percentage of SellingAdministrativeResearchAndDevelopmentAndGeneralExpenses100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AccountsReceivableSale

us-gaap:AccountsReceivableSale


Accounts
Period End2021-06-30
Value316
Percentage of AccountsReceivableSale100.0

us-gaap:AccrualForEnvironmentalLossContingenciesPeriodIncreaseDecrease

us-gaap:AccrualForEnvironmentalLossContingenciesPeriodIncreaseDecrease


Accrual
Period End2020-09-30
Value3.8
Percentage of AccrualForEnvironmentalLossContingenciesPeriodIncreaseDecrease100.0

us-gaap:AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation

us-gaap:AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation


Adjustments
Period End2021-03-312020-03-31
Value2400000.04300000.0
Percentage of AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation100.0100.0

us-gaap:AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital


Adjustments
Period End2021-03-312020-03-31
Value2400000.04300000.0
Percentage of AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation100.0100.0

us-gaap:AmortizationOfFinancingCostsAndDiscounts

us-gaap:AmortizationOfFinancingCostsAndDiscounts


Amortization
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value0.50.70.60.60.50.30.30.30.30.30.20.30.20.30.30.30.30.30.30.30.20.30.10.60.43.23.03.02.92.92.82.82.72.72.62.62.32.33.01.81.91.91.51.51.50.0
Percentage of AmortizationOfFinancingCostsAndDiscounts100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0

us-gaap:AssetImpairmentCharges

us-gaap:AssetImpairmentCharges


Asset
Period End2020-12-312020-09-302019-12-312019-09-302011-12-312010-12-31
Value0.00.5260.00.02.7
Percentage of AssetImpairmentCharges0.0100.0100.00.00.0100.0

us-gaap:BusinessAcquisitionsProFormaNetIncomeLoss

us-gaap:BusinessAcquisitionsProFormaNetIncomeLoss


Business
Period End2021-06-302021-03-312020-06-302020-03-312011-06-302010-06-30
Value-14.29.9-38.83.54.51.7
Percentage of BusinessAcquisitionsProFormaNetIncomeLoss100.0100.0100.0100.0100.0100.0

us-gaap:BusinessAcquisitionsProFormaRevenue

us-gaap:BusinessAcquisitionsProFormaRevenue


Business
Period End2021-06-302021-03-312020-06-302020-03-312011-06-302010-06-30
Value741635534636338291
Percentage of BusinessAcquisitionsProFormaRevenue100.0100.0100.0100.0100.0100.0

us-gaap:BusinessCombinationAcquisitionRelatedCosts us-gaap:BusinessAcquisition

us-gaap:BusinessCombinationAcquisitionRelatedCosts

kalu:AlcoaWarrickLLC


Business
Period End2021-03-31
Value11
Percentage of BusinessCombinationAcquisitionRelatedCosts100.0

us-gaap:BusinessCombinationAcquisitionRelatedCosts us-gaap:BusinessAcquisition, us-gaap:IncomeStatementLocation

kalu:AlcoaWarrickLLC, kalu:SellingGeneralAdministrativeResearchAndDevelopment


Business
Period End2021-06-30
Value3.0
Percentage of BusinessCombinationAcquisitionRelatedCosts0.0

us-gaap:BusinessCombinationConsiderationTransferred1 us-gaap:BusinessAcquisition

us-gaap:BusinessCombinationConsiderationTransferred1

kalu:AlcoaWarrickLLC


Business
Period End2021-06-302021-03-31
Value609604
Percentage of BusinessCombinationConsiderationTransferred1100.0100.0

us-gaap:CapitalExpendituresIncurredButNotYetPaid

us-gaap:CapitalExpendituresIncurredButNotYetPaid


Capital
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value3.72.01.01.3-2.54.71.20.9-2.34.71.20.7-0.15.24.0-0.70.43.72.2-0.20.62.06.10.62.51.30.00.7-2.33.40.9-0.91.72.72.2-0.90.31.81.5-0.40.00.71.1-1.2
Percentage of CapitalExpendituresIncurredButNotYetPaid100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0

us-gaap:CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths

us-gaap:CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths


Cash
Period End2021-06-302021-03-312020-12-31
Value15134.1
Percentage of CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths100.0100.0100.0

us-gaap:ChangeInUnrealizedGainLossOnFairValueHedgingInstruments1 us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation, us-gaap:IncomeStatementLocation

us-gaap:ChangeInUnrealizedGainLossOnFairValueHedgingInstruments1

us-gaap:ForeignExchangeContract, us-gaap:DesignatedAsHedgingInstrument, kalu:DepreciationandAmortization


Change
Period End2020-12-312020-06-302020-03-31
Value0200000.0-200000.0
Percentage of ChangeInUnrealizedGainLossOnFairValueHedgingInstruments10.0100.0100.0

us-gaap:ChangeInUnrealizedGainLossOnHedgedItemInFairValueHedge1 us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:HedgingDesignation, us-gaap:IncomeStatementLocation

us-gaap:ChangeInUnrealizedGainLossOnHedgedItemInFairValueHedge1

us-gaap:ForeignExchangeContract, us-gaap:FairValueHedging, us-gaap:DesignatedAsHedgingInstrument, kalu:DepreciationandAmortization


Change
Period End2020-12-312020-06-302020-03-312019-03-31
Value0-200000.0200000.00
Percentage of ChangeInUnrealizedGainLossOnHedgedItemInFairValueHedge10.0100.0100.00.0

us-gaap:CommonStockDividendsPerShareDeclared us-gaap:SubsequentEventType

us-gaap:CommonStockDividendsPerShareDeclared

us-gaap:SubsequentEvent


Common
Period End2020-07-142020-04-142020-01-142019-10-152019-07-152019-04-152019-01-152018-10-152018-07-162018-04-162018-01-162017-10-122017-07-172017-04-172017-01-172016-10-142016-07-152016-04-152016-01-152015-10-132015-07-142015-04-162015-01-132014-10-142014-07-152014-04-222014-02-142013-10-15
Value0.670.670.670.60.60.60.60.550.550.550.550.50.50.50.50.450.450.450.450.40.40.40.40.350.350.350.350.3
Percentage of CommonStockDividendsPerShareDeclared100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ContractWithCustomerPerformanceObligationSatisfiedInPreviousPeriod

us-gaap:ContractWithCustomerPerformanceObligationSatisfiedInPreviousPeriod


Contract
Period End2020-09-30
Value15
Percentage of ContractWithCustomerPerformanceObligationSatisfiedInPreviousPeriod100.0

us-gaap:DebtInstrumentRedemptionPricePercentageOfPrincipalAmountRedeemed us-gaap:DebtInstrument, us-gaap:LongtermDebtType

us-gaap:DebtInstrumentRedemptionPricePercentageOfPrincipalAmountRedeemed

kalu:SeniorNotesDueTwoThousandAndTwentyFive, us-gaap:SeniorNotes


Debt
Period End2021-05-21
Value108.83
Percentage of DebtInstrumentRedemptionPricePercentageOfPrincipalAmountRedeemed100.0

us-gaap:DebtSecuritiesAvailableForSaleRealizedGainLoss

us-gaap:DebtSecuritiesAvailableForSaleRealizedGainLoss


Debt
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value-100000.00600000.01500000.01400000.0900000.01200000.0
Percentage of DebtSecuritiesAvailableForSaleRealizedGainLoss100.00.0100.0100.0100.0100.0100.0

us-gaap:DeferredCompensationArrangementWithIndividualCompensationExpense us-gaap:RetirementPlanType

us-gaap:DeferredCompensationArrangementWithIndividualCompensationExpense

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Deferred
Period End2021-06-302020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-09-30
Value0.40.70.40.8-0.40.30.30.30.7-0.20.20.90.10.5
Percentage of DeferredCompensationArrangementWithIndividualCompensationExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredIncomeTaxesAndTaxCredits

us-gaap:DeferredIncomeTaxesAndTaxCredits


Deferred
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value-17.3-0.90.4-1.01.014-6.79.57.9109.39.69.97.950181.818169.41615191212-176.74.77.2138.7141410157.21512167.61.82.45.8
Percentage of DeferredIncomeTaxesAndTaxCredits100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DefinedBenefitPlanAmortizationOfGainsLosses us-gaap:RetirementPlanName, us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanAmortizationOfGainsLosses

kalu:SalariedVEBA, us-gaap:DefinedBenefitPostretirementHealthCoverage


Defined
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value-100000.0-100000.0-100000.00-100000.0-100000.0-100000.0-100000.0
Percentage of DefinedBenefitPlanAmortizationOfGainsLosses100.0100.0100.00.0100.0100.0100.0100.0

us-gaap:DefinedBenefitPlanAmortizationOfPriorServiceCostCredit us-gaap:RetirementPlanName, us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanAmortizationOfPriorServiceCostCredit

kalu:SalariedVEBA, us-gaap:DefinedBenefitPostretirementHealthCoverage


Defined
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value0.80.91.21.21.11.21.41.4
Percentage of DefinedBenefitPlanAmortizationOfPriorServiceCostCredit100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DefinedBenefitPlanExpectedReturnOnPlanAssets us-gaap:RetirementPlanName, us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanExpectedReturnOnPlanAssets

kalu:SalariedVEBA, us-gaap:DefinedBenefitPostretirementHealthCoverage


Defined
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value0.80.80.70.70.70.70.70.7
Percentage of DefinedBenefitPlanExpectedReturnOnPlanAssets100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DefinedBenefitPlanForeignCurrencyExchangeRateChangesBenefitObligation us-gaap:StatementEquityComponents

us-gaap:DefinedBenefitPlanForeignCurrencyExchangeRateChangesBenefitObligation

us-gaap:AccumulatedDefinedBenefitPlansAdjustment


Defined
Period End2020-09-302020-06-302020-03-312018-12-312018-09-302017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value-100000.00100000.0000-100000.000000100000.0
Percentage of DefinedBenefitPlanForeignCurrencyExchangeRateChangesBenefitObligation100.00.0100.00.00.00.0100.00.00.00.00.00.0100.0

us-gaap:DefinedBenefitPlanInterestCost us-gaap:RetirementPlanName, us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanInterestCost

kalu:SalariedVEBA, us-gaap:DefinedBenefitPostretirementHealthCoverage


Defined
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value0.40.40.60.60.70.60.80.8
Percentage of DefinedBenefitPlanInterestCost100.0100.0100.0100.0100.0100.0100.0100.0

kalu:WarrickRollingMill, us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Defined
Period End2021-06-30
Value0.6
Percentage of DefinedBenefitPlanInterestCost150.0

kalu:WarrickRollingMill, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2021-06-30
Value0.1
Percentage of DefinedBenefitPlanInterestCost25.0

us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost

us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost


Defined
Period End2021-06-302020-06-302018-12-312018-09-302017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value1.21.22.01.61.41.21.11.11.20.80.90.81.00.60.60.6-5.8-6.0-6.1-5.6-5.1-5.6-5.7-5.6-2.6-2.9-3.0-3.0-1.2-1.5-1.5-1.5
Percentage of DefinedBenefitPlanNetPeriodicBenefitCost100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost us-gaap:RetirementPlanName, us-gaap:RetirementPlanType

kalu:SalariedVEBA, us-gaap:DefinedBenefitPostretirementHealthCoverage


Defined
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value0.50.61.21.21.21.21.71.6
Percentage of DefinedBenefitPlanNetPeriodicBenefitCost41.70.00.00.0100.00.00.00.0

kalu:WarrickRollingMill, us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Defined
Period End2021-06-30
Value1.0
Percentage of DefinedBenefitPlanNetPeriodicBenefitCost83.3

kalu:WarrickRollingMill, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2021-06-30
Value1.3
Percentage of DefinedBenefitPlanNetPeriodicBenefitCost108.3

us-gaap:DefinedBenefitPlanServiceCost us-gaap:RetirementPlanName, us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanServiceCost

kalu:SalariedVEBA, us-gaap:DefinedBenefitPostretirementHealthCoverage


Defined
Period End2020-12-312020-09-30
Value0100000.0
Percentage of DefinedBenefitPlanServiceCost0.0100.0

kalu:WarrickRollingMill, us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Defined
Period End2021-06-30
Value400000.0
Percentage of DefinedBenefitPlanServiceCost0.0

kalu:WarrickRollingMill, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2021-06-30
Value1200000.0
Percentage of DefinedBenefitPlanServiceCost0.0

us-gaap:DefinedContributionPlanCostRecognized us-gaap:RetirementPlanType

us-gaap:DefinedContributionPlanCostRecognized

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Defined
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-09-30
Value3600000.03400000.01300000.01400000.01700000.03900000.01500000.01700000.01700000.03900000.01500000.01700000.01300000.04300000.01400000.0
Percentage of DefinedContributionPlanCostRecognized100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:Depreciation

us-gaap:Depreciation


Depreciation
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value221212121212121111111010101010.09.99.29.29.08.68.68.37.87.77.77.67.67.67.37.06.86.56.56.66.46.36.15.95.75.75.95.75.74.8
Percentage of Depreciation100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DerivativeFairValueHedgeIncludedInEffectivenessGainLoss us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:HedgingDesignation, us-gaap:IncomeStatementLocation

us-gaap:DerivativeFairValueHedgeIncludedInEffectivenessGainLoss

us-gaap:ForeignExchangeContract, us-gaap:FairValueHedging, us-gaap:DesignatedAsHedgingInstrument, us-gaap:OtherNonoperatingIncomeExpense


Derivative
Period End2020-12-312020-09-302020-06-30
Value1000000.00-300000.0
Percentage of DerivativeFairValueHedgeIncludedInEffectivenessGainLoss100.00.0100.0

us-gaap:DerivativeGainLossOnDerivativeNet us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:HedgingDesignation

us-gaap:DerivativeGainLossOnDerivativeNet

us-gaap:ForeignExchangeContract, us-gaap:FairValueHedging, us-gaap:DesignatedAsHedgingInstrument


Derivative
Period End2020-12-312020-09-302020-06-302020-03-31
Value0.00.0-0.1-0.2
Percentage of DerivativeGainLossOnDerivativeNet0.00.0100.0100.0

us-gaap:DerivativeGainLossOnDerivativeNet us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:HedgingDesignation, us-gaap:IncomeStatementLocation

kalu:AlloyMetalHedge, us-gaap:CashFlowHedging, us-gaap:DesignatedAsHedgingInstrument, us-gaap:CostOfSales


