WST


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

Table of contents



us-gaap:CommonStockValue
us-gaap:StatementEquityComponents
us-gaap:SharesIssued

us-gaap:CommonStockSharesIssued

us-gaap:CommonStockSharesAuthorized

us-gaap:CommonStockSharesOutstanding

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic

us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount

us-gaap:EarningsPerShareBasic

us-gaap:EarningsPerShareDiluted

us-gaap:AllocatedShareBasedCompensationExpense

us-gaap:ComprehensiveIncomeNetOfTax

us-gaap:CostOfGoodsAndServicesSold
us-gaap:DerivativeInstrumentRisk, us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents
us-gaap:ConsolidationItems
us-gaap:GeneralAndAdministrativeExpense

us-gaap:GrossProfit

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents

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

us-gaap:InterestExpense

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

us-gaap:NonoperatingIncomeExpense

us-gaap:OperatingIncomeLoss
us-gaap:ConsolidationItems
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
us-gaap:DerivativeInstrumentRisk, us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents
us-gaap:OtherIncome

us-gaap:OtherNonoperatingIncomeExpense

us-gaap:ResearchAndDevelopmentExpense

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax
us-gaap:ConsolidationItems
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
us-gaap:DerivativeInstrumentRisk, us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents

us-gaap:Revenues
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:SellingGeneralAndAdministrativeExpense

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

us-gaap:Liabilities

us-gaap:LiabilitiesAndStockholdersEquity

us-gaap:StockholdersEquity
us-gaap:StatementEquityComponents

us-gaap:AssetsCurrent

us-gaap:CashAndCashEquivalentsAtCarryingValue

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents

us-gaap:AccountsReceivableNetCurrent

us-gaap:InventoryNet

us-gaap:OtherAssetsCurrent

us-gaap:NoncurrentAssets
us-gaap:StatementGeographical

us-gaap:PropertyPlantAndEquipmentGross
us-gaap:PropertyPlantAndEquipmentByType

us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
us-gaap:BusinessAcquisition
us-gaap:AmortizationOfIntangibleAssets
us-gaap:ConsolidationItems

us-gaap:PropertyPlantAndEquipmentNet

us-gaap:InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures

us-gaap:Goodwill
us-gaap:StatementBusinessSegments

us-gaap:IntangibleAssetsNetExcludingGoodwill

us-gaap:FiniteLivedIntangibleAssetsNet
us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:DeferredTaxAssetsLiabilitiesNet

us-gaap:OperatingLeaseRightOfUseAsset

us-gaap:OtherAssetsNoncurrent

us-gaap:AccountsPayableCurrent

us-gaap:AccruedIncomeTaxesCurrent

us-gaap:DebtCurrent

us-gaap:DividendsPayableCurrent

us-gaap:LiabilitiesCurrent
us-gaap:LongtermDebtType
us-gaap:LongTermDebtCurrent

us-gaap:OperatingLeaseLiabilityCurrent

us-gaap:OtherLiabilitiesCurrent

us-gaap:LongTermDebt

us-gaap:LongTermDebtNoncurrent
us-gaap:LongtermDebtType

us-gaap:DeferredIncomeTaxLiabilitiesNet

us-gaap:PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent
us-gaap:RetirementPlanType

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:CommonStockValue

us-gaap:AdditionalPaidInCapital

us-gaap:RetainedEarningsAccumulatedDeficit

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax

us-gaap:TreasuryStockValue

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect

us-gaap:IncreaseDecreaseInOtherOperatingCapitalNet

us-gaap:NetCashProvidedByUsedInOperatingActivities

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

us-gaap:ShareBasedCompensation
us-gaap:ConsolidationItems

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:PaymentsToAcquirePropertyPlantAndEquipment

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:PaymentsOfDividendsCommonStock

us-gaap:PaymentsForRepurchaseOfCommonStock

us-gaap:EffectiveIncomeTaxRateContinuingOperations

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice

us-gaap:DeferredTaxAssetsNet

us-gaap:UnrecognizedTaxBenefits

us-gaap:DeferredTaxAssetsValuationAllowance

us-gaap:AdjustmentForAmortization

us-gaap:BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1
us-gaap:IncomeStatementLocation
us-gaap:ChangeInUnrealizedGainLossOnFairValueHedgingInstruments1
us-gaap:IncomeStatementLocation
us-gaap:ChangeInUnrealizedGainLossOnHedgedItemInFairValueHedge1
us-gaap:ConcentrationRiskByBenchmark, us-gaap:ConcentrationRiskByType
us-gaap:ConcentrationRiskPercentage1
us-gaap:MajorCustomers, us-gaap:ConcentrationRiskByBenchmark, us-gaap:ConcentrationRiskByType
us-gaap:ProductOrService, us-gaap:ConcentrationRiskByBenchmark, us-gaap:ConcentrationRiskByType
us-gaap:StatementGeographical, us-gaap:ConcentrationRiskByBenchmark, us-gaap:ConcentrationRiskByType

us-gaap:ContractWithCustomerLiabilityChangeInTimeframePerformanceObligationSatisfiedRevenueRecognized

us-gaap:ContractWithCustomerLiabilityRevenueRecognized

us-gaap:DefinedBenefitPlanActuarialGainLoss
us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents
us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanAmortizationOfPriorServiceCostCredit
us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents
us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanExpectedReturnOnPlanAssets
us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanInterestCost
us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost
us-gaap:RetirementPlanSponsorLocation
us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType
us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1
us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents
us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanServiceCost
us-gaap:RetirementPlanType

us-gaap:Depreciation
us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship
us-gaap:DerivativeExcludedComponentGainLossRecognizedInEarnings
us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation, us-gaap:IncomeStatementLocation
us-gaap:DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet
us-gaap:HedgingDesignation

us-gaap:DividendsCommonStockCash
us-gaap:StatementEquityComponents

us-gaap:EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents
us-gaap:Range, us-gaap:RestructuringPlan
us-gaap:EffectOnFutureEarningsAmount

us-gaap:EffectiveIncomeTaxRateReconciliationShareBasedCompensationExcessTaxBenefitAmount

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements

us-gaap:ForeignCurrencyTransactionGainLossBeforeTax
us-gaap:IncomeStatementLocation
us-gaap:GainLossFromComponentsExcludedFromAssessmentOfFairValueHedgeEffectivenessNet
us-gaap:IncomeStatementLocation
us-gaap:GainLossOnDerivativeInstrumentsNetPretax

us-gaap:GainLossOnFairValueHedgesRecognizedInEarnings

us-gaap:IncomeLossFromEquityMethodInvestments

us-gaap:IncrementalCommonSharesAttributableToShareBasedPaymentArrangements

us-gaap:InvestmentIncomeNet

us-gaap:LeaseCost

us-gaap:OciBeforeReclassificationsNetOfTaxAttributableToParent
us-gaap:StatementEquityComponents

us-gaap:OperatingLeaseCost

us-gaap:OperatingLeasePayments

us-gaap:OtherAssetImpairmentCharges

us-gaap:OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent

us-gaap:OtherComprehensiveIncomeDefinedBenefitPlansTaxPortionAttributableToParent

us-gaap:OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationTaxParent
us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:IncomeStatementLocation
us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax
us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship
us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:IncomeStatementLocation
us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeReclassificationForDiscontinuanceBeforeTax
us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship
us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:IncomeStatementLocation
us-gaap:OtherComprehensiveIncomeLossNetInvestmentHedgeGainLossBeforeReclassificationAndTax
us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship
us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:IncomeStatementLocation
us-gaap:OtherComprehensiveIncomeLossNetInvestmentHedgeGainLossReclassificationBeforeTax
us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship

us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
us-gaap:StatementEquityComponents

us-gaap:OtherNoncashIncomeExpense

us-gaap:OtherOperatingIncomeExpenseNet

us-gaap:PaymentForContingentConsiderationLiabilityOperatingActivities

us-gaap:PaymentsForProceedsFromOtherInvestingActivities
us-gaap:RestructuringCostAndReserve, us-gaap:RestructuringPlan
us-gaap:PaymentsForRestructuring
us-gaap:RestructuringPlan

us-gaap:PaymentsRelatedToTaxWithholdingForShareBasedCompensation

us-gaap:PaymentsToAcquireIntangibleAssets

us-gaap:ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlans

us-gaap:ProceedsFromStockOptionsExercised

us-gaap:ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent
us-gaap:StatementEquityComponents

us-gaap:RepaymentsOfOtherLongTermDebt

us-gaap:RestructuringAndRelatedCostIncurredCost
us-gaap:ConsolidationItems
us-gaap:RestructuringCharges
us-gaap:RestructuringCostAndReserve, us-gaap:RestructuringPlan
us-gaap:RestructuringPlan

us-gaap:RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability

us-gaap:SeveranceCosts1
us-gaap:AwardType
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue

us-gaap:ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice

us-gaap:ShortTermLeaseCost
us-gaap:StatementEquityComponents
us-gaap:StockIssuedDuringPeriodSharesShareBasedCompensation

us-gaap:StockIssuedDuringPeriodValueShareBasedCompensation
us-gaap:StatementEquityComponents

us-gaap:TreasuryStockAcquiredAverageCostPerShare
us-gaap:StatementEquityComponents
us-gaap:TreasuryStockSharesAcquired

us-gaap:TreasuryStockValueAcquiredCostMethod
us-gaap:StatementEquityComponents

us-gaap:VariableLeaseCost

wst:ContractWithCustomerAssetIncreaseDecrease

wst:CostInvestmentImpairment
us-gaap:ConsolidationItems

wst:DevelopmentAndLicensingIncome
us-gaap:NatureOfExpense

wst:IncomeTaxBenefitFromStockBasedCompensation

wst:IncomeTaxBenefitFromStockBasedCompensationImpactOnDilutedEarningsPerShare

wst:OtherIncomeExpense

wst:PaymentsToAcquireIntangibleAssetsImpactOnDilutedEarningsPerShare

wst:PensionSettlementAndRelatedCharges

wst:PensionSettlementAndRelatedChargesImpactOnDilutedEarningsPerShare

wst:PensionSettlementCharge

wst:PurchasesAndRoyaltyPaymentsFromEquityMethodInvestees

wst:RestructuringAndSeveranceRelatedCharges

wst:RestructuringAndSeveranceRelatedChargesImpactOnDilutedEarningsPerShare

wst:SalesToEquityMethodInvestees

dei:EntityCommonStockSharesOutstanding

us-gaap:AccrualForTaxesOtherThanIncomeTaxesCurrent

us-gaap:AccruedProfessionalFeesCurrent

us-gaap:AccruedSalesCommissionCurrentAndNoncurrent

us-gaap:AllowanceForDoubtfulAccountsReceivableCurrent

us-gaap:AssetsFairValueDisclosure
us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh

us-gaap:BusinessCombinationContingentConsiderationLiability
us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:ContractWithCustomerAssetNet

us-gaap:ContractWithCustomerLiability
us-gaap:ProductOrService
us-gaap:ProductOrService
us-gaap:ContractWithCustomerLiabilityNoncurrent

us-gaap:DebtInstrumentCarryingAmount
us-gaap:LongtermDebtType

us-gaap:DeferredCompensationLiabilityClassifiedNoncurrent
us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:DeferredCompensationPlanAssets
us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:DeferredIncomeTaxAssetsNet

us-gaap:DeferredIncomeTaxLiabilities

us-gaap:DeferredRevenueCurrent

us-gaap:DeferredTaxAssetsOperatingLossCarryforwards

us-gaap:DeferredTaxAssetsOperatingLossCarryforwardsForeign
us-gaap:IncomeTaxAuthority
us-gaap:DeferredTaxAssetsOperatingLossCarryforwardsNotSubjectToExpiration

us-gaap:DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal

us-gaap:DeferredTaxAssetsOther

us-gaap:DeferredTaxAssetsTaxCreditCarryforwards

us-gaap:DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits

us-gaap:DeferredTaxLiabilitiesOther

us-gaap:DeferredTaxLiabilitiesPropertyPlantAndEquipment

us-gaap:DeferredTaxLiabilitiesUndistributedForeignEarnings

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

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

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter
us-gaap:RetirementPlanSponsorLocation

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths
us-gaap:RetirementPlanSponsorLocation

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive
us-gaap:RetirementPlanSponsorLocation

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour
us-gaap:RetirementPlanSponsorLocation

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree
us-gaap:RetirementPlanSponsorLocation

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo
us-gaap:RetirementPlanSponsorLocation

us-gaap:DefinedBenefitPlanExpectedFutureEmployerContributionsNextFiscalYear
us-gaap:RetirementPlanSponsorLocation

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

us-gaap:DefinedBenefitPlanHealthCareCostTrendRateAssumedNextFiscalYear

us-gaap:DefinedBenefitPlanUltimateHealthCareCostTrendRate1
us-gaap:DefinedBenefitPlanByPlanAssetCategories
us-gaap:DefinedBenefitPlanWeightedAverageAssetAllocations
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FinancialInstrument
us-gaap:DerivativeAssets
us-gaap:FinancialInstrument
us-gaap:DerivativeInstrumentRisk
us-gaap:DerivativeAveragePriceRiskOptionStrikePrice

us-gaap:DerivativeLiabilitiesCurrent
us-gaap:Currency, us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation, us-gaap:Position
us-gaap:DerivativeNotionalAmount

us-gaap:DueFromAffiliates

us-gaap:DueToAffiliateCurrentAndNoncurrent

us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName
us-gaap:EquityMethodInvestmentOwnershipPercentage

us-gaap:EquityMethodInvestments

us-gaap:EquitySecuritiesWithoutReadilyDeterminableFairValueAmount

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue

us-gaap:FiniteLivedIntangibleAssetsAccumulatedAmortization
us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearFive

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearFour

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearThree

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo

us-gaap:FiniteLivedIntangibleAssetsGross
us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:ForeignCurrencyContractAssetFairValueDisclosure
us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FinancialInstrument
us-gaap:FinancialInstrument
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FinancialInstrument
us-gaap:ForeignCurrencyContractsLiabilityFairValueDisclosure
us-gaap:FinancialInstrument

us-gaap:InterestPayableCurrent

us-gaap:InventoryFinishedGoodsNetOfReserves

us-gaap:InventoryRawMaterialsNetOfReserves

us-gaap:InventoryWorkInProcessNetOfReserves

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths

us-gaap:LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear

us-gaap:LiabilitiesFairValueDisclosure
us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:CreditFacility, us-gaap:LongtermDebtType
us-gaap:LineOfCredit
us-gaap:LongtermDebtType
us-gaap:LineOfCreditFacilityCurrentBorrowingCapacity
us-gaap:LongtermDebtType
us-gaap:LineOfCreditFacilityRemainingBorrowingCapacity

us-gaap:LongTermDebtFairValue

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo
us-gaap:LossContingenciesByNatureOfContingency
us-gaap:LossContingencyAccrualAtCarryingValue
us-gaap:LossContingenciesByNatureOfContingency
us-gaap:LossContingencyReceivable

us-gaap:OperatingLeaseWeightedAverageDiscountRatePercent
us-gaap:IncomeTaxAuthority
us-gaap:OperatingLossCarryforwards
us-gaap:IncomeTaxAuthority, wst:ExpirationPeriod

us-gaap:OtherDeferredCompensationArrangementsLiabilityClassifiedNoncurrent
us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:OtherEmployeeRelatedLiabilitiesCurrent

us-gaap:OtherPostretirementBenefitsPayableCurrentAndNoncurrent

us-gaap:OtherSundryLiabilitiesCurrent

us-gaap:PensionAndOtherPostretirementDefinedBenefitPlansCurrentLiabilities
us-gaap:RetirementPlanType
us-gaap:RetirementPlanType
us-gaap:PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesCurrentAndNoncurrent
us-gaap:RestructuringPlan
us-gaap:RestructuringAndRelatedCostCostIncurredToDate1
us-gaap:Range, us-gaap:RestructuringPlan
us-gaap:RestructuringAndRelatedCostExpectedCost1

us-gaap:RestructuringReserve
us-gaap:RestructuringCostAndReserve, us-gaap:RestructuringPlan
us-gaap:RestructuringPlan

us-gaap:RetainedEarningsUndistributedEarningsFromEquityMethodInvestees
us-gaap:AwardType
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableAggregateIntrinsicValue

us-gaap:SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleAmountOfUnrecordedBenefit
us-gaap:IncomeTaxAuthority, us-gaap:TaxCreditCarryforward
us-gaap:TaxCreditCarryforwardAmount

us-gaap:TransferOfFinancialAssetsAccountedForAsSalesCashProceedsReceivedForAssetsDerecognizedAmount

us-gaap:TreasuryStockShares

us-gaap:UnamortizedDebtIssuanceExpense
us-gaap:LongtermDebtType

us-gaap:UndistributedEarningsOfForeignSubsidiaries

us-gaap:UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued

us-gaap:UnrecordedUnconditionalPurchaseObligationBalanceOnFirstAnniversary

us-gaap:UnrecordedUnconditionalPurchaseObligationBalanceSheetAmount

us-gaap:ValuationAllowancesAndReservesBalance
us-gaap:ValuationAllowancesAndReservesType

wst:AccruedSalariesWagesAndBenefitsCurrent
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName
wst:AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentAndCumulativeChangesInNetGainLossFromCashFlowHedgesEffect
us-gaap:RetirementPlanType
wst:AssetsDefinedBenefitPlansNoncurrent
us-gaap:MeasurementInputType
wst:BusinessCombinationContingentConsiderationMeasurementInput
us-gaap:Range, us-gaap:MeasurementInputType
us-gaap:LongtermDebtType
wst:CreditAvailableForIssuanceOfLettersOfCredit

wst:DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsRestructuringAndImpairmentCharges

wst:DefinedBenefitPlanExpectedFutureBenefitPayments
us-gaap:RetirementPlanSponsorLocation

wst:LesseeOperatingLeaseLiabilityToBePaidAfterYearFour
us-gaap:LongtermDebtType
wst:LineOfCreditFacilityAdditionalBorrowingCapacity

wst:NotesPayableAndOtherDebtCurrent
us-gaap:AwardType
wst:ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumEmployeeSubscriptionRateAmount
us-gaap:AwardType
wst:ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingWeightedAverageExercisePrice
us-gaap:AwardType
wst:ShareBasedCompensationArrangementsByShareBasedPaymentAwardNonOptionEquityInstrumentsExercisableWeightedAverageExercisePrice

Plots across concepts


IncomeStatement
Comprehensive Income Net Of Tax
Expenses
Other Nonoperating Income Expense
Balance Sheet
Intangible Assets Net Excluding Goodwill
Assets
Operating Lease Right Of Use Asset
Current Assets
Other Assets Current
NonCurrent Assets
Other Assets Noncurrent
PropertyPlantAndEquipmentNet
Property Plant And Equipment Net
Liabilities
Operating Lease Liability
Current Liabilities
Long Term Debt Current
Noncurrent Liabilities
Deferred Income Tax Liabilities Net
Stockholders Equity
Accumulated Other Comprehensive Income Loss Net Of Tax
CashFlow
Net Cash Provided By Used In Financing Activities
NetCashProvidedByUsedInOperatingActivities
Share Based Compensation
NetCashProvidedByUsedInInvestingActivities
Net Cash Provided By Used In Investing Activities
NetCashProvidedByUsedInFinancingActivities
Net Cash Provided By Used In Financing Activities
Shares
Treasury Stock Shares
DividendsAndRepurchase
Dividends Common Stock Cash
OperatingLeaseLiability
Operating Lease Liability Current
NonoperatingIncomeExpense
Nonoperating Income Expense
LesseeOperatingLeaseLiabilityPaymentsDue
Lessee Operating Lease Liability Payments Due Year Four
FiniteLivedIntangibleAssets
Finite Lived Intangible Assets Net
InventoryNet
Inventory Work In Process Net Of Reserves
AccountsReceivable
Allowance For Doubtful Accounts Receivable Current

