IT


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

Table of contents



us-gaap:CommonStockValue

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic

us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount

us-gaap:EarningsPerShareBasic

us-gaap:EarningsPerShareDiluted

us-gaap:AllocatedShareBasedCompensationExpense
us-gaap:AwardType
us-gaap:IncomeStatementLocation
us-gaap:TitleOfIndividual, us-gaap:AwardType

us-gaap:ComprehensiveIncomeNetOfTax

us-gaap:CostOfGoodsAndServicesSold
us-gaap:ConsolidationItems

us-gaap:CostsAndExpenses

us-gaap:GainsLossesOnExtinguishmentOfDebt

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments

us-gaap:IncomeTaxExpenseBenefit

us-gaap:InterestExpense

us-gaap:NetIncomeLoss
us-gaap:StatementEquityComponents

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

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax

us-gaap:OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax

us-gaap:OtherComprehensiveIncomeLossNetOfTax
us-gaap:StatementEquityComponents

us-gaap:OtherNonoperatingIncomeExpense

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

us-gaap:SellingGeneralAndAdministrativeExpense
us-gaap:ConsolidationItems

us-gaap:Assets

us-gaap:Liabilities

us-gaap:LiabilitiesAndStockholdersEquity

us-gaap:StockholdersEquity
us-gaap:StatementEquityComponents

us-gaap:AssetsCurrent

us-gaap:CashAndCashEquivalentsAtCarryingValue

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents

us-gaap:AccountsReceivableNetCurrent

us-gaap:PrepaidExpenseAndOtherAssetsCurrent

us-gaap:NoncurrentAssets
us-gaap:StatementGeographical

us-gaap:PropertyPlantAndEquipmentGross
us-gaap:PropertyPlantAndEquipmentByType

us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment

us-gaap:AmortizationOfIntangibleAssets

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:AccountsPayableAndAccruedLiabilitiesCurrent

us-gaap:AccountsPayableCurrent

us-gaap:ContractWithCustomerLiabilityCurrent

us-gaap:LiabilitiesCurrent

us-gaap:LongTermDebtCurrent

us-gaap:OperatingLeaseLiabilityCurrent

us-gaap:OtherAccruedLiabilitiesCurrent

us-gaap:TaxesPayableCurrent
us-gaap:DebtInstrument, us-gaap:LongtermDebtType
us-gaap:LongTermDebt
us-gaap:LongtermDebtType

us-gaap:LongTermDebtNoncurrent

us-gaap:DeferredIncomeTaxLiabilitiesNet
us-gaap:BalanceSheetLocation

us-gaap:PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent

us-gaap:OtherLiabilitiesNoncurrent

us-gaap:OperatingLeaseLiabilityNoncurrent

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive

us-gaap:OperatingLeaseLiability

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue

us-gaap:LesseeOperatingLeaseLiabilityUndiscountedExcessAmount

us-gaap:StockholdersEquity
us-gaap:StatementEquityComponents

us-gaap:CommonStockValue

us-gaap:AdditionalPaidInCapital

us-gaap:RetainedEarningsAccumulatedDeficit

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax

us-gaap:TreasuryStockValue

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
us-gaap:StatementEquityComponents

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:AmortizationOfFinancingCosts

us-gaap:DeferredIncomeTaxExpenseBenefit
us-gaap:ConsolidationItems
us-gaap:DepreciationDepletionAndAmortization

us-gaap:IncreaseDecreaseInAccountsReceivable

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetIncomeLoss
us-gaap:StatementEquityComponents

us-gaap:ShareBasedCompensation

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:ProceedsFromIssuanceOfLongTermDebt
us-gaap:DebtInstrument, us-gaap:LongtermDebtType

us-gaap:RepaymentsOfLongTermDebt
us-gaap:DebtInstrument, us-gaap:LongtermDebtType

us-gaap:PaymentsForRepurchaseOfCommonStock
us-gaap:ShareRepurchaseProgram
us-gaap:ShareRepurchaseProgram, us-gaap:SubsequentEventType

us-gaap:EffectiveIncomeTaxRateContinuingOperations

us-gaap:DeferredTaxLiabilities

us-gaap:UnrecognizedTaxBenefits

us-gaap:DeferredTaxAssetsValuationAllowance

it:BusinessCombinationAcquisitionandIntegrationRelatedCosts
us-gaap:ConsolidationItems
us-gaap:BusinessAcquisition
it:BusinessCombinationFutureCompensationExpense

it:EffectiveIncomeTaxRateReconciliationIntercompanySaleOfIntellectualPropertyAmount

it:FiniteLivedIntangibleAssetsFullyAmortizedIntangibles
us-gaap:FiniteLivedIntangibleAssetsByMajorClass

it:InterestExpenseandOtherNonoperatingIncome

it:OperatingLeaseCostSubleasingActivities

it:OperatingLeaseRightOfUseAssetReductionInCarryingAmount

it:TreasuryStockAveragePricePaidPerShare
us-gaap:BusinessAcquisition
us-gaap:BusinessCombinationConsiderationTransferred1

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect
us-gaap:DerivativeInstrumentRisk
us-gaap:CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths

us-gaap:ContractWithCustomerLiabilityRevenueRecognized

us-gaap:DebtInstrumentInterestRateDuringPeriod

us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost

us-gaap:Depreciation

us-gaap:DepreciationAndAmortization

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

us-gaap:DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet

us-gaap:EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents

us-gaap:FiniteLivedIntangibleAssetsForeignCurrencyTranslationGainLoss
us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:GoodwillForeignCurrencyTranslationGainLoss
us-gaap:StatementBusinessSegments

us-gaap:IncreaseDecreaseInAccountsPayableAndAccruedLiabilities

us-gaap:IncreaseDecreaseInDeferredCharges

us-gaap:IncreaseDecreaseInDeferredRevenue

us-gaap:IncreaseDecreaseInOtherOperatingAssets

us-gaap:IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets

us-gaap:IncrementalCommonSharesAttributableToShareBasedPaymentArrangements

us-gaap:InsuredEventGainLoss

us-gaap:LeaseCost

us-gaap:OperatingLeaseCost

us-gaap:OperatingLeasePayments

us-gaap:OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax
us-gaap:StatementEquityComponents

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax
us-gaap:BalanceSheetLocation, us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation
us-gaap:DerivativeInstrumentRisk, us-gaap:IncomeStatementLocation
us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax

us-gaap:OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax

us-gaap:PaymentsForCapitalImprovements

us-gaap:PaymentsOfDebtExtinguishmentCosts
us-gaap:DebtInstrument, us-gaap:LongtermDebtType

us-gaap:PaymentsOfFinancingCosts
us-gaap:BusinessAcquisition
us-gaap:PaymentsToAcquireBusinessesNetOfCashAcquired

us-gaap:ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions

us-gaap:ProceedsFromLeasePayments

us-gaap:ProceedsFromLinesOfCredit

us-gaap:ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax
us-gaap:StatementEquityComponents

us-gaap:RepaymentsOfLinesOfCredit

us-gaap:RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability

us-gaap:StockGrantedDuringPeriodValueSharebasedCompensation
us-gaap:StatementEquityComponents

us-gaap:StockRepurchasedDuringPeriodValue
us-gaap:StatementEquityComponents

us-gaap:SubleaseIncome

us-gaap:UnusualOrInfrequentItemInsuranceProceeds

us-gaap:VariableLeaseCost
us-gaap:DebtInstrument, us-gaap:LongtermDebtType
us-gaap:WriteOffOfDeferredDebtIssuanceCost

it:AllowanceForDoubtfulAccountsReceivableRevenueReserve

it:AveragemarketpricepershareofCommonStockduringtheyear
us-gaap:BusinessAcquisition
it:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedFiniteLivedIntangibleAssetsAndGoodwill

it:DebtLongtermandShorttermCombinedAmountGross

it:DeferredTaxAssetsAccruedExpenses

it:DeferredTaxAssetsLeasingArrangements

it:DeferredTaxAssetsOperatingLossAndTaxCreditCarryforwards

it:DeferredTaxLiabilitiesDepreciation

it:DefinedBenefitPlanReinsuranceAsset
us-gaap:PlanName
it:EmployeeStockPurchasePlanMaximumNumberofSharesthatMaybePurchasebyEligibleParticipants

it:FiniteLivedIntangibleAssetExpectedAmortizationAfterYearFour
us-gaap:DebtInstrument, us-gaap:LongtermDebtType
it:FloatingEurodollarBaseRate

it:LesseeOperatingLeaseLeaseNotYetCommencedPaymentsDue

it:NumberofEnterprisesServed
us-gaap:StatementGeographical
it:OperatingLeasesConcentrationPercentageOfPayments

it:OtherLiabilitiesNoncurrentOther

it:SeveranceandRetentionBonusPayable
us-gaap:AwardType
it:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingWeightedAverageExercisePrice
us-gaap:TitleOfIndividual, us-gaap:AwardType
it:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsTargetPerformancePercentage
us-gaap:AwardType
it:ShareBasedCompensationArrangementbyShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingIntrinsicValue.
us-gaap:AwardType
it:SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedandExpectedtoVestExercisableAggregateIntrinsicValue.
us-gaap:AwardType
it:SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsVestedExpectedtoVestandExercisableWeightedAverageGrantDateFairValue.
us-gaap:AwardType
it:SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsVestedandExpectedtoVestExercisableWeightedAverageExercisePrice.

it:StockRepurchaseProgramAdditionalAuthorizedAmount
us-gaap:SubsequentEventType

it:TaxesPayableNoncurrent

it:UnrecognizedTaxBenefitsthatWouldResultAdjustmentstoOtherTaxAccounts

us-gaap:AccountsReceivableGrossCurrent

us-gaap:AccruedBonusesCurrent

us-gaap:AccruedSalesCommissionCurrent

us-gaap:AllowanceForDoubtfulAccountsReceivableCurrent
us-gaap:DerivativeInstrumentRisk
us-gaap:AociLossCashFlowHedgeCumulativeGainLossAfterTax

us-gaap:AssetsFairValueDisclosure
us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FinancialInstrument
us-gaap:FairValueByMeasurementFrequency
us-gaap:BusinessAcquisition
us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther

us-gaap:CapitalizedComputerSoftwareNet

us-gaap:CashSurrenderValueOfLifeInsurance

us-gaap:ContractWithCustomerAssetGross

us-gaap:ContractWithCustomerLiability

us-gaap:ContractWithCustomerLiabilityNoncurrent

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

us-gaap:DebtIssuanceCostsLineOfCreditArrangementsNet

us-gaap:DebtLongtermAndShorttermCombinedAmount

us-gaap:DecreaseInUnrecognizedTaxBenefitsIsReasonablyPossible
us-gaap:BalanceSheetLocation
us-gaap:DeferredCompensationLiabilityClassifiedNoncurrent
us-gaap:BalanceSheetLocation
us-gaap:DeferredCompensationPlanAssets

us-gaap:DeferredIncomeTaxAssetsNet
us-gaap:BalanceSheetLocation

us-gaap:DeferredIncomeTaxLiabilities

us-gaap:DeferredRevenueCurrent

us-gaap:DeferredRevenueNoncurrent

us-gaap:DeferredTaxAssetsGross

us-gaap:DeferredTaxAssetsOther

us-gaap:DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost

us-gaap:DeferredTaxLiabilitiesGoodwillAndIntangibleAssets

us-gaap:DeferredTaxLiabilitiesOther

us-gaap:DeferredTaxLiabilitiesPrepaidExpenses

us-gaap:DefinedBenefitPensionPlanLiabilitiesNoncurrent

us-gaap:DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesAfterTax

us-gaap:DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent

us-gaap:DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate

us-gaap:DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationWeightedAverageInterestCreditingRate

us-gaap:DefinedBenefitPlanBenefitObligation

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo

us-gaap:DefinedBenefitPlanFairValueOfPlanAssets

us-gaap:DefinedBenefitPlanFundedStatusOfPlan

us-gaap:DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateAccumulatedBenefitObligation

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

us-gaap:DerivativeLiabilitiesCurrent

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

us-gaap:EmployeeRelatedLiabilitiesCurrent

us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized

us-gaap:FiniteLivedIntangibleAssetsAccumulatedAmortization
us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearFive

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearFour

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearThree

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo

us-gaap:FiniteLivedIntangibleAssetsGross
us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:InterestRateCashFlowHedgeGainLossToBeReclassifiedDuringNext12MonthsNet
us-gaap:DerivativeInstrumentRisk
us-gaap:InterestRateFairValueHedgeDerivativeAtFairValueNet
us-gaap:DerivativeInstrumentRisk, us-gaap:StatementEquityComponents

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths

us-gaap:LessorOperatingLeasePaymentsToBeReceived

us-gaap:LessorOperatingLeasePaymentsToBeReceivedFiveYears

us-gaap:LessorOperatingLeasePaymentsToBeReceivedFourYears

us-gaap:LessorOperatingLeasePaymentsToBeReceivedNextTwelveMonths

us-gaap:LessorOperatingLeasePaymentsToBeReceivedThereafter

us-gaap:LessorOperatingLeasePaymentsToBeReceivedThreeYears

us-gaap:LessorOperatingLeasePaymentsToBeReceivedTwoYears

us-gaap:LiabilitiesFairValueDisclosure
us-gaap:DebtInstrument, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FinancialInstrument, us-gaap:LongtermDebtType
us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FinancialInstrument
us-gaap:FairValueByMeasurementFrequency
us-gaap:DebtInstrument, us-gaap:LongtermDebtType
us-gaap:LineOfCreditFacilityInterestRateAtPeriodEnd

us-gaap:MoneyMarketFundsAtCarryingValue

us-gaap:OperatingLeaseWeightedAverageDiscountRatePercent
it:Period, us-gaap:IncomeTaxAuthority
us-gaap:OperatingLossCarryforwards
us-gaap:IncomeTaxAuthority

us-gaap:OtherAssetsMiscellaneousNoncurrent

us-gaap:OtherDeferredCostsNet

us-gaap:RestrictedCash

us-gaap:RevenueRemainingPerformanceObligation

us-gaap:SalesAndExciseTaxPayableCurrentAndNoncurrent
us-gaap:AwardType
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
us-gaap:AwardType, us-gaap:PlanName
us-gaap:AwardType
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant

us-gaap:StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1
us-gaap:SubsequentEventType
us-gaap:IncomeTaxAuthority
us-gaap:TaxCreditCarryforwardAmount

us-gaap:UndistributedEarningsOfForeignSubsidiaries

us-gaap:UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate

us-gaap:ValuationAllowancesAndReservesBalance

Plots across concepts


IncomeStatement
Other Comprehensive Income Loss Net Of Tax
Expenses
Other Nonoperating Income Expense
Balance Sheet
Stockholders Equity
Assets
Property Plant And Equipment Net
Current Assets
Prepaid Expense And Other Assets Current
NonCurrent Assets
Deferred Income Tax Assets Net
PropertyPlantAndEquipmentNet
Property Plant And Equipment Net
Liabilities
Operating Lease Liability
Current Liabilities
Long Term Debt Current
Noncurrent Liabilities
Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent
Stockholders Equity
Accumulated Other Comprehensive Income Loss Net Of Tax
CashFlow
Net Cash Provided By Used In Financing Activities
NetCashProvidedByUsedInOperatingActivities
Increase Decrease In Accounts Receivable
NetCashProvidedByUsedInFinancingActivities
Net Cash Provided By Used In Financing Activities
Shares
Weighted Average Number Of Shares Outstanding Basic
OperatingLeaseLiability
Operating Lease Liability Current
LesseeOperatingLeaseLiabilityPaymentsDue
Lessee Operating Lease Liability Payments Due Year Four
FiniteLivedIntangibleAssets
Finite Lived Intangible Assets Accumulated Amortization
AccountsReceivable
Allowance For Doubtful Accounts Receivable Current