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value-0.20.90.70.0-1.5-0.6-0.4-0.5-0.1-0.1
Percentage of DerivativeGainLossOnDerivativeNet0.00.00.00.01500.0300.00.00.00.00.0

kalu:Aluminum, us-gaap:CashFlowHedging, us-gaap:DesignatedAsHedgingInstrument, us-gaap:CostOfSales


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value8.12.90.8-1.2-7.6-5.7-4.9-4.8-4.5-4.2
Percentage of DerivativeGainLossOnDerivativeNet0.00.00.00.07600.02850.00.00.00.00.0

kalu:NaturalGas, us-gaap:CashFlowHedging, us-gaap:DesignatedAsHedgingInstrument, us-gaap:CostOfSales


Derivative
Period End2021-06-302020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value0.1-0.1-0.3-0.4-0.5-0.1-0.1-0.10.1
Percentage of DerivativeGainLossOnDerivativeNet0.00.00.0400.0250.00.00.00.00.0

us-gaap:DerivativeGainLossOnDerivativeNet us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation, us-gaap:IncomeStatementLocation

kalu:AlloyingMetals, us-gaap:Nondesignated, us-gaap:CostOfSales


Derivative
Period End2021-06-30
Value1.5
Percentage of DerivativeGainLossOnDerivativeNet0.0

us-gaap:DerivativeGainLossOnDerivativeNet us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:HedgingDesignation, us-gaap:IncomeStatementLocation

us-gaap:CashFlowHedging, us-gaap:DesignatedAsHedgingInstrument, us-gaap:CostOfSales


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value8.73.81.5-1.6-10.5-7.0-5.4-5.4-4.7-4.2
Percentage of DerivativeGainLossOnDerivativeNet0.00.00.00.010500.03500.00.00.00.00.0

us-gaap:DerivativeGainLossOnDerivativeNet us-gaap:HedgingDesignation, us-gaap:IncomeStatementLocation

us-gaap:Nondesignated, us-gaap:CostOfSales


Derivative
Period End2021-06-302020-12-312020-09-302019-12-312019-09-302018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value1.13.21.50.1-0.10.00.00.00.133-3.95.10.0
Percentage of DerivativeGainLossOnDerivativeNet0.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:DerivativeGainLossOnDerivativeNet us-gaap:ProductOrService, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:HedgingDesignation, us-gaap:IncomeStatementLocation

us-gaap:Electricity, us-gaap:CashFlowHedging, us-gaap:DesignatedAsHedgingInstrument, us-gaap:CostOfSales


Derivative
Period End2021-06-302020-12-312020-09-302020-06-302020-03-31
Value0.70.1-0.1-0.3-0.2
Percentage of DerivativeGainLossOnDerivativeNet0.00.00.0300.0100.0

us-gaap:DerivativeGainOnDerivative us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation, us-gaap:IncomeStatementLocation

us-gaap:DerivativeGainOnDerivative

kalu:AlloyingMetals, us-gaap:Nondesignated, us-gaap:CostOfSales


Derivative
Period End2021-03-312020-12-312020-09-30
Value300000.01700000.01800000.0
Percentage of DerivativeGainOnDerivative100.0100.0100.0

us-gaap:DerivativeGainOnDerivative us-gaap:HedgingDesignation, us-gaap:IncomeStatementLocation

us-gaap:Nondesignated, us-gaap:CostOfSales


Derivative
Period End2021-03-31
Value300000.0
Percentage of DerivativeGainOnDerivative100.0

us-gaap:DerivativeLossOnDerivative us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation, us-gaap:IncomeStatementLocation

us-gaap:DerivativeLossOnDerivative

kalu:AlloyingMetals, us-gaap:Nondesignated, us-gaap:CostOfSales


Derivative
Period End2021-06-302020-12-312020-09-30
Value400000.0-1500000.0300000.0
Percentage of DerivativeLossOnDerivative100.0100.0100.0

us-gaap:DividendsCash

us-gaap:DividendsCash


Dividends
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-31
Value11111010119.79.9109.29.29.310.08.58.69.3
Percentage of DividendsCash100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DividendsCash us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings


Dividends
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-31
Value11111010119.79.9109.29.29.310.08.58.69.3
Percentage of DividendsCash100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate

us-gaap:EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate


Effective
Period End2021-06-302021-03-31
Value17.0-15.0
Percentage of EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate100.0100.0

us-gaap:EffectiveIncomeTaxRateReconciliationNondeductibleExpense

us-gaap:EffectiveIncomeTaxRateReconciliationNondeductibleExpense


Effective
Period End2021-06-302020-09-302019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value22.03.980.020.020.010.0190.0210.02
Percentage of EffectiveIncomeTaxRateReconciliationNondeductibleExpense100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EffectiveIncomeTaxRateReconciliationShareBasedCompensationExcessTaxBenefitAmount

us-gaap:EffectiveIncomeTaxRateReconciliationShareBasedCompensationExcessTaxBenefitAmount


Effective
Period End2021-03-312020-09-302019-09-302018-09-302018-06-30
Value-200000.0-100000.0-100000.00-300000.0
Percentage of EffectiveIncomeTaxRateReconciliationShareBasedCompensationExcessTaxBenefitAmount100.0100.0100.00.0100.0

us-gaap:EffectiveIncomeTaxRateReconciliationShareBasedCompensationExcessTaxBenefitPercent

us-gaap:EffectiveIncomeTaxRateReconciliationShareBasedCompensationExcessTaxBenefitPercent


Effective
Period End2021-06-302021-03-312020-09-302019-09-302018-09-302018-06-30
Value1.0-6.01.9800.007-0.01
Percentage of EffectiveIncomeTaxRateReconciliationShareBasedCompensationExcessTaxBenefitPercent100.0100.0100.00.0100.0100.0

us-gaap:EffectiveIncomeTaxRateReconciliationTaxContingenciesStateAndLocal

us-gaap:EffectiveIncomeTaxRateReconciliationTaxContingenciesStateAndLocal


Effective
Period End2021-06-302021-03-312020-09-302020-06-302019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-03-31
Value1.0-10.022.00.190-0.010.02-0.0130.012-0.027-0.0150.014-0.0080.007
Percentage of EffectiveIncomeTaxRateReconciliationTaxContingenciesStateAndLocal100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EffectiveIncomeTaxRateReconciliationTaxCreditsResearch

us-gaap:EffectiveIncomeTaxRateReconciliationTaxCreditsResearch


Effective
Period End2021-06-30
Value-15.0
Percentage of EffectiveIncomeTaxRateReconciliationTaxCreditsResearch100.0

us-gaap:EquitySecuritiesFvNiGainLoss

us-gaap:EquitySecuritiesFvNiGainLoss


Equity
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value100000.0-100000.0300000.0300000.0700000.0-600000.0100000.0100000.00500000.0-700000.0100000.0-400000.0
Percentage of EquitySecuritiesFvNiGainLoss100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0

us-gaap:FederalIncomeTaxExpenseBenefitContinuingOperations

us-gaap:FederalIncomeTaxExpenseBenefitContinuingOperations


Federal
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-30
Value-16.7-0.6-2.0-0.91.09.5-13.58.56.89.53.07.57.55.643151.9188.89.11514211313-175.84.09.2139.16.2141115-0.217
Percentage of FederalIncomeTaxExpenseBenefitContinuingOperations100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FinanceLeaseInterestExpense

us-gaap:FinanceLeaseInterestExpense


Finance
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value100000.0100000.0100000.00100000.0100000.0100000.00100000.0100000.0
Percentage of FinanceLeaseInterestExpense100.0100.0100.00.0100.0100.0100.00.0100.0100.0

us-gaap:FinanceLeaseRightOfUseAssetAmortization

us-gaap:FinanceLeaseRightOfUseAssetAmortization


Finance
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value500000.0500000.0400000.0500000.0300000.0400000.0300000.0500000.0300000.0400000.0
Percentage of FinanceLeaseRightOfUseAssetAmortization100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ForeignIncomeTaxExpenseBenefitContinuingOperations

us-gaap:ForeignIncomeTaxExpenseBenefitContinuingOperations


Foreign
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value1200000.0300000.00200000.0300000.0100000.0400000.0200000.0500000.0300000.0400000.0700000.0300000.0300000.0900000.0400000.0300000.0200000.00300000.0200000.0200000.0900000.0-800000.0-1400000.00-1700000.00600000.0300000.0-4700000.0-4400000.0600000.0-7200000.0400000.0500000.0800000.0700000.0700000.0-1200000.0600000.0500000.00-2100000.0400000.0
Percentage of ForeignIncomeTaxExpenseBenefitContinuingOperations100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.00.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0

us-gaap:GainLossOnSaleOfInvestments

us-gaap:GainLossOnSaleOfInvestments


Gain
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-31
Value00200000.0500000.0300000.0200000.0100000.0300000.0500000.0900000.0400000.01100000.0500000.0500000.0600000.0700000.00000-100000.00000100000.0-200000.0500000.00
Percentage of GainLossOnSaleOfInvestments0.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.00.00.0100.00.00.00.00.0100.0100.0100.00.0

us-gaap:GainLossOnSaleOfPropertyPlantEquipment

us-gaap:GainLossOnSaleOfPropertyPlantEquipment


Gain
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-312017-09-302016-12-312016-09-302015-12-312015-09-302014-12-312014-09-302013-12-312013-09-302012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-100000.0200000.0-100000.0-200000.0-100000.0-100000.0200000.000300000.0100000.0500000.00-200000.0-100000.0-200000.0-100000.00100000.0-100000.0100000.0000-100000.000-100000.0000-100000.0
Percentage of GainLossOnSaleOfPropertyPlantEquipment100.0100.0100.0100.0100.0100.0100.00.00.0100.0100.0100.00.0100.0100.0100.0100.00.0100.0100.0100.00.00.00.0100.00.00.0100.00.00.00.0100.0

us-gaap:IncomeTaxReconciliationChangeInEnactedTaxRate

us-gaap:IncomeTaxReconciliationChangeInEnactedTaxRate


Income
Period End2021-03-31
Value-600000.0
Percentage of IncomeTaxReconciliationChangeInEnactedTaxRate100.0

us-gaap:IncomeTaxReconciliationNondeductibleExpense

us-gaap:IncomeTaxReconciliationNondeductibleExpense


Income
Period End2020-09-302019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value400000.0500000.0500000.0400000.0600000.0600000.0600000.0
Percentage of IncomeTaxReconciliationNondeductibleExpense100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncomeTaxReconciliationTaxContingenciesStateAndLocal

us-gaap:IncomeTaxReconciliationTaxContingenciesStateAndLocal


Income
Period End2021-03-312020-09-302020-06-302019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-03-31
Value-400000.0100000.01000000.0-200000.0100000.0700000.0-400000.0300000.0-800000.0-1000000.0100000.0-400000.0300000.0
Percentage of IncomeTaxReconciliationTaxContingenciesStateAndLocal100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInAccountsAndOtherReceivables

us-gaap:IncreaseDecreaseInAccountsAndOtherReceivables


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value9831-17.4-6.9-49.112-29.011-15.012-13.46.16.62326-2.7-12.5190.16.7-4.624-13.2-8.5-14.018-2.68.7-1.32.2-3.42.2-19.123-30.9241.831-30.98.15.625-7.2-2.9-2.814
Percentage of IncreaseDecreaseInAccountsAndOtherReceivables100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInAccountsPayableTrade

us-gaap:IncreaseDecreaseInAccountsPayableTrade


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value8233211.1-50.421-2.6-8.5-20.87.4-1.9-12.81132-8.6110.79.42.6-2.61.51.91.4-8.9-6.50.4-8.4161.810-10.3-0.4-0.89.9-5.70.40.73.3-1.6-11.110.0131.0-3.3-1.58.0
Percentage of IncreaseDecreaseInAccountsPayableTrade100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInAccruedLiabilities

us-gaap:IncreaseDecreaseInAccruedLiabilities


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value114.2-9.3-5.513-2.4-4.23.3
Percentage of IncreaseDecreaseInAccruedLiabilities100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInContractWithCustomerAsset

us-gaap:IncreaseDecreaseInContractWithCustomerAsset


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value2.19999999999999938.31.3-6.8-5.5-7.58.5-0.8-11.53.5
Percentage of IncreaseDecreaseInContractWithCustomerAsset100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets

us-gaap:IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value8100000.0400000.0-1400000.0-3000000.04800000.02800000.00-2600000.0900000.03400000.0-1200000.0-1400000.0800000.02200000.0-100000.0-2400000.0900000.03300000.07100000.0-1800000.0500000.02200000.0-500000.0-1700000.0-700000.02400000.0-300000.0-1200000.0-200000.02300000.0-1000000.0-1800000.0-600000.02300000.0300000.0-3100000.0-500000.01900000.0900000.0-300000.01600000.0700000.03500000.0-1800000.0-1400000.0600000.0
Percentage of IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InterestCostsCapitalized

us-gaap:InterestCostsCapitalized


Interest
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302011-09-302011-06-302010-09-302010-06-30
Value300000.0100000.0300000.0200000.0300000.0400000.0400000.0500000.0400000.0400000.0500000.0700000.0700000.0500000.0600000.0900000.0900000.0400000.0400000.0300000.0300000.0800000.01100000.01000000.0700000.0400000.0300000.0400000.0200000.0800000.01000000.0
Percentage of InterestCostsCapitalized100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InterestExpenseBorrowings us-gaap:DebtInstrument, us-gaap:LongtermDebtType

us-gaap:InterestExpenseBorrowings

kalu:SeniorNotesDueTwoThousandAndTwentyFive, us-gaap:SeniorNotes


Interest
Period End2021-05-21
Value30
Percentage of InterestExpenseBorrowings100.0

us-gaap:InvestmentIncomeInterest

us-gaap:InvestmentIncomeInterest


Investment
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value0100000.0100000.0200000.0200000.0100000.0100000.0200000.0100000.0200000.0100000.0100000.00100000.0200000.0000000100000.0100000.0100000.00200000.0200000.0300000.0200000.0300000.0200000.0100000.00100000.0100000.0100000.0100000.0100000.000100000.0100000.0100000.0200000.0
Percentage of InvestmentIncomeInterest0.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.00.00.00.00.00.00.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.00.00.0100.0100.0100.0100.0

us-gaap:LeaseCost

us-gaap:LeaseCost


Lease
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value4.32.82.62.62.52.62.72.62.42.8
Percentage of LeaseCost100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:MultiemployerPlanEmployerContributionCost us-gaap:RetirementPlanType

us-gaap:MultiemployerPlanEmployerContributionCost

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Multiemployer
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value1300000.01100000.01100000.01300000.01200000.01300000.01300000.01300000.0
Percentage of MultiemployerPlanEmployerContributionCost100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OciBeforeReclassificationsBeforeTaxAttributableToParent us-gaap:StatementEquityComponents

us-gaap:OciBeforeReclassificationsBeforeTaxAttributableToParent

us-gaap:AccumulatedGainLossNetCashFlowHedgeParent


Oci
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value28136.67.84.1-27.91.6-8.4-10.1
Percentage of OciBeforeReclassificationsBeforeTaxAttributableToParent100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss


Oci
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value-0.10.00.11.31.71.00.71.01.11.31.31.00.91.01.01.10.60.90.40.0
Percentage of OciBeforeReclassificationsBeforeTaxAttributableToParent-1.50.02.4-4.7106.2-11.9-6.90.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AociDerivativeQualifyingAsHedgeExcludedComponentParent


Oci
Period End2020-12-312020-09-302020-06-302020-03-312019-03-31
Value0.00.0-0.2-0.80.0
Percentage of OciBeforeReclassificationsBeforeTaxAttributableToParent0.00.0-4.92.90.0

us-gaap:OciBeforeReclassificationsNetOfTaxAttributableToParent us-gaap:StatementEquityComponents

us-gaap:OciBeforeReclassificationsNetOfTaxAttributableToParent

us-gaap:AccumulatedGainLossNetCashFlowHedgeParent


Oci
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value21104.95.93.2-21.11.2-6.3-7.7
Percentage of OciBeforeReclassificationsNetOfTaxAttributableToParent100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss


Oci
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value-0.50.00.11.01.30.70.60.70.91.00.90.80.60.60.60.70.40.50.30.0
Percentage of OciBeforeReclassificationsNetOfTaxAttributableToParent-10.20.03.1-4.7108.3-11.1-7.80.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AociDerivativeQualifyingAsHedgeExcludedComponentParent


Oci
Period End2020-12-312020-09-302020-06-302020-03-312019-03-31
Value0.00.0-0.2-0.60.0
Percentage of OciBeforeReclassificationsNetOfTaxAttributableToParent0.00.0-6.22.80.0

us-gaap:OperatingLeaseCost

us-gaap:OperatingLeaseCost


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value2900000.02000000.01600000.01600000.01800000.01800000.01900000.01800000.01800000.02000000.0
Percentage of OperatingLeaseCost100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingLeasePayments

us-gaap:OperatingLeasePayments


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value2200000.01300000.01100000.01100000.01200000.01100000.01000000.01000000.0900000.0900000.0
Percentage of OperatingLeasePayments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax

us-gaap:OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax


Other
Period End2020-12-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value200000.00-300000.0-200000.0100000.0-100000.0-200000.0-100000.0-200000.0-100000.0-200000.0-100000.0300000.0200000.0100000.0300000.0300000.0300000.00100000.0-300000.0-100000.00-200000.0-100000.0100000.00-100000.0200000.00-100000.0
Percentage of OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.00.0100.0100.0100.00.0100.0100.00.0100.0

us-gaap:OtherComprehensiveIncomeLossBeforeReclassificationsTax us-gaap:StatementEquityComponents

us-gaap:OtherComprehensiveIncomeLossBeforeReclassificationsTax

us-gaap:AccumulatedGainLossNetCashFlowHedgeParent


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value6.73.31.71.90.9-6.80.4-2.1-2.4
Percentage of OtherComprehensiveIncomeLossBeforeReclassificationsTax100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss


Other
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-30
Value0.40.00.6-0.3-0.4-0.3-0.1-0.3-0.2-0.3-0.4-0.2-0.3-0.4-0.4-0.4-1.20.40.10.00.2-0.1-0.1
Percentage of OtherComprehensiveIncomeLossBeforeReclassificationsTax23.50.066.74.4-100.014.34.20.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AociDerivativeQualifyingAsHedgeExcludedComponentParent


Other
Period End2020-12-312020-09-302020-06-302020-03-312019-03-31
Value0.00.0-0.40.20.0
Percentage of OtherComprehensiveIncomeLossBeforeReclassificationsTax0.00.0-44.4-2.90.0

us-gaap:OtherComprehensiveIncomeLossDerivativeExcludedComponentIncreaseDecreaseAfterAdjustmentsBeforeTaxParent us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:HedgingDesignation, us-gaap:IncomeStatementLocation

us-gaap:OtherComprehensiveIncomeLossDerivativeExcludedComponentIncreaseDecreaseAfterAdjustmentsBeforeTaxParent

us-gaap:ForeignExchangeContract, us-gaap:FairValueHedging, us-gaap:DesignatedAsHedgingInstrument, kalu:DepreciationandAmortization


Other
Period End2020-12-312020-09-302020-06-302020-03-312019-03-31
Value00-200000.0-200000.00
Percentage of OtherComprehensiveIncomeLossDerivativeExcludedComponentIncreaseDecreaseAfterAdjustmentsBeforeTaxParent0.00.0100.0100.00.0

us-gaap:OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax

us-gaap:OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312015-06-30
Value158.54.57.310-15.95.4-2.2-4.28.8-8.2-1.75.3-9.30.00.40.00.3-0.1
Percentage of OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.00.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent

us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value159.1158.211-15.54.6-0.9-3.29.7-9.0-0.86.4-8.31.61.11.3-7.91.10.90.9-3.00.10.466-79.71.32.10.92.20.61.31.2550.91.51.1-67.61.10.80.4
Percentage of OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent us-gaap:StatementEquityComponents

us-gaap:AccumulatedDefinedBenefitPlansAdjustment


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value0.70.7100.80.91.1-1.01.21.11.1-0.61.11.21.2-3.90.80.80.9-8.00.70.70.8
Percentage of OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent4.47.769.39.87.6-7.1-21.7-133.3-34.411.36.7-137.518.8-14.50.050.072.769.2101.363.677.888.9

us-gaap:AccumulatedGainLossNetCashFlowHedgeParent


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value158.54.57.310-15.95.4-2.2-4.2
Percentage of OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent95.693.429.489.090.8102.6117.4244.4131.2

us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss


Other
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value0.20.0-0.3-0.20.20.1-0.1-0.2-0.1-0.2-0.1-0.2-0.10.30.20.10.30.30.30.0
Percentage of OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent1.30.0-2.51.34.3-11.13.1-2.11.125.0-1.62.40.018.818.27.7-3.827.333.30.0

us-gaap:AccumulatedOtherComprehensiveIncome


Other
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-03-31
Value159.18.211-15.5-0.9-3.29.7-9.0-0.86.4-8.31.61.11.3-7.91.10.90.9-3.00.10.466-79.71.32.10.92.20.61.31.2550.91.51.10.4
Percentage of OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AccumulatedTranslationAdjustment


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-03-312019-03-31
Value0.0-0.10.00.10.00.0
Percentage of OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent0.0-1.10.01.2-0.00.0

us-gaap:OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax

us-gaap:OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302011-12-312011-09-30
Value-0.7-0.7-10.6-0.8-0.9-1.11.0-1.2-1.1-1.10.6-1.1-1.2-1.23.9-0.8-0.8-0.98.0-0.7-0.7-0.83.0-0.7-0.6-66.879-1.3-1.2-1.6-2.6-0.7-0.9-0.9-55.5-1.167-0.6
Percentage of OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherNoncashIncomeExpense

us-gaap:OtherNoncashIncomeExpense


Other
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value3800000.01100000.0-1300000.0-1800000.0700000.0-3200000.0-2500000.0-3600000.0-6300000.0-2900000.0-4600000.0-8100000.0-4700000.0-400000.001200000.0-100000.0-200000.0-600000.0-300000.0-200000.00-100000.0-300000.0-100000.0-200000.0-200000.0-100000.04700000.02100000.0100000.02400000.0-100000.0-400000.0100000.0-800000.0-500000.0-100000.0300000.0-100000.01600000.0-1100000.0
Percentage of OtherNoncashIncomeExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherOperatingIncomeExpenseNet

us-gaap:OtherOperatingIncomeExpenseNet


Other
Period End2020-12-312020-09-302020-06-302019-12-312019-09-302019-06-302015-12-312015-09-302015-06-302014-12-312014-09-302014-06-302013-12-312013-09-302013-06-302012-12-312012-09-302012-06-302011-12-312011-09-30
Value-200000.0-300000.01100000.0-800000.00-100000.0-100000.0000-1300000.0-200000.0000-4400000.00-100000.00-100000.0
Percentage of OtherOperatingIncomeExpenseNet100.0100.0100.0100.00.0100.0100.00.00.00.0100.0100.00.00.00.0100.00.0100.00.0100.0

us-gaap:OtherPostretirementBenefitsPayments

us-gaap:OtherPostretirementBenefitsPayments


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value0.01.70.00.00.02.90.00.00.02.10.00.00.0150.00.00.0200.00.00.0190.00.00.0130.00.00.0160.00.00.020
Percentage of OtherPostretirementBenefitsPayments0.0100.00.00.00.0100.00.00.00.0100.00.00.00.0100.00.00.00.0100.00.00.00.0100.00.00.00.0100.00.00.00.0100.00.00.00.0100.0

us-gaap:OtherPostretirementBenefitsPayments us-gaap:RetirementPlanName, us-gaap:RetirementPlanType

kalu:SalariedVEBA, us-gaap:DefinedBenefitPostretirementHealthCoverage


Other
Period End2021-03-312020-03-31
Value1.72.9
Percentage of OtherPostretirementBenefitsPayments100.0100.0

us-gaap:PaymentsForRestructuring us-gaap:RestructuringPlan

us-gaap:PaymentsForRestructuring

kalu:TwoThousandAndTwentyRestructuringPlan


Payments
Period End2021-06-302021-03-31
Value200000.0400000.0
Percentage of PaymentsForRestructuring100.0100.0

us-gaap:PaymentsOfFinancingCosts

us-gaap:PaymentsOfFinancingCosts


Payments
Period End2020-12-312020-09-302013-12-312013-09-302012-12-312012-09-302011-12-312011-09-302011-06-302011-03-312010-12-312010-03-31
Value100000.00000200000.002100000.00002600000.0
Percentage of PaymentsOfFinancingCosts100.00.00.00.00.0100.00.0100.00.00.00.0100.0

us-gaap:PaymentsRelatedToTaxWithholdingForShareBasedCompensation

us-gaap:PaymentsRelatedToTaxWithholdingForShareBasedCompensation


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-31
Value02400000.00004300000.0001200000.05000000.00006900000.000100000.04400000.0100000.00100000.02700000.0-200000.00500000.02500000.000200000.02200000.0100000.0200000.002200000.00100000.002100000.02000000.0
Percentage of PaymentsRelatedToTaxWithholdingForShareBasedCompensation0.0100.00.00.00.0100.00.00.0100.0100.00.00.00.0100.00.00.0100.0100.0100.00.0100.0100.0100.00.0100.0100.00.00.0100.0100.0100.0100.00.0100.00.0100.00.0100.0100.0

us-gaap:PaymentsToAcquireAvailableForSaleSecuritiesDebt

us-gaap:PaymentsToAcquireAvailableForSaleSecuritiesDebt


Payments
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value0.00.00.0397523
Percentage of PaymentsToAcquireAvailableForSaleSecuritiesDebt0.00.00.0100.0100.0100.0

us-gaap:PaymentsToAcquireBusinessesGross

us-gaap:PaymentsToAcquireBusinessesGross


Payments
Period End2021-06-302021-03-312011-03-312010-03-31
Value0.0617830.0
Percentage of PaymentsToAcquireBusinessesGross0.0100.0100.00.0

us-gaap:ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities

us-gaap:ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities


Proceeds
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value0.00.0397822221332757236100595373110250.010.0200.00.00.08426570.025123550850.00.00.00.0
Percentage of ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities0.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.00.00.00.0100.0100.0100.00.0100.0100.0100.0100.0100.00.00.00.00.0

us-gaap:ProceedsFromSaleOfPropertyPlantAndEquipment

us-gaap:ProceedsFromSaleOfPropertyPlantAndEquipment


Proceeds
Period End2020-12-312020-09-302019-12-312019-09-302018-12-312018-09-302017-12-312016-12-31
Value0.00.30.00.00.00.60.00.0
Percentage of ProceedsFromSaleOfPropertyPlantAndEquipment0.0100.00.00.00.0100.00.00.0

us-gaap:ReclassificationFromAociCurrentPeriodBeforeTaxAttributableToParent us-gaap:StatementEquityComponents

us-gaap:ReclassificationFromAociCurrentPeriodBeforeTaxAttributableToParent

us-gaap:AccumulatedDefinedBenefitPlansAdjustmentNetPriorServiceCostCredit


Reclassification
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value-0.8-0.9-1.2-1.2-1.11.21.41.41.41.41.41.31.41.31.11.21.21.21.11.01.01.0
Percentage of ReclassificationFromAociCurrentPeriodBeforeTaxAttributableToParent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AccumulatedDefinedBenefitPlansAdjustmentNetUnamortizedGainLoss