Tables

  2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
us-gaap:CommonStockValue ▄▄▄▄▄▄▄18.818.818.818.818.818.818.8NA18.818.818.818.818.818.818.718.718.618.418.418.4NA18.018.018.017.817.817.817.717.6NANANA17.2NANANA17.2NANANA17.2NANA
 us-gaap:SharesIssued us-gaap:StatementEquityComponents us-gaap:CommonStock██████████████▇▆▅▂▁▁75.375.375.375.375.375.375.375.375.375.375.375.375.375.275.174.874.473.773.573.4NA72.272.172.071.471.270.970.770.4NANA34.734.434.334.334.334.334.334.3NA34.3NANA
 us-gaap:SharesIssued us-gaap:StatementEquityComponents us-gaap:TreasuryStock▄▂▃▄▇▁▂▆█▁▁█▇▂1.51.31.41.51.71.21.31.61.81.21.21.81.71.3NANANA0.6NANANANANANA0.1NANANA0.2NANA0.10.1-0.2-0.3-0.5-0.6-0.6-0.7NA-1.0NANA
us-gaap:CommonStockSharesIssued ▄▄▄▄▄▄▄75.375.375.375.375.375.375.3NA75.375.375.375.375.375.275.174.874.473.773.573.4NA72.272.172.071.471.270.970.770.4NANANA68.8NANANA68.6NANANA68.6NANA
us-gaap:CommonStockSharesAuthorized NA200.0NA200.0100.0100.0100.0NA100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0NA100.0100.0100.0100.0100.0100.0100.0100.0NANANA50.0NANANA50.0NANANA50.0NANA
us-gaap:CommonStockSharesOutstanding ▄▇▅▄▁█▇73.874.073.973.873.674.174.0NA73.574.174.173.573.673.974.374.073.673.173.273.2NA72.172.071.971.371.170.870.670.2NANANA68.6NANANA67.4NANANA66.6NANA
us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding 75.8NA75.875.575.5NA75.575.175.3NA75.775.075.5NA75.975.874.9NA75.074.874.173.973.773.3NA72.672.472.3NA71.4141.670.2NA69.473.274.2NA74.074.073.6NA73.473.4
us-gaap:WeightedAverageNumberOfSharesOutstandingBasic 73.9NA73.973.873.9NA74.073.774.1NA73.973.673.9NA74.273.973.3NA73.373.372.572.272.071.7NA71.070.870.6NA69.8139.069.0NA68.268.067.8NA67.667.266.8NA66.866.6
us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 0.1NA0.00.20.1NA0.10.40.6NA0.10.90.7NA0.50.50.2NA0.10.10.60.80.80.8NA0.60.60.2NANA0.90.2NANA0.61.9NA1.71.01.4NA1.71.3
us-gaap:EarningsPerShareBasic █▆▅▅▄▄▄▄▄▃▄▄▃▁▃▃▄▃▃▃▂▁▂▃▃▃▃▂▂▂▂▃▂▂▂▂▂▂▂▂▁▂▂2.041.321.111.241.010.860.760.90.750.69999999999999970.750.760.590.00.690.530.830.530.510.610.310.020.390.460.439999999999999950.440.530.380.330000000000000070.380.220.460.310000000000000050.2150.230.430.275000000000000130.250.30.2950.089999999999999970.2650.325
us-gaap:EarningsPerShareDiluted █▆▅▅▄▄▄▄▄▃▄▄▃▁▃▃▄▃▃▃▂▁▂▃▃▃▃▂▂▂▂▃▂▂▂▂▂▂▂▂▁▂▂1.991.291.091.210.990.840.750.880.730.69000000000000040.730.750.580.00.670.510.810.510.50.60.30.020.380.450.429999999999999940.430.520.380.320000000000000060.370.2150.450.299999999999999930.2150.2250.4050.270.2450.2850.280.094999999999999970.2550.31
  2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
 Operating Margin us-gaap:ConsolidationItems,us-gaap:StatementBusinessSegments us-gaap:OperatingSegments,wst:ContractManufacturedProducts127.1NANANA118.1NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 Operating Margin us-gaap:ConsolidationItems,us-gaap:StatementBusinessSegments us-gaap:OperatingSegments,wst:DeliverySystemsNANA126.6127.8NANA111.1109.4NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 Operating Margin us-gaap:ConsolidationItems,us-gaap:StatementBusinessSegments us-gaap:OperatingSegments,wst:PackagingSystemsNANA421.5399.5NANA345.2360.3NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 Operating Margin us-gaap:ConsolidationItems,us-gaap:StatementBusinessSegments us-gaap:OperatingSegments,wst:ProprietaryProducts543.7NANANA373.5NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
 TTM Greenblatt ROC _ _█▆▅▅▅▄▄▄▄▄▄▃▃▃▄▃▄▃▃▄▂▁▃▃▃▃▃▃▃▃▃▃▂▂▃▃▂▂▂▂175.6116.199.2103.688.078.167.380.570.765.860.860.353.457.963.942.761.352.751.361.230.0-3.539.147.844.644.054.139.336.939.742.543.331.526.335.641.727.026.127.828.8NANANA
  2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
us-gaap:AllocatedShareBasedCompensationExpense ▄▄▆▇▄▄▄▅▄▂▄▄▃▃▄▄▃▄▄▄▄▃█▄▄▃▄▃▄▄▄▄▃▃▃▃▃▁▃▃5.96.410.012.25.45.65.47.26.20.45.36.03.42.54.65.53.55.44.64.94.63.615.55.36.13.64.64.35.65.25.05.43.74.44.33.23.6-1.73.23.3NANANA
us-gaap:ComprehensiveIncomeNetOfTax ▆█▆▅▁▄▁▃121.6147.3110.695.731.684.738.167.3NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:CostOfGoodsAndServicesSold █▇▆▆▅▅▅▅▄▄▄▅▄▄▄▄▃▃▃▃▂▂▃▂▃▃▃▃▂▂▂▂▂▂▂▂▁▂▂▁▁▁▁398.8369.1353.4332.1324.5317.4308.3311.8296.7289.3296.1305.3281.3286.8273.2272.6253.6258.6255.6254.7238.8236.2241.5226.2240.1246.0247.1240.4236.1236.3233.6227.7224.0213.4226.1215.2210.1212.2223.3207.4198.8196.7198.6
us-gaap:GrossProfit █▆▅▅▄▄▄▄▄▃▃▃▃▃▃▃▃▃▃▃▃▂▃▂▂▂▃▂▂▂▂▂▂▂▂▂▁▁▁▁▁▁▁271.9211.1194.6195.1167.0153.2147.8157.9146.8133.2135.6142.2134.4128.8125.0125.0134.1123.7121.1133.3123.3108.3118.2109.7109.7109.9121.8106.4106.6105.5110.9111.797.590.498.7101.185.381.484.688.078.074.783.2
us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments █▆▅▅▅▄▄▄▄▄▄▄▃▄▄▃▄▃▃▄▂▁▃▃▃▃▃▃▃▃▃▃▂▂▂▃▂▂▂▂▁▂▂174.9115.197.7102.086.577.464.979.669.965.861.160.153.759.362.940.759.553.249.359.527.8-6.736.144.141.641.350.435.733.535.738.839.128.322.420.037.823.022.023.524.31.521.226.7
us-gaap:IncomeTaxExpenseBenefit ▅▄▄▃▃▃▃▃▃▃▂▂▃█▃▂▂▃▃▃▂▁▃▃▃▃▃▃▃▃▃▃▂▃▂▃▂▂▂▂▁▂▂28.720.421.116.015.016.510.915.516.114.98.06.012.561.814.02.92.216.114.417.06.9-6.69.212.511.711.714.09.810.710.610.38.67.29.06.59.85.66.65.36.1-3.74.56.6
us-gaap:InterestExpense ▂▃▃▂▂▃▃▂▃▃▂▃▂▃▁▃▃▁▃▂▃▆▅▇▆█▇▇▆▇▇█▆▇█▇▇████▇▆1.92.0999999999999992.12.02.02.12.12.02.32.32.02.21.92.11.32.32.11.42.22.02.53.73.44.13.84.54.24.03.94.44.14.63.54.44.64.34.44.54.64.74.74.23.9
us-gaap:NetIncomeLoss █▄▃▄▂▂▁▂▁151.298.482.391.274.363.956.366.155.4NANANANANANANANANANANANANANANANANANANANANANANANANANA29.2NA16.920.119.66.017.821.7
us-gaap:NonoperatingIncomeExpense 0.7NANANA1.5NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:OperatingIncomeLoss █▆▅▅▅▄▄▄▄▄▄▃▃▃▄▃▄▃▃▄▂▁▃▃▃▃▃▃▃▃▃▃▂▂▃▃▂▂▂▂▁▂▂175.6116.199.2103.688.078.167.380.570.765.860.860.353.457.963.942.761.352.751.361.230.0-3.539.147.844.644.054.139.336.939.742.543.331.526.335.641.727.026.127.828.85.925.330.5
us-gaap:OtherNonoperatingIncomeExpense ▆▆▅▄▅▄▁▅▅████▅▆▅▆1.10.90.40.20.30.1-1.30.50.61.61.81.71.60.61.10.60.8NANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:ResearchAndDevelopmentExpense ▇██▆▆▅▄▅▅▅▅▆▅▅▄▅▅▅▄▄▅▄▃▃▃▅▅▅▅▅▅▄▄▃▃▄▂▃▃▂▂▁▁12.212.912.510.810.710.29.39.69.89.810.110.89.69.79.110.010.39.69.08.89.48.58.17.57.89.69.910.09.79.69.59.18.68.28.28.37.27.77.36.96.95.95.7
us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax █▆▆▅▅▄▄▄▄▄▄▄▄▄▃▃▃▃▃▃▃▂▃▂▂▂▃▂▂▂▂▂▂▂▂▂▁▁▂▁▁▁▁670.7580.2548.0527.2491.5470.6456.1469.7443.5422.5431.7447.5415.7415.6398.2397.6387.7382.3376.7388.0362.1344.5359.7335.9349.8355.9368.9346.8342.7341.8344.5339.4321.5303.8324.8316.3295.4293.6307.9295.4276.8271.4281.8
us-gaap:Revenues █▆▆▅▅▄▄▄▄▄▄▄▄▄▃▃▃▃▃▃▃▂▃▂▂▂▃▂▂▂▂▂▂▂▂▂▁▁▂▁▁▁▁670.7580.2548.0527.2491.5470.6456.1469.7443.5422.5431.7447.5415.7415.6398.2397.6387.7382.3376.7388.0362.1344.5359.7335.9349.8355.9368.9346.8342.7341.8344.5339.4321.5303.8324.8316.3295.4293.6307.9295.4276.8271.4281.8
us-gaap:SellingGeneralAndAdministrativeExpense █▇▇█▆▆▅▆▆▄▅▆▆▄▄▄▄▄▄▄▄▃▄▃▄▃▃▃▄▃▄▄▄▃▃▂▁▁▂▂▂▁▁80.276.376.277.771.869.064.870.368.659.764.970.068.362.361.560.661.660.758.362.558.154.660.855.258.856.057.556.460.056.159.759.158.653.754.451.346.345.748.550.650.544.945.8
  2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
  2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
us-gaap:Assets ▇█▆▃▂▃▁2739.72793.82582.82392.32246.52341.42174.0NA2036.21978.91946.11873.71869.61862.81930.41843.01733.51716.71735.31705.1NA1666.51663.71596.01670.91673.31704.71708.21671.6NANA1577.11564.01527.41462.81457.31399.11398.31415.3NA1294.3NANA
us-gaap:Liabilities ▇█▆▄▃▃▁910.7939.3863.9786.0756.3768.2686.4NA666.7582.6594.3591.8564.3582.9613.5600.6564.9599.2593.0595.7NA671.2674.3654.9714.0703.2732.1773.6765.2NANA831.2835.1810.3783.3762.6744.2707.0719.3NA668.6NANA
us-gaap:LiabilitiesAndStockholdersEquity ▇█▆▃▂▃▁2739.72793.82582.82392.32246.52341.42174.0NA2036.21978.91946.11873.71869.61862.81930.41843.01733.51716.71735.31705.1NA1666.51663.71596.01670.91673.31704.71708.21671.6NANA1577.11564.01527.41462.81457.31399.11398.31415.3NA1294.3NANA
us-gaap:StockholdersEquity ██▆▄▃▄▃▂▁▁1829.01854.51718.91606.31490.21573.21487.61445.11369.51396.3NANANA1279.9NANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
us-gaap:AssetsCurrent ▇█▆▃▁▂▁1327.01373.71238.31110.6977.51058.71004.1NA867.6894.4850.1766.9743.5743.5776.9717.8652.6641.9658.1659.2NA680.9679.9625.1659.3679.5685.4686.6650.7NANA589.7557.3557.3517.0502.8472.0503.5510.4NA436.6NANA
us-gaap:CashAndCashEquivalentsAtCarryingValue ▆█▇▆▄▆▅▄▄▄▄▃▃▃▄▃▂▃▃▃▂▃▃▃▃▃▃▃▃▃▃▂▂▂▂▁▁▂▂▁▂▁▁483.7615.5519.4445.9335.3439.1396.0326.7265.5337.4297.3225.5199.8235.9269.3226.6169.4203.0205.9202.7178.1256.8252.0207.1255.3246.8226.7230.0230.0221.7190.6175.0161.9143.2107.0100.291.8119.2110.494.6110.297.167.5
us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents ▁█▃483.7615.5519.4NA335.3439.1396.0NANA337.4NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:AccountsReceivableNetCurrent █▄▄▂▂▁▁465.7385.3373.0340.6333.0319.3316.1NA318.2288.2302.9296.7290.4253.2251.8242.4224.8200.5209.5219.0NA194.6198.8189.5179.0195.9209.6208.7185.7NANA189.0175.0182.9185.0176.0147.2153.1165.7NA126.4NANA
us-gaap:InventoryNet ▇█▆▄▃▁▁310.2321.3294.9274.8251.0235.7230.4NA226.1214.5206.8208.2215.7215.2215.8211.3212.3199.3201.1197.7NA187.7187.2183.4181.5185.7187.9187.5176.9NANA173.5162.2165.9159.2158.2151.8155.5161.2NA147.0NANA
us-gaap:OtherAssetsCurrent █▂▂▁▄▇▆67.451.651.049.358.264.661.6NA57.854.343.136.537.639.240.037.546.139.141.639.8NA33.533.736.435.732.744.444.134.7NANA35.138.136.032.934.546.865.061.6NA42.5NANA
  2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
us-gaap:NoncurrentAssets NA1011.5NANANA909.4NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:NoncurrentAssets us-gaap:StatementGeographical country:DENA112.0NANANA105.5NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:NoncurrentAssets us-gaap:StatementGeographical country:FRNA76.0NANANA53.8NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:NoncurrentAssets us-gaap:StatementGeographical country:IENA197.6NANANA176.6NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:NoncurrentAssets us-gaap:StatementGeographical country:USNA407.8NANANA364.7NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:NoncurrentAssets us-gaap:StatementGeographical wst:OtherCountriesNA151.3NANANA149.1NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:NoncurrentAssets us-gaap:StatementGeographical wst:OtherEuropeCountriesNA66.8NANANA59.7NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:PropertyPlantAndEquipmentGross ██▅▃▂▂▁2028.62035.51939.11858.11816.91820.11779.8NA1759.91752.71745.81737.01775.31745.81701.21646.71583.61554.71551.11498.8NA1398.31380.31349.11390.81381.71402.31385.01369.0NANA1271.41274.81226.81185.41184.91136.81135.11143.9NA1077.2NANA
us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment ██▆▄▂▂▁1097.81092.31055.71018.3988.6980.8967.7NA945.2930.7923.8910.3917.5890.8865.8834.9800.8776.4778.4757.6NA708.8694.9673.3685.0686.9693.1673.0657.3NANA612.9605.8589.8565.1565.7543.2559.0562.4NA522.4NANA
 us-gaap:AmortizationOfIntangibleAssets us-gaap:BusinessAcquisition us-gaap:SeriesOfIndividuallyImmaterialBusinessAcquisitionsNA0.70.71.1NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:AmortizationOfIntangibleAssets us-gaap:ConsolidationItems us-gaap:MaterialReconcilingItemsNANA0.2NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:PropertyPlantAndEquipmentNet ▇█▅▂▂▂▁930.8943.2883.4839.8828.3839.3812.1NA814.7822.0822.0826.7857.8855.0835.4811.8782.8778.3772.7741.2NA689.5685.4675.8705.8694.8709.2712.0711.7NANA658.5669.0637.0620.3619.2593.6576.1581.5NA554.8NANA
us-gaap:InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures ███▇▇▇▁211.9214.7209.6199.6197.7192.797.4NA94.991.290.591.889.985.884.683.681.382.781.477.7NA59.259.859.360.661.860.459.460.9NANA55.659.860.757.558.356.255.051.2NA48.2NANA
us-gaap:Goodwill ▆█▅▃▁▃▁109.5111.1109.3107.6106.9107.8106.6NA105.2105.8106.3106.6108.8107.7107.1105.8103.5103.0105.2104.9NA105.7105.3104.4108.6110.4114.0114.2114.2NANA111.0112.5111.5110.0112.7111.5113.6116.1NA112.5NANA
us-gaap:IntangibleAssetsNetExcludingGoodwill ▂▆▇█▁▅▂28.730.530.631.228.129.828.7NA19.520.321.021.722.821.722.522.923.123.324.424.9NA38.639.440.242.043.446.147.148.3NANA49.950.650.949.551.252.052.654.2NA55.1NANA
us-gaap:FiniteLivedIntangibleAssetsNet NA30.5NANANA29.8NANANA20.3NANANA21.7NANANANANANANANANANA42.0NANANA48.3NANANA50.6NANANA52.0NANANANANANA
 us-gaap:FiniteLivedIntangibleAssetsNet us-gaap:FiniteLivedIntangibleAssetsByMajorClass us-gaap:CustomerContractsNA3.2NANANA3.6NANANA4.2NANANA4.8NANANANANANANANANANA6.4NANANA7.5NANANA7.9NANANA8.3NANANANANANA
 us-gaap:FiniteLivedIntangibleAssetsNet us-gaap:FiniteLivedIntangibleAssetsByMajorClass us-gaap:CustomerRelationshipsNA17.5NANANA18.7NANANA9.3NANANA10.2NANANANANANANANANANA13.2NANANA15.1NANANA16.8NANANA18.5NANANANANANA
 us-gaap:FiniteLivedIntangibleAssetsNet us-gaap:FiniteLivedIntangibleAssetsByMajorClass us-gaap:InProcessResearchAndDevelopmentNA1.6NANANA1.8NANANA2.1NANANA2.3NANANANANANANANANANA3.0NANANA3.4NANANA3.4NANANANANANANANANANA
 us-gaap:FiniteLivedIntangibleAssetsNet us-gaap:FiniteLivedIntangibleAssetsByMajorClass us-gaap:TrademarksNA0.2NANANA0.2NANANA0.2NANANA0.3NANANANANANANANANANA10.8NANANA11.0NANANA11.1NANANA11.2NANANANANANA
 us-gaap:FiniteLivedIntangibleAssetsNet us-gaap:FiniteLivedIntangibleAssetsByMajorClass wst:PatentsAndLicensingNA8.0NANANA5.5NANANA4.5NANANA4.1NANANANANANANANANANA8.6NANANA11.3NANANA11.4NANANA10.3NANANANANANA
us-gaap:DeferredTaxAssetsLiabilitiesNet NA5.6NANANA-1.5NANANA11.6NANANA15.3NANANANANANANANANANA57.9NANANA58.5NANANA76.2NANANA70.5NANANANANANA
us-gaap:OperatingLeaseRightOfUseAsset ▁▅▄▅▅▇█64.568.367.568.568.570.171.3NA75.20.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:OtherAssetsNoncurrent █▆▄▃▄█▁24.823.421.821.322.024.720.0NA26.420.521.721.521.923.416.716.021.521.322.822.5NA25.727.427.128.522.924.123.724.0NANA24.124.524.524.528.728.729.130.0NA22.6NANA
  2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
us-gaap:AccountsPayableCurrent ▇█▅▃▂▂▁204.3213.1180.3162.3157.9156.8145.3NA137.7130.4125.2126.2127.6138.1121.9130.9106.1122.099.0107.3NA93.691.488.5103.191.494.598.4108.0NANA91.6102.981.385.682.789.871.773.4NA63.2NANA
us-gaap:AccruedIncomeTaxesCurrent █▄▅▅▂▁▃49.726.030.229.213.96.419.1NA17.39.817.717.913.36.07.42.46.24.53.29.3NA19.018.515.014.918.115.012.414.3NANA16.515.619.814.813.37.87.96.1NA5.0NANA
us-gaap:DebtCurrent ██████▁2.32.32.32.32.32.30.0NA0.00.10.00.00.00.033.233.834.42.42.62.5NA71.095.098.827.227.22.214.22.2NANA1.732.739.389.186.550.154.76.3NA0.3NANA
us-gaap:DividendsPayableCurrent NA12.6NANANA11.8NANANA11.3NANANA10.4NANANA9.5NANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LiabilitiesCurrent ▇█▆▃▁▁▁482.8503.4447.7375.2344.4341.6335.0NA301.1283.7288.8287.6263.4279.5300.0289.0256.5241.0236.8239.4NA299.9313.7296.6252.5242.5221.2227.6236.9NANA208.1261.8275.6320.2302.4243.2229.3192.7NA169.7NANA
 us-gaap:LongTermDebtCurrent us-gaap:LongtermDebtType wst:TermLoanDue2024NA2.3NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:OperatingLeaseLiabilityCurrent ▁█▆▅▁▃▅9.410.19.99.89.49.69.8NA10.20.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:OtherLiabilitiesCurrent ██▆▃▂▂▁144.8143.6126.799.797.591.386.0NA80.276.676.486.269.677.072.371.563.658.367.459.6NA57.653.953.051.852.155.658.643.3NANA45.743.570.771.669.238.732.543.2NA40.8NANA
  2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
us-gaap:LongTermDebt ██████▁254.6255.2255.7256.2256.7257.3195.1NA195.5196.1196.2196.4NA197.0NANANANANANANA302.5326.7330.7336.7342.7361.5404.9373.5NANA430.1411.5401.4385.5289.5349.4NANANANANANA
us-gaap:LongTermDebtNoncurrent ██████▁252.3252.9253.4253.9254.4255.0195.1NA195.5196.0196.2196.4198.0197.0196.6195.7194.2226.2228.6228.9NA231.5231.7231.9309.5315.5359.3390.7371.3NANA428.4378.8362.1296.4294.9299.3323.3367.2NA358.1NANA
us-gaap:DeferredIncomeTaxLiabilitiesNet ▇▆▃▁▄█12.210.44.50.05.615.5NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent ▆█▄▅▄▅▁55.257.551.652.650.752.546.8NA54.356.253.853.655.053.462.060.157.175.662.561.2NA81.563.061.483.775.079.182.883.1NANA135.8135.4114.8112.3111.3126.084.192.0NA87.2NANA
us-gaap:OtherLiabilitiesNoncurrent ▁▂█▇▅▆▄28.331.846.843.440.041.235.7NA34.133.643.842.435.642.646.046.647.347.249.951.7NA48.949.849.652.651.952.952.855.0NANA39.738.337.635.133.454.150.546.3NA33.6NANA
us-gaap:OperatingLeaseLiabilityNoncurrent ▁▄▄▅▅▇█57.460.459.960.961.262.463.5NA67.40.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo ▁▆▃▃█▆9.210.49.79.610.910.4NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree ▁█▃▂▇▂8.59.38.78.69.28.6NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour ▁█▆▆▆▅6.68.78.28.18.27.8NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive NA6.9NANA7.77.3NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive NA37.5NANA41.041.8NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
us-gaap:StockholdersEquity ██▆▄▃▄▃▂▁▁1829.01854.51718.91606.31490.21573.21487.61445.11369.51396.3NANANA1279.9NANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:CommonStockValue ▄▄▄▄▄▄▄18.818.818.818.818.818.818.8NA18.818.818.818.818.818.818.718.718.618.418.418.4NA18.018.018.017.817.817.817.717.6NANANA17.2NANANA17.2NANANA17.2NANA
us-gaap:AdditionalPaidInCapital ▁▇▇▅▇█▇246.7267.3268.2263.1267.6272.7268.5NA278.5282.0282.8304.7308.5309.3302.9292.3276.0260.4247.6240.6NA195.8188.6170.4160.2149.1138.2129.9120.0NANANA79.3NANANA76.3NANANA77.3NANA
us-gaap:RetainedEarningsAccumulatedDeficit █▆▅▄▃▂▁1985.41846.71773.41703.01611.81549.41497.3NA1398.21353.41312.71258.01222.81178.21188.61148.01118.81071.61041.91013.8NA939.9947.0927.2902.2878.7855.5825.0805.0NANANA719.9NANANA664.5NANANA612.6NANA
us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax ▅█▄▁▁▅▃-140.2-110.6-159.5-187.8-192.3-149.6-170.4NA-153.4-154.2-153.8-143.7-95.8-117.3-130.6-151.8-179.0-186.8-143.8-150.3NA-154.4-160.2-170.3-119.2-71.3-34.7-33.8-32.4NANA-92.5-75.9NANANA-71.5NANANA-31.3NANA
us-gaap:TreasuryStockValue █▃▄▄▅▁▁281.7167.7182.0190.8215.7118.1126.6NA172.6103.7108.7155.9149.0109.162.764.865.846.121.813.1NA4.04.04.24.14.24.24.23.8NANANA3.0NANANA23.0NANANA41.5NANA
  2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
us-gaap:NetCashProvidedByUsedInOperatingActivities ▅█▇█▄▆▆▆▃▄▅▅▃▅▅▅▂▄▄▅▁▄▅▁▃▄▄▁▄▄▅▂▄▃▄▂▃▃▃▂▃▃88.7148.7118.6148.157.1106.4108.1105.147.673.288.482.045.081.575.885.320.771.868.476.23.068.877.5-1.946.063.964.28.868.853.379.518.969.851.652.213.841.839.739.79.547.248.0NA
us-gaap:NetCashProvidedByUsedInInvestingActivities ▅▅▆▆▇▁▇▆▇▇▇█▇▇▇▇▇▆▆▆▇▇▇▇▇██▇▇▇█▅█▇▇▇▇▇█▇██-54.5-57.6-49.1-40.9-31.9-120.6-31.6-47.1-28.7-28.6-26.5-17.0-28.7-29.4-34.0-35.5-34.7-46.7-47.9-42.6-38.6-29.5-25.5-30.6-26.3-20.7-21.4-35.6-38.9-29.1-24.2-57.7-22.7-25.5-35.9-31.9-36.3-32.0-23.1-29.1-18.6-18.8NA
us-gaap:NetCashProvidedByUsedInFinancingActivities ▁▆▆▆▂█▆▆▃▆▇▅▄▃▆▆▅▅▆▆▄▅▆▆▆▆▅▇▅▆▅█▅▆▆▇▅▆▆▆▆▆-156.4-8.7-7.2-0.9-120.351.0-0.43.1-90.5-8.210.1-25.7-56.9-86.5-3.02.3-21.8-26.4-15.0-7.4-65.1-30.4-10.71.2-1.8-10.0-45.226.2-23.53.1-40.255.5-29.57.7-5.824.2-28.16.1-2.80.1-14.6-4.2NA
us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect ▁█▇█▂▆▇▇▃-131.896.173.5110.6-103.843.169.361.2-71.9NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
us-gaap:IncreaseDecreaseInOtherOperatingCapitalNet █▁▅▄▅▄▄▄▄▃▄▄▅▅▄▄▅▃▄▇▅▅▄▇▃▄▄▆▃▄▄▆▃▄▄▆▄▄▅▆94.9-93.320.50.64.3-10.2-0.70.50.8-32.30.60.72.77.8-0.40.43.2-33.2-9.459.51.06.6-12.661.1-43.3-7.40.443.2-27.2-0.7-25.237.8-43.8-12.20.236.1-19.5-5.41.031.7NANANA
us-gaap:NetCashProvidedByUsedInOperatingActivities ▅█▇█▄▆▆▆▃▄▅▅▃▅▅▅▂▄▄▅▁▄▅▁▃▄▄▁▄▄▅▂▄▃▄▂▃▃▃▂▃▃88.7148.7118.6148.157.1106.4108.1105.147.673.288.482.045.081.575.885.320.771.868.476.23.068.877.5-1.946.063.964.28.868.853.379.518.969.851.652.213.841.839.739.79.547.248.0NA
us-gaap:NetIncomeLoss █▄▃▄▂▂▁▂▁151.298.482.391.274.363.956.366.155.4NANANANANANANANANANANANANANANANANANANANANANANANANANA29.2NA16.920.119.66.017.821.7
us-gaap:ShareBasedCompensation ▄▄▅▇▃▃▃▄▄▁▃▄▂▂▃▃▂▃▃▃▃▂█▃▄▂▃▃▃▃▃▃5.96.49.912.35.45.65.47.26.20.45.36.03.42.54.65.53.55.44.64.94.63.615.55.36.13.64.64.35.65.25.05.4NANANANANANANANANANANA
  2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
us-gaap:NetCashProvidedByUsedInInvestingActivities ▅▅▆▆▇▁▇▆▇▇▇█▇▇▇▇▇▆▆▆▇▇▇▇▇██▇▇▇█▅█▇▇▇▇▇█▇██-54.5-57.6-49.1-40.9-31.9-120.6-31.6-47.1-28.7-28.6-26.5-17.0-28.7-29.4-34.0-35.5-34.7-46.7-47.9-42.6-38.6-29.5-25.5-30.6-26.3-20.7-21.4-35.6-38.9-29.1-24.2-57.7-22.7-25.5-35.9-31.9-36.3-32.0-23.1-29.1-18.6-18.8NA
us-gaap:PaymentsToAcquirePropertyPlantAndEquipment ▇▇▆▄▃▄▃▃▃▃▂▁▃▃▄▃▄▆▆▄▄▃▂▃▃▃▂▃▄▃▂█▃▃▄▃▄▂▁▁▂▁54.757.747.537.132.137.631.728.328.830.026.520.228.029.534.329.537.547.548.735.039.029.726.730.427.128.624.531.738.829.322.161.732.929.037.032.433.424.218.419.421.317.2NA
  2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
us-gaap:NetCashProvidedByUsedInFinancingActivities ▁▆▆▆▂█▆▆▃▆▇▅▄▃▆▆▅▅▆▆▄▅▆▆▆▆▅▇▅▆▅█▅▆▆▇▅▆▆▆▆▆-156.4-8.7-7.2-0.9-120.351.0-0.43.1-90.5-8.210.1-25.7-56.9-86.5-3.02.3-21.8-26.4-15.0-7.4-65.1-30.4-10.71.2-1.8-10.0-45.226.2-23.53.1-40.255.5-29.57.7-5.824.2-28.16.1-2.80.1-14.6-4.2NA
us-gaap:PaymentsOfDividendsCommonStock ██▇▇▇▇▇▇▇▇▆▆▆▆▅▅▅▅▄▄▄▃▃▃▃▃▃▃▃▂▂▂▂▂▂▂▂▁▂▁▁▁12.612.611.911.811.811.811.111.111.111.110.310.310.410.49.69.69.59.68.78.88.77.97.97.97.97.17.07.17.16.66.66.56.66.16.16.16.15.76.05.45.75.3NA
us-gaap:PaymentsForRepurchaseOfCommonStock █▁▁▁▇▁▁▁▅▁▁▂▃▃▁▁▂▂▁▁▁▁137.10.00.00.0115.50.00.00.083.10.00.022.947.947.50.00.026.925.49.68.19.10.0NANANANANANANANANANA2.50.01.60.60.00.01.42.10.1-0.1NA
  2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30

Common Stock Value

us-gaap:CommonStockValue

us-gaap:CommonStockValue


Common
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value1818181818181818181818181818181818181818181818171717171717171717
Percentage of CommonStockValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.70.70.70.80.80.80.90.91.01.01.01.01.01.01.01.11.11.11.11.11.11.11.11.11.11.01.01.11.11.21.31.4

Shares Issued

us-gaap:SharesIssued us-gaap:StatementEquityComponents

us-gaap:SharesIssued

us-gaap:CommonStock


Shares
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-312009-12-312008-12-312007-12-31
Value7575757575757575757575757575757474737373727272727171707070343434343434343434343434
Percentage of SharesIssued100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:TreasuryStock


Shares
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-312014-12-312013-12-312013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-312009-12-312008-12-312007-12-31
Value1.51.31.41.51.71.21.31.61.81.21.21.81.71.30.60.10.10.20.10.1-0.2-0.3-0.5-0.6-0.6-0.7-1.0-1.3-1.6-2.1
Percentage of SharesIssued2.01.71.92.02.31.61.72.12.41.61.62.42.31.70.80.10.10.30.30.3-0.6-0.9-1.5-1.7-1.7-2.0-2.9-3.8-4.7-6.1

Common Stock Shares Issued

us-gaap:CommonStockSharesIssued

us-gaap:CommonStockSharesIssued


Common
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value7575757575757575757575757575747473737372727272717170707068686868
Percentage of CommonStockSharesIssued100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Common Stock Shares Authorized

us-gaap:CommonStockSharesAuthorized

us-gaap:CommonStockSharesAuthorized


Common
Period End2020-12-312020-06-302020-03-312019-12-312019-09-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value20020010010010010010010010010010010010010010010010010010010010010010010010010050505050
Percentage of CommonStockSharesAuthorized100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Common Stock Shares Outstanding

us-gaap:CommonStockSharesOutstanding

us-gaap:CommonStockSharesOutstanding


Common
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value7374737373747473747473737374747373737372727271717170707068676666
Percentage of CommonStockSharesOutstanding100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Weighted Average Number Of Diluted Shares Outstanding

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding


Weighted
Period End2021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-30
Value7575757575757575757575757475747473737372727271141706973747474737373
Percentage of WeightedAverageNumberOfDilutedSharesOutstanding100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Weighted Average Number Of Shares Outstanding Basic

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic


Weighted
Period End2021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-30
Value7373737374737473737374737373737272727171707069139696868676767666666
Percentage of WeightedAverageNumberOfSharesOutstandingBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount

us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount

us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount


Antidilutive
Period End2021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-06-302013-03-312012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-30
Value100000.00200000.0100000.0100000.0400000.0600000.0100000.0900000.0700000.0500000.0500000.0200000.0100000.0100000.0600000.0800000.0800000.0800000.0600000.0600000.0200000.0900000.0200000.0600000.01900000.01700000.01000000.01400000.01700000.01300000.0
Percentage of AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Earnings Per Share Basic

us-gaap:EarningsPerShareBasic

us-gaap:EarningsPerShareBasic


Earnings
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value2.041.321.111.241.010.860.760.90.750.70.750.760.5900.690.530.830.530.510.610.310.020.390.460.440.440.530.380.330.380.220.460.310.2150.230.430.2750.250.30.2950.090.2650.325
Percentage of EarningsPerShareBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Earnings Per Share Diluted

us-gaap:EarningsPerShareDiluted

us-gaap:EarningsPerShareDiluted


Earnings
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value1.991.291.091.210.990.840.750.880.730.690.730.750.5800.670.510.810.510.50.60.30.020.380.450.430.430.520.380.320.370.2150.450.30.2150.2250.4050.270.2450.2850.280.0950.2550.31
Percentage of EarningsPerShareDiluted100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Allocated Share Based Compensation Expense

us-gaap:AllocatedShareBasedCompensationExpense

us-gaap:AllocatedShareBasedCompensationExpense


Allocated
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value5.96.410.0125.45.65.47.26.20.45.36.03.42.54.65.53.55.44.64.94.63.6155.36.13.64.64.35.65.25.05.43.74.44.33.23.6-1.73.23.3
Percentage of AllocatedShareBasedCompensationExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.91.11.82.31.11.21.21.51.40.01.21.30.80.01.21.40.90.01.21.31.31.04.31.60.01.01.21.20.01.51.51.60.01.41.31.00.0-0.61.01.1

Comprehensive Income Net Of Tax

us-gaap:ComprehensiveIncomeNetOfTax

us-gaap:ComprehensiveIncomeNetOfTax


Comprehensive
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value1211471109531843867
Percentage of ComprehensiveIncomeNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax18.125.420.218.26.418.08.414.3

Cost Of Goods And Services Sold

us-gaap:CostOfGoodsAndServicesSold

us-gaap:CostOfGoodsAndServicesSold


Cost
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value398369353332324317308311296289296305281286273272253258255254238236241226240246247240236236233227224213226215210212223207198196198
Percentage of CostOfGoodsAndServicesSold100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax59.563.664.563.066.067.467.666.466.90.068.668.267.70.068.668.665.40.067.965.665.968.667.167.30.069.167.069.30.069.167.867.10.070.269.668.00.072.372.570.20.072.570.5

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

us-gaap:ForeignExchangeContract, us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:AccumulatedGainLossNetCashFlowHedgeParent


Cost
Period End2020-09-302020-06-302020-03-312019-09-302019-06-30
Value0.1-0.3-0.1-0.3-0.3
Percentage of CostOfGoodsAndServicesSold0.0-0.1-0.0-0.1-0.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.0-0.1-0.0-0.1-0.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ForeignExchangeContract us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome us-gaap:AccumulatedGainLossNetCashFlowHedgeParent-33.30.0-33.3-100.00.0

General And Administrative Expense

us-gaap:GeneralAndAdministrativeExpense us-gaap:ConsolidationItems

us-gaap:GeneralAndAdministrativeExpense

us-gaap:CorporateNonSegment


General
Period End2021-03-312020-03-31
Value-13.9-12.6
Percentage of GeneralAndAdministrativeExpense100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-2.1-2.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:CorporateNonSegment0.00.0

Gross Profit

us-gaap:GrossProfit

us-gaap:GrossProfit


Gross
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value27121119419516715314715714613313514213412812512513412312113312310811810910910912110610610511011197909810185818488787483
Percentage of GrossProfit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax40.536.435.537.034.032.632.433.633.10.031.431.832.30.031.431.434.60.032.134.434.131.432.932.70.030.933.030.70.030.932.232.90.029.830.432.00.027.727.529.80.027.529.5

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 End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value174115971028677647969656160535962405953495927-6.73644414150353335383928222037232223241.52126
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax26.119.817.819.317.616.414.216.915.80.014.213.412.90.015.810.215.30.013.115.37.7-1.910.013.10.011.613.710.30.010.411.311.50.07.46.212.00.07.57.68.20.07.89.5

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents

us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:AccumulatedDefinedBenefitPlansAdjustment