Tables

  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:CommonStockValue █████████████████▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁0.0820.0820.0820.0820.0820.0820.0820.0820.0820.0820.0820.0820.0820.0820.0820.0820.0820.0780.0780.0780.0780.0780.0780.0780.0780.0780.0780.0780.0780.0780.0780.0780.0780.0780.0780.0780.0780.0780.0780.0780.0780.0780.078NANANA
us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding ▁█86.58989.139NA89.95589.7890.066NA90.88791.18891.004NA92.14892.15691.005NA90.62489.29784.095NA83.80383.47683.464NA84.11384.27187.773NA89.70890.74493.209NA94.35595.18895.537NA95.61195.42396.199NA98.25999.3499.451NA98.79798.85599.649
us-gaap:WeightedAverageNumberOfSharesOutstandingBasic ▁█85.71288.352NA89.37889.32389.219NA89.84690.11289.882NA90.85491.04891.005NA90.62489.29782.835NA82.63882.55982.451NA82.98983.20386.539NA88.51389.52191.669NA92.68993.57493.595NA93.52293.3593.416NA96.05796.88696.442NA95.47395.65795.693
us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount ▁█0.10.4NA0.51.30.7NA0.30.30.2NA1.41.31.3NA1.40.40.4NA0.20.30.4NA0.30.30.2NA0.40.40.2NA0.40.40.2NA0.40.70.6NA1.60.81.2NA1.01.6NA
us-gaap:EarningsPerShareBasic █▆▅▃▄▄▄▃▅▃▄▃▄▂▅▂▁▃▄▃▄▄▄▃▄▃▄▃▄▃▄▃▄▃▄▃▃▃▄▃▃▃▃▃▃▃3.161.861.34000000000000030.190.620.840.760.461.150.230.93000000000000020.130.51-0.221.23-0.53-1.030.440.79999999999999980.370.580.490.78999999999999980.370.610.330.67000000000000020.380.590.410.66999999999999990.410.50.390.63000000000000010.340.440.370.480.320.330.30.390.210.210.2
us-gaap:EarningsPerShareDiluted █▆▅▃▄▄▄▄▅▃▄▃▄▂▅▂▁▃▄▃▄▄▄▃▄▃▄▃▄▃▄▃▄▃▄▃▃▃▄▃▃▃▃▃▃▃3.131.841.330.190.610.830.740.461.130.230.91000000000000010.130.5-0.221.23-0.53-1.030.430.790.360.570.480.770.360.610.320.65999999999999970.380.580.40.64999999999999990.40.490.380.60999999999999990.330.430.360.469999999999999860.310.320.290.360.20.20.19
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
 Operating Margin us-gaap:ConsolidationItems us-gaap:OperatingSegments▇▆▆▃▂▃█▃▅▂▅▁1167.3191104.0381112.759994.618973.1351018.8911203.4931000.5021070.882970.4441088.879921.674NANANANANANANANANANANANANA471.186NA470.94519.82NANANANANANANANANANANANANANANANANA
 Operating Margin us-gaap:ConsolidationItems,us-gaap:StatementBusinessSegments us-gaap:OperatingSegments,it:Conferences█▁58.17924.802NA12.7380.31713.87NA66.286141.17451.932NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 Operating Margin us-gaap:ConsolidationItems,us-gaap:StatementBusinessSegments us-gaap:OperatingSegments,it:Consulting█▆▅▄▆▅▇▅▇▅▅▁105.90299.50493.99189.16197.48995.73103.89593.218103.65393.13895.56178.752NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 Operating Margin us-gaap:ConsolidationItems,us-gaap:StatementBusinessSegments us-gaap:OperatingSegments,it:ResearchSegment█▇▆▅▄▅▄▃▃▃▂▁1003.238979.732925.553892.719875.329909.291882.121840.998826.055825.374797.338774.188NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
 TTM Greenblatt ROC _ _█▇▆▄▅▅▅▄▅▄▅▄▄▃▄▂▁▄▅▄▄▄▅▄▄▄▅▄▄▄▅▄▄▄▄▄▄▄▄▄▄▄▄274.714225.412178.1387.6599.651124.718136.13969.147116.00248.799129.60652.72486.096-8.71162.894-24.349-98.38853.514108.68748.72683.29964.429101.62152.47485.2248.68295.8449.39181.76159.1788.75758.74373.98754.00579.66149.76862.72253.55669.46347.2551.56845.78153.074NANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:AllocatedShareBasedCompensationExpense ▆█▁▃▃▅▂▃▃▇▂▂▃▇▂▃▇▅▂▂▂▃▂▂▂▃▂▂▁▃▁▁▁26.236.16.315.515.725.111.113.013.131.810.210.714.430.910.914.431.022.610.69.511.115.59.19.610.716.79.48.86.913.87.6517.47.2NANANANANANANANANANANANANA
us-gaap:ComprehensiveIncomeNetOfTax █▆▆▃▄▂▄▃▄▃▄▃▃▃▅▃▁▃▄▃▄▃▄▃▄▃▃▃▄▃▄▄▄▃▄▃▃▃▄▃▃▃▃▃▃281.436170.15150.59228.92681.874-15.93771.02733.60391.493-0.90466.24613.12-10.00611.13110.031-0.507-93.33838.28464.58630.70349.33835.13970.63516.70957.8667.19339.97521.89254.44137.94363.02942.5746.10933.4756.11836.42536.6636.87545.00921.90930.29830.84136.83628.10717.176NA
us-gaap:CostOfGoodsAndServicesSold ▃▂▃▁▁▂█▃▅▂▆▂▃▃▅▂▃350.802334.467351.428329.767322.551341.278450.868365.056387.999346.645407.842336.112367.637357.209398.378332.207352.004NANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:CostsAndExpenses ▆▆▇▇▆▆█▇▇▇▇▆▇▇▇▆▇▄▄▃▃▃▃▃▃▂▃▂▃▂▂▂▂▂▂▂▂▁▂▁▁▁▂▁▁▁892.605878.626934.629906.968873.484894.1731067.354931.355954.88921.645959.273868.95915.24972.276951.615852.434942.119571.655594.53525.333526.699492.837542.147447.692462.716422.504488.139421.549438.059387.532431.95351.962372.06352.749395.088324.638334.76315.615358.231298.534313.975283.786329.23263.359279.965266.635
us-gaap:GainsLossesOnExtinguishmentOfDebt NANA0.0-44.814NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments █▆▅▃▄▄▄▄▄▃▄▃▄▂▃▂▁▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▃▄▃▃▃379.187214.753156.15514.16758.95696.854110.58253.09891.00621.053110.92137.95375.072-42.87128.377-61.94-142.75148.497106.18544.74877.19160.30796.66751.79279.51244.2492.28846.44879.25656.69186.47256.62471.56351.7877.90946.81160.49350.38366.94244.42748.242.61546.72729.38530.40727.566
us-gaap:IncomeTaxExpenseBenefit █▆▅▄▄▅▆▄▃▄▅▅▅▃▁▃▂▄▅▄▅▅▅▅▅▅▅▄▅▅▅▅▅▅▅▅▅▅▅▄▅▄▄▄▄▄107.95150.65336.548-2.7973.87921.75742.88111.71-12.40.25826.96526.228.802-23.284-78.93-13.76-50.512.06439.74914.26429.2820.1430.90421.42628.35715.88933.14412.60226.21618.95525.05418.4325.04915.10519.08615.43619.00916.16221.91813.96315.97713.42410.0339.3110.2948.163
us-gaap:InterestExpense ▆▅▆▆▆▅▆▅▅▅▆▅▇▇▇▇█▂▃▂▃▂▃▂▂▂▂▂▂▂▂▂▂▁▁▁▂▂▂▂▂▂▃▂▂▂27.3926.14928.45430.53830.29626.34929.16224.07324.74924.84727.12726.98437.60435.05939.32338.76243.9565.9068.2715.9327.3566.0067.7796.0495.243.484.7142.6562.682.253.6842.1242.144-2.436-3.348-2.2092.1532.1953.3532.2822.7972.7847.2033.0053.183.384
us-gaap:NetIncomeLoss █▆▅▃▄▄▄▄▅▃▄▃▄▂▅▂▁▃▄▃▄▄▄▃▄▃▄▃▄▄▄▄▄▃▄▃▄▃▄▃▃▃▃▃▃▃271.236164.1119.60716.96455.07775.09767.70141.388103.40620.79584.0211.75346.27-19.587107.307-48.18-92.28136.43366.48530.48447.91140.16765.76330.36651.15528.35159.14433.84653.0437.73661.41838.19446.51436.67558.82331.37541.48434.22145.02430.46432.22329.19136.69420.07520.11319.403
us-gaap:OperatingIncomeLoss █▇▆▄▅▅▅▄▅▄▅▄▄▃▄▂▁▄▅▄▄▄▅▄▄▄▅▄▄▄▅▄▄▄▄▄▄▄▄▄▄▄▄▃▃▃274.714225.412178.1387.6599.651124.718136.13969.147116.00248.799129.60652.72486.096-8.71162.894-24.349-98.38853.514108.68748.72683.29964.429101.62152.47485.2248.68295.8449.39181.76159.1788.75758.74373.98754.00579.66149.76862.72253.55669.46347.2551.56845.78153.07432.76334.2329.198
us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax ▇▇▇▇▇▁█▅▄▅5.4575.276.5134.3792.9-44.73211.205-11.379-24.715-14.505NANA3.09310.114NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax ▅▅▇▅▇▂▅▅▆▄▅▅▁▆▅█▅▅▄▅▅▅▅▄▅▄▄▄▅▅4.6390.67725.4417.49823.817-46.381-4.9093.55312.761-7.2367.2590.964-60.01520.547-4.35146.3191.0244.371-8.357-3.0323.3352.068-1.306-7.96.224-20.107-15.471-12.5880.876-0.278NA4.109-1.22-3.789NA5.383-4.3392.676NANANANANANANANA
us-gaap:OtherComprehensiveIncomeLossNetOfTax ▆▆▇▆▇▁▆▅▅▄▅▆▃▇▆█▆▆▅▆▆▅▆▅▆▅▅▅▆▆▆▆▆▅▅▆▅▆▆▅▅10.26.0530.98511.96226.797-91.0343.326-7.785-11.913-21.699-17.7741.367-56.27630.7172.72447.673-1.0571.851-1.8990.2191.427-5.0284.872-13.6576.711-21.158-19.169-11.9541.4010.2071.6114.376-0.405-3.205-2.7055.05-4.8242.654-0.015-8.555-1.925NANANANANA
us-gaap:OtherNonoperatingIncomeExpense ▃█▅▄▁▃▄▆▄▄▄▄▄▄▄▄▄▄▅▄▄▄▄▅▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄-3.68215.494.3921.869-10.399-1.5150.5798.024-0.247-0.824-1.026-0.8271.120.8991.7951.171-0.4070.8893.321.9541.2481.8841.0595.367-0.468-0.962-0.251-0.2870.175-0.229-0.1520.005-0.280.2110.55-0.748-0.076-0.978-0.417-0.541-0.571-0.382-0.3-0.373-0.6431.752
us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax █▇▇▆▆▇█▆▇▆▇▆▆▆▇▅▅▄▄▃▃▃▄▃▃▂▃▂▃▂▃▂▂▂▂▂▂▂▂▁▂▁▂▁▁▁1167.3191104.0381112.759994.618973.1351018.8911203.4931000.5021070.882970.4441088.879921.6741001.336963.5651014.509828.085843.731625.169703.217574.059609.998557.266643.768500.166547.936471.186583.979470.94519.82446.702520.707410.705446.047406.754474.749374.406397.482369.171427.694345.784365.543329.567382.304296.122314.195295.833
us-gaap:Revenues █▇▇▆▆▇█▆▇▆▇▆▆▆▇▅▅▄▄▃▃▃▄▃▃▂▃▂▃▂▃▂▂▂▂▂▂▂▂▁▂▁▂▁▁▁1167.3191104.0381112.759994.618973.1351018.8911203.4931000.5021070.882970.4441088.879921.6741001.336963.5651014.509828.085843.731625.169703.217574.059609.998557.266643.768500.166547.936471.186583.979470.94519.82446.702520.707410.705446.047406.754474.749374.406397.482369.171427.694345.784365.543329.567382.304296.122314.195295.833
us-gaap:SellingGeneralAndAdministrativeExpense ▇▇▇▇▇▇█▇▇▇▇▆▆▇▇▆▆▄▄▃▃▃▃▃▃▃▃▂▂▂▂▂▂▂▂▂▂▂▂▁▁▁▁▁▁▁488.496487.255525.976521.508494.84496.639557.519512.159514.976518.77488.056447.537460.803487.745465.371421.163408.226304.244289.862269.902272.009257.411258.809236.355237.991229.522235.888217.025218.537204.617212.805181.546185.629180.478186.216164.888165.221162.518170.816148.461152.758141.672154.796127.488130.322130.568
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:Assets ███▇▇▇█▇▇▇▇▆▇████▃▂▂▂▂▂▂▂▂▂▂▂▂▂▁▁▁▁▁▁▁▁▁▁▁▁7188.346937.8587315.9676840.6026810.2946800.3467151.2946737.3446729.6416714.6756201.4745944.8176152.9376915.0287283.1737011.4926994.8873365.32367.3352277.742304.5212211.5092174.6862091.5421861.0391789.371904.3511768.9531796.8081757.7131783.5821628.3981613.7871567.3951621.2771479.1481380.1151349.8481379.8721304.4311295.9721275.3741285.658NANANA
us-gaap:Liabilities █▇▇▇▇▇▇▇▇▇▆▆▆▇█▇▇▄▃▃▃▃▃▂▂▂▂▂▂▂▁▁▁▁▁▁▁▁▁▁▁▁▁6660.7026046.2646225.5395803.0995819.0755910.0716212.7015817.6875765.8395857.7785350.7175003.2695231.5055927.4576299.7086148.0826141.2123262.4832306.4572288.2382357.3492324.1792307.0862251.1312031.1941928.8831743.181616.431599.2991520.991422.2661306.7631285.0931248.2381314.6041217.6831165.1241178.0671198.0881110.3641080.1531065.3441098.602NANANA
us-gaap:LiabilitiesAndStockholdersEquity ███▇▇▇█▇▇▇▇▆▇████▃▂▂▂▂▂▂▂▂▂▂▂▂▂▁▁▁▁▁▁▁▁▁▁▁▁7188.346937.8587315.9676840.6026810.2946800.3467151.2946737.3446729.6416714.6756201.4745944.8176152.9376915.0287283.1737011.4926994.8873365.32367.3352277.742304.5212211.5092174.6862091.5421861.0391789.371904.3511768.9531796.8081757.7131783.5821628.3981613.7871567.3951621.2771479.1481380.1151349.8481379.8721304.4311295.9721275.3741285.658NANANA
us-gaap:StockholdersEquity ▅▇██▇▇▇▇▇▇▇▇▇▇▇▇▇▃▂▂▂▁▁▁▁▁▃▃▃▃▄▄▄▄▄▃▃▃▃▃▃▃▃527.638891.5941090.4281037.503991.219890.275938.593919.657963.802856.897850.757941.548921.432987.571983.465863.41853.675102.81760.878-10.498-52.828-112.67-132.4-159.589-170.155-139.513161.171152.523197.509236.723361.316321.635328.694319.157306.673261.465214.991171.781181.784194.067215.819210.03187.056NANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:AssetsCurrent ▇▆▇▅▅▅▆▅▅▅▅▄▅▇█▅▅▇▄▃▃▃▃▃▃▂▃▂▂▂▃▂▂▂▂▂▁▁▁▁▁▁▁2257.1661997.8562323.0581865.4041767.1851772.6182018.7411706.5051691.1041716.0131811.7391535.341608.4842310.6622588.6081812.2831759.9742175.6951343.1961245.9491233.6561179.2771140.9971061.3991066.0681000.6481096.658959.234971.769945.6681084.882935.155923.358875.04927.466781.978686.35676.82705.785633.686625.609616.24621.102NANANA
us-gaap:CashAndCashEquivalentsAtCarryingValue ▅▃▅▄▃▂▂▂▂▁▁▂▁▂▄▄▄█▃▃▃▃▃▃▃▂▃▂▂▂▃▃▂▂▂▂▁▁▁▁▁▁▁▁▁▁796.257445.995712.583553.715356.633227.85280.836306.727218.453149.27156.368210.997141.805189.979538.908630.016589.2821227.891474.233465.734445.053403.943372.976371.244357.581281.653365.302341.22317.925283.284423.99374.521333.363269.063299.852255.391150.531138.985142.739156.903125.341109.003120.181148.412122.364105.913
us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents ▅▃▅▄▂▁▂▂▁▁▁▁▁▁▄▄▄█▃800.457445.995712.583553.715356.633227.85280.836306.727218.453149.27158.663213.292159.956227.63567.058648.176632.5671271.162499.354NANANA412.107NANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:AccountsReceivableNetCurrent ▆▇▇▅▆▇█▆▆▇▇▆▆▇▇▅▅▄▃▃▃▃▃▂▂▂▂▂▂▂▂▁▂▂▂▁▁▁▂▁▁▁▁1102.5621175.4261241.508948.8641048.5191148.5651326.0121028.321112.8561178.8591255.118979.1811083.991134.9641176.843874.283886.393716.487643.013560.202613.795602.877580.763482.302527.615526.384552.107449.923493.216496.997490.923392.174432.011441.405463.968370.951389.414384.125421.033349.287360.564345.035364.818NANANA
us-gaap:PrepaidExpenseAndOtherAssetsCurrent ▄▄▄▆▅▆▅▇▆▆▆▇█▇▄▆▅▃▂▄▁▁▁▄▂▃▁▃▂▂▁▃▂▂▂▃▂▂▁▂▂▃▁109.9118.479109.212154.887128.631156.026146.026173.851148.14156.42165.237178.436199.208175.204124.632164.921141.23791.54684.54107.31663.72554.33262.427114.06182.66188.20663.86887.49271.93967.77763.68291.0780.181.64375.71389.76678.09578.24463.52166.86973.83892.22164.148NANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:NoncurrentAssets NANA1240.364NANANA1269.74NANANA424.034NANANA415.249NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:NoncurrentAssets us-gaap:StatementGeographical it:OtherInternationalNANA153.609NANANA159.037NANANA50.8NANANA41.674NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:NoncurrentAssets us-gaap:StatementGeographical it:UnitedStatesAndCanadaNANA820.973NANANA867.974NANANA305.928NANANA288.735NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:NoncurrentAssets us-gaap:StatementGeographical us-gaap:EMEANANA265.782NANANA242.729NANANA67.306NANANA84.84NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:PropertyPlantAndEquipmentGross NANA676.368NANANA635.935NANANA514.362NANANA432.019NANANA306.125NANANA274.37NANANA259.608NANANA240.925NANANA229.42NANANA229.334NANANA202.597NANANA
 us-gaap:PropertyPlantAndEquipmentGross us-gaap:PropertyPlantAndEquipmentByType it:EquipmentAndFurnitureNANA114.622NANANA104.37NANANA85.002NANANA67.288NANANA43.137NANANA39.072NANANA37.221NANANA34.024NANANA29.907NANANA34.828NANANANANANANA
 us-gaap:PropertyPlantAndEquipmentGross us-gaap:PropertyPlantAndEquipmentByType us-gaap:ComputerSoftwareIntangibleAssetNANA277.973NANANA256.451NANANA210.955NANANA189.015NANANA166.385NANANA148.195NANANA144.293NANANA136.64NANANANANANANANANANANANANANANA
 us-gaap:PropertyPlantAndEquipmentGross us-gaap:PropertyPlantAndEquipmentByType us-gaap:LeaseholdImprovementsNANA283.773NANANA275.114NANANA218.405NANANA175.716NANANA96.603NANANA87.103NANANA78.094NANANA70.261NANANA64.346NANANA63.773NANANANANANANA
us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment NANA339.603NANANA291.356NANANA246.697NANANA210.512NANANA184.519NANANA165.637NANANA161.618NANANA149.166NANANA-140.331NANANA161.202NANANA154.983NANANA
us-gaap:AmortizationOfIntangibleAssets ▄▄▄▄▄▄▄▄▄▅▅▆▆▇▇▆█▂▂▂▂▂▂▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁26.15430.51430.44431.22831.20832.17932.17231.69432.16433.68334.37550.950.12751.64653.351.22465.56.296.1836.2216.216.1836.3592.7372.1072.1392.4632.5051.9791.2791.3571.3511.4041.3341.3731.3620.9280.7390.7370.7392.5222.5272.5312.5312.5372.926
us-gaap:PropertyPlantAndEquipmentNet ▇▇█████▇▇▆▆▆▅▅▅▅▅▃▃▃▃▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▁▁▁▁309.222322.61336.765332.891343.563346.579344.579300.612291.28271.448267.665246.061225.901223.086221.507216.021197.129126.419121.606118.789117.255108.628108.733109.557107.112104.37497.9993.62595.83194.20891.75990.19889.41588.50889.08980.34477.79569.66368.13257.10952.92245.44347.614NANANA