Reclassification
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value-0.1-0.1-0.20.0-0.10.10.20.10.10.10.30.20.20.20.30.20.20.20.20.10.10.1
Percentage of ReclassificationFromAociCurrentPeriodBeforeTaxAttributableToParent12.511.116.7-0.09.18.314.37.17.17.121.415.414.315.427.316.716.716.718.210.010.010.0

us-gaap:AccumulatedGainLossNetCashFlowHedgeParent


Reclassification
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value8.72.70.7-1.8-9.3-7.0-5.4-5.4-4.7
Percentage of ReclassificationFromAociCurrentPeriodBeforeTaxAttributableToParent-1087.5-300.0-58.3150.0845.5-583.3-385.7-385.7-335.7

us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss


Reclassification
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-0.10.00.6-1.5-1.4-0.9-0.9-1.2-1.1-1.6-1.2-1.5-1.1-0.5-0.7-0.9-0.2-0.30.00.0
Percentage of ReclassificationFromAociCurrentPeriodBeforeTaxAttributableToParent8.3-0.0-54.5-125.0-100.0-64.3-64.3-85.7-78.6-123.1-85.7-115.4-100.0-41.7-58.3-75.0-18.2-30.00.00.0

us-gaap:AociDerivativeQualifyingAsHedgeExcludedComponentParent


Reclassification
Period End2020-12-312020-09-302020-06-302020-03-312019-03-31
Value0.00.0-0.20.20.0
Percentage of ReclassificationFromAociCurrentPeriodBeforeTaxAttributableToParent-0.0-0.018.216.70.0

us-gaap:ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent us-gaap:StatementEquityComponents

us-gaap:ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent

us-gaap:AccumulatedDefinedBenefitPlansAdjustment


Reclassification
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value-0.7-0.7-1.1-0.9-0.91.01.31.21.11.11.31.11.21.20.90.90.80.90.80.70.70.7
Percentage of ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AccumulatedGainLossNetCashFlowHedgeParent


Reclassification
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value6.52.10.4-1.4-7.6-5.2-4.2-4.1-3.5
Percentage of ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent-928.6-300.0-36.4155.6844.4-520.0-323.1-341.7-318.2

us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss


Reclassification
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-0.70.00.4-1.2-1.1-0.6-0.7-0.9-1.0-1.2-1.0-1.0-0.7-0.3-0.4-0.6-0.1-0.20.00.0
Percentage of ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent63.6-0.0-44.4-120.0-84.6-50.0-63.6-81.8-76.9-109.1-83.3-83.3-77.8-33.3-50.0-66.7-12.5-28.60.00.0

us-gaap:AociDerivativeQualifyingAsHedgeExcludedComponentParent


Reclassification
Period End2020-12-312020-09-302020-06-302020-03-312019-03-31
Value0.00.0-0.70.10.0
Percentage of ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent-0.0-0.077.810.00.0

us-gaap:ReclassificationFromAociCurrentPeriodTax us-gaap:StatementEquityComponents

us-gaap:ReclassificationFromAociCurrentPeriodTax

us-gaap:AccumulatedDefinedBenefitPlansAdjustment


Reclassification
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value-0.2-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.4-0.4-0.4-0.4-0.4-0.3-0.5-0.5-0.6-0.5-0.5-0.4-0.4-0.4
Percentage of ReclassificationFromAociCurrentPeriodTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AccumulatedGainLossNetCashFlowHedgeParent


Reclassification
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value2.20.60.3-0.5-2.4-1.8-1.2-1.3-1.2
Percentage of ReclassificationFromAociCurrentPeriodTax-1100.0-200.0-100.0166.7800.0600.0400.0433.3300.0

us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss


Reclassification
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value0.60.00.20.30.30.30.20.30.10.40.20.50.40.20.30.30.3-0.10.00.0-0.2-0.10.00.1
Percentage of ReclassificationFromAociCurrentPeriodTax-200.0-0.0-66.7-100.0-100.0-100.0-50.0-75.0-25.0-100.0-50.0-166.7-80.0-40.0-50.0-60.0-60.025.0-0.0-0.00.00.00.00.0

us-gaap:AociDerivativeQualifyingAsHedgeExcludedComponentParent


Reclassification
Period End2020-12-312020-09-302020-06-302020-03-312019-03-31
Value0.00.0-0.1-0.10.0
Percentage of ReclassificationFromAociCurrentPeriodTax-0.0-0.033.333.3-0.0

us-gaap:RepaymentsOfLongTermCapitalLeaseObligations

us-gaap:RepaymentsOfLongTermCapitalLeaseObligations


Repayments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-03-312013-12-312012-12-312011-12-312010-12-31
Value700000.0400000.0500000.0400000.0400000.0400000.0300000.0500000.0300000.0300000.0200000.0200000.0100000.0200000.0200000.0100000.0-100000.0200000.0-100000.00100000.0000-100000.0100000.00100000.0000
Percentage of RepaymentsOfLongTermCapitalLeaseObligations100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.00.00.00.0100.0100.00.0100.00.00.00.0

us-gaap:RepaymentsOfSeniorDebt us-gaap:DebtInstrument, us-gaap:LongtermDebtType

us-gaap:RepaymentsOfSeniorDebt

kalu:SeniorNotesDueTwoThousandAndTwentyFive, us-gaap:SeniorNotes


Repayments
Period End2021-05-21
Value382
Percentage of RepaymentsOfSeniorDebt100.0

us-gaap:RestructuringCharges

us-gaap:RestructuringCharges


Restructuring
Period End2020-12-312020-09-302020-06-302012-12-312012-09-302011-12-312011-09-30
Value-4.90.5110.00.00.0-0.3
Percentage of RestructuringCharges100.0100.0100.00.00.00.0100.0

us-gaap:RestructuringCharges us-gaap:RestructuringPlan

kalu:TwoThousandAndTwentyRestructuringPlan


Restructuring
Period End2021-06-302021-03-31
Value-7.66.8
Percentage of RestructuringCharges0.00.0

us-gaap:RestructuringReserveAccrualAdjustment1 us-gaap:RestructuringPlan

us-gaap:RestructuringReserveAccrualAdjustment1

kalu:TwoThousandAndTwentyRestructuringPlan


Restructuring
Period End2021-03-31
Value-700000.0
Percentage of RestructuringReserveAccrualAdjustment1100.0

us-gaap:RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability

us-gaap:RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability


Right
Period 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
Value100000.01800000.01000000.01900000.0200000.0100000.0100000.0400000.0500000.006200000.00
Percentage of RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.00.0

us-gaap:RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability

us-gaap:RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability


Right
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value2.799999999999998130.50.30.44.20.20.70.40.5
Percentage of RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ShortTermLeaseCost

us-gaap:ShortTermLeaseCost


Short
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value800000.0200000.0500000.0500000.0300000.0300000.0400000.0300000.0200000.0300000.0
Percentage of ShortTermLeaseCost100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StockIssuedDuringPeriodValueShareBasedCompensation

us-gaap:StockIssuedDuringPeriodValueShareBasedCompensation


Stock
Period End2021-06-302020-06-302019-06-30
Value300000.0400000.0300000.0
Percentage of StockIssuedDuringPeriodValueShareBasedCompensation100.0100.0100.0

us-gaap:StockIssuedDuringPeriodValueShareBasedCompensation us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital


Stock
Period End2021-06-302020-06-302019-06-30
Value300000.0400000.0300000.0
Percentage of StockIssuedDuringPeriodValueShareBasedCompensation100.0100.0100.0

us-gaap:WorkersCompensationDiscountPercent

us-gaap:WorkersCompensationDiscountPercent


Workers
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302012-12-312012-09-302012-06-302012-03-31
Value0.4900.010-0.0025-0.0050.02500.002500.02750.0025000.020.0025000-0.00250.01
Percentage of WorkersCompensationDiscountPercent100.00.0100.00.0100.0100.0100.00.0100.00.0100.0100.00.00.0100.0100.00.00.00.0100.0100.0

kalu:AccrualForEnvironmentalLossContingenciesIncludesLongTermAndShortTermLiabilities us-gaap:EnvironmentalRemediationContingency

kalu:AccrualForEnvironmentalLossContingenciesIncludesLongTermAndShortTermLiabilities

kalu:ComprehensiveEnvironmentalResponseCompensationAndLiabilityAct


Accrual
Period End2020-09-30
Value1200000.0
Percentage of AccrualForEnvironmentalLossContingenciesIncludesLongTermAndShortTermLiabilities100.0

kalu:AccruedAnnualVEBAContribution

kalu:AccruedAnnualVEBAContribution


Accrued
Period End2020-12-312019-12-31
Value1700000.02900000.0
Percentage of AccruedAnnualVEBAContribution100.0100.0

kalu:AccruedAnnualVebaContribution

kalu:AccruedAnnualVebaContribution


Accrued
Period End2020-12-312020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312011-12-312011-09-302011-06-302010-12-31
Value1.70.02.90.00.00.02.10.00.00.015121111200.00.00.0190.00.00.0130.00.00.0160.00.00.0200.00.00.02.1
Percentage of AccruedAnnualVebaContribution100.00.0100.00.00.00.0100.00.00.00.0100.0100.0100.0100.0100.00.00.00.0100.00.00.00.0100.00.00.00.0100.00.00.00.0100.00.00.00.0100.0

kalu:BusinessCombinationRecognizedIdentifiableAssetAcquiredAndLiabilityAssumedPensionAndOtherPostRetirementBenefits us-gaap:BusinessAcquisition

kalu:BusinessCombinationRecognizedIdentifiableAssetAcquiredAndLiabilityAssumedPensionAndOtherPostRetirementBenefits

kalu:AlcoaWarrickLLC


Business
Period End2021-06-302021-03-31
Value8383
Percentage of BusinessCombinationRecognizedIdentifiableAssetAcquiredAndLiabilityAssumedPensionAndOtherPostRetirementBenefits100.0100.0

kalu:BusinessCombinationRecognizedIdentifiableAssetAcquiredAndLiabilityAssumedPensionAndOtherPostRetirementBenefits us-gaap:Restatement, us-gaap:BusinessAcquisition

srt:RestatementAdjustment, kalu:AlcoaWarrickLLC


Business
Period End2021-06-30
Value-0.1
Percentage of BusinessCombinationRecognizedIdentifiableAssetAcquiredAndLiabilityAssumedPensionAndOtherPostRetirementBenefits-0.1

kalu:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivablesOther us-gaap:BusinessAcquisition

kalu:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivablesOther

kalu:AlcoaWarrickLLC


Business
Period End2021-06-302021-03-31
Value116.2
Percentage of BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivablesOther100.0100.0

kalu:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivablesOther us-gaap:Restatement, us-gaap:BusinessAcquisition

srt:RestatementAdjustment, kalu:AlcoaWarrickLLC


Business
Period End2021-06-30
Value5.3
Percentage of BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivablesOther46.1

kalu:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesEmployeeRelatedLiabilities us-gaap:BusinessAcquisition

kalu:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesEmployeeRelatedLiabilities

kalu:AlcoaWarrickLLC


Business
Period End2021-06-302021-03-31
Value6900000.05900000.0
Percentage of BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesEmployeeRelatedLiabilities100.0100.0

kalu:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesEmployeeRelatedLiabilities us-gaap:Restatement, us-gaap:BusinessAcquisition

srt:RestatementAdjustment, kalu:AlcoaWarrickLLC


Business
Period End2021-06-30
Value1000000.0
Percentage of BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesEmployeeRelatedLiabilities14.5

kalu:ConditionalAssetRetirementObligationMeasurementInput us-gaap:MeasurementInputType

kalu:ConditionalAssetRetirementObligationMeasurementInput

us-gaap:MeasurementInputRiskFreeInterestRate


Conditional
Period End2020-12-312019-12-312018-12-31
Value8.70.0870.087
Percentage of ConditionalAssetRetirementObligationMeasurementInput100.0100.0100.0

kalu:ConstructionInProgressExpectedToResumeOnFutureDate

kalu:ConstructionInProgressExpectedToResumeOnFutureDate


Construction
Period End2021-06-302021-03-312020-12-31
Value192020
Percentage of ConstructionInProgressExpectedToResumeOnFutureDate100.0100.0100.0

kalu:ConstructionInProgressTemporarilyIdled

kalu:ConstructionInProgressTemporarilyIdled


Construction
Period End2020-12-312020-09-30
Value2019
Percentage of ConstructionInProgressTemporarilyIdled100.0100.0

kalu:DeferredTaxAssetsLeasedAssets

kalu:DeferredTaxAssetsLeasedAssets


Deferred
Period End2020-12-312019-12-312018-12-31
Value7300000.07100000.00
Percentage of DeferredTaxAssetsLeasedAssets100.0100.00.0

kalu:DeferredTaxAssetsOperatingLossCarryforwardsAndTaxCredits

kalu:DeferredTaxAssetsOperatingLossCarryforwardsAndTaxCredits


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value33484898191255275321342375379
Percentage of DeferredTaxAssetsOperatingLossCarryforwardsAndTaxCredits100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

kalu:DefinedBenefitPlanExpectedFutureBenefitPaymentAfterYearFourForNextFiveYears

kalu:DefinedBenefitPlanExpectedFutureBenefitPaymentAfterYearFourForNextFiveYears


Defined
Period End2021-06-302021-03-31
Value3131
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentAfterYearFourForNextFiveYears100.0100.0

kalu:DefinedBenefitPlanExpectedFutureBenefitPaymentAfterYearFourForNextFiveYears us-gaap:RetirementPlanName, us-gaap:RetirementPlanType

kalu:WarrickRollingMill, us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Defined
Period End2021-06-302021-03-31
Value2727
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentAfterYearFourForNextFiveYears86.086.1

kalu:DiscountFeesRecognized

kalu:DiscountFeesRecognized


Discount
Period End2021-06-30
Value1900000.0
Percentage of DiscountFeesRecognized100.0

kalu:EstimatedAnnualContributionToPensionAndOtherPostretirementBenefitPlans us-gaap:Range

kalu:EstimatedAnnualContributionToPensionAndOtherPostretirementBenefitPlans

srt:Maximum


Estimated
Period End2020-12-31
Value5000000.0
Percentage of EstimatedAnnualContributionToPensionAndOtherPostretirementBenefitPlans100.0

srt:Minimum


Estimated
Period End2020-12-31
Value3000000.0
Percentage of EstimatedAnnualContributionToPensionAndOtherPostretirementBenefitPlans60.0

kalu:EstimatedAnnualContributionToPensionAndOtherPostretirementBenefitPlans us-gaap:Range, us-gaap:RetirementPlanName

srt:Maximum, kalu:SalariedVEBA


Estimated
Period End2020-12-31
Value1700000.0
Percentage of EstimatedAnnualContributionToPensionAndOtherPostretirementBenefitPlans34.0

kalu:ExcessOfStatedLIFOValueOverReplacementOrCurrentCosts

kalu:ExcessOfStatedLIFOValueOverReplacementOrCurrentCosts


Excess
Period End2020-09-30
Value4200000.0
Percentage of ExcessOfStatedLIFOValueOverReplacementOrCurrentCosts100.0

kalu:FinanceLeaseLiabilityPaymentsDueAfterYearFour

kalu:FinanceLeaseLiabilityPaymentsDueAfterYearFour


Finance
Period End2021-06-302021-03-312020-09-30
Value6100000.06600000.01900000.0
Percentage of FinanceLeaseLiabilityPaymentsDueAfterYearFour100.0100.0100.0

kalu:LeaseLiability

kalu:LeaseLiability


Lease
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value515138383735
Percentage of LeaseLiability100.0100.0100.0100.0100.0100.0

kalu:LeaseRightOfUseAsset

kalu:LeaseRightOfUseAsset


Lease
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value484834343432
Percentage of LeaseRightOfUseAsset100.0100.0100.0100.0100.0100.0

kalu:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFour

kalu:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFour


Lessee
Period End2021-06-302021-03-312020-09-30
Value171719
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFour100.0100.0100.0

kalu:MultiemployerPlansCollectiveBargainingArrangementPercentageOfEmployersParticipantsToAllEmployees

kalu:MultiemployerPlansCollectiveBargainingArrangementPercentageOfEmployersParticipantsToAllEmployees


