CDW


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: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:GrossProfit

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest

us-gaap:IncomeTaxExpenseBenefit

us-gaap:IncomeTaxesPaidNet

us-gaap:InterestIncomeExpenseNet

us-gaap:InterestPaidNet

us-gaap:NetIncomeLoss
us-gaap:StatementEquityComponents

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

us-gaap:OtherNonoperatingIncomeExpense

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax
cdw:Public, us-gaap:StatementBusinessSegments
us-gaap:ConsolidationItems, us-gaap:ContractWithCustomerSalesChannel, us-gaap:StatementBusinessSegments
us-gaap:ConsolidationItems, us-gaap:ProductOrService, us-gaap:StatementBusinessSegments
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments, us-gaap:TimingOfTransferOfGoodOrService
us-gaap:ConsolidationItems, us-gaap:StatementGeographical, us-gaap:StatementBusinessSegments
us-gaap:ContractWithCustomerSalesChannel
us-gaap:ContractWithCustomerSalesChannel, us-gaap:StatementBusinessSegments
us-gaap:ProductOrService
us-gaap:ProductOrService, us-gaap:StatementBusinessSegments
us-gaap:StatementBusinessSegments
us-gaap:StatementBusinessSegments, us-gaap:TimingOfTransferOfGoodOrService
us-gaap:StatementGeographical
us-gaap:StatementGeographical, us-gaap:StatementBusinessSegments
us-gaap:TimingOfTransferOfGoodOrService

us-gaap:Revenues

us-gaap:SellingGeneralAndAdministrativeExpense

us-gaap:Assets

us-gaap:LiabilitiesAndStockholdersEquity

us-gaap:StockholdersEquity
us-gaap:CumulativeEffectPeriodOfAdoption
us-gaap:CumulativeEffectPeriodOfAdoption, us-gaap:StatementEquityComponents
us-gaap:StatementEquityComponents

us-gaap:AssetsCurrent

us-gaap:CashAndCashEquivalentsAtCarryingValue

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents

us-gaap:AccountsReceivableNetCurrent

us-gaap:InventoryNet

us-gaap:PrepaidExpenseAndOtherAssetsCurrent

us-gaap:MachineryAndEquipmentGross

us-gaap:PropertyPlantAndEquipmentGross

us-gaap:FurnitureAndFixturesGross

us-gaap:ConstructionInProgressGross

us-gaap:PropertyPlantAndEquipmentNet

us-gaap:Goodwill
us-gaap:StatementBusinessSegments

us-gaap:IntangibleAssetsNetExcludingGoodwill

us-gaap:FiniteLivedIntangibleAssetsNet
us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:OperatingLeaseRightOfUseAsset

us-gaap:OtherAssetsNoncurrent

us-gaap:AccruedIncomeTaxesCurrent

us-gaap:ContractWithCustomerLiabilityCurrent

us-gaap:LiabilitiesCurrent

us-gaap:LongTermDebtCurrent

us-gaap:OperatingLeaseLiabilityCurrent

us-gaap:OtherAccruedLiabilitiesCurrent

us-gaap:OtherLiabilitiesCurrent

us-gaap:LiabilitiesNoncurrent

us-gaap:LongTermDebtNoncurrent

us-gaap:DeferredIncomeTaxLiabilitiesNet

us-gaap:OtherLiabilitiesNoncurrent

us-gaap:OperatingLeaseLiabilityNoncurrent

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive

us-gaap:OperatingLeaseLiability

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue

us-gaap:LesseeOperatingLeaseLiabilityUndiscountedExcessAmount

us-gaap:StockholdersEquity
us-gaap:CumulativeEffectPeriodOfAdoption
us-gaap:CumulativeEffectPeriodOfAdoption, us-gaap:StatementEquityComponents
us-gaap:StatementEquityComponents

us-gaap:CommonStockValue

us-gaap:AdditionalPaidInCapitalCommonStock

us-gaap:RetainedEarningsAccumulatedDeficit
us-gaap:StatementScenario, us-gaap:AdjustmentsForNewAccountingPronouncements

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
us-gaap:StatementEquityComponents

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect

us-gaap:DepreciationDepletionAndAmortization
us-gaap:ConsolidationItems
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:IncreaseDecreaseInAccountsReceivable

us-gaap:IncreaseDecreaseInInventories

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetIncomeLoss
us-gaap:StatementEquityComponents

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:PaymentsToAcquirePropertyPlantAndEquipment

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:ProceedsFromIssuanceOfLongTermDebt

us-gaap:RepaymentsOfLongTermDebt

us-gaap:PaymentsOfDividendsCommonStock

us-gaap:PaymentsForRepurchaseOfCommonStock
us-gaap:DebtInstrument, us-gaap:LongtermDebtType
us-gaap:DebtInstrumentInterestRateStatedPercentage
us-gaap:LongtermDebtType

us-gaap:EffectiveIncomeTaxRateContinuingOperations

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice

us-gaap:DeferredTaxLiabilities

us-gaap:UnrecognizedTaxBenefits

us-gaap:DeferredTaxAssetsValuationAllowance

cdw:NetChangeInAccountsPayableInventoryFinancing

cdw:RevenuenetbyProductandServicePercentage
us-gaap:ProductOrService

us-gaap:AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation
us-gaap:StatementEquityComponents

us-gaap:AdvertisingExpense
us-gaap:DerivativeInstrumentRisk
us-gaap:CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths

us-gaap:CommonStockDividendsPerShareCashPaid

us-gaap:ContractWithCustomerLiabilityRevenueRecognized
us-gaap:LongtermDebtType
us-gaap:DebtInstrumentPeriodicPaymentPrincipal
us-gaap:LongtermDebtType
us-gaap:DebtInstrumentRedemptionPricePercentageOfPrincipalAmountRedeemed

us-gaap:DepreciationAmortizationAndAccretionNet

us-gaap:DividendsCommonStock
us-gaap:StatementEquityComponents

us-gaap:EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents

us-gaap:EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
us-gaap:BusinessAcquisition
us-gaap:GoodwillAcquiredDuringPeriod
us-gaap:BusinessAcquisition, us-gaap:StatementBusinessSegments

us-gaap:GoodwillForeignCurrencyTranslationGainLoss
us-gaap:StatementBusinessSegments

us-gaap:IncreaseDecreaseInAccountsPayableTrade

us-gaap:IncreaseDecreaseInDeferredIncomeTaxes

us-gaap:IncreaseDecreaseInOtherOperatingAssets

us-gaap:IncreaseDecreaseInOtherOperatingLiabilities
us-gaap:DerivativeInstrumentRisk
us-gaap:InterestRateCashFlowHedgeGainLossReclassifiedToEarningsNet

us-gaap:OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent

us-gaap:OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent
us-gaap:StatementEquityComponents

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax
us-gaap:DerivativeInstrumentRisk
us-gaap:StatementEquityComponents

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax
us-gaap:StatementEquityComponents

us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent

us-gaap:OtherOperatingActivitiesCashFlowStatement

us-gaap:PaymentsOfDebtExtinguishmentCosts

us-gaap:PaymentsRelatedToTaxWithholdingForShareBasedCompensation

us-gaap:PaymentsToAcquireBusinessesNetOfCashAcquired

us-gaap:ProceedsFromLinesOfCredit

us-gaap:ProceedsFromPaymentsForOtherFinancingActivities

us-gaap:ProceedsFromStockOptionsExercised

us-gaap:ProvisionForDoubtfulAccounts

us-gaap:RepaymentsOfLinesOfCredit
us-gaap:StatementEquityComponents
us-gaap:StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans
us-gaap:StatementEquityComponents
us-gaap:StockIssuedDuringPeriodSharesStockOptionsExercised

us-gaap:StockIssuedDuringPeriodValueEmployeeStockPurchasePlan
us-gaap:StatementEquityComponents

us-gaap:StockIssuedDuringPeriodValueStockOptionsExercised
us-gaap:StatementEquityComponents
us-gaap:StatementEquityComponents
us-gaap:StockRepurchasedAndRetiredDuringPeriodShares

us-gaap:StockRepurchasedAndRetiredDuringPeriodValue
us-gaap:StatementEquityComponents

us-gaap:WeightedAverageNumberDilutedSharesOutstandingAdjustment

cdw:AccountsPayableInventoryFinancing
cdw:InventoryFinancingAgreements
cdw:InventoryFinancingAgreements, us-gaap:LongtermDebtType
cdw:AmountOwedUnderRevolvingLoanFinancingAgreement

cdw:DeferredTaxAssetsRent

cdw:DeferredTaxLiabilitiesForeignInvestments

cdw:DeferredTaxLiabilitiesOperatingLeaseRightOfUseAssets
us-gaap:ValuationTechnique
cdw:FairValueApproachWeightedAveragePercentage
us-gaap:LongtermDebtType
cdw:LineOfCreditFacilityBorrowingBase

cdw:LongtermDebtCurrentMaturitiesGross

cdw:LongtermDebtExcludingCurrentMaturitiesNetofDeferredFinancingCostsDiscountorPremium
cdw:InventoryFinancingAgreements
cdw:OtherInventoryFinancingAgreements
cdw:InventoryFinancingAgreements
cdw:RevolvingLoanFinancingAgreement
us-gaap:IncomeTaxAuthority
cdw:UnrecognizedTaxBenefitsthatWouldImpactEffectiveTaxRateNetofTaxRate

dei:EntityCommonStockSharesOutstanding

us-gaap:AccountsPayableTradeCurrent

us-gaap:AccruedAdvertisingCurrent

us-gaap:AllowanceForDoubtfulAccountsReceivable

us-gaap:AllowanceForDoubtfulAccountsReceivableCurrent
us-gaap:LongtermDebtType
us-gaap:AmountOfRestrictedNetAssetsForConsolidatedAndUnconsolidatedSubsidiaries

us-gaap:BuildingsAndImprovementsGross
us-gaap:BusinessAcquisition
us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill

us-gaap:CapitalizedComputerSoftwareGross

us-gaap:ContractWithCustomerLiability

us-gaap:DebtInstrumentCarryingAmount
us-gaap:LongtermDebtType
us-gaap:DebtInstrument, us-gaap:LongtermDebtType
us-gaap:DebtInstrumentFaceAmount
us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:DebtInstrumentFairValue

us-gaap:DebtLongtermAndShorttermCombinedAmount

us-gaap:DeferredFinanceCostsNet

us-gaap:DeferredIncomeTaxLiabilities

us-gaap:DeferredTaxAssetsGross

us-gaap:DeferredTaxAssetsOperatingLossCarryforwards

us-gaap:DeferredTaxAssetsOther

us-gaap:DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits

us-gaap:DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost

us-gaap:DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts

us-gaap:DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsPolicyholderLiabilities

us-gaap:DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets

us-gaap:DeferredTaxLiabilitiesOther

us-gaap:DeferredTaxLiabilitiesPropertyPlantAndEquipment

us-gaap:DerivativeAssets
us-gaap:DerivativeInstrumentRisk
us-gaap:DerivativeNotionalAmount

us-gaap:EmployeeRelatedLiabilitiesCurrent

us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized

us-gaap:FiniteLivedIntangibleAssetsAccumulatedAmortization
us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearFive

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearFour

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearThree

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo

us-gaap:FiniteLivedIntangibleAssetsGross
us-gaap:FiniteLivedIntangibleAssetsByMajorClass
us-gaap:StatementBusinessSegments
us-gaap:GoodwillImpairedAccumulatedImpairmentLoss

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths
us-gaap:LongtermDebtType
us-gaap:LettersOfCreditOutstandingAmount
us-gaap:DebtInstrument, us-gaap:LongtermDebtType
us-gaap:LineOfCreditFacilityMaximumBorrowingCapacity
us-gaap:LongtermDebtType
us-gaap:LongtermDebtType
us-gaap:LineOfCreditFacilityRemainingBorrowingCapacity

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo
us-gaap:LongtermDebtType
us-gaap:LongtermDebtWeightedAverageInterestRate

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

us-gaap:OtherReceivablesNetCurrent

us-gaap:PropertyPlantAndEquipmentOther

us-gaap:PropertyPlantAndEquipmentOwnedAccumulatedDepreciation

us-gaap:RevenueRemainingPerformanceObligation

us-gaap:SalesAndExciseTaxPayableCurrent
us-gaap:AwardType
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice

us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1

us-gaap:StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1
us-gaap:IncomeTaxAuthority
us-gaap:TaxCreditCarryforwardAmount
us-gaap:ValuationAllowancesAndReservesType
us-gaap:ValuationAllowancesAndReservesBalance

Plots across concepts


IncomeStatement
Net Income Loss
Expenses
Allocated Share Based Compensation Expense
Balance Sheet
Operating Lease Right Of Use Asset
Assets
Derivative Assets
Current Assets
Prepaid Expense And 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
Retained Earnings Accumulated Deficit
Per Share
Common Stock Dividends Per Share Cash Paid
CashFlow
Net Cash Provided By Used In Financing Activities
NetCashProvidedByUsedInOperatingActivities
Net Cash Provided By Used In Operating Activities
NetCashProvidedByUsedInInvestingActivities
Payments To Acquire Businesses Net Of Cash Acquired
NetCashProvidedByUsedInFinancingActivities
Net Cash Provided By Used In Financing Activities
Shares
Common Stock Shares Outstanding
DividendsAndRepurchase
Dividends Common Stock
OperatingLeaseLiability
Operating Lease Liability Current
LesseeOperatingLeaseLiabilityPaymentsDue
Lessee Operating Lease Liability Payments Due Year Four
FiniteLivedIntangibleAssets
Finite Lived Intangible Assets Net
AccountsReceivable
Allowance For Doubtful Accounts Receivable Current