us-gaap:Goodwill ▇▇▇▇▇▇▇▇▇▇▇▇▇▇███▂▂▂▂▂▂▂▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁2955.4662943.52945.5472938.7082935.6092927.6662937.7262939.7072930.2972906.7362923.1362910.8492974.5132956.6422987.2943145.0463169.893855.33738.453742.926742.752718.034715.359723.95583.002579.91586.665593.212598.731589.786519.203518.555516.144516.525519.506519.2515.002510.933508.55510.227516.027514.676510.265NANANA
us-gaap:IntangibleAssetsNetExcludingGoodwill ▄▄▅▅▅▅▅▅▅▅▆▆▆▆▇██▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁775.479777.441806.998820.994847.375864.15925.087936.313973.4371016.0551042.5651085.7361177.2971247.7711292.0221564.4651595.37681.20976.80181.76999.26790.55396.54496.17427.1128.45630.68933.51536.41534.5376.1077.5358.83410.47711.82113.14214.0526.3217.067.7988.53711.05913.584NANANA
us-gaap:FiniteLivedIntangibleAssetsNet ▄▄▅▅▅▅▅▅▅▅▆▆▆▆▇██▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁775.479777.441806.998820.994847.375864.15925.087936.313973.4371016.0551042.5651085.7361177.2971247.7711292.0221564.4651595.37681.20976.80181.76999.26790.55396.54496.17427.1128.45630.68933.51536.41534.5376.1077.5358.83410.47711.82113.14214.0526.3217.067.7988.5377.0613.584NANANA
us-gaap:OperatingLeaseRightOfUseAsset ▁▂▃▄▅▆█▄▃▂618.132633.796647.283651.813668.51678.018702.916652.273637.701634.142NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:OtherAssetsNoncurrent ██▇▇▇▆▆▅▆▄▄▄▄▅▅██▃▁▂▂▂▂▂▁▁▂▂▂▂▁▁▁▁▁▁▁▁▂▂▂▂▂272.875262.655256.316230.792248.052211.315222.245201.934205.822170.281156.369166.831166.742176.867193.742273.677272.515126.64787.27988.307111.591115.017113.053100.46277.74775.98292.34989.36794.06293.51481.63176.95576.03676.84573.39584.48486.91686.11190.34595.61192.87787.95693.093NANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:AccountsPayableAndAccruedLiabilitiesCurrent ▆▆█▇▆▄▇▅▅▄▆▅▄▄▆▅▄▃▄▃▂▂▃▂▂▂▃▂▂▂▃▂▂▁▂▂▁▁▂▁▁▁▂752.241703.439952.431790.26736.039533.951788.796593.695564.672526.551710.113599.655542.071532.538666.821550.207517.118331.828440.771348.429287.476247.423387.691290.044262.293240.301353.761266.545251.421211.566325.059224.873204.35180.896287.763206.29178.528160.093259.49183.599172.314143.517247.733NANANA
us-gaap:AccountsPayableCurrent NANA38.588NANANA32.995NANANA37.508NANANA49.0NANANA41.009NANANA31.57NANANA16.802NANANA17.671NANANA27.344NANANA27.573NANANA17.791NANANA
us-gaap:ContractWithCustomerLiabilityCurrent █▇▆▂▃▄▅▃▃▄▃▁▂▂▁2152.0432088.4631974.5481710.7911765.2641847.3841928.021803.1351796.3311837.5041745.2441650.6471687.7241719.6371630.198NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LiabilitiesCurrent ▇▇▇▆▆▆▇▆▆▆▆▆▆█▇▆▅▃▃▃▃▂▃▂▂▃▂▃▃▂▂▂▂▂▂▂▁▁▁▁▁▁▁2909.6062812.4212947.4942521.5622539.3222530.3382856.5342527.2632482.1512568.9182620.9352343.5962513.8043185.8562822.5852482.0352243.9071470.3561460.2491417.4241387.2411291.2241323.4921235.11204.521420.7311215.2181358.8721345.5481266.6211159.9231043.9931014.84975.0921070.0968.893908.357911.052921.137834.492799.367784.218811.152NANANA
us-gaap:LongTermDebtCurrent ▁▁▁▁▁▂▂▂▂▃▂▂▃█▄▅▃▁▁▁▂▁▁▁▁▃▁▃▃▃▂▂▁▁▂▂▂▂▁▁▁▂▁5.32220.51920.51520.51138.019149.003139.718130.433121.148204.863165.57893.294284.009789.724379.721419.601277.57829.36630.040.070.057.535.020.020.0285.020.0245.0246.25222.568.7565.061.2557.590.080.070.088100.29350.052.555.082.66740.156NANANA
us-gaap:OperatingLeaseLiabilityCurrent █▆▄▁86.38185.1583.99582.391NANA76.516NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:OtherAccruedLiabilitiesCurrent NANA135.814NANANA147.078NANANA183.222NANANA134.421NANANA95.316NANANA51.068NANANA43.463NANANA57.274NANANA34.852NANANA31.163NANANA22.445NANANA
us-gaap:TaxesPayableCurrent NANA29.55NANANA7.878NANANA19.725NANANA46.758NANANA20.378NANANA13.714NANANA18.538NANANA14.392NANANA18.897NANANA15.917NANANA15.03NANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
 us-gaap:LongTermDebt us-gaap:DebtInstrument,us-gaap:LongtermDebtType it:SeniorNotesDue2028,us-gaap:SeniorNotes█▇▅▄▁791.302791.041790.783790.5790.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:LongTermDebt us-gaap:DebtInstrument,us-gaap:LongtermDebtType it:SeniorNotesDue2029,us-gaap:SeniorNotes592.742NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:LongTermDebt us-gaap:DebtInstrument,us-gaap:LongtermDebtType it:SeniorNotesDue2030,us-gaap:SeniorNotes█▆▃▁791.087790.888790.69790.5NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:LongTermDebt us-gaap:LongtermDebtType us-gaap:SeniorNotes█▁▁2175.1311581.9291581.473NANA785.6785.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LongTermDebtNoncurrent ▆▅▅▅▅▅▅▅▅▆▆▆▆▆▇▇█▄▂▂▂▃▃▃▂▂▂▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁2457.8541949.0781958.2861957.4731937.2322035.2732043.8882051.5072059.1312094.7582116.1092077.4662146.8292186.0612899.1242922.2293140.3071599.331664.391696.405756.015832.5790.0820.0695.0380.0385.0125.0128.75132.5136.25140.0143.75147.5115.0120.0130.0140.0150.0157.5165.0172.5180.0NANANA
us-gaap:DeferredIncomeTaxLiabilitiesNet NANA173.233NANANA189.814NANANA214.687NANANA206.338NANANA22.52NANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:DeferredIncomeTaxLiabilitiesNet us-gaap:BalanceSheetLocation us-gaap:OtherLiabilitiesNANA173.2NANANA189.8NANANA214.7NANANA253.7NANANA22.5NANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent NANA33.661NANANA29.059NANANA25.43NANANA26.975NANANA23.935NANANA22.68NANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:OtherLiabilitiesNoncurrent ▆▅▆▆▆▆▅▅▅▄▆▆▆▆▆██▂▂▂▂▂▂▂▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁548.134519.64539.593538.359540.402530.577479.746462.355456.314424.947613.673582.207570.872555.54577.999743.818756.998192.796181.817174.409214.093200.455193.594196.031131.674128.152142.962132.558125.001121.869126.093122.77126.503125.646129.604128.79126.767127.015126.951118.372115.786108.626107.45NANANA
us-gaap:OperatingLeaseLiabilityNoncurrent ▇▇▇████▇▇▇▁745.108765.125780.166785.705802.119813.883832.533776.562768.243769.155165.374NANANA115.84NANANA38.042NANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo NANA133.854NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree NANA130.627NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour NANA120.092NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive NANA115.279NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive NANA549.496NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:StockholdersEquity ▅▇██▇▇▇▇▇▇▇▇▇▇▇▇▇▃▂▂▂▁▁▁▁▁▃▃▃▃▄▄▄▄▄▃▃▃▃▃▃▃▃527.638891.5941090.4281037.503991.219890.275938.593919.657963.802856.897850.757941.548921.432987.571983.465863.41853.675102.81760.878-10.498-52.828-112.67-132.4-159.589-170.155-139.513161.171152.523197.509236.723361.316321.635328.694319.157306.673261.465214.991171.781181.784194.067215.819210.03187.056NANANA
us-gaap:CommonStockValue █████████████████▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁0.0820.0820.0820.0820.0820.0820.0820.0820.0820.0820.0820.0820.0820.0820.0820.0820.0820.0780.0780.0780.0780.0780.0780.0780.0780.0780.0780.0780.0780.0780.0780.0780.0780.0780.0780.0780.0780.0780.0780.0780.0780.0780.078NANANA
us-gaap:AdditionalPaidInCapital █████▇▇▇▇▇▇▇▇▇▇▇▇▂▂▂▂▂▂▂▂▂▂▂▂▂▂▁▁▁▁▁▁▁▁▁▁▁▁2031.7262003.4731968.931960.1431941.5091922.6081899.2731885.371868.8781852.6181823.711810.5451798.0751788.0451761.3831748.611732.56880.877863.127851.077847.451832.973818.546806.537795.408781.934764.433754.827743.02733.139718.644707.439698.293689.182679.871671.255661.05651.372646.815636.797628.545619.771611.782NANANA
us-gaap:RetainedEarningsAccumulatedDeficit █▇▇▆▆▆▆▅▅▅▅▅▅▄▄▄▄▅▄▄▄▄▄▄▄▃▃▃▃▃▃▂▂▂▂▂▂▂▁▁▁▁▁2690.8032419.5672255.4672135.862118.8962063.8191988.7221921.0211879.6331776.2271755.4321671.4121659.6581613.981647.2841539.9781588.1581680.4391644.0051577.5211538.7621490.8511450.6841384.9221354.5551303.4011275.0491215.9051182.0591129.0191091.2831029.865991.671945.157908.482849.659818.284776.801742.579697.555667.091634.868605.677NANANA
us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax ▄▄▃▂▂▁▄▄▄▅▅▆▆█▇▇▅▅▅▅▅▅▅▅▆▅▆▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇-82.978-93.178-99.228-130.213-142.175-168.972-77.938-81.264-73.479-61.566-39.867-22.684-24.05132.2251.508-1.216-48.889-47.832-49.683-47.784-48.003-49.43-44.402-49.274-35.617-42.328-21.17-2.0019.9538.5528.3456.7342.3582.7635.9688.6733.6238.4475.7935.8114.36316.28814.638NANANA
us-gaap:TreasuryStockValue █▆▆▅▅▅▅▅▅▅▅▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▃▃▃▂▂▂▂▂▂▂▂▂▁▁▁▁▁4111.9953438.353034.8232928.3692927.0932927.2622871.5462805.5522711.3122710.4642688.62517.8072512.3322446.7612426.7922424.0442418.2362410.7452396.6492391.392391.1162387.1422357.3062301.8522284.5792182.5981857.2191816.2861737.6011634.0651457.0341422.4811363.7061318.0231287.7261268.21268.0441264.9171213.4811146.1731094.2581060.9751045.119NANANA
us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue ▁█26.1936.086NA15.50115.67825.12911.11512.95413.1231.81910.15410.71814.34230.958NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:NetCashProvidedByUsedInOperatingActivities █▃▄▄▅▂▂▄▄▂▂▄▃▁▂▃▃▁▂▃▃▁▂▃▃▁▂▃▃▂▂▃▃▂▂▃▂▂▂▃▂▁▂▂▂▁575.347157.298260.448243.913343.16855.74982.835219.523227.48235.59645.147249.264174.0232.72422.25149.549112.323-29.60583.369128.949148.4528.5879.254116.904143.745.66371.17122.851136.28816.4773.585101.753120.62319.69371.062109.29980.77318.67979.101112.55288.576-24.66379.12464.78369.558-7.966
us-gaap:NetCashProvidedByUsedInInvestingActivities ▇▇▇▇▇▇▇▇▇▇▇▇█▇▇▇▁▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇-34.732-12.521-23.043-14.98-21.329-24.536-62.889-36.222-39.419-22.355-56.17273.807383.095-16.679-35.146-46.459-2523.954-140.015-17.809-11.007-47.873-7.36-10.812-207.931-11.982-11.632-15.37-6.365-16.587-124.455-8.726-8.137-9.987-9.648-13.537-10.985-23.033-7.118-18.234-14.26-5.755-3.705-9.483-4.518-4.736-15.108
us-gaap:NetCashProvidedByUsedInFinancingActivities ▂▂▃▃▂▃▃▃▂▃▃▂▁▂▃▃█▆▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃-187.017-403.22-98.199-42.272-207.263-68.49-53.179-90.685-118.69-23.438-43.559-266.303-618.17-329.083-65.737-80.3271768.623917.271-43.753-97.162-60.61526.844-66.495115.306-62.091-54.41-12.184-78.377-85.833-32.276-16.002-56.769-44.178-36.906-14.1960.734-41.552-17.556-75.418-61.413-67.51417.786-98.035-45.235-43.01614.73
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:AmortizationOfFinancingCosts ▂▂▂▃▄▃▃▃▃▃▃▃█▃▃▄█▂▂▂▃▂▁▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂0.9910.9230.9372.0953.7551.6371.6321.6271.6221.6161.611.6048.7331.8681.8263.7619.0070.4680.4710.4531.7470.411-0.880.7970.7580.8371.0730.4720.5190.5810.6030.6350.6140.8580.4960.5040.4990.5090.5550.5510.5870.5950.7820.2540.2590.272
us-gaap:DeferredIncomeTaxExpenseBenefit ▇▇▅▇▅█▆▇▆▅▇▇█▅▁▆▃▆▇▆▇▇▇▆▇▇▇▆▇▇▇▇▇▇▇▇▇▇▇▇▇▆▇▆▇▇-1.5893.883-36.452-4.735-27.3525.537-20.682-1.376-23.884-25.534.67113.27321.156-39.175-116.857-21.446-66.006-11.99811.379-12.571.346-2.1915.688-8.0225.656-3.3581.885-5.749-2.9017.35111.6746.7360.125-1.8724.2410.133-1.737-1.664-4.7775.2079.591-10.9864.09-5.9920.166-0.873
 us-gaap:DepreciationDepletionAndAmortization us-gaap:ConsolidationItems it:CorporateAndReconcilingItems▅▅▅▅▅▅▅▅▅▅▅▇▆▇▇▇█▂▂▁▁▁▁▁▁52.00556.26456.38153.97153.93654.69653.6652.39852.26353.45852.5268.18766.83868.05671.5268.56483.55716.5315.96515.75215.23515.01715.20911.24710.547NANANANANANANANANANANANANANANANANANANANANA
us-gaap:IncreaseDecreaseInAccountsReceivable ▂▂▇▁▁▁▇▂▂▂▇▂▃▂█▃▃▄▄▂▃▃▄▂▃▃▅▂▃▃▄▂▂▃▂▄▃▂▄▃▃▃▄▃▃▃-78.458-54.192269.71-107.995-125.463-135.661281.861-74.291-62.451-78.39287.682-91.457-24.451-56.771353.426-29.849-12.9857.91994.903-46.6221.29119.089101.521-43.463-3.951-9.631113.789-34.456-7.1194.2197.829-42.661-44.92217.851-92.77484.8179.035-39.69574.91-4.10813.829-25.74463.3256.211-12.56-8.799
us-gaap:NetCashProvidedByUsedInOperatingActivities █▃▄▄▅▂▂▄▄▂▂▄▃▁▂▃▃▁▂▃▃▁▂▃▃▁▂▃▃▂▂▃▃▂▂▃▂▂▂▃▂▁▂▂▂▁575.347157.298260.448243.913343.16855.74982.835219.523227.48235.59645.147249.264174.0232.72422.25149.549112.323-29.60583.369128.949148.4528.5879.254116.904143.745.66371.17122.851136.28816.4773.585101.753120.62319.69371.062109.29980.77318.67979.101112.55288.576-24.66379.12464.78369.558-7.966
us-gaap:NetIncomeLoss █▆▅▃▄▄▄▄▅▃▄▃▄▂▅▂▁▃▄▃▄▄▄▃▄▃▄▃▄▄▄▄▄▃▄▃▄▃▄▃▃▃▃▃▃▃271.236164.1119.60716.96455.07775.09767.70141.388103.40620.79584.0211.75346.27-19.587107.307-48.18-92.28136.43366.48530.48447.91140.16765.76330.36651.15528.35159.14433.84653.0437.73661.41838.19446.51436.67558.82331.37541.48434.22145.02430.46432.22329.19136.69420.07520.11319.403
us-gaap:ShareBasedCompensation ▆█▁▃▃▅▂▃▃▇▂▂▃▇▂▃▇▅▂▂▂▃▂▂▂▃▂▂▁▃▁▁▁▂▁▂▁▂▁▁▁▂▂▁▁▂26.1936.0866.23215.50115.67825.12911.11512.95413.1231.81910.15410.71814.34230.95811.01314.35730.99722.57610.5339.52111.11215.4959.1699.58810.66316.7299.428.8086.86513.7527.6867.47.212.3428.3579.27.910.9398.1157.87.89.1629.3367.36.89.159
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:NetCashProvidedByUsedInInvestingActivities ▇▇▇▇▇▇▇▇▇▇▇▇█▇▇▇▁▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇-34.732-12.521-23.043-14.98-21.329-24.536-62.889-36.222-39.419-22.355-56.17273.807383.095-16.679-35.146-46.459-2523.954-140.015-17.809-11.007-47.873-7.36-10.812-207.931-11.982-11.632-15.37-6.365-16.587-124.455-8.726-8.137-9.987-9.648-13.537-10.985-23.033-7.118-18.234-14.26-5.755-3.705-9.483-4.518-4.736-15.108
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:NetCashProvidedByUsedInFinancingActivities ▂▂▃▃▂▃▃▃▂▃▃▂▁▂▃▃█▆▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃-187.017-403.22-98.199-42.272-207.263-68.49-53.179-90.685-118.69-23.438-43.559-266.303-618.17-329.083-65.737-80.3271768.623917.271-43.753-97.162-60.61526.844-66.495115.306-62.091-54.41-12.184-78.377-85.833-32.276-16.002-56.769-44.178-36.906-14.1960.734-41.552-17.556-75.418-61.413-67.51417.786-98.035-45.235-43.01614.73
us-gaap:ProceedsFromIssuanceOfLongTermDebt NANA0.01200.0800.00.00.00.0-30.035.00.00.00.00.00.0140.01930.0955.0-32.5-82.5760.070.0-10.0130.055.0265.0225.625-1.2523.75151.8751.8751.8751.875200.012.57.412-32.70547.793-5.0-5.0-30.01140.011173.0-36.011.052.0
 us-gaap:ProceedsFromIssuanceOfLongTermDebt us-gaap:DebtInstrument,us-gaap:LongtermDebtType it:A2020CreditAgreement,it:TermLoanFacilityNANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:RepaymentsOfLongTermDebt ▂▂▂█▆▂▂▂▂▂▁▃▅▃▂▃▂▂▂▂▆▂▂▂▂▂▃▂▂▂▂▂▂▃▂▂▂▂▂▂▂▂▃▂▂▂100.1295.1275.1271200.248852.1270.967-0.033-0.03590.96518.682-109.318261.681553.796304.81364.814219.812101.03918.7737.57.5815.05.05.05.05.05.0190.6253.753.751.8751.8751.8751.875200.07.57.57.57.55.05.05.1565.0252.84421.021.014.0
us-gaap:PaymentsForRepurchaseOfCommonStock █▅▂▁▁▂▂▂▁▁▃▁▂▁▁▁▁▁▁▁▁▁▂▁▂▄▁▂▂▃▁▂▁▁▁▁▁▂▂▂▁▂▁▁▁▁684.9398.45100.1852.2550.69873.16457.60694.8781.71944.839156.4328.12967.87728.3944.0843.27511.80821.9786.0720.9226.4845.48756.04911.558117.4324.04244.8879.678111.598195.8524.48559.25149.47348.52722.0044.6257.51877.15770.77253.35535.96351.89623.3441.37239.93235.172
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31