Multiemployer
Period End2020-12-31
Value50.0
Percentage of MultiemployerPlansCollectiveBargainingArrangementPercentageOfEmployersParticipantsToAllEmployees100.0

kalu:NetLiabilityInRespectOfVeba

kalu:NetLiabilityInRespectOfVeba


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312010-12-31
Value1717173232323232323232313131312728282818181819151616170.04.04.54.95.3192020200.0
Percentage of NetLiabilityInRespectOfVeba100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.00.0

kalu:UnpaidClaimLiabilitiesRelatingToInsuranceRecoverables

kalu:UnpaidClaimLiabilitiesRelatingToInsuranceRecoverables


Unpaid
Period End2020-09-302019-12-31
Value3029
Percentage of UnpaidClaimLiabilitiesRelatingToInsuranceRecoverables100.0100.0

kalu:WorkersCompensationCharges

kalu:WorkersCompensationCharges


Workers
Period End2020-12-31
Value600000.0
Percentage of WorkersCompensationCharges100.0

kalu:Workerscompensationliabilityundiscounted

kalu:Workerscompensationliabilityundiscounted


Workerscompensationliabilityundiscounted
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-312014-12-312013-12-312012-12-312012-09-302012-06-302012-03-312011-12-312010-12-31
Value293029292827282727262624262526262525232529272424242420
Percentage of Workerscompensationliabilityundiscounted100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AccountsReceivableGrossCurrent us-gaap:AccountsNotesLoansAndFinancingReceivablesByBillingStatusType

us-gaap:AccountsReceivableGrossCurrent

us-gaap:BilledRevenues


Accounts
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302012-12-31
Value389306113119127176168188178196179194191186165138146157138142135139116132138149128132123124120116124
Percentage of AccountsReceivableGrossCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AccrualForEnvironmentalLossContingencies

us-gaap:AccrualForEnvironmentalLossContingencies


Accrual
Period End2021-06-302021-03-312020-12-312020-09-302019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-312008-12-31
Value17181820171616171819222122209.79.6
Percentage of AccrualForEnvironmentalLossContingencies100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AccrualForEnvironmentalLossContingencies us-gaap:EnvironmentalRemediationContingency

kalu:ComprehensiveEnvironmentalResponseCompensationAndLiabilityAct


Accrual
Period End2020-09-30
Value1.9
Percentage of AccrualForEnvironmentalLossContingencies9.2

us-gaap:AccruedBonusesCurrentAndNoncurrent us-gaap:DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensation

us-gaap:AccruedBonusesCurrentAndNoncurrent

us-gaap:DeferredBonus


Accrued
Period End2021-06-302021-03-312020-12-312020-09-30
Value6700000.02700000.05200000.03700000.0
Percentage of AccruedBonusesCurrentAndNoncurrent100.0100.0100.0100.0

us-gaap:AccruedEmployeeBenefitsCurrentAndNoncurrent

us-gaap:AccruedEmployeeBenefitsCurrentAndNoncurrent


Accrued
Period End2020-12-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-312014-12-31
Value3100000.03500000.03300000.03300000.03400000.03600000.03100000.03000000.03100000.03500000.03300000.03300000.03800000.03600000.03300000.03200000.03200000.02900000.0
Percentage of AccruedEmployeeBenefitsCurrentAndNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AccruedEnvironmentalLossContingenciesCurrent

us-gaap:AccruedEnvironmentalLossContingenciesCurrent


Accrued
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302018-12-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value3600000.04000000.03700000.04500000.06600000.04700000.05500000.04300000.02600000.01400000.01400000.01400000.01300000.01600000.02200000.02200000.02200000.02300000.03300000.03600000.03600000.02800000.05300000.04600000.04700000.03000000.02300000.01700000.01300000.01200000.01100000.0900000.01100000.0
Percentage of AccruedEnvironmentalLossContingenciesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AccruedEnvironmentalLossContingenciesNoncurrent

us-gaap:AccruedEnvironmentalLossContingenciesNoncurrent


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
Value131415161112111212131414141415161515151616161716171717161818201617171819202020202019
Percentage of AccruedEnvironmentalLossContingenciesNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AccruedLiabilitiesAndOtherLiabilities

us-gaap:AccruedLiabilitiesAndOtherLiabilities


Accrued
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302011-12-31
Value24261718243422253326271413117.86.87.26.44.54.43.62.93.64.33.53.53.73.13.03.16.65.84.84.55.34.84.1
Percentage of AccruedLiabilitiesAndOtherLiabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AllowanceForDoubtfulAccountsReceivableCurrent

us-gaap:AllowanceForDoubtfulAccountsReceivableCurrent


Allowance
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value700000.0900000.0800000.0800000.01100000.01400000.01400000.0800000.0800000.0800000.0800000.01200000.01200000.01200000.01200000.0800000.01100000.01100000.0800000.0800000.0800000.0800000.0800000.0800000.0800000.0800000.0800000.0800000.0800000.0800000.0800000.0800000.0800000.0800000.0800000.0700000.0900000.0900000.0900000.0700000.0600000.0600000.0600000.0800000.0
Percentage of AllowanceForDoubtfulAccountsReceivableCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AssetRetirementObligation

us-gaap:AssetRetirementObligation


Asset
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-312009-12-312008-12-31
Value6700000.06500000.06300000.05900000.05500000.04900000.04800000.04400000.04100000.04600000.04200000.04100000.04000000.04000000.03900000.03800000.03500000.03300000.0
Percentage of AssetRetirementObligation100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AssetsHeldForSaleNotPartOfDisposalGroup

us-gaap:AssetsHeldForSaleNotPartOfDisposalGroup


Assets
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302014-12-31
Value2000000.01700000.01700000.01700000.01500000.02300000.01600000.01600000.01600000.01600000.01600000.01600000.01900000.01900000.01900000.0300000.0300000.0300000.0300000.0300000.0300000.0300000.0300000.0300000.0300000.00
Percentage of AssetsHeldForSaleNotPartOfDisposalGroup100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0

us-gaap:BankOverdrafts

us-gaap:BankOverdrafts


Bank
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302011-12-31
Value7.07.02.12.43.35.74.23.73.56.64.85.66.44.77.37.18.24.65.84.57.810.08.0105.09.29.16.69.1109.67.8115.74.74.06.20.0
Percentage of BankOverdrafts100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0

us-gaap:BuildingsAndImprovementsGross

us-gaap:BuildingsAndImprovementsGross


Buildings
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value1761761171111101061049998979796929192909089888483727168646463625454535251515050494945454543
Percentage of BuildingsAndImprovementsGross100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets us-gaap:BusinessAcquisition

us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets

kalu:AlcoaWarrickLLC


Business
Period End2021-06-30
Value300000.0
Percentage of BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets100.0

us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets us-gaap:Restatement, us-gaap:BusinessAcquisition

srt:RestatementAdjustment, kalu:AlcoaWarrickLLC


Business
Period End2021-06-30
Value300000.0
Percentage of BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets100.0

us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables us-gaap:BusinessAcquisition

us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables

kalu:AlcoaWarrickLLC


Business
Period End2021-06-302021-03-31
Value153162
Percentage of BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables100.0100.0

us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables us-gaap:Restatement, us-gaap:BusinessAcquisition

srt:RestatementAdjustment, kalu:AlcoaWarrickLLC


Business
Period End2021-06-30
Value-8.7
Percentage of BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables-5.7

us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable us-gaap:BusinessAcquisition

us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable

kalu:AlcoaWarrickLLC


Business
Period End2021-06-302021-03-31
Value141143
Percentage of BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable100.0100.0

us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable us-gaap:Restatement, us-gaap:BusinessAcquisition

srt:RestatementAdjustment, kalu:AlcoaWarrickLLC


Business
Period End2021-06-30
Value-1.8
Percentage of BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable-1.3

us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesOther us-gaap:BusinessAcquisition

us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesOther

kalu:AlcoaWarrickLLC


Business
Period End2021-06-302021-03-31
Value4.211
Percentage of BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesOther100.0100.0

us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesOther us-gaap:Restatement, us-gaap:BusinessAcquisition

srt:RestatementAdjustment, kalu:AlcoaWarrickLLC


Business
Period End2021-06-30
Value-7.3
Percentage of BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesOther-173.8

us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory us-gaap:BusinessAcquisition

us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory

kalu:AlcoaWarrickLLC


Business
Period End2021-06-302021-03-31
Value210209
Percentage of BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory100.0100.0

us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory us-gaap:Restatement, us-gaap:BusinessAcquisition

srt:RestatementAdjustment, kalu:AlcoaWarrickLLC


Business
Period End2021-06-30
Value1.0
Percentage of BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory0.5

us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets us-gaap:BusinessAcquisition

us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets

kalu:AlcoaWarrickLLC


Business
Period End2021-06-30
Value50
Percentage of BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets100.0

us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets us-gaap:Restatement, us-gaap:BusinessAcquisition

srt:RestatementAdjustment, kalu:AlcoaWarrickLLC


Business
Period End2021-06-30
Value50
Percentage of BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets100.0

us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment us-gaap:BusinessAcquisition

us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment

kalu:AlcoaWarrickLLC


Business
Period End2021-06-302021-03-31
Value340385
Percentage of BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment100.0100.0

us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment us-gaap:Restatement, us-gaap:BusinessAcquisition

srt:RestatementAdjustment, kalu:AlcoaWarrickLLC


Business
Period End2021-06-30
Value-44.5
Percentage of BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment-13.1

us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet us-gaap:BusinessAcquisition

us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet

kalu:AlcoaWarrickLLC


Business
Period End2021-06-302021-03-31
Value609604
Percentage of BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet100.0100.0

us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet us-gaap:Restatement, us-gaap:BusinessAcquisition

srt:RestatementAdjustment, kalu:AlcoaWarrickLLC


Business
Period End2021-06-30
Value4.7
Percentage of BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet0.8

us-gaap:CashAndCashEquivalentsFairValueDisclosure us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency

us-gaap:CashAndCashEquivalentsFairValueDisclosure

us-gaap:FairValueInputsLevel1, us-gaap:FairValueMeasurementsRecurring


Cash
Period End2020-12-312020-09-302020-06-302019-12-312019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312010-12-31
Value78075071028322922231817231730233726503440374220429356968578978821071353177749135
Percentage of CashAndCashEquivalentsFairValueDisclosure100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CashAndCashEquivalentsFairValueDisclosure us-gaap:FairValueByMeasurementFrequency

us-gaap:FairValueMeasurementsRecurring


Cash
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312010-12-31
Value78075071030726417212211512594164135517357345572195707282542201772121741851692242812482732553177749135
Percentage of CashAndCashEquivalentsFairValueDisclosure100.0100.0100.00.0937.20.0380.1393.5548.5406.5906.1780.3217.4427.2186.0146.4145.6272.0386.0204.9179.9222.6128.4107.8602.4599.7249.9270.9293.8250.9360.7299.2253.4188.8100.0100.0100.0100.0

us-gaap:CashCashEquivalentsAndShortTermInvestments

us-gaap:CashCashEquivalentsAndShortTermInvestments


Cash
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302014-12-31
Value7807507103072641721221151259416413551735734557219570728254177
Percentage of CashCashEquivalentsAndShortTermInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ContractWithCustomerAssetNetCurrent

us-gaap:ContractWithCustomerAssetNetCurrent


Contract
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value46443634414754464658545152570.0
Percentage of ContractWithCustomerAssetNetCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0

us-gaap:DebtInstrumentFaceAmount us-gaap:DebtInstrument, us-gaap:LongtermDebtType

us-gaap:DebtInstrumentFaceAmount

kalu:SeniorNotesDueTwoThousandAndTwentyFive, us-gaap:SeniorNotes


Debt
Period End2020-12-312020-06-302020-05-012020-04-28
Value35035050300
Percentage of DebtInstrumentFaceAmount100.0100.0100.0100.0

us-gaap:DebtInstrumentFairValue us-gaap:DebtInstrument, us-gaap:LongtermDebtType

us-gaap:DebtInstrumentFairValue

kalu:SeniorNotesDueTwoThousandAndTwentyEight, us-gaap:SeniorNotes


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value516511521468482513
Percentage of DebtInstrumentFairValue100.0100.0100.0100.0100.0100.0

kalu:SeniorNotesDueTwoThousandAndTwentyFive, us-gaap:SeniorNotes


Debt
Period End2021-03-312020-12-312020-09-302020-06-30
Value371376361365
Percentage of DebtInstrumentFairValue72.672.377.275.8

kalu:UnsecuredSeniorNotesDueJuneOneTwoThousandAndThirtyOne, us-gaap:SeniorNotes


Debt
Period End2021-06-30
Value566
Percentage of DebtInstrumentFairValue109.6

us-gaap:DebtInstrumentInterestRateEffectivePercentage us-gaap:DebtInstrument, us-gaap:LongtermDebtType

us-gaap:DebtInstrumentInterestRateEffectivePercentage

kalu:SeniorNotesDueTwoThousandAndTwentyFive, us-gaap:SeniorNotes


Debt
Period End2021-03-312020-12-312020-09-302020-06-30
Value6.86.86.80.068
Percentage of DebtInstrumentInterestRateEffectivePercentage100.0100.0100.0100.0