Tables

  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
us-gaap:CommonStockValue ▁▁▁▁▁▁▁▁▃▃▃▃▃▃▃▃▃▆▆▆▆███████████▁1.41.41.41.41.41.41.41.41.51.51.51.51.51.51.51.51.51.61.61.61.61.71.71.71.71.71.71.71.71.71.71.71.4NA1.4NANANA1.4NANANANANANA
 us-gaap:SharesIssued us-gaap:StatementEquityComponents us-gaap:CommonStock▁▂▃▃▃▃▃▄▄▅▅▇▇▇█138.3140.4141.9142.8142.6142.3143.0143.9145.0146.3147.7150.9151.5151.9153.1NANANA160.3NANANA168.2NANANA172.2NANANA172.0NANANANANANANANANANANANANANA
us-gaap:CommonStockSharesOutstanding ▁▁▂▂▂▂▂▂▂▃▃▄▄▄▄▄▅▅▆▆▆▇▇▇████████▂138.3140.4141.9142.8142.6142.3143.0143.9145.0146.3147.7150.9151.5151.9153.0152.9155.6158.0160.3160.5163.2165.5168.2169.2170.1172.5172.2172.0172.0172.0172.0172.0145.2NA145.1NANANA144.8NANANANANANA
us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding ▁█141.7143.1NA144.8144.3144.9NA147.2148.3149.2NA153.7153.9154.8NA156.2159.0162.8NA164.9166.7168.9NA171.0172.5173.5NA173.0172.7172.3NA166.8146.7146.1NA145.9145.8NANANANANANANANA
us-gaap:WeightedAverageNumberOfSharesOutstandingBasic ▁█139.8141.1NA142.7142.4142.7NA144.5145.7147.0NA150.9151.6152.2NA153.8156.0159.4NA162.1164.9167.3NA169.6171.0172.1NA170.9170.2169.6NA166.8145.3145.2NA145.1145.1NANANANANANANANA
us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount ▄▄0.10.1NA0.10.10.1NA0.10.20.1NA0.20.21.0NA1.01.00.4NA0.10.10.4NA0.10.90.4NA0.00.00.1NA6.30.00.0NA0.00.0NANANANANANANANA
us-gaap:EarningsPerShareBasic █▇▇▆▆▅▆▆▆▅▅▅▅▄▆▄▄▂▃▄▄▃▃▄▃▂▂▂▃▂▂▁▂▂▂▂▂▁1.961.651.671.361.321.181.291.391.351.041.071.221.140.831.280.840.90.360.640.780.710.470.530.890.630.320.30.330.510.30.35-0.010.320.190.230.260.250.08NANANANANANANA
us-gaap:EarningsPerShareDiluted █▇▇▆▆▅▆▆▆▅▅▅▅▄▆▄▄▂▃▄▄▃▃▄▃▂▂▂▃▂▂▁▂▂▂▂▂▁1.931.631.651.331.311.161.271.371.331.021.051.21.120.821.260.830.890.350.630.760.70.460.520.880.630.320.30.320.50.30.35-0.010.320.190.230.260.250.07NANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
 Operating Margin us-gaap:ConsolidationItems,us-gaap:StatementBusinessSegments us-gaap:OperatingSegments,cdw:CorporateSegmentPrivateSectorBusiness█▆▅▄▃▇█▇▇▅▆▄▅▃▃▂▃▁1983.31805.61717.51660.01557.51911.01965.41913.51883.91736.21836.41706.51733.81565.81599.31552.81580.11440.6NANANANANANANANANANANANANANANANANANANANANANANANANANANA
 Operating Margin us-gaap:ConsolidationItems,us-gaap:StatementBusinessSegments us-gaap:OperatingSegments,cdw:PublicSegmentGovernmentAgenciesEducationandHealthcare▇▆██▆▃▄▇▅▂▃▅▄▁▃▄▄▁2080.71921.72296.52293.82022.11525.31593.12100.91840.11330.71414.21875.11635.41230.01426.11693.91632.81153.7NANANANANANANANANANANANANANANANANANANANANANANANANANANA
 Operating Margin us-gaap:ConsolidationItems,us-gaap:StatementBusinessSegments us-gaap:OperatingSegments,cdw:SmallBusiness█▆▄▃▁▅▅▄▄▃▄▃▂▂▂▁▂▁482.9432.7366.5000000000001337.0302.1391.5391.1386.2377.4355.6362.5340.0329.5327.6308.1305.4315.0292.0NANANANANANANANANANANANANANANANANANANANANANANANANANANA
 Operating Margin us-gaap:ConsolidationItems,us-gaap:StatementBusinessSegments us-gaap:OperatingSegments,us-gaap:AllOtherSegments▆█▆▃▄▅▆▄▅▅▃▃▄▄▂▁▁▁599.5677.5575.6999999999998465.6484.0561.4587.3507.1528.5535.4461.7451.6487.4483.0418.6381.1363.8369.7NANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
 TTM Greenblatt ROC _ _█▇▇▇▆▅▆▇▆▄▅▆▅▄▄▅▅▃▄▅▄▃▃▄▄▃▃▃▃▂▂▁▃▂▂▂▂▁▁▂▂▁369.9323.4332.2317.8283.4245.8283.8320.6300.3228.9242.9274.8265.5204.1221.6243.7231.1169.8197.2237.5223.5161.0179.9204.6205.9151.6164.3184.7188.2135.8142.092.9153.6120.1130.9139.7136.4103.6111.1139.7128.291.7NANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
us-gaap:AllocatedShareBasedCompensationExpense ▄▄▄▃▂▂▃▃▃▃▃▃▃▂▂▂▃▃▃▂▂▂▃▂▂▂▂▁▁▁▁█▁▁20.615.816.511.65.68.810.812.812.212.710.810.811.08.110.110.011.512.111.110.09.78.411.27.87.54.74.93.94.33.32.340.32.11.9NANANANANANANANANANANA
us-gaap:ComprehensiveIncomeNetOfTax █▇█▇▆▅▇▆▆▅▅▆▅▅▆▅▅▃▄▄▄▃▃▅▄▃▃▃▄▃▃▂▃▂▂▃▃▂▂▂▁▂280.0239.3273.2214.1196.8126.4221.9187.0184.7156.0136.9180.6146.4144.4201.0143.4158.763.779.4114.082.570.073.5128.5112.943.746.950.490.347.057.0-0.243.425.932.441.135.212.821.330.0-34.30.2NANANA
us-gaap:CostOfGoodsAndServicesSold █▇▇▇▆▆▇█▇▅▆▆▆▄▅▆▅▄▄▅▅▃▄▄▄▂▃▄▃▂▂▃▃▂▂▂▂▁▂▂▂▁▁▂▁4263.64042.34075.33930.93618.53632.73759.44091.23856.13285.83381.03659.63490.53002.53224.23391.93353.32772.12914.53093.93054.12592.22860.82933.92779.52298.72558.22758.82609.12227.12265.02405.92327.72009.72175.62190.62157.81934.62066.02160.62010.31779.21912.72006.01863.4
us-gaap:GrossProfit █▇█▇▆▆▇▇▇▅▆▆▆▄▄▅▅▄▄▄▄▃▄▄▃▂▃▃▃▂▂▂▂▂▂▂▂▁▂▂▂▁▁▁▁882.8795.2880.9825.5747.2756.5777.5816.5773.8672.1693.8713.6695.6603.9614.4642.0641.1552.6577.9614.3610.5524.5557.6567.2534.5456.5491.9507.3496.9425.2448.3458.4451.6402.0425.4432.7426.9384.6412.3420.8401.8350.4356.7368.4359.9
us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest █▇▇▆▆▅▆▆▆▅▅▆▆▅▅▅▅▃▅▅▅▄▄▆▅▃▃▃▄▃▃▂▃▃▃▃▃▂▂▃▁▂▁▂▂371.2288.9295.0250.1245.4211.8236.0260.9261.2191.6206.6238.4229.8165.7184.6206.6195.573.6162.8198.2187.5123.9141.7246.2172.187.080.189.5137.280.882.6-4.873.244.548.163.259.715.129.954.7-53.2-3.1-29.3-0.3-10.9
us-gaap:IncomeTaxExpenseBenefit █▆▆▆▆▅▅▆▆▄▅▅▆▄▁▇▅▃▆▆▆▅▅█▆▄▄▄▅▄▃▂▄▃▃▄▄▂▃▃▁▂▂▂▂97.156.356.756.956.343.950.459.264.638.747.354.756.839.0-10.677.454.516.059.672.370.046.152.495.363.932.328.333.950.629.922.6-2.626.516.214.825.222.94.210.917.6-18.41.1-5.2-0.1-3.9
us-gaap:IncomeTaxesPaidNet ▇▃▄█▃▃▄▅▆▃▄▅▆▃▆▅▅▂▅▆▆▂▅▅▆▂▄▅▆▃▃▃▄▂▄▄▃▂▃▂▂▁▃▃147.510.149.2174.911.69.969.287.8103.811.460.782.1107.810.6106.173.190.26.394.7101.8125.96.882.294.6119.14.351.378.0102.49.518.213.449.21.741.343.538.10.320.9-6.81.4-36.415.421.4NA
us-gaap:InterestIncomeExpenseNet ▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▂▁▁▁▁▁▇▇▇█▇███-35.5-35.6-37.1-40.2-39.7-37.9-38.3-42.3-40.5-38.3-37.1-36.6-37.2-37.7-37.1-37.8-35.9-39.7-33.9-37.6-36.9-38.1-38.4-38.537.844.848.650.148.550.151.556.2NANANANANANANANANANANANANA
us-gaap:InterestPaidNet ▃▁▃▁▂▂▂▃▂▂▂▂▂▂▂▂▂▃▂▂▂▂▂▂▂▃▄▂▄▁▅▂▇▁▇▁▇▁▇▁█▂█▂47.2000000000000119.248.923.338.628.629.448.831.944.131.442.931.842.729.941.828.448.426.944.428.944.129.244.128.253.168.627.483.716.198.126.8126.516.2137.114.2135.116.3136.318.4150.527.7155.344.3NA
us-gaap:NetIncomeLoss █▇▇▆▆▆▆▆▆▅▅▆▆▅▆▅▅▃▄▅▄▄▄▅▄▃▃▃▄▃▃▂▃▂▃▃▃▂▂▃▁▂▁▂▂274.1232.6238.3193.2189.1167.9185.6201.7196.6152.9159.3183.7173.0127.0195.2129.2141.057.6103.2125.9117.577.889.3150.9108.254.751.855.686.650.960.0-2.246.728.333.338.036.810.919.037.1-34.8-4.2-24.1-0.3-7.0
us-gaap:OperatingIncomeLoss █▇▇▇▆▅▆▇▆▅▅▆▅▄▄▅▅▃▄▅▄▃▃▄▄▃▃▄▄▂▂▁▃▂▂▂▂▂▂▂▂▁▁▂▁369.9323.4332.2317.8283.4245.8283.8320.6300.3228.9242.9274.8265.5204.1221.6243.7231.1169.8197.2237.5223.5161.0179.9204.6205.9151.6164.3184.7188.2135.8142.092.9153.6120.1130.9139.7136.4103.6111.1139.7128.291.781.2104.695.6
us-gaap:OtherNonoperatingIncomeExpense █▄▄▁▄▄▃▂▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▂▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄36.81.1-0.1-27.51.73.9-9.5-17.41.41.00.80.21.5-0.70.20.70.30.9-0.50.40.91.00.2-18.04.04.51.30.70.10.50.6-0.20.20.4-0.10.20.2-0.2-0.30.50.00.5-0.10.2-0.1
us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax █▇█▇▆▆▇▇▇▅▆▆▆▄▅▅▅▄▄▅▅▃▄▄▄▂▃▄▃▂▂▃▃▂▂▂▂▁▂▂▂▁▁▂▁5146.44837.54956.24756.44365.74389.24536.94907.74629.93957.94074.84373.24186.13606.43752.13933.23891.73256.03492.43708.23664.63116.73418.43501.13314.02755.23050.13266.13106.02652.32713.32864.32779.32411.72601.02623.32584.72319.22479.32581.42412.12129.62269.42374.42223.3
us-gaap:Revenues █▇█▇▆▆▇▇▇▅▆▆▆▄▅▅▅▄▄▅▅▃▄▄▄▂▃▄▃▂▂▃▃▂▂▂▂▁▂▂▂▁▁▂▁5146.44837.54956.24756.44365.74389.24536.94907.74629.93957.94074.84373.24186.13606.43752.13933.23891.73256.03492.43708.23664.63116.73418.43501.13314.02755.23050.13266.13106.02652.32713.32864.32779.32411.72601.02623.32584.72319.22479.32581.42412.12129.62269.42374.42223.3
us-gaap:SellingGeneralAndAdministrativeExpense ▇▆█▇▆▇▆▆▅▅▅▅▄▄▄▄▄▄▃▃▄▃▃▃▂▂▂▂▂▂▂▃▂▁▂▂▂▁▂▂▁▁▁▁▁512.9471.8548.7507.7463.8510.7443.8444.9420.4404.0402.3390.7381.4362.7347.2352.0363.5347.4336.1334.9344.7329.3338.5321.4290.6275.5290.1285.4273.9260.9270.6332.4266.4251.5261.4257.0259.5251.6266.4252.8244.4229.3242.4235.8239.6
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
us-gaap:Assets ▇▇██▇▆▅▅▅▅▄▄▄▄▃▄▄▃▃▃▃▃▃▃▂▂▂▂▂▁▁▂▂▁▁▂▁▁▁▂▂8990.99053.59344.79223.78749.58222.47999.47703.17921.97679.57167.77375.47330.17027.96956.67101.87041.66774.76948.46772.86887.96717.96755.36741.56251.26088.66099.96107.46045.35912.55924.66038.86020.55822.75700.15985.15935.55721.45949.65965.06021.9NA5943.8NANA
us-gaap:LiabilitiesAndStockholdersEquity ▇▇██▇▆▅▅▅▅▄▄▄▄▃▄▄▃▃▃▃▃▃▃▂▂▂▂▂▁▁▂▂▁▁▂▁▁▁▂▂8990.99053.59344.79223.78749.58222.47999.47703.17921.97679.57167.77375.47330.17027.96956.67101.87041.66774.76948.46772.86887.96717.96755.36741.56251.26088.66099.96107.46045.35912.55924.66038.86020.55822.75700.15985.15935.55721.45949.65965.06021.9NA5943.8NANA
us-gaap:StockholdersEquity ▇▇██▇▆▆▆▆▆▆▇▇▆▆▅▆▆▇▆▇▇▇▇▆▆▆▆▆▅▅▅▂▂▂▂▂▁▁▁▁1048.81170.31297.11238.51055.6889.7960.3935.1936.1927.3975.21160.71068.9996.9982.9806.5849.1907.31045.5990.51013.41039.91095.91075.7995.8975.5936.5894.0844.8754.8711.7659.8209.0163.8136.598.251.110.6-7.3-35.5-69.3NA-43.5NANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
us-gaap:AssetsCurrent ▇▇██▇▆▅▅▅▅▄▅▅▄▄▄▄▃▄▃▃▃▃▃▃▂▂▂▂▂▂▂▂▁▁▂▁▁▁▁▁5421.65469.85953.55759.65235.84665.84334.14295.34425.34132.53796.83949.53844.73479.93378.13492.53396.73097.63238.12997.83075.32816.32790.82734.92714.42485.92453.42516.22415.32247.92213.52285.72233.71986.11814.82060.01964.31701.31879.41862.11866.8NA1702.3NANA
us-gaap:CashAndCashEquivalentsAtCarryingValue ▃▅█▇▆▂▂▂▂▂▂▂▁▂▂▁▁▂▂▁▂▂▁▁▃▃▃▃▂▂▂▃▂▂▁▂▂▁▁▁▁▁▁▁▁501.2878.61410.21249.5958.4214.4154.0166.9194.5285.0205.8255.1100.7221.0144.297.979.0251.7263.7118.3129.4248.237.697.5335.7447.4344.5357.8227.6306.7188.1350.2179.3147.137.9193.0158.736.599.925.944.673.736.667.026.1
us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents ▃▅█▇▆▂▁▁▂▂▂▂▁▂▁501.2878.61410.21249.5958.4214.4154.0166.9194.5290.7205.8255.1100.7221.0144.2NANANA263.7NANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:AccountsReceivableNetCurrent ████▇▇▇▇▇▆▆▆▆▅▅▅▅▄▄▄▄▃▄▃▃▂▂▂▂▂▂▂▂▂▂▂▁▁▁▂▁3370.53234.13212.63267.73029.03149.43002.22899.52967.32725.12671.22650.52612.22274.02320.52311.32335.31985.82168.62019.82082.51780.22017.41860.01712.51448.91561.11473.21526.11335.01451.01310.61390.51264.51265.11277.21238.31093.61254.91257.01178.3NA1091.5NANA
us-gaap:InventoryNet █▆▆▅▆▅▅▅▅▄▃▃▄▃▃▄▃▃▃▃▃▃▂▂▂▂▁▂▃▂▂▁▂▂▁▁▁▁▁▁▁888.7745.1760.0648.1694.8672.1611.2603.6652.2590.7454.3481.1576.9485.8449.5549.0513.6493.4452.0451.6487.3460.4393.1411.4436.2357.0337.5423.5449.6388.4382.0353.8378.5358.4314.6346.9321.6346.8321.7315.1348.9NA292.8NANA
us-gaap:PrepaidExpenseAndOtherAssetsCurrent █▇▇▇▇▆▆▇▇▆▅▇▆▇▄▅▄▄▄▅▄▄▅▅▁▂▂▃▂▂▁▂▄▂▁▂▂▁▁▂▂230.3215.4191.2190.2199.7187.4171.6193.1205.3178.3149.1192.4181.1188.9127.4153.5131.0127.3118.9138.7115.8114.8144.3135.441.358.554.786.352.453.346.163.1108.251.534.651.263.545.034.748.756.7NA35.8NANA
us-gaap:MachineryAndEquipmentGross NANA43.3NANANA45.4NANANA44.1NANANA45.6NANANA43.2NANANA56.8NANANA54.3NANANA53.0NANANA50.9NANANA48.3NANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
us-gaap:PropertyPlantAndEquipmentGross NANA419.2NANANA620.2NANANA371.9NANANA362.9NANANA348.0NANANA374.4NANANA309.7NANANA310.1NANANA302.7NANANA294.3NANANANANANA
us-gaap:FurnitureAndFixturesGross NANA21.2NANANA20.5NANANA18.9NANANA22.7NANANA23.8NANANA29.4NANANA21.7NANANA21.6NANANA21.6NANANA20.3NANANANANANA
us-gaap:ConstructionInProgressGross NANA50.8NANANA23.3NANANA24.5NANANA17.9NANANA20.4NANANA23.9NANANA24.7NANANA10.9NANANA11.9NANANA17.0NANANANANANA
us-gaap:PropertyPlantAndEquipmentNet ▂▂▂▅▇▇█▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▁▁▁▁▁▁▁▁▁▁▁▁▁▁▂▂▂176.1175.5175.5268.0326.5331.9363.1171.1163.4155.2156.1147.8150.3153.1161.1162.5160.7162.4163.7162.5163.8168.4175.4154.4134.2135.1137.2131.7129.8129.9131.1129.6132.7134.0142.7139.3142.3146.1154.3147.9150.8NA158.1NANA
us-gaap:Goodwill ▇█▅▅▅▅▅▅▅▅▄▄▄▄▄▄▄▄▄▄▄▄▄▅▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁2731.92812.42595.92573.42532.12529.52553.02515.92524.72528.22462.82469.52472.52488.82479.62477.62469.32459.12455.02467.92475.02495.22500.42517.42215.62215.22217.62218.62220.12219.12220.32222.92207.42208.52209.32209.62208.52209.02208.42207.52210.3NA2209.1NANA
us-gaap:IntangibleAssetsNetExcludingGoodwill ▁▁▁▁▁▂▂▂▂▂▃▃▃▃▄▄▄▄▄▅▅▅▆▆▅▅▅▅▅▆▆▆▆▇▇▇▇▇███487.3419.2445.1461.8492.9540.2594.1616.1660.5696.0712.2758.2802.3859.0897.0937.1976.61015.11055.61110.61162.01225.41276.41325.41089.41128.81168.81207.01247.01286.61328.01365.51403.71443.61478.51516.91557.71599.41636.01672.81712.9NA1791.2NANA
us-gaap:FiniteLivedIntangibleAssetsNet NANA445.1NANANA594.1NANANA712.2NANANA897.0NANANA1055.6NANANA1276.4NANANA1168.8NANANA1328.0NANANA1478.5NANANA1636.0NANANANANANA
 us-gaap:FiniteLivedIntangibleAssetsNet us-gaap:FiniteLivedIntangibleAssetsByMajorClass cdw:CustomerRelationshipsandContractsNANA203.6NANANA324.8NANANA445.5NANANA616.0NANANA761.9NANANA966.3NANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:FiniteLivedIntangibleAssetsNet us-gaap:FiniteLivedIntangibleAssetsByMajorClass us-gaap:OtherIntangibleAssetsNANA4.2NANANA2.0NANANA1.5NANANA2.1NANANA1.9NANANA2.9NANANA1.0NANANA1.2NANANA1.7NANANA1.8NANANANANANA
 us-gaap:FiniteLivedIntangibleAssetsNet us-gaap:FiniteLivedIntangibleAssetsByMajorClass us-gaap:SoftwareAndSoftwareDevelopmentCostsNANA94.6NANANA103.5NANANA80.4NANANA73.0NANANA64.9NANANA58.8NANANA51.2NANANA48.7NANANA37.3NANANA33.8NANANANANANA
 us-gaap:FiniteLivedIntangibleAssetsNet us-gaap:FiniteLivedIntangibleAssetsByMajorClass us-gaap:TradeNamesNANA142.7NANANA163.8NANANA184.8NANANA205.9NANANA226.9NANANA248.4NANANA269.0NANANA290.1NANANA311.1NANANA332.2NANANANANANA
us-gaap:OperatingLeaseRightOfUseAsset ▇██████▅▇█▁124.7128.3130.8133.5137.3129.5131.884.2117.3132.10.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:OtherAssetsNoncurrent ▇▇▆▄▄▄▄▃▄▅▆▇█▆▆▅▅▆▅▅▂▂▂▂▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁49.348.343.927.424.925.523.320.530.735.539.850.460.347.140.832.138.340.536.034.011.812.612.39.42.22.63.22.11.61.51.61.41.61.21.61.62.02.12.32.22.2NA2.2NANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
us-gaap:AccruedIncomeTaxesCurrent ▄█▅▄▇▇▅▃▄▅▃▁▂▃▂▂▂▂▁▂▂▃▁▁▂▃▁▁▂▃▁▁▁▂▁▁▁▁▁▁▁80.4162.6104.268.8145.4135.488.651.459.8101.355.511.222.156.715.131.612.427.50.012.719.751.60.01.715.047.40.20.219.148.86.30.05.617.50.27.29.211.10.06.75.4NA4.2NANA
us-gaap:ContractWithCustomerLiabilityCurrent ██▅▅▆▅▅▃▃▂▂▂▁▂▁325.7326.5243.7246.8275.4257.6252.2212.1200.8192.1178.3188.5169.9193.6158.8NANANA143.5NANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LiabilitiesCurrent ████▇▇▇▆▇▆▅▅▅▅▅▅▅▄▄▄▄▃▃▃▂▂▂▂▂▂▂▂▂▂▁▂▂▁▂▁▁3770.13709.33898.33836.63561.53647.23491.43241.03460.33215.02803.12803.92820.02582.52514.62558.72555.22222.82280.72126.82177.71943.41887.31871.91625.61425.61468.01527.61529.41418.51402.61496.51445.21312.91148.31316.21297.51107.71341.31172.81091.1NA1026.9NANA
us-gaap:LongTermDebtCurrent ▂▂▃▄▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▃▇▁▁▂▁▁▁█19.819.670.972.337.933.734.125.425.525.725.332.038.625.825.541.518.518.518.518.526.126.927.227.515.415.415.415.415.415.445.4170.413.50.040.00.00.00.0201.0NANANANANANA
us-gaap:OperatingLeaseLiabilityCurrent NANA25.6NANANA30.1NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:OtherAccruedLiabilitiesCurrent ▅▆▆▇▇█▇▄▅▅▃▃▃▃▂▃▂▂▂▂▂▂▂▂▁▁▁▁▁▁▂▁▁▁▁▁▁▁▁▁▁342.0398.0424.8491.4506.3548.0491.4291.0350.8346.8232.0209.2212.8204.9180.2184.8161.8155.8149.8159.0152.7134.0166.2128.7113.4113.6113.7111.7113.9105.5130.3116.191.193.396.085.687.591.292.687.483.4NA87.6NANA
us-gaap:OtherLiabilitiesCurrent NANA424.8NANANA491.4NANANA232.0NANANA243.4NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
us-gaap:LiabilitiesNoncurrent ▄▄▄▄▄▂▂▂▂▂▁▁▁▁▁▃▂▂▂▂▂▃▃▃▂▂▂▂▂▃▃▃▅▅▅▆▆▆▆▇█4172.04173.94149.34148.64132.43685.53547.73527.03525.53537.23389.43410.83441.23448.53459.13736.63637.33644.63622.23655.53696.83734.63772.13793.93629.83687.53695.43685.83671.13739.23810.33882.54366.34346.04415.34570.74586.94603.14615.64827.75000.1NA4960.4NANA
us-gaap:LongTermDebtNoncurrent █████▄▃▂▂▂▂▂▂▂▂▃▂▂▂▂▂▂▂▂▁▂▂▁▁▁▂▂▆▆▆████3909.23911.13856.33858.63861.63438.53283.23259.03253.33257.73183.33187.43201.73209.73210.03388.43277.83262.03215.93222.93214.43225.03232.53240.33154.23190.83174.63146.33110.63157.03205.83239.73710.93680.83731.03871.23871.43871.63865.0NANANANANANA
us-gaap:DeferredIncomeTaxLiabilitiesNet ▁▁▂▂▃▂▂▄▅▅▆▆▇██33.129.255.363.167.662.862.4111.3123.1132.7141.9158.4172.9188.9196.3NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:OtherLiabilitiesNoncurrent ▇▇▇█▆▅▇█▆▅▆▆▇▄▅▁▁▁▂▂▆▆▇▅▄▄▃▃▃▃▃▃▄▄▄▆▅▅▃▃▄68.268.568.775.465.255.071.075.062.553.864.265.066.649.952.832.330.032.237.139.461.661.170.057.747.446.745.844.142.641.441.040.950.749.352.060.558.857.745.644.748.4NA40.4NANA
us-gaap:OperatingLeaseLiabilityNoncurrent ███▇▇▆▆▄▅▅▁161.5165.1169.0151.5138.0129.2131.181.786.693.00.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo NANA26.7NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree NANA22.5NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour NANA19.5NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive NANA18.3NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive NANA123.4NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
us-gaap:StockholdersEquity ▇▇██▇▆▆▆▆▆▆▇▇▆▆▅▆▆▇▆▇▇▇▇▆▆▆▆▆▅▅▅▂▂▂▂▂▁▁▁▁1048.81170.31297.11238.51055.6889.7960.3935.1936.1927.3975.21160.71068.9996.9982.9806.5849.1907.31045.5990.51013.41039.91095.91075.7995.8975.5936.5894.0844.8754.8711.7659.8209.0163.8136.598.251.110.6-7.3-35.5-69.3NA-43.5NANA
us-gaap:CommonStockValue ▁▁▁▁▁▁▁▁▃▃▃▃▃▃▃▃▃▆▆▆▆███████████▁1.41.41.41.41.41.41.41.41.51.51.51.51.51.51.51.51.51.61.61.61.61.71.71.71.71.71.71.71.71.71.71.71.4NA1.4NANANA1.4NANANANANANA
us-gaap:AdditionalPaidInCapitalCommonStock ██▇▇▇▇▇▇▆▆▆▆▆▆▆▆▅▅▅▅▅▅▅▅▄▄▄▄▄▄▄▄▁▁▁▁▁▁▁▁▁3294.13262.63204.93161.83138.33114.93095.33073.23047.63025.32996.92970.92953.32928.52911.62903.92890.52874.62857.32843.62831.12817.12806.92793.92729.52718.92711.92704.62698.52691.52688.12685.82211.02210.62209.12202.92196.82191.52186.12179.02175.2NA2166.7NANA
us-gaap:RetainedEarningsAccumulatedDeficit ▂▄▆▆▅▃▄▄▄▄▅▇▆▆▆▄▅▆█▇▇▇██▇▇▇▆▆▅▄▄▄▃▃▃▂▂▂▁▁-2163.5-2004.6-1813.4-1794.0-1932.5-2067.3-2018.6-1985.4-1973.6-1972.0-1892.6-1703.5-1780.8-1854.6-1834.3-1997.2-1927.1-1835.4-1673.8-1738.9-1715.3-1710.0-1651.6-1674.6-1712.5-1717.5-1760.5-1800.6-1848.9-1928.2-1971.8-2024.4-1998.1-2044.8-2073.0-2106.0-2143.9-2180.7-2191.3-2210.1-2247.2NA-2208.0NANA
 us-gaap:RetainedEarningsAccumulatedDeficit us-gaap:StatementScenario,us-gaap:AdjustmentsForNewAccountingPronouncements srt:ScenarioForecast,us-gaap:AccountingStandardsUpdate201912NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax ▄▄▄▂▁▁▃▁▂▂▂▃▃▄▄▃▃▂▂▃▃▅▅▆▇▇▇▇█▇███████████-83.2-89.1-95.8-130.7-151.6-159.3-117.8-154.1-139.4-127.5-130.6-108.2-105.1-78.5-95.9-101.7-115.8-133.5-139.6-115.8-104.0-68.9-61.1-45.3-22.9-27.6-16.6-11.7-6.5-10.2-6.3-3.3-5.3-2.00.41.3-1.8-0.2-2.1-4.42.7NA-2.2NANA
us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue ▄▄▄▃▂▂▃▃▃▃▃▂▂▂▂▂▂▃▂▂▂▂▂▂▂▂▂▁▁▁▁█▁▁▁▂20.615.816.511.65.68.810.812.911.812.210.59.99.07.18.68.610.110.69.88.58.26.79.96.27.54.74.93.94.33.32.340.32.11.94.16.5NANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
us-gaap:NetCashProvidedByUsedInOperatingActivities ▂▆█▄▅▄▆▅▄▅▅▅▃▄▆▃▂▆▃▄▁▆▂▄▁▄▃▄▁▅▂▄▂▄▂▃▃▄▃▂▃▄▃▃0.3344.6575.9222.6292.8223.0344.9267.8162.1252.4303.6270.0110.1222.2338.662.96.3369.9104.7186.2-114.5427.6-17.4195.8-78.7177.884.5174.6-70.4246.3-4.5163.7-0.9208.0-49.762.481.7223.043.2-35.965.8141.659.9103.5NA
us-gaap:NetCashProvidedByUsedInInvestingActivities █▂▇▆▆▇▃▇▇▆▇▇▇▇▇▇▇▇▇▇▇▇▆▁▇▇▅▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇19.5-233.6-28.9-72.1-74.6-25.4-181.4-31.1-30.8-88.1-32.7-19.8-17.7-15.9-22.5-21.8-17.2-19.6-22.4-17.8-14.7-11.0-46.2-284.8-12.9-10.5-108.8-14.1-11.7-30.2-16.6-10.5-11.2-8.8-16.3-9.7-7.4-8.3-19.8-9.7-10.3-16.2-42.5-27.1NA
us-gaap:NetCashProvidedByUsedInFinancingActivities ▂▁▃▆█▄▄▃▄▄▃▄▄▄▃▅▄▃▅▄▅▄▅▄▅▄▅▅▅▄▄▅▅▄▄▅▅▃▅▅▄▄▅▅-399.0-643.5-392.90000000000003137.40000000000006524.3-130.0-181.3-263.3-225.0-80.2-319.5-97.1-207.0-131.2-271.1-20.9-164.5-362.266.3-178.213.7-206.43.4-146.8-20.4-62.711.7-29.02.3-97.0-140.916.945.2-89.5-88.7-19.248.3-278.449.528.4-84.5-88.8-48.1-35.8NA
us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect ▂▁▅▆█▄▄▄▃▄▄▅-377.4-531.6160.7291.1744.060.4-12.9-27.6-96.284.9-49.3154.4NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
us-gaap:DepreciationDepletionAndAmortization ▁▁▄█▇▅▃▃▃▃▃▃▃▃▃▃▃▃▂▂▂▃▂▂▂▂▂▂▂▂▂▂▂▂▁▂▂▂▁▁▁46.645.276.6132.4125.291.469.668.265.064.366.965.866.366.665.765.765.464.263.863.163.764.062.459.952.652.552.051.852.052.051.952.052.352.051.153.453.252.551.351.150.8NANANANA
us-gaap:IncreaseDecreaseInAccountsReceivable ▅▄▃▆▂▆▅▃▇▄▄▄█▃▄▃█▂▆▃▇▁▆▄▇▃▅▃▆▂▅▃▅▄▄▄▆▂▄▅▅▄▃▄124.815.7-78.5224.5-128.6209.073.0-58.3242.0-11.930.839.1355.7-60.58.0-35.9340.9-184.6162.0-57.0312.5-237.6164.220.7263.1-105.491.4-49.5188.9-113.2142.9-81.0127.7-18.8-11.637.1145.4-162.3-3.382.5100.3-14.2-29.70.4NA
us-gaap:IncreaseDecreaseInInventories █▃▅▂▅▆▄▃▆█▃▁▇▆▁▅▄▅▄▃▅▆▃▃▆▄▁▃▆▄▅▃▄▅▃▅▃▅▄▃▅▄▄▄143.3-15.437.2-55.122.966.41.9-46.263.1134.2-25.3-95.695.372.4-99.032.717.540.33.9-34.430.868.2-23.3-44.179.219.7-85.9-25.961.16.528.3-24.820.143.9-32.225.2-25.125.06.5-33.540.215.8-12.1-7.7NA
us-gaap:NetCashProvidedByUsedInOperatingActivities ▂▆█▄▅▄▆▅▄▅▅▅▃▄▆▃▂▆▃▄▁▆▂▄▁▄▃▄▁▅▂▄▂▄▂▃▃▄▃▂▃▄▃▃0.3344.6575.9222.6292.8223.0344.9267.8162.1252.4303.6270.0110.1222.2338.662.96.3369.9104.7186.2-114.5427.6-17.4195.8-78.7177.884.5174.6-70.4246.3-4.5163.7-0.9208.0-49.762.481.7223.043.2-35.965.8141.659.9103.5NA
us-gaap:NetIncomeLoss █▇▇▆▆▆▆▆▆▅▅▆▆▅▆▅▅▃▄▅▄▄▄▅▄▃▃▃▄▃▃▂▃▂▃▃▃▂▂▃▁▂▁▂▂274.1232.6238.3193.2189.1167.9185.6201.7196.6152.9159.3183.7173.0127.0195.2129.2141.057.6103.2125.9117.577.889.3150.9108.254.751.855.686.650.960.0-2.246.728.333.338.036.810.919.037.1-34.8-4.2-24.1-0.3-7.0
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
us-gaap:NetCashProvidedByUsedInInvestingActivities █▂▇▆▆▇▃▇▇▆▇▇▇▇▇▇▇▇▇▇▇▇▆▁▇▇▅▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇19.5-233.6-28.9-72.1-74.6-25.4-181.4-31.1-30.8-88.1-32.7-19.8-17.7-15.9-22.5-21.8-17.2-19.6-22.4-17.8-14.7-11.0-46.2-284.8-12.9-10.5-108.8-14.1-11.7-30.2-16.6-10.5-11.2-8.8-16.3-9.7-7.4-8.3-19.8-9.7-10.3-16.2-42.5-27.1NA
us-gaap:PaymentsToAcquirePropertyPlantAndEquipment ▁▁▂▂▄▂█▂▂▁▂▁▁▁▂▂▁▁▂▁▁▁▃▂▁▁▁17.820.724.433.674.625.4161.331.124.519.432.719.817.715.922.521.817.219.622.115.714.711.046.221.012.910.020.6NANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
us-gaap:NetCashProvidedByUsedInFinancingActivities ▂▁▃▆█▄▄▃▄▄▃▄▄▄▃▅▄▃▅▄▅▄▅▄▅▄▅▅▅▄▄▅▅▄▄▅▅▃▅▅▄▄▅▅-399.0-643.5-392.90000000000003137.40000000000006524.3-130.0-181.3-263.3-225.0-80.2-319.5-97.1-207.0-131.2-271.1-20.9-164.5-362.266.3-178.213.7-206.43.4-146.8-20.4-62.711.7-29.02.3-97.0-140.916.945.2-89.5-88.7-19.248.3-278.449.528.4-84.5-88.8-48.1-35.8NA
us-gaap:ProceedsFromIssuanceOfLongTermDebt NANA0.0700.0NANA0.0600.0NANA0.00.00.00.00.00.00.02083.00.01483.00.00.00.00.00.0525.0575.0600.00.00.00.0188.61346.60.00.00.00.0135.70.00.01175.00.0NANANA
us-gaap:RepaymentsOfLongTermDebt ▁█3.242.9NANANANA0.9NANANA0.00.00.00.00.00.00.02121.30.01490.40.00.00.00.00.0525.3575.1600.144.379.5161.5533.31299.553.1106.30.00.0136.90.0-1043.01175.00.00.0NANA
us-gaap:PaymentsOfDividendsCommonStock ███████▆▆▆▆▅▅▅▅▄▄▄▄▃▃▃▃▂▂▂▂▂▂▂▂▁▁▁55.856.557.254.154.154.254.542.642.943.443.931.731.832.032.224.424.825.525.617.417.718.018.311.411.511.711.77.37.37.37.30.00.00.0NANANANANANANANANANANA
us-gaap:PaymentsForRepurchaseOfCommonStock ██▅▁▁▄▄▄▄▄▆▂▂▃▁▄▄▄▁▃▃▃▂▃▃▁▁▁▁▁▁▁▁▁▁▁▁▁376.9358.4199.80.00.0140.8163.9161.1155.1177.1289.856.167.2109.20.0174.6184.0175.412.4131.9105.1118.048.0101.691.70.00.00.00.00.00.10.00.00.10.30.10.00.3NANANA0.0NANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
 us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:DebtInstrument,us-gaap:LongtermDebtType cdw:SeniorNotesDue2029,us-gaap:UnsecuredDebtNANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:LongtermDebtType cdw:SeniorNotesDueSeptember2025NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:LongtermDebtType cdw:SeniorNotesdue2025NANANANANANANANANANANANANANA5.0000000000000004e-08NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA

Common Stock Value

us-gaap:CommonStockValue

us-gaap:CommonStockValue


Common
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302012-12-312011-12-31
Value1400000.01400000.01400000.01400000.01400000.01400000.01400000.01400000.01500000.01500000.01500000.01500000.01500000.01500000.01500000.01500000.01500000.01600000.01600000.01600000.01600000.01700000.01700000.01700000.01700000.01700000.01700000.01700000.01700000.01700000.01700000.01700000.01400000.01400000.01400000.0
Percentage of CommonStockValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Shares Issued

us-gaap:SharesIssued us-gaap:StatementEquityComponents

us-gaap:SharesIssued

us-gaap:CommonStock


Shares
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-312014-12-312013-12-31
Value138140141142142142143143145146147150151151153160168172172
Percentage of SharesIssued100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Common Stock Shares Outstanding

us-gaap:CommonStockSharesOutstanding

us-gaap:CommonStockSharesOutstanding


Common
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302012-12-312011-12-31
Value138140141142142142143143145146147150151151153152155158160160163165168169170172172172172172172172145145144
Percentage of CommonStockSharesOutstanding100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Weighted Average Number Of Diluted Shares Outstanding

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding


Weighted
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-30
Value141143144144144147148149153153154156159162164166168171172173173172172166146146145145
Percentage of WeightedAverageNumberOfDilutedSharesOutstanding100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Weighted Average Number Of Shares Outstanding Basic

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic


Weighted
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-30
Value139141142142142144145147150151152153156159162164167169171172170170169166145145145145
Percentage of WeightedAverageNumberOfSharesOutstandingBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount

us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount

us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount


Antidilutive
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-30
Value100000.0100000.0100000.0100000.0100000.0100000.0200000.0100000.0200000.0200000.01000000.01000000.01000000.0400000.0100000.0100000.0400000.0100000.0900000.0400000.000100000.06300000.00000
Percentage of AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.0100.0100.00.00.00.00.0

Earnings Per Share Basic

us-gaap:EarningsPerShareBasic

us-gaap:EarningsPerShareBasic


Earnings
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value1.961.651.671.361.321.181.291.391.351.041.071.221.140.831.280.840.90.360.640.780.710.470.530.890.630.320.30.330.510.30.35-0.010.320.190.230.260.250.08
Percentage of EarningsPerShareBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Earnings Per Share Diluted

us-gaap:EarningsPerShareDiluted

us-gaap:EarningsPerShareDiluted


Earnings
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value1.931.631.651.331.311.161.271.371.331.021.051.21.120.821.260.830.890.350.630.760.70.460.520.880.630.320.30.320.50.30.35-0.010.320.190.230.260.250.07
Percentage of EarningsPerShareDiluted100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Allocated Share Based Compensation Expense

us-gaap:AllocatedShareBasedCompensationExpense

us-gaap:AllocatedShareBasedCompensationExpense


Allocated
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value201516115.68.8101212121010118.11010.011121110.09.78.4117.87.54.74.93.94.33.32.3402.11.9
Percentage of AllocatedShareBasedCompensationExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.40.30.30.20.10.20.20.30.30.30.30.20.30.20.30.30.30.40.30.30.30.30.30.20.20.20.20.10.10.10.11.40.10.1

Comprehensive Income Net Of Tax

us-gaap:ComprehensiveIncomeNetOfTax

us-gaap:ComprehensiveIncomeNetOfTax


Comprehensive
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value2802392732141961262211871841561361801461442011431586379114827073128112434650904757-0.24325324135122130-34.30.2
Percentage of ComprehensiveIncomeNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax5.44.95.54.54.52.94.93.84.03.93.44.13.54.05.43.64.12.02.33.12.32.22.23.73.41.61.51.52.91.82.1-0.01.61.11.21.61.40.60.91.2-1.40.0

Cost Of Goods And Services Sold

us-gaap:CostOfGoodsAndServicesSold

us-gaap:CostOfGoodsAndServicesSold


Cost
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value426340424075393036183632375940913856328533813659349030023224339133532772291430933054259228602933277922982558275826092227226524052327200921752190215719342066216020101779191220061863
Percentage of CostOfGoodsAndServicesSold100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax82.883.682.282.682.982.882.983.483.383.083.083.783.483.385.986.286.285.183.583.483.383.283.783.883.983.483.984.584.084.083.584.083.883.383.683.583.583.483.383.783.383.50.084.583.8

Gross Profit

us-gaap:GrossProfit

us-gaap:GrossProfit


Gross
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value882795880825747756777816773672693713695603614642641552577614610524557567534456491507496425448458451402425432426384412420401350356368359
Percentage of GrossProfit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax17.216.417.817.417.117.217.116.616.717.017.016.316.616.716.416.316.517.016.516.616.716.816.316.216.116.616.115.516.016.016.516.016.216.716.416.516.516.616.616.316.716.50.015.516.2

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

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value371288295250245211236260261191206238229165184206195731621981871231412461728780891378082-4.87344486359152954-53.2-3.1-29.3-0.3-10.9
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax7.26.06.05.35.64.85.25.35.64.85.15.55.54.64.95.35.02.34.75.35.14.04.17.05.23.22.62.74.43.03.0-0.22.61.81.82.42.30.71.22.1-2.2-0.10.0-0.0-0.5

Income Tax Expense Benefit

us-gaap:IncomeTaxExpenseBenefit

us-gaap:IncomeTaxExpenseBenefit


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value9756565656435059643847545639-10.677541659727046529563322833502922-2.626161425224.21017-18.41.1-5.2-0.1-3.9
Percentage of IncomeTaxExpenseBenefit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.91.21.11.21.31.01.11.21.41.01.21.31.41.1-0.32.01.40.51.71.91.91.51.52.71.91.20.91.01.61.10.8-0.11.00.70.61.00.90.20.40.7-0.80.10.0-0.0-0.2

Income Taxes Paid Net

us-gaap:IncomeTaxesPaidNet

us-gaap:IncomeTaxesPaidNet


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value1471049174119.969871031160821071010673906.3941011256.882941194.351781029.51813491.74143380.320-6.81.4-36.41521
Percentage of IncomeTaxesPaidNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax2.90.21.03.70.30.21.51.82.20.31.51.92.60.32.81.92.30.22.72.73.40.22.42.73.60.21.72.43.30.40.70.51.80.11.61.71.50.00.8-0.30.1-1.70.00.9

Interest Income Expense Net

us-gaap:InterestIncomeExpenseNet

us-gaap:InterestIncomeExpenseNet


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-30
Value-35.5-35.6-37.1-40.2-39.7-37.9-38.3-42.3-40.5-38.3-37.1-36.6-37.2-37.7-37.1-37.8-35.9-39.7-33.9-37.6-36.9-38.1-38.4-38.53744485048505156
Percentage of InterestIncomeExpenseNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-0.7-0.7-0.7-0.8-0.9-0.9-0.8-0.9-0.9-1.0-0.9-0.8-0.9-1.0-1.0-1.0-0.9-1.2-1.0-1.0-1.0-1.2-1.1-1.11.11.61.61.51.61.91.92.0

Interest Paid Net

us-gaap:InterestPaidNet

us-gaap:InterestPaidNet


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value4719482338282948314431423142294128482644284429442853682783169826126161371413516136181502715544
Percentage of InterestPaidNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.90.41.00.50.90.70.61.00.71.10.81.00.81.20.81.10.71.50.81.20.81.40.91.30.91.92.20.82.70.63.60.94.60.75.30.55.20.75.50.76.21.30.01.9

Net Income Loss

us-gaap:NetIncomeLoss

us-gaap:NetIncomeLoss


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value274232238193189167185201196152159183173127195129141571031251177789150108545155865060-2.24628333836101937-34.8-4.2-24.1-0.3-7.0
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax5.34.84.84.14.33.84.14.14.23.93.94.24.13.55.23.33.61.83.03.43.22.52.64.33.32.01.71.72.81.92.2-0.11.71.21.31.41.40.50.81.4-1.4-0.20.0-0.0-0.3

us-gaap:NetIncomeLoss us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-30
Value274232238193189167185201196152159183173127195129141571031251177789150108545155865060-2.24628333836101937
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.099.9100.1100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax5.34.84.84.14.33.84.14.14.23.93.94.24.13.55.23.33.61.83.03.43.22.52.64.33.32.01.71.72.81.92.2-0.11.71.21.31.41.40.50.81.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Operating Income Loss

us-gaap:OperatingIncomeLoss

us-gaap:OperatingIncomeLoss


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value36932333231728324528332030022824227426520422124323116919723722316117920420515116418418813514292153120130139136103111139128918110495
Percentage of OperatingIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax7.26.76.76.76.55.66.36.56.55.86.06.36.35.75.96.25.95.25.66.46.15.25.35.86.25.55.45.76.15.15.23.25.55.05.05.35.34.54.55.45.34.30.04.44.3

us-gaap:OperatingIncomeLoss us-gaap:ConsolidationItems

us-gaap:CorporateNonSegment


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value-26.3-45.2-30.6-49.8-37.0-36.0-35.9-35.8-32.0-31.9-35.0-33.7-35.1-34.5-31.4-31.8-32.4-31.5-31.1-30.5-29.4
Percentage of OperatingIncomeLoss-7.1-14.0-9.2-15.7-13.1-14.6-12.6-11.2-10.7-13.9-14.4-12.3-13.2-16.9-14.2-13.0-14.0-18.6-15.8-12.8-13.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-0.5-0.9-0.6-1.0-0.8-0.8-0.8-0.7-0.7-0.8-0.9-0.8-0.8-1.0-0.8-0.8-0.8-1.0-0.9-0.8-0.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:CorporateNonSegment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

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

us-gaap:OperatingSegments, cdw:CorporateSegmentPrivateSectorBusiness


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value175161110128123127154138157134143127141124128121127112183120117
Percentage of OperatingIncomeLoss47.449.933.340.443.451.854.443.352.358.859.146.353.261.157.949.755.066.093.050.552.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax3.43.32.22.72.82.93.42.83.43.43.52.93.43.53.43.13.33.45.33.23.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments cdw:CorporateSegmentPrivateSectorBusiness8.88.90.07.77.96.70.07.38.37.80.07.58.18.00.07.88.07.80.00.00.0

us-gaap:OperatingSegments, cdw:PublicSegmentGovernmentAgenciesEducationandHealthcare


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value153136209196159112101168129768813811371861221046081120108
Percentage of OperatingIncomeLoss41.442.363.261.756.445.735.652.543.133.236.350.242.635.139.150.245.235.841.150.548.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax3.02.84.24.13.72.62.23.42.81.92.23.22.72.02.33.12.71.92.33.23.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments cdw:PublicSegmentGovernmentAgenciesEducationandHealthcare7.47.10.08.57.97.40.08.07.05.70.07.46.95.80.07.26.45.30.00.00.0

us-gaap:OperatingSegments, cdw:SmallBusiness


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value444226242127292726242424242220171916161817
Percentage of OperatingIncomeLoss11.913.27.97.67.411.110.38.58.910.710.28.89.310.99.37.38.49.88.47.67.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.90.90.50.50.50.60.60.60.60.60.60.60.60.60.60.50.50.50.50.50.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments cdw:SmallBusiness9.19.90.07.27.07.00.07.07.06.90.07.17.56.80.05.86.15.70.00.00.0

us-gaap:OperatingSegments, us-gaap:AllOtherSegments


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value2327161816143521192521192119181412121610.09.4
Percentage of OperatingIncomeLoss6.48.64.85.95.86.012.36.86.411.28.97.08.29.78.25.95.57.58.24.24.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.50.60.30.40.40.30.80.40.40.60.50.40.50.50.50.40.30.40.50.30.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments us-gaap:AllOtherSegments4.04.10.04.03.42.60.04.33.64.80.04.34.54.10.03.83.53.40.00.00.0

Other Nonoperating Income Expense

us-gaap:OtherNonoperatingIncomeExpense

us-gaap:OtherNonoperatingIncomeExpense


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value361.1-0.1-27.51.73.9-9.5-17.41.41.00.80.21.5-0.70.20.70.30.9-0.50.40.91.00.2-18.04.04.51.30.70.10.50.6-0.20.20.4-0.10.20.2-0.2-0.30.50.00.5-0.10.2-0.1
Percentage of OtherNonoperatingIncomeExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.70.0-0.0-0.60.00.1-0.2-0.40.00.00.00.00.0-0.00.00.00.00.0-0.00.00.00.00.0-0.50.10.20.00.00.00.00.0-0.00.00.0-0.00.00.0-0.0-0.00.00.00.00.00.0-0.0

Revenue From Contract With Customer Excluding Assessed Tax

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value514648374956475643654389453649074629395740744373418636063752393338913256349237083664311634183501331427553050326631062652271328642779241126012623258423192479258124122129226923742223
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax cdw:Public, us-gaap:StatementBusinessSegments

cdw:Education, cdw:Public


Revenue
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value10261078876476430807773400425793712397395691704393
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax20.722.720.110.89.516.416.710.110.418.117.011.010.517.618.112.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax20.722.720.110.89.516.416.710.110.418.117.011.010.517.618.112.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cdw:Education cdw:Public100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cdw:GovernmentSegment, cdw:Public


Revenue
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value842847719568659793578488546639493418619591523374
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax17.017.816.513.014.516.212.512.313.414.611.811.616.515.013.411.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax17.017.816.513.014.516.212.512.313.414.611.811.616.515.013.411.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cdw:GovernmentSegment cdw:Public100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:HealthCare, cdw:Public


Revenue
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value427367425480503500488441443442429414411410404385
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax8.67.79.710.911.110.210.511.210.910.110.311.511.010.410.411.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax8.67.79.710.911.110.210.511.210.910.110.311.511.010.410.411.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:HealthCare cdw:Public100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

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

us-gaap:OperatingSegments, cdw:SalesChannelCorporate, cdw:CorporateSegmentPrivateSectorBusiness


Revenue
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value1717166015571911196519131883173618361706173315651599155215801440
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax34.734.935.743.543.339.040.743.945.139.041.443.442.639.540.644.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax34.734.935.743.543.339.040.743.945.139.041.443.442.639.540.644.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments cdw:SalesChannelCorporate cdw:CorporateSegmentPrivateSectorBusiness100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingSegments, cdw:SalesChannelEducation, cdw:PublicSegmentGovernmentAgenciesEducationandHealthcare


Revenue
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value10261078876476430807773400425793712397395691704393
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax20.722.720.110.89.516.416.710.110.418.117.011.010.517.618.112.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax20.722.720.110.89.516.416.710.110.418.117.011.010.517.618.112.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments cdw:SalesChannelEducation cdw:PublicSegmentGovernmentAgenciesEducationandHealthcare100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingSegments, cdw:SalesChannelGovernment, cdw:PublicSegmentGovernmentAgenciesEducationandHealthcare


Revenue
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value842847719568659793578488546639493418619591523374
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax17.017.816.513.014.516.212.512.313.414.611.811.616.515.013.411.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax17.017.816.513.014.516.212.512.313.414.611.811.616.515.013.411.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments cdw:SalesChannelGovernment cdw:PublicSegmentGovernmentAgenciesEducationandHealthcare100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingSegments, cdw:SalesChannelHealthcare, cdw:PublicSegmentGovernmentAgenciesEducationandHealthcare


Revenue
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value427367425480503500488441443442429414411410404385
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax8.67.79.710.911.110.210.511.210.910.110.311.511.010.410.411.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax8.67.79.710.911.110.210.511.210.910.110.311.511.010.410.411.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments cdw:SalesChannelHealthcare cdw:PublicSegmentGovernmentAgenciesEducationandHealthcare100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingSegments, cdw:SalesChannelOther, us-gaap:AllOtherSegments


Revenue
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value575465484561587507528535461451487483418381363369
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax11.69.811.112.812.910.311.413.511.310.311.613.411.29.79.311.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax11.69.811.112.812.910.311.413.511.310.311.613.411.29.79.311.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments cdw:SalesChannelOther us-gaap:AllOtherSegments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingSegments, cdw:SalesChannelSmallBusiness, cdw:SmallBusiness


Revenue
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value366337302391391386377355362340329327308305315292
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax7.47.16.98.98.67.98.29.08.97.87.99.18.27.88.19.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax7.47.16.98.98.67.98.29.08.97.87.99.18.27.88.19.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments cdw:SalesChannelSmallBusiness cdw:SmallBusiness100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

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

us-gaap:OperatingSegments, cdw:OtherProductsAndServices, cdw:CorporateSegmentPrivateSectorBusiness


Revenue
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value16161421171817161616171616171616
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.30.30.30.50.40.40.40.40.40.40.40.50.40.40.40.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.30.30.30.50.40.40.40.40.40.40.40.50.40.40.40.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments cdw:OtherProductsAndServices cdw:CorporateSegmentPrivateSectorBusiness100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingSegments, cdw:OtherProductsAndServices, cdw:PublicSegmentGovernmentAgenciesEducationandHealthcare


Revenue
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value187.58.77.06.06.24.84.33.84.54.24.14.25.24.54.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.40.20.20.20.10.10.10.10.10.10.10.10.10.10.10.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.40.20.20.20.10.10.10.10.10.10.10.10.10.10.10.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments cdw:OtherProductsAndServices cdw:PublicSegmentGovernmentAgenciesEducationandHealthcare100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingSegments, cdw:OtherProductsAndServices, cdw:SmallBusiness


Revenue
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value5.25.04.85.45.35.35.45.35.35.15.35.45.05.15.35.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments cdw:OtherProductsAndServices cdw:SmallBusiness100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingSegments, cdw:OtherProductsAndServices, us-gaap:AllOtherSegments


Revenue
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value3.42.22.22.43.22.52.83.12.42.02.42.02.02.02.01.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.10.00.10.10.10.10.10.10.10.00.10.10.10.10.10.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.10.00.10.10.10.10.10.10.10.00.10.10.10.10.10.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments cdw:OtherProductsAndServices us-gaap:AllOtherSegments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingSegments, cdw:Services, cdw:CorporateSegmentPrivateSectorBusiness


Revenue
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value100107921001099799889483817879798175
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax2.02.32.12.32.42.02.12.22.31.91.92.22.12.02.12.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax2.02.32.12.32.42.02.12.22.31.91.92.22.12.02.12.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments cdw:Services cdw:CorporateSegmentPrivateSectorBusiness100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingSegments, cdw:Services, cdw:PublicSegmentGovernmentAgenciesEducationandHealthcare


Revenue
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value71636667485950424248373431393428
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.51.31.51.51.11.21.11.11.01.10.91.00.81.00.90.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.51.31.51.51.11.21.11.11.01.10.91.00.81.00.90.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments cdw:Services cdw:PublicSegmentGovernmentAgenciesEducationandHealthcare100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingSegments, cdw:Services, cdw:SmallBusiness


Revenue
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value9.17.07.18.27.66.77.07.07.66.67.76.36.55.56.26.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.20.10.20.20.20.10.20.20.20.20.20.20.20.10.20.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.20.10.20.20.20.10.20.20.20.20.20.20.20.10.20.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments cdw:Services cdw:SmallBusiness100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingSegments, cdw:Services, us-gaap:AllOtherSegments


Revenue
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value42494854798066594440424232333031
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.91.01.11.21.81.61.41.51.10.91.01.20.90.90.81.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.91.01.11.21.81.61.41.51.10.91.01.20.90.90.81.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments cdw:Services us-gaap:AllOtherSegments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingSegments, cdw:SoftwareProducts, cdw:CorporateSegmentPrivateSectorBusiness


Revenue
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value289284243276294269270247280228254219271202243202
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax5.86.05.66.36.55.55.86.36.95.26.16.17.25.26.36.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax5.86.05.66.36.55.55.86.36.95.26.16.17.25.26.36.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments cdw:SoftwareProducts cdw:CorporateSegmentPrivateSectorBusiness100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingSegments, cdw:SoftwareProducts, cdw:PublicSegmentGovernmentAgenciesEducationandHealthcare


Revenue
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value218304227239251324262221246290255183216265263162
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax4.46.45.25.55.56.65.75.66.16.66.15.15.86.76.85.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax4.46.45.25.55.56.65.75.66.16.66.15.15.86.76.85.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments cdw:SoftwareProducts cdw:PublicSegmentGovernmentAgenciesEducationandHealthcare100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingSegments, cdw:SoftwareProducts, cdw:SmallBusiness


Revenue
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value49434353524748484444424342374239
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.00.91.01.21.21.01.01.21.11.01.01.21.11.01.11.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.00.91.01.21.21.01.01.21.11.01.01.21.11.01.11.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments cdw:SoftwareProducts cdw:SmallBusiness100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingSegments, cdw:SoftwareProducts, us-gaap:AllOtherSegments


Revenue
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value81736897876669775744535946383943
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.71.51.62.21.91.31.52.01.41.01.31.61.21.01.01.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.71.51.62.21.91.31.52.01.41.01.31.61.21.01.01.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments cdw:SoftwareProducts us-gaap:AllOtherSegments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingSegments, cdw:TotalHardware, cdw:CorporateSegmentPrivateSectorBusiness


Revenue
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value1310125212071513154315281496138314451378138012511231125312381146
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax26.426.327.734.534.031.132.335.035.531.533.034.732.831.931.835.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax26.426.327.734.534.031.132.335.035.531.533.034.732.831.931.835.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments cdw:TotalHardware cdw:CorporateSegmentPrivateSectorBusiness100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingSegments, cdw:TotalHardware, cdw:PublicSegmentGovernmentAgenciesEducationandHealthcare


Revenue
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value198819171719121012871711152310631121153113371008117413831329958
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax40.140.339.427.628.434.932.926.927.535.032.028.031.335.234.229.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax40.140.339.427.628.434.932.926.927.535.032.028.031.335.234.229.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments cdw:TotalHardware cdw:PublicSegmentGovernmentAgenciesEducationandHealthcare100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingSegments, cdw:TotalHardware, cdw:SmallBusiness


Revenue
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value302281247324325326316295305284273272253256261240
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax6.15.95.77.47.26.76.87.57.56.56.57.66.86.56.77.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax6.15.95.77.47.26.76.87.57.56.56.57.66.86.56.77.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments cdw:TotalHardware cdw:SmallBusiness100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingSegments, cdw:TotalHardware, us-gaap:AllOtherSegments


Revenue
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value448340364407416358389395357365389379337307291293
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax9.07.28.49.39.27.38.410.08.88.39.310.59.07.87.59.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax9.07.28.49.39.27.38.410.08.88.39.310.59.07.87.59.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments cdw:TotalHardware us-gaap:AllOtherSegments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

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

us-gaap:OperatingSegments, cdw:CorporateSegmentPrivateSectorBusiness


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value198318051717166015571911196519131883173618361706173315651599155215801440
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax38.537.334.734.935.743.543.339.040.743.945.139.041.443.442.639.540.644.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax38.537.334.734.935.743.543.339.040.743.945.139.041.443.442.639.540.644.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments cdw:CorporateSegmentPrivateSectorBusiness100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingSegments, cdw:PublicSegmentGovernmentAgenciesEducationandHealthcare


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value208019212296229320221525159321001840133014141875163512301426169316321153
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax40.439.746.348.246.334.835.142.839.733.634.742.939.134.138.043.142.035.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax40.439.746.348.246.334.835.142.839.733.634.742.939.134.138.043.142.035.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments cdw:PublicSegmentGovernmentAgenciesEducationandHealthcare100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingSegments, cdw:SmallBusiness


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value482432366337302391391386377355362340329327308305315292
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax9.48.97.47.16.98.98.67.98.29.08.97.87.99.18.27.88.19.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax9.48.97.47.16.98.98.67.98.29.08.97.87.99.18.27.88.19.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments cdw:SmallBusiness100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingSegments, us-gaap:AllOtherSegments


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value599677575465484561587507528535461451487483418381363369
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax11.614.011.69.811.112.812.910.311.413.511.310.311.613.411.29.79.311.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax11.614.011.69.811.112.812.910.311.413.511.310.311.613.411.29.79.311.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments us-gaap:AllOtherSegments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