Common Stock Value

us-gaap:CommonStockValue

us-gaap:CommonStockValue


Common
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value82000.082000.082000.082000.082000.082000.082000.082000.082000.082000.082000.082000.082000.082000.082000.082000.082000.078000.078000.078000.078000.078000.078000.078000.078000.078000.078000.078000.078000.078000.078000.078000.078000.078000.078000.078000.078000.078000.078000.078000.078000.078000.078000.078000.0
Percentage of CommonStockValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Weighted Average Number Of Diluted Shares Outstanding

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding


Weighted
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value8689898990909191929291908984838383848487899093949595959596989999989899
Percentage of WeightedAverageNumberOfDilutedSharesOutstanding100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Weighted Average Number Of Shares Outstanding Basic

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic


Weighted
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value8588898989899089909191908982828282828386888991929393939393969696959595
Percentage of WeightedAverageNumberOfSharesOutstandingBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount

us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount

us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount


Antidilutive
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-30
Value100000.0400000.0500000.01300000.0700000.0300000.0300000.0200000.01400000.01300000.01300000.01400000.0400000.0400000.0200000.0300000.0400000.0300000.0300000.0200000.0400000.0400000.0200000.0400000.0400000.0200000.0400000.0700000.0600000.01600000.0800000.01200000.01000000.01600000.0
Percentage of AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Earnings Per Share Basic

us-gaap:EarningsPerShareBasic

us-gaap:EarningsPerShareBasic


Earnings
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value3.161.861.340.190.620.840.760.461.150.230.930.130.51-0.221.23-0.53-1.030.440.80.370.580.490.790.370.610.330.670.380.590.410.670.410.50.390.630.340.440.370.480.320.330.30.390.210.210.2
Percentage of EarningsPerShareBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Earnings Per Share Diluted

us-gaap:EarningsPerShareDiluted

us-gaap:EarningsPerShareDiluted


Earnings
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value3.131.841.330.190.610.830.740.461.130.230.910.130.5-0.221.23-0.53-1.030.430.790.360.570.480.770.360.610.320.660.380.580.40.650.40.490.380.610.330.430.360.470.310.320.290.360.20.20.19
Percentage of EarningsPerShareDiluted100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Allocated Share Based Compensation Expense

us-gaap:AllocatedShareBasedCompensationExpense

us-gaap:AllocatedShareBasedCompensationExpense


Allocated
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-30
Value26366.3151525111313311010143010143122109.511159.19.610169.48.86.9137.6517.47.2
Percentage of AllocatedShareBasedCompensationExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestIncomeOperating0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AllocatedShareBasedCompensationExpense us-gaap:AwardType

it:CommonStockEquivalents


Allocated
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302012-06-302011-06-30
Value0.20.20.10.20.20.20.10.20.20.20.20.10.20.20.20.10.10.20.20.20.20.20.1
Percentage of AllocatedShareBasedCompensationExpense0.80.61.61.31.30.80.91.51.50.62.00.91.40.61.80.70.30.91.92.11.80.00.0
Percentage of InterestIncomeOperating0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of InterestIncomeOperating it:CommonStockEquivalents0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

it:RetirementEligibleEmployeesEquityAward


Allocated
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-30
Value1121-2.33.45.211-0.30.40.520-1.80.32.1170.32.16.0142.53.8103.03.9102.92.17.71.81.7
Percentage of AllocatedShareBasedCompensationExpense43.159.6-36.521.933.146.2-2.73.13.865.7-17.62.814.657.62.814.619.464.226.334.266.531.236.462.933.030.455.824.323.6
Percentage of InterestIncomeOperating0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of InterestIncomeOperating it:RetirementEligibleEmployeesEquityAward0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:RestrictedStockUnitsRSU


Allocated
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302012-12-312012-09-302012-06-302011-12-312011-09-302011-06-30
Value24334.1131323101112279.39.81227-61.61329199.18.09.6137.88.39.3148.27.65.7116.46.25.96.96.76.77.06.76.8
Percentage of AllocatedShareBasedCompensationExpense91.693.965.185.286.692.491.090.891.687.191.291.689.688.0-565.191.795.286.785.884.286.587.785.786.586.986.287.286.482.684.883.683.881.90.00.00.00.00.00.0
Percentage of InterestIncomeOperating0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of InterestIncomeOperating us-gaap:RestrictedStockUnitsRSU0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:StockAppreciationRightsSARS


Allocated
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302012-12-312012-09-302012-06-302011-12-312011-09-302011-06-30
Value2.02.02.12.11.91.70.91.00.93.90.70.81.33.50.41.11.42.81.31.31.31.71.21.11.22.11.11.01.01.91.11.11.21.42.41.01.01.00.9
Percentage of AllocatedShareBasedCompensationExpense7.65.533.313.512.16.88.17.76.912.36.97.59.011.33.77.64.512.412.313.711.711.013.211.511.212.611.711.414.513.814.414.916.70.00.00.00.00.00.0
Percentage of InterestIncomeOperating0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of InterestIncomeOperating us-gaap:StockAppreciationRightsSARS0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AllocatedShareBasedCompensationExpense us-gaap:IncomeStatementLocation

us-gaap:CostOfSales


Allocated
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-30
Value8.0134.46.17.1125.46.26.2115.34.76.7114.36.16.39.34.94.64.97.64.54.54.76.94.14.03.75.83.33.23.2
Percentage of AllocatedShareBasedCompensationExpense30.538.069.839.445.248.248.647.747.335.552.043.946.536.939.442.420.341.246.248.444.149.049.546.943.941.343.645.553.642.043.143.244.4
Percentage of InterestIncomeOperating0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of InterestIncomeOperating us-gaap:CostOfSales0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:SellingGeneralAndAdministrativeExpenses


Allocated
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-30
Value18221.99.48.6135.66.76.7204.85.77.5184.77.110135.74.96.27.94.65.16.09.85.34.83.28.04.44.24.0
Percentage of AllocatedShareBasedCompensationExpense69.562.030.260.654.851.850.551.551.164.247.153.352.158.943.149.333.258.853.851.655.951.050.553.156.158.756.454.546.458.057.556.855.6
Percentage of InterestIncomeOperating0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of InterestIncomeOperating us-gaap:SellingGeneralAndAdministrativeExpenses0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AllocatedShareBasedCompensationExpense us-gaap:TitleOfIndividual, us-gaap:AwardType

srt:ExecutiveOfficer, us-gaap:PerformanceShares


Allocated
Period End2021-06-302021-03-31
Value0.06.5
Percentage of AllocatedShareBasedCompensationExpense0.018.0
Percentage of InterestIncomeOperating0.00.0
Percentage of InterestIncomeOperating srt:ExecutiveOfficer us-gaap:PerformanceShares0.00.0

Comprehensive Income Net Of Tax

us-gaap:ComprehensiveIncomeNetOfTax

us-gaap:ComprehensiveIncomeNetOfTax


Comprehensive
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value2811701502881-15.937713391-0.9046613-10.00611110-0.507-93.33838643049357016577.19339215437634246335636363645213030362817
Percentage of ComprehensiveIncomeNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestIncomeOperating0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Cost Of Goods And Services Sold

us-gaap:CostOfGoodsAndServicesSold

us-gaap:CostOfGoodsAndServicesSold


Cost
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value350334351329322341450365387346407336367357398332352
Percentage of CostOfGoodsAndServicesSold100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestIncomeOperating0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:CostOfGoodsAndServicesSold us-gaap:ConsolidationItems

it:CorporateAndReconcilingItems


Cost
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value107.7955.3057.6824.352-0.822121.0594.22-1.037-7.35-0.258118.458-3.0343.7587.309
Percentage of CostOfGoodsAndServicesSold3.12.31.52.31.3-0.22.90.31.1-0.3-1.8-0.13.12.4-0.81.12.1
Percentage of InterestIncomeOperating0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of InterestIncomeOperating it:CorporateAndReconcilingItems0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Costs And Expenses

us-gaap:CostsAndExpenses

us-gaap:CostsAndExpenses


Costs
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value8928789349068738941067931954921959868915972951852942571594525526492542447462422488421438387431351372352395324334315358298313283329263279266
Percentage of CostsAndExpenses100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestIncomeOperating0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Gains Losses On Extinguishment Of Debt

us-gaap:GainsLossesOnExtinguishmentOfDebt

us-gaap:GainsLossesOnExtinguishmentOfDebt


Gains
Period End2020-12-312020-09-30
Value0-44814000.0
Percentage of GainsLossesOnExtinguishmentOfDebt0.0100.0
Percentage of InterestIncomeOperating0.00.0

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

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value3792141561458961105391211103775-42.87128-61.94-142.75148106447760965179449246795686567151774660506644484246293027
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestIncomeOperating0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Income Tax Expense Benefit

us-gaap:IncomeTaxExpenseBenefit

us-gaap:IncomeTaxExpenseBenefit


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value1075036-2.7973.879214211-12.40.258262628-23.284-78.93-13.76-50.512391429203021281533122618251825151915191621131513109.31108.163
Percentage of IncomeTaxExpenseBenefit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestIncomeOperating0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Interest Expense

us-gaap:InterestExpense

us-gaap:InterestExpense


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value27262830302629242424272637353938435.9068.2715.9327.3566.0067.7796.0495.243.484.7142.6562.682.253.6842.1242.144-2.436-3.348-2.2092.1532.1953.3532.2822.7972.7847.2033.0053.183.384
Percentage of InterestExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestIncomeOperating0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Net Income Loss

us-gaap:NetIncomeLoss

us-gaap:NetIncomeLoss


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value271164119165575674110320841146-19.587107-48.18-92.2813666304740653051285933533761384636583141344530322936202019
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestIncomeOperating0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:NetIncomeLoss us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings


Net
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value271164165575674110320841146-19.587
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestIncomeOperating0.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of InterestIncomeOperating us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.0

Operating Income Loss

us-gaap:OperatingIncomeLoss

us-gaap:OperatingIncomeLoss


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value274225178879912413669116481295286-8.71162-24.349-98.388531084883641015285489549815988587354794962536947514553323429
Percentage of OperatingIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestIncomeOperating0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingIncomeLoss us-gaap:ConsolidationItems

it:CorporateAndReconcilingItems


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value-552.789-551.954-588.506-584.883-555.285-552.073-629.418-567.358-571.101-573.963-544.081-532.58
Percentage of OperatingIncomeLoss-201.2-244.9-330.4-667.3-557.2-442.7-462.3-820.5-492.3-1176.2-419.8-1010.1
Percentage of InterestIncomeOperating0.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of InterestIncomeOperating it:CorporateAndReconcilingItems0.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-31
Value82777776667265467676563668762267358548498159587354
Percentage of OperatingIncomeLoss301.2344.9430.4767.3657.2542.7562.3920.5592.31276.2519.81110.1100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestIncomeOperating0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of InterestIncomeOperating us-gaap:OperatingSegments0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

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

us-gaap:OperatingSegments, it:Conferences


Operating
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-31
Value42132.044-11.23-6.06278018
Percentage of OperatingIncomeLoss15.56.22.3-11.3-4.939.769.538.7
Percentage of InterestIncomeOperating0.00.00.00.00.00.00.00.0
Percentage of InterestIncomeOperating us-gaap:OperatingSegments it:Conferences0.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, it:Consulting


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value423924283329282634282618
Percentage of OperatingIncomeLoss15.617.313.832.133.723.621.338.429.558.820.334.9
Percentage of InterestIncomeOperating0.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of InterestIncomeOperating us-gaap:OperatingSegments it:Consulting0.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, it:ResearchSegment


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value742724669642632653621582572575544534
Percentage of OperatingIncomeLoss270.1321.4375.8732.8634.8524.0456.7842.4493.41178.6420.41014.5
Percentage of InterestIncomeOperating0.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of InterestIncomeOperating us-gaap:OperatingSegments it:ResearchSegment0.00.00.00.00.00.00.00.00.00.00.00.0

Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-06-302018-03-31
Value5.4575.276.5134.3792.9-44.73211-11.379-24.715-14.5053.09310
Percentage of OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestIncomeOperating0.00.00.00.00.00.00.00.00.00.00.00.0

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

us-gaap:OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax

us-gaap:OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-31
Value4.6390.677257.49823-46.381-4.9093.55312-7.2367.2590.964-60.01520-4.351461.0244.371-8.357-3.0323.3352.068-1.306-7.96.224-20.107-15.471-12.5880.876-0.2784.109-1.22-3.7895.383-4.3392.676
Percentage of OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestIncomeOperating0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Other Comprehensive Income Loss Net Of Tax

us-gaap:OtherComprehensiveIncomeLossNetOfTax

us-gaap:OtherComprehensiveIncomeLossNetOfTax


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-30
Value106.05301126-91.0343.326-7.785-11.913-21.699-17.7741.367-56.276302.72447-1.0571.851-1.8990.2191.427-5.0284.872-13.6576.711-21.158-19.169-11.9541.4010.2071.6114.376-0.405-3.205-2.7055.05-4.8242.654-0.015-8.555-1.925
Percentage of OtherComprehensiveIncomeLossNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestIncomeOperating0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OtherComprehensiveIncomeLossNetOfTax us-gaap:StatementEquityComponents

us-gaap:AccumulatedDefinedBenefitPlansAdjustment


Other
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-30
Value0.1040.1030.0850.080.0790.0410.0410.0420.0530.0550.0560.0520.0490.048-1.0770.0370.0380.0371.0370.0530.0530.053-4.2610.0150.0140.015-0.2630.0060.001
Percentage of OtherComprehensiveIncomeLossNetOfTax1.01.70.70.3-0.1-0.5-0.3-0.23.9-0.10.20.1-4.62.656.716.92.7-0.721.3-0.40.8-0.322.2-0.11.07.2-16.30.1-0.2
Percentage of InterestIncomeOperating0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of InterestIncomeOperating us-gaap:AccumulatedDefinedBenefitPlansAdjustment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedGainLossNetCashFlowHedgeParent


Other
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-30
Value5.4575.274.3792.9-44.732-11.379-24.715-14.5050.353.684101.302-2.13
Percentage of OtherComprehensiveIncomeLossNetOfTax53.587.136.610.849.1146.2207.566.825.6-6.532.92.7201.5
Percentage of InterestIncomeOperating0.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of InterestIncomeOperating us-gaap:AccumulatedGainLossNetCashFlowHedgeParent0.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedOtherComprehensiveIncome


Other
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value106.051126-91.034-7.785-11.913-21.6991.367-56.2763047-1.0571.851-1.8990.2191.427-5.0284.872-13.6576.711-21.158
Percentage of OtherComprehensiveIncomeLossNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestIncomeOperating0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of InterestIncomeOperating us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedTranslationAdjustment


Other
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-30
Value4.6390.6777.49823-46.3813.55312-7.2360.964-60.01520461.0244.371-8.357-3.0323.3352.068-1.306-7.96.224-20.107-15.471-12.5880.876-0.2781.4034.109-1.22
Percentage of OtherComprehensiveIncomeLossNetOfTax45.511.262.788.950.9-45.6-107.133.370.5106.666.997.2-96.9236.1440.1-1384.5233.7-41.1-26.857.892.795.080.7105.362.5-134.387.193.9301.2
Percentage of InterestIncomeOperating0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of InterestIncomeOperating us-gaap:AccumulatedTranslationAdjustment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Other Nonoperating Income Expense

us-gaap:OtherNonoperatingIncomeExpense

us-gaap:OtherNonoperatingIncomeExpense


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-3.682154.3921.869-10.399-1.5150.5798.024-0.247-0.824-1.026-0.8271.120.8991.7951.171-0.4070.8893.321.9541.2481.8841.0595.367-0.468-0.962-0.251-0.2870.175-0.229-0.1520.005-0.280.2110.55-0.748-0.076-0.978-0.417-0.541-0.571-0.382-0.3-0.373-0.6431.752
Percentage of OtherNonoperatingIncomeExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestIncomeOperating0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Revenue From Contract With Customer Excluding Assessed Tax

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value1167110411129949731018120310001070970108892110019631014828843625703574609557643500547471583470519446520410446406474374397369427345365329382296314295
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestIncomeOperating0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ProductOrService

it:Conferences


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value582493120.317132176614151
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax5.02.28.41.30.01.418.16.613.25.4
Percentage of InterestIncomeOperating0.00.00.00.00.00.00.00.00.00.0
Percentage of InterestIncomeOperating it:Conferences0.00.00.00.00.00.00.00.00.00.0

it:Consulting


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value1059993899795103931039395789682857291
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax9.19.08.49.010.09.48.69.39.79.68.88.59.68.68.48.710.9
Percentage of InterestIncomeOperating0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of InterestIncomeOperating it:Consulting0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

it:ResearchRevenue


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value1003979925892875909882840826825797774770763692653613
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax85.988.783.289.889.989.273.384.177.185.173.284.076.979.368.378.972.7
Percentage of InterestIncomeOperating0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of InterestIncomeOperating it:ResearchRevenue0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:StatementBusinessSegments

it:Conferences


Revenue
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-31
Value5824120.317136614151
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax5.02.21.30.01.46.613.25.4
Percentage of InterestIncomeOperating0.00.00.00.00.00.00.00.0
Percentage of InterestIncomeOperating it:Conferences0.00.00.00.00.00.00.00.0

it:Consulting


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
Value105999389979510393103939578968285729178
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax9.19.08.49.010.09.48.69.39.79.68.88.59.68.68.48.710.912.6
Percentage of InterestIncomeOperating0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of InterestIncomeOperating it:Consulting0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

it:ResearchSegment


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
Value1003979925892875909882840826825797774770763692653613511
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax85.988.783.289.889.989.273.384.177.185.173.284.076.979.368.378.972.781.8
Percentage of InterestIncomeOperating0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of InterestIncomeOperating it:ResearchSegment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

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

it:Conferences, us-gaap:TransferredAtPointInTime


Revenue
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-31
Value5824120.317136614151
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax5.02.21.30.01.46.613.25.4
Percentage of InterestIncomeOperating0.00.00.00.00.00.00.00.0
Percentage of InterestIncomeOperating it:Conferences us-gaap:TransferredAtPointInTime0.00.00.00.00.00.00.00.0

it:Consulting, us-gaap:TransferredAtPointInTime


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value19152115281423152414228.997198.886137.5522313
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.71.41.91.53.01.42.01.62.31.52.01.01.90.91.30.92.82.2
Percentage of InterestIncomeOperating0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of InterestIncomeOperating it:Consulting us-gaap:TransferredAtPointInTime0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

it:Consulting, us-gaap:TransferredOverTime


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value858472736881807779787369777471646864
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax7.47.66.57.47.18.06.77.87.48.16.87.67.77.77.17.88.110.4
Percentage of InterestIncomeOperating0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of InterestIncomeOperating it:Consulting us-gaap:TransferredOverTime0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

it:ResearchSegment, us-gaap:TransferredAtPointInTime


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value868575696480747171726564616254534344
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax7.47.86.86.96.77.96.27.16.77.56.07.06.16.55.46.45.27.1
Percentage of InterestIncomeOperating0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of InterestIncomeOperating it:ResearchSegment us-gaap:TransferredAtPointInTime0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

it:ResearchSegment, us-gaap:TransferredOverTime


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value916894849823810829807769754752731709708701638600570466
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax78.581.076.482.883.381.467.176.970.477.667.277.070.872.862.972.567.674.7
Percentage of InterestIncomeOperating0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of InterestIncomeOperating it:ResearchSegment us-gaap:TransferredOverTime0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:StatementGeographical

it:EuropeMiddleEastAfrica


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
Value286263265235226238254247253241264234242259247242212153
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax24.623.823.923.723.323.421.124.723.724.824.325.424.226.924.429.325.224.6
Percentage of InterestIncomeOperating0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of InterestIncomeOperating it:EuropeMiddleEastAfrica0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

it:OtherInternational


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
Value134132131118114130141128126118132107108110101929178
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax11.512.011.811.911.812.811.712.811.812.212.211.710.911.510.011.210.812.6
Percentage of InterestIncomeOperating0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of InterestIncomeOperating it:OtherInternational0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

it:UnitedStatesAndCanada


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
Value746708715640631650807624690611691579650593665493540392
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax63.964.264.364.464.963.867.162.564.563.063.562.964.961.665.659.664.062.9
Percentage of InterestIncomeOperating0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of InterestIncomeOperating it:UnitedStatesAndCanada0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

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

it:EuropeMiddleEastAfrica, it:Conferences


Revenue
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-31
Value142.7132.0640.02.147242517
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.20.20.20.00.22.42.41.8
Percentage of InterestIncomeOperating0.00.00.00.00.00.00.00.0
Percentage of InterestIncomeOperating it:EuropeMiddleEastAfrica it:Conferences0.00.00.00.00.00.00.00.0

it:EuropeMiddleEastAfrica, it:Consulting


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value3530272330303126332929263329292929
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax3.02.82.52.43.13.02.62.63.23.12.72.83.43.12.93.53.5
Percentage of InterestIncomeOperating0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of InterestIncomeOperating it:EuropeMiddleEastAfrica it:Consulting0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

it:EuropeMiddleEastAfrica, it:ResearchSegment


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value236230213210196205167196193193186180186184152176152
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax20.320.919.221.120.220.213.919.618.120.017.119.518.619.215.121.318.1
Percentage of InterestIncomeOperating0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of InterestIncomeOperating it:EuropeMiddleEastAfrica it:ResearchSegment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

it:OtherInternational, it:Conferences


Revenue
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-31
Value3.3832.490.0050.05.74313145.728
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.30.20.00.00.61.41.40.6
Percentage of InterestIncomeOperating0.00.00.00.00.00.00.00.0
Percentage of InterestIncomeOperating it:OtherInternational it:Conferences0.00.00.00.00.00.00.00.0

it:OtherInternational, it:Consulting


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value101110109.358117.6828.1358.2068.1117.0286.5947.0847.8297.2636.577.075
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.91.10.91.01.01.10.60.80.80.80.60.70.70.80.70.80.8
Percentage of InterestIncomeOperating0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of InterestIncomeOperating it:OtherInternational it:Consulting0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

it:OtherInternational, it:ResearchSegment


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value120118109108105113109106103104102919089667068
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax10.310.79.910.910.811.19.110.79.710.79.49.99.09.36.58.58.1
Percentage of InterestIncomeOperating0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of InterestIncomeOperating it:OtherInternational it:ResearchSegment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

it:UnitedStatesAndCanada, it:Conferences


Revenue
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-31
Value4019100.3175.982810029
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax3.51.81.10.00.62.89.43.0
Percentage of InterestIncomeOperating0.00.00.00.00.00.00.00.0
Percentage of InterestIncomeOperating it:UnitedStatesAndCanada it:Conferences0.00.00.00.00.00.00.00.0

it:UnitedStatesAndCanada, it:Consulting


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value5957555558546458615559455545483654
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax5.15.25.05.66.05.35.45.95.75.75.45.05.64.74.84.46.5
Percentage of InterestIncomeOperating0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of InterestIncomeOperating it:UnitedStatesAndCanada it:Consulting0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

it:UnitedStatesAndCanada, it:ResearchSegment


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value646631601574573590605538528527508502493489473406392
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax55.457.254.157.758.957.950.353.849.354.346.754.549.350.846.749.146.6
Percentage of InterestIncomeOperating0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of InterestIncomeOperating it:UnitedStatesAndCanada it:ResearchSegment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:TimingOfTransferOfGoodOrService

us-gaap:TransferredAtPointInTime


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value164125190969310831515323713828313319612924511616993
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax14.111.417.19.79.710.626.315.322.214.326.014.519.613.424.214.020.115.0
Percentage of InterestIncomeOperating0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of InterestIncomeOperating us-gaap:TransferredAtPointInTime0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:TransferredOverTime


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value1002978922897879910887847833831805788804834769711673531
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax85.988.682.990.390.389.473.784.777.885.774.085.580.486.675.886.079.985.0
Percentage of InterestIncomeOperating0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of InterestIncomeOperating us-gaap:TransferredOverTime0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Revenues

us-gaap:Revenues

us-gaap:Revenues


Revenues
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value1167110411129949731018120310001070970108892110019631014828843625703574609557643500547471583470519446520410446406474374397369427345365329382296314295
Percentage of Revenues100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestIncomeOperating0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:Revenues us-gaap:ConsolidationItems

us-gaap:OperatingSegments


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-30
Value1167110411129949731018120310001070970108892110019631014828843625703574609557643500547471583470519
Percentage of Revenues100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestIncomeOperating0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of InterestIncomeOperating us-gaap:OperatingSegments0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

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

us-gaap:OperatingSegments, it:Conferences


Revenuesus-gaap:
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-31
Value5824120.317136614151
Percentage of Revenues5.02.21.30.01.46.613.25.4
Percentage of InterestIncomeOperating0.00.00.00.00.00.00.00.0
Percentage of InterestIncomeOperating us-gaap:OperatingSegments it:Conferences0.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, it:Consulting


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-30
Value1059993899795103931039395789682857291858879948487748876888293
Percentage of Revenues9.19.08.49.010.09.48.69.39.79.68.88.59.68.68.48.710.913.612.513.815.415.213.714.916.116.315.117.518.0
Percentage of InterestIncomeOperating0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of InterestIncomeOperating us-gaap:OperatingSegments it:Consulting0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, it:ResearchSegment


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-30
Value1003979925892875909882840826825797774770763692653613504478461449440420396385381373365358
Percentage of Revenues85.988.783.289.889.989.273.384.177.185.173.284.076.979.368.378.972.780.768.180.473.679.065.379.270.480.963.977.669.0
Percentage of InterestIncomeOperating0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of InterestIncomeOperating us-gaap:OperatingSegments it:ResearchSegment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Selling General And Administrative Expense

us-gaap:SellingGeneralAndAdministrativeExpense

us-gaap:SellingGeneralAndAdministrativeExpense


Selling
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value488487525521494496557512514518488447460487465421408304289269272257258236237229235217218204212181185180186164165162170148152141154127130130
Percentage of SellingGeneralAndAdministrativeExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestIncomeOperating0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:SellingGeneralAndAdministrativeExpense us-gaap:ConsolidationItems

it:CorporateAndReconcilingItems


Selling
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-30
Value488487525521494496557512514518488447460487465421408304289269272257258236237
Percentage of SellingGeneralAndAdministrativeExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestIncomeOperating0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of InterestIncomeOperating it:CorporateAndReconcilingItems0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Assets

us-gaap:Assets

us-gaap:Assets


Assets
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value71886937731568406810680071516737672967146201594461526915728370116994336523672277230422112174209118611789190417681796175717831628161315671621147913801349137913041295127512851215
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Liabilities

us-gaap:Liabilities

us-gaap:Liabilities


Liabilities
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value66606046622558035819591062125817576558575350500352315927629961486141326223062288235723242307225120311928174316161599152014221306128512481314121711651178119811101080106510981102
Percentage of Liabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets92.787.185.184.885.486.986.986.385.787.286.384.285.085.786.587.787.896.997.4100.5102.3105.1106.1107.6109.1107.891.591.489.086.579.780.279.679.681.182.384.487.386.885.183.383.585.590.7

Liabilities And Stockholders Equity

us-gaap:LiabilitiesAndStockholdersEquity

us-gaap:LiabilitiesAndStockholdersEquity


Liabilities
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value71886937731568406810680071516737672967146201594461526915728370116994336523672277230422112174209118611789190417681796175717831628161315671621147913801349137913041295127512851215
Percentage of LiabilitiesAndStockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Stockholders Equity

us-gaap:StockholdersEquity

us-gaap:StockholdersEquity


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-312008-12-312007-12-31
Value5278911090103799189093891996385685094192198798386385310260-10.498-52.828-112.67-132.4-159.589-170.155-139.513161152197236361321328319306261214171181194215210187112-21.31617
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets7.312.914.915.214.613.113.113.714.312.813.715.815.014.313.512.312.23.12.6-0.5-2.3-5.1-6.1-7.6-9.1-7.88.58.611.013.520.319.820.420.418.917.715.612.713.214.916.716.514.59.30.00.0

us-gaap:StockholdersEquity us-gaap:StatementEquityComponents

us-gaap:AccumulatedDefinedBenefitPlansAdjustment


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-31
Value-9.102-9.206-9.309-8.34-8.425-8.505-8.584-5.614-5.655-5.696-5.738-5.697-5.75-5.805-5.861-5.648-5.7-5.749-5.797-4.72-4.757-4.795-4.832-5.869-5.922-5.975-6.028
Percentage of StockholdersEquity-1.7-1.0-0.9-0.8-0.8-1.0-0.9-0.6-0.6-0.7-0.7-0.6-0.6-0.6-0.6-0.7-0.7-5.6-9.545.09.04.33.63.73.54.3-3.7
Percentage of Assets-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.2-0.2-0.2-0.2-0.2-0.2-0.3-0.3-0.3-0.3
Percentage of Assets us-gaap:AccumulatedDefinedBenefitPlansAdjustment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedGainLossNetCashFlowHedgeParent


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-31
Value-67.377-72.834-78.104-84.617-88.996-91.896-47.164-58.369-46.99-22.275-7.771616122.483-4.805-6.107-3.977-1.409
Percentage of StockholdersEquity-12.8-8.2-7.2-8.2-9.0-10.3-5.0-6.3-4.9-2.6-0.91.81.81.30.3-0.6-0.7-3.9-2.3
Percentage of Assets-0.9-1.0-1.1-1.2-1.3-1.4-0.7-0.9-0.7-0.3-0.10.30.30.20.0-0.1-0.1-0.1-0.1
Percentage of Assets us-gaap:AccumulatedGainLossNetCashFlowHedgeParent0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedges


Stockholders
Period End2020-12-312019-12-312018-12-312018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-31
Value-78.104-47.164-7.77122.483-4.805-6.107-3.977-1.409-8.944-12.158-10.212-3.079-8.22-2.41-2.844-1.74
Percentage of StockholdersEquity-7.2-5.0-0.91.30.3-0.6-0.7-3.9-2.385.223.09.12.35.21.42.0-1.1
Percentage of Assets-1.1-0.7-0.10.20.0-0.1-0.1-0.1-0.1-0.4-0.5-0.5-0.1-0.4-0.1-0.2-0.1
Percentage of Assets us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedges0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedOtherComprehensiveIncome


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-312008-12-312007-12-31
Value-82.978-93.178-99.228-130.213-142.175-168.972-77.938-81.264-73.479-61.566-39.867-22.684-24.051321.508-1.216-48.889-47.832-49.683-47.784-48.003-49.43-44.402-49.274-35.617-42.328-21.178.3455.9685.7931411-1.74123
Percentage of StockholdersEquity-15.7-10.5-9.1-12.6-14.3-19.0-8.3-8.8-7.6-7.2-4.7-2.4-2.63.30.2-0.1-5.7-46.5-81.6455.290.943.933.530.920.930.3-13.12.31.93.27.810.18.2135.1
Percentage of Assets-1.2-1.3-1.4-1.9-2.1-2.5-1.1-1.2-1.1-0.9-0.6-0.4-0.40.50.0-0.0-0.7-1.4-2.1-2.1-2.1-2.2-2.0-2.4-1.9-2.4-1.10.50.40.41.10.90.00.0
Percentage of Assets us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedTranslationAdjustment


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-31
Value-6.499-11.138-11.815-37.256-44.754-68.571-22.19-17.281-20.834-33.595-26.359-33.618-34.582254.8869.237-37.082-38.106-42.477-34.12-31.088-34.423-36.491-35.185-27.285-33.509-13.402
Percentage of StockholdersEquity-1.2-1.2-1.1-3.6-4.5-7.7-2.4-1.9-2.2-3.9-3.1-3.6-3.82.60.51.1-4.3-37.1-69.8325.058.830.627.622.016.024.0-8.3
Percentage of Assets-0.1-0.2-0.2-0.5-0.7-1.0-0.3-0.3-0.3-0.5-0.4-0.6-0.60.40.10.1-0.5-1.1-1.8-1.5-1.3-1.6-1.7-1.7-1.5-1.9-0.7
Percentage of Assets us-gaap:AccumulatedTranslationAdjustment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AdditionalPaidInCapital


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-312008-12-312007-12-31
Value203120031968196019411922189918851868185218231810179817881761863818764718679646611590570545
Percentage of StockholdersEquity385.1224.7180.6188.9195.9216.0202.4205.0193.9216.2214.4192.3195.1181.1179.11417.8-618.2474.3198.9221.7355.8327.1525.0-2677.23116.2
Percentage of Assets28.328.926.928.728.528.326.628.027.827.629.430.529.225.924.236.537.640.140.341.946.947.648.60.00.0
Percentage of Assets us-gaap:AdditionalPaidInCapital0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:CommonStock


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-312008-12-312007-12-31
Value0.0820.0820.0820.0820.0820.0820.0820.0820.0820.0820.0820.0820.0820.0820.0820.0780.0780.0780.0780.0780.0780.0780.0780.0780.078
Percentage of StockholdersEquity0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.1-0.10.00.00.00.00.00.1-0.40.4
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets us-gaap:CommonStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:RetainedEarnings


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-312008-12-312007-12-31
Value2690241922552135211820631988192118791776175516711659161316471644145012751091908742605509426322
Percentage of StockholdersEquity510.0271.4206.8205.9213.8231.8211.9208.9195.0207.3206.3177.5180.1163.4167.52700.5-1095.7791.1302.0296.2408.5323.8452.7-2000.51843.4
Percentage of Assets37.434.930.831.231.130.327.828.527.926.528.328.127.023.322.669.466.767.061.256.053.847.141.90.00.0
Percentage of Assets us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:TreasuryStock


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-312008-12-312007-12-31
Value-4111.995-3438.35-3034.823-2928.369-2927.093-2927.262-2871.546-2805.552-2711.312-2710.464-2688.6-2517.807-2512.332-2446.761-2426.792-2396.649-2357.306-1857.219-1457.034-1287.726-1213.481-1045.119-999.121-1016.748-874.046
Percentage of StockholdersEquity-779.3-385.6-278.3-282.3-295.3-328.8-305.9-305.1-281.3-316.3-316.0-267.4-272.7-247.8-246.8-3936.81780.4-1152.3-403.3-419.9-667.5-558.7-887.84769.9-4995.1
Percentage of Assets-57.2-49.6-41.5-42.8-43.0-43.0-40.2-41.6-40.3-40.4-43.4-42.4-40.8-35.4-33.3-101.2-108.4-97.5-81.7-79.4-87.9-81.3-82.20.00.0
Percentage of Assets us-gaap:TreasuryStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Assets Current

us-gaap:AssetsCurrent

us-gaap:AssetsCurrent


Assets
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value2257199723231865176717722018170616911716181115351608231025881812175921751343124512331179114010611066100010969599719451084935923875927781686676705633625616621557
Percentage of AssetsCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets31.428.831.827.325.926.128.225.325.125.629.225.826.133.435.525.825.264.756.754.753.553.352.550.757.355.957.654.254.153.860.857.457.255.857.252.949.750.151.148.648.348.348.345.9

Cash And Cash Equivalents At Carrying Value

us-gaap:CashAndCashEquivalentsAtCarryingValue

us-gaap:CashAndCashEquivalentsAtCarryingValue


Cash
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-312007-12-31
Value7964457125533562272803062181491562101411895386305891227474465445403372371357281365341317283423374333269299255150138142156125109120148122105116140109
Percentage of CashAndCashEquivalentsAtCarryingValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets11.16.49.78.15.23.43.94.63.22.22.53.52.32.77.49.08.436.520.020.419.318.317.217.719.215.719.219.317.716.123.823.020.717.218.517.310.910.310.312.09.78.59.30.00.00.09.60.00.0

Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents


Cash
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-31
Value8004457125533562272803062181491582131592275676486321271499412
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets11.16.49.78.15.23.43.94.63.22.22.63.62.63.37.89.29.037.821.119.0

Accounts Receivable Net Current

us-gaap:AccountsReceivableNetCurrent

us-gaap:AccountsReceivableNetCurrent


Accounts
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value1102117512419481048114813261028111211781255979108311341176874886716643560613602580482527526552449493496490392432441463370389384421349360345364317
Percentage of AccountsReceivableNetCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets15.316.917.013.915.416.918.515.316.517.620.216.517.616.416.212.512.721.327.224.626.627.326.723.128.429.429.025.427.428.327.524.126.828.228.625.128.228.530.526.827.827.128.426.1

Prepaid Expense And Other Assets Current

us-gaap:PrepaidExpenseAndOtherAssetsCurrent

us-gaap:PrepaidExpenseAndOtherAssetsCurrent


Prepaid
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-31
Value109118109154128156146173148156165178199175124164141918410763546211482886387716763918081758978786366739264
Percentage of PrepaidExpenseAndOtherAssetsCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.51.71.52.31.92.32.02.62.22.32.73.03.22.51.72.42.02.73.64.72.82.52.95.54.44.93.44.94.03.93.65.65.05.24.76.15.75.84.65.15.77.25.0

Noncurrent Assets

us-gaap:NoncurrentAssets

us-gaap:NoncurrentAssets


Noncurrent
Period End2020-12-312019-12-312018-12-312017-12-31
Value12401269424415
Percentage of NoncurrentAssets100.0100.0100.0100.0
Percentage of Assets17.017.86.85.7

us-gaap:NoncurrentAssets us-gaap:StatementGeographical

it:OtherInternational


Noncurrent
Period End2020-12-312019-12-312018-12-312017-12-31
Value1531595041
Percentage of NoncurrentAssets12.412.512.010.0
Percentage of Assets2.12.20.80.6
Percentage of Assets it:OtherInternational0.00.00.00.0

it:UnitedStatesAndCanada


Noncurrent
Period End2020-12-312019-12-312018-12-312017-12-31
Value820867305288
Percentage of NoncurrentAssets66.268.472.169.5
Percentage of Assets11.212.14.94.0
Percentage of Assets it:UnitedStatesAndCanada0.00.00.00.0

us-gaap:EMEA


Noncurrent
Period End2020-12-312019-12-312018-12-312017-12-31
Value2652426784
Percentage of NoncurrentAssets21.419.115.920.4
Percentage of Assets3.63.41.11.2
Percentage of Assets us-gaap:EMEA0.00.00.00.0

Property Plant And Equipment Gross

us-gaap:PropertyPlantAndEquipmentGross

us-gaap:PropertyPlantAndEquipmentGross


Property
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value676635514432306274259240229229202
Percentage of PropertyPlantAndEquipmentGross100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets9.28.98.35.912.912.613.613.514.216.615.8

us-gaap:PropertyPlantAndEquipmentGross us-gaap:PropertyPlantAndEquipmentByType

it:EquipmentAndFurniture


Property
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value1141048567433937342934
Percentage of PropertyPlantAndEquipmentGross16.916.416.515.614.114.214.314.113.015.2
Percentage of Assets1.61.51.40.91.81.82.01.91.82.5
Percentage of Assets it:EquipmentAndFurniture0.00.00.00.00.00.00.00.00.00.0

us-gaap:ComputerSoftwareIntangibleAsset


Property
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-31
Value277256210189166148144136
Percentage of PropertyPlantAndEquipmentGross41.140.341.043.854.454.055.656.7
Percentage of Assets3.83.63.42.67.06.87.67.7
Percentage of Assets us-gaap:ComputerSoftwareIntangibleAsset0.00.00.00.00.00.00.00.0

us-gaap:LeaseholdImprovements


Property
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value283275218175968778706463
Percentage of PropertyPlantAndEquipmentGross42.043.342.540.731.631.730.129.228.027.8
Percentage of Assets3.93.83.52.44.14.04.13.94.04.6
Percentage of Assets us-gaap:LeaseholdImprovements0.00.00.00.00.00.00.00.00.00.0

Accumulated Depreciation Depletion And Amortization Property Plant And Equipment

us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment

us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment


Accumulated
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value339291246210184165161149-140.331161154
Percentage of AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets4.64.14.02.97.87.68.58.4-8.711.712.1

Amortization Of Intangible Assets

us-gaap:AmortizationOfIntangibleAssets

us-gaap:AmortizationOfIntangibleAssets


Amortization
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value26303031313232313233345050515351656.296.1836.2216.216.1836.3592.7372.1072.1392.4632.5051.9791.2791.3571.3511.4041.3341.3731.3620.9280.7390.7370.7392.5222.5272.5312.5312.5372.926
Percentage of AmortizationOfIntangibleAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Property Plant And Equipment Net

us-gaap:PropertyPlantAndEquipmentNet

us-gaap:PropertyPlantAndEquipmentNet


Property
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value309322336332343346344300291271267246225223221216197126121118117108108109107104979395949190898889807769685752454752
Percentage of PropertyPlantAndEquipmentNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets4.34.64.64.95.05.14.84.54.34.04.34.13.73.23.03.12.83.85.15.25.14.95.05.25.85.85.15.35.35.45.15.55.55.65.55.45.65.24.94.44.13.63.74.3

Goodwill

us-gaap:Goodwill

us-gaap:Goodwill


Goodwill
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-04-052017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value295529432945293829352927293729392930290629232910297429562987314531692427855738742742718715723583579586593598589519518516516519519515510508510516514510513
Percentage of Goodwill100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets41.142.440.343.043.143.141.143.643.543.347.149.048.342.841.044.945.30.025.431.232.632.232.532.934.631.332.430.833.533.333.629.131.832.033.032.035.137.337.936.939.139.840.439.742.3

us-gaap:Goodwill us-gaap:StatementBusinessSegments

it:Conferences


Goodwillus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312018-12-312017-12-312016-12-31
Value18418418418918918818918718746
Percentage of Goodwill6.26.36.26.56.56.46.56.46.36.3
Percentage of Assets2.62.72.52.82.82.82.73.02.62.0
Percentage of Assets it:Conferences0.00.00.00.00.00.00.00.00.00.0

it:Consulting


Goodwillus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312011-12-312010-12-31
Value96969696969697969797979797989797969696979897989899989910010110010010099991009999
Percentage of Goodwill3.33.33.33.33.33.33.33.33.33.33.33.33.33.33.33.13.111.313.113.113.313.613.813.717.017.016.916.916.917.119.419.319.319.319.319.619.6
Percentage of Assets1.31.41.31.41.41.41.41.41.41.41.61.61.61.41.31.41.42.94.14.34.34.44.54.75.35.55.25.75.65.75.66.26.26.36.27.27.8
Percentage of Assets it:Consulting0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

it:ResearchSegment


Goodwillus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302011-12-312010-12-31
Value26742662266426522649264226512655264526222638262526202601261923362482712595598602578575583441439445451455447376376374375377376366368
Percentage of Goodwill90.590.590.590.390.390.390.290.390.390.290.390.288.188.087.774.378.383.280.680.681.180.580.480.675.875.875.976.076.175.872.572.672.572.672.672.672.272.2
Percentage of Assets37.238.436.438.838.938.937.139.439.339.042.544.242.637.636.033.335.521.225.226.326.126.226.527.923.724.623.425.525.425.421.123.123.223.923.325.526.628.7
Percentage of Assets it:ResearchSegment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Intangible Assets Net Excluding Goodwill

us-gaap:IntangibleAssetsNetExcludingGoodwill

us-gaap:IntangibleAssetsNetExcludingGoodwill


Intangible
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value77577780682084786492593697310161042108511771247129215641595817681999096962728303336346.1077.5358.834101113146.3217.067.7988.537111324
Percentage of IntangibleAssetsNetExcludingGoodwill100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets10.811.211.012.012.412.712.913.914.515.116.818.319.118.017.722.322.82.43.23.64.34.14.44.61.51.61.61.92.02.00.30.50.50.70.70.91.00.50.50.60.70.91.12.0

Finite Lived Intangible Assets Net

us-gaap:FiniteLivedIntangibleAssetsNet

us-gaap:FiniteLivedIntangibleAssetsNet


Finite
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-31
Value77577780682084786492593697310161042108511771247129215641595817681999096962728303336346.1077.5358.834101113146.3217.067.7988.5377.0613
Percentage of FiniteLivedIntangibleAssetsNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets10.811.211.012.012.412.712.913.914.515.116.818.319.118.017.722.322.82.43.23.64.34.14.44.61.51.61.61.92.02.00.30.50.50.70.70.91.00.50.50.60.70.61.1

us-gaap:FiniteLivedIntangibleAssetsNet us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:ComputerSoftwareIntangibleAsset


Finite
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-30
Value3021273238434954606671778491971731736.8017.1218.5221011126.4613.5823.4243.9664.755.5771.6231.0191.1931.3651.5741.7171.867
Percentage of FiniteLivedIntangibleAssetsNet4.02.83.44.04.55.05.35.96.26.56.97.27.17.37.511.110.98.49.310.410.712.413.06.713.212.012.914.215.34.716.715.815.515.014.514.2
Percentage of Assets0.40.30.40.50.60.60.70.80.91.01.21.31.41.31.32.52.50.20.30.40.50.50.60.30.20.20.20.30.30.10.10.10.10.10.10.1
Percentage of Assets us-gaap:ComputerSoftwareIntangibleAsset0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:CustomerRelationships


Finite
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-31
Value73774977278079980986186689592994697910441089110712511267534648565153561515161718181.7742.53.1024.0164.6665.3495.8993.1543.6054.0554.5063.6055.433
Percentage of FiniteLivedIntangibleAssetsNet95.196.495.795.194.493.793.292.692.091.590.890.288.787.385.780.079.565.460.759.556.856.855.858.556.056.254.953.151.353.729.033.235.138.339.540.742.049.951.152.052.851.140.0
Percentage of Assets10.310.810.611.411.711.912.112.913.313.815.316.517.015.815.217.818.11.62.02.12.42.32.52.70.80.90.91.01.01.10.10.20.20.30.30.40.40.20.30.30.30.30.4
Percentage of Assets us-gaap:CustomerRelationships0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:MediaContent


Finite
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-30
Value0.370.7881.2071.6632.9152.9674.0195.0716.1257.8142440561121241.2441.6951.3385.3151.4321.925130.821.0481.3141.5791.9221.8892.1082.3152.522.722.953.123.201
Percentage of FiniteLivedIntangibleAssetsNet0.00.10.10.20.30.30.40.50.60.72.13.24.47.27.81.52.21.65.41.62.013.63.03.74.34.75.35.534.530.728.526.025.023.722.8
Percentage of Assets0.00.00.00.00.00.00.10.10.10.10.40.60.81.61.80.00.10.10.20.10.10.60.00.10.10.10.10.10.10.10.20.20.20.20.2
Percentage of Assets us-gaap:MediaContent0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OtherIntangibleAssets


Finite
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302016-12-31
Value6.6446.646.9177.1928.3749.6221011131417212426302721
Percentage of FiniteLivedIntangibleAssetsNet0.90.90.90.91.01.11.21.31.41.51.71.92.12.22.41.727.8
Percentage of Assets0.10.10.10.10.10.10.20.20.20.20.30.40.40.40.40.40.9
Percentage of Assets us-gaap:OtherIntangibleAssets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Operating Lease Right Of Use Asset

us-gaap:OperatingLeaseRightOfUseAsset

us-gaap:OperatingLeaseRightOfUseAsset


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312019-01-01
Value618633647651668678702652637634651
Percentage of OperatingLeaseRightOfUseAsset100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets8.69.18.89.59.810.09.89.79.59.40.0

Other Assets Noncurrent

us-gaap:OtherAssetsNoncurrent

us-gaap:OtherAssetsNoncurrent


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value27226225623024821122220120517015616616617619327327212687881111151131007775928994938176767673848686909592879367
Percentage of OtherAssetsNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets3.83.83.53.43.63.13.13.03.12.52.52.82.72.62.73.93.93.83.73.94.85.25.24.84.24.24.85.15.25.34.64.74.74.94.55.76.36.46.57.37.26.97.25.5