kalu:UnsecuredSeniorNotesDueJuneOneTwoThousandAndThirtyOne, us-gaap:SeniorNotes


Debt
Period End2021-06-30
Value4.7
Percentage of DebtInstrumentInterestRateEffectivePercentage0.0

us-gaap:DeferredCompensationPlanAssets us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency

us-gaap:DeferredCompensationPlanAssets

us-gaap:FairValueInputsLevel12And3, us-gaap:FairValueMeasurementsRecurring


Deferred
Period End2020-12-312019-12-31
Value9.68.1
Percentage of DeferredCompensationPlanAssets100.0100.0

us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring


Deferred
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-06-302014-03-312013-12-312013-09-302012-12-31
Value109.59.69.18.87.68.17.912111010109.99.89.79.58.68.28.37.87.37.37.07.67.17.37.46.66.56.35.6
Percentage of DeferredCompensationPlanAssets0.00.0100.00.00.00.0100.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:DeferredIncomeTaxAssetsNet

us-gaap:DeferredIncomeTaxAssetsNet


Deferred
Period End2021-06-302020-03-312019-12-312018-12-31
Value1.22.01135
Percentage of DeferredIncomeTaxAssetsNet100.0100.0100.0100.0

us-gaap:DeferredIncomeTaxLiabilities

us-gaap:DeferredIncomeTaxLiabilities


Deferred
Period End2020-12-312019-12-31
Value8986
Percentage of DeferredIncomeTaxLiabilities100.0100.0

us-gaap:DeferredTaxAssetsInventory

us-gaap:DeferredTaxAssetsInventory


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value6.99.4209.30.00.0212.51.78.327
Percentage of DeferredTaxAssetsInventory100.0100.0100.0100.00.00.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxAssetsOther

us-gaap:DeferredTaxAssetsOther


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value2930272139383534353925
Percentage of DeferredTaxAssetsOther100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions

us-gaap:DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value4.88.78.01123255.16.17.60.00.8
Percentage of DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0

us-gaap:DeferredTaxLiabilitiesDeferredExpenseCapitalizedInventoryCosts

us-gaap:DeferredTaxLiabilitiesDeferredExpenseCapitalizedInventoryCosts


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-31
Value2.12.01.82.20.09.46.7140.0
Percentage of DeferredTaxLiabilitiesDeferredExpenseCapitalizedInventoryCosts100.0100.0100.0100.00.0100.0100.0100.00.0

us-gaap:DeferredTaxLiabilitiesLeasingArrangements

us-gaap:DeferredTaxLiabilitiesLeasingArrangements


Deferred
Period End2020-12-312019-12-312018-12-31
Value6400000.06300000.00
Percentage of DeferredTaxLiabilitiesLeasingArrangements100.0100.00.0

us-gaap:DeferredTaxLiabilitiesPropertyPlantAndEquipment

us-gaap:DeferredTaxLiabilitiesPropertyPlantAndEquipment


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value8078625782797473696761
Percentage of DeferredTaxLiabilitiesPropertyPlantAndEquipment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DefinedBenefitPlanAccumulatedBenefitObligation us-gaap:BalanceSheetLocation, us-gaap:RetirementPlanName

us-gaap:DefinedBenefitPlanAccumulatedBenefitObligation

kalu:AccruedSalariesWagesAndRelatedExpenses, kalu:Warrick


Defined
Period End2021-03-31
Value1.1
Percentage of DefinedBenefitPlanAccumulatedBenefitObligation100.0

kalu:OtherAccruedLiabilities, kalu:WarrickRollingMill


Defined
Period End2021-03-31
Value1.0
Percentage of DefinedBenefitPlanAccumulatedBenefitObligation90.9

us-gaap:DefinedBenefitPlanAccumulatedBenefitObligation us-gaap:RetirementPlanName, us-gaap:RetirementPlanType

kalu:Warrick, us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Defined
Period End2021-03-31
Value78
Percentage of DefinedBenefitPlanAccumulatedBenefitObligation7100.0

kalu:Warrick, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2021-03-31
Value6.5
Percentage of DefinedBenefitPlanAccumulatedBenefitObligation590.9

kalu:WarrickRollingMill, us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Defined
Period End2021-03-31
Value78
Percentage of DefinedBenefitPlanAccumulatedBenefitObligation7090.9

kalu:WarrickRollingMill, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2021-03-31
Value6.7
Percentage of DefinedBenefitPlanAccumulatedBenefitObligation609.1

us-gaap:DefinedBenefitPlanAccumulatedBenefitObligation us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType

us-gaap:ForeignPlan, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value9.27.66.47.96.4
Percentage of DefinedBenefitPlanAccumulatedBenefitObligation0.00.00.00.00.0

us-gaap:DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax us-gaap:RetirementPlanName

us-gaap:DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax

kalu:SalariedVEBA


Defined
Period End2020-12-312019-12-31
Value3553
Percentage of DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax100.0100.0

us-gaap:DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType

us-gaap:ForeignPlan, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value2.11.91.51.81.4
Percentage of DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax5.93.60.00.00.0

us-gaap:DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax us-gaap:RetirementPlanName

us-gaap:DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax

kalu:SalariedVEBA


Defined
Period End2020-12-312019-12-31
Value-11.2-12.1
Percentage of DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax100.0100.0

us-gaap:DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType

us-gaap:ForeignPlan, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value-2.1-1.9-1.5-1.9-1.5
Percentage of DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax18.815.70.00.00.0

us-gaap:DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax us-gaap:RetirementPlanName

us-gaap:DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax

kalu:SalariedVEBA


Defined
Period End2020-12-312019-12-31
Value2441
Percentage of DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax100.0100.0

us-gaap:DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate us-gaap:RetirementPlanName

us-gaap:DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate

kalu:SalariedVEBA


Defined
Period End2020-12-312019-12-31
Value2.052.95
Percentage of DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate100.0100.0

us-gaap:DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate us-gaap:RetirementPlanName, us-gaap:RetirementPlanType

kalu:Warrick, us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Defined
Period End2021-03-31
Value2.97
Percentage of DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate0.0

kalu:Warrick, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2021-03-31
Value3.24
Percentage of DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate0.0

kalu:WarrickRollingMill, us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Defined
Period End2021-03-31
Value2.97
Percentage of DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate0.0

kalu:WarrickRollingMill, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2021-03-31
Value3.24
Percentage of DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate0.0

us-gaap:DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType

us-gaap:ForeignPlan, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value2.50.0310.0390.0340.038
Percentage of DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate122.01.10.00.00.0

us-gaap:DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncrease us-gaap:RetirementPlanName, us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncrease

kalu:Warrick, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2021-03-31
Value2.5
Percentage of DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncrease100.0

kalu:WarrickRollingMill, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2021-03-31
Value2.5
Percentage of DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncrease100.0

us-gaap:DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncrease us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType

us-gaap:ForeignPlan, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value3.00.030.030.030.03
Percentage of DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncrease0.00.00.00.00.0

us-gaap:DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationWeightedAverageInterestCreditingRate us-gaap:RetirementPlanName, us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationWeightedAverageInterestCreditingRate

kalu:Warrick, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2021-03-31
Value7.0
Percentage of DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationWeightedAverageInterestCreditingRate100.0

kalu:WarrickRollingMill, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2021-03-31
Value7.0
Percentage of DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationWeightedAverageInterestCreditingRate100.0

us-gaap:DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationWeightedAverageInterestCreditingRate us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType

us-gaap:ForeignPlan, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-31
Value4.450.04450.0445
Percentage of DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationWeightedAverageInterestCreditingRate0.00.00.0

us-gaap:DefinedBenefitPlanBenefitObligation us-gaap:RetirementPlanName

us-gaap:DefinedBenefitPlanBenefitObligation

kalu:SalariedVEBA


Defined
Period End2020-12-312019-12-312018-12-31
Value789085
Percentage of DefinedBenefitPlanBenefitObligation100.0100.0100.0

us-gaap:DefinedBenefitPlanBenefitObligation us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType

us-gaap:ForeignPlan, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-31
Value10.08.87.38.57.06.1
Percentage of DefinedBenefitPlanBenefitObligation12.89.88.50.00.00.0

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter


Defined
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-31
Value263131323128139125115
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter us-gaap:RetirementPlanName

kalu:SalariedVEBA


Defined
Period End2020-12-31
Value24
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter91.7

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType

us-gaap:ForeignPlan, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-31
Value2.22.01.81.9
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter8.36.45.75.9

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths


Defined
Period End2021-06-302021-03-312020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-31
Value1.71.77.08.28.37.87.27.8302723
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths us-gaap:RetirementPlanName

kalu:SalariedVEBA


Defined
Period End2020-12-31
Value6.6
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths94.3

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType

us-gaap:ForeignPlan, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-31
Value0.40.30.30.3
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths5.73.73.63.8

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive


Defined
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-31
Value6.07.17.27.17.06.7292623
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive us-gaap:RetirementPlanName

kalu:SalariedVEBA


Defined
Period End2020-12-31
Value5.6
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive93.3

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType

us-gaap:ForeignPlan, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-31
Value0.40.30.30.3
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive6.74.24.24.2

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour


Defined
Period End2021-06-302021-03-312020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-31
Value4.24.26.37.47.57.47.17.0292623
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour us-gaap:RetirementPlanName

kalu:SalariedVEBA


Defined
Period End2020-12-31
Value5.9
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour93.7

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType

us-gaap:ForeignPlan, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-31
Value0.40.30.30.4
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour6.34.14.05.4

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree


Defined
Period End2021-06-302021-03-312020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-31
Value3.43.36.57.77.87.57.27.2302723
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree us-gaap:RetirementPlanName

kalu:SalariedVEBA


Defined
Period End2020-12-31
Value6.1
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree93.8

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree us-gaap:RetirementPlanName, us-gaap:RetirementPlanType

kalu:WarrickRollingMill, us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Defined
Period End2021-06-302021-03-31
Value3.13.0
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree91.290.9

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType

us-gaap:ForeignPlan, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-31
Value0.40.30.30.3
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree6.23.93.84.0

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo


Defined
Period End2021-06-302021-03-312020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-31
Value2.62.56.87.98.17.67.37.5302723
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo us-gaap:RetirementPlanName

kalu:SalariedVEBA


Defined
Period End2020-12-31
Value6.4
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo94.1

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo us-gaap:RetirementPlanName, us-gaap:RetirementPlanType

kalu:WarrickRollingMill, us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Defined
Period End2021-06-302021-03-31
Value2.42.3
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo92.392.0

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType

us-gaap:ForeignPlan, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-31
Value0.40.30.30.3
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo5.93.83.73.9

us-gaap:DefinedBenefitPlanExpectedFutureEmployerContributionsNextFiscalYear us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanExpectedFutureEmployerContributionsNextFiscalYear

us-gaap:ForeignPlan, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-31
Value300000.0
Percentage of DefinedBenefitPlanExpectedFutureEmployerContributionsNextFiscalYear100.0

us-gaap:DefinedBenefitPlanExpectedFutureEmployerContributionsRemainderOfFiscalYear us-gaap:RetirementPlanName, us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanExpectedFutureEmployerContributionsRemainderOfFiscalYear

kalu:Warrick, us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Defined
Period End2021-03-31
Value700000.0
Percentage of DefinedBenefitPlanExpectedFutureEmployerContributionsRemainderOfFiscalYear100.0

kalu:Warrick, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2021-03-31
Value100000.0
Percentage of DefinedBenefitPlanExpectedFutureEmployerContributionsRemainderOfFiscalYear14.3

kalu:WarrickRollingMill, us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Defined
Period End2021-03-31
Value700000.0
Percentage of DefinedBenefitPlanExpectedFutureEmployerContributionsRemainderOfFiscalYear100.0

kalu:WarrickRollingMill, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2021-03-31
Value100000.0
Percentage of DefinedBenefitPlanExpectedFutureEmployerContributionsRemainderOfFiscalYear14.3

us-gaap:DefinedBenefitPlanFairValueOfPlanAssets

us-gaap:DefinedBenefitPlanFairValueOfPlanAssets


Defined
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-31
Value777068726969
Percentage of DefinedBenefitPlanFairValueOfPlanAssets100.0100.0100.0100.0100.0100.0

us-gaap:DefinedBenefitPlanFundedStatusOfPlan us-gaap:RetirementPlanName

us-gaap:DefinedBenefitPlanFundedStatusOfPlan

kalu:SalariedVEBA


Defined
Period End2020-12-312019-12-31
Value-17.8-32.6
Percentage of DefinedBenefitPlanFundedStatusOfPlan100.0100.0

us-gaap:DefinedBenefitPlanFundedStatusOfPlan us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType

us-gaap:ForeignPlan, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value-1.3-1.0-0.8-1.2-0.9
Percentage of DefinedBenefitPlanFundedStatusOfPlan7.33.10.00.00.0

us-gaap:DefinedBenefitPlanHealthCareCostTrendRateAssumedNextFiscalYear us-gaap:RetirementPlanName, us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanHealthCareCostTrendRateAssumedNextFiscalYear

kalu:Warrick, us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Defined
Period End2021-03-31
Value5.4
Percentage of DefinedBenefitPlanHealthCareCostTrendRateAssumedNextFiscalYear100.0

kalu:WarrickRollingMill, us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Defined
Period End2021-03-31
Value5.4
Percentage of DefinedBenefitPlanHealthCareCostTrendRateAssumedNextFiscalYear100.0

us-gaap:DefinedBenefitPlanPlanAssetsTargetAllocationPercentage us-gaap:DefinedBenefitPlanByPlanAssetCategories, us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanPlanAssetsTargetAllocationPercentage

us-gaap:EquitySecurities, us-gaap:ForeignPlan, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312019-12-31
Value60.00.6
Percentage of DefinedBenefitPlanPlanAssetsTargetAllocationPercentage100.0100.0

us-gaap:FixedIncomeSecurities, us-gaap:ForeignPlan, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312019-12-31
Value35.00.35
Percentage of DefinedBenefitPlanPlanAssetsTargetAllocationPercentage58.358.3

us-gaap:ShortTermInvestments, us-gaap:ForeignPlan, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312019-12-31
Value5.00.05
Percentage of DefinedBenefitPlanPlanAssetsTargetAllocationPercentage8.38.3

us-gaap:DefinedBenefitPlanUltimateHealthCareCostTrendRate1 us-gaap:RetirementPlanName, us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanUltimateHealthCareCostTrendRate1

kalu:Warrick, us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Defined
Period End2021-03-31
Value4.0
Percentage of DefinedBenefitPlanUltimateHealthCareCostTrendRate1100.0

kalu:WarrickRollingMill, us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Defined
Period End2021-03-31
Value4.0
Percentage of DefinedBenefitPlanUltimateHealthCareCostTrendRate1100.0

us-gaap:DefinedBenefitPlanWeightedAverageAssetAllocations us-gaap:DefinedBenefitPlanByPlanAssetCategories, us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanWeightedAverageAssetAllocations

us-gaap:EquitySecurities, us-gaap:ForeignPlan, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312019-12-31
Value58.00.62
Percentage of DefinedBenefitPlanWeightedAverageAssetAllocations100.0100.0

us-gaap:FixedIncomeSecurities, us-gaap:ForeignPlan, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312019-12-31
Value35.00.36
Percentage of DefinedBenefitPlanWeightedAverageAssetAllocations60.358.1

us-gaap:ShortTermInvestments, us-gaap:ForeignPlan, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312019-12-31
Value7.00.02
Percentage of DefinedBenefitPlanWeightedAverageAssetAllocations12.13.2

us-gaap:DerivativeAssetsLiabilitiesAtFairValueNet us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:HedgingDesignation, us-gaap:Position

us-gaap:DerivativeAssetsLiabilitiesAtFairValueNet

kalu:Aluminum, us-gaap:CashFlowHedging, us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring, us-gaap:DesignatedAsHedgingInstrument, us-gaap:Long