Income
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value-0.6-0.2-0.8-0.9-1.3-0.6-2.40.10.20.00.30.20.1-0.10.1-0.20.0-0.7-0.5-0.5-49.9-0.9-1.0-0.4-0.5-0.5-0.5-1.8-1.4-2.0-2.0
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments-0.3-0.2-0.8-0.9-1.5-0.8-3.70.10.30.00.50.30.2-0.20.2-0.50.0-1.4-0.8-1.8744.8-2.5-2.3-1.0-1.2-1.0-1.4-5.4-3.9-5.2-5.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-0.1-0.0-0.1-0.2-0.3-0.1-0.50.00.00.00.10.00.00.00.0-0.10.0-0.2-0.1-0.1-14.5-0.3-0.30.0-0.1-0.1-0.10.0-0.4-0.6-0.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome us-gaap:AccumulatedDefinedBenefitPlansAdjustment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:AccumulatedGainLossNetCashFlowHedgeParent


Income
Period End2021-03-312020-09-302020-06-302020-03-312019-09-302019-06-30
Value-1.00.62.52.3-3.85.1
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments-0.60.62.52.7-5.96.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-0.10.10.50.5-0.81.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome us-gaap:AccumulatedGainLossNetCashFlowHedgeParent0.00.00.00.00.00.0

Income Tax Expense Benefit

us-gaap:IncomeTaxExpenseBenefit

us-gaap:IncomeTaxExpenseBenefit


Income
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value282021161516101516148.06.01261142.92.21614176.9-6.69.2121111149.81010108.67.29.06.59.85.66.65.36.1-3.74.56.6
Percentage of IncomeTaxExpenseBenefit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax4.33.53.93.03.13.52.43.33.60.01.91.33.00.03.50.70.60.03.84.41.9-1.92.63.70.03.33.82.80.03.13.02.50.03.02.03.10.02.21.72.10.01.72.3

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

us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:AccumulatedDefinedBenefitPlansAdjustment


Income
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value-0.1-0.1-0.3-0.3-0.3-0.2-0.60.00.10.10.00.10.0-0.20.10.00.0-0.2-0.2-0.2-18.5-0.3-0.4-0.1-0.2-0.2-0.2-1.1-0.5-0.7-0.7
Percentage of IncomeTaxExpenseBenefit-0.3-0.5-1.4-1.9-2.0-1.2-5.50.00.60.70.01.70.0-0.30.70.00.0-1.4-1.2-2.9280.3-3.3-3.2-0.9-1.7-1.4-2.0-10.3-4.7-6.8-8.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-0.0-0.0-0.1-0.1-0.1-0.0-0.10.00.00.00.00.00.00.00.00.00.0-0.1-0.1-0.1-5.4-0.1-0.10.0-0.1-0.1-0.10.0-0.1-0.2-0.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome us-gaap:AccumulatedDefinedBenefitPlansAdjustment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:AccumulatedGainLossNetCashFlowHedgeParent


Income
Period End2021-03-312020-09-302020-06-302020-03-312019-09-302019-06-30
Value-0.20.30.80.8-1.31.8
Percentage of IncomeTaxExpenseBenefit-0.71.45.05.3-11.911.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-0.00.10.20.2-0.30.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome us-gaap:AccumulatedGainLossNetCashFlowHedgeParent0.00.00.00.00.00.0

Interest Expense

us-gaap:InterestExpense

us-gaap:InterestExpense


Interest
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value1.92.0999999999999992.12.02.02.12.12.02.32.32.02.21.92.11.32.32.11.42.22.02.53.73.44.13.84.54.24.03.94.44.14.63.54.44.64.34.44.54.64.74.74.23.9
Percentage of InterestExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.30.40.40.40.40.40.50.40.50.00.50.50.50.00.30.60.50.00.60.50.71.10.91.20.01.31.11.20.01.31.21.40.01.41.41.40.01.51.51.60.01.51.4

Net Income Loss

us-gaap:NetIncomeLoss

us-gaap:NetIncomeLoss


Net
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312012-03-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value1519882917463566655291620196.01721
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax22.517.015.017.315.113.612.314.112.59.25.86.56.60.06.67.7

us-gaap:NetIncomeLoss us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome

us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome


Net
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value-1.30.3-0.21.10.51.1-4.33.4
Percentage of NetIncomeLoss-0.90.3-0.21.20.71.7-7.65.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-0.20.1-0.00.20.10.2-0.90.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.0

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

us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:AccumulatedDefinedBenefitPlansAdjustment


Net
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value-0.5-0.1-0.5-0.6-1.0-0.4-1.80.1
Percentage of NetIncomeLoss-0.3-0.1-0.6-0.7-1.3-0.6-3.20.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-0.1-0.0-0.1-0.1-0.2-0.1-0.40.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome us-gaap:AccumulatedDefinedBenefitPlansAdjustment0.00.00.00.00.00.00.00.0

us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:AccumulatedGainLossNetCashFlowHedgeParent


Net
Period End2021-03-312020-09-302020-06-302020-03-312019-09-302019-06-30
Value-0.80.31.71.5-2.53.3
Percentage of NetIncomeLoss-0.50.41.92.0-4.45.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-0.10.10.30.3-0.50.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome us-gaap:AccumulatedGainLossNetCashFlowHedgeParent0.00.00.00.00.00.0

us-gaap:NetIncomeLoss us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings


Net
Period End2021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-31
Value151829174566655
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax22.515.017.315.112.314.112.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:RetainedEarnings0.00.00.00.00.00.00.0

Nonoperating Income Expense

us-gaap:NonoperatingIncomeExpense

us-gaap:NonoperatingIncomeExpense


Nonoperating
Period End2021-03-312020-03-31
Value700000.01500000.0
Percentage of NonoperatingIncomeExpense100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.10.3

Operating Income Loss

us-gaap:OperatingIncomeLoss

us-gaap:OperatingIncomeLoss


Operating
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value175116991038878678070656060535763426152516130-3.53947444454393639424331263541272627285.92530
Percentage of OperatingIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax26.220.018.119.717.916.614.817.115.90.014.113.512.80.016.010.715.80.013.615.88.3-1.010.914.20.012.414.711.30.011.612.312.80.08.711.013.20.08.99.09.70.09.310.8

us-gaap:OperatingIncomeLoss us-gaap:ConsolidationItems

us-gaap:CorporateNonSegment


Operating
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value-23.4-29.10000000000001-22.4-26.7-18.0-17.199999999999992-14.4-18.3
Percentage of OperatingIncomeLoss-13.3-25.1-22.6-25.8-20.5-22.0-21.4-22.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-3.5-5.0-4.1-5.1-3.7-3.7-3.2-3.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:CorporateNonSegment0.00.00.00.00.00.00.00.0

us-gaap:MaterialReconcilingItems


Operating
Period End2020-09-302020-06-302019-09-302019-06-30
Value-4.7-2.4-2.8-1.4
Percentage of OperatingIncomeLoss-4.7-2.3-4.2-1.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-0.9-0.5-0.6-0.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:MaterialReconcilingItems0.00.00.00.0

us-gaap:OperatingSegments


Operating
Period End2021-03-312020-03-31
Value199106
Percentage of OperatingIncomeLoss113.3120.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax29.721.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments0.00.0

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

us-gaap:OperatingSegments, wst:ContractManufacturedProducts


Operating
Period End2021-03-312020-03-31
Value1612
Percentage of OperatingIncomeLoss9.314.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax2.42.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments wst:ContractManufacturedProducts0.00.0

us-gaap:OperatingSegments, wst:DeliverySystems


Operating
Period End2020-09-302020-06-302019-09-302019-06-30
Value18201111
Percentage of OperatingIncomeLoss19.019.817.214.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax3.43.92.52.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments wst:DeliverySystems14.816.010.410.4

us-gaap:OperatingSegments, wst:PackagingSystems


Operating
Period End2020-09-302020-06-302019-09-302019-06-30
Value1071127288
Percentage of OperatingIncomeLoss108.4108.3108.3110.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax19.621.316.018.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments wst:PackagingSystems25.528.121.124.6

us-gaap:OperatingSegments, wst:ProprietaryProducts


Operating
Period End2021-03-312020-03-31
Value18293
Percentage of OperatingIncomeLoss104.0105.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax27.219.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments wst:ProprietaryProducts0.00.0

Other Income

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

us-gaap:OtherIncome

us-gaap:ForeignExchangeContract, us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:AccumulatedGainLossNetCashFlowHedgeParent


Other
Period End2021-03-312020-09-302020-06-302020-03-312019-09-302019-06-30
Value-600000.01100000.02000000.02000000.0-4300000.04600000.0
Percentage of OtherIncome100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-0.10.20.40.4-0.91.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ForeignExchangeContract us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome us-gaap:AccumulatedGainLossNetCashFlowHedgeParent200.0-366.70.0666.7-1433.30.0

Other Nonoperating Income Expense

us-gaap:OtherNonoperatingIncomeExpense

us-gaap:OtherNonoperatingIncomeExpense


Other
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value1100000.0900000.0400000.0200000.0300000.0100000.0-1300000.0500000.0600000.01600000.01800000.01700000.01600000.0600000.01100000.0600000.0800000.0
Percentage of OtherNonoperatingIncomeExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.20.20.10.00.10.0-0.30.10.10.00.40.40.40.00.30.20.2

Research And Development Expense

us-gaap:ResearchAndDevelopmentExpense

us-gaap:ResearchAndDevelopmentExpense


Research
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value1212121010109.39.69.89.810109.69.79.110.0109.69.08.89.48.58.17.57.89.69.910.09.79.69.59.18.68.28.28.37.27.77.36.96.95.95.7
Percentage of ResearchAndDevelopmentExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.82.22.32.02.22.22.02.02.20.02.32.42.30.02.32.52.70.02.42.32.62.52.32.20.02.72.72.90.02.82.82.70.02.72.52.60.02.62.42.30.02.22.0

Revenue From Contract With Customer Excluding Assessed Tax

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax


Revenue
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value670580548527491470456469443422431447415415398397387382376388362344359335349355368346342341344339321303324316295293307295276271281
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ConsolidationItems

us-gaap:IntersegmentElimination


Revenue
Period End2020-09-302020-06-302019-09-302019-06-30
Value-0.1-0.1-0.20.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-0.0-0.0-0.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-0.0-0.0-0.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:IntersegmentElimination100.0100.0100.00.0

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, wst:DeliverySystems


Revenue
Period End2020-09-302020-06-302019-09-302019-06-30
Value126127111109
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax23.124.224.423.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax23.124.224.423.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments wst:DeliverySystems100.0100.0100.0100.0

us-gaap:OperatingSegments, wst:PackagingSystems


Revenue
Period End2020-09-302020-06-302019-09-302019-06-30
Value421399345360
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax76.975.875.776.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax76.975.875.776.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments wst:PackagingSystems100.0100.0100.0100.0

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

us-gaap:ForeignExchangeContract, us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:AccumulatedGainLossNetCashFlowHedgeParent


Revenue
Period End2021-03-312020-09-302020-03-312019-09-30
Value-0.3-0.30.30.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-0.0-0.10.10.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-0.0-0.10.10.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ForeignExchangeContract us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome us-gaap:AccumulatedGainLossNetCashFlowHedgeParent100.0100.0100.0100.0

Revenues

us-gaap:Revenues

us-gaap:Revenues


Revenues
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value670580548527491470456469443422431447415415398397387382376388362344359335349355368346342341344339321303324316295293307295276271281
Percentage of Revenues100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:Revenues us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, wst:ContractManufacturedProducts


Revenuesus-gaap:
Period End2021-03-312020-03-31
Value127118
Percentage of Revenues19.024.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax19.024.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments wst:ContractManufacturedProducts0.00.0

us-gaap:OperatingSegments, wst:ProprietaryProducts


Revenuesus-gaap:
Period End2021-03-312020-03-31
Value543373
Percentage of Revenues81.176.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax81.176.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments wst:ProprietaryProducts0.00.0

Selling General And Administrative Expense

us-gaap:SellingGeneralAndAdministrativeExpense

us-gaap:SellingGeneralAndAdministrativeExpense


Selling
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value80767677716964706859647068626160616058625854605558565756605659595853545146454850504445
Percentage of SellingGeneralAndAdministrativeExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax12.013.213.914.714.614.714.215.015.514.115.015.616.415.015.415.215.915.915.516.116.015.816.916.416.815.715.616.317.516.417.317.418.217.716.716.215.715.615.817.118.216.516.3

Assets

us-gaap:Assets

us-gaap:Assets


Assets
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-312009-12-31
Value27392793258223922246234121742036197819461873186918621930184317331716173517051695166616631596167016731704170816711577156415271462145713991398141512941271
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:Assets us-gaap:ConsolidationItems

us-gaap:CorporateNonSegment


Assetsus-gaap:
Period End2020-12-312019-12-31
Value583474
Percentage of Assets20.920.3
Percentage of Assets20.920.3
Percentage of Assets us-gaap:CorporateNonSegment100.0100.0

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

us-gaap:OperatingSegments, wst:ContractManufacturedProducts


Assetsus-gaap:
Period End2020-12-312019-12-31
Value411386
Percentage of Assets14.716.5
Percentage of Assets14.716.5
Percentage of Assets us-gaap:OperatingSegments wst:ContractManufacturedProducts100.0100.0

us-gaap:OperatingSegments, wst:ProprietaryProducts


Assetsus-gaap:
Period End2020-12-312019-12-31
Value17981480
Percentage of Assets64.463.2
Percentage of Assets64.463.2
Percentage of Assets us-gaap:OperatingSegments wst:ProprietaryProducts100.0100.0

Liabilities

us-gaap:Liabilities

us-gaap:Liabilities


Liabilities
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-312009-12-31
Value910939863786756768686666582594591564582613600564599593595671671674654714703732773765831835810783762744707719668691
Percentage of Liabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets33.233.633.432.933.732.831.632.729.430.531.630.231.331.832.632.634.934.234.939.640.340.541.042.742.042.945.345.852.753.453.153.552.353.250.650.851.754.4

Liabilities And Stockholders Equity

us-gaap:LiabilitiesAndStockholdersEquity

us-gaap:LiabilitiesAndStockholdersEquity


Liabilities
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-312009-12-31
Value27392793258223922246234121742036197819461873186918621930184317331716173517051695166616631596167016731704170816711577156415271462145713991398141512941271
Percentage of LiabilitiesAndStockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Stockholders Equity

us-gaap:StockholdersEquity

us-gaap:StockholdersEquity


Stockholders
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-31
Value18291854171816061490157314871445136913961279
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets66.866.466.667.166.367.268.40.067.370.668.7

us-gaap:StockholdersEquity us-gaap:StatementEquityComponents

us-gaap:AccumulatedDefinedBenefitPlansAdjustment


Stockholders
Period End2021-03-312020-12-312020-09-302020-06-302019-12-312018-12-31
Value-39.9-40.5-44.3-44.1-40.3-40.4
Percentage of StockholdersEquity-2.2-2.2-2.6-2.7-2.6-2.9
Percentage of Assets-1.5-1.4-1.7-1.8-1.7-2.0
Percentage of Assets us-gaap:AccumulatedDefinedBenefitPlansAdjustment0.00.00.00.00.00.0

us-gaap:AccumulatedGainLossNetCashFlowHedgeParent


Stockholders
Period End2021-03-312020-12-312020-09-302020-06-302019-12-31
Value-3.7-1.9-1.8-0.9-0.8
Percentage of StockholdersEquity-0.2-0.1-0.1-0.1-0.1
Percentage of Assets-0.1-0.1-0.1-0.0-0.0
Percentage of Assets us-gaap:AccumulatedGainLossNetCashFlowHedgeParent0.00.00.00.00.0

us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedges


Stockholders
Period End2020-12-312019-12-312018-12-31
Value-1.9-0.8-0.4
Percentage of StockholdersEquity-0.1-0.1-0.0
Percentage of Assets-0.1-0.0-0.0
Percentage of Assets us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedges0.00.00.0

us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss


Stockholders
Period End2021-03-312020-12-312020-09-302020-06-302019-12-312018-12-31
Value0.60.60.40.40.40.4
Percentage of StockholdersEquity0.00.00.00.00.00.0
Percentage of Assets0.00.00.00.00.00.0
Percentage of Assets us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss0.00.00.00.00.00.0

us-gaap:AccumulatedOtherComprehensiveIncome


Stockholders
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-31
Value-140.2-110.6-159.5-187.8-192.3-149.6-170.4-152.2-153.4-154.2-117.3
Percentage of StockholdersEquity-7.7-6.0-9.3-11.7-12.9-9.5-11.5-10.5-11.2-11.0-9.2
Percentage of Assets-5.1-4.0-6.2-7.9-8.6-6.4-7.80.0-7.5-7.8-6.3
Percentage of Assets us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedTranslationAdjustment


Stockholders
Period End2021-03-312020-12-312020-09-302020-06-302019-12-312018-12-31
Value-97.2-68.8-113.8-143.2-108.9-113.8
Percentage of StockholdersEquity-5.3-3.7-6.6-8.9-6.9-8.2
Percentage of Assets-3.5-2.5-4.4-6.0-4.7-5.8
Percentage of Assets us-gaap:AccumulatedTranslationAdjustment0.00.00.00.00.00.0

us-gaap:AdditionalPaidInCapital


Stockholders
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-31
Value246267268263267272268273278282309
Percentage of StockholdersEquity13.514.415.616.418.017.318.018.920.320.224.2
Percentage of Assets9.09.610.411.011.911.612.40.013.714.316.6
Percentage of Assets us-gaap:AdditionalPaidInCapital0.00.00.00.00.00.00.00.00.00.00.0

us-gaap:RetainedEarnings


Stockholders
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-31
Value19851846177317031611154914971452139813531178
Percentage of StockholdersEquity108.699.6103.2106.0108.298.5100.7100.5102.196.992.1
Percentage of Assets72.566.168.771.271.766.268.90.068.768.463.2
Percentage of Assets us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.0

us-gaap:TreasuryStock


Stockholders
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-31
Value-281.7-167.7-182.0-190.8-215.7-118.1-126.6-147.8-172.6-103.7-109.1
Percentage of StockholdersEquity-15.4-9.0-10.6-11.9-14.5-7.5-8.5-10.2-12.6-7.4-8.5
Percentage of Assets-10.3-6.0-7.0-8.0-9.6-5.0-5.80.0-8.5-5.2-5.9
Percentage of Assets us-gaap:TreasuryStock0.00.00.00.00.00.00.00.00.00.00.0

Assets Current

us-gaap:AssetsCurrent

us-gaap:AssetsCurrent


Assets
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-312009-12-31
Value132713731238111097710581004867894850766743743776717652641658659673680679625659679685686650589557557517502472503510436397
Percentage of AssetsCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets48.449.247.946.443.545.246.242.645.243.740.939.839.940.238.937.637.437.938.739.740.940.939.239.540.640.240.238.937.435.636.535.334.533.736.036.133.731.3

Cash And Cash Equivalents At Carrying Value

us-gaap:CashAndCashEquivalentsAtCarryingValue

us-gaap:CashAndCashEquivalentsAtCarryingValue


Cash
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302009-12-312008-12-312007-12-31
Value483615519445335439396326265337297225199235269226169203205202178274256252207255246226230230221190175161143107100911191109411097678387108
Percentage of CashAndCashEquivalentsAtCarryingValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets17.722.020.118.614.918.818.20.013.017.015.312.010.712.714.012.39.811.811.911.90.016.215.415.113.015.314.713.313.513.80.00.011.110.49.47.36.96.68.57.80.08.50.00.06.50.00.0

Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents


Cash
Period End2021-03-312020-12-312020-09-302020-03-312019-12-312019-09-302018-12-31
Value483615519335439396337
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets17.722.020.114.918.818.217.0

Accounts Receivable Net Current

us-gaap:AccountsReceivableNetCurrent

us-gaap:AccountsReceivableNetCurrent


Accounts
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-312009-12-31
Value465385373340333319316318288302296290253251242224200209219181194198189179195209208185189175182185176147153165126138
Percentage of AccountsReceivableNetCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets17.013.814.414.214.813.614.515.614.615.615.815.513.613.013.213.011.712.112.810.711.711.911.910.711.712.312.211.112.011.212.012.612.110.510.911.79.810.9

Inventory Net

us-gaap:InventoryNet

us-gaap:InventoryNet


Inventory
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-312009-12-31
Value310321294274251235230226214206208215215215211212199201197181187187183181185187187176173162165159158151155161147129
Percentage of InventoryNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets11.311.511.411.511.210.110.611.110.810.611.111.511.611.211.512.211.611.611.610.711.311.311.510.911.111.011.010.611.010.410.910.910.910.811.111.411.410.2

Other Assets Current

us-gaap:OtherAssetsCurrent

us-gaap:OtherAssetsCurrent


Other
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-312009-12-31
Value6751514958646157544336373940374639413936333336353244443435383632344665614238
Percentage of OtherAssetsCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets2.51.82.02.12.62.82.82.82.72.21.92.02.12.12.02.72.32.42.32.22.02.02.32.12.02.62.62.12.22.42.42.22.43.34.64.43.33.0

Noncurrent Assets

us-gaap:NoncurrentAssets

us-gaap:NoncurrentAssets


Noncurrent
Period End2020-12-312019-12-31
Value1011909
Percentage of NoncurrentAssets100.0100.0
Percentage of Assets36.238.8

us-gaap:NoncurrentAssets us-gaap:StatementGeographical

country:DE


Noncurrent
Period End2020-12-312019-12-31
Value112105
Percentage of NoncurrentAssets11.111.6
Percentage of Assets4.04.5
Percentage of Assets country:DE0.00.0

country:FR


Noncurrent
Period End2020-12-312019-12-31
Value7653
Percentage of NoncurrentAssets7.55.9
Percentage of Assets2.72.3
Percentage of Assets country:FR0.00.0

country:IE


Noncurrent
Period End2020-12-312019-12-31
Value197176
Percentage of NoncurrentAssets19.519.4
Percentage of Assets7.17.5
Percentage of Assets country:IE0.00.0

country:US


Noncurrent
Period End2020-12-312019-12-31
Value407364
Percentage of NoncurrentAssets40.340.1
Percentage of Assets14.615.6
Percentage of Assets country:US0.00.0

wst:OtherCountries


Noncurrent
Period End2020-12-312019-12-31
Value151149
Percentage of NoncurrentAssets15.016.4
Percentage of Assets5.46.4
Percentage of Assets wst:OtherCountries0.00.0

wst:OtherEuropeCountries


Noncurrent
Period End2020-12-312019-12-31
Value6659
Percentage of NoncurrentAssets6.66.6
Percentage of Assets2.42.5
Percentage of Assets wst:OtherEuropeCountries0.00.0

Property Plant And Equipment Gross

us-gaap:PropertyPlantAndEquipmentGross

us-gaap:PropertyPlantAndEquipmentGross


Property
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-312009-12-31
Value20282035193918581816182017791759175217451737177517451701164615831554155114981440139813801349139013811402138513691271127412261185118411361135114310771062
Percentage of PropertyPlantAndEquipmentGross100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets74.072.975.177.780.977.781.986.488.689.792.795.093.788.189.391.490.689.487.985.083.983.084.583.282.682.381.181.980.681.580.381.081.381.381.280.883.283.6

us-gaap:PropertyPlantAndEquipmentGross us-gaap:PropertyPlantAndEquipmentByType

us-gaap:BuildingAndBuildingImprovements


Property
Period End2020-12-312019-12-312018-12-312017-12-312014-12-312013-12-312012-12-312011-12-31
Value618572569539410397310284
Percentage of PropertyPlantAndEquipmentGross30.431.532.530.929.529.024.425.0
Percentage of Assets22.124.528.828.924.623.819.920.3
Percentage of Assets us-gaap:BuildingAndBuildingImprovements0.00.00.00.00.00.00.00.0

us-gaap:ConstructionInProgress


Property
Period End2020-12-312019-12-312018-12-312017-12-312014-12-312013-12-312012-12-312011-12-31
Value1921288913210497155116
Percentage of PropertyPlantAndEquipmentGross9.47.15.17.67.57.112.210.2
Percentage of Assets6.95.54.57.16.35.99.98.3
Percentage of Assets us-gaap:ConstructionInProgress0.00.00.00.00.00.00.00.0

us-gaap:Land


Property
Period End2020-12-312019-12-312018-12-312017-12-312014-12-312013-12-312012-12-312011-12-31
Value2422202115159.08.9
Percentage of PropertyPlantAndEquipmentGross1.21.21.21.21.11.10.70.8
Percentage of Assets0.90.91.11.10.90.90.60.6
Percentage of Assets us-gaap:Land0.00.00.00.00.00.00.00.0

us-gaap:MachineryAndEquipment


Property
Period End2020-12-312019-12-312018-12-312017-12-312014-12-312013-12-312012-12-312011-12-31
Value911817806793654655607565
Percentage of PropertyPlantAndEquipmentGross44.844.946.045.447.047.947.649.8
Percentage of Assets32.634.940.842.639.139.238.840.4
Percentage of Assets us-gaap:MachineryAndEquipment0.00.00.00.00.00.00.00.0

us-gaap:ToolsDiesAndMolds


Property
Period End2020-12-312019-12-312018-12-312017-12-312014-12-312013-12-312012-12-312011-12-31
Value13112311511494959085
Percentage of PropertyPlantAndEquipmentGross6.46.86.66.66.87.07.17.5
Percentage of Assets4.75.35.96.15.75.75.86.1
Percentage of Assets us-gaap:ToolsDiesAndMolds0.00.00.00.00.00.00.00.0

wst:ComputerHardwareAndSoftware


Property
Period End2020-12-312019-12-312018-12-312017-12-312014-12-312013-12-312012-12-312011-12-31
Value15715515114411110710276
Percentage of PropertyPlantAndEquipmentGross7.78.58.68.38.07.88.06.7
Percentage of Assets5.66.67.67.86.76.46.65.4
Percentage of Assets wst:ComputerHardwareAndSoftware0.00.00.00.00.00.00.00.0

Accumulated Depreciation Depletion And Amortization Property Plant And Equipment

us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment

us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment


Accumulated
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-312009-12-31
Value1097109210551018988980967945930923910917890865834800776778757719708694673685686693673657612605589565565543559562522485
Percentage of AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets40.139.140.942.644.041.944.546.447.047.548.649.147.844.945.346.245.244.944.442.442.541.842.241.041.140.739.439.338.938.738.638.638.838.840.039.740.438.2

Amortization Of Intangible Assets

us-gaap:AmortizationOfIntangibleAssets us-gaap:BusinessAcquisition

us-gaap:AmortizationOfIntangibleAssets

us-gaap:SeriesOfIndividuallyImmaterialBusinessAcquisitions


Amortization
Period End2020-12-312020-09-302020-06-30
Value700000.0700000.01100000.0
Percentage of AmortizationOfIntangibleAssets100.0100.0100.0
Percentage of Assets0.00.00.0
Percentage of Assets us-gaap:SeriesOfIndividuallyImmaterialBusinessAcquisitions0.00.00.0

us-gaap:AmortizationOfIntangibleAssets us-gaap:ConsolidationItems

us-gaap:CorporateNonSegment


Amortization
Period End2021-03-31
Value-200000.0
Percentage of AmortizationOfIntangibleAssets0.0
Percentage of Assets0.0
Percentage of Assets us-gaap:CorporateNonSegment0.0

us-gaap:MaterialReconcilingItems


Amortization
Period End2020-09-30
Value200000.0
Percentage of AmortizationOfIntangibleAssets28.6
Percentage of Assets0.0
Percentage of Assets us-gaap:MaterialReconcilingItems0.0

Property Plant And Equipment Net

us-gaap:PropertyPlantAndEquipmentNet

us-gaap:PropertyPlantAndEquipmentNet


Property
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-312009-12-31
Value930943883839828839812814822822826857855835811782778772741721689685675705694709712711658669637620619593576581554577
Percentage of PropertyPlantAndEquipmentNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets34.033.834.235.136.935.837.440.041.542.244.145.945.943.344.045.245.344.543.542.541.441.242.342.241.541.641.742.641.842.841.742.442.542.441.241.142.945.4

Investments In Affiliates Subsidiaries Associates And Joint Ventures

us-gaap:InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures

us-gaap:InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures


Investments
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-312009-12-31
Value2112142091991971929794919091898584838182817761595959606160596055596057585655514838
Percentage of InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets7.77.78.18.38.88.24.54.74.64.74.94.84.64.44.54.74.84.74.63.63.63.63.73.63.73.53.53.63.53.84.03.94.04.03.93.63.73.0

Goodwill

us-gaap:Goodwill

us-gaap:Goodwill


Goodwill
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-04-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-312009-12-31
Value1091111091071061071062.6105105106106108107107105103103105104104105105104108110114114114111112111110112111113116112114
Percentage of Goodwill100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets4.04.04.24.54.84.64.90.05.25.35.55.75.85.85.55.76.06.06.16.26.26.36.36.56.56.66.76.76.87.07.27.37.57.78.08.18.28.79.0

us-gaap:Goodwill us-gaap:StatementBusinessSegments

wst:ContractManufacturedProducts


Goodwillus-gaap:
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value3029293029
Percentage of Goodwill27.227.628.227.928.4
Percentage of Assets1.11.31.51.61.7
Percentage of Assets wst:ContractManufacturedProducts0.07.79.910.511.2

wst:ProprietaryProducts


Goodwillus-gaap:
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value8078767773
Percentage of Goodwill72.872.471.872.171.6
Percentage of Assets2.93.33.84.24.3
Percentage of Assets wst:ProprietaryProducts0.05.35.75.96.3