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

us-gaap:OperatingSegments, cdw:CorporateSegmentPrivateSectorBusiness, cdw:TransferredAtPointInTimeAgent


Revenue
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value116121112107112111118104109851019288829281
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax2.32.62.62.52.52.32.62.62.72.02.42.62.42.12.42.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax2.32.62.62.52.52.32.62.62.72.02.42.62.42.12.42.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments cdw:CorporateSegmentPrivateSectorBusiness cdw:TransferredAtPointInTimeAgent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingSegments, cdw:CorporateSegmentPrivateSectorBusiness, cdw:TransferredAtPointInTimePrincipal


Revenue
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value1538147413871741178517431708158116751571158314261464142314371314
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax31.031.031.839.739.435.536.940.041.135.937.839.539.036.236.940.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax31.031.031.839.739.435.536.940.041.135.937.839.539.036.236.940.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments cdw:CorporateSegmentPrivateSectorBusiness cdw:TransferredAtPointInTimePrincipal100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingSegments, cdw:CorporateSegmentPrivateSectorBusiness, cdw:TransferredOverTimePrincipal


Revenue
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value62645862675957505249484646464945
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.31.41.31.41.51.21.21.31.31.11.21.31.21.21.31.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.31.41.31.41.51.21.21.31.31.11.21.31.21.21.31.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments cdw:CorporateSegmentPrivateSectorBusiness cdw:TransferredOverTimePrincipal100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingSegments, cdw:PublicSegmentGovernmentAgenciesEducationandHealthcare, cdw:TransferredAtPointInTimeAgent


Revenue
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value82896852577965465064554141535237
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.71.91.61.21.31.61.41.21.21.51.31.11.11.41.31.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.71.91.61.21.31.61.41.21.21.51.31.11.11.41.31.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments cdw:PublicSegmentGovernmentAgenciesEducationandHealthcare cdw:TransferredAtPointInTimeAgent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingSegments, cdw:PublicSegmentGovernmentAgenciesEducationandHealthcare, cdw:TransferredAtPointInTimePrincipal


Revenue
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value2138208018541404150219391725124313121764153711711342159715391105
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax43.143.742.532.033.139.537.331.432.240.436.732.535.840.639.634.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax43.143.742.532.033.139.537.331.432.240.436.732.535.840.639.634.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments cdw:PublicSegmentGovernmentAgenciesEducationandHealthcare cdw:TransferredAtPointInTimePrincipal100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingSegments, cdw:PublicSegmentGovernmentAgenciesEducationandHealthcare, cdw:TransferredOverTimePrincipal


Revenue
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value751249968338249415046421742434110
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.52.62.31.60.71.71.11.01.21.11.00.51.11.11.10.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.52.62.31.60.71.71.11.01.21.11.00.51.11.11.10.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments cdw:PublicSegmentGovernmentAgenciesEducationandHealthcare cdw:TransferredOverTimePrincipal100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingSegments, cdw:SmallBusiness, cdw:TransferredAtPointInTimeAgent


Revenue
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value22201822201920191816171615141614
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.50.40.40.50.50.40.40.50.50.40.40.50.40.40.40.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.50.40.40.50.50.40.40.50.50.40.40.50.40.40.40.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments cdw:SmallBusiness cdw:TransferredAtPointInTimeAgent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingSegments, cdw:SmallBusiness, cdw:TransferredAtPointInTimePrincipal


Revenue
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value340313280366368364355335341321309309291289296275
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax6.96.66.48.48.17.47.78.58.47.37.48.67.87.47.68.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax6.96.66.48.48.17.47.78.58.47.37.48.67.87.47.68.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments cdw:SmallBusiness cdw:TransferredAtPointInTimePrincipal100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingSegments, cdw:SmallBusiness, cdw:TransferredOverTimePrincipal


Revenue
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value3.82.22.52.82.12.61.90.62.32.12.81.72.01.92.32.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.10.00.10.10.00.10.00.00.10.00.10.00.10.00.10.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.10.00.10.10.00.10.00.00.10.00.10.00.10.00.10.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments cdw:SmallBusiness cdw:TransferredOverTimePrincipal100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingSegments, us-gaap:AllOtherSegments, cdw:TransferredAtPointInTimeAgent


Revenue
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value191314131715131312129.7154.88.06.98.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.40.30.30.30.40.30.30.30.30.30.20.40.10.20.20.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.40.30.30.30.40.30.30.30.30.30.20.40.10.20.20.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments us-gaap:AllOtherSegments cdw:TransferredAtPointInTimeAgent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingSegments, us-gaap:AllOtherSegments, cdw:TransferredAtPointInTimePrincipal


Revenue
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value502407426499516443465474410402441433378340325331
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax10.18.69.811.411.49.010.012.010.19.210.512.010.18.78.410.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax10.18.69.811.411.49.010.012.010.19.210.512.010.18.78.410.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments us-gaap:AllOtherSegments cdw:TransferredAtPointInTimePrincipal100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingSegments, us-gaap:AllOtherSegments, cdw:TransferredOverTimePrincipal


Revenue
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value53444349524750473836363435323130
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.10.91.01.11.21.01.11.21.00.80.91.00.90.80.80.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.10.91.01.11.21.01.11.21.00.80.91.00.90.80.80.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments us-gaap:AllOtherSegments cdw:TransferredOverTimePrincipal100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

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

us-gaap:OperatingSegments, country:US, cdw:CorporateSegmentPrivateSectorBusiness


Revenue
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value171416581542190719601910188117321834170417311564159815511578
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax34.634.935.343.543.238.940.643.845.039.041.443.442.639.440.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax34.634.935.343.543.238.940.643.845.039.041.443.442.639.440.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments country:US cdw:CorporateSegmentPrivateSectorBusiness100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingSegments, country:US, cdw:PublicSegmentGovernmentAgenciesEducationandHealthcare


Revenue
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value229622932022152515932100184013301414187516351230142616931632
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax46.348.246.334.835.142.839.733.634.742.939.134.138.043.142.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax46.348.246.334.835.142.839.733.634.742.939.134.138.043.142.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments country:US cdw:PublicSegmentGovernmentAgenciesEducationandHealthcare100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingSegments, country:US, cdw:SmallBusiness


Revenue
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value366337302391391386377355362340329327308305315
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax7.47.16.98.98.67.98.29.08.97.87.99.18.27.88.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax7.47.16.98.98.67.98.29.08.97.87.99.18.27.88.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments country:US cdw:SmallBusiness100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingSegments, country:US, us-gaap:AllOtherSegments


Revenue
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value4.6999999999999986.13.86.27.77.68.98.46.96.88.09.26.36.07.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.10.10.10.10.20.20.20.20.20.20.20.30.20.20.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.10.10.10.10.20.20.20.20.20.20.20.30.20.20.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments country:US us-gaap:AllOtherSegments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingSegments, us-gaap:NonUs, cdw:CorporateSegmentPrivateSectorBusiness


Revenue
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value3.01.6143.25.22.62.23.31.92.42.41.41.21.61.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.10.00.30.10.10.10.00.10.00.10.10.00.00.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.10.00.30.10.10.10.00.10.00.10.10.00.00.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments us-gaap:NonUs cdw:CorporateSegmentPrivateSectorBusiness100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingSegments, us-gaap:NonUs, us-gaap:AllOtherSegments


Revenue
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value571459480555579499519527454444479473412375356
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax11.59.711.012.612.810.211.213.311.210.211.513.111.09.59.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax11.59.711.012.612.810.211.213.311.210.211.513.111.09.59.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments us-gaap:NonUs us-gaap:AllOtherSegments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ContractWithCustomerSalesChannel

cdw:SalesChannelCorporate


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value198318051717166015571911196519131883173618361706173315651599155215801440
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax38.537.334.734.935.743.543.339.040.743.945.139.041.443.442.639.540.644.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax38.537.334.734.935.743.543.339.040.743.945.139.041.443.442.639.540.644.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cdw:SalesChannelCorporate100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cdw:SalesChannelEducation


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value111294310261078876476430807773400425793712397395691704393
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax21.619.520.722.720.110.89.516.416.710.110.418.117.011.010.517.618.112.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax21.619.520.722.720.110.89.516.416.710.110.418.117.011.010.517.618.112.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cdw:SalesChannelEducation100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cdw:SalesChannelGovernment


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value513516842847719568659793578488546639493418619591523374
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax10.010.717.017.816.513.014.516.212.512.313.414.611.811.616.515.013.411.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax10.010.717.017.816.513.014.516.212.512.313.414.611.811.616.515.013.411.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cdw:SalesChannelGovernment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cdw:SalesChannelHealthcare


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value455462427367425480503500488441443442429414411410404385
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax8.89.68.67.79.710.911.110.210.511.210.910.110.311.511.010.410.411.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax8.89.68.67.79.710.911.110.210.511.210.910.110.311.511.010.410.411.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cdw:SalesChannelHealthcare100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cdw:SalesChannelOther


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value599677575465484561587507528535461451487483418381363369
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax11.614.011.69.811.112.812.910.311.413.511.310.311.613.411.29.79.311.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax11.614.011.69.811.112.812.910.311.413.511.310.311.613.411.29.79.311.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cdw:SalesChannelOther100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cdw:SalesChannelSmallBusiness


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value482432366337302391391386377355362340329327308305315292
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax9.48.97.47.16.98.98.67.98.29.08.97.87.99.18.27.88.19.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax9.48.97.47.16.98.98.67.98.29.08.97.87.99.18.27.88.19.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cdw:SalesChannelSmallBusiness100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ContractWithCustomerSalesChannel, us-gaap:StatementBusinessSegments

cdw:SalesChannelCorporate, cdw:CorporateSegmentPrivateSectorBusiness


Revenue
Period End2021-06-302021-03-312020-06-302020-03-31
Value1983180515571911
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax38.537.335.743.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax38.537.335.743.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cdw:SalesChannelCorporate cdw:CorporateSegmentPrivateSectorBusiness100.0100.0100.0100.0

cdw:SalesChannelEducation, cdw:PublicSegmentGovernmentAgenciesEducationandHealthcare


Revenue
Period End2021-06-302021-03-312020-06-302020-03-31
Value1112943876476
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax21.619.520.110.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax21.619.520.110.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cdw:SalesChannelEducation cdw:PublicSegmentGovernmentAgenciesEducationandHealthcare100.0100.0100.0100.0

cdw:SalesChannelGovernment, cdw:PublicSegmentGovernmentAgenciesEducationandHealthcare


Revenue
Period End2021-06-302021-03-312020-06-302020-03-31
Value513516719568
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax10.010.716.513.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax10.010.716.513.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cdw:SalesChannelGovernment cdw:PublicSegmentGovernmentAgenciesEducationandHealthcare100.0100.0100.0100.0

cdw:SalesChannelHealthcare, cdw:PublicSegmentGovernmentAgenciesEducationandHealthcare


Revenue
Period End2021-06-302021-03-312020-06-302020-03-31
Value455462425480
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax8.89.69.710.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax8.89.69.710.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cdw:SalesChannelHealthcare cdw:PublicSegmentGovernmentAgenciesEducationandHealthcare100.0100.0100.0100.0

cdw:SalesChannelOther, us-gaap:AllOtherSegments


Revenue
Period End2021-06-302021-03-312020-06-302020-03-31
Value599677484561
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax11.614.011.112.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax11.614.011.112.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cdw:SalesChannelOther us-gaap:AllOtherSegments100.0100.0100.0100.0

cdw:SalesChannelSmallBusiness, cdw:SmallBusiness


Revenue
Period End2021-06-302021-03-312020-06-302020-03-31
Value482432302391
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax9.48.96.98.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax9.48.96.98.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cdw:SalesChannelSmallBusiness cdw:SmallBusiness100.0100.0100.0100.0

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ProductOrService

cdw:Desktops


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value293265249245253384414448431303327341345303329306308263
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax5.75.55.05.25.88.89.19.19.37.78.07.88.28.48.87.87.98.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax5.75.55.05.25.88.89.19.19.37.78.07.88.28.48.87.87.98.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cdw:Desktops100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cdw:EnterpriseAndDataStorageIncludingDrives


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value242259257249199240296283273290285293264256280281291234
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax4.75.45.25.24.65.56.55.85.97.37.06.76.37.17.57.17.57.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax4.75.45.25.24.65.56.55.85.97.37.06.76.37.17.57.17.57.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cdw:EnterpriseAndDataStorageIncludingDrives100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cdw:NetcommProducts


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value483454501525471456551567563512556581498482496544540458
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax9.49.410.111.110.810.412.211.612.212.913.713.311.913.413.213.813.914.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax9.49.410.111.110.810.412.211.612.212.913.713.311.913.413.213.813.914.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cdw:NetcommProducts100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cdw:NotebooksMobileDevices


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value171015911563138414281111109413251232977101111141068858907964912735
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax33.232.931.529.132.725.324.127.026.624.724.825.525.523.824.224.523.522.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax33.232.931.529.132.725.324.127.026.624.724.825.525.523.824.224.523.522.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cdw:NotebooksMobileDevices100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cdw:OtherHardware


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value1085106711641070937949916946876782766908879751720814778711
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax21.122.123.522.521.521.620.219.318.919.818.820.821.020.819.220.720.021.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax21.122.123.522.521.521.620.219.318.919.818.820.821.020.819.220.720.021.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cdw:OtherHardware100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cdw:OtherProductsAndServices


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value312843302935313230292828292827292827
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.60.60.90.60.70.80.70.70.70.70.70.60.70.80.70.70.70.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.60.60.90.60.70.80.70.70.70.70.70.60.70.80.70.70.70.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cdw:OtherProductsAndServices100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cdw:Services


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value251233224227214230245243223196188178168161150157152141
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax4.94.84.54.84.95.35.45.04.85.04.64.14.04.54.04.03.94.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax4.94.84.54.84.95.35.45.04.85.04.64.14.04.54.04.03.94.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cdw:Services100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cdw:SoftwareProducts


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value637610639706582666686707650593628607605505576544589447
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax12.412.612.914.813.315.215.114.414.115.015.413.914.514.015.413.815.213.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax12.412.612.914.813.315.215.114.414.115.015.413.914.514.015.413.815.213.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cdw:SoftwareProducts100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cdw:TotalHardware


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value422539654049379235393456357339243725313732293558338229122997320131202639
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax82.182.081.779.781.178.878.880.080.579.379.381.480.880.779.981.480.281.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax82.182.081.779.781.178.878.880.080.579.379.381.480.880.779.981.480.281.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cdw:TotalHardware100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cdw:Video


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value410326313315248314300353348271281319325259262290289235
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax8.06.76.36.65.77.26.67.27.56.96.97.37.87.27.07.47.47.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax8.06.76.36.65.77.26.67.27.56.96.97.37.87.27.07.47.47.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cdw:Video100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ProductOrService, us-gaap:StatementBusinessSegments

cdw:OtherProductsAndServices, cdw:CorporateSegmentPrivateSectorBusiness


Revenue
Period End2021-06-302021-03-312020-06-302020-03-31
Value18151321
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.40.30.30.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.40.30.30.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cdw:OtherProductsAndServices cdw:CorporateSegmentPrivateSectorBusiness100.0100.0100.0100.0

cdw:OtherProductsAndServices, cdw:PublicSegmentGovernmentAgenciesEducationandHealthcare


Revenue
Period End2021-06-302021-03-312020-06-302020-03-31
Value4.24.58.67.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.10.10.20.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.10.10.20.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cdw:OtherProductsAndServices cdw:PublicSegmentGovernmentAgenciesEducationandHealthcare100.0100.0100.0100.0

cdw:OtherProductsAndServices, cdw:SmallBusiness


Revenue
Period End2021-06-302021-03-312020-06-302020-03-31
Value5.85.34.75.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.10.10.10.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.10.10.10.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cdw:OtherProductsAndServices cdw:SmallBusiness100.0100.0100.0100.0

cdw:OtherProductsAndServices, us-gaap:AllOtherSegments


Revenue
Period End2021-06-302021-03-312020-06-302020-03-31
Value3.03.62.22.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.10.10.10.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.10.10.10.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cdw:OtherProductsAndServices us-gaap:AllOtherSegments100.0100.0100.0100.0

cdw:Services, cdw:CorporateSegmentPrivateSectorBusiness


Revenue
Period End2021-06-302021-03-312020-06-302020-03-31
Value11010293100
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax2.22.12.12.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax2.22.12.12.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cdw:Services cdw:CorporateSegmentPrivateSectorBusiness100.0100.0100.0100.0

cdw:Services, cdw:PublicSegmentGovernmentAgenciesEducationandHealthcare


Revenue
Period End2021-06-302021-03-312020-06-302020-03-31
Value70576667
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.41.21.51.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.41.21.51.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cdw:Services cdw:PublicSegmentGovernmentAgenciesEducationandHealthcare100.0100.0100.0100.0

cdw:Services, cdw:SmallBusiness


Revenue
Period End2021-06-302021-03-312020-06-302020-03-31
Value11107.18.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.20.20.20.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.20.20.20.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cdw:Services cdw:SmallBusiness100.0100.0100.0100.0

cdw:Services, us-gaap:AllOtherSegments


Revenue
Period End2021-06-302021-03-312020-06-302020-03-31
Value59634854
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.21.31.11.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.21.31.11.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cdw:Services us-gaap:AllOtherSegments100.0100.0100.0100.0

cdw:SoftwareProducts, cdw:CorporateSegmentPrivateSectorBusiness


Revenue
Period End2021-06-302021-03-312020-06-302020-03-31
Value267267238272
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax5.25.55.56.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax5.25.55.56.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cdw:SoftwareProducts cdw:CorporateSegmentPrivateSectorBusiness100.0100.0100.0100.0

cdw:SoftwareProducts, cdw:PublicSegmentGovernmentAgenciesEducationandHealthcare


Revenue
Period End2021-06-302021-03-312020-06-302020-03-31
Value242194222235
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax4.74.05.15.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax4.74.05.15.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cdw:SoftwareProducts cdw:PublicSegmentGovernmentAgenciesEducationandHealthcare100.0100.0100.0100.0

cdw:SoftwareProducts, cdw:SmallBusiness


Revenue
Period End2021-06-302021-03-312020-06-302020-03-31
Value49494252
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.01.01.01.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.01.01.01.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cdw:SoftwareProducts cdw:SmallBusiness100.0100.0100.0100.0

cdw:SoftwareProducts, us-gaap:AllOtherSegments


Revenue
Period End2021-06-302021-03-312020-06-302020-03-31
Value78996893
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.52.01.62.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.52.01.62.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cdw:SoftwareProducts us-gaap:AllOtherSegments100.0100.0100.0100.0

cdw:TotalHardware, cdw:CorporateSegmentPrivateSectorBusiness


Revenue
Period End2021-06-302021-03-312020-06-302020-03-31
Value1586142012111517
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax30.829.427.834.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax30.829.427.834.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cdw:TotalHardware cdw:CorporateSegmentPrivateSectorBusiness100.0100.0100.0100.0

cdw:TotalHardware, cdw:PublicSegmentGovernmentAgenciesEducationandHealthcare


Revenue
Period End2021-06-302021-03-312020-06-302020-03-31
Value1763166417241214
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax34.334.439.527.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax34.334.439.527.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cdw:TotalHardware cdw:PublicSegmentGovernmentAgenciesEducationandHealthcare100.0100.0100.0100.0

cdw:TotalHardware, cdw:SmallBusiness


Revenue
Period End2021-06-302021-03-312020-06-302020-03-31
Value416368247325
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax8.17.65.77.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax8.17.65.77.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cdw:TotalHardware cdw:SmallBusiness100.0100.0100.0100.0

cdw:TotalHardware, us-gaap:AllOtherSegments


Revenue
Period End2021-06-302021-03-312020-06-302020-03-31
Value458511365411
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax8.910.68.49.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax8.910.68.49.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cdw:TotalHardware us-gaap:AllOtherSegments100.0100.0100.0100.0

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:StatementBusinessSegments

cdw:CorporateSegmentPrivateSectorBusiness


Revenue
Period End2021-06-302021-03-312020-06-302020-03-31
Value1983180515571911
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax38.537.335.743.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax38.537.335.743.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cdw:CorporateSegmentPrivateSectorBusiness100.0100.0100.0100.0

cdw:Public


Revenue
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value2296229320221525159321001840133014141875163512301426169316321153
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax46.348.246.334.835.142.839.733.634.742.939.134.138.043.142.035.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax46.348.246.334.835.142.839.733.634.742.939.134.138.043.142.035.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cdw:Public100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cdw:PublicSegmentGovernmentAgenciesEducationandHealthcare


Revenue
Period End2021-06-302021-03-312020-06-302020-03-31
Value2080192120221525
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax40.439.746.334.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax40.439.746.334.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cdw:PublicSegmentGovernmentAgenciesEducationandHealthcare100.0100.0100.0100.0

cdw:SmallBusiness


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value482432366337302391391386377355362340329327308305315292
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax9.48.97.47.16.98.98.67.98.29.08.97.87.99.18.27.88.19.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax9.48.97.47.16.98.98.67.98.29.08.97.87.99.18.27.88.19.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cdw:SmallBusiness100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AllOtherSegments


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value599677575465484561587507528535461451487483418381363369
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax11.614.011.69.811.112.812.910.311.413.511.310.311.613.411.29.79.311.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax11.614.011.69.811.112.812.910.311.413.511.310.311.613.411.29.79.311.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:AllOtherSegments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:Corporate


Revenue
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value1717166015571911196519131883173618361706173315651599155215801440
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax34.734.935.743.543.339.040.743.945.139.041.443.442.639.540.644.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax34.734.935.743.543.339.040.743.945.139.041.443.442.639.540.644.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:Corporate100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:StatementBusinessSegments, us-gaap:TimingOfTransferOfGoodOrService

cdw:CorporateSegmentPrivateSectorBusiness, cdw:TransferredAtPointInTimeAgent


Revenue
Period End2021-06-302021-03-312020-06-302020-03-31
Value120112112107
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax2.32.32.62.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax2.32.32.62.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cdw:CorporateSegmentPrivateSectorBusiness cdw:TransferredAtPointInTimeAgent100.0100.0100.0100.0

cdw:CorporateSegmentPrivateSectorBusiness, cdw:TransferredAtPointInTimePrincipal


Revenue
Period End2021-06-302021-03-312020-06-302020-03-31
Value1789162713871741
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax34.833.631.839.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax34.833.631.839.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cdw:CorporateSegmentPrivateSectorBusiness cdw:TransferredAtPointInTimePrincipal100.0100.0100.0100.0

cdw:CorporateSegmentPrivateSectorBusiness, cdw:TransferredOverTimePrincipal


Revenue
Period End2021-06-302021-03-312020-06-302020-03-31
Value73655862
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.41.41.31.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.41.41.31.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cdw:CorporateSegmentPrivateSectorBusiness cdw:TransferredOverTimePrincipal100.0100.0100.0100.0

cdw:PublicSegmentGovernmentAgenciesEducationandHealthcare, cdw:TransferredAtPointInTimeAgent


Revenue
Period End2021-06-302021-03-312020-06-302020-03-31
Value85586852
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.71.21.61.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.71.21.61.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cdw:PublicSegmentGovernmentAgenciesEducationandHealthcare cdw:TransferredAtPointInTimeAgent100.0100.0100.0100.0

cdw:PublicSegmentGovernmentAgenciesEducationandHealthcare, cdw:TransferredAtPointInTimePrincipal


Revenue
Period End2021-06-302021-03-312020-06-302020-03-31
Value1953182518541404
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax38.037.742.532.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax38.037.742.532.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cdw:PublicSegmentGovernmentAgenciesEducationandHealthcare cdw:TransferredAtPointInTimePrincipal100.0100.0100.0100.0

cdw:PublicSegmentGovernmentAgenciesEducationandHealthcare, cdw:TransferredOverTimePrincipal


Revenue
Period End2021-06-302021-03-312020-06-302020-03-31
Value42379968
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.80.82.31.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.80.82.31.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cdw:PublicSegmentGovernmentAgenciesEducationandHealthcare cdw:TransferredOverTimePrincipal100.0100.0100.0100.0

cdw:SmallBusiness, cdw:TransferredAtPointInTimeAgent


Revenue
Period End2021-06-302021-03-312020-06-302020-03-31
Value25261822
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.50.60.40.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.50.60.40.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cdw:SmallBusiness cdw:TransferredAtPointInTimeAgent100.0100.0100.0100.0

cdw:SmallBusiness, cdw:TransferredAtPointInTimePrincipal


Revenue
Period End2021-06-302021-03-312020-06-302020-03-31
Value451402280366
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax8.88.36.48.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax8.88.36.48.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cdw:SmallBusiness cdw:TransferredAtPointInTimePrincipal100.0100.0100.0100.0

cdw:SmallBusiness, cdw:TransferredOverTimePrincipal


Revenue
Period End2021-06-302021-03-312020-06-302020-03-31
Value5.43.82.52.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.10.10.10.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.10.10.10.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cdw:SmallBusiness cdw:TransferredOverTimePrincipal100.0100.0100.0100.0

us-gaap:AllOtherSegments, cdw:TransferredAtPointInTimeAgent


Revenue
Period End2021-06-302021-03-312020-06-302020-03-31
Value19231413
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.40.50.30.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.40.50.30.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:AllOtherSegments cdw:TransferredAtPointInTimeAgent100.0100.0100.0100.0

us-gaap:AllOtherSegments, cdw:TransferredAtPointInTimePrincipal


Revenue
Period End2021-06-302021-03-312020-06-302020-03-31
Value527600426499
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax10.212.49.811.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax10.212.49.811.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:AllOtherSegments cdw:TransferredAtPointInTimePrincipal100.0100.0100.0100.0

us-gaap:AllOtherSegments, cdw:TransferredOverTimePrincipal


Revenue
Period End2021-06-302021-03-312020-06-302020-03-31
Value52534349
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.01.11.01.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.01.11.01.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:AllOtherSegments cdw:TransferredOverTimePrincipal100.0100.0100.0100.0