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-31
Value178.84.5-0.6-6.4-14.2-3.1
Percentage of DerivativeAssetsLiabilitiesAtFairValueNet100.0100.0100.0100.0100.0100.0100.0

kalu:Aluminum, us-gaap:CashFlowHedging, us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring, us-gaap:DesignatedAsHedgingInstrument, us-gaap:Short


Derivative
Period End2021-06-302021-03-312020-06-302020-03-312019-12-31
Value-0.3-0.10.10.10.0
Percentage of DerivativeAssetsLiabilitiesAtFairValueNet-1.7-1.1-1.6-0.7-0.0

kalu:MidwestPremiumSwapContracts, us-gaap:CashFlowHedging, us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring, us-gaap:DesignatedAsHedgingInstrument, us-gaap:Long


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-31
Value5.93.0-1.0-2.2-2.6-4.3-1.2
Percentage of DerivativeAssetsLiabilitiesAtFairValueNet34.334.1-22.2366.740.630.338.7

kalu:NaturalGas, us-gaap:CashFlowHedging, us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring, us-gaap:DesignatedAsHedgingInstrument, us-gaap:Long


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-31
Value1.5-0.8-1.3-0.7-2.5-2.9-2.8
Percentage of DerivativeAssetsLiabilitiesAtFairValueNet8.7-9.1-28.9116.739.120.490.3

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

kalu:AlloyMetalHedge, us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring, us-gaap:Nondesignated


Derivative
Period End2021-06-302021-03-312020-12-312020-09-30
Value2.72.92.60.5
Percentage of DerivativeAssetsLiabilitiesAtFairValueNet15.733.057.8-83.3

us-gaap:DerivativeAssetsLiabilitiesAtFairValueNet us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:HedgingDesignation, us-gaap:Position

kalu:AlloyMetalHedge, us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring, us-gaap:Nondesignated, us-gaap:Long


Derivative
Period End2021-06-302021-03-312020-12-312020-09-30
Value3.74.13.91.3
Percentage of DerivativeAssetsLiabilitiesAtFairValueNet21.546.686.7-216.7

kalu:AlloyMetalHedge, us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring, us-gaap:Nondesignated, us-gaap:Short


Derivative
Period End2021-06-302021-03-312020-12-312020-09-30
Value-1.0-1.2-1.3-0.8
Percentage of DerivativeAssetsLiabilitiesAtFairValueNet-5.8-13.6-28.9133.3

us-gaap:DerivativeAssetsLiabilitiesAtFairValueNet us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency

us-gaap:CashFlowHedging, us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302019-12-31
Value32121.7-3.6-7.2
Percentage of DerivativeAssetsLiabilitiesAtFairValueNet189.5146.637.8600.0232.3

us-gaap:DerivativeAssetsLiabilitiesAtFairValueNet us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency

us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value35154.3-3.1-14.4-29.0-7.2-13.7-9.5-2.5-11.62.124
Percentage of DerivativeAssetsLiabilitiesAtFairValueNet205.2179.595.6516.7225.0204.2232.30.00.00.00.00.00.0

us-gaap:DerivativeAssetsLiabilitiesAtFairValueNet us-gaap:ProductOrService, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:HedgingDesignation, us-gaap:Position

us-gaap:Electricity, us-gaap:CashFlowHedging, us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring, us-gaap:DesignatedAsHedgingInstrument, us-gaap:Long


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value8.32.0-0.5-0.1-1.51.0
Percentage of DerivativeAssetsLiabilitiesAtFairValueNet48.322.7-11.116.723.4-32.3

us-gaap:DerivativeNonmonetaryNotionalAmount us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation, us-gaap:Position

us-gaap:DerivativeNonmonetaryNotionalAmount

kalu:AlloyMetalHedge, us-gaap:DesignatedAsHedgingInstrument, us-gaap:Long


Derivative
Period End2020-09-302020-06-302020-03-312019-12-312019-09-30
Value1214161612
Percentage of DerivativeNonmonetaryNotionalAmount100.0100.0100.0100.0100.0

kalu:AlloyMetalHedge, us-gaap:DesignatedAsHedgingInstrument, us-gaap:Short


Derivative
Period End2020-09-302020-06-30
Value5.05.8
Percentage of DerivativeNonmonetaryNotionalAmount41.740.0

kalu:Aluminum, us-gaap:DesignatedAsHedgingInstrument, us-gaap:Long


Derivative
Period End2020-09-302020-06-302020-03-312019-09-30
Value809211583
Percentage of DerivativeNonmonetaryNotionalAmount667.5637.2682.2644.2

kalu:Aluminum, us-gaap:DesignatedAsHedgingInstrument, us-gaap:Short


Derivative
Period End2020-09-302020-06-302020-03-312019-09-30
Value1.00.90.80.8
Percentage of DerivativeNonmonetaryNotionalAmount8.36.24.76.2

kalu:MidwestPremiumSwapContracts, us-gaap:DesignatedAsHedgingInstrument, us-gaap:Long


Derivative
Period End2020-09-302020-06-302020-03-312019-09-30
Value799111057
Percentage of DerivativeNonmonetaryNotionalAmount659.2631.0653.3446.5

us-gaap:DerivativeNonmonetaryNotionalAmount us-gaap:DerivativeInstrumentRisk, us-gaap:Position

kalu:AlloyMetalHedge, us-gaap:Long


Derivative
Period End2021-06-302021-03-312020-12-31
Value109.110
Percentage of DerivativeNonmonetaryNotionalAmount0.00.00.0

kalu:AlloyMetalHedge, us-gaap:Short


Derivative
Period End2021-06-302021-03-312020-12-31
Value2.53.24.3
Percentage of DerivativeNonmonetaryNotionalAmount0.00.00.0

kalu:Aluminum, us-gaap:Long


Derivative
Period End2021-06-302021-03-312020-12-31
Value10711367
Percentage of DerivativeNonmonetaryNotionalAmount0.00.00.0

kalu:Aluminum, us-gaap:Short


Derivative
Period End2021-06-302021-03-312020-12-31
Value1.00.90.8
Percentage of DerivativeNonmonetaryNotionalAmount0.00.00.0

kalu:MidwestPremiumSwapContracts, us-gaap:Long


Derivative
Period End2021-06-302021-03-312020-12-31
Value806966
Percentage of DerivativeNonmonetaryNotionalAmount0.00.00.0

us-gaap:DerivativeNonmonetaryNotionalAmountPercentOfRequiredNeedCoverage us-gaap:DerivativeInstrumentRisk, us-gaap:StatementScenario

us-gaap:DerivativeNonmonetaryNotionalAmountPercentOfRequiredNeedCoverage

kalu:Electricity, us-gaap:ScenarioForecast


Derivative
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value0.180.180.540.540.55
Percentage of DerivativeNonmonetaryNotionalAmountPercentOfRequiredNeedCoverage100.0100.0100.0100.0100.0

kalu:NaturalGas, us-gaap:ScenarioForecast


Derivative
Period End2024-12-312023-12-312022-12-312021-12-312020-12-312019-12-312018-12-312017-12-312016-12-31
Value0.310.370.370.180.390.330.730.740.8
Percentage of DerivativeNonmonetaryNotionalAmountPercentOfRequiredNeedCoverage0.00.00.00.0216.7183.3135.2137.0145.5

us-gaap:Electricity, us-gaap:ScenarioForecast


Derivative
Period End2021-12-312020-12-312019-12-312018-12-31
Value0.090.540.540.53
Percentage of DerivativeNonmonetaryNotionalAmountPercentOfRequiredNeedCoverage0.0300.0300.098.1

us-gaap:DerivativeNonmonetaryNotionalAmountPercentOfRequiredNeedCoverage us-gaap:ProductOrService, us-gaap:StatementScenario

us-gaap:Electricity, srt:ScenarioForecast


Derivative
Period End2023-12-312022-12-312021-12-312020-12-31
Value15.00.490.580.59
Percentage of DerivativeNonmonetaryNotionalAmountPercentOfRequiredNeedCoverage0.00.00.0327.8

us-gaap:DerivativeNonmonetaryNotionalAmountPercentOfRequiredNeedCoverage us-gaap:StatementScenario, us-gaap:DerivativeInstrumentRisk

srt:ScenarioForecast, kalu:NaturalGas


Derivative
Period End2026-12-312025-12-312024-12-312023-12-312022-12-312021-12-312020-12-312019-12-31
Value0.250.250.770.830.830.680.680.72
Percentage of DerivativeNonmonetaryNotionalAmountPercentOfRequiredNeedCoverage0.00.00.00.00.00.0377.8400.0

srt:ScenarioForecast, us-gaap:Electricity


Derivative
Period End2022-12-312021-12-312020-12-312019-12-31
Value0.090.460.550.54
Percentage of DerivativeNonmonetaryNotionalAmountPercentOfRequiredNeedCoverage0.00.0305.6300.0

us-gaap:EmployeeRelatedLiabilitiesCurrent

us-gaap:EmployeeRelatedLiabilitiesCurrent


Employee
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value3931303334283431302840353228423934294942363339383433393733334239333339353131302826293133
Percentage of EmployeeRelatedLiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized us-gaap:AwardType

us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized

kalu:RestrictedStockAndRestrictedStockUnits


Employee
Period End2020-12-312019-12-312018-12-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-30
Value9.78.48.78.19.68.58.75.97.08.38.35.86.98.08.25.66.59.56.63.84.65.45.23.44.2
Percentage of EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PerformanceShares


Employee
Period End2020-12-312017-09-302015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-30
Value6.51.50.30.60.91.11.62.33.03.74.87.18.69.34.16.7
Percentage of EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized67.015.65.28.711.213.428.635.431.656.1126.3154.3159.3178.8120.6159.5

us-gaap:ExcessOfReplacementOrCurrentCostsOverStatedLIFOValue

us-gaap:ExcessOfReplacementOrCurrentCostsOverStatedLIFOValue


Excess
Period End2021-06-302021-03-312020-12-312020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value73248.41.911171217314224
Percentage of ExcessOfReplacementOrCurrentCostsOverStatedLIFOValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FinanceLeaseLiability

us-gaap:FinanceLeaseLiability


Finance
Period End2021-06-302021-03-312020-12-312020-09-30
Value8900000.09600000.08100000.07600000.0
Percentage of FinanceLeaseLiability100.0100.0100.0100.0

us-gaap:FinanceLeaseLiabilityCurrent

us-gaap:FinanceLeaseLiabilityCurrent


Finance
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-31
Value2000000.02000000.01900000.01600000.01300000.01200000.01200000.0
Percentage of FinanceLeaseLiabilityCurrent100.0100.0100.0100.0100.0100.0100.0

us-gaap:FinanceLeaseLiabilityNoncurrent

us-gaap:FinanceLeaseLiabilityNoncurrent


Finance
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-31
Value6900000.07600000.06200000.06000000.04800000.05100000.05400000.0
Percentage of FinanceLeaseLiabilityNoncurrent100.0100.0100.0100.0100.0100.0100.0

us-gaap:FinanceLeaseLiabilityPaymentsDue

us-gaap:FinanceLeaseLiabilityPaymentsDue


Finance
Period End2021-06-302021-03-312020-12-312020-09-30
Value14148.98.5
Percentage of FinanceLeaseLiabilityPaymentsDue100.0100.0100.0100.0

us-gaap:FinanceLeaseLiabilityPaymentsDueAfterYearFive

us-gaap:FinanceLeaseLiabilityPaymentsDueAfterYearFive


Finance
Period End2020-12-31
Value800000.0
Percentage of FinanceLeaseLiabilityPaymentsDueAfterYearFive100.0

us-gaap:FinanceLeaseLiabilityPaymentsDueNextTwelveMonths

us-gaap:FinanceLeaseLiabilityPaymentsDueNextTwelveMonths


Finance
Period End2021-06-302021-03-312020-12-312020-09-30
Value2000000.02100000.02200000.01900000.0
Percentage of FinanceLeaseLiabilityPaymentsDueNextTwelveMonths100.0100.0100.0100.0

us-gaap:FinanceLeaseLiabilityPaymentsDueYearFive

us-gaap:FinanceLeaseLiabilityPaymentsDueYearFive


Finance
Period End2020-12-31
Value1000000.0
Percentage of FinanceLeaseLiabilityPaymentsDueYearFive100.0

us-gaap:FinanceLeaseLiabilityPaymentsDueYearFour

us-gaap:FinanceLeaseLiabilityPaymentsDueYearFour


Finance
Period End2021-06-302021-03-312020-12-312020-09-30
Value800000.01100000.01200000.01100000.0
Percentage of FinanceLeaseLiabilityPaymentsDueYearFour100.0100.0100.0100.0