Intangible Assets Net Excluding Goodwill

us-gaap:IntangibleAssetsNetExcludingGoodwill

us-gaap:IntangibleAssetsNetExcludingGoodwill


Intangible
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-312009-12-31
Value2830303128292819202121222122222323242437383940424346474849505049515252545555
Percentage of IntangibleAssetsNetExcludingGoodwill100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.01.11.21.31.31.31.31.01.01.11.21.21.21.21.21.31.41.41.52.22.32.42.52.52.62.72.82.93.23.23.33.43.53.73.83.84.34.4

Finite Lived Intangible Assets Net

us-gaap:FiniteLivedIntangibleAssetsNet

us-gaap:FiniteLivedIntangibleAssetsNet


Finite
Period End2020-12-312019-12-312018-12-312017-12-312014-12-312013-12-312012-12-312011-12-31
Value3029202142485052
Percentage of FiniteLivedIntangibleAssetsNet100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.11.31.01.22.52.93.23.7

us-gaap:FiniteLivedIntangibleAssetsNet us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:CustomerContracts


Finite
Period End2020-12-312019-12-312018-12-312017-12-312014-12-312013-12-312012-12-312011-12-31
Value3.23.64.24.86.47.57.98.3
Percentage of FiniteLivedIntangibleAssetsNet10.512.120.722.115.215.515.616.0
Percentage of Assets0.10.20.20.30.40.40.50.6
Percentage of Assets us-gaap:CustomerContracts0.00.00.00.00.00.00.00.0

us-gaap:CustomerRelationships


Finite
Period End2020-12-312019-12-312018-12-312017-12-312014-12-312013-12-312012-12-312011-12-31
Value17189.31013151618
Percentage of FiniteLivedIntangibleAssetsNet57.462.845.847.031.431.333.235.6
Percentage of Assets0.60.80.50.50.80.91.11.3
Percentage of Assets us-gaap:CustomerRelationships0.00.00.00.00.00.00.00.0

us-gaap:InProcessResearchAndDevelopment


Finite
Period End2020-12-312019-12-312018-12-312017-12-312014-12-312013-12-312012-12-31
Value1.61.82.12.33.03.43.4
Percentage of FiniteLivedIntangibleAssetsNet5.26.010.310.67.17.06.7
Percentage of Assets0.10.10.10.10.20.20.2
Percentage of Assets us-gaap:InProcessResearchAndDevelopment0.00.00.00.00.00.00.0

us-gaap:Trademarks


Finite
Period End2020-12-312019-12-312018-12-312017-12-312014-12-312013-12-312012-12-312011-12-31
Value0.20.20.20.310111111
Percentage of FiniteLivedIntangibleAssetsNet0.70.71.01.425.722.821.921.5
Percentage of Assets0.00.00.00.00.60.70.70.8
Percentage of Assets us-gaap:Trademarks0.00.00.00.00.00.00.00.0

wst:PatentsAndLicensing


Finite
Period End2020-12-312019-12-312018-12-312017-12-312014-12-312013-12-312012-12-312011-12-31
Value8.05.54.54.18.6111110
Percentage of FiniteLivedIntangibleAssetsNet26.218.522.218.920.523.422.519.8
Percentage of Assets0.30.20.20.20.50.70.70.7
Percentage of Assets wst:PatentsAndLicensing0.00.00.00.00.00.00.00.0

Deferred Tax Assets Liabilities Net

us-gaap:DeferredTaxAssetsLiabilitiesNet

us-gaap:DeferredTaxAssetsLiabilitiesNet


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312014-12-312013-12-312012-12-312011-12-31
Value5.6-1.5111557587670
Percentage of DeferredTaxAssetsLiabilitiesNet100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.2-0.10.60.83.53.54.95.0

Operating Lease Right Of Use Asset

us-gaap:OperatingLeaseRightOfUseAsset

us-gaap:OperatingLeaseRightOfUseAsset


Operating
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-03-312018-12-31
Value64686768687071750.0
Percentage of OperatingLeaseRightOfUseAsset100.0100.0100.0100.0100.0100.0100.0100.00.0
Percentage of Assets2.42.42.62.93.03.03.33.70.0

Other Assets Noncurrent

us-gaap:OtherAssetsNoncurrent

us-gaap:OtherAssetsNoncurrent


Other
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-312009-12-31
Value2423212122242026202121212316162121222226252727282224232424242424282829302219
Percentage of OtherAssetsNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.90.80.80.91.01.10.91.31.01.11.11.21.30.90.91.21.21.31.31.61.51.61.71.71.41.41.41.41.51.61.61.72.02.12.12.11.71.5

Accounts Payable Current

us-gaap:AccountsPayableCurrent

us-gaap:AccountsPayableCurrent


Accounts
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-312009-12-31
Value20421318016215715614513713012512612713812113010612299107119939188103919498108911028185828971736368
Percentage of AccountsPayableCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets7.57.67.06.87.06.76.76.86.66.46.76.87.46.37.16.17.15.76.37.15.65.55.56.25.55.55.86.55.86.65.35.95.76.45.15.24.95.4

Accrued Income Taxes Current

us-gaap:AccruedIncomeTaxesCurrent

us-gaap:AccruedIncomeTaxesCurrent


Accrued
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-312009-12-31
Value49263029136.419179.81717136.07.42.46.24.53.29.312191815141815121416151914137.87.96.15.05.7
Percentage of AccruedIncomeTaxesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.80.91.21.20.60.30.90.80.50.91.00.70.30.40.10.40.30.20.50.81.11.10.90.91.10.90.70.91.01.01.31.00.90.60.60.40.40.4

Debt Current

us-gaap:DebtCurrent

us-gaap:DebtCurrent


Debt
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-312009-12-31
Value2.32.32.32.32.32.30.00.00.10.00.00.00.03333342.42.62.56971959827272.2142.21.73239898650546.30.30.5
Percentage of DebtCurrent100.0100.0100.0100.0100.0100.00.00.0100.00.00.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.10.10.10.10.10.10.00.00.00.00.00.00.01.71.82.00.10.10.14.14.35.76.21.61.60.10.80.10.12.12.66.15.93.63.90.40.00.0

Dividends Payable Current

us-gaap:DividendsPayableCurrent

us-gaap:DividendsPayableCurrent


Dividends
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value121111109.5
Percentage of DividendsPayableCurrent100.0100.0100.0100.0100.0
Percentage of Assets0.50.50.60.60.6

Liabilities Current

us-gaap:LiabilitiesCurrent

us-gaap:LiabilitiesCurrent


Liabilities
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-312009-12-31
Value482503447375344341335301283288287263279300289256241236239314299313296252242221227236208261275320302243229192169171
Percentage of LiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets17.618.017.315.715.314.615.414.814.314.815.314.115.015.515.714.814.013.614.018.518.018.918.615.114.513.013.314.213.216.718.021.920.817.416.413.613.113.5

Long Term Debt Current

us-gaap:LongTermDebtCurrent us-gaap:LongtermDebtType

us-gaap:LongTermDebtCurrent

wst:TermLoanDue2024


Long
Period End2020-12-31
Value2300000.0
Percentage of LongTermDebtCurrent100.0
Percentage of Assets0.1
Percentage of Assets wst:TermLoanDue20240.0

Operating Lease Liability Current

us-gaap:OperatingLeaseLiabilityCurrent

us-gaap:OperatingLeaseLiabilityCurrent


Operating
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-03-312018-12-31
Value9.4109.99.89.49.69.8100.0
Percentage of OperatingLeaseLiabilityCurrent100.0100.0100.0100.0100.0100.0100.0100.00.0
Percentage of Assets0.30.40.40.40.40.40.50.50.0

Other Liabilities Current

us-gaap:OtherLiabilitiesCurrent

us-gaap:OtherLiabilitiesCurrent


Other
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-312009-12-31
Value1441431269997918680767686697772716358675953575353515255584345437071693832434039
Percentage of OtherLiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets5.35.14.94.24.33.94.03.93.93.94.63.74.13.73.93.73.43.93.53.23.53.23.33.13.13.33.42.62.92.84.64.94.72.82.33.13.23.1

Long Term Debt

us-gaap:LongTermDebt

us-gaap:LongTermDebt


Long
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-03-312018-12-312018-09-302018-06-302017-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-03-312012-12-312012-09-302012-06-302012-03-312011-12-31
Value254255255256256257195195196196196197302326330336342361404373430411401385289349
Percentage of LongTermDebt100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets9.39.19.910.711.411.09.09.69.910.110.510.618.219.620.720.220.521.223.722.327.326.326.326.419.925.0

Long Term Debt Noncurrent

us-gaap:LongTermDebtNoncurrent

us-gaap:LongTermDebtNoncurrent


Long
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-312009-12-31
Value252252253253254255195195196196196198197196195194226228228228231231231309315359390371428378362296294299323367358379
Percentage of LongTermDebtNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets9.29.19.810.611.310.99.09.69.910.110.510.610.610.210.611.213.213.213.413.513.913.914.518.518.921.122.922.227.224.223.720.320.221.423.125.927.729.8

us-gaap:LongTermDebtNoncurrent us-gaap:LongtermDebtType

wst:TermLoanDue2024


Long
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-31
Value848586868787
Percentage of LongTermDebtNoncurrent33.733.834.034.134.234.4
Percentage of Assets3.13.13.33.63.93.7
Percentage of Assets wst:TermLoanDue20240.00.00.00.00.00.0

Deferred Income Tax Liabilities Net

us-gaap:DeferredIncomeTaxLiabilitiesNet

us-gaap:DeferredIncomeTaxLiabilitiesNet


Deferred
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-31
Value12104.50.05.615
Percentage of DeferredIncomeTaxLiabilitiesNet100.0100.0100.00.0100.0100.0
Percentage of Assets0.40.40.20.00.20.7

Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent

us-gaap:PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent

us-gaap:PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent


Pension
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-312009-12-31
Value5557515250524654565353555362605775626162816361837579828313513511411211112684928785
Percentage of PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets2.02.12.02.22.32.22.22.72.82.82.92.92.93.23.33.34.43.63.63.74.93.83.85.04.54.64.85.08.68.77.57.77.69.06.06.56.76.7

us-gaap:PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent us-gaap:RetirementPlanType

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Pension
Period End2020-12-312019-12-312018-12-312017-12-31
Value5.45.95.36.4
Percentage of PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent9.411.29.412.0
Percentage of Assets0.20.30.30.3
Percentage of Assets us-gaap:OtherPostretirementBenefitPlansDefinedBenefit0.00.00.00.0

us-gaap:PensionPlansDefinedBenefit


Pension
Period End2020-12-312019-12-312018-12-312017-12-31
Value52465047
Percentage of PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent90.688.890.688.0
Percentage of Assets1.92.02.62.5
Percentage of Assets us-gaap:PensionPlansDefinedBenefit0.00.00.00.0

Other Liabilities Noncurrent

us-gaap:OtherLiabilitiesNoncurrent

us-gaap:OtherLiabilitiesNoncurrent


Other
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-312009-12-31
Value2831464340413534334342354246464747495153484949525152525539383735335450463333
Percentage of OtherLiabilitiesNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.01.11.81.81.81.81.61.71.72.32.31.92.32.42.52.72.72.93.03.22.93.03.13.13.13.13.13.32.52.42.52.42.33.93.63.32.62.7

Operating Lease Liability Noncurrent

us-gaap:OperatingLeaseLiabilityNoncurrent

us-gaap:OperatingLeaseLiabilityNoncurrent


Operating
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-03-312018-12-31
Value57605960616263670.0
Percentage of OperatingLeaseLiabilityNoncurrent100.0100.0100.0100.0100.0100.0100.0100.00.0
Percentage of Assets2.12.22.32.52.72.72.93.30.0

Lessee Operating Lease Liability Payments Due Year Two

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo


Lessee
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-31
Value9.2109.79.61010
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearTwo100.0100.0100.0100.0100.0100.0
Percentage of Assets0.30.40.40.40.50.4

Lessee Operating Lease Liability Payments Due Year Three

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree


Lessee
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-31
Value8500000.09300000.08700000.08600000.09200000.08600000.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearThree100.0100.0100.0100.0100.0100.0
Percentage of Assets0.30.30.30.40.40.4

Lessee Operating Lease Liability Payments Due Year Four

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour


Lessee
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-31
Value6600000.08700000.08200000.08100000.08200000.07800000.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearFour100.0100.0100.0100.0100.0100.0
Percentage of Assets0.20.30.30.30.40.3

Lessee Operating Lease Liability Payments Due Year Five

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive


Lessee
Period End2020-12-312020-03-312019-12-31
Value6900000.07700000.07300000.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearFive100.0100.0100.0
Percentage of Assets0.20.30.3

Lessee Operating Lease Liability Payments Due After Year Five

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive


Lessee
Period End2020-12-312020-03-312019-12-31
Value374141
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive100.0100.0100.0
Percentage of Assets1.31.81.8

Operating Lease Liability

us-gaap:OperatingLeaseLiability

us-gaap:OperatingLeaseLiability


Operating
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-03-31
Value6670697070727377
Percentage of OperatingLeaseLiability100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets2.42.52.73.03.13.13.43.8

Lessee Operating Lease Liability Payments Due

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue


Lessee
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-31
Value808584858688
Percentage of LesseeOperatingLeaseLiabilityPaymentsDue100.0100.0100.0100.0100.0100.0
Percentage of Assets2.93.03.33.63.83.8

Lessee Operating Lease Liability Undiscounted Excess Amount

us-gaap:LesseeOperatingLeaseLiabilityUndiscountedExcessAmount

us-gaap:LesseeOperatingLeaseLiabilityUndiscountedExcessAmount


Lessee
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-31
Value131414151516
Percentage of LesseeOperatingLeaseLiabilityUndiscountedExcessAmount100.0100.0100.0100.0100.0100.0
Percentage of Assets0.50.50.60.60.70.7

Stockholders Equity

us-gaap:StockholdersEquity

us-gaap:StockholdersEquity


Stockholders
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-31
Value18291854171816061490157314871445136913961279
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets66.866.466.667.166.367.268.40.067.370.668.7

us-gaap:StockholdersEquity us-gaap:StatementEquityComponents

us-gaap:AccumulatedDefinedBenefitPlansAdjustment


Stockholders
Period End2021-03-312020-12-312020-09-302020-06-302019-12-312018-12-31
Value-39.9-40.5-44.3-44.1-40.3-40.4
Percentage of StockholdersEquity-2.2-2.2-2.6-2.7-2.6-2.9
Percentage of Assets-1.5-1.4-1.7-1.8-1.7-2.0
Percentage of Assets us-gaap:AccumulatedDefinedBenefitPlansAdjustment0.00.00.00.00.00.0

us-gaap:AccumulatedGainLossNetCashFlowHedgeParent


Stockholders
Period End2021-03-312020-12-312020-09-302020-06-302019-12-31
Value-3.7-1.9-1.8-0.9-0.8
Percentage of StockholdersEquity-0.2-0.1-0.1-0.1-0.1
Percentage of Assets-0.1-0.1-0.1-0.0-0.0
Percentage of Assets us-gaap:AccumulatedGainLossNetCashFlowHedgeParent0.00.00.00.00.0

us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedges


Stockholders
Period End2020-12-312019-12-312018-12-31
Value-1.9-0.8-0.4
Percentage of StockholdersEquity-0.1-0.1-0.0
Percentage of Assets-0.1-0.0-0.0
Percentage of Assets us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedges0.00.00.0

us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss


Stockholders
Period End2021-03-312020-12-312020-09-302020-06-302019-12-312018-12-31
Value0.60.60.40.40.40.4
Percentage of StockholdersEquity0.00.00.00.00.00.0
Percentage of Assets0.00.00.00.00.00.0
Percentage of Assets us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss0.00.00.00.00.00.0

us-gaap:AccumulatedOtherComprehensiveIncome


Stockholders
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-31
Value-140.2-110.6-159.5-187.8-192.3-149.6-170.4-152.2-153.4-154.2-117.3
Percentage of StockholdersEquity-7.7-6.0-9.3-11.7-12.9-9.5-11.5-10.5-11.2-11.0-9.2
Percentage of Assets-5.1-4.0-6.2-7.9-8.6-6.4-7.80.0-7.5-7.8-6.3
Percentage of Assets us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedTranslationAdjustment


Stockholders
Period End2021-03-312020-12-312020-09-302020-06-302019-12-312018-12-31
Value-97.2-68.8-113.8-143.2-108.9-113.8
Percentage of StockholdersEquity-5.3-3.7-6.6-8.9-6.9-8.2
Percentage of Assets-3.5-2.5-4.4-6.0-4.7-5.8
Percentage of Assets us-gaap:AccumulatedTranslationAdjustment0.00.00.00.00.00.0

us-gaap:AdditionalPaidInCapital


Stockholders
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-31
Value246267268263267272268273278282309
Percentage of StockholdersEquity13.514.415.616.418.017.318.018.920.320.224.2
Percentage of Assets9.09.610.411.011.911.612.40.013.714.316.6
Percentage of Assets us-gaap:AdditionalPaidInCapital0.00.00.00.00.00.00.00.00.00.00.0

us-gaap:RetainedEarnings


Stockholders
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-31
Value19851846177317031611154914971452139813531178
Percentage of StockholdersEquity108.699.6103.2106.0108.298.5100.7100.5102.196.992.1
Percentage of Assets72.566.168.771.271.766.268.90.068.768.463.2
Percentage of Assets us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.0

us-gaap:TreasuryStock


Stockholders
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-31
Value-281.7-167.7-182.0-190.8-215.7-118.1-126.6-147.8-172.6-103.7-109.1
Percentage of StockholdersEquity-15.4-9.0-10.6-11.9-14.5-7.5-8.5-10.2-12.6-7.4-8.5
Percentage of Assets-10.3-6.0-7.0-8.0-9.6-5.0-5.80.0-8.5-5.2-5.9
Percentage of Assets us-gaap:TreasuryStock0.00.00.00.00.00.00.00.00.00.00.0

Common Stock Value

us-gaap:CommonStockValue

us-gaap:CommonStockValue


Common
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value1818181818181818181818181818181818181818181818171717171717171717
Percentage of CommonStockValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.70.70.70.80.80.80.90.91.01.01.01.01.01.01.01.11.11.11.11.11.11.11.11.11.11.01.01.11.11.21.31.4

Additional Paid In Capital

us-gaap:AdditionalPaidInCapital

us-gaap:AdditionalPaidInCapital


Additional
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value24626726826326727226827828228230430830930229227626024724020719518817016014913812912079767772
Percentage of AdditionalPaidInCapital100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets9.09.610.411.011.911.612.413.714.314.516.316.516.615.715.915.915.214.314.112.311.711.310.79.68.98.17.67.25.15.56.05.7

Retained Earnings Accumulated Deficit

us-gaap:RetainedEarningsAccumulatedDeficit

us-gaap:RetainedEarningsAccumulatedDeficit


Retained
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value1985184617731703161115491497139813531312125812221178118811481118107110411013964939947927902878855825805719664612569
Percentage of RetainedEarningsAccumulatedDeficit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets72.566.168.771.271.766.268.968.768.467.567.165.463.261.662.364.562.460.059.556.956.456.958.154.052.550.248.348.246.047.547.344.8

Accumulated Other Comprehensive Income Loss Net Of Tax

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax


Accumulated
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-03-312012-12-312011-12-312010-12-312009-12-31
Value-140.2-110.6-159.5-187.8-192.3-149.6-170.4-153.4-154.2-153.8-143.7-95.8-117.3-130.6-151.8-179.0-186.8-143.8-150.3-162.6-154.4-160.2-170.3-119.2-71.3-34.7-33.8-32.4-92.5-75.9-71.5-31.3-19.7
Percentage of AccumulatedOtherComprehensiveIncomeLossNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets-5.1-4.0-6.2-7.9-8.6-6.4-7.8-7.5-7.8-7.9-7.7-5.1-6.3-6.8-8.2-10.3-10.9-8.3-8.8-9.6-9.3-9.6-10.7-7.1-4.3-2.0-2.0-1.9-5.9-4.9-5.1-2.4-1.5

Treasury Stock Value

us-gaap:TreasuryStockValue

us-gaap:TreasuryStockValue


Treasury
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value2811671821902151181261721031081551491096264654621134.04.04.04.24.14.24.24.23.83.0234152
Percentage of TreasuryStockValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets10.36.07.08.09.65.05.88.55.25.68.38.05.93.23.53.82.71.30.80.20.20.20.30.20.30.20.20.20.21.63.24.1

Net Cash Provided By Used In Operating Activities

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInOperatingActivities


Net
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value88148118148571061081054773888245817585207168763.06877-1.94663648.868537918695152134139399.54748
Percentage of NetCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax13.225.621.628.111.622.623.722.410.717.320.518.310.819.619.021.55.318.818.219.60.820.021.5-0.613.218.017.42.520.115.623.15.621.717.016.14.414.213.512.93.217.117.7

Net Cash Provided By Used In Investing Activities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities


Net
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value-54500000.0-57600000.0-49100000.0-40900000.0-31900000.0-120600000.0-31600000.0-47100000.0-28700000.0-28600000.0-26500000.0-17000000.0-28700000.0-29400000.0-34000000.0-35500000.0-34700000.0-46700000.0-47900000.0-42600000.0-38600000.0-29500000.0-25500000.0-30600000.0-26300000.0-20700000.0-21400000.0-35600000.0-38900000.0-29100000.0-24200000.0-57700000.0-22700000.0-25500000.0-35900000.0-31900000.0-36300000.0-32000000.0-23100000.0-29100000.0-18600000.0-18800000.0
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-8.1-9.9-9.0-7.8-6.5-25.6-6.9-10.0-6.5-6.8-6.1-3.8-6.9-7.1-8.5-8.9-9.0-12.2-12.7-11.0-10.7-8.6-7.1-9.1-7.5-5.8-5.8-10.3-11.4-8.5-7.0-17.0-7.1-8.4-11.1-10.1-12.3-10.9-7.5-9.9-6.7-6.9

Net Cash Provided By Used In Financing Activities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities


Net
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value-156.4-8.7-7.2-0.9-120.351-0.43.1-90.5-8.210-25.7-56.9-86.5-3.02.3-21.8-26.4-15.0-7.4-65.1-30.4-10.71.2-1.8-10.0-45.226-23.53.1-40.255-29.57.7-5.824-28.16.1-2.80.1-14.6-4.2
Percentage of NetCashProvidedByUsedInFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-23.3-1.5-1.3-0.2-24.510.8-0.10.7-20.4-1.92.3-5.7-13.7-20.8-0.80.6-5.6-6.9-4.0-1.9-18.0-8.8-3.00.4-0.5-2.8-12.37.6-6.90.9-11.716.4-9.22.5-1.87.7-9.52.1-0.90.0-5.3-1.5

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

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect


Cash
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value-131.89673110-103.8436961-71.9
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-19.716.613.421.0-21.19.215.213.0-16.2

Increase Decrease In Other Operating Capital Net

us-gaap:IncreaseDecreaseInOtherOperatingCapitalNet

us-gaap:IncreaseDecreaseInOtherOperatingCapitalNet


Increase
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value94-93.3200.64.3-10.2-0.70.50.8-32.30.60.72.77.8-0.40.43.2-33.2-9.4591.06.6-12.661-43.3-7.40.443-27.2-0.7-25.237-43.8-12.20.236-19.5-5.41.031
Percentage of IncreaseDecreaseInOtherOperatingCapitalNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Net Cash Provided By Used In Operating Activities

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInOperatingActivities


Net
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value88148118148571061081054773888245817585207168763.06877-1.94663648.868537918695152134139399.54748
Percentage of NetCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax13.225.621.628.111.622.623.722.410.717.320.518.310.819.619.021.55.318.818.219.60.820.021.5-0.613.218.017.42.520.115.623.15.621.717.016.14.414.213.512.93.217.117.7

Net Income Loss

us-gaap:NetIncomeLoss

us-gaap:NetIncomeLoss


Net
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312012-03-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value1519882917463566655291620196.01721
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax22.517.015.017.315.113.612.314.112.59.25.86.56.62.26.67.7

us-gaap:NetIncomeLoss us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome

us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome


Net
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value-1.30.3-0.21.10.51.1-4.33.4
Percentage of NetIncomeLoss-0.90.3-0.21.20.71.7-7.65.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-0.20.1-0.00.20.10.2-0.90.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.0

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

us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:AccumulatedDefinedBenefitPlansAdjustment


Net
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value-0.5-0.1-0.5-0.6-1.0-0.4-1.80.1
Percentage of NetIncomeLoss-0.3-0.1-0.6-0.7-1.3-0.6-3.20.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-0.1-0.0-0.1-0.1-0.2-0.1-0.40.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome us-gaap:AccumulatedDefinedBenefitPlansAdjustment0.00.00.00.00.00.00.00.0

us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:AccumulatedGainLossNetCashFlowHedgeParent


Net
Period End2021-03-312020-09-302020-06-302020-03-312019-09-302019-06-30
Value-0.80.31.71.5-2.53.3
Percentage of NetIncomeLoss-0.50.41.92.0-4.45.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-0.10.10.30.3-0.50.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome us-gaap:AccumulatedGainLossNetCashFlowHedgeParent0.00.00.00.00.00.0

us-gaap:NetIncomeLoss us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings


Net
Period End2021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-31
Value151829174566655
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax22.515.017.315.112.314.112.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:RetainedEarnings0.00.00.00.00.00.00.0

Share Based Compensation

us-gaap:ShareBasedCompensation

us-gaap:ShareBasedCompensation


Share
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value5.96.49.9125.45.65.47.26.20.45.36.03.42.54.65.53.55.44.64.94.63.6155.36.13.64.64.35.65.25.05.4
Percentage of ShareBasedCompensation100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ShareBasedCompensation us-gaap:ConsolidationItems

us-gaap:CorporateNonSegment


Share
Period End2021-03-312020-03-31
Value-5.9-5.4
Percentage of ShareBasedCompensation-100.0-100.0

Net Cash Provided By Used In Investing Activities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities


Net
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value-54500000.0-57600000.0-49100000.0-40900000.0-31900000.0-120600000.0-31600000.0-47100000.0-28700000.0-28600000.0-26500000.0-17000000.0-28700000.0-29400000.0-34000000.0-35500000.0-34700000.0-46700000.0-47900000.0-42600000.0-38600000.0-29500000.0-25500000.0-30600000.0-26300000.0-20700000.0-21400000.0-35600000.0-38900000.0-29100000.0-24200000.0-57700000.0-22700000.0-25500000.0-35900000.0-31900000.0-36300000.0-32000000.0-23100000.0-29100000.0-18600000.0-18800000.0
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-8.1-9.9-9.0-7.8-6.5-25.6-6.9-10.0-6.5-6.8-6.1-3.8-6.9-7.1-8.5-8.9-9.0-12.2-12.7-11.0-10.7-8.6-7.1-9.1-7.5-5.8-5.8-10.3-11.4-8.5-7.0-17.0-7.1-8.4-11.1-10.1-12.3-10.9-7.5-9.9-6.7-6.9

Payments To Acquire Property Plant And Equipment

us-gaap:PaymentsToAcquirePropertyPlantAndEquipment

us-gaap:PaymentsToAcquirePropertyPlantAndEquipment


Payments
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value545747373237312828302620282934293747483539292630272824313829226132293732332418192117
Percentage of PaymentsToAcquirePropertyPlantAndEquipment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Net Cash Provided By Used In Financing Activities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities


Net
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value-156.4-8.7-7.2-0.9-120.351-0.43.1-90.5-8.210-25.7-56.9-86.5-3.02.3-21.8-26.4-15.0-7.4-65.1-30.4-10.71.2-1.8-10.0-45.226-23.53.1-40.255-29.57.7-5.824-28.16.1-2.80.1-14.6-4.2
Percentage of NetCashProvidedByUsedInFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-23.3-1.5-1.3-0.2-24.510.8-0.10.7-20.4-1.92.3-5.7-13.7-20.8-0.80.6-5.6-6.9-4.0-1.9-18.0-8.8-3.00.4-0.5-2.8-12.37.6-6.90.9-11.716.4-9.22.5-1.87.7-9.52.1-0.90.0-5.3-1.5

Payments Of Dividends Common Stock

us-gaap:PaymentsOfDividendsCommonStock

us-gaap:PaymentsOfDividendsCommonStock


Payments
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value12121111111111111111101010109.69.69.59.68.78.88.77.97.97.97.97.17.07.17.16.66.66.56.66.16.16.16.15.76.05.45.75.3
Percentage of PaymentsOfDividendsCommonStock100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Payments For Repurchase Of Common Stock

us-gaap:PaymentsForRepurchaseOfCommonStock

us-gaap:PaymentsForRepurchaseOfCommonStock


Payments
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-09-302012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value1370.00.00.01150.00.00.0830.00.02247470.00.026259.68.19.10.02.50.01.60.60.00.01.42.10.1-0.1
Percentage of PaymentsForRepurchaseOfCommonStock100.00.00.00.0100.00.00.00.0100.00.00.0100.0100.0100.00.00.0100.0100.0100.0100.0100.00.0100.00.0100.0100.00.00.0100.0100.0100.0100.0

Effective Income Tax Rate Continuing Operations

us-gaap:EffectiveIncomeTaxRateContinuingOperations

us-gaap:EffectiveIncomeTaxRateContinuingOperations


Effective
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value16.4-0.121.60.1560.1740.0040.1680.1940.2310.0210.1310.0990.2330.2470.2230.0710.0360.0060.2930.2860.2480.2550.2840.0020.2820.2770.2760.0150.2970.2650.22-0.0150.4040.3270.261-0.0040.30.2250.249-0.0530.2130.246
Percentage of EffectiveIncomeTaxRateContinuingOperations100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