Accounts Payable And Accrued Liabilities Current

us-gaap:AccountsPayableAndAccruedLiabilitiesCurrent

us-gaap:AccountsPayableAndAccruedLiabilitiesCurrent


Accounts
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value752703952790736533788593564526710599542532666550517331440348287247387290262240353266251211325224204180287206178160259183172143247255
Percentage of AccountsPayableAndAccruedLiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets10.510.113.011.610.87.911.08.88.47.811.510.18.87.79.27.87.49.918.615.312.511.217.813.914.113.418.615.114.012.018.213.812.711.517.713.912.911.918.814.113.311.319.321.1

Accounts Payable Current

us-gaap:AccountsPayableCurrent

us-gaap:AccountsPayableCurrent


Accounts
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value3832374941311617272717
Percentage of AccountsPayableCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.50.50.60.71.71.50.91.01.72.01.4

Contract With Customer Liability Current

us-gaap:ContractWithCustomerLiabilityCurrent

us-gaap:ContractWithCustomerLiabilityCurrent


Contract
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value215220881974171017651847192818031796183717451650168717191630
Percentage of ContractWithCustomerLiabilityCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets29.930.127.025.025.927.227.026.826.727.428.127.827.424.922.4

Liabilities Current

us-gaap:LiabilitiesCurrent

us-gaap:LiabilitiesCurrent


Liabilities
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value2909281229472521253925302856252724822568262023432513318528222482224314701460141713871291132312351204142012151358134512661159104310149751070968908911921834799784811898
Percentage of LiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets40.540.540.336.937.337.239.937.536.938.342.339.440.946.138.835.432.143.761.762.260.258.460.959.164.779.463.876.874.972.165.064.162.962.266.065.565.867.566.864.061.761.563.173.9

Long Term Debt Current

us-gaap:LongTermDebtCurrent

us-gaap:LongTermDebtCurrent


Long
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value5.3222020203814913913012120416593284789379419277293040705735202028520245246222686561579080701005052558240205
Percentage of LongTermDebtCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.10.30.30.30.62.22.01.91.83.12.71.64.611.45.26.04.00.91.31.83.02.61.61.01.115.91.113.913.712.73.94.03.83.75.65.45.17.43.64.04.26.53.116.9

Operating Lease Liability Current

us-gaap:OperatingLeaseLiabilityCurrent

us-gaap:OperatingLeaseLiabilityCurrent


Operating
Period End2021-06-302021-03-312020-12-312020-09-302019-12-31
Value8685838276
Percentage of OperatingLeaseLiabilityCurrent100.0100.0100.0100.0100.0
Percentage of Assets1.21.21.11.21.1

Other Accrued Liabilities Current

us-gaap:OtherAccruedLiabilitiesCurrent

us-gaap:OtherAccruedLiabilitiesCurrent


Other
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value13514718313495514357343122
Percentage of OtherAccruedLiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.92.13.01.84.02.32.33.22.12.31.7

Taxes Payable Current

us-gaap:TaxesPayableCurrent

us-gaap:TaxesPayableCurrent


Taxes
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value297.878194620131814181515
Percentage of TaxesPayableCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.40.10.30.60.90.61.00.81.21.21.2

Long Term Debt

us-gaap:LongTermDebt us-gaap:DebtInstrument, us-gaap:LongtermDebtType

us-gaap:LongTermDebt

it:SeniorNotesDue2028, us-gaap:SeniorNotes


Long
Period End2021-06-302021-03-312020-12-312020-09-302020-06-30
Value791791790790790
Percentage of LongTermDebt100.0100.0100.0100.0100.0
Percentage of Assets11.011.410.811.611.6
Percentage of Assets it:SeniorNotesDue2028 us-gaap:SeniorNotes0.00.00.00.00.0

it:SeniorNotesDue2029, us-gaap:SeniorNotes


Long
Period End2021-06-30
Value592
Percentage of LongTermDebt74.9
Percentage of Assets8.2
Percentage of Assets it:SeniorNotesDue2029 us-gaap:SeniorNotes0.0

it:SeniorNotesDue2030, us-gaap:SeniorNotes


Long
Period End2021-06-302021-03-312020-12-312020-09-30
Value791790790790
Percentage of LongTermDebt100.0100.0100.0100.0
Percentage of Assets11.011.410.811.6
Percentage of Assets it:SeniorNotesDue2030 us-gaap:SeniorNotes0.00.00.00.0

us-gaap:LongTermDebt us-gaap:LongtermDebtType

us-gaap:SeniorNotes


Long
Period End2021-06-302021-03-312020-12-312020-03-312019-12-31
Value217515811581785785
Percentage of LongTermDebt274.9200.0200.00.00.0
Percentage of Assets30.322.821.611.611.0
Percentage of Assets us-gaap:SeniorNotes0.00.00.00.00.0

Long Term Debt Noncurrent

us-gaap:LongTermDebtNoncurrent

us-gaap:LongTermDebtNoncurrent


Long
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value245719491958195719372035204320512059209421162077214621862899292231401599664696756832790820695380385125128132136140143147115120130140150157165172180124
Percentage of LongTermDebtNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets34.228.126.828.628.429.928.630.430.631.234.134.934.931.639.841.744.947.528.130.632.837.636.339.237.321.220.27.17.27.57.68.68.99.47.18.19.410.410.912.112.713.514.010.2

Deferred Income Tax Liabilities Net

us-gaap:DeferredIncomeTaxLiabilitiesNet

us-gaap:DeferredIncomeTaxLiabilitiesNet


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value17318921420622
Percentage of DeferredIncomeTaxLiabilitiesNet100.0100.0100.0100.0100.0
Percentage of Assets2.42.73.52.81.0

us-gaap:DeferredIncomeTaxLiabilitiesNet us-gaap:BalanceSheetLocation

us-gaap:OtherLiabilities


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value17318921425322
Percentage of DeferredIncomeTaxLiabilitiesNet100.0100.0100.0123.099.9
Percentage of Assets2.42.73.53.51.0
Percentage of Assets us-gaap:OtherLiabilities0.00.00.00.00.0

Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent

us-gaap:PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent

us-gaap:PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent


Pension
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-31
Value332925262322
Percentage of PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent100.0100.0100.0100.0100.0100.0
Percentage of Assets0.50.40.40.41.01.0

Other Liabilities Noncurrent

us-gaap:OtherLiabilitiesNoncurrent

us-gaap:OtherLiabilitiesNoncurrent


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value54851953953854053047946245642461358257055557774375619218117421420019319613112814213212512112612212612512912812612712611811510810780
Percentage of OtherLiabilitiesNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets7.67.57.47.97.97.86.76.96.86.39.99.89.38.07.910.610.85.77.77.79.39.18.99.47.17.27.57.57.06.97.17.57.88.08.08.79.29.49.29.18.98.58.46.6

Operating Lease Liability Noncurrent

us-gaap:OperatingLeaseLiabilityNoncurrent

us-gaap:OperatingLeaseLiabilityNoncurrent


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-312016-12-31
Value74576578078580281383277676876916511538
Percentage of OperatingLeaseLiabilityNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets10.411.010.711.511.812.011.611.511.411.52.71.61.6

Lessee Operating Lease Liability Payments Due Year Two

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo


Lessee
Period End2020-12-31
Value133
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearTwo100.0
Percentage of Assets1.8

Lessee Operating Lease Liability Payments Due Year Three

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree


Lessee
Period End2020-12-31
Value130
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearThree100.0
Percentage of Assets1.8

Lessee Operating Lease Liability Payments Due Year Four

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour


Lessee
Period End2020-12-31
Value120
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearFour100.0
Percentage of Assets1.6

Lessee Operating Lease Liability Payments Due Year Five

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive


Lessee
Period End2020-12-31
Value115
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearFive100.0
Percentage of Assets1.6

Lessee Operating Lease Liability Payments Due After Year Five

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive


Lessee
Period End2020-12-31
Value549
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive100.0
Percentage of Assets7.5

Operating Lease Liability

us-gaap:OperatingLeaseLiability

us-gaap:OperatingLeaseLiability


Operating
Period End2021-06-302021-03-312020-12-312020-09-302019-12-312019-09-302019-06-302019-03-312019-01-01
Value831850864868909856841836851
Percentage of OperatingLeaseLiability100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets11.612.311.812.712.712.712.512.50.0

Lessee Operating Lease Liability Payments Due

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue


Lessee
Period End2020-12-31
Value1187
Percentage of LesseeOperatingLeaseLiabilityPaymentsDue100.0
Percentage of Assets16.2

Lessee Operating Lease Liability Undiscounted Excess Amount

us-gaap:LesseeOperatingLeaseLiabilityUndiscountedExcessAmount

us-gaap:LesseeOperatingLeaseLiabilityUndiscountedExcessAmount


Lessee
Period End2020-12-31
Value323
Percentage of LesseeOperatingLeaseLiabilityUndiscountedExcessAmount100.0
Percentage of Assets4.4

Stockholders Equity

us-gaap:StockholdersEquity

us-gaap:StockholdersEquity


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-312008-12-312007-12-31
Value5278911090103799189093891996385685094192198798386385310260-10.498-52.828-112.67-132.4-159.589-170.155-139.513161152197236361321328319306261214171181194215210187112-21.31617
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets7.312.914.915.214.613.113.113.714.312.813.715.815.014.313.512.312.23.12.6-0.5-2.3-5.1-6.1-7.6-9.1-7.88.58.611.013.520.319.820.420.418.917.715.612.713.214.916.716.514.59.30.00.0

us-gaap:StockholdersEquity us-gaap:StatementEquityComponents

us-gaap:AccumulatedDefinedBenefitPlansAdjustment


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-31
Value-9.102-9.206-9.309-8.34-8.425-8.505-8.584-5.614-5.655-5.696-5.738-5.697-5.75-5.805-5.861-5.648-5.7-5.749-5.797-4.72-4.757-4.795-4.832-5.869-5.922-5.975-6.028
Percentage of StockholdersEquity-1.7-1.0-0.9-0.8-0.8-1.0-0.9-0.6-0.6-0.7-0.7-0.6-0.6-0.6-0.6-0.7-0.7-5.6-9.545.09.04.33.63.73.54.3-3.7
Percentage of Assets-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.2-0.2-0.2-0.2-0.2-0.2-0.3-0.3-0.3-0.3
Percentage of Assets us-gaap:AccumulatedDefinedBenefitPlansAdjustment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedGainLossNetCashFlowHedgeParent


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-31
Value-67.377-72.834-78.104-84.617-88.996-91.896-47.164-58.369-46.99-22.275-7.771616122.483-4.805-6.107-3.977-1.409
Percentage of StockholdersEquity-12.8-8.2-7.2-8.2-9.0-10.3-5.0-6.3-4.9-2.6-0.91.81.81.30.3-0.6-0.7-3.9-2.3
Percentage of Assets-0.9-1.0-1.1-1.2-1.3-1.4-0.7-0.9-0.7-0.3-0.10.30.30.20.0-0.1-0.1-0.1-0.1
Percentage of Assets us-gaap:AccumulatedGainLossNetCashFlowHedgeParent0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedges


Stockholders
Period End2020-12-312019-12-312018-12-312018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-31
Value-78.104-47.164-7.77122.483-4.805-6.107-3.977-1.409-8.944-12.158-10.212-3.079-8.22-2.41-2.844-1.74
Percentage of StockholdersEquity-7.2-5.0-0.91.30.3-0.6-0.7-3.9-2.385.223.09.12.35.21.42.0-1.1
Percentage of Assets-1.1-0.7-0.10.20.0-0.1-0.1-0.1-0.1-0.4-0.5-0.5-0.1-0.4-0.1-0.2-0.1
Percentage of Assets us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedges0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedOtherComprehensiveIncome


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-312008-12-312007-12-31
Value-82.978-93.178-99.228-130.213-142.175-168.972-77.938-81.264-73.479-61.566-39.867-22.684-24.051321.508-1.216-48.889-47.832-49.683-47.784-48.003-49.43-44.402-49.274-35.617-42.328-21.178.3455.9685.7931411-1.74123
Percentage of StockholdersEquity-15.7-10.5-9.1-12.6-14.3-19.0-8.3-8.8-7.6-7.2-4.7-2.4-2.63.30.2-0.1-5.7-46.5-81.6455.290.943.933.530.920.930.3-13.12.31.93.27.810.18.2135.1
Percentage of Assets-1.2-1.3-1.4-1.9-2.1-2.5-1.1-1.2-1.1-0.9-0.6-0.4-0.40.50.0-0.0-0.7-1.4-2.1-2.1-2.1-2.2-2.0-2.4-1.9-2.4-1.10.50.40.41.10.90.00.0
Percentage of Assets us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedTranslationAdjustment


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-31
Value-6.499-11.138-11.815-37.256-44.754-68.571-22.19-17.281-20.834-33.595-26.359-33.618-34.582254.8869.237-37.082-38.106-42.477-34.12-31.088-34.423-36.491-35.185-27.285-33.509-13.402
Percentage of StockholdersEquity-1.2-1.2-1.1-3.6-4.5-7.7-2.4-1.9-2.2-3.9-3.1-3.6-3.82.60.51.1-4.3-37.1-69.8325.058.830.627.622.016.024.0-8.3
Percentage of Assets-0.1-0.2-0.2-0.5-0.7-1.0-0.3-0.3-0.3-0.5-0.4-0.6-0.60.40.10.1-0.5-1.1-1.8-1.5-1.3-1.6-1.7-1.7-1.5-1.9-0.7
Percentage of Assets us-gaap:AccumulatedTranslationAdjustment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AdditionalPaidInCapital


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-312008-12-312007-12-31
Value203120031968196019411922189918851868185218231810179817881761863818764718679646611590570545
Percentage of StockholdersEquity385.1224.7180.6188.9195.9216.0202.4205.0193.9216.2214.4192.3195.1181.1179.11417.8-618.2474.3198.9221.7355.8327.1525.0-2677.23116.2
Percentage of Assets28.328.926.928.728.528.326.628.027.827.629.430.529.225.924.236.537.640.140.341.946.947.648.60.00.0
Percentage of Assets us-gaap:AdditionalPaidInCapital0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:CommonStock


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-312008-12-312007-12-31
Value0.0820.0820.0820.0820.0820.0820.0820.0820.0820.0820.0820.0820.0820.0820.0820.0780.0780.0780.0780.0780.0780.0780.0780.0780.078
Percentage of StockholdersEquity0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.1-0.10.00.00.00.00.00.1-0.40.4
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets us-gaap:CommonStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:RetainedEarnings


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-312008-12-312007-12-31
Value2690241922552135211820631988192118791776175516711659161316471644145012751091908742605509426322
Percentage of StockholdersEquity510.0271.4206.8205.9213.8231.8211.9208.9195.0207.3206.3177.5180.1163.4167.52700.5-1095.7791.1302.0296.2408.5323.8452.7-2000.51843.4
Percentage of Assets37.434.930.831.231.130.327.828.527.926.528.328.127.023.322.669.466.767.061.256.053.847.141.90.00.0
Percentage of Assets us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:TreasuryStock


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-312008-12-312007-12-31
Value-4111.995-3438.35-3034.823-2928.369-2927.093-2927.262-2871.546-2805.552-2711.312-2710.464-2688.6-2517.807-2512.332-2446.761-2426.792-2396.649-2357.306-1857.219-1457.034-1287.726-1213.481-1045.119-999.121-1016.748-874.046
Percentage of StockholdersEquity-779.3-385.6-278.3-282.3-295.3-328.8-305.9-305.1-281.3-316.3-316.0-267.4-272.7-247.8-246.8-3936.81780.4-1152.3-403.3-419.9-667.5-558.7-887.84769.9-4995.1
Percentage of Assets-57.2-49.6-41.5-42.8-43.0-43.0-40.2-41.6-40.3-40.4-43.4-42.4-40.8-35.4-33.3-101.2-108.4-97.5-81.7-79.4-87.9-81.3-82.20.00.0
Percentage of Assets us-gaap:TreasuryStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Common Stock Value

us-gaap:CommonStockValue

us-gaap:CommonStockValue


Common
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value82000.082000.082000.082000.082000.082000.082000.082000.082000.082000.082000.082000.082000.082000.082000.082000.082000.078000.078000.078000.078000.078000.078000.078000.078000.078000.078000.078000.078000.078000.078000.078000.078000.078000.078000.078000.078000.078000.078000.078000.078000.078000.078000.078000.0
Percentage of CommonStockValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Additional Paid In Capital

us-gaap:AdditionalPaidInCapital

us-gaap:AdditionalPaidInCapital


Additional
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value20312003196819601941192218991885186818521823181017981788176117481732880863851847832818806795781764754743733718707698689679671661651646636628619611590
Percentage of AdditionalPaidInCapital100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets28.328.926.928.728.528.326.628.027.827.629.430.529.225.924.224.924.826.236.537.436.837.737.638.642.743.740.142.741.441.740.343.443.344.041.945.447.948.346.948.848.548.647.648.6

Retained Earnings Accumulated Deficit

us-gaap:RetainedEarningsAccumulatedDeficit

us-gaap:RetainedEarningsAccumulatedDeficit


Retained
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value26902419225521352118206319881921187917761755167116591613164715391588168016441577153814901450138413541303127512151182112910911029991945908849818776742697667634605509
Percentage of RetainedEarningsAccumulatedDeficit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets37.434.930.831.231.130.327.828.527.926.528.328.127.023.322.622.022.749.969.469.366.867.466.766.272.872.867.068.765.864.261.263.261.460.356.057.459.357.553.853.551.549.847.141.9