us-gaap:FinanceLeaseLiabilityPaymentsDueYearThree

us-gaap:FinanceLeaseLiabilityPaymentsDueYearThree


Finance
Period End2021-06-302021-03-312020-12-312020-09-30
Value1200000.01300000.01700000.01500000.0
Percentage of FinanceLeaseLiabilityPaymentsDueYearThree100.0100.0100.0100.0

us-gaap:FinanceLeaseLiabilityPaymentsDueYearTwo

us-gaap:FinanceLeaseLiabilityPaymentsDueYearTwo


Finance
Period End2021-06-302021-03-312020-12-312020-09-30
Value1600000.01800000.02000000.01600000.0
Percentage of FinanceLeaseLiabilityPaymentsDueYearTwo100.0100.0100.0100.0

us-gaap:FinanceLeaseLiabilityPaymentsRemainderOfFiscalYear

us-gaap:FinanceLeaseLiabilityPaymentsRemainderOfFiscalYear


Finance
Period End2021-06-302021-03-312020-09-30
Value2300000.01800000.0500000.0
Percentage of FinanceLeaseLiabilityPaymentsRemainderOfFiscalYear100.0100.0100.0

us-gaap:FinanceLeaseLiabilityUndiscountedExcessAmount

us-gaap:FinanceLeaseLiabilityUndiscountedExcessAmount


Finance
Period End2021-06-302021-03-312020-12-312020-09-30
Value5100000.05100000.0800000.0900000.0
Percentage of FinanceLeaseLiabilityUndiscountedExcessAmount100.0100.0100.0100.0

us-gaap:FinanceLeaseRightOfUseAsset

us-gaap:FinanceLeaseRightOfUseAsset


Finance
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-31
Value8900000.09600000.08100000.07600000.06100000.06300000.06600000.0
Percentage of FinanceLeaseRightOfUseAsset100.0100.0100.0100.0100.0100.0100.0

us-gaap:FinanceLeaseWeightedAverageDiscountRatePercent

us-gaap:FinanceLeaseWeightedAverageDiscountRatePercent


Finance
Period End2021-06-302021-03-312020-12-312020-09-30
Value3.53.53.94.2
Percentage of FinanceLeaseWeightedAverageDiscountRatePercent100.0100.0100.0100.0

us-gaap:FiniteLivedIntangibleAssetsAccumulatedAmortization

us-gaap:FiniteLivedIntangibleAssetsAccumulatedAmortization


Finite
Period End2020-12-312019-12-312018-12-312017-12-312013-12-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value1714119.76.04.33.83.42.92.51.91.40.3
Percentage of FiniteLivedIntangibleAssetsAccumulatedAmortization100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FiniteLivedIntangibleAssetsAccumulatedAmortization us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:CustomerRelationships


Finite
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value1412119.79.58.06.44.83.22.82.52.01.71.30.90.1
Percentage of FiniteLivedIntangibleAssetsAccumulatedAmortization82.688.896.5100.00.00.00.080.074.473.773.569.068.068.464.333.3

us-gaap:NoncompeteAgreements


Finite
Period End2020-12-312019-12-312018-12-31
Value2.41.30.3
Percentage of FiniteLivedIntangibleAssetsAccumulatedAmortization14.09.12.6

us-gaap:TradeNames


Finite
Period End2020-12-312019-12-312018-12-31
Value0.60.30.1
Percentage of FiniteLivedIntangibleAssetsAccumulatedAmortization3.52.10.9

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive


Finite
Period End2020-12-31
Value14
Percentage of FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive100.0

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths


Finite
Period End2020-12-31
Value2800000.0
Percentage of FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths100.0

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearFive

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearFive


Finite
Period End2020-12-31
Value1800000.0
Percentage of FiniteLivedIntangibleAssetsAmortizationExpenseYearFive100.0

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearFour

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearFour


Finite
Period End2020-12-31
Value1800000.0
Percentage of FiniteLivedIntangibleAssetsAmortizationExpenseYearFour100.0

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearThree

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearThree


Finite
Period End2020-12-31
Value2600000.0
Percentage of FiniteLivedIntangibleAssetsAmortizationExpenseYearThree100.0

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo


Finite
Period End2020-12-31
Value2800000.0
Percentage of FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo100.0

us-gaap:FiniteLivedIntangibleAssetsGross

us-gaap:FiniteLivedIntangibleAssetsGross


Finite
Period End2020-12-312019-12-312018-12-312017-12-312013-12-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value4343433439393939393939394.3
Percentage of FiniteLivedIntangibleAssetsGross100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FiniteLivedIntangibleAssetsGross us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:CustomerRelationships


Finite
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value3636363438383838383838383838383.8
Percentage of FiniteLivedIntangibleAssetsGross82.282.282.2100.00.00.00.097.097.097.097.097.097.097.097.088.4

us-gaap:GoodwillGross

us-gaap:GoodwillGross


Goodwill
Period End2021-06-302021-03-312020-12-312019-12-312018-12-312018-09-302017-12-312016-12-312015-12-31
Value576437626261373737
Percentage of GoodwillGross100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:GoodwillGross us-gaap:BusinessAcquisition

kalu:AlcoaWarrickLLC


Goodwill
Period End2021-06-302021-03-31
Value2027
Percentage of GoodwillGross35.542.4

us-gaap:GoodwillImpairedAccumulatedImpairmentLoss

us-gaap:GoodwillImpairedAccumulatedImpairmentLoss


Goodwill
Period End2021-06-302021-03-312020-12-312019-12-312018-12-312018-09-302017-12-312016-12-312015-12-312014-12-312013-12-312012-12-31
Value181818431818180.00.00.00.00.0
Percentage of GoodwillImpairedAccumulatedImpairmentLoss100.0100.0100.0100.0100.0100.0100.00.00.00.00.00.0

us-gaap:InterestPayableCurrent

us-gaap:InterestPayableCurrent


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value10111111112.02.38.42.98.42.98.42.98.42.98.42.98.42.98.63.15.51.56.21.7103.7103.6103.7103.7103.7104.14.42.34.02.12.1
Percentage of InterestPayableCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InventoryRawMaterials

us-gaap:InventoryRawMaterials


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
Value15511762557155656381747576736861565354515649465349605554565351475054525346524658584450
Percentage of InventoryRawMaterials100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InventoryWorkInProcess

us-gaap:InventoryWorkInProcess


Inventory
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value160178466162896380981048573616378868175717378736382707166706466757069685566666957606449
Percentage of InventoryWorkInProcess100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths


Lessee
Period End2021-06-302021-03-312020-12-312020-09-30
Value9500000.08900000.05900000.05800000.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths100.0100.0100.0100.0

us-gaap:LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear

us-gaap:LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear


Lessee
Period End2021-06-302021-03-312020-09-30
Value5100000.07300000.01500000.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear100.0100.0100.0

us-gaap:LettersOfCreditOutstandingAmount us-gaap:CreditFacility

us-gaap:LettersOfCreditOutstandingAmount

us-gaap:RevolvingCreditFacility


Letters
Period End2021-06-302021-03-312020-12-312020-09-30
Value7700000.07800000.07800000.07700000.0
Percentage of LettersOfCreditOutstandingAmount100.0100.0100.0100.0

us-gaap:LineOfCreditFacilityCurrentBorrowingCapacity us-gaap:CreditFacility

us-gaap:LineOfCreditFacilityCurrentBorrowingCapacity

us-gaap:RevolvingCreditFacility


Line
Period End2021-06-302021-03-312020-12-312020-09-30
Value375375259261
Percentage of LineOfCreditFacilityCurrentBorrowingCapacity100.0100.0100.0100.0

us-gaap:LineOfCreditFacilityRemainingBorrowingCapacity us-gaap:CreditFacility

us-gaap:LineOfCreditFacilityRemainingBorrowingCapacity

us-gaap:RevolvingCreditFacility


Line
Period End2021-06-302021-03-312020-12-312020-09-30
Value367367251253
Percentage of LineOfCreditFacilityRemainingBorrowingCapacity100.0100.0100.0100.0

us-gaap:LossContingencyRangeOfPossibleLossPortionNotAccrued

us-gaap:LossContingencyRangeOfPossibleLossPortionNotAccrued


Loss
Period End2021-06-302021-03-312020-12-312020-09-302016-12-312016-09-302016-06-30
Value11111111121224
Percentage of LossContingencyRangeOfPossibleLossPortionNotAccrued100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingLeaseWeightedAverageDiscountRatePercent

us-gaap:OperatingLeaseWeightedAverageDiscountRatePercent


Operating
Period End2021-06-302021-03-312020-12-312020-09-30
Value4.14.25.45.4
Percentage of OperatingLeaseWeightedAverageDiscountRatePercent100.0100.0100.0100.0

us-gaap:OperatingLossCarryforwards

us-gaap:OperatingLossCarryforwards


Operating
Period End2020-12-31
Value94
Percentage of OperatingLossCarryforwards100.0

us-gaap:OtherAssetsFairValueDisclosure us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency

us-gaap:OtherAssetsFairValueDisclosure

us-gaap:FairValueInputsLevel1, us-gaap:FairValueMeasurementsRecurring


Other
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-31
Value7807507101992829322922231817231730233740
Percentage of OtherAssetsFairValueDisclosure100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherAssetsFairValueDisclosure us-gaap:FairValueByMeasurementFrequency

us-gaap:FairValueMeasurementsRecurring


Other
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-31
Value780750710346343197146137162182235218234265232229286102
Percentage of OtherAssetsFairValueDisclosure100.0100.0100.0173.61216.3673.7455.9469.6708.7787.51303.31264.7999.11533.5758.3978.3755.1254.3

us-gaap:OtherInventorySupplies

us-gaap:OtherInventorySupplies


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
Value7.76.16.57.26.66.56.56.97.47.16.55.35.24.84.54.44.65.15.02423232322222120192018181817171616151414131313
Percentage of OtherInventorySupplies100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherReceivables

us-gaap:OtherReceivables


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312010-12-31
Value383111222222182625222524181815151011117.38.28.66.14.45.98.810101111131411113.41.71.91.31.25.2
Percentage of OtherReceivables100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherSundryLiabilitiesNoncurrent

us-gaap:OtherSundryLiabilitiesNoncurrent


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312018-12-312017-12-31
Value303232333434272721
Percentage of OtherSundryLiabilitiesNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RestrictedCashAndCashEquivalentsNoncurrent

us-gaap:RestrictedCashAndCashEquivalentsNoncurrent


Restricted
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value131314141413141414131314141212121312121111101010101010.010.09.39.39.39.39.310.010.010101010109.416
Percentage of RestrictedCashAndCashEquivalentsNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RestructuringReserve

us-gaap:RestructuringReserve


Restructuring
Period End2020-12-312020-09-302011-09-302011-06-302010-12-31
Value1400000.06900000.00200000.0400000.0
Percentage of RestructuringReserve100.0100.00.0100.0100.0

us-gaap:RestructuringReserve us-gaap:RestructuringPlan

kalu:TwoThousandAndTwentyRestructuringPlan


Restructuring
Period End2021-03-312020-12-31
Value300000.01400000.0
Percentage of RestructuringReserve0.0100.0

us-gaap:SelfInsuranceReserveNoncurrent

us-gaap:SelfInsuranceReserveNoncurrent


Self
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value313030302928272625252424232322252424252324242120202121232423232223232420202020171615
Percentage of SelfInsuranceReserveNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue us-gaap:AwardType

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue

kalu:RestrictedStockAndRestrictedStockUnits


Share
Period End2020-12-312019-12-31
Value72.2295.28
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue100.0100.0

us-gaap:PerformanceShares


Share
Period End2020-12-312019-12-312018-12-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302011-12-31
Value102.32100.6993.7280.0879.6979.6979.69000057.7657.7557.7557.7550.3550.3550.4350.4949.2649.2649.1349.0841.7841.7826.84
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue141.7105.70.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:SharePrice us-gaap:AwardType

us-gaap:SharePrice

kalu:MarketBasedShares


Share
Period End2020-12-312019-12-312018-12-31
Value91.22108.79101.66
Percentage of SharePrice100.0100.0100.0

us-gaap:StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1

us-gaap:StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1


Stock
Period End2021-06-302021-03-312020-12-312020-09-302018-12-312017-12-312017-03-312016-12-312015-12-312015-03-312014-12-312013-12-31
Value9393939314811055881234272117
Percentage of StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:TaxCreditCarryforwardAmount us-gaap:TaxCreditCarryforward

us-gaap:TaxCreditCarryforwardAmount

us-gaap:Research


Tax
Period End2020-12-312019-12-31
Value8100000.07700000.0
Percentage of TaxCreditCarryforwardAmount100.0100.0

us-gaap:UnamortizedDebtIssuanceExpense us-gaap:DebtInstrument, us-gaap:LongtermDebtType

us-gaap:UnamortizedDebtIssuanceExpense

kalu:SeniorNotesDueTwoThousandAndTwentyEight, us-gaap:SeniorNotes


Unamortized
Period End2021-06-302021-03-312020-12-312020-09-302020-06-30
Value6000000.06300000.06500000.06700000.07000000.0
Percentage of UnamortizedDebtIssuanceExpense100.0100.0100.0100.0100.0

kalu:SeniorNotesDueTwoThousandAndTwentyFive, us-gaap:SeniorNotes


Unamortized
Period End2021-05-212021-03-312020-12-312020-09-302020-06-30
Value5000000.05000000.05400000.05600000.05900000.0
Percentage of UnamortizedDebtIssuanceExpense0.079.483.183.684.3

kalu:UnsecuredSeniorNotesDueJuneOneTwoThousandAndThirtyOne, us-gaap:SeniorNotes


Unamortized
Period End2021-06-30
Value8500000.0
Percentage of UnamortizedDebtIssuanceExpense141.7

us-gaap:UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued

us-gaap:UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued


Unrecognized
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value300000.0300000.0200000.0100000.0200000.0200000.01400000.02300000.07500000.07400000.06900000.06900000.06600000.06400000.07100000.06600000.0
Percentage of UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate

us-gaap:UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate


Unrecognized
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Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-31
Value1.51.51.50.40.40.40.90.60.60.40.40.40.40.40.40.41.80.70.70.60.60.60.50.51.01.12.62.62.75.87.57.714
Percentage of UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0