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

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber


Share
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value2400000.02700000.03000000.03500000.04500000.05000000.04600000.04800000.02800000.02900000.02900000.02700000.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

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

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice


Share
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value81.3767.0258.9348.7638.1131.7725.4921.9939.6735.7632.3229.09
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Deferred Tax Assets Net

us-gaap:DeferredTaxAssetsNet

us-gaap:DeferredTaxAssetsNet


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312014-12-312013-12-312012-12-312011-12-31
Value54435155102104122118
Percentage of DeferredTaxAssetsNet100.0100.0100.0100.0100.0100.0100.0100.0

Unrecognized Tax Benefits

us-gaap:UnrecognizedTaxBenefits

us-gaap:UnrecognizedTaxBenefits


Unrecognized
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value105.03.93.26.26.97.16.86.35.0
Percentage of UnrecognizedTaxBenefits100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Deferred Tax Assets Valuation Allowance

us-gaap:DeferredTaxAssetsValuationAllowance

us-gaap:DeferredTaxAssetsValuationAllowance


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312014-12-312013-12-312012-12-312011-12-31
Value1515162022232019
Percentage of DeferredTaxAssetsValuationAllowance100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AdjustmentForAmortization

us-gaap:AdjustmentForAmortization


Adjustment
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value1100000.01100000.01200000.01000000.01100000.0900000.0900000.01000000.0600000.0700000.0700000.0600000.0700000.0500000.0500000.0700000.0700000.0600000.0700000.0600000.0700000.0900000.01100000.01000000.01100000.01800000.01100000.01200000.01000000.01100000.01000000.01100000.01000000.0900000.01100000.01100000.01200000.01100000.01100000.01200000.01100000.01100000.0
Percentage of AdjustmentForAmortization100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1

us-gaap:BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1


Business
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value700000.0300000.0800000.0100000.001700000.0100000.0100000.0200000.0-3400000.0200000.0300000.0300000.0-2900000.0-200000.0400000.0300000.0400000.001700000.0200000.0500000.0100000.0200000.0100000.0300000.0300000.0400000.0500000.0300000.0200000.00
Percentage of BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0

us-gaap:ChangeInUnrealizedGainLossOnFairValueHedgingInstruments1 us-gaap:IncomeStatementLocation

us-gaap:ChangeInUnrealizedGainLossOnFairValueHedgingInstruments1

us-gaap:ForeignCurrencyGainLoss


Change
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value-9.93.49.3-1.217-1.2-8.45.5
Percentage of ChangeInUnrealizedGainLossOnFairValueHedgingInstruments1100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ChangeInUnrealizedGainLossOnHedgedItemInFairValueHedge1 us-gaap:IncomeStatementLocation

us-gaap:ChangeInUnrealizedGainLossOnHedgedItemInFairValueHedge1

us-gaap:ForeignCurrencyGainLoss


Change
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value9.9-3.4-9.31.2-17.21.28.4-5.5
Percentage of ChangeInUnrealizedGainLossOnHedgedItemInFairValueHedge1100.0100.0100.0100.0100.0100.0100.0100.0

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

us-gaap:ConcentrationRiskPercentage1

us-gaap:SalesRevenueNet, us-gaap:CustomerConcentrationRisk


Concentration
Period End2021-03-312020-09-302020-06-302020-03-312019-09-302019-06-30
Value100.0100.01.0100.0100.01.0
Percentage of ConcentrationRiskPercentage1100.0100.0100.0100.0100.0100.0

us-gaap:SalesRevenueNet, us-gaap:GeographicConcentrationRisk


Concentration
Period End2021-03-312020-09-302020-06-302020-03-312019-09-302019-06-30
Value100.0100.01.0100.0100.01.0
Percentage of ConcentrationRiskPercentage1100.0100.0100.0100.0100.0100.0

us-gaap:SalesRevenueNet, us-gaap:ProductConcentrationRisk


Concentration
Period End2021-03-312020-09-302020-06-302020-03-312019-09-302019-06-30
Value100.0100.01.0100.0100.01.0
Percentage of ConcentrationRiskPercentage1100.0100.0100.0100.0100.0100.0

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

wst:BiologicsCustomers, us-gaap:SalesRevenueNet, us-gaap:CustomerConcentrationRisk


Concentration
Period End2021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-03-312017-09-30
Value39.032.00.280.280.260.250.260.210.210.23
Percentage of ConcentrationRiskPercentage139.032.028.00.30.325.00.00.00.00.0

wst:ContractManufacturedCustomers, us-gaap:SalesRevenueNet, us-gaap:CustomerConcentrationRisk


Concentration
Period End2021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-03-312017-09-30
Value19.023.00.240.240.240.230.230.240.220.22
Percentage of ConcentrationRiskPercentage119.023.024.00.20.223.00.00.00.00.0

wst:GenericsCustomers, us-gaap:SalesRevenueNet, us-gaap:CustomerConcentrationRisk


Concentration
Period End2021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-03-312017-09-30
Value18.018.00.210.190.20.210.20.210.210.22
Percentage of ConcentrationRiskPercentage118.018.021.00.20.221.00.00.00.00.0

wst:PharmaCustomers, us-gaap:SalesRevenueNet, us-gaap:CustomerConcentrationRisk


Concentration
Period End2021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-03-312017-09-30
Value24.027.00.270.290.30.310.310.340.360.33
Percentage of ConcentrationRiskPercentage124.027.027.00.30.331.00.00.00.00.0

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

wst:ContractManufacturedProducts, us-gaap:SalesRevenueNet, us-gaap:ProductConcentrationRisk


Concentration
Period End2021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-03-312017-09-30
Value19.023.00.240.240.240.230.230.240.220.22
Percentage of ConcentrationRiskPercentage119.023.024.00.20.223.00.00.00.00.0

wst:DeliveryDevices, us-gaap:SalesRevenueNet, us-gaap:ProductConcentrationRisk


Concentration
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-03-312017-09-30
Value5.00.060.050.060.040.040.040.030.04
Percentage of ConcentrationRiskPercentage15.06.00.10.14.00.00.00.00.0

wst:HighValueComponents, us-gaap:SalesRevenueNet, us-gaap:ProductConcentrationRisk


Concentration
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-03-312017-09-30
Value47.00.440.430.420.440.430.410.410.42
Percentage of ConcentrationRiskPercentage147.044.00.40.444.00.00.00.00.0

wst:HighValueProductComponents, us-gaap:SalesRevenueNet, us-gaap:ProductConcentrationRisk


Concentration
Period End2021-03-312020-03-31
Value52.043.0
Percentage of ConcentrationRiskPercentage152.043.0

wst:StandardPackaging, us-gaap:SalesRevenueNet, us-gaap:ProductConcentrationRisk


Concentration
Period End2021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-03-312017-09-30
Value24.025.00.260.280.280.290.30.310.340.32
Percentage of ConcentrationRiskPercentage124.025.026.00.30.329.00.00.00.00.0

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

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


Concentration
Period End2021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-03-312017-09-30
Value46.049.00.50.480.480.490.460.510.450.5
Percentage of ConcentrationRiskPercentage146.049.050.00.50.549.00.00.00.00.0

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


Concentration
Period End2021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-03-312017-09-30
Value10.09.00.080.080.080.080.070.080.080.08
Percentage of ConcentrationRiskPercentage110.09.08.00.10.18.00.00.00.00.0

us-gaap:EMEA, us-gaap:SalesRevenueNet, us-gaap:GeographicConcentrationRisk


Concentration
Period End2021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-03-312017-09-30
Value44.042.00.420.440.440.430.470.410.470.42
Percentage of ConcentrationRiskPercentage144.042.042.00.40.443.00.00.00.00.0

us-gaap:ContractWithCustomerLiabilityChangeInTimeframePerformanceObligationSatisfiedRevenueRecognized

us-gaap:ContractWithCustomerLiabilityChangeInTimeframePerformanceObligationSatisfiedRevenueRecognized


Contract
Period End2021-03-312020-12-31
Value12-0.4
Percentage of ContractWithCustomerLiabilityChangeInTimeframePerformanceObligationSatisfiedRevenueRecognized100.0100.0

us-gaap:ContractWithCustomerLiabilityRevenueRecognized

us-gaap:ContractWithCustomerLiabilityRevenueRecognized


Contract
Period End2021-03-312019-12-312019-03-312019-01-01
Value17312511
Percentage of ContractWithCustomerLiabilityRevenueRecognized100.0100.0100.0100.0

us-gaap:DefinedBenefitPlanActuarialGainLoss

us-gaap:DefinedBenefitPlanActuarialGainLoss


Defined
Period End2021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-30
Value-0.10.2-0.1-0.10.20.00.0-0.2-0.4-0.4-0.3-0.8-0.5-1.0-0.8-0.8-1.2-1.2-1.3-0.8-0.8-0.8-1.7-2.3-2.4-1.92.2-2.1-1.71.4
Percentage of DefinedBenefitPlanActuarialGainLoss100.0100.0100.0100.0100.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DefinedBenefitPlanActuarialGainLoss us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents

us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:AccumulatedDefinedBenefitPlansAdjustment


Defined
Period End2021-03-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value-0.1-0.2-0.1-0.10.00.20.00.0-0.4-0.2-0.4-0.4-0.7-0.3-0.8-0.5-1.0-0.8-0.8-50.2-1.2-1.3-0.7-0.8-0.8-0.8-2.1-1.7-2.3-2.4
Percentage of DefinedBenefitPlanActuarialGainLoss100.0-100.0100.0100.00.0100.00.00.00.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.04183.3100.0100.00.0100.0100.0100.00.0100.0100.0100.0

us-gaap:DefinedBenefitPlanActuarialGainLoss us-gaap:RetirementPlanType

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Defined
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-09-30
Value0.4-0.90.60.40.4-2.00.70.60.5-0.40.70.60.5-0.80.90.40.70.3
Percentage of DefinedBenefitPlanActuarialGainLoss-400.00.0300.0-400.0-400.00.0350.00.00.00.0-350.0-150.0-125.00.0-300.0-50.0-140.0-30.0

us-gaap:PensionPlansDefinedBenefit


Defined
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-09-30
Value-0.5-20.7-0.4-0.5-0.5-29.2-0.5-0.6-0.523-0.9-1.0-0.9-8.2-1.2-1.2-1.2-1.3
Percentage of DefinedBenefitPlanActuarialGainLoss500.00.0-200.0500.0500.00.0-250.00.00.00.0450.0250.0225.00.0400.0150.0240.0130.0

us-gaap:DefinedBenefitPlanAmortizationOfPriorServiceCostCredit

us-gaap:DefinedBenefitPlanAmortizationOfPriorServiceCostCredit


Defined
Period End2021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-30
Value-100000.0-100000.0-100000.0-200000.0-100000.0-100000.0-200000.0-500000.0-600000.0-500000.0-400000.0-600000.0-500000.0-300000.0-300000.0-300000.0-300000.0-300000.0-300000.0-300000.0-300000.0-300000.0-300000.0-300000.0-400000.0-300000.0-400000.0-400000.0-300000.0-400000.0-400000.0-300000.0-300000.0
Percentage of DefinedBenefitPlanAmortizationOfPriorServiceCostCredit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DefinedBenefitPlanAmortizationOfPriorServiceCostCredit us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents

us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:AccumulatedDefinedBenefitPlansAdjustment


Defined
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value-100000.0-200000.0-100000.0-100000.0-200000.0-200000.0-100000.0-100000.0-200000.0-400000.0-500000.0-600000.0-500000.0-600000.0-400000.0-600000.0-500000.0-300000.0-300000.0-300000.0-300000.0-300000.0-300000.0-300000.0-300000.0-300000.0-300000.0-300000.0-300000.0-300000.0-400000.0
Percentage of DefinedBenefitPlanAmortizationOfPriorServiceCostCredit100.00.0100.0100.0100.00.0100.0100.0100.00.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.00.0100.0100.0100.0

us-gaap:DefinedBenefitPlanAmortizationOfPriorServiceCostCredit us-gaap:RetirementPlanType

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Defined
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-30
Value-100000.0-200000.0-200000.0-100000.0-200000.0-200000.0-200000.0-100000.0-200000.0-200000.0-200000.0-100000.0-200000.0-200000.0-100000.0-200000.0-200000.000
Percentage of DefinedBenefitPlanAmortizationOfPriorServiceCostCredit100.00.0200.0100.0100.00.0200.0100.0100.00.040.016.740.00.025.033.340.00.0-0.0

us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-30
Value0100000.0000100000.000-200000.0-300000.0-500000.0-300000.0-300000.0-300000.0-400000.0-300000.0-400000.0-300000.0
Percentage of DefinedBenefitPlanAmortizationOfPriorServiceCostCredit0.0-100.0-0.0-0.00.0-100.0-0.0-0.00.060.083.360.00.075.066.760.00.0100.0

us-gaap:DefinedBenefitPlanExpectedReturnOnPlanAssets

us-gaap:DefinedBenefitPlanExpectedReturnOnPlanAssets


Defined
Period End2021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-30
Value3.12.83.03.03.12.92.93.93.93.93.43.33.43.13.23.24.95.75.74.74.84.84.34.34.34.04.14.14.14.54.04.03.5
Percentage of DefinedBenefitPlanExpectedReturnOnPlanAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DefinedBenefitPlanExpectedReturnOnPlanAssets us-gaap:RetirementPlanType

us-gaap:PensionPlansDefinedBenefit


Defined
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-30
Value3.12.92.83.03.03.13.12.92.94.03.93.93.93.43.43.33.43.13.1
Percentage of DefinedBenefitPlanExpectedReturnOnPlanAssets100.00.0100.0100.0100.00.0100.0100.0100.00.0100.0100.0100.00.0100.0100.0100.00.0100.0

us-gaap:DefinedBenefitPlanInterestCost

us-gaap:DefinedBenefitPlanInterestCost


Defined
Period End2021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-30
Value1.51.71.92.02.02.52.52.42.42.42.42.52.62.82.72.73.54.04.04.34.44.33.64.03.94.04.04.24.44.64.34.14.0
Percentage of DefinedBenefitPlanInterestCost100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DefinedBenefitPlanInterestCost us-gaap:RetirementPlanType

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Defined
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-30
Value0.10.10.00.00.10.00.10.00.10.00.10.00.10.10.00.10.10.20.1
Percentage of DefinedBenefitPlanInterestCost6.70.00.00.05.00.05.00.04.00.04.20.04.20.00.04.03.80.03.6

us-gaap:PensionPlansDefinedBenefit


Defined
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-30
Value1.41.61.71.91.92.41.92.52.42.42.32.42.32.52.42.42.52.62.7
Percentage of DefinedBenefitPlanInterestCost93.30.0100.0100.095.00.095.0100.096.00.095.8100.095.80.0100.096.096.20.096.4

us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost

us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost


Defined
Period End2021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-30
Value-0.60.10.10.61.7-0.2-0.21.10.81.01.22.01.42.01.92.82.82.8512.12.12.52.72.63.14.54.54.04.44.43.93.84.13.84.0
Percentage of DefinedBenefitPlanNetPeriodicBenefitCost100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost us-gaap:RetirementPlanSponsorLocation

country:US


Defined
Period End2021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-30
Value-1.0-0.3-0.30.31.2-0.7-0.70.2
Percentage of DefinedBenefitPlanNetPeriodicBenefitCost166.7-300.0-300.050.070.6350.0350.025.0

us-gaap:ForeignPlan


Defined
Period End2021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-30
Value0.40.40.40.30.50.50.50.60.50.50.70.70.70.6
Percentage of DefinedBenefitPlanNetPeriodicBenefitCost-66.7400.0400.050.029.4-250.0-250.075.050.041.750.035.036.821.4

us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType

country:US, us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Defined
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value-0.4-0.6-0.8-0.5-0.5-0.7-0.8-0.7-0.6-0.8-0.8
Percentage of DefinedBenefitPlanNetPeriodicBenefitCost66.70.0-800.0-500.0-83.30.0-47.1350.0300.0-72.7-100.0

country:US, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value-0.6-0.30.50.20.80.52.00.0-0.11.31.0
Percentage of DefinedBenefitPlanNetPeriodicBenefitCost100.00.0500.0200.0133.30.0117.6-0.050.0118.2125.0

us-gaap:ForeignPlan, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-30
Value0.40.40.40.40.30.40.50.50.50.60.60.50.50.90.70.70.70.60.6
Percentage of DefinedBenefitPlanNetPeriodicBenefitCost-66.70.0400.0400.050.00.029.4-250.0-250.054.575.050.041.745.050.035.036.80.021.4

us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost us-gaap:RetirementPlanType

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Defined
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-30
Value-0.4-0.6-0.8-0.5-0.5-0.7-0.8-0.7-0.6-0.8-0.8-0.7-0.6-0.7-1.0-0.5-0.8-0.1-0.1
Percentage of DefinedBenefitPlanNetPeriodicBenefitCost66.70.0-800.0-500.0-83.30.0-47.1350.0300.0-72.7-100.0-70.0-50.0-35.0-71.4-25.0-42.10.0-3.6

us-gaap:PensionPlansDefinedBenefit


Defined
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-30
Value-0.20.10.90.61.10.92.50.50.41.91.61.71.82.72.42.52.70.82.9
Percentage of DefinedBenefitPlanNetPeriodicBenefitCost33.30.0900.0600.0183.30.0147.1-250.0-200.0172.7200.0170.0150.0135.0171.4125.0142.10.0103.6

us-gaap:DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1

us-gaap:DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1


Defined
Period End2021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302016-09-302015-09-30
Value-600000.0-1100000.0-900000.0-1400000.0-2700000.00000-49000000.0
Percentage of DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1100.0100.0100.0100.0100.00.00.00.00.0100.0

us-gaap:DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1 us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents

us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:AccumulatedDefinedBenefitPlansAdjustment


Defined
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value-600000.0-300000.0-1100000.0-900000.0-1400000.0-800000.0-2700000.000
Percentage of DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1100.00.0100.0100.0100.00.0100.00.00.0

us-gaap:DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1 us-gaap:RetirementPlanType

us-gaap:PensionPlansDefinedBenefit


Defined
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-09-30
Value-600000.0-300000.0-1100000.0-900000.0-1400000.06200000.0-2700000.0000
Percentage of DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1100.00.0100.0100.0100.00.0100.00.00.00.0

us-gaap:DefinedBenefitPlanServiceCost

us-gaap:DefinedBenefitPlanServiceCost


Defined
Period End2021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-30
Value0.40.40.30.30.40.30.42.72.62.72.82.62.52.62.72.42.82.82.62.92.82.42.62.62.42.82.92.42.72.62.42.72.72.52.5
Percentage of DefinedBenefitPlanServiceCost100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DefinedBenefitPlanServiceCost us-gaap:RetirementPlanType

us-gaap:PensionPlansDefinedBenefit


Defined
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-30
Value0.40.50.40.30.30.30.40.30.42.72.62.72.82.62.52.62.72.62.3
Percentage of DefinedBenefitPlanServiceCost100.00.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.095.8

us-gaap:Depreciation

us-gaap:Depreciation


Depreciation
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value282727252425242524252524252424222222222221212121202122202120191919181717171718181817
Percentage of Depreciation100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DerivativeExcludedComponentGainLossRecognizedInEarnings us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship

us-gaap:DerivativeExcludedComponentGainLossRecognizedInEarnings

us-gaap:FairValueHedging


Derivative
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value600000.01300000.01300000.01700000.02000000.02300000.02200000.04500000.01900000.0
Percentage of DerivativeExcludedComponentGainLossRecognizedInEarnings100.0100.0100.0100.0100.0100.0100.0100.0100.0

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

us-gaap:DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet

us-gaap:CommodityOption, us-gaap:Nondesignated, us-gaap:CostOfSales


Derivative
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value500000.0-100000.0100000.00200000.0100000.0100000.0200000.0
Percentage of DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet100.0100.0100.00.0100.0100.0100.0100.0

us-gaap:DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet us-gaap:HedgingDesignation

us-gaap:Nondesignated


Derivative
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value500000.0-100000.0100000.00200000.0100000.0100000.0200000.0
Percentage of DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet100.0100.0100.00.0100.0100.0100.0100.0

us-gaap:DividendsCommonStockCash

us-gaap:DividendsCommonStockCash


Dividends
Period End2021-03-312020-09-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-12-312012-09-302012-06-302012-03-31
Value121111111110110.5201010109.69.69.49.58.68.07.97.97.87.17.16.6130.06.16.1
Percentage of DividendsCommonStockCash100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0

us-gaap:DividendsCommonStockCash us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings


Dividends
Period End2021-03-312020-09-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-12-312012-09-302012-06-302012-03-31
Value1211-11.8-11.9-11.4-10.6110.5201010109.69.69.49.58.68.07.97.97.87.17.16.6130.06.16.1
Percentage of DividendsCommonStockCash100.0100.0-100.0-100.0-100.0-100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0

us-gaap:EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents

us-gaap:EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents


Effect
Period End2021-03-312020-03-31
Value-9600000.0-8700000.0
Percentage of EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents100.0100.0

us-gaap:EffectOnFutureEarningsAmount us-gaap:Range, us-gaap:RestructuringPlan

us-gaap:EffectOnFutureEarningsAmount

srt:Maximum, wst:The2020RestructuringPlan


Effect
Period End2020-07-31
Value4.5
Percentage of EffectOnFutureEarningsAmount100.0

srt:Minimum, wst:The2020RestructuringPlan


Effect
Period End2020-07-31
Value3.5
Percentage of EffectOnFutureEarningsAmount77.8

us-gaap:EffectiveIncomeTaxRateReconciliationShareBasedCompensationExcessTaxBenefitAmount

us-gaap:EffectiveIncomeTaxRateReconciliationShareBasedCompensationExcessTaxBenefitAmount


Effective
Period End2021-03-312020-03-31
Value-11100000.0-5100000.0
Percentage of EffectiveIncomeTaxRateReconciliationShareBasedCompensationExcessTaxBenefitAmount100.0100.0

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings


Fair
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value-700000.0-300000.0-800000.0-100000.001700000.0200000.0-3400000.0200000.0300000.0300000.0-2900000.0-200000.0400000.0300000.0400000.001700000.0200000.0500000.0500000.0-200000.02000000.0-300000.0-300000.0-400000.01500000.0-300000.0-200000.00
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements


Fair
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-09-302014-12-312014-09-30
Value400000.0200000.0400000.0200000.0100000.0200000.0200000.0100000.00300000.0200000.0200000.0300000.0100000.0100000.0200000.0100000.0000100000.0100000.0
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.00.00.00.0100.0100.0

us-gaap:ForeignCurrencyTransactionGainLossBeforeTax

us-gaap:ForeignCurrencyTransactionGainLossBeforeTax


Foreign
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-03-31
Value300000.0-3000000.0-1000000.0-2000000.0-3500000.01100000.05100000.0-4800000.0-3800000.0-2700000.0400000.0
Percentage of ForeignCurrencyTransactionGainLossBeforeTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:GainLossFromComponentsExcludedFromAssessmentOfFairValueHedgeEffectivenessNet us-gaap:IncomeStatementLocation

us-gaap:GainLossFromComponentsExcludedFromAssessmentOfFairValueHedgeEffectivenessNet

us-gaap:ForeignCurrencyGainLoss


Gain
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value600000.0200000.01900000.02000000.02000000.01900000.0-4300000.04500000.0
Percentage of GainLossFromComponentsExcludedFromAssessmentOfFairValueHedgeEffectivenessNet100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:GainLossOnDerivativeInstrumentsNetPretax us-gaap:IncomeStatementLocation

us-gaap:GainLossOnDerivativeInstrumentsNetPretax

us-gaap:CostOfSales


Gain
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value0100000.0-200000.00-100000.0-200000.0-200000.0-100000.0
Percentage of GainLossOnDerivativeInstrumentsNetPretax0.0100.0100.00.0100.0100.0100.0100.0

us-gaap:ForeignCurrencyGainLoss


Gain
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value400000.0-1000000.0-700000.0-1300000.0-1300000.0-1300000.02900000.0-3000000.0-3200000.0
Percentage of GainLossOnDerivativeInstrumentsNetPretax0.00.0-700.0650.00.01300.0-1450.01500.03200.0

wst:NetSales


Gain
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value300000.0500000.0200000.0-300000.0-200000.0-200000.0-300000.0-200000.0-200000.0
Percentage of GainLossOnDerivativeInstrumentsNetPretax0.00.0200.0150.00.0200.0150.0100.0200.0

us-gaap:GainLossOnFairValueHedgesRecognizedInEarnings

us-gaap:GainLossOnFairValueHedgesRecognizedInEarnings


Gain
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value600000.0200000.01900000.02000000.02000000.01900000.0-4300000.04500000.0
Percentage of GainLossOnFairValueHedgesRecognizedInEarnings100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncomeLossFromEquityMethodInvestments

us-gaap:IncomeLossFromEquityMethodInvestments


Income
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value5.03.75.75.22.83.02.32.01.61.12.12.02.42.52.11.03.62.02.72.21.21.60.91.31.51.41.21.20.81.71.71.20.01.42.11.21.41.51.91.40.81.11.6
Percentage of IncomeLossFromEquityMethodInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncrementalCommonSharesAttributableToShareBasedPaymentArrangements

us-gaap:IncrementalCommonSharesAttributableToShareBasedPaymentArrangements


Incremental
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value1900000.0200000.01900000.01700000.01600000.001500000.01400000.01200000.001800000.01400000.01600000.0-100000.01700000.01900000.01600000.001700000.01500000.01600000.01700000.01700000.01600000.0200000.01600000.01600000.01700000.0300000.01600000.01300000.0600000.0100000.0500000.0500000.0300000.0-100000.0300000.0500000.0500000.00400000.0500000.0
Percentage of IncrementalCommonSharesAttributableToShareBasedPaymentArrangements100.0100.0100.0100.0100.00.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0

us-gaap:InvestmentIncomeNet

us-gaap:InvestmentIncomeNet


Investment
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value100000.0200000.0200000.0200000.0800000.01300000.01000000.0600000.0900000.0700000.0500000.0300000.0600000.0400000.0300000.0300000.0300000.0300000.0200000.0300000.0300000.0500000.0400000.0400000.0800000.01800000.0500000.0400000.0500000.0400000.0400000.0600000.0300000.0500000.0600000.0400000.0400000.0400000.0300000.0200000.0300000.0100000.0100000.0
Percentage of InvestmentIncomeNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LeaseCost

us-gaap:LeaseCost


Lease
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-03-31
Value4.14.74.64.04.14.54.34.24.04.13.33.7
Percentage of LeaseCost100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OciBeforeReclassificationsNetOfTaxAttributableToParent

us-gaap:OciBeforeReclassificationsNetOfTaxAttributableToParent


Oci
Period End2021-03-312020-12-312020-09-30
Value-30.94928
Percentage of OciBeforeReclassificationsNetOfTaxAttributableToParent100.0100.0100.0

us-gaap:OciBeforeReclassificationsNetOfTaxAttributableToParent us-gaap:StatementEquityComponents

us-gaap:AccumulatedDefinedBenefitPlansAdjustment


Oci
Period End2021-03-312020-12-312020-09-30
Value0.13.7-0.8
Percentage of OciBeforeReclassificationsNetOfTaxAttributableToParent-0.37.5-2.9

us-gaap:AccumulatedGainLossNetCashFlowHedgeParent


Oci
Period End2021-03-312020-09-30
Value-2.6-0.6
Percentage of OciBeforeReclassificationsNetOfTaxAttributableToParent8.4-2.1

us-gaap:AccumulatedTranslationAdjustment


Oci
Period End2021-03-312020-12-312020-09-30
Value-28.44529
Percentage of OciBeforeReclassificationsNetOfTaxAttributableToParent91.991.5105.0

us-gaap:OperatingLeaseCost

us-gaap:OperatingLeaseCost


Operating
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value3.13.53.13.13.13.23.43.13.2
Percentage of OperatingLeaseCost100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingLeasePayments

us-gaap:OperatingLeasePayments


Operating
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value3.23.03.23.23.23.13.23.13.1
Percentage of OperatingLeasePayments100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherAssetImpairmentCharges

us-gaap:OtherAssetImpairmentCharges


Other
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302012-12-312012-09-302012-06-302011-12-312011-09-302011-06-30
Value100000.0500000.0900000.06300000.0200000.0-1500000.0800000.01200000.0003400000.0000
Percentage of OtherAssetImpairmentCharges100.0100.0100.0100.0100.0100.0100.0100.00.00.0100.00.00.00.0

us-gaap:OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent

us-gaap:OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent


Other
Period End2021-03-312020-09-302020-06-302020-03-312019-09-302019-06-30
Value-600000.0200000.05800000.0-2000000.0-2400000.0-100000.0
Percentage of OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeDefinedBenefitPlansTaxPortionAttributableToParent

us-gaap:OtherComprehensiveIncomeDefinedBenefitPlansTaxPortionAttributableToParent


Other
Period End2021-03-312020-09-302020-06-302020-03-312019-09-302019-06-30
Value-200000.0-100000.0-1700000.0-600000.0-700000.00
Percentage of OtherComprehensiveIncomeDefinedBenefitPlansTaxPortionAttributableToParent100.0100.0100.0100.0100.00.0

us-gaap:OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent

us-gaap:OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent


Other
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value-28.4452913-47.325-23.8-0.7
Percentage of OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent


Other
Period End2021-03-312020-12-312020-09-302020-03-312019-12-312019-09-30
Value-1800000.0-100000.0-900000.02600000.0-2100000.03200000.0
Percentage of OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationTaxParent

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationTaxParent


Other
Period End2021-03-312020-12-312020-09-302020-03-312019-12-312019-09-30
Value-700000.0-1000000.0200000.01300000.0-900000.01500000.0
Percentage of OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationTaxParent100.0100.0100.0100.0100.0100.0

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

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax

us-gaap:ForeignExchangeContract, us-gaap:CashFlowHedging, us-gaap:CostOfSales


Other
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value-1900000.0-300000.00-700000.0400000.0-1300000.0600000.0600000.0
Percentage of OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax100.0100.00.0100.0100.0100.0100.0100.0

us-gaap:ForeignExchangeContract, us-gaap:CashFlowHedging, wst:NetSales


Other
Period End2021-03-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value-100000.0-500000.0400000.0100000.0-200000.0700000.0-200000.0
Percentage of OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax5.30.0-57.125.015.4116.7-33.3

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship

us-gaap:CashFlowHedging


Other
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value-2000000.0-900000.0-500000.0-300000.0500000.0-1500000.01300000.0400000.0
Percentage of OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax105.3300.00.042.9125.0115.4216.766.7

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

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeReclassificationForDiscontinuanceBeforeTax

us-gaap:ForeignExchangeContract, us-gaap:CashFlowHedging, us-gaap:CostOfSales


Other
Period End2020-12-312020-09-302020-06-302019-12-312019-09-302019-06-30
Value0-100000.0200000.0100000.0200000.0200000.0
Percentage of OtherComprehensiveIncomeLossCashFlowHedgeReclassificationForDiscontinuanceBeforeTax0.0100.0100.0100.0100.0100.0

us-gaap:ForeignExchangeContract, us-gaap:CashFlowHedging, wst:NetSales


Other
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value-300000.0-500000.0-200000.0300000.0200000.0200000.0300000.0200000.0
Percentage of OtherComprehensiveIncomeLossCashFlowHedgeReclassificationForDiscontinuanceBeforeTax0.00.0200.0150.00.0200.0150.0100.0

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeReclassificationForDiscontinuanceBeforeTax us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship

us-gaap:CashFlowHedging


Other
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value-400000.0-600000.0-400000.0400000.0200000.0200000.0400000.0300000.0
Percentage of OtherComprehensiveIncomeLossCashFlowHedgeReclassificationForDiscontinuanceBeforeTax0.00.0400.0200.00.0200.0200.0150.0

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

us-gaap:OtherComprehensiveIncomeLossNetInvestmentHedgeGainLossBeforeReclassificationAndTax

us-gaap:CurrencySwap, us-gaap:NetInvestmentHedging, us-gaap:ForeignCurrencyGainLoss


Other
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-06-30
Value5000000.0-1200000.0-3000000.0600000.0-1200000.00
Percentage of OtherComprehensiveIncomeLossNetInvestmentHedgeGainLossBeforeReclassificationAndTax100.0100.0100.0100.0100.00.0

us-gaap:ForeignExchangeContract, us-gaap:FairValueHedging, us-gaap:ForeignCurrencyGainLoss


Other
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value-600000.01200000.0-100000.0-700000.03600000.0900000.0-600000.04700000.0
Percentage of OtherComprehensiveIncomeLossNetInvestmentHedgeGainLossBeforeReclassificationAndTax-12.0-100.03.3-116.7-300.00.00.00.0

us-gaap:OtherComprehensiveIncomeLossNetInvestmentHedgeGainLossBeforeReclassificationAndTax us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship

us-gaap:FairValueHedging


Other
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value-600000.01200000.0-100000.0-700000.03600000.0900000.0-600000.04700000.0
Percentage of OtherComprehensiveIncomeLossNetInvestmentHedgeGainLossBeforeReclassificationAndTax-12.0-100.03.3-116.7-300.00.00.00.0

us-gaap:NetInvestmentHedging


Other
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value5000000.0-1200000.0-3000000.0600000.0-1200000.0-1000000.0700000.0-300000.0
Percentage of OtherComprehensiveIncomeLossNetInvestmentHedgeGainLossBeforeReclassificationAndTax100.0100.0100.0100.0100.00.00.00.0

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

us-gaap:OtherComprehensiveIncomeLossNetInvestmentHedgeGainLossReclassificationBeforeTax

us-gaap:ForeignExchangeContract, us-gaap:FairValueHedging, us-gaap:ForeignCurrencyGainLoss


Other
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value-400000.01000000.0700000.01300000.01300000.01300000.0-2900000.03000000.0
Percentage of OtherComprehensiveIncomeLossNetInvestmentHedgeGainLossReclassificationBeforeTax100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossNetInvestmentHedgeGainLossReclassificationBeforeTax us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship

us-gaap:FairValueHedging


Other
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value-400000.01000000.0700000.01300000.01300000.01300000.0-2900000.03000000.0
Percentage of OtherComprehensiveIncomeLossNetInvestmentHedgeGainLossReclassificationBeforeTax100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent

us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent


Other
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value-29.648284.5-42.720-18.21.20.8
Percentage of OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent us-gaap:StatementEquityComponents

us-gaap:AccumulatedDefinedBenefitPlansAdjustment


Other
Period End2021-03-312020-12-312020-09-30
Value0.63.8-0.2
Percentage of OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent-2.07.8-0.7

us-gaap:AccumulatedGainLossNetCashFlowHedgeParent


Other
Period End2021-03-312020-09-30
Value-1.8-0.9
Percentage of OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent6.1-3.2

us-gaap:AccumulatedOtherComprehensiveIncome


Other
Period End2021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-31
Value-29.6284.5-42.7-18.21.20.8
Percentage of OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent100.0100.0100.0100.0100.0100.0100.0

us-gaap:AccumulatedTranslationAdjustment


Other
Period End2021-03-312020-12-312020-09-30
Value-28.44529
Percentage of OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent95.992.0103.9

us-gaap:OtherNoncashIncomeExpense

us-gaap:OtherNoncashIncomeExpense


Other
Period End2021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-30
Value2.8-17.8-18.345-16.5-6.038-1.94.9255.2-6.8637.0-63.3601.10.61.01.20.71.21.37.0-4.3-12.32.62.11.2-5.52.1-0.4
Percentage of OtherNoncashIncomeExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherOperatingIncomeExpenseNet

us-gaap:OtherOperatingIncomeExpenseNet


Other
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value-2200000.0-2200000.0300000.01200000.0-200000.01900000.0-3700000.0200000.02900000.0800000.02500000.01200000.0300000.0-2100000.0-200000.0-600000.0-1000000.02100000.0-600000.0-1000000.0-400000.0500000.0400000.0600000.01200000.0900000.0-500000.0-700000.0-300000.0-200000.0500000.0-500000.0
Percentage of OtherOperatingIncomeExpenseNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PaymentForContingentConsiderationLiabilityOperatingActivities

us-gaap:PaymentForContingentConsiderationLiabilityOperatingActivities


Payment
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value400000.0200000.0400000.0200000.0100000.0200000.00100000.0200000.0100000.00300000.0200000.00000
Percentage of PaymentForContingentConsiderationLiabilityOperatingActivities100.0100.0100.0100.0100.0100.00.0100.0100.0100.00.0100.0100.00.00.00.00.0

us-gaap:PaymentsForProceedsFromOtherInvestingActivities

us-gaap:PaymentsForProceedsFromOtherInvestingActivities


Payments
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value-200000.03700000.01600000.00-200000.0-2100000.0-100000.0-100000.0-100000.0-1400000.00-3200000.0700000.0-100000.0-300000.00-2800000.0-800000.0-800000.0-800000.0-400000.0-200000.0-1200000.0200000.0-1000000.0600000.0100000.0-300000.0-3900000.0-100000.03500000.0-500000.0-900000.0-300000.0-100000.0-300000.0-1300000.00-300000.0-300000.0-900000.0-800000.0
Percentage of PaymentsForProceedsFromOtherInvestingActivities100.0100.0100.00.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0

us-gaap:PaymentsForRestructuring us-gaap:RestructuringCostAndReserve, us-gaap:RestructuringPlan

us-gaap:PaymentsForRestructuring

us-gaap:EmployeeSeverance, wst:A2020RestructuringPlan


Payments
Period End2021-03-31
Value100000.0
Percentage of PaymentsForRestructuring100.0

us-gaap:PaymentsForRestructuring us-gaap:RestructuringPlan

wst:A2018RestructuringPlan


Payments
Period End2021-03-312020-09-302020-06-302020-03-312019-12-312019-03-312018-12-312018-09-30
Value100000.0200000.0400000.0600000.01500000.01100000.0600000.0100000.0
Percentage of PaymentsForRestructuring100.00.00.00.00.00.00.00.0

wst:A2020RestructuringPlan


Payments
Period End2021-03-31
Value100000.0
Percentage of PaymentsForRestructuring100.0

us-gaap:PaymentsRelatedToTaxWithholdingForShareBasedCompensation

us-gaap:PaymentsRelatedToTaxWithholdingForShareBasedCompensation


Payments
Period End2021-03-312020-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-03-31
Value131.20.00.00.73.70.00.00.03.80.00.00.03.70.0-0.15.70.00.00.04.10.00.02.32.90.6
Percentage of PaymentsRelatedToTaxWithholdingForShareBasedCompensation100.0100.00.00.0100.0100.00.00.00.0100.00.00.00.0100.00.0100.0100.00.00.00.0100.00.00.0100.0100.0100.0

us-gaap:PaymentsToAcquireIntangibleAssets

us-gaap:PaymentsToAcquireIntangibleAssets


Payments
Period End2020-12-312020-09-302020-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value2500000.001600000.0700000.0300000.0300000.0100000.001400000.0-400000.00400000.0
Percentage of PaymentsToAcquireIntangibleAssets100.00.0100.0100.0100.0100.0100.00.0100.0100.00.0100.0

us-gaap:ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlans

us-gaap:ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlans


Proceeds
Period End2021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-03-31
Value1800000.01700000.01600000.01300000.01400000.01400000.01200000.01200000.01300000.01100000.01000000.01200000.01000000.01100000.0900000.0800000.0800000.0800000.0700000.0700000.0700000.0800000.0800000.0500000.0600000.0600000.0
Percentage of ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlans100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProceedsFromStockOptionsExercised

us-gaap:ProceedsFromStockOptionsExercised


Proceeds
Period End2021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-03-31
Value5.83.69.86.39.3123.3196.94.06.511182.17.1121.51.66.65.32.82.44.45.25.50.8
Percentage of ProceedsFromStockOptionsExercised100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent

us-gaap:ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent


Reclassification
Period End2021-03-312020-12-312020-09-30
Value-1300000.0300000.0-300000.0
Percentage of ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent100.0100.0100.0

us-gaap:ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent us-gaap:StatementEquityComponents

us-gaap:AccumulatedDefinedBenefitPlansAdjustment


Reclassification
Period End2021-03-312020-12-312020-09-30
Value-500000.0-100000.0-600000.0
Percentage of ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent38.5-33.3200.0

us-gaap:AccumulatedGainLossNetCashFlowHedgeParent


Reclassification
Period End2021-03-312020-09-30
Value-800000.0300000.0
Percentage of ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent61.5-100.0

us-gaap:RepaymentsOfOtherLongTermDebt

us-gaap:RepaymentsOfOtherLongTermDebt


Repayments
Period End2021-03-312020-09-302020-06-302020-03-31
Value600000.0600000.0500000.0600000.0
Percentage of RepaymentsOfOtherLongTermDebt100.0100.0100.0100.0

us-gaap:RestructuringAndRelatedCostIncurredCost

us-gaap:RestructuringAndRelatedCostIncurredCost


Restructuring
Period End2021-03-312020-12-312020-09-302019-12-312019-09-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value1.20.14.51.11.80.62.41.22.23.30.00.00.00.02.72.3-1.522
Percentage of RestructuringAndRelatedCostIncurredCost100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.00.00.0100.0100.0100.0100.0

us-gaap:RestructuringCharges us-gaap:ConsolidationItems

us-gaap:RestructuringCharges

us-gaap:CorporateNonSegment


Restructuring
Period End2021-03-31
Value-1.2
Percentage of RestructuringCharges100.0

us-gaap:MaterialReconcilingItems


Restructuring
Period End2020-09-302019-09-30
Value4.51.8
Percentage of RestructuringCharges0.00.0

us-gaap:RestructuringCharges us-gaap:RestructuringCostAndReserve, us-gaap:RestructuringPlan

us-gaap:EmployeeSeverance, wst:A2020RestructuringPlan


Restructuring
Period End2021-03-31
Value0.6
Percentage of RestructuringCharges-50.0

us-gaap:OtherRestructuring, wst:A2020RestructuringPlan


Restructuring
Period End2021-03-31
Value0.6
Percentage of RestructuringCharges-50.0

us-gaap:RestructuringCharges us-gaap:RestructuringPlan

wst:A2020RestructuringPlan


Restructuring
Period End2021-03-31
Value1.2
Percentage of RestructuringCharges-100.0

us-gaap:RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability

us-gaap:RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability


Right
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value500000.01500000.0300000.01800000.02500000.0700000.0300000.01300000.06800000.0
Percentage of RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:SeveranceCosts1

us-gaap:SeveranceCosts1


Severance
Period End2020-12-312020-09-302019-12-312019-09-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value100000.04500000.0400000.0600000.0300000.0-300000.0100000.01300000.02000000.000001100000.01400000.0-1500000.07900000.0
Percentage of SeveranceCosts1100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.00.00.0100.0100.0100.0100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue us-gaap:AwardType

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue

us-gaap:PerformanceShares


Share
Period End2020-09-302020-06-302020-03-312019-03-312018-12-312018-09-302015-09-30
Value1.540.42173.22102.510.350.20.01
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue100.0100.0100.0100.0100.0100.0100.0

us-gaap:RestrictedStockUnitsRSU


Share
Period End2021-03-312020-09-302020-06-302020-03-312019-03-312018-09-30
Value274.2916.774.22173.22102.510
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue0.01089.01004.8100.0100.00.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate


Share
Period End2021-03-31
Value0.3
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate


Share
Period End2021-03-31
Value23.9
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate


Share
Period End2021-03-31
Value0.7
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue


Share
Period End2021-03-312020-12-31
Value63.00.7
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue100.0100.0

us-gaap:ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice

us-gaap:ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice


Share
Period End2021-03-312020-12-31
Value274.292.89
Percentage of ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice100.0100.0

us-gaap:ShortTermLeaseCost

us-gaap:ShortTermLeaseCost


Short
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value200000.0200000.0300000.0100000.0200000.0300000.0100000.0200000.0200000.0
Percentage of ShortTermLeaseCost100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StockIssuedDuringPeriodSharesShareBasedCompensation us-gaap:StatementEquityComponents

us-gaap:StockIssuedDuringPeriodSharesShareBasedCompensation

us-gaap:TreasuryStock


Stock
Period End2021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value-300000.0-100000.0-200000.0-300000.0-300000.0-200000.0-200000.00-600000.0-200000.0-100000.0
Percentage of StockIssuedDuringPeriodSharesShareBasedCompensation100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0

us-gaap:StockIssuedDuringPeriodValueShareBasedCompensation

us-gaap:StockIssuedDuringPeriodValueShareBasedCompensation


Stock
Period End2021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-30
Value2.51320121619103.125126.55.38.012205.33.12.42.49.05.06.33.16.77.65.02.32.81.81.81.1
Percentage of StockIssuedDuringPeriodValueShareBasedCompensation100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StockIssuedDuringPeriodValueShareBasedCompensation us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital


Stock
Period End2021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302015-09-30
Value-20.65.1-4.5-5.1-4.9-5.1-3.5-2.0-21.9-3.83.84.15.911164.12.22.5
Percentage of StockIssuedDuringPeriodValueShareBasedCompensation-824.036.7-22.1-39.8-30.1-25.9-32.7-64.5-86.6-31.158.577.473.891.183.577.471.0104.2

us-gaap:TreasuryStock


Stock
Period End2021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302014-03-312013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-30
Value238.824172124145.147162.71.12.11.03.11.20.9-0.4-0.79.23.06.95.33.61.2
Percentage of StockIssuedDuringPeriodValueShareBasedCompensation924.063.3122.1139.8130.1125.9132.7164.5186.6131.141.520.826.28.115.522.629.0-6.0-9.2184.0130.4246.4294.4200.0109.1

us-gaap:TreasuryStockAcquiredAverageCostPerShare

us-gaap:TreasuryStockAcquiredAverageCostPerShare


Treasury
Period End2021-03-312018-06-302017-09-302017-06-302016-09-302016-06-30
Value286.2388.030081.4673.2
Percentage of TreasuryStockAcquiredAverageCostPerShare100.0100.00.00.0100.0100.0

us-gaap:TreasuryStockSharesAcquired us-gaap:StatementEquityComponents

us-gaap:TreasuryStockSharesAcquired

us-gaap:TreasuryStock


Treasury
Period End2021-03-312020-03-312019-03-312018-12-312018-09-302018-06-302018-03-31
Value500000.0800000.0800000.000300000.0500000.0
Percentage of TreasuryStockSharesAcquired100.0100.0100.00.00.0100.0100.0

us-gaap:TreasuryStockValueAcquiredCostMethod

us-gaap:TreasuryStockValueAcquiredCostMethod


Treasury
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302012-12-312012-09-302012-06-302012-03-312011-12-312011-09-30
Value1370.00.00.01150.0830.00.02247470.00.026259.68.16.9-4.41.60.67.00.0
Percentage of TreasuryStockValueAcquiredCostMethod100.00.00.00.0100.00.0100.00.00.0100.0100.0100.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0

us-gaap:TreasuryStockValueAcquiredCostMethod us-gaap:StatementEquityComponents

us-gaap:TreasuryStock


Treasury
Period End2021-03-312020-03-312019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302012-12-312012-09-302012-06-302012-03-312011-12-312011-09-30
Value137115830.00.02247470.00.026259.66.6-4.41.60.67.00.0
Percentage of TreasuryStockValueAcquiredCostMethod100.0100.0100.00.00.0100.0100.0100.00.00.0100.0100.0100.095.7100.0100.0100.0100.00.0

us-gaap:VariableLeaseCost

us-gaap:VariableLeaseCost


Variable
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value800000.01000000.01200000.0800000.0800000.01000000.0800000.0900000.0600000.0
Percentage of VariableLeaseCost100.0100.0100.0100.0100.0100.0100.0100.0100.0

wst:ContractWithCustomerAssetIncreaseDecrease

wst:ContractWithCustomerAssetIncreaseDecrease


Contract
Period End2021-03-312020-12-31
Value1600000.0-5300000.0
Percentage of ContractWithCustomerAssetIncreaseDecrease100.0100.0

wst:CostInvestmentImpairment

wst:CostInvestmentImpairment


Cost
Period End2021-03-31
Value2200000.0
Percentage of CostInvestmentImpairment100.0

wst:CostInvestmentImpairment us-gaap:ConsolidationItems

us-gaap:CorporateNonSegment


Cost
Period End2021-03-31
Value-2200000.0
Percentage of CostInvestmentImpairment-100.0

wst:DevelopmentAndLicensingIncome

wst:DevelopmentAndLicensingIncome


Development
Period End2020-12-312020-09-302020-06-302019-12-312019-09-302019-06-30
Value300000.0200000.0200000.0300000.0200000.0200000.0
Percentage of DevelopmentAndLicensingIncome100.0100.0100.0100.0100.0100.0

wst:DevelopmentAndLicensingIncome us-gaap:NatureOfExpense

wst:SmartDose


Development
Period End2020-12-312020-09-302020-06-302019-12-312019-09-302019-06-30
Value300000.0200000.0200000.0300000.0200000.0200000.0
Percentage of DevelopmentAndLicensingIncome100.0100.0100.0100.0100.0100.0

wst:IncomeTaxBenefitFromStockBasedCompensation

wst:IncomeTaxBenefitFromStockBasedCompensation


Income
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value6800000.02000000.06900000.05100000.01100000.04000000.03800000.01400000.0
Percentage of IncomeTaxBenefitFromStockBasedCompensation100.0100.0100.0100.0100.0100.0100.0100.0

wst:IncomeTaxBenefitFromStockBasedCompensationImpactOnDilutedEarningsPerShare

wst:IncomeTaxBenefitFromStockBasedCompensationImpactOnDilutedEarningsPerShare


Income
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value0.090.020.090.070.020.050.050.02
Percentage of IncomeTaxBenefitFromStockBasedCompensationImpactOnDilutedEarningsPerShare100.0100.0100.0100.0100.0100.0100.0100.0

wst:OtherIncomeExpense

wst:OtherIncomeExpense


Other
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value-3900000.0-5800000.0-6700000.0-3000000.03500000.04100000.0-6400000.02500000.02300000.02100000.0200000.0-1100000.0-3100000.01100000.09500000.0-11700000.0-900000.0-700000.0-2500000.0-800000.0-25800000.0-48700000.0-10200000.0800000.01500000.0-300000.0-300000.0-700000.0-1000000.0-100000.0800000.0-500000.0-500000.0-1000000.0-400000.0800000.0-2300000.0600000.0400000.0200000.0-3400000.0200000.0800000.0
Percentage of OtherIncomeExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

wst:PaymentsToAcquireIntangibleAssetsImpactOnDilutedEarningsPerShare

wst:PaymentsToAcquireIntangibleAssetsImpactOnDilutedEarningsPerShare


Payments
Period End2020-12-312020-06-30
Value0.030.02
Percentage of PaymentsToAcquireIntangibleAssetsImpactOnDilutedEarningsPerShare100.0100.0

wst:PensionSettlementAndRelatedCharges

wst:PensionSettlementAndRelatedCharges


Pension
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value300000.0800000.0700000.01100000.0600000.02100000.01100000.0400000.0
Percentage of PensionSettlementAndRelatedCharges100.0100.0100.0100.0100.0100.0100.0100.0

wst:PensionSettlementAndRelatedChargesImpactOnDilutedEarningsPerShare

wst:PensionSettlementAndRelatedChargesImpactOnDilutedEarningsPerShare


Pension
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value0.010.010.010.010.010.030.010.01
Percentage of PensionSettlementAndRelatedChargesImpactOnDilutedEarningsPerShare100.0100.0100.0100.0100.0100.0100.0100.0

wst:PensionSettlementCharge

wst:PensionSettlementCharge


Pension
Period End2021-03-312020-09-302020-06-302020-03-312019-09-30
Value600000.01100000.0900000.01400000.02700000.0
Percentage of PensionSettlementCharge100.0100.0100.0100.0100.0

wst:PurchasesAndRoyaltyPaymentsFromEquityMethodInvestees

wst:PurchasesAndRoyaltyPaymentsFromEquityMethodInvestees


Purchases
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-03-31
Value384636273229332724221623
Percentage of PurchasesAndRoyaltyPaymentsFromEquityMethodInvestees100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

wst:RestructuringAndSeveranceRelatedCharges

wst:RestructuringAndSeveranceRelatedCharges


Restructuring
Period End2020-09-302019-12-312019-09-30
Value3400000.0800000.01400000.0
Percentage of RestructuringAndSeveranceRelatedCharges100.0100.0100.0

wst:RestructuringAndSeveranceRelatedChargesImpactOnDilutedEarningsPerShare

wst:RestructuringAndSeveranceRelatedChargesImpactOnDilutedEarningsPerShare


Restructuring
Period End2020-09-302019-12-312019-09-30
Value0.040.020.01
Percentage of RestructuringAndSeveranceRelatedChargesImpactOnDilutedEarningsPerShare100.0100.0100.0

wst:SalesToEquityMethodInvestees

wst:SalesToEquityMethodInvestees


Sales
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-03-31
Value2900000.02000000.02700000.02800000.02200000.02300000.02200000.02500000.02200000.01600000.03000000.02400000.0
Percentage of SalesToEquityMethodInvestees100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:EntityCommonStockSharesOutstanding

dei:EntityCommonStockSharesOutstanding


Entity
Period End2020-10-192020-04-172020-01-31
Value737373
Percentage of EntityCommonStockSharesOutstanding100.0100.0100.0

us-gaap:AccrualForTaxesOtherThanIncomeTaxesCurrent

us-gaap:AccrualForTaxesOtherThanIncomeTaxesCurrent


Accrual
Period End2020-12-312019-12-312018-12-31
Value156.55.5
Percentage of AccrualForTaxesOtherThanIncomeTaxesCurrent100.0100.0100.0

us-gaap:AccruedProfessionalFeesCurrent

us-gaap:AccruedProfessionalFeesCurrent


Accrued
Period End2020-12-312019-12-312018-12-31
Value3700000.05900000.04900000.0
Percentage of AccruedProfessionalFeesCurrent100.0100.0100.0

us-gaap:AccruedSalesCommissionCurrentAndNoncurrent

us-gaap:AccruedSalesCommissionCurrentAndNoncurrent


Accrued
Period End2020-12-312019-12-312018-12-31
Value10000000.09700000.05700000.0
Percentage of AccruedSalesCommissionCurrentAndNoncurrent100.0100.0100.0

us-gaap:AllowanceForDoubtfulAccountsReceivableCurrent

us-gaap:AllowanceForDoubtfulAccountsReceivableCurrent


Allowance
Period End2020-12-312019-12-312018-12-312017-12-312014-12-312013-12-312012-12-312011-12-31
Value1100000.0500000.02000000.0500000.0900000.0800000.0500000.0300000.0
Percentage of AllowanceForDoubtfulAccountsReceivableCurrent100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AssetsFairValueDisclosure

us-gaap:AssetsFairValueDisclosure


Assets
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-03-312018-12-312018-09-302017-12-31
Value201612111019232715129.4
Percentage of AssetsFairValueDisclosure100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AssetsFairValueDisclosure us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:FairValueInputsLevel1


Assets
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-03-312018-12-312018-09-302017-12-31
Value131211119.3119.99.28.79.48.9
Percentage of AssetsFairValueDisclosure63.979.590.398.287.759.242.733.957.277.094.7

us-gaap:FairValueInputsLevel2


Assets
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-03-312018-12-312018-09-302017-12-31
Value7.53.31.20.21.37.813176.52.80.5
Percentage of AssetsFairValueDisclosure36.120.59.71.812.340.857.366.142.823.05.3

us-gaap:BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh

us-gaap:BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh


Business
Period End2020-12-31
Value4300000.0
Percentage of BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh100.0

us-gaap:BusinessCombinationContingentConsiderationLiability

us-gaap:BusinessCombinationContingentConsiderationLiability


Business
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312012-12-31
Value3900000.03600000.03500000.03100000.03200000.03300000.01800000.01700000.01700000.05200000.05000000.05000000.04900000.08000000.08500000.08200000.08000000.07800000.07900000.06000000.05700000.05200000.05100000.05000000.05100000.04900000.04700000.04300000.03300000.0
Percentage of BusinessCombinationContingentConsiderationLiability100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:BusinessCombinationContingentConsiderationLiability us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:FairValueInputsLevel3


Business
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312012-12-31
Value3900000.03600000.03500000.03100000.03200000.03300000.01800000.01700000.01700000.05200000.05000000.05000000.04900000.08000000.08500000.08200000.08000000.07800000.07900000.06000000.05700000.05200000.05100000.05000000.05100000.04900000.04700000.04300000.03300000.0
Percentage of BusinessCombinationContingentConsiderationLiability100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ContractWithCustomerAssetNet

us-gaap:ContractWithCustomerAssetNet


Contract
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value12101616169.89.4119.17.66.06.47.5
Percentage of ContractWithCustomerAssetNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ContractWithCustomerLiability

us-gaap:ContractWithCustomerLiability


Contract
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value45575640413430363330242233
Percentage of ContractWithCustomerLiability100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ContractWithCustomerLiability us-gaap:ProductOrService

wst:SmartDose


Contract
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-03-312018-12-312018-09-302018-06-302018-03-312013-06-30
Value4.54.75.05.25.45.65.96.36.56.76.97.120
Percentage of ContractWithCustomerLiability10.08.28.812.912.916.019.117.319.522.328.532.10.0

us-gaap:ContractWithCustomerLiabilityNoncurrent us-gaap:ProductOrService

us-gaap:ContractWithCustomerLiabilityNoncurrent

wst:SmartDose


Contract
Period End2021-03-312020-12-312020-09-30
Value3600000.03800000.04100000.0
Percentage of ContractWithCustomerLiabilityNoncurrent100.0100.0100.0

us-gaap:DebtInstrumentCarryingAmount

us-gaap:DebtInstrumentCarryingAmount


Debt
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-10-022017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-31
Value25525525625625725819519619619619719819733229229228228232232299
Percentage of DebtInstrumentCarryingAmount100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DebtInstrumentCarryingAmount us-gaap:LongtermDebtType

wst:TermLoanDue2024


Debt
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-31
Value878788888990
Percentage of DebtInstrumentCarryingAmount34.234.334.534.634.734.9

us-gaap:DeferredCompensationLiabilityClassifiedNoncurrent

us-gaap:DeferredCompensationLiabilityClassifiedNoncurrent


Deferred
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-31
Value22221210101211109.8109.99.49.99.59.68.98.46.86.88.88.29.19.08.77.97.71012
Percentage of DeferredCompensationLiabilityClassifiedNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredCompensationLiabilityClassifiedNoncurrent us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:FairValueInputsLevel1