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:StatementGeographical

country:US


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value454441624382429538703830395244054108342736183926370431313338355635332891
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax88.386.088.490.388.787.387.189.888.786.688.889.888.586.889.090.490.888.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax88.386.088.490.388.787.387.189.888.786.688.889.888.586.889.090.490.888.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax country:US100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:NonUs


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value601675574461494558584502521530456447481475413376358364
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax11.714.011.69.711.312.712.910.211.313.411.210.211.513.211.09.69.211.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax11.714.011.69.711.312.712.910.211.313.411.210.211.513.211.09.69.211.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:NonUs100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:StatementGeographical, us-gaap:StatementBusinessSegments

country:US, cdw:CorporateSegmentPrivateSectorBusiness


Revenue
Period End2021-06-302021-03-312020-06-302020-03-31
Value1976180315421907
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax38.437.335.343.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax38.437.335.343.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax country:US cdw:CorporateSegmentPrivateSectorBusiness100.0100.0100.0100.0

country:US, cdw:PublicSegmentGovernmentAgenciesEducationandHealthcare


Revenue
Period End2021-06-302021-03-312020-06-302020-03-31
Value2080192120221525
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax40.439.746.334.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax40.439.746.334.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax country:US cdw:PublicSegmentGovernmentAgenciesEducationandHealthcare100.0100.0100.0100.0

country:US, cdw:SmallBusiness


Revenue
Period End2021-06-302021-03-312020-06-302020-03-31
Value482432302391
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax9.48.96.98.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax9.48.96.98.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax country:US cdw:SmallBusiness100.0100.0100.0100.0

country:US, us-gaap:AllOtherSegments


Revenue
Period End2021-06-302021-03-312020-06-302020-03-31
Value4.74.63.86.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.10.10.10.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.10.10.10.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax country:US us-gaap:AllOtherSegments100.0100.0100.0100.0

us-gaap:NonUs, cdw:CorporateSegmentPrivateSectorBusiness


Revenue
Period End2021-06-302021-03-312020-06-302020-03-31
Value7.12.1143.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.10.00.30.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.10.00.30.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:NonUs cdw:CorporateSegmentPrivateSectorBusiness100.0100.0100.0100.0

us-gaap:NonUs, us-gaap:AllOtherSegments


Revenue
Period End2021-06-302021-03-312020-06-302020-03-31
Value594672480555
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax11.613.911.012.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax11.613.911.012.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:NonUs us-gaap:AllOtherSegments100.0100.0100.0100.0

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:TimingOfTransferOfGoodOrService

cdw:TransferredAtPointInTimeAgent


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value251220241245214195208225217183191179183165149158167141
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax4.94.64.95.24.94.44.64.64.74.64.74.14.44.64.04.04.34.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax4.94.64.95.24.94.44.64.64.74.64.74.14.44.64.04.04.34.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cdw:TransferredAtPointInTimeAgent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cdw:TransferredAtPointInTimePrincipal


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value472144564519427639484011417244904254363537394060387133403476365035993027
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax91.792.191.289.990.491.492.091.591.991.891.892.892.592.692.792.892.593.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax91.792.191.289.990.491.492.091.591.991.891.892.892.592.692.792.892.593.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cdw:TransferredAtPointInTimePrincipal100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cdw:TransferredOverTimePrincipal


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value17316019523420318215519115813914313413010012612412487
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax3.43.33.94.94.74.23.43.93.43.53.53.13.12.83.43.23.22.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax3.43.33.94.94.74.23.43.93.43.53.53.13.12.83.43.23.22.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cdw:TransferredOverTimePrincipal100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Revenues

us-gaap:Revenues

us-gaap:Revenues


Revenues
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value514648374956475643654389453649074629395740744373418636063752393338913256349237083664311634183501331427553050326631062652271328642779241126012623258423192479258124122129226923742223
Percentage of Revenues100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Selling General And Administrative Expense

us-gaap:SellingGeneralAndAdministrativeExpense

us-gaap:SellingGeneralAndAdministrativeExpense


Selling
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value512471548507463510443444420404402390381362347352363347336334344329338321290275290285273260270332266251261257259251266252244229242235239
Percentage of SellingGeneralAndAdministrativeExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax10.09.811.110.710.611.69.89.19.110.29.98.99.110.19.38.99.310.79.69.09.410.69.99.28.810.09.58.78.89.810.011.69.610.410.09.810.010.810.79.810.110.810.79.910.8

Assets

us-gaap:Assets

us-gaap:Assets


Assets
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value899090539344922387498222799977037921767971677375733070276956710170416774694867726887671767556741625160886099610760455912592460386020582257005985593557215949596560215943
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Liabilities And Stockholders Equity

us-gaap:LiabilitiesAndStockholdersEquity

us-gaap:LiabilitiesAndStockholdersEquity


Liabilities
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value899090539344922387498222799977037921767971677375733070276956710170416774694867726887671767556741625160886099610760455912592460386020582257005985593557215949596560215943
Percentage of LiabilitiesAndStockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Stockholders Equity

us-gaap:StockholdersEquity

us-gaap:StockholdersEquity


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-312009-12-312008-12-31
Value104811701297123810558899609359369279751160106899698280684990710459901013103910951075995975936894844754711659209163136985110-7.3-35.5-69.3-43.5-44.7262
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets11.712.913.913.412.110.812.012.111.812.113.615.714.614.214.111.412.113.415.014.614.715.516.216.015.916.015.414.614.012.812.010.93.52.82.41.60.90.2-0.1-0.6-1.2-0.70.00.0

us-gaap:StockholdersEquity us-gaap:CumulativeEffectPeriodOfAdoption

srt:CumulativeEffectPeriodOfAdoptionAdjustment


Stockholders
Period End2020-12-312019-12-31
Value190.5
Percentage of StockholdersEquity1.50.1
Percentage of Assets0.20.0
Percentage of Assets srt:CumulativeEffectPeriodOfAdoptionAdjustment0.00.0

us-gaap:StockholdersEquity us-gaap:CumulativeEffectPeriodOfAdoption, us-gaap:StatementEquityComponents

srt:CumulativeEffectPeriodOfAdoptionAdjustment, us-gaap:RetainedEarnings


Stockholders
Period End2020-12-312019-12-31
Value190.5
Percentage of StockholdersEquity1.50.1
Percentage of Assets0.20.0
Percentage of Assets srt:CumulativeEffectPeriodOfAdoptionAdjustment us-gaap:RetainedEarnings0.00.0

us-gaap:StockholdersEquity us-gaap:StatementEquityComponents

us-gaap:AccumulatedOtherComprehensiveIncome


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-312009-12-312008-12-31
Value-83.2-89.1-95.8-130.7-151.6-159.3-117.8-154.1-139.4-127.5-130.6-108.2-105.1-78.5-95.9-101.7-115.8-133.5-139.6-115.8-104.0-68.9-61.1-45.3-22.9-27.6-16.6-11.7-6.5-10.2-6.3-3.3-5.3-2.00.41.3-1.8-0.2-2.1-4.42.7-2.2-21.3-73.2
Percentage of StockholdersEquity-7.9-7.6-7.4-10.6-14.4-17.9-12.3-16.5-14.9-13.7-13.4-9.3-9.8-7.9-9.8-12.6-13.6-14.7-13.4-11.7-10.3-6.6-5.6-4.2-2.3-2.8-1.8-1.3-0.8-1.4-0.9-0.5-2.5-1.20.31.3-3.5-1.928.812.4-3.95.147.7-27.9
Percentage of Assets-0.9-1.0-1.0-1.4-1.7-1.9-1.5-2.0-1.8-1.7-1.8-1.5-1.4-1.1-1.4-1.4-1.6-2.0-2.0-1.7-1.5-1.0-0.9-0.7-0.4-0.5-0.3-0.2-0.1-0.2-0.1-0.1-0.1-0.00.00.0-0.0-0.0-0.0-0.10.0-0.00.00.0
Percentage of Assets us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AdditionalPaidInCapital


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-312009-12-312008-12-31
Value32943262320431613138311430953073304730252996297029532928291129032890287428572843283128172806279327292718271127042698269126882685221122102209220221962191218621792175216621552140
Percentage of StockholdersEquity314.1278.8247.1255.3297.3350.1322.3328.6325.6326.2307.3256.0276.3293.8296.2360.1340.4316.8273.3287.1279.4270.9256.1259.7274.1278.7289.6302.5319.4356.6377.7407.11057.91349.61618.42243.34299.020674.5-29946.6-6138.0-3138.8-4980.9-4821.9816.5
Percentage of Assets36.636.034.334.335.937.938.739.938.539.441.840.340.341.741.940.941.042.441.142.041.141.941.641.443.744.744.544.344.645.545.444.536.738.038.836.837.038.336.736.536.136.50.00.0
Percentage of Assets us-gaap:AdditionalPaidInCapital0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:CommonStock


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302012-12-312011-12-312010-12-312009-12-31
Value1.41.41.41.41.41.41.41.41.51.51.51.51.51.51.51.51.51.61.61.61.61.71.71.71.71.71.71.71.71.71.71.71.41.41.41.41.4
Percentage of StockholdersEquity0.10.10.10.10.10.20.10.10.20.20.20.10.10.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.30.71.0-19.2-3.2-3.1
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets us-gaap:CommonStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:RetainedEarnings


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-312009-12-312008-12-31
Value-2163.5-2004.6-1813.4-1794.0-1932.5-2067.3-2018.6-1985.4-1973.6-1972.0-1892.6-1703.5-1780.8-1854.6-1834.3-1997.2-1927.1-1835.4-1673.8-1738.9-1715.3-1710.0-1651.6-1674.6-1712.5-1717.5-1760.5-1800.6-1848.9-1928.2-1971.8-2024.4-1998.1-2044.8-2073.0-2106.0-2143.9-2180.7-2191.3-2210.1-2247.2-2208.0-2178.8-1805.4
Percentage of StockholdersEquity-206.3-171.3-139.8-144.9-183.1-232.4-210.2-212.3-210.8-212.7-194.1-146.8-166.6-186.0-186.6-247.6-227.0-202.3-160.1-175.6-169.3-164.4-150.7-155.7-172.0-176.1-188.0-201.4-218.9-255.5-277.1-306.8-956.0-1248.4-1518.7-2144.6-4195.5-20572.630017.86225.63242.75075.94874.3-688.6
Percentage of Assets-24.1-22.1-19.4-19.4-22.1-25.1-25.2-25.8-24.9-25.7-26.4-23.1-24.3-26.4-26.4-28.1-27.4-27.1-24.1-25.7-24.9-25.5-24.4-24.8-27.4-28.2-28.9-29.5-30.6-32.6-33.3-33.5-33.2-35.1-36.4-35.2-36.1-38.1-36.8-37.1-37.3-37.10.00.0
Percentage of Assets us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Assets Current

us-gaap:AssetsCurrent

us-gaap:AssetsCurrent


Assets
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value542154695953575952354665433442954425413237963949384434793378349233963097323829973075281627902734271424852453251624152247221322852233198618142060196417011879186218661702
Percentage of AssetsCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets60.360.463.762.459.856.754.255.855.953.853.053.552.549.548.649.248.245.746.644.344.641.941.340.643.440.840.241.240.038.037.437.937.134.131.834.433.129.731.631.231.028.6

Cash And Cash Equivalents At Carrying Value

us-gaap:CashAndCashEquivalentsAtCarryingValue

us-gaap:CashAndCashEquivalentsAtCarryingValue


Cash
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302009-12-312008-12-31
Value50187814101249958214154166194285205255100221144977925126311812924837973354473443572273061883501791473719315836992544733667268894
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 Assets5.69.715.113.511.02.61.92.22.53.72.93.51.43.12.11.41.13.73.81.71.93.70.61.45.47.35.65.93.85.23.25.83.02.50.73.22.70.61.70.40.70.00.60.00.00.00.0

Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents


Cash
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-31
Value50187814101249958214154166194290205255100221144263
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets5.69.715.113.511.02.61.92.22.53.82.93.51.43.12.13.8

Accounts Receivable Net Current

us-gaap:AccountsReceivableNetCurrent

us-gaap:AccountsReceivableNetCurrent


Accounts
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value337032343212326730293149300228992967272526712650261222742320231123351985216820192082178020171860171214481561147315261335145113101390126412651277123810931254125711781091
Percentage of AccountsReceivableNetCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets37.535.734.435.434.638.337.537.637.535.537.335.935.632.433.432.533.229.331.229.830.226.529.927.627.423.825.624.125.222.624.521.723.121.722.221.320.919.121.121.119.618.4

Inventory Net

us-gaap:InventoryNet

us-gaap:InventoryNet


Inventory
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value888745760648694672611603652590454481576485449549513493452451487460393411436357337423449388382353378358314346321346321315348292
Percentage of InventoryNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets9.98.28.17.07.98.27.67.88.27.76.36.57.96.96.57.77.37.36.56.77.16.95.86.17.05.95.56.97.46.66.45.96.36.25.55.85.46.15.45.35.84.9

Prepaid Expense And Other Assets Current

us-gaap:PrepaidExpenseAndOtherAssetsCurrent

us-gaap:PrepaidExpenseAndOtherAssetsCurrent


Prepaid
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value2302151911901991871711932051781491921811881271531311271181381151141441354158548652534663108513451634534485635
Percentage of PrepaidExpenseAndOtherAssetsCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets2.62.42.02.12.32.32.12.52.62.32.12.62.52.71.82.21.91.91.72.01.71.72.12.00.71.00.91.40.90.90.81.01.80.90.60.91.10.80.60.80.90.6

Machinery And Equipment Gross

us-gaap:MachineryAndEquipmentGross

us-gaap:MachineryAndEquipmentGross


Machinery
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value43454445435654535048
Percentage of MachineryAndEquipmentGross100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.50.60.60.70.60.80.90.90.90.8

Property Plant And Equipment Gross

us-gaap:PropertyPlantAndEquipmentGross

us-gaap:PropertyPlantAndEquipmentGross


Property
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value419620371362348374309310302294
Percentage of PropertyPlantAndEquipmentGross100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets4.57.85.25.25.05.55.15.25.34.9

Furniture And Fixtures Gross

us-gaap:FurnitureAndFixturesGross

us-gaap:FurnitureAndFixturesGross


Furniture
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value21201822232921212120
Percentage of FurnitureAndFixturesGross100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.20.30.30.30.30.40.40.40.40.3

Construction In Progress Gross

us-gaap:ConstructionInProgressGross

us-gaap:ConstructionInProgressGross


Construction
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value50232417202324101117
Percentage of ConstructionInProgressGross100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.50.30.30.30.30.40.40.20.20.3

Property Plant And Equipment Net

us-gaap:PropertyPlantAndEquipmentNet

us-gaap:PropertyPlantAndEquipmentNet


Property
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value176175175268326331363171163155156147150153161162160162163162163168175154134135137131129129131129132134142139142146154147150158
Percentage of PropertyPlantAndEquipmentNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets2.01.91.92.93.74.04.52.22.12.02.22.02.12.22.32.32.32.42.42.42.42.52.62.32.12.22.22.22.12.22.22.12.22.32.52.32.42.62.62.52.52.7

Goodwill

us-gaap:Goodwill

us-gaap:Goodwill


Goodwill
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value273128122595257325322529255325152524252824622469247224882479247724692459245524672475249525002517221522152217221822202219222022222207220822092209220822092208220722102209
Percentage of Goodwill100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets30.431.127.827.928.930.831.932.731.932.934.433.533.735.435.634.935.136.335.336.435.937.137.037.335.436.436.436.336.737.537.536.836.737.938.836.937.238.637.137.036.737.2

us-gaap:Goodwill us-gaap:StatementBusinessSegments

cdw:Public


Goodwillus-gaap:
Period End2021-06-302021-03-312020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value10591142929929929929929911911911907907907
Percentage of Goodwill38.840.635.836.437.737.537.936.441.141.041.141.141.1
Percentage of Assets11.812.69.911.613.013.413.413.514.915.415.915.215.3
Percentage of Assets cdw:Public0.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AllOtherSegments


Goodwillus-gaap:
Period End2021-06-302021-03-312020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value3623603563462732902653577477797878
Percentage of Goodwill13.312.813.713.611.111.710.814.33.43.53.63.53.6
Percentage of Assets4.04.03.84.33.84.23.85.31.21.31.41.31.3
Percentage of Assets us-gaap:AllOtherSegments0.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:Corporate


Goodwillus-gaap:
Period End2021-06-302021-03-312020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-31
Value112311231123109010741074107410451045
Percentage of Goodwill41.140.043.342.743.643.343.841.847.2
Percentage of Assets12.512.412.013.615.015.415.515.517.1
Percentage of Assets us-gaap:Corporate0.00.00.00.00.00.00.00.00.0

Intangible Assets Net Excluding Goodwill

us-gaap:IntangibleAssetsNetExcludingGoodwill

us-gaap:IntangibleAssetsNetExcludingGoodwill


Intangible
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value4874194454614925405946166606967127588028598979379761015105511101162122512761325108911281168120712471286132813651403144314781516155715991636167217121791
Percentage of IntangibleAssetsNetExcludingGoodwill100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets5.44.64.85.05.66.67.48.08.39.19.910.310.912.212.913.213.915.015.216.416.918.218.919.717.418.519.219.820.621.822.422.623.324.825.925.326.228.027.528.028.430.1

Finite Lived Intangible Assets Net

us-gaap:FiniteLivedIntangibleAssetsNet

us-gaap:FiniteLivedIntangibleAssetsNet


Finite
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value445594712897105512761168132814781636
Percentage of FiniteLivedIntangibleAssetsNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets4.87.49.912.915.218.919.222.425.927.5

us-gaap:FiniteLivedIntangibleAssetsNet us-gaap:FiniteLivedIntangibleAssetsByMajorClass

cdw:CustomerRelationshipsandContracts


Finite
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-31
Value203324445616761966
Percentage of FiniteLivedIntangibleAssetsNet45.754.762.668.772.275.7
Percentage of Assets2.24.16.28.911.014.3
Percentage of Assets cdw:CustomerRelationshipsandContracts0.00.00.00.00.00.0

us-gaap:OtherIntangibleAssets


Finite
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value4.22.01.52.11.92.91.01.21.71.8
Percentage of FiniteLivedIntangibleAssetsNet0.90.30.20.20.20.20.10.10.10.1
Percentage of Assets0.00.00.00.00.00.00.00.00.00.0
Percentage of Assets us-gaap:OtherIntangibleAssets0.00.00.00.00.00.00.00.00.00.0

us-gaap:SoftwareAndSoftwareDevelopmentCosts


Finite
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value941038073645851483733
Percentage of FiniteLivedIntangibleAssetsNet21.317.411.38.16.14.64.43.72.52.1
Percentage of Assets1.01.31.11.00.90.90.80.80.70.6
Percentage of Assets us-gaap:SoftwareAndSoftwareDevelopmentCosts0.00.00.00.00.00.00.00.00.00.0

us-gaap:TradeNames


Finite
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value142163184205226248269290311332
Percentage of FiniteLivedIntangibleAssetsNet32.127.625.923.021.519.523.021.821.020.3
Percentage of Assets1.52.02.63.03.33.74.44.95.55.6
Percentage of Assets us-gaap:TradeNames0.00.00.00.00.00.00.00.00.00.0

Operating Lease Right Of Use Asset

us-gaap:OperatingLeaseRightOfUseAsset

us-gaap:OperatingLeaseRightOfUseAsset


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value124128130133137129131841171320.0
Percentage of OperatingLeaseRightOfUseAsset100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0
Percentage of Assets1.41.41.41.41.61.61.61.11.51.70.0

Other Assets Noncurrent

us-gaap:OtherAssetsNoncurrent

us-gaap:OtherAssetsNoncurrent


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value49484327242523203035395060474032384036341112129.42.22.63.22.11.61.51.61.41.61.21.61.62.02.12.32.22.22.2
Percentage of OtherAssetsNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.50.50.50.30.30.30.30.30.40.50.60.70.80.70.60.50.50.60.50.50.20.20.20.10.00.00.10.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Accrued Income Taxes Current

us-gaap:AccruedIncomeTaxesCurrent

us-gaap:AccruedIncomeTaxesCurrent


Accrued
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value801621046814513588515910155112256153112270.01219510.01.715470.20.219486.30.05.6170.27.29.2110.06.75.44.2
Percentage of AccruedIncomeTaxesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0
Percentage of Assets0.91.81.10.71.71.61.10.70.81.30.80.20.30.80.20.40.20.40.00.20.30.80.00.00.20.80.00.00.30.80.10.00.10.30.00.10.20.20.00.10.10.1

Contract With Customer Liability Current

us-gaap:ContractWithCustomerLiabilityCurrent

us-gaap:ContractWithCustomerLiabilityCurrent


Contract
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-31
Value325326243246275257252212200192178188169193158143
Percentage of ContractWithCustomerLiabilityCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets3.63.62.62.73.13.13.22.82.52.52.52.62.32.82.32.1

Liabilities Current

us-gaap:LiabilitiesCurrent

us-gaap:LiabilitiesCurrent


Liabilities
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value377037093898383635613647349132413460321528032803282025822514255825552222228021262177194318871871162514251468152715291418140214961445131211481316129711071341117210911026
Percentage of LiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets41.941.041.741.640.744.443.642.143.741.939.138.038.536.736.136.036.332.832.831.431.628.927.927.826.023.424.125.025.324.023.724.824.022.520.122.021.919.422.519.718.117.3

Long Term Debt Current

us-gaap:LongTermDebtCurrent

us-gaap:LongTermDebtCurrent


Long
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-31
Value19197072373334252525253238252541181818182626272715151515151545170130.0400.00.00.0201
Percentage of LongTermDebtCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.00.00.00.0100.0
Percentage of Assets0.20.20.80.80.40.40.40.30.30.30.40.40.50.40.40.60.30.30.30.30.40.40.40.40.20.30.30.30.30.30.82.80.20.00.70.00.00.03.4

Operating Lease Liability Current

us-gaap:OperatingLeaseLiabilityCurrent

us-gaap:OperatingLeaseLiabilityCurrent


Operating
Period End2020-12-312019-12-31
Value2530
Percentage of OperatingLeaseLiabilityCurrent100.0100.0
Percentage of Assets0.30.4

Other Accrued Liabilities Current

us-gaap:OtherAccruedLiabilitiesCurrent

us-gaap:OtherAccruedLiabilitiesCurrent


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value34239842449150654849129135034623220921220418018416115514915915213416612811311311311111310513011691939685879192878387
Percentage of OtherAccruedLiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets3.84.44.55.35.86.76.13.84.44.53.22.82.92.92.62.62.32.32.22.32.22.02.51.91.81.91.91.81.91.82.21.91.51.61.71.41.51.61.61.51.41.5

Other Liabilities Current

us-gaap:OtherLiabilitiesCurrent

us-gaap:OtherLiabilitiesCurrent


Other
Period End2020-12-312019-12-312018-12-312017-12-31
Value424491232243
Percentage of OtherLiabilitiesCurrent100.0100.0100.0100.0
Percentage of Assets4.56.13.23.5

Liabilities Noncurrent

us-gaap:LiabilitiesNoncurrent

us-gaap:LiabilitiesNoncurrent


Liabilities
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value417241734149414841323685354735273525353733893410344134483459373636373644362236553696373437723793362936873695368536713739381038824366434644154570458646034615482750004960
Percentage of LiabilitiesNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets46.446.144.445.047.244.844.345.844.546.147.346.246.949.149.752.651.753.852.154.053.755.655.856.358.160.660.660.360.763.264.364.372.574.677.576.477.380.577.680.983.083.5

Long Term Debt Noncurrent

us-gaap:LongTermDebtNoncurrent

us-gaap:LongTermDebtNoncurrent


Long
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-31
Value390939113856385838613438328332593253325731833187320132093210338832773262321532223214322532323240315431903174314631103157320532393710368037313871387138713865
Percentage of LongTermDebtNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets43.543.241.341.844.141.841.042.341.142.444.443.243.745.746.147.746.548.146.347.646.748.047.948.150.552.452.051.551.553.454.153.661.663.265.564.765.267.765.0

Deferred Income Tax Liabilities Net

us-gaap:DeferredIncomeTaxLiabilitiesNet

us-gaap:DeferredIncomeTaxLiabilitiesNet


Deferred
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value33295563676262111123132141158172188196
Percentage of DeferredIncomeTaxLiabilitiesNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.40.30.60.70.80.80.81.41.61.72.02.12.42.72.8

Other Liabilities Noncurrent

us-gaap:OtherLiabilitiesNoncurrent

us-gaap:OtherLiabilitiesNoncurrent


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value686868756555717562536465664952323032373961617057474645444241414050495260585745444840
Percentage of OtherLiabilitiesNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.80.80.70.80.70.70.91.00.80.70.90.90.90.70.80.50.40.50.50.60.90.91.00.90.80.80.80.70.70.70.70.70.80.80.91.01.01.00.80.70.80.7

Operating Lease Liability Noncurrent

us-gaap:OperatingLeaseLiabilityNoncurrent

us-gaap:OperatingLeaseLiabilityNoncurrent


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value1611651691511381291318186930.0
Percentage of OperatingLeaseLiabilityNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0
Percentage of Assets1.81.81.81.61.61.61.61.11.11.20.0

Lessee Operating Lease Liability Payments Due Year Two

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo


Lessee
Period End2020-12-31
Value26
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearTwo100.0
Percentage of Assets0.3

Lessee Operating Lease Liability Payments Due Year Three

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree


Lessee
Period End2020-12-31
Value22
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearThree100.0
Percentage of Assets0.2

Lessee Operating Lease Liability Payments Due Year Four

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour


Lessee
Period End2020-12-31
Value19
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearFour100.0
Percentage of Assets0.2

Lessee Operating Lease Liability Payments Due Year Five

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive


Lessee
Period End2020-12-31
Value18
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearFive100.0
Percentage of Assets0.2

Lessee Operating Lease Liability Payments Due After Year Five

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive


Lessee
Period End2020-12-31
Value123
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive100.0
Percentage of Assets1.3

Operating Lease Liability

us-gaap:OperatingLeaseLiability

us-gaap:OperatingLeaseLiability


Operating
Period End2020-12-312019-12-312019-09-302019-06-302019-03-31
Value194161112158170
Percentage of OperatingLeaseLiability100.0100.0100.0100.0100.0
Percentage of Assets2.12.01.52.02.2

Lessee Operating Lease Liability Payments Due

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue


Lessee
Period End2020-12-31
Value243
Percentage of LesseeOperatingLeaseLiabilityPaymentsDue100.0
Percentage of Assets2.6

Lessee Operating Lease Liability Undiscounted Excess Amount

us-gaap:LesseeOperatingLeaseLiabilityUndiscountedExcessAmount

us-gaap:LesseeOperatingLeaseLiabilityUndiscountedExcessAmount


Lessee
Period End2020-12-31
Value48
Percentage of LesseeOperatingLeaseLiabilityUndiscountedExcessAmount100.0
Percentage of Assets0.5

Stockholders Equity

us-gaap:StockholdersEquity

us-gaap:StockholdersEquity


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-312009-12-312008-12-31
Value104811701297123810558899609359369279751160106899698280684990710459901013103910951075995975936894844754711659209163136985110-7.3-35.5-69.3-43.5-44.7262
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets11.712.913.913.412.110.812.012.111.812.113.615.714.614.214.111.412.113.415.014.614.715.516.216.015.916.015.414.614.012.812.010.93.52.82.41.60.90.2-0.1-0.6-1.2-0.70.00.0

us-gaap:StockholdersEquity us-gaap:CumulativeEffectPeriodOfAdoption

srt:CumulativeEffectPeriodOfAdoptionAdjustment


Stockholders
Period End2020-12-312019-12-31
Value190.5
Percentage of StockholdersEquity1.50.1
Percentage of Assets0.20.0
Percentage of Assets srt:CumulativeEffectPeriodOfAdoptionAdjustment0.00.0

us-gaap:StockholdersEquity us-gaap:CumulativeEffectPeriodOfAdoption, us-gaap:StatementEquityComponents

srt:CumulativeEffectPeriodOfAdoptionAdjustment, us-gaap:RetainedEarnings


Stockholders
Period End2020-12-312019-12-31
Value190.5
Percentage of StockholdersEquity1.50.1
Percentage of Assets0.20.0
Percentage of Assets srt:CumulativeEffectPeriodOfAdoptionAdjustment us-gaap:RetainedEarnings0.00.0

us-gaap:StockholdersEquity us-gaap:StatementEquityComponents

us-gaap:AccumulatedOtherComprehensiveIncome


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-312009-12-312008-12-31
Value-83.2-89.1-95.8-130.7-151.6-159.3-117.8-154.1-139.4-127.5-130.6-108.2-105.1-78.5-95.9-101.7-115.8-133.5-139.6-115.8-104.0-68.9-61.1-45.3-22.9-27.6-16.6-11.7-6.5-10.2-6.3-3.3-5.3-2.00.41.3-1.8-0.2-2.1-4.42.7-2.2-21.3-73.2
Percentage of StockholdersEquity-7.9-7.6-7.4-10.6-14.4-17.9-12.3-16.5-14.9-13.7-13.4-9.3-9.8-7.9-9.8-12.6-13.6-14.7-13.4-11.7-10.3-6.6-5.6-4.2-2.3-2.8-1.8-1.3-0.8-1.4-0.9-0.5-2.5-1.20.31.3-3.5-1.928.812.4-3.95.147.7-27.9
Percentage of Assets-0.9-1.0-1.0-1.4-1.7-1.9-1.5-2.0-1.8-1.7-1.8-1.5-1.4-1.1-1.4-1.4-1.6-2.0-2.0-1.7-1.5-1.0-0.9-0.7-0.4-0.5-0.3-0.2-0.1-0.2-0.1-0.1-0.1-0.00.00.0-0.0-0.0-0.0-0.10.0-0.00.00.0
Percentage of Assets us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AdditionalPaidInCapital


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-312009-12-312008-12-31
Value32943262320431613138311430953073304730252996297029532928291129032890287428572843283128172806279327292718271127042698269126882685221122102209220221962191218621792175216621552140
Percentage of StockholdersEquity314.1278.8247.1255.3297.3350.1322.3328.6325.6326.2307.3256.0276.3293.8296.2360.1340.4316.8273.3287.1279.4270.9256.1259.7274.1278.7289.6302.5319.4356.6377.7407.11057.91349.61618.42243.34299.020674.5-29946.6-6138.0-3138.8-4980.9-4821.9816.5
Percentage of Assets36.636.034.334.335.937.938.739.938.539.441.840.340.341.741.940.941.042.441.142.041.141.941.641.443.744.744.544.344.645.545.444.536.738.038.836.837.038.336.736.536.136.50.00.0
Percentage of Assets us-gaap:AdditionalPaidInCapital0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:CommonStock


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302012-12-312011-12-312010-12-312009-12-31
Value1.41.41.41.41.41.41.41.41.51.51.51.51.51.51.51.51.51.61.61.61.61.71.71.71.71.71.71.71.71.71.71.71.41.41.41.41.4
Percentage of StockholdersEquity0.10.10.10.10.10.20.10.10.20.20.20.10.10.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.30.71.0-19.2-3.2-3.1
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets us-gaap:CommonStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:RetainedEarnings


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-312009-12-312008-12-31
Value-2163.5-2004.6-1813.4-1794.0-1932.5-2067.3-2018.6-1985.4-1973.6-1972.0-1892.6-1703.5-1780.8-1854.6-1834.3-1997.2-1927.1-1835.4-1673.8-1738.9-1715.3-1710.0-1651.6-1674.6-1712.5-1717.5-1760.5-1800.6-1848.9-1928.2-1971.8-2024.4-1998.1-2044.8-2073.0-2106.0-2143.9-2180.7-2191.3-2210.1-2247.2-2208.0-2178.8-1805.4
Percentage of StockholdersEquity-206.3-171.3-139.8-144.9-183.1-232.4-210.2-212.3-210.8-212.7-194.1-146.8-166.6-186.0-186.6-247.6-227.0-202.3-160.1-175.6-169.3-164.4-150.7-155.7-172.0-176.1-188.0-201.4-218.9-255.5-277.1-306.8-956.0-1248.4-1518.7-2144.6-4195.5-20572.630017.86225.63242.75075.94874.3-688.6
Percentage of Assets-24.1-22.1-19.4-19.4-22.1-25.1-25.2-25.8-24.9-25.7-26.4-23.1-24.3-26.4-26.4-28.1-27.4-27.1-24.1-25.7-24.9-25.5-24.4-24.8-27.4-28.2-28.9-29.5-30.6-32.6-33.3-33.5-33.2-35.1-36.4-35.2-36.1-38.1-36.8-37.1-37.3-37.10.00.0
Percentage of Assets us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Common Stock Value

us-gaap:CommonStockValue

us-gaap:CommonStockValue


Common
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302012-12-312011-12-31
Value1400000.01400000.01400000.01400000.01400000.01400000.01400000.01400000.01500000.01500000.01500000.01500000.01500000.01500000.01500000.01500000.01500000.01600000.01600000.01600000.01600000.01700000.01700000.01700000.01700000.01700000.01700000.01700000.01700000.01700000.01700000.01700000.01400000.01400000.01400000.0
Percentage of CommonStockValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Additional Paid In Capital Common Stock

us-gaap:AdditionalPaidInCapitalCommonStock

us-gaap:AdditionalPaidInCapitalCommonStock


Additional
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value329432623204316131383114309530733047302529962970295329282911290328902874285728432831281728062793272927182711270426982691268826852211221022092202219621912186217921752166
Percentage of AdditionalPaidInCapitalCommonStock100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets36.636.034.334.335.937.938.739.938.539.441.840.340.341.741.940.941.042.441.142.041.141.941.641.443.744.744.544.344.645.545.444.536.738.038.836.837.038.336.736.536.136.5

Retained Earnings Accumulated Deficit

us-gaap:RetainedEarningsAccumulatedDeficit

us-gaap:RetainedEarningsAccumulatedDeficit


Retained
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value-2163.5-2004.6-1813.4-1794.0-1932.5-2067.3-2018.6-1985.4-1973.6-1972.0-1892.6-1703.5-1780.8-1854.6-1834.3-1997.2-1927.1-1835.4-1673.8-1738.9-1715.3-1710.0-1651.6-1674.6-1712.5-1717.5-1760.5-1800.6-1848.9-1928.2-1971.8-2024.4-1998.1-2044.8-2073.0-2106.0-2143.9-2180.7-2191.3-2210.1-2247.2-2208.0
Percentage of RetainedEarningsAccumulatedDeficit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets-24.1-22.1-19.4-19.4-22.1-25.1-25.2-25.8-24.9-25.7-26.4-23.1-24.3-26.4-26.4-28.1-27.4-27.1-24.1-25.7-24.9-25.5-24.4-24.8-27.4-28.2-28.9-29.5-30.6-32.6-33.3-33.5-33.2-35.1-36.4-35.2-36.1-38.1-36.8-37.1-37.3-37.1

us-gaap:RetainedEarningsAccumulatedDeficit us-gaap:StatementScenario, us-gaap:AdjustmentsForNewAccountingPronouncements

srt:ScenarioForecast, us-gaap:AccountingStandardsUpdate201912


Retained
Period End2021-01-01
Value19
Percentage of RetainedEarningsAccumulatedDeficit0.0
Percentage of Assets0.0
Percentage of Assets srt:ScenarioForecast us-gaap:AccountingStandardsUpdate2019120.0

Accumulated Other Comprehensive Income Loss Net Of Tax

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax


Accumulated
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value-83200000.0-89100000.0-95800000.0-130700000.0-151600000.0-159300000.0-117800000.0-154100000.0-139400000.0-127500000.0-130600000.0-108200000.0-105100000.0-78500000.0-95900000.0-101700000.0-115800000.0-133500000.0-139600000.0-115800000.0-104000000.0-68900000.0-61100000.0-45300000.0-22900000.0-27600000.0-16600000.0-11700000.0-6500000.0-10200000.0-6300000.0-3300000.0-5300000.0-2000000.0400000.01300000.0-1800000.0-200000.0-2100000.0-4400000.02700000.0-2200000.0
Percentage of AccumulatedOtherComprehensiveIncomeLossNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets-0.9-1.0-1.0-1.4-1.7-1.9-1.5-2.0-1.8-1.7-1.8-1.5-1.4-1.1-1.4-1.4-1.6-2.0-2.0-1.7-1.5-1.0-0.9-0.7-0.4-0.5-0.3-0.2-0.1-0.2-0.1-0.1-0.1-0.00.00.0-0.0-0.0-0.0-0.10.0-0.0

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

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue


Adjustments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-30
Value201516115.68.810121112109.99.07.18.68.610109.88.58.26.79.96.27.54.74.93.94.33.32.3402.11.94.16.5
Percentage of AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital


Adjustments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-30
Value201516115.68.810121112109.99.07.18.68.610109.88.58.26.79.96.27.54.74.93.94.33.32.3402.11.94.16.5
Percentage of AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets us-gaap:AdditionalPaidInCapital0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Net Cash Provided By Used In Operating Activities

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInOperatingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value0.3344575222292223344267162252303270110222338626.3369104186-114.5427-17.4195-78.717784174-70.4246-4.5163-0.9208-49.7628122343-35.96514159103
Percentage of NetCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.07.111.64.76.75.17.65.53.56.47.56.22.66.29.01.60.211.43.05.0-3.113.7-0.55.6-2.46.52.85.3-2.39.3-0.25.7-0.08.6-1.92.43.29.61.7-1.42.76.62.64.4

Net Cash Provided By Used In Investing Activities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value19-233.6-28.9-72.1-74.6-25.4-181.4-31.1-30.8-88.1-32.7-19.8-17.7-15.9-22.5-21.8-17.2-19.6-22.4-17.8-14.7-11.0-46.2-284.8-12.9-10.5-108.8-14.1-11.7-30.2-16.6-10.5-11.2-8.8-16.3-9.7-7.4-8.3-19.8-9.7-10.3-16.2-42.5-27.1
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.4-4.8-0.6-1.5-1.7-0.6-4.0-0.6-0.7-2.2-0.8-0.5-0.4-0.4-0.6-0.6-0.4-0.6-0.6-0.5-0.4-0.4-1.4-8.1-0.4-0.4-3.6-0.4-0.4-1.1-0.6-0.4-0.4-0.4-0.6-0.4-0.3-0.4-0.8-0.4-0.4-0.8-1.9-1.1

Net Cash Provided By Used In Financing Activities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value-399.0-643.5-392.90000000000003137524-130.0-181.3-263.3-225.0-80.2-319.5-97.1-207.0-131.2-271.1-20.9-164.5-362.266-178.213-206.43.4-146.8-20.4-62.711-29.02.3-97.0-140.91645-89.5-88.7-19.248-278.44928-84.5-88.8-48.1-35.8
Percentage of NetCashProvidedByUsedInFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-7.8-13.3-7.92.912.0-3.0-4.0-5.4-4.9-2.0-7.8-2.2-4.9-3.6-7.2-0.5-4.2-11.11.9-4.80.4-6.60.1-4.2-0.6-2.30.4-0.90.1-3.7-5.20.61.6-3.7-3.4-0.71.9-12.02.01.1-3.5-4.2-2.1-1.5

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

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect


Cash
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value-377.4-531.616029174460-12.9-27.6-96.284-49.3154
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-7.3-11.03.26.117.01.4-0.3-0.6-2.12.1-1.23.5

Depreciation Depletion And Amortization

us-gaap:DepreciationDepletionAndAmortization

us-gaap:DepreciationDepletionAndAmortization


Depreciation
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-30
Value464576132125916968656466656666656565646363636462595252525152525152525251535352515150
Percentage of DepreciationDepletionAndAmortization100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DepreciationDepletionAndAmortization us-gaap:ConsolidationItems

us-gaap:CorporateNonSegment


Depreciation
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value1718151820171818-16.3172321202020202019191818
Percentage of DepreciationDepletionAndAmortization37.140.719.614.216.419.327.026.4-25.126.635.432.730.830.531.131.231.731.030.129.328.9

us-gaap:DepreciationDepletionAndAmortization us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, cdw:CorporateSegmentPrivateSectorBusiness


Depreciation
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value3.84.06.42222222221-21.6211920202120202020412020
Percentage of DepreciationDepletionAndAmortization8.28.88.416.917.724.431.831.8-33.233.429.730.930.831.731.431.731.832.464.932.832.5

us-gaap:OperatingSegments, cdw:PublicSegmentGovernmentAgenciesEducationandHealthcare


Depreciation
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value1613457769371415-13.7121111111111111111111111
Percentage of DepreciationDepletionAndAmortization34.529.659.758.355.241.221.422.0-21.119.817.017.517.016.817.017.017.117.417.617.717.4

us-gaap:OperatingSegments, cdw:SmallBusiness


Depreciation
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value0.80.81.35.65.65.85.75.6-5.65.65.25.25.25.25.35.25.15.15.15.15.2
Percentage of DepreciationDepletionAndAmortization1.71.81.74.24.56.38.28.2-8.68.77.87.97.87.88.17.97.87.98.08.18.2

us-gaap:OperatingSegments, us-gaap:AllOtherSegments


Depreciation
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value8.68.68.28.47.98.08.17.9-7.87.46.77.39.08.88.28.07.67.27.57.68.3
Percentage of DepreciationDepletionAndAmortization18.519.010.76.36.38.811.611.6-12.011.510.011.113.613.212.512.211.611.211.812.013.0

Increase Decrease In Accounts Receivable

us-gaap:IncreaseDecreaseInAccountsReceivable

us-gaap:IncreaseDecreaseInAccountsReceivable


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value12415-78.5224-128.620973-58.3242-11.93039355-60.58.0-35.9340-184.6162-57.0312-237.616420263-105.491-49.5188-113.2142-81.0127-18.8-11.637145-162.3-3.382100-14.2-29.70.4
Percentage of IncreaseDecreaseInAccountsReceivable100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Increase Decrease In Inventories

us-gaap:IncreaseDecreaseInInventories

us-gaap:IncreaseDecreaseInInventories


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value143-15.437-55.122661.9-46.263134-25.3-95.69572-99.03217403.9-34.43068-23.3-44.17919-85.9-25.9616.528-24.82043-32.225-25.1256.5-33.54015-12.1-7.7
Percentage of IncreaseDecreaseInInventories100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Net Cash Provided By Used In Operating Activities

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInOperatingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value0.3344575222292223344267162252303270110222338626.3369104186-114.5427-17.4195-78.717784174-70.4246-4.5163-0.9208-49.7628122343-35.96514159103
Percentage of NetCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.07.111.64.76.75.17.65.53.56.47.56.22.66.29.01.60.211.43.05.0-3.113.7-0.55.6-2.46.52.85.3-2.39.3-0.25.7-0.08.6-1.92.43.29.61.7-1.42.76.62.64.4

Net Income Loss

us-gaap:NetIncomeLoss

us-gaap:NetIncomeLoss


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value274232238193189167185201196152159183173127195129141571031251177789150108545155865060-2.24628333836101937-34.8-4.2-24.1-0.3-7.0
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax5.34.84.84.14.33.84.14.14.23.93.94.24.13.55.23.33.61.83.03.43.22.52.64.33.32.01.71.72.81.92.2-0.11.71.21.31.41.40.50.81.4-1.4-0.2-1.1-0.0-0.3

us-gaap:NetIncomeLoss us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-30
Value274232238193189167185201196152159183173127195129141571031251177789150108545155865060-2.24628333836101937
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.099.9100.1100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax5.34.84.84.14.33.84.14.14.23.93.94.24.13.55.23.33.61.83.03.43.22.52.64.33.32.01.71.72.81.92.2-0.11.71.21.31.41.40.50.81.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Net Cash Provided By Used In Investing Activities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value19-233.6-28.9-72.1-74.6-25.4-181.4-31.1-30.8-88.1-32.7-19.8-17.7-15.9-22.5-21.8-17.2-19.6-22.4-17.8-14.7-11.0-46.2-284.8-12.9-10.5-108.8-14.1-11.7-30.2-16.6-10.5-11.2-8.8-16.3-9.7-7.4-8.3-19.8-9.7-10.3-16.2-42.5-27.1
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.4-4.8-0.6-1.5-1.7-0.6-4.0-0.6-0.7-2.2-0.8-0.5-0.4-0.4-0.6-0.6-0.4-0.6-0.6-0.5-0.4-0.4-1.4-8.1-0.4-0.4-3.6-0.4-0.4-1.1-0.6-0.4-0.4-0.4-0.6-0.4-0.3-0.4-0.8-0.4-0.4-0.8-1.9-1.1

Payments To Acquire Property Plant And Equipment

us-gaap:PaymentsToAcquirePropertyPlantAndEquipment

us-gaap:PaymentsToAcquirePropertyPlantAndEquipment


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-31
Value17202433742516131241932191715222117192215141146211210.020
Percentage of PaymentsToAcquirePropertyPlantAndEquipment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Net Cash Provided By Used In Financing Activities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value-399.0-643.5-392.90000000000003137524-130.0-181.3-263.3-225.0-80.2-319.5-97.1-207.0-131.2-271.1-20.9-164.5-362.266-178.213-206.43.4-146.8-20.4-62.711-29.02.3-97.0-140.91645-89.5-88.7-19.248-278.44928-84.5-88.8-48.1-35.8
Percentage of NetCashProvidedByUsedInFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-7.8-13.3-7.92.912.0-3.0-4.0-5.4-4.9-2.0-7.8-2.2-4.9-3.6-7.2-0.5-4.2-11.11.9-4.80.4-6.60.1-4.2-0.6-2.30.4-0.90.1-3.7-5.20.61.6-3.7-3.4-0.71.9-12.02.01.1-3.5-4.2-2.1-1.5

Proceeds From Issuance Of Long Term Debt

us-gaap:ProceedsFromIssuanceOfLongTermDebt

us-gaap:ProceedsFromIssuanceOfLongTermDebt


Proceeds
Period End2020-12-312020-09-302019-12-312019-09-302018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value0.07000.06000.00.00.00.00.00.00.020830.014830.00.00.00.00.05255756000.00.00.018813460.00.00.00.01350.00.011750.0
Percentage of ProceedsFromIssuanceOfLongTermDebt0.0100.00.0100.00.00.00.00.00.00.00.0100.00.0100.00.00.00.00.00.0100.0100.0100.00.00.00.0100.0100.00.00.00.00.0100.00.00.0100.00.0

Repayments Of Long Term Debt

us-gaap:RepaymentsOfLongTermDebt

us-gaap:RepaymentsOfLongTermDebt


Repayments
Period End2021-06-302021-03-312019-12-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-31
Value3.2420.90.00.00.00.00.00.00.021210.014900.00.00.00.00.052557560044791615331299531060.00.01360.0-1043.011750.00.0
Percentage of RepaymentsOfLongTermDebt100.0100.0100.00.00.00.00.00.00.00.0100.00.0100.00.00.00.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.0100.00.0100.0100.00.00.0

Payments Of Dividends Common Stock

us-gaap:PaymentsOfDividendsCommonStock

us-gaap:PaymentsOfDividendsCommonStock


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value5556575454545442424343313132322424252517171818111111117.37.37.37.30.00.00.0
Percentage of PaymentsOfDividendsCommonStock100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.00.0

Payments For Repurchase Of Common Stock

us-gaap:PaymentsForRepurchaseOfCommonStock

us-gaap:PaymentsForRepurchaseOfCommonStock


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-03-31
Value3763581990.00.014016316115517728956671090.01741841751213110511848101910.00.00.00.00.00.10.00.00.10.30.10.00.30.0
Percentage of PaymentsForRepurchaseOfCommonStock100.0100.0100.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.00.00.00.0100.00.00.0100.0100.0100.00.0100.00.0

Debt Instrument Interest Rate Stated Percentage

us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:DebtInstrument, us-gaap:LongtermDebtType

us-gaap:DebtInstrumentInterestRateStatedPercentage

cdw:SeniorNotesDue2029, us-gaap:UnsecuredDebt


Debt
Period End2020-08-13
Value3.25
Percentage of DebtInstrumentInterestRateStatedPercentage100.0
Percentage of LongTermDebtAndCapitalLeaseObligations0.0
Percentage of LongTermDebtAndCapitalLeaseObligations cdw:SeniorNotesDue2029 us-gaap:UnsecuredDebt0.0

us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:LongtermDebtType

cdw:SeniorNotesDueSeptember2025


Debt
Period End2020-08-13
Value5.0
Percentage of DebtInstrumentInterestRateStatedPercentage153.8
Percentage of LongTermDebtAndCapitalLeaseObligations0.0
Percentage of LongTermDebtAndCapitalLeaseObligations cdw:SeniorNotesDueSeptember20250.0

cdw:SeniorNotesdue2025


Debt
Period End2020-08-132017-12-31
Value5.00.05
Percentage of DebtInstrumentInterestRateStatedPercentage153.80.0
Percentage of LongTermDebtAndCapitalLeaseObligations0.00.0
Percentage of LongTermDebtAndCapitalLeaseObligations cdw:SeniorNotesdue20250.00.0

Effective Income Tax Rate Continuing Operations

us-gaap:EffectiveIncomeTaxRateContinuingOperations

us-gaap:EffectiveIncomeTaxRateContinuingOperations


Effective
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-30
Value26.219.522.70.2290.207-0.0040.2270.2470.202-0.0020.2290.2470.234-0.1030.3750.2790.217-0.0010.3650.3730.372-0.0020.387-0.0040.3790.3690.37-0.0340.5460.3620.364-0.0190.3980.3840.2790.580.3230.347
Percentage of EffectiveIncomeTaxRateContinuingOperations100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

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

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice


Share
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312014-09-302014-06-302014-03-312013-12-312012-12-31
Value73.7159.3946.8237.4129.3625.5820.7520.7220.6520.5717.00
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0

Deferred Tax Liabilities

us-gaap:DeferredTaxLiabilities

us-gaap:DeferredTaxLiabilities


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312017-09-302016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value4058141196315369474475565610667
Percentage of DeferredTaxLiabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Unrecognized Tax Benefits

us-gaap:UnrecognizedTaxBenefits

us-gaap:UnrecognizedTaxBenefits


Unrecognized
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value1817150.00.00.00.00.00.00.00.011
Percentage of UnrecognizedTaxBenefits100.0100.0100.00.00.00.00.00.00.00.00.0100.0