Deferred
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-31
Value1210101211109.8109.99.49.99.59.68.98.46.86.88.88.29.19.08.77.97.71012
Percentage of DeferredCompensationLiabilityClassifiedNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredCompensationPlanAssets

us-gaap:DeferredCompensationPlanAssets


Deferred
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-31
Value131211119.3119.99.28.79.48.88.38.98.58.07.57.46.46.46.86.46.96.66.66.16.15.85.7
Percentage of DeferredCompensationPlanAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredCompensationPlanAssets us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:FairValueInputsLevel1


Deferred
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-31
Value131211119.3119.99.28.79.48.88.38.98.58.07.57.46.46.46.86.46.96.66.66.16.15.85.7
Percentage of DeferredCompensationPlanAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredIncomeTaxAssetsNet

us-gaap:DeferredIncomeTaxAssetsNet


Deferred
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-31
Value271622131214
Percentage of DeferredIncomeTaxAssetsNet100.0100.0100.0100.0100.0100.0

us-gaap:DeferredIncomeTaxLiabilities

us-gaap:DeferredIncomeTaxLiabilities


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312014-12-312013-12-312012-12-312011-12-31
Value4945393944454647
Percentage of DeferredIncomeTaxLiabilities100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredRevenueCurrent

us-gaap:DeferredRevenueCurrent


Deferred
Period End2020-12-312019-12-312018-12-31
Value512725
Percentage of DeferredRevenueCurrent100.0100.0100.0

us-gaap:DeferredTaxAssetsOperatingLossCarryforwards

us-gaap:DeferredTaxAssetsOperatingLossCarryforwards


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312014-12-312013-12-312012-12-312011-12-31
Value2121181920202121
Percentage of DeferredTaxAssetsOperatingLossCarryforwards100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxAssetsOperatingLossCarryforwardsForeign

us-gaap:DeferredTaxAssetsOperatingLossCarryforwardsForeign


Deferred
Period End2020-12-31
Value7400000.0
Percentage of DeferredTaxAssetsOperatingLossCarryforwardsForeign100.0

us-gaap:DeferredTaxAssetsOperatingLossCarryforwardsNotSubjectToExpiration us-gaap:IncomeTaxAuthority

us-gaap:DeferredTaxAssetsOperatingLossCarryforwardsNotSubjectToExpiration

us-gaap:ForeignCountry


Deferred
Period End2020-12-31
Value54
Percentage of DeferredTaxAssetsOperatingLossCarryforwardsNotSubjectToExpiration100.0

us-gaap:DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal

us-gaap:DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal


Deferred
Period End2020-12-31
Value14
Percentage of DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal100.0

us-gaap:DeferredTaxAssetsOther

us-gaap:DeferredTaxAssetsOther


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312014-12-312013-12-312012-12-312011-12-31
Value109.211142019159.3
Percentage of DeferredTaxAssetsOther100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxAssetsTaxCreditCarryforwards

us-gaap:DeferredTaxAssetsTaxCreditCarryforwards


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312014-12-312013-12-312012-12-312011-12-31
Value2.02.8101340363742
Percentage of DeferredTaxAssetsTaxCreditCarryforwards100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits

us-gaap:DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312014-12-312013-12-312012-12-312011-12-31
Value3525272843516962
Percentage of DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxLiabilitiesOther

us-gaap:DeferredTaxLiabilitiesOther


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312014-12-312013-12-312012-12-312011-12-31
Value400000.0900000.02000000.03800000.07700000.05400000.03900000.06500000.0
Percentage of DeferredTaxLiabilitiesOther100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxLiabilitiesPropertyPlantAndEquipment

us-gaap:DeferredTaxLiabilitiesPropertyPlantAndEquipment


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312014-12-312013-12-312012-12-312011-12-31
Value4237312636404241
Percentage of DeferredTaxLiabilitiesPropertyPlantAndEquipment100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxLiabilitiesUndistributedForeignEarnings

us-gaap:DeferredTaxLiabilitiesUndistributedForeignEarnings


Deferred
Period End2020-12-312019-12-312018-12-312017-12-31
Value6500000.06300000.06600000.09800000.0
Percentage of DeferredTaxLiabilitiesUndistributedForeignEarnings100.0100.0100.0100.0

us-gaap:DefinedBenefitPlanAccumulatedBenefitObligation

us-gaap:DefinedBenefitPlanAccumulatedBenefitObligation


Defined
Period End2020-12-312019-12-312018-12-312017-12-312014-12-312013-12-312012-12-312011-12-31
Value293283263283391355358316
Percentage of DefinedBenefitPlanAccumulatedBenefitObligation100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DefinedBenefitPlanAccumulatedBenefitObligation us-gaap:RetirementPlanSponsorLocation

us-gaap:ForeignPlan


Defined
Period End2020-12-312019-12-312018-12-312017-12-31
Value83736467
Percentage of DefinedBenefitPlanAccumulatedBenefitObligation28.326.024.323.7

us-gaap:DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-31
Value-5.8-8.0-11.1-12.8
Percentage of DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax100.0100.0100.0100.0

us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-31
Value68707373
Percentage of DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax-1174.1-877.5-665.8-575.8

us-gaap:DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-31
Value5.47.09.410
Percentage of DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax100.0100.0100.0100.0

us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-31
Value-67.3-69.4-73.0-74.5
Percentage of DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax-1246.3-991.4-776.6-716.3

us-gaap:DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-31
Value-400000.0-1000000.0-1700000.0-2400000.0
Percentage of DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax100.0100.0100.0100.0

us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-31
Value800000.0800000.0900000.0-800000.0
Percentage of DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax-200.0-80.0-52.933.3

us-gaap:DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent

us-gaap:DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent


Defined
Period End2021-03-312020-12-312020-06-302020-03-312019-12-312018-12-31
Value14120.05.24.30.0
Percentage of DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent100.0100.00.0100.0100.00.0

us-gaap:DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate us-gaap:RetirementPlanSponsorLocation

us-gaap:DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate

country:US


Defined
Period End2020-12-312019-12-31
Value2.60.0335
Percentage of DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate100.0100.0

us-gaap:ForeignPlan


Defined
Period End2020-12-312019-12-312018-12-312017-12-31
Value0.890.01280.02190.0162
Percentage of DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate34.238.20.00.0

us-gaap:DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate us-gaap:RetirementPlanType

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-31
Value2.30.0320.0420.0345
Percentage of DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate88.595.50.00.0

us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-31
Value2.10.02790.03760.0314
Percentage of DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate80.883.30.00.0

us-gaap:DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncrease us-gaap:RetirementPlanSponsorLocation

us-gaap:DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncrease

us-gaap:ForeignPlan


Defined
Period End2020-12-312019-12-312018-12-312017-12-31
Value2.580.02490.0260.0244
Percentage of DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncrease100.0100.0100.0100.0

us-gaap:DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncrease us-gaap:RetirementPlanType

us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-31
Value2.580.02490.04010.038
Percentage of DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncrease100.0100.0154.2155.7

us-gaap:DefinedBenefitPlanBenefitObligation us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanBenefitObligation

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value6.16.66.07.18.0
Percentage of DefinedBenefitPlanBenefitObligation100.0100.0100.0100.0100.0

us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value298287267288262
Percentage of DefinedBenefitPlanBenefitObligation4900.04362.14450.04056.33277.5

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter


Defined
Period End2020-12-312019-12-312018-12-312014-12-312013-12-312012-12-31
Value747386150149191
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter100.0100.0100.0100.0100.0100.0

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter us-gaap:RetirementPlanSponsorLocation

country:US


Defined
Period End2020-12-312019-12-31
Value5460
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter73.082.0

us-gaap:ForeignPlan


Defined
Period End2020-12-312019-12-312018-12-31
Value201316
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter27.018.019.6

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths


Defined
Period End2020-12-312019-12-312018-12-312014-12-312013-12-312012-12-31
Value242215233320
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths100.0100.0100.0100.0100.0100.0

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths us-gaap:RetirementPlanSponsorLocation

country:US


Defined
Period End2020-12-312019-12-31
Value2121
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths90.194.2

us-gaap:ForeignPlan


Defined
Period End2020-12-312019-12-312018-12-31
Value2.41.32.1
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths9.95.813.4

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive


Defined
Period End2020-12-312019-12-312018-12-312014-12-312013-12-312012-12-31
Value171517282627
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive100.0100.0100.0100.0100.0100.0

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive us-gaap:RetirementPlanSponsorLocation

country:US


Defined
Period End2020-12-312019-12-31
Value1313
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive77.287.7

us-gaap:ForeignPlan


Defined
Period End2020-12-312019-12-312018-12-31
Value3.91.92.3
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive22.812.313.4

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour


Defined
Period End2020-12-312019-12-312018-12-312014-12-312013-12-312012-12-31
Value171517272624
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour100.0100.0100.0100.0100.0100.0

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour us-gaap:RetirementPlanSponsorLocation

country:US


Defined
Period End2020-12-312019-12-31
Value1413
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour81.490.1

us-gaap:ForeignPlan


Defined
Period End2020-12-312019-12-312018-12-31
Value3.21.52.9
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour18.69.916.5

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree


Defined
Period End2020-12-312019-12-312018-12-312014-12-312013-12-312012-12-31
Value161716262322
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree100.0100.0100.0100.0100.0100.0

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree us-gaap:RetirementPlanSponsorLocation

country:US


Defined
Period End2020-12-312019-12-31
Value1415
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree85.288.2

us-gaap:ForeignPlan


Defined
Period End2020-12-312019-12-312018-12-31
Value2.52.02.2
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree14.811.813.5

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo


Defined
Period End2020-12-312019-12-312018-12-312014-12-312013-12-312012-12-31
Value171417242221
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo100.0100.0100.0100.0100.0100.0

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo us-gaap:RetirementPlanSponsorLocation

country:US


Defined
Period End2020-12-312019-12-31
Value1413
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo83.191.2

us-gaap:ForeignPlan


Defined
Period End2020-12-312019-12-312018-12-31
Value3.01.32.7
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo16.98.815.6

us-gaap:DefinedBenefitPlanExpectedFutureEmployerContributionsNextFiscalYear

us-gaap:DefinedBenefitPlanExpectedFutureEmployerContributionsNextFiscalYear


Defined
Period End2020-12-312019-12-312018-12-31
Value3600000.0700000.03200000.0
Percentage of DefinedBenefitPlanExpectedFutureEmployerContributionsNextFiscalYear100.0100.0100.0

us-gaap:DefinedBenefitPlanExpectedFutureEmployerContributionsNextFiscalYear us-gaap:RetirementPlanSponsorLocation

us-gaap:ForeignPlan


Defined
Period End2020-12-312018-12-31
Value2900000.02300000.0
Percentage of DefinedBenefitPlanExpectedFutureEmployerContributionsNextFiscalYear80.671.9

us-gaap:DefinedBenefitPlanFairValueOfPlanAssets

us-gaap:DefinedBenefitPlanFairValueOfPlanAssets


Defined
Period End2020-12-312019-12-312018-12-312017-12-312014-12-312013-12-312012-12-312011-12-31
Value258244214239322284251213
Percentage of DefinedBenefitPlanFairValueOfPlanAssets100.0100.0100.0100.0100.0100.0100.0100.0

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

us-gaap:DefinedBenefitPlanCash, us-gaap:FairValueInputsLevel1


Defined
Period End2020-12-312019-12-31
Value1.52.2
Percentage of DefinedBenefitPlanFairValueOfPlanAssets0.60.9

us-gaap:DefinedBenefitPlanCash, us-gaap:FairValueInputsLevel12And3


Defined
Period End2020-12-312019-12-31
Value1.52.2
Percentage of DefinedBenefitPlanFairValueOfPlanAssets0.60.9

us-gaap:DefinedBenefitPlanEquitySecurities, us-gaap:FairValueInputsLevel12And3


Defined
Period End2020-12-312019-12-31
Value2015
Percentage of DefinedBenefitPlanFairValueOfPlanAssets8.06.3

us-gaap:DefinedBenefitPlanEquitySecurities, us-gaap:FairValueInputsLevel2


Defined
Period End2020-12-312019-12-31
Value2014
Percentage of DefinedBenefitPlanFairValueOfPlanAssets8.05.8

us-gaap:MutualFund, us-gaap:FairValueInputsLevel12And3


Defined
Period End2020-12-312019-12-31
Value1821
Percentage of DefinedBenefitPlanFairValueOfPlanAssets7.28.9

us-gaap:MutualFund, us-gaap:FairValueInputsLevel2


Defined
Period End2020-12-312019-12-31
Value1817
Percentage of DefinedBenefitPlanFairValueOfPlanAssets7.27.3

wst:OtherMutualFunds, us-gaap:FairValueInputsLevel12And3


Defined
Period End2020-12-31
Value2.9
Percentage of DefinedBenefitPlanFairValueOfPlanAssets1.1

wst:OtherMutualFunds, us-gaap:FairValueInputsLevel2


Defined
Period End2020-12-31
Value2.9
Percentage of DefinedBenefitPlanFairValueOfPlanAssets1.1

us-gaap:DefinedBenefitPlanFairValueOfPlanAssets us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:FairValueInputsLevel1


Defined
Period End2020-12-312019-12-312014-12-312013-12-312012-12-312011-12-31
Value1.57.3321283249212
Percentage of DefinedBenefitPlanFairValueOfPlanAssets0.63.099.799.699.599.4

us-gaap:FairValueInputsLevel12And3


Defined
Period End2020-12-312019-12-31
Value4339
Percentage of DefinedBenefitPlanFairValueOfPlanAssets16.916.1

us-gaap:FairValueInputsLevel2


Defined
Period End2020-12-312019-12-312018-12-312017-12-312014-12-312013-12-312012-12-312011-12-31
Value42320.00.01.01.21.31.3
Percentage of DefinedBenefitPlanFairValueOfPlanAssets16.413.20.00.00.30.40.50.6

us-gaap:FairValueMeasuredAtNetAssetValuePerShare


Defined
Period End2020-12-312019-12-31
Value214204
Percentage of DefinedBenefitPlanFairValueOfPlanAssets83.183.9

us-gaap:DefinedBenefitPlanFairValueOfPlanAssets us-gaap:RetirementPlanSponsorLocation

us-gaap:ForeignPlan


Defined
Period End2020-12-312019-12-312018-12-312017-12-31
Value43393334
Percentage of DefinedBenefitPlanFairValueOfPlanAssets17.016.115.614.5

us-gaap:DefinedBenefitPlanFairValueOfPlanAssets us-gaap:RetirementPlanType

us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value258244214239192
Percentage of DefinedBenefitPlanFairValueOfPlanAssets100.0100.0100.0100.00.0

us-gaap:DefinedBenefitPlanFundedStatusOfPlan us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanFundedStatusOfPlan

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-31
Value-6100000.0-6600000.0-6000000.0-7100000.0
Percentage of DefinedBenefitPlanFundedStatusOfPlan100.0100.0100.0100.0

us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-31
Value-40800000.0-43800000.0-52500000.0-48500000.0
Percentage of DefinedBenefitPlanFundedStatusOfPlan668.9663.6875.0683.1

us-gaap:DefinedBenefitPlanHealthCareCostTrendRateAssumedNextFiscalYear

us-gaap:DefinedBenefitPlanHealthCareCostTrendRateAssumedNextFiscalYear


Defined
Period End2020-12-31
Value6.5
Percentage of DefinedBenefitPlanHealthCareCostTrendRateAssumedNextFiscalYear100.0

us-gaap:DefinedBenefitPlanUltimateHealthCareCostTrendRate1

us-gaap:DefinedBenefitPlanUltimateHealthCareCostTrendRate1


Defined
Period End2020-12-31
Value5.0
Percentage of DefinedBenefitPlanUltimateHealthCareCostTrendRate1100.0

us-gaap:DefinedBenefitPlanWeightedAverageAssetAllocations us-gaap:DefinedBenefitPlanByPlanAssetCategories

us-gaap:DefinedBenefitPlanWeightedAverageAssetAllocations

us-gaap:DefinedBenefitPlanDebtSecurity


Defined
Period End2020-12-312019-12-31
Value64.065.0
Percentage of DefinedBenefitPlanWeightedAverageAssetAllocations100.0100.0

us-gaap:DefinedBenefitPlanEquitySecurities


Defined
Period End2020-12-312019-12-31
Value34.033.0
Percentage of DefinedBenefitPlanWeightedAverageAssetAllocations53.150.8

us-gaap:DerivativeAssets us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FinancialInstrument

us-gaap:DerivativeAssets

us-gaap:FairValueInputsLevel2, us-gaap:Commodity


Derivative
Period End2021-03-312020-12-312020-09-302019-12-31
Value900000.0300000.0100000.0100000.0
Percentage of DerivativeAssets100.0100.0100.0100.0

us-gaap:DerivativeAssets us-gaap:FinancialInstrument

us-gaap:Commodity


Derivative
Period End2021-03-312020-12-312020-09-302019-12-31
Value900000.0300000.0100000.0100000.0
Percentage of DerivativeAssets100.0100.0100.0100.0

us-gaap:DerivativeAveragePriceRiskOptionStrikePrice us-gaap:DerivativeInstrumentRisk

us-gaap:DerivativeAveragePriceRiskOptionStrikePrice

us-gaap:Option


Derivative
Period End2021-03-312020-12-312020-09-30
Value60.9959.1460.47
Percentage of DerivativeAveragePriceRiskOptionStrikePrice100.0100.0100.0

us-gaap:DerivativeLiabilitiesCurrent

us-gaap:DerivativeLiabilitiesCurrent


Derivative
Period End2020-12-312019-12-31
Value9500000.0200000.0
Percentage of DerivativeLiabilitiesCurrent100.0100.0

us-gaap:DerivativeNotionalAmount us-gaap:Currency, us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation, us-gaap:Position

us-gaap:DerivativeNotionalAmount

currency:EUR, us-gaap:ForeignExchangeForward, us-gaap:DesignatedAsHedgingInstrument, us-gaap:Long


Derivative
Period End2021-03-31
Value37
Percentage of DerivativeNotionalAmount100.0

currency:EUR, us-gaap:ForeignExchangeForward, us-gaap:DesignatedAsHedgingInstrument, us-gaap:Short


Derivative
Period End2021-03-31
Value46
Percentage of DerivativeNotionalAmount122.0

currency:JPY, us-gaap:ForeignExchangeForward, us-gaap:DesignatedAsHedgingInstrument, us-gaap:Long


Derivative
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value8666719498766856917565505921
Percentage of DerivativeNotionalAmount22927.00.00.00.00.00.00.0

currency:JPY, us-gaap:ForeignExchangeForward, us-gaap:DesignatedAsHedgingInstrument, us-gaap:Short


Derivative
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value36425533453731
Percentage of DerivativeNotionalAmount96.00.00.00.00.00.00.0

currency:SGD, us-gaap:ForeignExchangeForward, us-gaap:DesignatedAsHedgingInstrument, us-gaap:Long


Derivative
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value65425744592931
Percentage of DerivativeNotionalAmount172.00.00.00.00.00.00.0

currency:SGD, us-gaap:ForeignExchangeForward, us-gaap:DesignatedAsHedgingInstrument, us-gaap:Short


Derivative
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value37253325351618
Percentage of DerivativeNotionalAmount98.90.00.00.00.00.00.0

currency:USD, us-gaap:ForeignExchangeForward, us-gaap:DesignatedAsHedgingInstrument, us-gaap:Long


Derivative
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value50577439523839
Percentage of DerivativeNotionalAmount133.10.00.00.00.00.00.0

currency:USD, us-gaap:ForeignExchangeForward, us-gaap:DesignatedAsHedgingInstrument, us-gaap:Short


Derivative
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value4249640.00.00.00.0
Percentage of DerivativeNotionalAmount113.00.00.00.00.00.00.0

us-gaap:DueFromAffiliates

us-gaap:DueFromAffiliates


Due
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-03-312018-12-312017-12-312014-12-312013-12-312012-12-312011-12-31
Value1700000.01400000.01700000.01800000.02600000.01900000.01400000.01400000.01600000.01300000.0600000.0300000.0600000.01300000.0
Percentage of DueFromAffiliates100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DueToAffiliateCurrentAndNoncurrent

us-gaap:DueToAffiliateCurrentAndNoncurrent


Due
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-03-312018-12-312017-12-312014-12-312013-12-312012-12-312011-12-31
Value183328182220241712125.95.6109.2
Percentage of DueToAffiliateCurrentAndNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized

us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized


Employee
Period End2020-12-31
Value31
Percentage of EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized100.0

us-gaap:EquityMethodInvestmentOwnershipPercentage us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

us-gaap:EquityMethodInvestmentOwnershipPercentage

wst:AluplastSADeCV


Equity
Period End2020-12-312019-12-312018-12-312014-12-312013-12-312012-12-31
Value49.00.490.490.490.490.49
Percentage of EquityMethodInvestmentOwnershipPercentage100.0100.0100.0100.0100.0100.0

wst:DaikyoSeikoLtdDaikyo


Equity
Period End2020-12-312019-12-312019-11-012019-10-312018-12-312014-12-312013-12-312012-12-31
Value49.00.490.4925.00.250.250.250.25
Percentage of EquityMethodInvestmentOwnershipPercentage100.0100.00.00.051.051.051.051.0

wst:IWPharmaGroupLLC


Equity
Period End2020-12-312019-12-31
Value49.00.49
Percentage of EquityMethodInvestmentOwnershipPercentage100.0100.0

wst:PharmaRubberSADeCV


Equity
Period End2020-12-312019-12-312018-12-312014-12-312013-12-312012-12-31
Value49.00.490.490.490.490.49
Percentage of EquityMethodInvestmentOwnershipPercentage100.0100.0100.0100.0100.0100.0

wst:PharmaTapSADeCV


Equity
Period End2020-12-312019-12-312018-12-312014-12-312013-12-312012-12-31
Value49.00.490.490.490.490.49
Percentage of EquityMethodInvestmentOwnershipPercentage100.0100.0100.0100.0100.0100.0

wst:WestCompanyMexicoSADeCV


Equity
Period End2020-12-312019-12-312018-12-312014-12-312013-12-312012-12-31
Value49.00.490.490.490.490.49
Percentage of EquityMethodInvestmentOwnershipPercentage100.0100.0100.0100.0100.0100.0

us-gaap:EquityMethodInvestments

us-gaap:EquityMethodInvestments


Equity
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-312014-12-312013-12-312012-12-312011-12-31
Value201201194186184179848177777876727170676968645657575956
Percentage of EquityMethodInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EquitySecuritiesWithoutReadilyDeterminableFairValueAmount

us-gaap:EquitySecuritiesWithoutReadilyDeterminableFairValueAmount


Equity
Period End2021-03-312020-12-312020-09-302020-06-302019-12-31
Value1012151313
Percentage of EquitySecuritiesWithoutReadilyDeterminableFairValueAmount100.0100.0100.0100.0100.0

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue


Fair
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us-gaap:FiniteLivedIntangibleAssetsAccumulatedAmortization

us-gaap:FiniteLivedIntangibleAssetsAccumulatedAmortization


Finite
Period End2020-12-312019-12-312018-12-312017-12-312014-12-312013-12-312012-12-312011-12-31
Value5248444234292925
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us-gaap:CustomerContracts


Finite
Period End2020-12-312019-12-312018-12-312017-12-312014-12-312013-12-312012-12-312011-12-31
Value7.97.46.86.34.84.23.73.1
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us-gaap:CustomerRelationships


Finite
Period End2020-12-312019-12-312018-12-312017-12-312014-12-312013-12-312012-12-312011-12-31
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Finite
Period End2020-12-312019-12-312018-12-312017-12-312014-12-312013-12-312012-12-31
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us-gaap:Trademarks


Finite
Period End2020-12-312019-12-312018-12-312017-12-312014-12-312013-12-312012-12-312011-12-31
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wst:PatentsAndLicensing


Finite
Period End2020-12-312019-12-312018-12-312017-12-312014-12-312013-12-312012-12-312011-12-31
Value17161514119.47.86.7
Percentage of FiniteLivedIntangibleAssetsAccumulatedAmortization34.033.133.633.433.532.026.526.3

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths


Finite
Period End2020-12-31
Value3800000.0
Percentage of FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths100.0

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearFive

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearFive


Finite
Period End2020-12-31
Value3400000.0
Percentage of FiniteLivedIntangibleAssetsAmortizationExpenseYearFive100.0

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearFour

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearFour


Finite
Period End2020-12-31
Value3600000.0
Percentage of FiniteLivedIntangibleAssetsAmortizationExpenseYearFour100.0

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearThree

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearThree


Finite
Period End2020-12-31
Value3700000.0
Percentage of FiniteLivedIntangibleAssetsAmortizationExpenseYearThree100.0

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo


Finite
Period End2020-12-31
Value3800000.0
Percentage of FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo100.0

us-gaap:FiniteLivedIntangibleAssetsGross

us-gaap:FiniteLivedIntangibleAssetsGross


Finite
Period End2020-12-312019-12-312018-12-312017-12-312014-12-312013-12-312012-12-312011-12-31
Value8378656376778077
Percentage of FiniteLivedIntangibleAssetsGross100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FiniteLivedIntangibleAssetsGross us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:CustomerContracts


Finite
Period End2020-12-312019-12-312018-12-312017-12-312014-12-312013-12-312012-12-312011-12-31
Value1111111111111111
Percentage of FiniteLivedIntangibleAssetsGross13.314.116.917.414.715.114.514.7

us-gaap:CustomerRelationships


Finite
Period End2020-12-312019-12-312018-12-312017-12-312014-12-312013-12-312012-12-312011-12-31
Value4040292929292929
Percentage of FiniteLivedIntangibleAssetsGross49.251.644.945.938.738.237.138.3

us-gaap:InProcessResearchAndDevelopment


Finite
Period End2020-12-312019-12-312018-12-312017-12-312014-12-312013-12-312012-12-31
Value3.33.33.33.33.43.53.5
Percentage of FiniteLivedIntangibleAssetsGross4.04.25.15.24.54.54.4

us-gaap:Trademarks


Finite
Period End2020-12-312019-12-312018-12-312017-12-312014-12-312013-12-312012-12-312011-12-31
Value2.02.02.02.012121212
Percentage of FiniteLivedIntangibleAssetsGross2.42.63.13.115.915.615.115.5

wst:PatentsAndLicensing


Finite
Period End2020-12-312019-12-312018-12-312017-12-312014-12-312013-12-312012-12-312011-12-31
Value2521191820201917
Percentage of FiniteLivedIntangibleAssetsGross31.127.530.128.526.326.624.021.9

us-gaap:ForeignCurrencyContractAssetFairValueDisclosure

us-gaap:ForeignCurrencyContractAssetFairValueDisclosure


Foreign
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-312015-09-302015-06-302015-03-312014-12-312014-09-30
Value5.73.01.10.11.27.713176.52.83.43.70.51.00.11.60.20.61.50.21.01.94.40.20.8
Percentage of ForeignCurrencyContractAssetFairValueDisclosure100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ForeignCurrencyContractAssetFairValueDisclosure us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:FairValueInputsLevel2


Foreign
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-312015-09-302015-06-302015-03-312014-12-312014-09-30
Value5.73.01.10.11.27.713176.52.83.43.70.51.00.11.60.20.61.50.21.01.94.40.20.8
Percentage of ForeignCurrencyContractAssetFairValueDisclosure100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ForeignCurrencyContractAssetFairValueDisclosure us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FinancialInstrument

us-gaap:FairValueInputsLevel2, us-gaap:CurrencySwap


Foreign
Period End2021-03-31
Value0.9
Percentage of ForeignCurrencyContractAssetFairValueDisclosure15.8

us-gaap:ForeignCurrencyContractAssetFairValueDisclosure us-gaap:FinancialInstrument

us-gaap:CurrencySwap


Foreign
Period End2021-03-31
Value0.9
Percentage of ForeignCurrencyContractAssetFairValueDisclosure15.8

us-gaap:ForeignCurrencyContractsLiabilityFairValueDisclosure us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FinancialInstrument

us-gaap:ForeignCurrencyContractsLiabilityFairValueDisclosure

us-gaap:FairValueInputsLevel2, us-gaap:CurrencySwap


Foreign
Period End2020-12-312020-09-302019-12-31
Value5.64.01.4
Percentage of ForeignCurrencyContractsLiabilityFairValueDisclosure100.0100.0100.0

us-gaap:FairValueInputsLevel2, us-gaap:ForeignExchangeContract


Foreign
Period End2021-03-312020-12-312020-09-302019-12-31
Value5.29.7130.3
Percentage of ForeignCurrencyContractsLiabilityFairValueDisclosure0.0173.2342.521.4

us-gaap:ForeignCurrencyContractsLiabilityFairValueDisclosure us-gaap:FinancialInstrument

us-gaap:CurrencySwap


Foreign
Period End2020-12-312020-09-302019-12-31
Value5.64.01.4
Percentage of ForeignCurrencyContractsLiabilityFairValueDisclosure100.0100.0100.0

us-gaap:ForeignExchangeContract


Foreign
Period End2021-03-312020-12-312020-09-302019-12-31
Value5.29.7130.3
Percentage of ForeignCurrencyContractsLiabilityFairValueDisclosure0.0173.2342.521.4

us-gaap:InterestPayableCurrent

us-gaap:InterestPayableCurrent


Interest
Period End2020-12-312019-12-312018-12-31
Value3300000.03300000.03400000.0
Percentage of InterestPayableCurrent100.0100.0100.0

us-gaap:InventoryFinishedGoodsNetOfReserves

us-gaap:InventoryFinishedGoodsNetOfReserves


Inventory
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value1331321131131039792878175798394929297928685767879807682808280747071656967687165
Percentage of InventoryFinishedGoodsNetOfReserves100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InventoryRawMaterialsNetOfReserves

us-gaap:InventoryRawMaterialsNetOfReserves


Inventory
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value116133125112104100991009093909288898581788280747878757977767572716770686665646560
Percentage of InventoryRawMaterialsNetOfReserves100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InventoryWorkInProcessNetOfReserves

us-gaap:InventoryWorkInProcessNetOfReserves


Inventory
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value60545549433738394238394031333333283232303130272526312924272324252219212321
Percentage of InventoryWorkInProcessNetOfReserves100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths


Lessee
Period End2021-03-312020-12-312020-09-302020-06-302019-12-31
Value1012111112
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths100.0100.0100.0100.0100.0

us-gaap:LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear

us-gaap:LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear


Lessee
Period End2021-03-312020-09-302020-03-312019-12-31
Value8.93.49.012
Percentage of LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear100.0100.0100.0100.0

us-gaap:LiabilitiesFairValueDisclosure

us-gaap:LiabilitiesFairValueDisclosure


Liabilities
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value2433342321171313112122161922231719161617161717171717202245840638631630515151513
Percentage of LiabilitiesFairValueDisclosure100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LiabilitiesFairValueDisclosure us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:FairValueInputsLevel1


Liabilities
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value15141210101211109.8109.99.49.99.59.68.98.46.86.88.88.29.19.08.77.97.710128.87.66.96.05.44.64.45.35.4
Percentage of LiabilitiesFairValueDisclosure62.243.437.645.147.771.985.180.883.848.843.256.049.742.441.049.744.242.541.251.850.053.252.050.346.244.350.555.01.91.91.81.91.829.728.435.339.1

us-gaap:FairValueInputsLevel2


Liabilities
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value5.215179.88.01.70.20.80.25.88.02.45.14.95.30.82.61.41.82.22.52.83.23.64.14.85.45.64463963763072988.89.28.06.1
Percentage of LiabilitiesFairValueDisclosure21.645.852.141.737.49.61.56.21.727.034.914.325.621.922.64.513.78.810.912.915.216.418.520.824.027.626.525.597.497.397.497.397.556.859.453.344.2

us-gaap:FairValueInputsLevel3


Liabilities
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value3.93.63.53.13.23.31.81.71.75.25.05.04.98.08.58.28.07.87.96.05.75.25.15.05.14.94.74.33.33.33.02.52.32.11.91.72.3
Percentage of LiabilitiesFairValueDisclosure16.210.810.313.215.018.513.413.114.524.221.829.824.635.736.345.842.148.847.935.334.830.429.528.929.828.223.019.50.70.80.80.80.813.512.311.316.7

us-gaap:LineOfCredit us-gaap:CreditFacility, us-gaap:LongtermDebtType

us-gaap:LineOfCredit

us-gaap:LetterOfCredit, wst:Revolvingcreditfacilitydue2024


Line
Period End2020-09-30
Value2500000.0
Percentage of LineOfCredit100.0

us-gaap:LineOfCreditFacilityCurrentBorrowingCapacity us-gaap:LongtermDebtType

us-gaap:LineOfCreditFacilityCurrentBorrowingCapacity

wst:Revolvingcreditfacilitydue2024


Line
Period End2020-09-30
Value300
Percentage of LineOfCreditFacilityCurrentBorrowingCapacity100.0

us-gaap:LineOfCreditFacilityRemainingBorrowingCapacity us-gaap:LongtermDebtType

us-gaap:LineOfCreditFacilityRemainingBorrowingCapacity

wst:Revolvingcreditfacilitydue2024


Line
Period End2020-09-30
Value297
Percentage of LineOfCreditFacilityRemainingBorrowingCapacity100.0

us-gaap:LongTermDebtFairValue

us-gaap:LongTermDebtFairValue


Long
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-03-312012-12-312012-09-302012-06-302011-12-312011-09-302011-06-302010-12-31
Value264265266267260263204197192192194198201201199196228240243225231229237311320359387365435386364299279302361344
Percentage of LongTermDebtFairValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive


Long
Period End2020-12-31
Value73
Percentage of LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive100.0

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths


Long
Period End2020-12-31
Value2300000.0
Percentage of LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths100.0

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive


Long
Period End2020-12-31
Value0
Percentage of LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive0.0

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour


Long
Period End2020-12-31
Value134
Percentage of LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour100.0

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree


Long
Period End2020-12-31
Value2200000.0
Percentage of LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree100.0

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo


Long
Period End2020-12-31
Value44
Percentage of LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo100.0

us-gaap:LossContingencyAccrualAtCarryingValue us-gaap:LossContingenciesByNatureOfContingency

us-gaap:LossContingencyAccrualAtCarryingValue

us-gaap:InsuranceClaims


Loss
Period End2020-12-31
Value3000000.0
Percentage of LossContingencyAccrualAtCarryingValue100.0

us-gaap:LossContingencyReceivable us-gaap:LossContingenciesByNatureOfContingency

us-gaap:LossContingencyReceivable

us-gaap:InsuranceClaims


Loss
Period End2020-12-31
Value900000.0
Percentage of LossContingencyReceivable100.0

us-gaap:OperatingLeaseWeightedAverageDiscountRatePercent

us-gaap:OperatingLeaseWeightedAverageDiscountRatePercent


Operating
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-31
Value3.673.683.740.03750.03770.0376
Percentage of OperatingLeaseWeightedAverageDiscountRatePercent100.0100.0100.0100.0100.0100.0

us-gaap:OperatingLossCarryforwards us-gaap:IncomeTaxAuthority

us-gaap:OperatingLossCarryforwards

us-gaap:ForeignCountry


Operating
Period End2020-12-312019-12-312018-12-312014-12-312013-12-312012-12-31
Value564923222424
Percentage of OperatingLossCarryforwards100.0100.0100.0100.0100.0100.0

us-gaap:StateAndLocalJurisdiction


Operating
Period End2020-12-312019-12-312018-12-312014-12-312013-12-312012-12-31
Value204226233267262256
Percentage of OperatingLossCarryforwards360.0459.31006.51186.71056.91035.5

us-gaap:OperatingLossCarryforwards us-gaap:IncomeTaxAuthority, wst:ExpirationPeriod

us-gaap:StateAndLocalJurisdiction, wst:Year2021


Operating
Period End2020-12-31
Value25
Percentage of OperatingLossCarryforwards45.3

us-gaap:StateAndLocalJurisdiction, wst:YearAfter2021


Operating
Period End2020-12-31
Value178
Percentage of OperatingLossCarryforwards314.6

us-gaap:OtherDeferredCompensationArrangementsLiabilityClassifiedNoncurrent

us-gaap:OtherDeferredCompensationArrangementsLiabilityClassifiedNoncurrent


Other
Period End2021-03-312020-12-312019-12-31
Value151412
Percentage of OtherDeferredCompensationArrangementsLiabilityClassifiedNoncurrent100.0100.0100.0

us-gaap:OtherDeferredCompensationArrangementsLiabilityClassifiedNoncurrent us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:FairValueInputsLevel1


Other
Period End2021-03-312020-12-312019-12-31
Value151412
Percentage of OtherDeferredCompensationArrangementsLiabilityClassifiedNoncurrent100.0100.0100.0

us-gaap:OtherEmployeeRelatedLiabilitiesCurrent

us-gaap:OtherEmployeeRelatedLiabilitiesCurrent


Other
Period End2021-03-312020-12-312020-09-302020-06-302019-12-31
Value69106966973
Percentage of OtherEmployeeRelatedLiabilitiesCurrent100.0100.0100.0100.0100.0

us-gaap:OtherPostretirementBenefitsPayableCurrentAndNoncurrent

us-gaap:OtherPostretirementBenefitsPayableCurrentAndNoncurrent


Other
Period End2020-12-312019-12-312018-12-31
Value8400000.07900000.02300000.0
Percentage of OtherPostretirementBenefitsPayableCurrentAndNoncurrent100.0100.0100.0

us-gaap:OtherSundryLiabilitiesCurrent

us-gaap:OtherSundryLiabilitiesCurrent


Other
Period End2020-12-312019-12-312018-12-312017-12-312014-12-312013-12-31
Value211710181616
Percentage of OtherSundryLiabilitiesCurrent100.0100.0100.0100.0100.0100.0

us-gaap:PensionAndOtherPostretirementDefinedBenefitPlansCurrentLiabilities

us-gaap:PensionAndOtherPostretirementDefinedBenefitPlansCurrentLiabilities


Pension
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-312009-12-31
Value2400000.02300000.02200000.02200000.02200000.02200000.02200000.02200000.02300000.02200000.02200000.02300000.02200000.02300000.02300000.02300000.02200000.05700000.05600000.05600000.02500000.02500000.02500000.02600000.02100000.02200000.02200000.02200000.02900000.02800000.02500000.02300000.02300000.02300000.02200000.02200000.02100000.02100000.0
Percentage of PensionAndOtherPostretirementDefinedBenefitPlansCurrentLiabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PensionAndOtherPostretirementDefinedBenefitPlansCurrentLiabilities us-gaap:RetirementPlanType

us-gaap:PensionPlansDefinedBenefit


Pension
Period End2020-12-312019-12-312018-12-312017-12-31
Value1600000.01500000.01600000.01500000.0
Percentage of PensionAndOtherPostretirementDefinedBenefitPlansCurrentLiabilities69.668.269.668.2

us-gaap:PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesCurrentAndNoncurrent us-gaap:RetirementPlanType

us-gaap:PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesCurrentAndNoncurrent

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Pension
Period End2020-12-312019-12-312018-12-312017-12-31
Value6.16.66.07.1
Percentage of PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesCurrentAndNoncurrent100.0100.0100.0100.0

us-gaap:PensionPlansDefinedBenefit


Pension
Period End2020-12-312019-12-312018-12-312017-12-31
Value40435248
Percentage of PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesCurrentAndNoncurrent668.9663.6875.0683.1

us-gaap:RestructuringAndRelatedCostCostIncurredToDate1 us-gaap:RestructuringPlan

us-gaap:RestructuringAndRelatedCostCostIncurredToDate1

wst:A2020RestructuringPlan


Restructuring
Period End2020-07-31
Value4.5
Percentage of RestructuringAndRelatedCostCostIncurredToDate1100.0

wst:The2018RestructuringPlan


Restructuring
Period End2020-12-31
Value13
Percentage of RestructuringAndRelatedCostCostIncurredToDate10.0

wst:The2020RestructuringPlan


Restructuring
Period End2020-12-31
Value4.6
Percentage of RestructuringAndRelatedCostCostIncurredToDate10.0

us-gaap:RestructuringAndRelatedCostExpectedCost1 us-gaap:Range, us-gaap:RestructuringPlan

us-gaap:RestructuringAndRelatedCostExpectedCost1

srt:Maximum, wst:A2020RestructuringPlan


Restructuring
Period End2020-07-31
Value17
Percentage of RestructuringAndRelatedCostExpectedCost1100.0

srt:Maximum, wst:The2020RestructuringPlan


Restructuring
Period End2020-07-31
Value17
Percentage of RestructuringAndRelatedCostExpectedCost1100.0

srt:Minimum, wst:A2020RestructuringPlan


Restructuring
Period End2020-07-31
Value15
Percentage of RestructuringAndRelatedCostExpectedCost188.2

srt:Minimum, wst:The2020RestructuringPlan


Restructuring
Period End2020-07-31
Value15
Percentage of RestructuringAndRelatedCostExpectedCost188.2

us-gaap:RestructuringReserve

us-gaap:RestructuringReserve


Restructuring
Period End2020-12-312019-12-312018-12-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-312013-12-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value7.81.53.32.13.04.24.85.96.25.70.00.02.83.84.65.76.86.79.510
Percentage of RestructuringReserve100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RestructuringReserve us-gaap:RestructuringCostAndReserve, us-gaap:RestructuringPlan

us-gaap:EmployeeSeverance, wst:A2018RestructuringPlan


Restructuring
Period End2020-12-312020-09-302019-12-312018-09-302018-06-302018-03-312017-12-31
Value0.10.21.43.23.22.00.0
Percentage of RestructuringReserve1.30.093.30.00.00.00.0

us-gaap:EmployeeSeverance, wst:A2020RestructuringPlan


Restructuring
Period End2021-03-312020-12-312020-09-30
Value5.14.64.5
Percentage of RestructuringReserve0.059.00.0

us-gaap:EmployeeSeverance, wst:The2018RestructuringPlan


Restructuring
Period End2020-12-312019-12-312018-12-31
Value0.11.42.3
Percentage of RestructuringReserve1.393.369.7

us-gaap:EmployeeSeverance, wst:The2020RestructuringPlan


Restructuring
Period End2020-12-31
Value4.6
Percentage of RestructuringReserve59.0

us-gaap:OtherRestructuring, wst:A2020RestructuringPlan


Restructuring
Period End2021-03-31
Value0.6
Percentage of RestructuringReserve0.0

us-gaap:RestructuringReserve us-gaap:RestructuringPlan

wst:A2018RestructuringPlan


Restructuring
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value0.10.20.40.81.42.51.52.33.23.22.00.0
Percentage of RestructuringReserve1.30.00.00.093.30.00.069.70.00.00.00.0

wst:A2020RestructuringPlan


Restructuring
Period End2021-03-312020-12-312020-09-30
Value5.74.64.5
Percentage of RestructuringReserve0.059.00.0

wst:The2018RestructuringPlan


Restructuring
Period End2020-12-312019-12-312018-12-31
Value0.11.42.3
Percentage of RestructuringReserve1.393.369.7

wst:The2020RestructuringPlan


Restructuring
Period End2020-12-31
Value4.6
Percentage of RestructuringReserve59.0

us-gaap:RetainedEarningsUndistributedEarningsFromEquityMethodInvestees

us-gaap:RetainedEarningsUndistributedEarningsFromEquityMethodInvestees


Retained
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value98827569635146413731
Percentage of RetainedEarningsUndistributedEarningsFromEquityMethodInvestees100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue us-gaap:AwardType

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue

wst:CashSettledPSUAwards


Share
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value130.13150.3379.4892.2525.28
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue100.0100.0100.0100.0100.0

wst:StockSettledPSUAwards


Share
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value116.3766.0376.8464.3854.47
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue89.443.996.769.8215.5

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber


Share
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value1600000.01600000.01700000.01900000.02700000.02600000.02300000.01500000.01800000.01800000.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice


Share
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value62.4253.1245.3235.4427.1720.6719.5138.0232.9127.77
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue


Share
Period End2020-12-31
Value481
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableAggregateIntrinsicValue

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableAggregateIntrinsicValue


Share
Period End2020-12-31
Value351
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableAggregateIntrinsicValue100.0

us-gaap:SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleAmountOfUnrecordedBenefit

us-gaap:SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleAmountOfUnrecordedBenefit


Significant
Period End2020-12-31
Value-300000.0
Percentage of SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleAmountOfUnrecordedBenefit100.0

us-gaap:TaxCreditCarryforwardAmount us-gaap:IncomeTaxAuthority, us-gaap:TaxCreditCarryforward

us-gaap:TaxCreditCarryforwardAmount

us-gaap:StateAndLocalJurisdiction, us-gaap:Research


Tax
Period End2020-12-312019-12-312018-12-312014-12-312013-12-312012-12-31
Value0.92.02.63.33.33.5
Percentage of TaxCreditCarryforwardAmount100.0100.0100.0100.0100.0100.0

us-gaap:TransferOfFinancialAssetsAccountedForAsSalesCashProceedsReceivedForAssetsDerecognizedAmount

us-gaap:TransferOfFinancialAssetsAccountedForAsSalesCashProceedsReceivedForAssetsDerecognizedAmount


Transfer
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value148.94.93.3107.95.51.85.7
Percentage of TransferOfFinancialAssetsAccountedForAsSalesCashProceedsReceivedForAssetsDerecognizedAmount100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:TreasuryStockShares

us-gaap:TreasuryStockShares


Treasury
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value1500000.01300000.01400000.01500000.01700000.01200000.01300000.01800000.01200000.01200000.01800000.01700000.01300000.0800000.0800000.0800000.0600000.0300000.0200000.0100000.0100000.0100000.0100000.0100000.0100000.0100000.0200000.0200000.0100000.0600000.01000000.01300000.0
Percentage of TreasuryStockShares100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:UnamortizedDebtIssuanceExpense

us-gaap:UnamortizedDebtIssuanceExpense


Unamortized
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-31
Value600000.0500000.0700000.0700000.0700000.0700000.0500000.0600000.0600000.0600000.0600000.0700000.0700000.0700000.0800000.0800000.0900000.0900000.0900000.01000000.0
Percentage of UnamortizedDebtIssuanceExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:UnamortizedDebtIssuanceExpense us-gaap:LongtermDebtType

us-gaap:SeniorNotes


Unamortized
Period End2020-12-312019-12-31
Value400000.0500000.0
Percentage of UnamortizedDebtIssuanceExpense80.071.4

us-gaap:UndistributedEarningsOfForeignSubsidiaries

us-gaap:UndistributedEarningsOfForeignSubsidiaries


Undistributed
Period End2020-12-31
Value345
Percentage of UndistributedEarningsOfForeignSubsidiaries100.0

us-gaap:UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued

us-gaap:UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued


Unrecognized
Period End2020-12-312019-12-312018-12-312017-12-312014-12-312013-12-312013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value300000.0200000.0200000.0100000.0600000.0500000.0500000.0500000.0500000.0500000.0500000.0400000.0500000.0500000.0400000.0
Percentage of UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:UnrecordedUnconditionalPurchaseObligationBalanceOnFirstAnniversary

us-gaap:UnrecordedUnconditionalPurchaseObligationBalanceOnFirstAnniversary


Unrecorded
Period End2020-12-31
Value41
Percentage of UnrecordedUnconditionalPurchaseObligationBalanceOnFirstAnniversary100.0

us-gaap:UnrecordedUnconditionalPurchaseObligationBalanceSheetAmount

us-gaap:UnrecordedUnconditionalPurchaseObligationBalanceSheetAmount


Unrecorded
Period End2020-12-31
Value118
Percentage of UnrecordedUnconditionalPurchaseObligationBalanceSheetAmount100.0

us-gaap:ValuationAllowancesAndReservesBalance

us-gaap:ValuationAllowancesAndReservesBalance


Valuation
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value161618211920232420192525
Percentage of ValuationAllowancesAndReservesBalance100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ValuationAllowancesAndReservesBalance us-gaap:ValuationAllowancesAndReservesType

us-gaap:AllowanceForCreditLoss


Valuation
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-31
Value1.10.52.00.50.40.6
Percentage of ValuationAllowancesAndReservesBalance6.83.011.12.32.12.9

us-gaap:ValuationAllowanceOfDeferredTaxAssets


Valuation
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value151516201820222320192424
Percentage of ValuationAllowancesAndReservesBalance93.297.088.997.797.997.196.196.797.698.598.097.2

wst:AccruedSalariesWagesAndBenefitsCurrent

wst:AccruedSalariesWagesAndBenefitsCurrent


Accrued
Period End2020-12-312019-12-312018-12-31
Value1067364
Percentage of AccruedSalariesWagesAndBenefitsCurrent100.0100.0100.0

wst:AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentAndCumulativeChangesInNetGainLossFromCashFlowHedgesEffect us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

wst:AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentAndCumulativeChangesInNetGainLossFromCashFlowHedgesEffect

wst:DaikyoSeikoLtdDaikyo


Accumulated
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value600000.0-400000.0-400000.0-500000.0-5300000.0-4700000.0-4300000.0-800000.0-400000.0-100000.0
Percentage of AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentAndCumulativeChangesInNetGainLossFromCashFlowHedgesEffect100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

wst:AssetsDefinedBenefitPlansNoncurrent us-gaap:RetirementPlanType

wst:AssetsDefinedBenefitPlansNoncurrent

us-gaap:PensionPlansDefinedBenefit


Assets
Period End2020-12-312019-12-31
Value124.3
Percentage of AssetsDefinedBenefitPlansNoncurrent100.0100.0

wst:BusinessCombinationContingentConsiderationMeasurementInput us-gaap:MeasurementInputType

wst:BusinessCombinationContingentConsiderationMeasurementInput

us-gaap:MeasurementInputDiscountRate


Business
Period End2021-03-312020-12-312020-09-302020-06-302020-03-31
Value19.019.019.00.190.19
Percentage of BusinessCombinationContingentConsiderationMeasurementInput100.0100.0100.0100.0100.0

wst:BusinessCombinationContingentConsiderationMeasurementInput us-gaap:Range, us-gaap:MeasurementInputType

srt:Maximum, wst:ProbabilitiesOfSuccessfulExecutionOfAgreement


Business
Period End2021-03-312020-12-312020-09-302020-06-302020-03-31
Value100.0100.0100.01.01.0
Percentage of BusinessCombinationContingentConsiderationMeasurementInput526.3526.3526.3526.3526.3

srt:Maximum, wst:ProbabilitiesOfSuccessfulFDAApproval


Business
Period End2021-03-312020-12-312020-09-302020-06-302020-03-31
Value100.0100.0100.01.01.0
Percentage of BusinessCombinationContingentConsiderationMeasurementInput526.3526.3526.3526.3526.3

srt:Maximum, wst:SalesProjections


Business
Period End2021-03-312020-12-312020-09-302020-06-30
Value50.050.050.00.5
Percentage of BusinessCombinationContingentConsiderationMeasurementInput263.2263.2263.2263.2

srt:Minimum, wst:ProbabilitiesOfSuccessfulExecutionOfAgreement


Business
Period End2021-03-312020-12-312020-09-302020-06-302020-03-31
Value25.025.025.00.150.15
Percentage of BusinessCombinationContingentConsiderationMeasurementInput131.6131.6131.678.978.9

srt:Minimum, wst:ProbabilitiesOfSuccessfulFDAApproval


Business
Period End2021-03-312020-12-312020-09-302020-06-302020-03-31
Value19.019.019.00.130.13
Percentage of BusinessCombinationContingentConsiderationMeasurementInput100.0100.0100.068.468.4

srt:Minimum, wst:SalesProjections


Business
Period End2021-03-312020-12-312020-09-302020-06-30
Value10.010.010.00.1
Percentage of BusinessCombinationContingentConsiderationMeasurementInput52.652.652.652.6

srt:WeightedAverage, wst:SalesProjections


Business
Period End2021-03-312020-12-312020-09-302020-06-30
Value40.040.040.00.4
Percentage of BusinessCombinationContingentConsiderationMeasurementInput210.5210.5210.5210.5

wst:CreditAvailableForIssuanceOfLettersOfCredit us-gaap:LongtermDebtType

wst:CreditAvailableForIssuanceOfLettersOfCredit

wst:RevolvingCreditFacilityDue2024


Credit
Period End2020-12-31
Value30
Percentage of CreditAvailableForIssuanceOfLettersOfCredit100.0

wst:DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsRestructuringAndImpairmentCharges

wst:DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsRestructuringAndImpairmentCharges


Deferred
Period End2020-12-312018-12-312017-12-312014-12-312013-12-312012-12-312011-12-31
Value400000.00100000.00100000.0300000.01700000.0
Percentage of DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsRestructuringAndImpairmentCharges100.00.0100.00.0100.0100.0100.0

wst:DefinedBenefitPlanExpectedFutureBenefitPayments

wst:DefinedBenefitPlanExpectedFutureBenefitPayments


Defined
Period End2020-12-312019-12-312018-12-312014-12-312013-12-312012-12-31
Value168158170279281307
Percentage of DefinedBenefitPlanExpectedFutureBenefitPayments100.0100.0100.0100.0100.0100.0

wst:DefinedBenefitPlanExpectedFutureBenefitPayments us-gaap:RetirementPlanSponsorLocation

country:US


Defined
Period End2020-12-312019-12-31
Value132137
Percentage of DefinedBenefitPlanExpectedFutureBenefitPayments79.086.6

us-gaap:ForeignPlan


Defined
Period End2020-12-312019-12-312018-12-31
Value352129
Percentage of DefinedBenefitPlanExpectedFutureBenefitPayments21.013.417.1

wst:LesseeOperatingLeaseLiabilityToBePaidAfterYearFour

wst:LesseeOperatingLeaseLiabilityToBePaidAfterYearFour


Lessee
Period End2021-03-312020-09-30
Value3742
Percentage of LesseeOperatingLeaseLiabilityToBePaidAfterYearFour100.0100.0

wst:LineOfCreditFacilityAdditionalBorrowingCapacity us-gaap:LongtermDebtType

wst:LineOfCreditFacilityAdditionalBorrowingCapacity

wst:RevolvingCreditFacilityDue2024


Line
Period End2020-12-31
Value350
Percentage of LineOfCreditFacilityAdditionalBorrowingCapacity100.0

wst:NotesPayableAndOtherDebtCurrent

wst:NotesPayableAndOtherDebtCurrent


Notes
Period End2020-12-312019-12-312018-12-31
Value2300000.02300000.0100000.0
Percentage of NotesPayableAndOtherDebtCurrent100.0100.0100.0

wst:ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumEmployeeSubscriptionRateAmount us-gaap:AwardType

wst:ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumEmployeeSubscriptionRateAmount

wst:EmployeeStockPurchasePlanEspp


Share
Period End2020-12-31
Value25000.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumEmployeeSubscriptionRateAmount100.0

wst:ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingWeightedAverageExercisePrice us-gaap:AwardType

wst:ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingWeightedAverageExercisePrice

us-gaap:StockAppreciationRightsSARS


Share
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value75.4352.3646.4838.5531.1327.7925.224.0341.6140.3439.7438.04
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingWeightedAverageExercisePrice100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

wst:ShareBasedCompensationArrangementsByShareBasedPaymentAwardNonOptionEquityInstrumentsExercisableWeightedAverageExercisePrice us-gaap:AwardType

wst:ShareBasedCompensationArrangementsByShareBasedPaymentAwardNonOptionEquityInstrumentsExercisableWeightedAverageExercisePrice

us-gaap:StockAppreciationRightsSARS


Share
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value40.2340.7336.9130.7726.6523.1520.9541.439.7239.16
Percentage of ShareBasedCompensationArrangementsByShareBasedPaymentAwardNonOptionEquityInstrumentsExercisableWeightedAverageExercisePrice100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Line plots across dimensions of each concept


us-gaap:SharesIssued
us-gaap:StatementEquityComponents
(None,)
Shares Issuedus-gaap: Statement Equity Components
Operating Margin
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
('us-gaap:OperatingSegments', None)
Operating  Marginus-gaap: Consolidation Items, us-gaap: Statement Business Segments
TTM Greenblatt ROC
_
(None,)
T T M  Greenblatt  R O C_
us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents
('us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome', None)
Income Loss From Continuing Operations 
Before Income Taxes Minority Interest And Income Loss From Equity Method Investmentsus-gaap: Reclassification Out Of Accumulated Other Comprehensive Income, us-gaap: Statement Equity Components
us-gaap:IncomeTaxExpenseBenefit
us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents
('us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome', None)
Income Tax Expense Benefitus-gaap: Reclassification Out Of Accumulated Other Comprehensive Income, us-gaap: Statement Equity Components
us-gaap:NetIncomeLoss
us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents
('us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome', None)
Net Income Lossus-gaap: Reclassification Out Of Accumulated Other Comprehensive Income, us-gaap: Statement Equity Components
us-gaap:OperatingIncomeLoss
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
('us-gaap:OperatingSegments', None)
Operating Income Lossus-gaap: Consolidation Items, us-gaap: Statement Business Segments
us-gaap:OperatingIncomeLoss
us-gaap:ConsolidationItems
(None,)
Operating Income Lossus-gaap: Consolidation Items
us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
('us-gaap:OperatingSegments', None)
Revenue From Contract With Customer Excluding Assessed Taxus-gaap: Consolidation Items, us-gaap: Statement Business Segments
us-gaap:Revenues
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
('us-gaap:OperatingSegments', None)
Revenuesus-gaap: Consolidation Items, us-gaap: Statement Business Segments
us-gaap:Assets
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
('us-gaap:OperatingSegments', None)
Assetsus-gaap: Consolidation Items, us-gaap: Statement Business Segments
us-gaap:StockholdersEquity
us-gaap:StatementEquityComponents
(None,)
Stockholders Equityus-gaap: Statement Equity Components
us-gaap:NoncurrentAssets
us-gaap:StatementGeographical
(None,)
Noncurrent Assetsus-gaap: Statement Geographical
us-gaap:PropertyPlantAndEquipmentGross
us-gaap:PropertyPlantAndEquipmentByType
(None,)
Property Plant And Equipment Grossus-gaap: Property Plant And Equipment By Type
us-gaap:Goodwill
us-gaap:StatementBusinessSegments
(None,)
Goodwillus-gaap: Statement Business Segments
us-gaap:FiniteLivedIntangibleAssetsNet
us-gaap:FiniteLivedIntangibleAssetsByMajorClass
(None,)
Finite Lived Intangible Assets Netus-gaap: Finite Lived Intangible Assets By Major Class
us-gaap:PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent
us-gaap:RetirementPlanType
(None,)
Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrentus-gaap: Retirement Plan Type
us-gaap:StockholdersEquity
us-gaap:StatementEquityComponents
(None,)
Stockholders Equityus-gaap: Statement Equity Components
us-gaap:NetIncomeLoss
us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents
('us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome', None)
Net Income Lossus-gaap: Reclassification Out Of Accumulated Other Comprehensive Income, us-gaap: Statement Equity Components