Deferred Tax Assets Valuation Allowance

us-gaap:DeferredTaxAssetsValuationAllowance

us-gaap:DeferredTaxAssetsValuationAllowance


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value161617151.20.00.00.00.00.0
Percentage of DeferredTaxAssetsValuationAllowance100.0100.0100.0100.0100.00.00.00.00.00.0

cdw:NetChangeInAccountsPayableInventoryFinancing

cdw:NetChangeInAccountsPayableInventoryFinancing


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value30-180.3-139.5180133-81.416-53.7-33.9702220-135.324-42.64350-135.7104-32.1137-66.573-18.683-42.332-11.961-6.431-57.3293.715-19.148-74.0541053554
Percentage of NetChangeInAccountsPayableInventoryFinancing100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cdw:RevenuenetbyProductandServicePercentage

cdw:RevenuenetbyProductandServicePercentage


Revenuenetby
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value100.0100.00100.01.01.001.01.01.001.01.01.001.01.01.0
Percentage of RevenuenetbyProductandServicePercentage100.0100.00.0100.0100.0100.00.0100.0100.0100.00.0100.0100.0100.00.0100.0100.0100.0

cdw:RevenuenetbyProductandServicePercentage us-gaap:ProductOrService

cdw:Desktops


Revenuenetby
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value5.75.5-0.45.20.0580.0880.0010.0910.0930.07700.0780.0820.084-0.0030.0780.0790.081
Percentage of RevenuenetbyProductandServicePercentage5.75.50.05.25.88.80.09.19.37.70.07.88.28.40.07.87.98.1

cdw:EnterpriseAndDataStorageIncludingDrives


Revenuenetby
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value4.75.405.20.0460.0550.0010.0580.0590.0730.0010.0670.0630.071-0.0020.0710.0750.072
Percentage of RevenuenetbyProductandServicePercentage4.75.40.05.24.65.50.05.85.97.30.06.76.37.10.07.17.57.2

cdw:NetcommProducts


Revenuenetby
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value9.49.4-0.211.10.1080.10400.1160.1220.1290.0030.1330.1190.134-0.0050.1380.1390.141
Percentage of RevenuenetbyProductandServicePercentage9.49.40.011.110.810.40.011.612.212.90.013.311.913.40.013.813.914.1

cdw:NotebooksMobileDevices


Revenuenetby
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value33.232.90.729.10.3270.253-0.0050.270.2660.24700.2550.2550.238-0.0050.2450.2350.226
Percentage of RevenuenetbyProductandServicePercentage33.232.90.029.132.725.30.027.026.624.70.025.525.523.80.024.523.522.6

cdw:OtherHardware


Revenuenetby
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value21.122.10.422.50.2150.2150.0020.1930.1890.198-0.0070.2080.2110.208-0.0040.2080.20.219
Percentage of RevenuenetbyProductandServicePercentage21.122.10.022.521.521.50.019.318.919.80.020.821.120.80.020.820.021.9

cdw:OtherProductsAndServices


Revenuenetby
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value0.60.60.20.70.0070.008-0.0010.0070.0070.00700.0060.0070.008-0.0010.0080.0070.008
Percentage of RevenuenetbyProductandServicePercentage0.60.60.00.70.70.80.00.70.70.70.00.60.70.80.00.80.70.8

cdw:Services


Revenuenetby
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value4.94.8-0.24.80.0490.0530.0010.050.0480.050.0010.0410.040.045-0.0010.040.0390.043
Percentage of RevenuenetbyProductandServicePercentage4.94.80.04.84.95.30.05.04.85.00.04.14.04.50.04.03.94.3

cdw:SoftwareProducts


Revenuenetby
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value12.412.6-0.414.80.1330.1520.0020.1430.1410.150.0030.1390.1450.140.0240.1380.1520.138
Percentage of RevenuenetbyProductandServicePercentage12.412.60.014.813.315.20.014.314.115.00.013.914.514.00.013.815.213.8

cdw:TotalHardware


Revenuenetby
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value82.182.00.479.70.8110.787-0.0020.80.8040.793-0.0040.8140.8080.807-0.0220.8140.8020.811
Percentage of RevenuenetbyProductandServicePercentage82.182.00.079.781.178.70.080.080.479.30.081.480.880.70.081.480.281.1

cdw:Video


Revenuenetby
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value8.06.7-0.16.60.0570.072-0.0010.0720.0750.069-0.0010.0730.0780.072-0.0030.0740.0740.072
Percentage of RevenuenetbyProductandServicePercentage8.06.70.06.65.77.20.07.27.56.90.07.37.87.20.07.47.47.2

us-gaap:AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation

us-gaap:AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation


Adjustments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value0.0270.40.20.0210.19.70.0116.8180.08.7
Percentage of AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation0.0100.0100.0100.00.0100.0100.0100.00.0100.0100.0100.00.0100.0

us-gaap:AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings


Adjustments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value0.0270.40.20.0210.19.70.01114180.08.7
Percentage of AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation0.0100.0100.0100.00.0100.0100.0100.00.0100.0211.8100.00.0100.0

us-gaap:AdvertisingExpense

us-gaap:AdvertisingExpense


Advertising
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value51474845495153394848483745464635444142343941382937373428353331303336312935282929332824
Percentage of AdvertisingExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths us-gaap:DerivativeInstrumentRisk

us-gaap:CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths

us-gaap:InterestRateContract


Cash
Period End2020-12-31
Value2000000.0
Percentage of CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths100.0

us-gaap:CommonStockDividendsPerShareCashPaid

us-gaap:CommonStockDividendsPerShareCashPaid


Common
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value0.40.40.380.380.380.380.2950.2950.2950.2950.210.210.210.210.160.160.160.160.10750.10750.10750.10750.06750.06750.06750.06750.042542500.00.04250.0425000
Percentage of CommonStockDividendsPerShareCashPaid100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.00.0

us-gaap:ContractWithCustomerLiabilityRevenueRecognized

us-gaap:ContractWithCustomerLiabilityRevenueRecognized


Contract
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value509746-53.0333-123.0194.03974276-37.0-174.058239-27.0-144.045
Percentage of ContractWithCustomerLiabilityRevenueRecognized100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DebtInstrumentPeriodicPaymentPrincipal us-gaap:LongtermDebtType

us-gaap:DebtInstrumentPeriodicPaymentPrincipal

cdw:SeniorSecuredTermLoanFacility


Debt
Period End2021-06-302021-03-312020-12-31
Value04000000.00
Percentage of DebtInstrumentPeriodicPaymentPrincipal0.0100.00.0

us-gaap:DebtInstrumentRedemptionPricePercentageOfPrincipalAmountRedeemed us-gaap:LongtermDebtType

us-gaap:DebtInstrumentRedemptionPricePercentageOfPrincipalAmountRedeemed

cdw:SeniorNotesDueSeptember2025


Debt
Period End2020-08-13
Value103.75
Percentage of DebtInstrumentRedemptionPricePercentageOfPrincipalAmountRedeemed100.0

us-gaap:DepreciationAmortizationAndAccretionNet

us-gaap:DepreciationAmortizationAndAccretionNet


Depreciation
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value464576132125916968656466656666656565646363636462595252525152525152525251535352515150515053
Percentage of DepreciationAmortizationAndAccretionNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DividendsCommonStock

us-gaap:DividendsCommonStock


Dividends
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value5556575454545442424343313132322425252517171818111111117.37.37.3
Percentage of DividendsCommonStock100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DividendsCommonStock us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital


Dividends
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value-0.3-0.3-0.3-0.3-0.3-0.2-0.3-0.2-0.2-0.2-0.3-0.2-0.2-0.1-0.1-0.2-0.2-0.2-0.1-0.1-0.1-0.20.00.00.00.00.00.00.00.0
Percentage of DividendsCommonStock-0.5-0.5-0.5-0.6-0.6-0.4-0.6-0.5-0.5-0.5-0.7-0.6-0.6-0.3-0.3-0.8-0.8-0.8-0.4-0.6-0.6-1.10.00.00.00.00.00.00.00.0

us-gaap:RetainedEarnings


Dividends
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value5656575454545442434344313232322425252517171818111111117.37.37.3
Percentage of DividendsCommonStock100.5100.5100.5100.6100.6100.4100.6100.5100.5100.5100.7100.6100.6100.3100.3100.8100.8100.8100.4100.6100.6101.1100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents

us-gaap:EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents


Effect
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value1800000.0900000.06600000.03200000.01500000.0-7200000.04900000.0-1000000.0-2500000.0800000.0-700000.01300000.0-5700000.01700000.0
Percentage of EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate

us-gaap:EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate


Effective
Period End2021-03-31
Value21.0
Percentage of EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate100.0

us-gaap:GoodwillAcquiredDuringPeriod us-gaap:BusinessAcquisition

us-gaap:GoodwillAcquiredDuringPeriod

cdw:AmplifiedITLLC


Goodwill
Period End2021-03-31
Value212
Percentage of GoodwillAcquiredDuringPeriod100.0

cdw:OtherAcquisition


Goodwill
Period End2021-03-31
Value0.2
Percentage of GoodwillAcquiredDuringPeriod0.1

us-gaap:GoodwillAcquiredDuringPeriod us-gaap:BusinessAcquisition, us-gaap:StatementBusinessSegments

cdw:AmplifiedITLLC, cdw:Public


Goodwill
Period End2021-03-31
Value212
Percentage of GoodwillAcquiredDuringPeriod100.0

cdw:OtherAcquisition, us-gaap:Corporate


Goodwill
Period End2021-03-31
Value0.2
Percentage of GoodwillAcquiredDuringPeriod0.1

us-gaap:GoodwillForeignCurrencyTranslationGainLoss

us-gaap:GoodwillForeignCurrencyTranslationGainLoss


Goodwill
Period End2021-06-302021-03-31
Value2.13.4
Percentage of GoodwillForeignCurrencyTranslationGainLoss100.0100.0

us-gaap:GoodwillForeignCurrencyTranslationGainLoss us-gaap:StatementBusinessSegments

us-gaap:AllOtherSegments


Goodwill
Period End2021-06-302021-03-31
Value2.13.4
Percentage of GoodwillForeignCurrencyTranslationGainLoss100.0100.0

us-gaap:IncreaseDecreaseInAccountsPayableTrade

us-gaap:IncreaseDecreaseInAccountsPayableTrade


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-30
Value144-37.2146108-159.5157-69.9-150.9298116-29.4-86.2416-29.891-171.6322-10.483-77.812891-125.574158-7.0-71.4-31.312421-8.7-99.0
Percentage of IncreaseDecreaseInAccountsPayableTrade100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInDeferredIncomeTaxes

us-gaap:IncreaseDecreaseInDeferredIncomeTaxes


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value-0.43.5179.8-4.7-2.654118.813161114131171421192224242522
Percentage of IncreaseDecreaseInDeferredIncomeTaxes100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInOtherOperatingAssets

us-gaap:IncreaseDecreaseInOtherOperatingAssets


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value3835-28.929-83.063-71.3-27.47731-91.33.977-15.4-62.95810020-51.15653-9.4-30.581-3.023-51.050-6.225-62.15.04719-39.4-2.12322-56.6-9.324-9.032-10.2
Percentage of IncreaseDecreaseInOtherOperatingAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInOtherOperatingLiabilities

us-gaap:IncreaseDecreaseInOtherOperatingLiabilities


Increase
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-30
Value-141.5126-49.6-64.3103-3.7-22.67150-17.55995
Percentage of IncreaseDecreaseInOtherOperatingLiabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InterestRateCashFlowHedgeGainLossReclassifiedToEarningsNet us-gaap:DerivativeInstrumentRisk

us-gaap:InterestRateCashFlowHedgeGainLossReclassifiedToEarningsNet

us-gaap:Derivative


Interest
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value-1900000.0-1600000.0-1400000.0-1000000.00-300000.0-200000.0-2000000.08000000.0-1000000.0-1000000.01000000.001000000.001000000.04000000.0-1000000.001000000.0
Percentage of InterestRateCashFlowHedgeGainLossReclassifiedToEarningsNet100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.00.0100.00.0100.0100.0100.00.0100.0

us-gaap:OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent

us-gaap:OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-30
Value5.36.333196.3-42.435-14.6-8.09.9-14.8-3.2-28.9144.213186.5-23.8-11.9-35.0-7.8-15.8-22.44.7-11.0-4.9-5.23.7-3.9-3.02.0-3.3-2.4-0.93.1-1.61.92.3-7.10.5
Percentage of OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent

us-gaap:OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent


Other
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value5.36.3196.3-42.4-14.6-8.09.9-3.2-28.914
Percentage of OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent us-gaap:StatementEquityComponents

us-gaap:AccumulatedOtherComprehensiveIncome


Other
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value5.36.3196.3-42.4-14.6-8.09.9-3.2-28.914
Percentage of OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax


Other
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value0.0-0.40.0-0.21.5-0.4-4.1-8.3
Percentage of OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax0.0100.00.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax us-gaap:DerivativeInstrumentRisk

us-gaap:InterestRateContract


Other
Period End2020-12-312020-09-302020-06-302019-12-312019-09-302019-06-302019-03-31
Value0.00.40.0-23.80.44.1-8.0
Percentage of OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax0.0-100.00.0-1586.7-100.0-100.096.4

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax us-gaap:StatementEquityComponents

us-gaap:AccumulatedOtherComprehensiveIncome


Other
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value0.0-0.40.0-0.21.5-0.4-4.1-8.3
Percentage of OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax0.0100.00.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value-600000.0-400000.0-1900000.0-1600000.0-1400000.0-1100000.0300000.0-300000.0-200000.0-1500000.0
Percentage of OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax us-gaap:StatementEquityComponents

us-gaap:AccumulatedOtherComprehensiveIncome


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value-600000.0-400000.0-1900000.0-1600000.0-1400000.01100000.0300000.0-300000.0-200000.01500000.0
Percentage of OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax100.0100.0100.0100.0100.0-100.0100.0100.0100.0-100.0

us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent

us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value5.96.734207.7-41.536-14.7-11.93.1-22.4-3.1-26.6175.814176.1-23.8-11.9-35.0-7.8-15.8-22.44.7-11.0-4.9-5.23.7-3.9-3.02.0-3.3-2.4-0.93.1-1.61.9
Percentage of OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherOperatingActivitiesCashFlowStatement

us-gaap:OtherOperatingActivitiesCashFlowStatement


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value-33.62.63.7315.41.43.8183.62.82.23.65.2-0.10.30.3-2.32.1-0.10.50.00.0-0.70.71.11.3
Percentage of OtherOperatingActivitiesCashFlowStatement100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.0100.0100.0100.0100.0

us-gaap:PaymentsOfDebtExtinguishmentCosts

us-gaap:PaymentsOfDebtExtinguishmentCosts


Payments
Period End2021-06-302021-03-312019-12-31
Value0.0560.9
Percentage of PaymentsOfDebtExtinguishmentCosts0.0100.0100.0

us-gaap:PaymentsRelatedToTaxWithholdingForShareBasedCompensation

us-gaap:PaymentsRelatedToTaxWithholdingForShareBasedCompensation


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312014-12-312014-09-302013-12-312013-09-30
Value0.0270.40.20.0210.19.70.0116.8180.08.77.60.023180.00.00.00.00.8
Percentage of PaymentsRelatedToTaxWithholdingForShareBasedCompensation0.0100.0100.0100.00.0100.0100.0100.00.0100.0100.0100.00.0100.0100.00.0100.0100.00.00.00.00.0100.0

us-gaap:PaymentsToAcquireBusinessesNetOfCashAcquired

us-gaap:PaymentsToAcquireBusinessesNetOfCashAcquired


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312016-12-312015-12-312014-12-31
Value-1.32124.5380.00.0200.06.3680.00.00.00.00.00.00.0
Percentage of PaymentsToAcquireBusinessesNetOfCashAcquired100.0100.0100.0100.00.00.0100.00.0100.0100.00.00.00.00.00.00.00.0

us-gaap:ProceedsFromLinesOfCredit

us-gaap:ProceedsFromLinesOfCredit


Proceeds
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value0.0560.00.024378158596980288-2.2200318170281121123446.722642632091050.00.00.00.00.00.0630.0330.0108148305235448307370151
Percentage of ProceedsFromLinesOfCredit0.0100.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.00.00.00.00.0100.00.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProceedsFromPaymentsForOtherFinancingActivities

us-gaap:ProceedsFromPaymentsForOtherFinancingActivities


Proceeds
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value2.6-15.34.0-16.07.26.80.82.0101127-1.32.80.4-0.2-0.5-0.4-0.2-0.30.5-0.3-0.50.00.00.00.0
Percentage of ProceedsFromPaymentsForOtherFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.00.00.0

us-gaap:ProceedsFromStockOptionsExercised

us-gaap:ProceedsFromStockOptionsExercised


Proceeds
Period End2021-06-302021-03-312020-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value4.1377.14.5127.33.91.73.04.41.42.22.61.20.70.70.50.50.20.30.70.10.00.00.00.0
Percentage of ProceedsFromStockOptionsExercised100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.00.00.0

us-gaap:ProvisionForDoubtfulAccounts

us-gaap:ProvisionForDoubtfulAccounts


Provision
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302014-12-312014-09-302013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value-4.7-1.30.53.3-2.129-1.30.21.40.50.1-2.12.30.00.00.00.30.00.00.00.00.00.00.00.0-0.40.4-0.50.00.90.00.00.0
Percentage of ProvisionForDoubtfulAccounts100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.00.0100.00.00.00.00.00.00.00.00.0100.0100.0100.00.0100.00.00.00.0

us-gaap:RepaymentsOfLinesOfCredit

us-gaap:RepaymentsOfLinesOfCredit


Repayments
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value0.0504056195601019802124.820730417047310737.66.16.722642632091050.00.00.00.00.00.0630.0330.0108148310390464318373215
Percentage of RepaymentsOfLinesOfCredit0.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.00.00.00.00.0100.00.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans us-gaap:StatementEquityComponents

us-gaap:StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans

us-gaap:CommonStock


Stock
Period End2021-06-302018-12-312018-09-302018-06-30
Value100000.000100000.0
Percentage of StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans100.00.00.0100.0

us-gaap:StockIssuedDuringPeriodSharesStockOptionsExercised us-gaap:StatementEquityComponents

us-gaap:StockIssuedDuringPeriodSharesStockOptionsExercised

us-gaap:CommonStock


Stock
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value0900000.0500000.0200000.0300000.0400000.0300000.0300000.0200000.0500000.0100000.00400000.0300000.0
Percentage of StockIssuedDuringPeriodSharesStockOptionsExercised0.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0

us-gaap:StockIssuedDuringPeriodValueEmployeeStockPurchasePlan

us-gaap:StockIssuedDuringPeriodValueEmployeeStockPurchasePlan


Stock
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-30
Value6.53.94.04.54.83.53.73.94.33.03.43.03.02.42.72.92.62.12.42.42.61.92.22.32.51.72.11.7
Percentage of StockIssuedDuringPeriodValueEmployeeStockPurchasePlan100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StockIssuedDuringPeriodValueEmployeeStockPurchasePlan us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital


Stock
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-30
Value6.53.94.04.54.83.53.73.94.33.03.43.03.02.42.72.92.62.12.42.42.61.92.22.32.51.72.11.7
Percentage of StockIssuedDuringPeriodValueEmployeeStockPurchasePlan100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StockIssuedDuringPeriodValueStockOptionsExercised

us-gaap:StockIssuedDuringPeriodValueStockOptionsExercised


Stock
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value4.137227.1127.17.38.66.0134.24.5127.33.91.73.04.41.42.22.61.20.70.70.50.50.20.30.70.1
Percentage of StockIssuedDuringPeriodValueStockOptionsExercised100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StockIssuedDuringPeriodValueStockOptionsExercised us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital


Stock
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value4.137227.1127.17.38.66.0134.24.5127.33.91.73.04.41.42.22.61.20.70.70.50.50.20.30.70.1
Percentage of StockIssuedDuringPeriodValueStockOptionsExercised100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StockRepurchasedAndRetiredDuringPeriodShares us-gaap:StatementEquityComponents

us-gaap:StockRepurchasedAndRetiredDuringPeriodShares

us-gaap:CommonStock


Stock
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312015-12-312015-09-30
Value2200000.02400000.01500000.0001100000.01300000.01400000.01500000.01900000.03300000.0600000.0900000.01500000.01100000.02700000.0
Percentage of StockRepurchasedAndRetiredDuringPeriodShares100.0100.0100.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StockRepurchasedAndRetiredDuringPeriodValue

us-gaap:StockRepurchasedAndRetiredDuringPeriodValue


Stock
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-30
Value3763581990.00.014016316115517728956671090.01741841751213210511848101
Percentage of StockRepurchasedAndRetiredDuringPeriodValue100.0100.0100.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StockRepurchasedAndRetiredDuringPeriodValue us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings


Stock
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-30
Value3763581990.00.014016316115517728956671090.01741831751213210511848101
Percentage of StockRepurchasedAndRetiredDuringPeriodValue100.0100.0100.00.00.0100.0100.099.9100.0100.0100.0100.0100.0100.00.0100.099.9100.0100.0100.099.9100.0100.0100.0

us-gaap:WeightedAverageNumberDilutedSharesOutstandingAdjustment

us-gaap:WeightedAverageNumberDilutedSharesOutstandingAdjustment


Weighted
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-30
Value1900000.02000000.02100000.01900000.02200000.02700000.02600000.02200000.02800000.02300000.02600000.02400000.03000000.03400000.02800000.01800000.01600000.01400000.01500000.01400000.02100000.02500000.02700000.001400000.0900000.0800000.0700000.0
Percentage of WeightedAverageNumberDilutedSharesOutstandingAdjustment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0

cdw:AccountsPayableInventoryFinancing

cdw:AccountsPayableInventoryFinancing


Accounts
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312010-12-31
Value37534452466147934542941146550042940738752349854149644558047750937243935437328933229931125025622528225224923425320427828
Percentage of AccountsPayableInventoryFinancing100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cdw:AccountsPayableInventoryFinancing cdw:InventoryFinancingAgreements

cdw:AccountsPayableInventoryFinancing


Accounts
Period End2020-12-312019-12-312018-12-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312011-12-31
Value524429429498541496445580477509372439354373289332299311250256225282252249278
Percentage of AccountsPayableInventoryFinancing100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cdw:AmountOwedUnderRevolvingLoanFinancingAgreement cdw:InventoryFinancingAgreements, us-gaap:LongtermDebtType

cdw:AmountOwedUnderRevolvingLoanFinancingAgreement

cdw:AccountsPayableInventoryFinancing, cdw:SeniorSecuredAssetBasedRevolvingCreditFacility


Amount
Period End2021-06-302021-03-312020-09-30
Value315283594
Percentage of AmountOwedUnderRevolvingLoanFinancingAgreement100.0100.0100.0

cdw:AccountsPayableInventoryFinancing, us-gaap:RevolvingCreditFacility


Amount
Period End2020-12-312015-12-31
Value459415
Percentage of AmountOwedUnderRevolvingLoanFinancingAgreement0.00.0

cdw:DeferredTaxAssetsRent

cdw:DeferredTaxAssetsRent


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-31
Value477.37.57.411105.56.41.2
Percentage of DeferredTaxAssetsRent100.0100.0100.0100.0100.0100.0100.0100.0100.0

cdw:DeferredTaxLiabilitiesForeignInvestments

cdw:DeferredTaxLiabilitiesForeignInvestments


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-31
Value1919191931300.0
Percentage of DeferredTaxLiabilitiesForeignInvestments100.0100.0100.0100.0100.0100.00.0

cdw:DeferredTaxLiabilitiesOperatingLeaseRightOfUseAssets

cdw:DeferredTaxLiabilitiesOperatingLeaseRightOfUseAssets


Deferred
Period End2020-12-312019-12-31
Value3233
Percentage of DeferredTaxLiabilitiesOperatingLeaseRightOfUseAssets100.0100.0

cdw:FairValueApproachWeightedAveragePercentage us-gaap:ValuationTechnique

cdw:FairValueApproachWeightedAveragePercentage

us-gaap:IncomeApproachValuationTechnique


Fair
Period End2020-12-31
Value75.0
Percentage of FairValueApproachWeightedAveragePercentage100.0

us-gaap:MarketApproachValuationTechnique


Fair
Period End2020-12-31
Value25.0
Percentage of FairValueApproachWeightedAveragePercentage33.3

cdw:LineOfCreditFacilityBorrowingBase us-gaap:LongtermDebtType

cdw:LineOfCreditFacilityBorrowingBase

cdw:SeniorSecuredAssetBasedRevolvingCreditFacility


Line
Period End2021-06-302021-03-312020-09-30
Value230022002400
Percentage of LineOfCreditFacilityBorrowingBase100.0100.0100.0

us-gaap:RevolvingCreditFacility


Line
Period End2020-12-312017-03-31
Value22001409
Percentage of LineOfCreditFacilityBorrowingBase0.00.0

cdw:LongtermDebtCurrentMaturitiesGross

cdw:LongtermDebtCurrentMaturitiesGross


Longterm
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302014-12-31
Value19197072373334252525-25.33238252541181818-18.5-26.1-26.9-27.2-27.5-15.4
Percentage of LongtermDebtCurrentMaturitiesGross100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cdw:LongtermDebtExcludingCurrentMaturitiesNetofDeferredFinancingCostsDiscountorPremium

cdw:LongtermDebtExcludingCurrentMaturitiesNetofDeferredFinancingCostsDiscountorPremium


Longterm
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302014-12-31
Value3909391138563858386134383283325932533257318331873201320932103388327732623215322232143225323232403150
Percentage of LongtermDebtExcludingCurrentMaturitiesNetofDeferredFinancingCostsDiscountorPremium100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cdw:OtherInventoryFinancingAgreements cdw:InventoryFinancingAgreements

cdw:OtherInventoryFinancingAgreements

cdw:AccountsPayableInventoryFinancing


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312011-12-31
Value4748545234415029142523127.64217372117229.51118121.50.90.62.00.91.60.10.51.52.00.10.938
Percentage of OtherInventoryFinancingAgreements100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cdw:RevolvingLoanFinancingAgreement cdw:InventoryFinancingAgreements

cdw:RevolvingLoanFinancingAgreement

cdw:AccountsPayableInventoryFinancing


Revolving
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312011-12-31
Value327296470608444303379382451475406394380481480503474427558468498354427353372289330298310250256223280252248240
Percentage of RevolvingLoanFinancingAgreement100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cdw:UnrecognizedTaxBenefitsthatWouldImpactEffectiveTaxRateNetofTaxRate us-gaap:IncomeTaxAuthority

cdw:UnrecognizedTaxBenefitsthatWouldImpactEffectiveTaxRateNetofTaxRate

us-gaap:StateAndLocalJurisdiction


Unrecognized
Period End2020-12-31
Value15
Percentage of UnrecognizedTaxBenefitsthatWouldImpactEffectiveTaxRateNetofTaxRate100.0

dei:EntityCommonStockSharesOutstanding

dei:EntityCommonStockSharesOutstanding


Entity
Period End2021-02-23
Value140
Percentage of EntityCommonStockSharesOutstanding100.0

us-gaap:AccountsPayableTradeCurrent

us-gaap:AccountsPayableTradeCurrent


Accounts
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value220720502088192218091967183519002055174515771609169312881317122413911064107299710789588661012853695704777809683662672771642518691688520517563760565
Percentage of AccountsPayableTradeCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AccruedAdvertisingCurrent

us-gaap:AccruedAdvertisingCurrent


Accrued
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value1641661531571451581471581401251191329690891228974556859505254373534413335333423273330333138333127
Percentage of AccruedAdvertisingCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AllowanceForDoubtfulAccountsReceivable

us-gaap:AllowanceForDoubtfulAccountsReceivable


Allowance
Period End2020-12-312019-12-31
Value297.9
Percentage of AllowanceForDoubtfulAccountsReceivable100.0100.0

us-gaap:AllowanceForDoubtfulAccountsReceivableCurrent

us-gaap:AllowanceForDoubtfulAccountsReceivableCurrent


Allowance
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value2127293230357.99.18.97.67.08.07.16.26.26.26.28.25.95.95.95.96.07.06.45.75.75.75.75.45.45.45.45.45.45.45.45.85.45.95.95.0
Percentage of AllowanceForDoubtfulAccountsReceivableCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AmountOfRestrictedNetAssetsForConsolidatedAndUnconsolidatedSubsidiaries us-gaap:LongtermDebtType

us-gaap:AmountOfRestrictedNetAssetsForConsolidatedAndUnconsolidatedSubsidiaries

cdw:CDWUKTermLoan


Amount
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-31
Value159173160204154134138124128117133139987593135131
Percentage of AmountOfRestrictedNetAssetsForConsolidatedAndUnconsolidatedSubsidiaries100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cdw:SeniorSecuredTermLoanFacility


Amount
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value25002400220021002000190018001700160015001500
Percentage of AmountOfRestrictedNetAssetsForConsolidatedAndUnconsolidatedSubsidiaries0.00.01383.61213.91250.0931.41168.81268.71159.41209.71171.9

us-gaap:BuildingsAndImprovementsGross

us-gaap:BuildingsAndImprovementsGross


Buildings
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value126134129123120126105104104102
Percentage of BuildingsAndImprovementsGross100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill us-gaap:BusinessAcquisition

us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill

cdw:AmplifiedITLLC


Business
Period End2021-03-15
Value88
Percentage of BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill100.0

us-gaap:CapitalizedComputerSoftwareGross

us-gaap:CapitalizedComputerSoftwareGross


Capitalized
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-31
Value2225229.610101030
Percentage of CapitalizedComputerSoftwareGross100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ContractWithCustomerLiability

us-gaap:ContractWithCustomerLiability


Contract
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value326327244247275258252212201192178188170194159
Percentage of ContractWithCustomerLiability100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DebtInstrumentCarryingAmount

us-gaap:DebtInstrumentCarryingAmount


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302014-12-312013-12-312012-12-31
Value395339563954395939253491333733033294330032263238325932553255345133183303326732563238325032593268319232513766
Percentage of DebtInstrumentCarryingAmount100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DebtInstrumentCarryingAmount us-gaap:LongtermDebtType

cdw:CDWUKTermLoan


Debt
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-08-012016-06-302016-03-31
Value565357576156646665665656757572706972567483
Percentage of DebtInstrumentCarryingAmount1.41.31.51.61.81.72.02.02.02.11.71.72.32.22.22.12.12.20.02.32.6

cdw:OtherLongTermObligations


Debt
Period End2021-06-302019-12-31
Value6.312
Percentage of DebtInstrumentCarryingAmount0.20.4

cdw:OtherlongtermobligationsDomain


Debt
Period End2021-03-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-30
Value5.64.41212124.48.58.58.38.31212121215151515
Percentage of DebtInstrumentCarryingAmount0.10.10.30.40.40.10.30.30.30.30.40.40.40.40.50.50.50.5

cdw:SeniorNotesDueMay2025


Debt
Period End2020-12-31
Value600
Percentage of DebtInstrumentCarryingAmount15.2

cdw:SeniorNotesdue2028


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-09-262018-12-31
Value6006006006006006006006006000.0
Percentage of DebtInstrumentCarryingAmount15.215.215.215.215.317.218.018.20.00.0

cdw:SeniorNotesdueMay2025


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value6006006006006000.0
Percentage of DebtInstrumentCarryingAmount15.215.215.215.215.30.0

cdw:SeniorSecuredAssetBasedRevolvingCreditFacility


Debt
Period End2021-06-302021-03-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value565650212512676760.0
Percentage of DebtInstrumentCarryingAmount1.41.41.36.11.50.82.32.30.0

cdw:SeniorSecuredTermLoanFacility


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-31
Value141514191423142714301434143814421445144914531468
Percentage of DebtInstrumentCarryingAmount35.835.936.036.036.441.143.143.643.943.945.045.1

cdw:TermLoan


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-08-172016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302011-12-31
Value141514191479148014871491149914981510151515181456150015001468147114751479148314861490149014941498150215051509151315171521152515281532134612991339133913391540
Percentage of DebtInstrumentCarryingAmount35.835.937.437.437.942.744.945.445.845.947.145.046.046.145.142.644.544.845.445.70.046.046.046.046.00.00.047.40.00.00.047.00.00.00.035.60.00.00.0

cdw:UnsecuredSeniorNotes


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-31
Value247524752475247523751775177517751700170017001700
Percentage of DebtInstrumentCarryingAmount62.662.662.662.560.550.853.253.751.651.552.752.2

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

us-gaap:DebtInstrumentFaceAmount

cdw:SeniorNotesDue2029, us-gaap:UnsecuredDebt


Debt
Period End2020-08-13
Value700
Percentage of DebtInstrumentFaceAmount100.0

us-gaap:DebtInstrumentFairValue us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:DebtInstrumentFairValue

us-gaap:FairValueInputsLevel2


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312012-06-30
Value4056402940774026396534293447341233753358314532753263329033663583341733603334337633093338333033163206328232081315
Percentage of DebtInstrumentFairValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DebtLongtermAndShorttermCombinedAmount

us-gaap:DebtLongtermAndShorttermCombinedAmount


Debt
Period End2020-12-312016-12-312015-12-312015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302011-12-31
Value39543267328631693206319031613126317232513410372436803771387138714066
Percentage of DebtLongtermAndShorttermCombinedAmount100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredFinanceCostsNet

us-gaap:DeferredFinanceCostsNet


Deferred
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302014-12-31
Value24262728261920191617171819192021212233332425-26.82826
Percentage of DeferredFinanceCostsNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredIncomeTaxLiabilities

us-gaap:DeferredIncomeTaxLiabilities


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value191161199264472576579668736797
Percentage of DeferredIncomeTaxLiabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxAssetsGross

us-gaap:DeferredTaxAssetsGross


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value1671197483104101103102125130
Percentage of DeferredTaxAssetsGross100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxAssetsOperatingLossCarryforwards

us-gaap:DeferredTaxAssetsOperatingLossCarryforwards


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value22202328121418201814
Percentage of DeferredTaxAssetsOperatingLossCarryforwards100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxAssetsOther

us-gaap:DeferredTaxAssetsOther


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value151410.08.06.25.95.07.18.410
Percentage of DeferredTaxAssetsOther100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits

us-gaap:DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value219.69.38.0222127161612
Percentage of DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost

us-gaap:DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value2021171829176.51.6107.5
Percentage of DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts

us-gaap:DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value267.06.55.48.36.46.35.44.24.4
Percentage of DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsPolicyholderLiabilities

us-gaap:DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsPolicyholderLiabilities


Deferred
Period End2020-12-312019-12-312018-12-31
Value13400.0
Percentage of DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsPolicyholderLiabilities100.0100.00.0

us-gaap:DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets

us-gaap:DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value76112148194337411425486551607
Percentage of DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxLiabilitiesOther

us-gaap:DeferredTaxLiabilitiesOther


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value233.31112151715119.18.2
Percentage of DeferredTaxLiabilitiesOther100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxLiabilitiesPropertyPlantAndEquipment

us-gaap:DeferredTaxLiabilitiesPropertyPlantAndEquipment


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value39272020303022252935
Percentage of DeferredTaxLiabilitiesPropertyPlantAndEquipment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DerivativeAssets

us-gaap:DerivativeAssets


Derivative
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value1.01.01.01.00.91.12.58.312225.4
Percentage of DerivativeAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DerivativeNotionalAmount us-gaap:DerivativeInstrumentRisk

us-gaap:DerivativeNotionalAmount

cdw:InterestRateCapAgreementEffectiveDecember312020


Derivative
Period End2020-12-31
Value1400
Percentage of DerivativeNotionalAmount100.0

cdw:InterestRateCapAgreementEffectiveDecember312022


Derivative
Period End2020-12-31
Value1400
Percentage of DerivativeNotionalAmount100.0

us-gaap:InterestRateCap


Derivative
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value140028002800280012001200
Percentage of DerivativeNotionalAmount100.00.00.00.00.00.0

us-gaap:EmployeeRelatedLiabilitiesCurrent

us-gaap:EmployeeRelatedLiabilitiesCurrent


Employee
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value255240288216163201212191161178186162138140129138150171167164135126120117108102130103979111293938699848776106877791
Percentage of EmployeeRelatedLiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized

us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized


Employee
Period End2020-12-31
Value43
Percentage of EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized100.0

us-gaap:FiniteLivedIntangibleAssetsAccumulatedAmortization

us-gaap:FiniteLivedIntangibleAssetsAccumulatedAmortization


Finite
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value23992208199017971599141612251085904726
Percentage of FiniteLivedIntangibleAssetsAccumulatedAmortization100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FiniteLivedIntangibleAssetsAccumulatedAmortization us-gaap:FiniteLivedIntangibleAssetsByMajorClass

cdw:CustomerRelationshipsandContracts


Finite
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-31
Value192717861625149013221162
Percentage of FiniteLivedIntangibleAssetsAccumulatedAmortization80.380.981.782.982.782.0

us-gaap:OtherIntangibleAssets


Finite
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value5.43.52.20.84.12.92.21.91.61.5
Percentage of FiniteLivedIntangibleAssetsAccumulatedAmortization0.20.20.10.00.30.20.20.20.20.2

us-gaap:SoftwareAndSoftwareDevelopmentCosts


Finite
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value18616012589777758796043
Percentage of FiniteLivedIntangibleAssetsAccumulatedAmortization7.87.26.35.04.95.54.87.46.66.0

us-gaap:TradeNames


Finite
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value28025923721619517315213010988
Percentage of FiniteLivedIntangibleAssetsAccumulatedAmortization11.711.711.912.012.212.312.412.112.112.2

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive


Finite
Period End2020-12-31
Value98
Percentage of FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive100.0

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths


Finite
Period End2020-12-31
Value126
Percentage of FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths100.0

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearFive

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearFive


Finite
Period End2020-12-31
Value42
Percentage of FiniteLivedIntangibleAssetsAmortizationExpenseYearFive100.0

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearFour

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearFour


Finite
Period End2020-12-31
Value43
Percentage of FiniteLivedIntangibleAssetsAmortizationExpenseYearFour100.0

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearThree

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearThree


Finite
Period End2020-12-31
Value57
Percentage of FiniteLivedIntangibleAssetsAmortizationExpenseYearThree100.0

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo


Finite
Period End2020-12-31
Value77
Percentage of FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo100.0

us-gaap:FiniteLivedIntangibleAssetsGross

us-gaap:FiniteLivedIntangibleAssetsGross


Finite
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value2844280327022694265526922394241323832362
Percentage of FiniteLivedIntangibleAssetsGross100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FiniteLivedIntangibleAssetsGross us-gaap:FiniteLivedIntangibleAssetsByMajorClass

cdw:CustomerRelationshipsandContracts


Finite
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-31
Value213121112071210620842128
Percentage of FiniteLivedIntangibleAssetsGross74.975.376.678.278.579.0

us-gaap:OtherIntangibleAssets


Finite
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value9.65.53.72.96.05.83.23.13.33.3
Percentage of FiniteLivedIntangibleAssetsGross0.30.20.10.10.20.20.10.10.10.1

us-gaap:SoftwareAndSoftwareDevelopmentCosts


Finite
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value2802632051621421361101289777
Percentage of FiniteLivedIntangibleAssetsGross9.99.47.66.05.45.14.65.34.13.3

us-gaap:TradeNames


Finite
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value422422422422422422421421421421
Percentage of FiniteLivedIntangibleAssetsGross14.915.115.615.715.915.717.617.417.717.8

us-gaap:GoodwillImpairedAccumulatedImpairmentLoss us-gaap:StatementBusinessSegments

us-gaap:GoodwillImpairedAccumulatedImpairmentLoss

cdw:Public


Goodwill
Period End2021-06-302021-03-312020-12-312019-12-312018-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value354354354354354354354354354354354354
Percentage of GoodwillImpairedAccumulatedImpairmentLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AllOtherSegments


Goodwill
Period End2021-06-302021-03-312020-12-312019-12-312018-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value282828282828282828282828
Percentage of GoodwillImpairedAccumulatedImpairmentLoss7.97.97.97.97.98.08.08.08.08.08.08.0

us-gaap:Corporate


Goodwill
Period End2021-06-302021-03-312020-12-312019-12-312018-12-312016-12-31
Value15711571157115711571-1571.4
Percentage of GoodwillImpairedAccumulatedImpairmentLoss443.8443.8443.8443.8443.8-443.8

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths


Lessee
Period End2020-12-31
Value32
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths100.0

us-gaap:LettersOfCreditOutstandingAmount us-gaap:LongtermDebtType

us-gaap:LettersOfCreditOutstandingAmount

us-gaap:RevolvingCreditFacility


Letters
Period End2020-12-31
Value1000000.0
Percentage of LettersOfCreditOutstandingAmount100.0

us-gaap:LineOfCreditFacilityMaximumBorrowingCapacity us-gaap:DebtInstrument, us-gaap:LongtermDebtType

us-gaap:LineOfCreditFacilityMaximumBorrowingCapacity

cdw:CDWUKRevolvingCreditFacility, us-gaap:RevolvingCreditFacility


Line
Period End2020-12-31
Value50
Percentage of LineOfCreditFacilityMaximumBorrowingCapacity100.0

us-gaap:LineOfCreditFacilityMaximumBorrowingCapacity us-gaap:LongtermDebtType

cdw:CDWUKRevolvingCreditFacility


Line
Period End2021-03-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value15065505050505050505066
Percentage of LineOfCreditFacilityMaximumBorrowingCapacity0.00.00.00.00.00.00.00.00.00.00.0

cdw:RevolvingLoan


Line
Period End2021-03-312021-03-262021-03-252020-12-31
Value1600160014501450
Percentage of LineOfCreditFacilityMaximumBorrowingCapacity0.00.00.02900.0

us-gaap:LineOfCreditFacilityRemainingBorrowingCapacity us-gaap:LongtermDebtType

us-gaap:LineOfCreditFacilityRemainingBorrowingCapacity

cdw:SeniorSecuredAssetBasedRevolvingCreditFacility


Line
Period End2021-06-302021-03-312020-09-30
Value12001300856
Percentage of LineOfCreditFacilityRemainingBorrowingCapacity100.0100.0100.0

us-gaap:RevolvingCreditFacility


Line
Period End2020-12-312018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-30
Value10009879967941016963716802778907843905
Percentage of LineOfCreditFacilityRemainingBorrowingCapacity0.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive


Long
Period End2020-12-31
Value2648
Percentage of LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive100.0

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths


Long
Period End2020-12-31
Value70
Percentage of LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths100.0

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive


Long
Period End2020-12-31
Value614
Percentage of LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive100.0

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour


Long
Period End2020-12-31
Value589
Percentage of LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour100.0

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree


Long
Period End2020-12-31
Value14
Percentage of LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree100.0

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo


Long
Period End2020-12-31
Value15
Percentage of LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo100.0

us-gaap:LongtermDebtWeightedAverageInterestRate us-gaap:LongtermDebtType

us-gaap:LongtermDebtWeightedAverageInterestRate

cdw:CDWUKTermLoan


Longterm
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302016-12-31
Value1.4451.4640.016220.02070.02190.02160.0220.0230.0230.0230.01940.01980.0190.01690.01690.0177
Percentage of LongtermDebtWeightedAverageInterestRate100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cdw:SeniorNotesDueMay2025


Longterm
Period End2020-12-31
Value4.125
Percentage of LongtermDebtWeightedAverageInterestRate285.5

cdw:SeniorNotesdue2024


Longterm
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-31
Value5.55.55.55.50.0550.0550.0550.0550.0550.0550.0550.0550.0550.0550.0550.0550.0550.0550.0550.0550.0550.0550.0550.0550.0550.0550.055
Percentage of LongtermDebtWeightedAverageInterestRate0.00.0380.6375.7339.1265.7251.1254.6250.0239.1239.1239.1283.5277.8289.5325.4325.40.0310.70.00.00.00.00.00.00.00.0

cdw:SeniorNotesdue2028


Longterm
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-09-262018-12-31
Value4.254.254.254.250.04250.04250.04250.04250.04250
Percentage of LongtermDebtWeightedAverageInterestRate0.00.0294.1290.3262.0205.3194.1196.80.00.0

cdw:SeniorNotesdueMay2025


Longterm
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value4.1254.1254.1254.1250.041250
Percentage of LongtermDebtWeightedAverageInterestRate0.00.0285.5281.8254.30.0

cdw:SeniorSecuredAssetBasedRevolvingCreditFacility


Longterm
Period End2021-06-302021-03-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value1.3751.3750.014380.02620.050.03310.0370.0380
Percentage of LongtermDebtWeightedAverageInterestRate0.00.088.7126.6228.3153.2168.2165.20.0

cdw:SeniorSecuredTermLoanFacility


Longterm
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-31
Value1.861.861.91.90.01930.02740.03550.0380.0420.0430.0410.037
Percentage of LongtermDebtWeightedAverageInterestRate0.00.0131.5129.8119.0132.4162.1175.9190.9187.0178.3194.7

us-gaap:OperatingLeaseWeightedAverageDiscountRatePercent

us-gaap:OperatingLeaseWeightedAverageDiscountRatePercent


Operating
Period End2020-12-312019-12-31
Value3.984.78
Percentage of OperatingLeaseWeightedAverageDiscountRatePercent100.0100.0

us-gaap:OperatingLossCarryforwards us-gaap:IncomeTaxAuthority

us-gaap:OperatingLossCarryforwards

us-gaap:StateAndLocalJurisdiction


Operating
Period End2020-12-31
Value6000000.0
Percentage of OperatingLossCarryforwards100.0

us-gaap:OtherReceivablesNetCurrent

us-gaap:OtherReceivablesNetCurrent


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value430396379404353442395432406353316370373310336380337239234269260212198230188174155175159164146197165151148171160156143186187192
Percentage of OtherReceivablesNetCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PropertyPlantAndEquipmentOther

us-gaap:PropertyPlantAndEquipmentOther


Property
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value1261321051161019965615649
Percentage of PropertyPlantAndEquipmentOther100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PropertyPlantAndEquipmentOwnedAccumulatedDepreciation

us-gaap:PropertyPlantAndEquipmentOwnedAccumulatedDepreciation


Property
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value243257215201184199172179160140
Percentage of PropertyPlantAndEquipmentOwnedAccumulatedDepreciation100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RevenueRemainingPerformanceObligation

us-gaap:RevenueRemainingPerformanceObligation


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value3639383237424340403937383339
Percentage of RevenueRemainingPerformanceObligation100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:SalesAndExciseTaxPayableCurrent

us-gaap:SalesAndExciseTaxPayableCurrent


Sales
Period End2020-12-312019-12-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value104885534384243303245383026383830272729242229292320222219182323191923
Percentage of SalesAndExciseTaxPayableCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue us-gaap:AwardType

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue

us-gaap:PerformanceShares


Share
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-31
Value102.0787.7865.8550.7538.9228.6724.4
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue100.0100.0100.0100.0100.0100.0100.0

us-gaap:RestrictedStockUnitsRSU


Share
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312014-09-302014-06-302014-03-312013-12-312012-12-31
Value107.8875.5659.5640.1119.5219.1917.1917.1817.1817.1817.040
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue105.786.190.479.050.266.970.50.00.00.00.00.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice


Share
Period End2020-12-31
Value56.63
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue


Share
Period End2020-12-31
Value230
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue


Share
Period End2020-12-31
Value64
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice


Share
Period End2020-12-31
Value94.7
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice100.0

us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1

us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1


Sharebased
Period End2020-12-31
Value164
Percentage of SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1100.0

us-gaap:StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1

us-gaap:StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1


Stock
Period End2020-12-31
Value338
Percentage of StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1100.0

us-gaap:TaxCreditCarryforwardAmount us-gaap:IncomeTaxAuthority

us-gaap:TaxCreditCarryforwardAmount

us-gaap:StateAndLocalJurisdiction


Tax
Period End2020-12-312017-12-31
Value2328
Percentage of TaxCreditCarryforwardAmount100.0100.0

us-gaap:ValuationAllowancesAndReservesBalance us-gaap:ValuationAllowancesAndReservesType

us-gaap:ValuationAllowancesAndReservesBalance

us-gaap:AllowanceForCreditLoss


Valuation
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-31
Value297.97.06.25.96.0
Percentage of ValuationAllowancesAndReservesBalance100.0100.0100.0100.0100.0100.0

Line plots across dimensions of each concept


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:OperatingIncomeLoss
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
('us-gaap:OperatingSegments', None)
Operating Income Lossus-gaap: Consolidation Items, us-gaap: Statement Business Segments
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:RevenueFromContractWithCustomerExcludingAssessedTax
us-gaap:ContractWithCustomerSalesChannel
(None,)
Revenue From Contract With Customer Excluding Assessed Taxus-gaap: Contract With Customer Sales Channel
us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax
us-gaap:ProductOrService
(None,)
Revenue From Contract With Customer Excluding Assessed Taxus-gaap: Product Or Service
us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax
us-gaap:StatementGeographical
(None,)
Revenue From Contract With Customer Excluding Assessed Taxus-gaap: Statement Geographical
us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax
us-gaap:TimingOfTransferOfGoodOrService
(None,)
Revenue From Contract With Customer Excluding Assessed Taxus-gaap: Timing Of Transfer Of Good Or Service
us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax
us-gaap:StatementBusinessSegments
(None,)
Revenue From Contract With Customer Excluding Assessed Taxus-gaap: Statement Business Segments
us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax
cdw:Public, us-gaap:StatementBusinessSegments
(None, 'cdw:Public')
Revenue From Contract With Customer Excluding Assessed Taxcdw: Public, us-gaap: Statement Business Segments
us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax
us-gaap:StatementGeographical, us-gaap:StatementBusinessSegments
('country:US', None)
Revenue From Contract With Customer Excluding Assessed Taxus-gaap: Statement Geographical, us-gaap: Statement Business Segments
us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax
us-gaap:ContractWithCustomerSalesChannel, us-gaap:StatementBusinessSegments
(None, 'cdw:PublicSegmentGovernmentAgenciesEducationandHealthcare')
Revenue From Contract With Customer Excluding Assessed Taxus-gaap: Contract With Customer Sales Channel, us-gaap: Statement Business Segments
us-gaap:StockholdersEquity
us-gaap:StatementEquityComponents
(None,)
Stockholders Equityus-gaap: Statement Equity Components
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:StockholdersEquity
us-gaap:StatementEquityComponents
(None,)
Stockholders Equityus-gaap: Statement Equity Components
us-gaap:DepreciationDepletionAndAmortization
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
('us-gaap:OperatingSegments', None)
Depreciation Depletion And Amortizationus-gaap: Consolidation Items, us-gaap: Statement Business Segments