Accumulated Other Comprehensive Income Loss Net Of Tax

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax


Accumulated
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value-82.978-93.178-99.228-130.213-142.175-168.972-77.938-81.264-73.479-61.566-39.867-22.684-24.051321.508-1.216-48.889-47.832-49.683-47.784-48.003-49.43-44.402-49.274-35.617-42.328-21.17-2.0019.9538.5528.3456.7342.3582.7635.9688.6733.6238.4475.7935.8114161411
Percentage of AccumulatedOtherComprehensiveIncomeLossNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets-1.2-1.3-1.4-1.9-2.1-2.5-1.1-1.2-1.1-0.9-0.6-0.4-0.40.50.0-0.0-0.7-1.4-2.1-2.1-2.1-2.2-2.0-2.4-1.9-2.4-1.1-0.10.60.50.50.40.10.20.40.60.30.60.40.41.11.31.10.9

Treasury Stock Value

us-gaap:TreasuryStockValue

us-gaap:TreasuryStockValue


Treasury
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value4111343830342928292729272871280527112710268825172512244624262424241824102396239123912387235723012284218218571816173716341457142213631318128712681268126412131146109410601045999
Percentage of TreasuryStockValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets57.249.641.542.843.043.040.241.640.340.443.442.440.835.433.334.634.671.6101.2105.0103.8107.9108.4110.1122.8122.097.5102.796.793.081.787.484.584.179.485.791.993.787.987.984.483.281.382.2

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

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue


Adjustments
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value26361515251112133110101430
Percentage of AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital


Adjustments
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value26361515251112133110101430
Percentage of AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets us-gaap:AdditionalPaidInCapital0.00.00.00.00.00.00.00.00.00.00.00.00.0

Net Cash Provided By Used In Operating Activities

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInOperatingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value575157260243343558221922735452491742.72422149112-29.605831281488.58791161435.663711221361673101120197110980187911288-24.663796469-7.966
Percentage of NetCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestIncomeOperating0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Net Cash Provided By Used In Investing Activities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-34.732-12.521-23.043-14.98-21.329-24.536-62.889-36.222-39.419-22.355-56.17273383-16.679-35.146-46.459-2523.954-140.015-17.809-11.007-47.873-7.36-10.812-207.931-11.982-11.632-15.37-6.365-16.587-124.455-8.726-8.137-9.987-9.648-13.537-10.985-23.033-7.118-18.234-14.26-5.755-3.705-9.483-4.518-4.736-15.108
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestIncomeOperating0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Net Cash Provided By Used In Financing Activities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-187.017-403.22-98.199-42.272-207.263-68.49-53.179-90.685-118.69-23.438-43.559-266.303-618.17-329.083-65.737-80.3271768917-43.753-97.162-60.61526-66.495115-62.091-54.41-12.184-78.377-85.833-32.276-16.002-56.769-44.178-36.906-14.1960.734-41.552-17.556-75.418-61.413-67.51417-98.035-45.235-43.01614
Percentage of NetCashProvidedByUsedInFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestIncomeOperating0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Amortization Of Financing Costs

us-gaap:AmortizationOfFinancingCosts

us-gaap:AmortizationOfFinancingCosts


Amortization
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value0.9910.9230.9372.0953.7551.6371.6321.6271.6221.6161.611.6048.7331.8681.8263.7619.0070.4680.4710.4531.7470.411-0.880.7970.7580.8371.0730.4720.5190.5810.6030.6350.6140.8580.4960.5040.4990.5090.5550.5510.5870.5950.7820.2540.2590.272
Percentage of AmortizationOfFinancingCosts100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Deferred Income Tax Expense Benefit

us-gaap:DeferredIncomeTaxExpenseBenefit

us-gaap:DeferredIncomeTaxExpenseBenefit


Deferred
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-1.5893.883-36.452-4.735-27.3525-20.682-1.376-23.884-25.534.6711321-39.175-116.857-21.446-66.006-11.99811-12.571.346-2.1915.688-8.0225.656-3.3581.885-5.749-2.9017.351116.7360.125-1.8724.2410.133-1.737-1.664-4.7775.2079.591-10.9864.09-5.9920.166-0.873
Percentage of DeferredIncomeTaxExpenseBenefit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Depreciation Depletion And Amortization

us-gaap:DepreciationDepletionAndAmortization us-gaap:ConsolidationItems

us-gaap:DepreciationDepletionAndAmortization

it:CorporateAndReconcilingItems


Depreciation
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-30
Value52565653535453525253526866687168831615151515151110
Percentage of DepreciationDepletionAndAmortization100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Increase Decrease In Accounts Receivable

us-gaap:IncreaseDecreaseInAccountsReceivable

us-gaap:IncreaseDecreaseInAccountsReceivable


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-78.458-54.192269-107.995-125.463-135.661281-74.291-62.451-78.39287-91.457-24.451-56.771353-29.849-12.985794-46.6221.29119101-43.463-3.951-9.631113-34.456-7.1194.2197-42.661-44.92217-92.774849.035-39.69574-4.10813-25.744636.211-12.56-8.799
Percentage of IncreaseDecreaseInAccountsReceivable100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Net Cash Provided By Used In Operating Activities

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInOperatingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value575157260243343558221922735452491742.72422149112-29.605831281488.58791161435.663711221361673101120197110980187911288-24.663796469-7.966
Percentage of NetCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestIncomeOperating0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Net Income Loss

us-gaap:NetIncomeLoss

us-gaap:NetIncomeLoss


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value271164119165575674110320841146-19.587107-48.18-92.2813666304740653051285933533761384636583141344530322936202019
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestIncomeOperating0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:NetIncomeLoss us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings


Net
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value271164165575674110320841146-19.587
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestIncomeOperating0.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of InterestIncomeOperating us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.0

Share Based Compensation

us-gaap:ShareBasedCompensation

us-gaap:ShareBasedCompensation


Share
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value26366.232151525111213311010143011143022109.52111159.1699.58810169.428.8086.865137.6867.47.2128.3579.27.9108.1157.87.89.1629.3367.36.89.159
Percentage of ShareBasedCompensation100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Net Cash Provided By Used In Investing Activities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-34.732-12.521-23.043-14.98-21.329-24.536-62.889-36.222-39.419-22.355-56.17273383-16.679-35.146-46.459-2523.954-140.015-17.809-11.007-47.873-7.36-10.812-207.931-11.982-11.632-15.37-6.365-16.587-124.455-8.726-8.137-9.987-9.648-13.537-10.985-23.033-7.118-18.234-14.26-5.755-3.705-9.483-4.518-4.736-15.108
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestIncomeOperating0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Net Cash Provided By Used In Financing Activities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-187.017-403.22-98.199-42.272-207.263-68.49-53.179-90.685-118.69-23.438-43.559-266.303-618.17-329.083-65.737-80.3271768917-43.753-97.162-60.61526-66.495115-62.091-54.41-12.184-78.377-85.833-32.276-16.002-56.769-44.178-36.906-14.1960.734-41.552-17.556-75.418-61.413-67.51417-98.035-45.235-43.01614
Percentage of NetCashProvidedByUsedInFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestIncomeOperating0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Proceeds From Issuance Of Long Term Debt

us-gaap:ProceedsFromIssuanceOfLongTermDebt

us-gaap:ProceedsFromIssuanceOfLongTermDebt


Proceeds
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value0.012008000.00.00.0-30.0350.00.00.00.00.01401930955-32.5-82.576070-10.013055265225-1.25231511.8751.8751.875200127.412-32.70547-5.0-5.0-30.01140173-36.01152
Percentage of ProceedsFromIssuanceOfLongTermDebt0.0100.0100.00.00.00.0100.0100.00.00.00.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProceedsFromIssuanceOfLongTermDebt us-gaap:DebtInstrument, us-gaap:LongtermDebtType

it:A2020CreditAgreement, it:TermLoanFacility


Proceeds
Period End2020-09-28
Value400
Percentage of ProceedsFromIssuanceOfLongTermDebt0.0

Repayments Of Long Term Debt

us-gaap:RepaymentsOfLongTermDebt

us-gaap:RepaymentsOfLongTermDebt


Repayments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value1005.1275.12712008520.967-0.033-0.0359018-109.31826155330464219101187.57.58155.05.05.05.05.01903.753.751.8751.8751.8751.8752007.57.57.57.55.05.05.1565.0252212114
Percentage of RepaymentsOfLongTermDebt100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RepaymentsOfLongTermDebt us-gaap:DebtInstrument, us-gaap:LongtermDebtType

it:A2020CreditAgreement, it:TermLoanFacility


Repayments
Period End2020-09-28
Value100
Percentage of RepaymentsOfLongTermDebt0.0

Payments For Repurchase Of Common Stock

us-gaap:PaymentsForRepurchaseOfCommonStock

us-gaap:PaymentsForRepurchaseOfCommonStock


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312016-01-312015-12-312015-09-302015-06-302015-03-312015-01-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value6843981002.2550.6987357941.719441568.12967284.0843.27511216.0720.9226.48457.256111173242.7447911119524594948224.6257.5187770533551231.3723935
Percentage of PaymentsForRepurchaseOfCommonStock100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PaymentsForRepurchaseOfCommonStock us-gaap:ShareRepurchaseProgram

it:OpenMarketPurchases


Payments
Period End2021-06-302021-03-31
Value0.08.0
Percentage of PaymentsForRepurchaseOfCommonStock0.02.0

us-gaap:PaymentsForRepurchaseOfCommonStock us-gaap:ShareRepurchaseProgram, us-gaap:SubsequentEventType

it:OpenMarketPurchases, us-gaap:SubsequentEvent


Payments
Period End2021-07-312021-04-30
Value1020
Percentage of PaymentsForRepurchaseOfCommonStock0.00.0

Effective Income Tax Rate Continuing Operations

us-gaap:EffectiveIncomeTaxRateContinuingOperations

us-gaap:EffectiveIncomeTaxRateContinuingOperations


Effective
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value28.523.64.8-19.70.0660.2250.1570.2210.1360.0120.5430.690.3840.5430.6920.2220.3540.2490.0260.3190.3790.334-0.0190.4140.3570.3590.0140.2710.3310.334-0.0120.3250.350.292-0.0250.330.3140.3210.0020.3140.3310.315-0.0360.3170.339
Percentage of EffectiveIncomeTaxRateContinuingOperations100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Deferred Tax Liabilities

us-gaap:DeferredTaxLiabilities

us-gaap:DeferredTaxLiabilities


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312011-12-312010-12-31
Value691101802233629
Percentage of DeferredTaxLiabilities100.0100.0100.0100.0100.0100.0

Unrecognized Tax Benefits

us-gaap:UnrecognizedTaxBenefits

us-gaap:UnrecognizedTaxBenefits


Unrecognized
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-312009-12-31
Value130125127118114103102878780906260636072644237313127252221212018171514181818172019191819171513
Percentage of UnrecognizedTaxBenefits100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Deferred Tax Assets Valuation Allowance

us-gaap:DeferredTaxAssetsValuationAllowance

us-gaap:DeferredTaxAssetsValuationAllowance


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value151.5564.13.21.4311.80.570.617-1.9431.8692.634
Percentage of DeferredTaxAssetsValuationAllowance100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

it:BusinessCombinationAcquisitionandIntegrationRelatedCosts

it:BusinessCombinationAcquisitionandIntegrationRelatedCosts


Business
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-30
Value1.3020.640.8441.7222.1571.565.3071.742-0.3582.77210172059163098139.64168.0338.368106.4883.6835.0925.8526.0156.6443.3560.0590.0720.106
Percentage of BusinessCombinationAcquisitionandIntegrationRelatedCosts100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

it:BusinessCombinationAcquisitionandIntegrationRelatedCosts us-gaap:ConsolidationItems

it:CorporateAndReconcilingItems


Business
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-30
Value1.3020.640.8441.7222.1571.565.3071.742-0.3582.77210171959163098139.64168.0338.368106.4883.683
Percentage of BusinessCombinationAcquisitionandIntegrationRelatedCosts100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.199.899.9100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

it:BusinessCombinationFutureCompensationExpense us-gaap:BusinessAcquisition

it:BusinessCombinationFutureCompensationExpense

it:PulseQAInc


Business
Period End2021-06-17
Value4500000.0
Percentage of BusinessCombinationFutureCompensationExpense100.0

it:EffectiveIncomeTaxRateReconciliationIntercompanySaleOfIntellectualPropertyAmount

it:EffectiveIncomeTaxRateReconciliationIntercompanySaleOfIntellectualPropertyAmount


Effective
Period End2020-09-302020-06-302019-09-302019-06-30
Value0-28300000.00-38100000.0
Percentage of EffectiveIncomeTaxRateReconciliationIntercompanySaleOfIntellectualPropertyAmount0.0100.00.0100.0

it:FiniteLivedIntangibleAssetsFullyAmortizedIntangibles

it:FiniteLivedIntangibleAssetsFullyAmortizedIntangibles


Finite
Period End2020-12-312020-09-302019-12-312019-09-302019-06-302019-03-312018-12-312018-03-312017-12-312016-12-312015-12-312015-09-302015-06-302015-03-31
Value20242.6780.60618859.0690.2280.00.00.00.00.013
Percentage of FiniteLivedIntangibleAssetsFullyAmortizedIntangibles100.0100.0100.0100.0100.0100.0100.0100.00.00.00.00.00.0100.0

it:FiniteLivedIntangibleAssetsFullyAmortizedIntangibles us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:ComputerSoftwareIntangibleAsset


Finite
Period End2020-12-312020-09-302019-12-312019-09-302019-06-302019-03-312018-12-312018-03-312017-12-312016-12-312015-12-312015-09-302015-06-302015-03-31
Value0.01.5740.00.00.00.09.090.00.00.00.00.00.00.0
Percentage of FiniteLivedIntangibleAssetsFullyAmortizedIntangibles0.06.40.00.00.00.0100.20.00.00.00.00.00.00.0

us-gaap:CustomerRelationships


Finite
Period End2020-12-312020-09-302019-12-312019-09-302019-06-302019-03-312018-12-312018-03-312017-12-312016-12-312015-12-312015-09-302015-06-302015-03-31
Value0.7441.650.00.00.00.00.00.00.00.00.00.00.07.21
Percentage of FiniteLivedIntangibleAssetsFullyAmortizedIntangibles3.76.70.00.00.00.00.00.00.00.00.00.00.054.5

us-gaap:MediaContent


Finite
Period End2020-12-312020-09-302019-12-312019-09-302019-06-302019-03-312018-12-312018-03-312017-12-312016-12-312015-12-312015-09-302015-06-302015-03-31
Value0.0190.00.00.006850.00.2280.00.00.00.00.00.0
Percentage of FiniteLivedIntangibleAssetsFullyAmortizedIntangibles0.080.70.00.00.0100.00.0100.00.00.00.00.00.00.0

us-gaap:OtherIntangibleAssets


Finite
Period End2020-12-312020-09-302019-12-312019-09-302019-06-302019-03-312018-12-312018-03-312017-12-31
Value191.5442.6780.606180.0-0.0210.00.0
Percentage of FiniteLivedIntangibleAssetsFullyAmortizedIntangibles96.36.3100.0100.0100.00.0-0.20.00.0

it:InterestExpenseandOtherNonoperatingIncome

it:InterestExpenseandOtherNonoperatingIncome


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-30
Value3110-216.431284027-158.989162425252736343437445.0172.5023.9786.1084.1224.9540.6825.7084.4423.5522.9432.505
Percentage of InterestExpenseandOtherNonoperatingIncome100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

it:OperatingLeaseCostSubleasingActivities

it:OperatingLeaseCostSubleasingActivities


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value101010101010101010
Percentage of OperatingLeaseCostSubleasingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0

it:OperatingLeaseRightOfUseAssetReductionInCarryingAmount

it:OperatingLeaseRightOfUseAssetReductionInCarryingAmount


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value18181819202222212120
Percentage of OperatingLeaseRightOfUseAssetReductionInCarryingAmount100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

it:TreasuryStockAveragePricePaidPerShare

it:TreasuryStockAveragePricePaidPerShare


Treasury
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-31
Value0.000218330.000180440.000131350.000116290.000151220.000134419999999999980.000155370.000140460000000000020.000140090.000131230.000118730000000000010.000122530.00011620.000100479.333e-059.803e-058.201999999999999e-058.379000000000001e-058.403000000000001e-058.183e-057.294e-056.959e-057.034000000000001e-055.826e-055.717e-05494.8270000000000004e-054.067e-053.8979999999999996e-053.458e-053.8560000000000004e-053.6780000000000004e-05
Percentage of TreasuryStockAveragePricePaidPerShare100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:BusinessCombinationConsiderationTransferred1 us-gaap:BusinessAcquisition

us-gaap:BusinessCombinationConsiderationTransferred1

it:PulseQAInc


Business
Period End2021-06-17
Value30
Percentage of BusinessCombinationConsiderationTransferred1100.0

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect


Cash
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value353-258.443139186114-37.277-33.2339269-10.197-54.58456-61.052-343.038-78.643-2.362-642.994765
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths us-gaap:DerivativeInstrumentRisk

us-gaap:CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths

us-gaap:InterestRateSwap


Cash
Period End2021-06-302021-03-31
Value2100000.0-29200000.0
Percentage of CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths100.0100.0

us-gaap:ContractWithCustomerLiabilityRevenueRecognized

us-gaap:ContractWithCustomerLiabilityRevenueRecognized


Contract
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value817726139681692658124675708650123642651605
Percentage of ContractWithCustomerLiabilityRevenueRecognized100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DebtInstrumentInterestRateDuringPeriod

us-gaap:DebtInstrumentInterestRateDuringPeriod


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-09-302019-06-302018-09-302018-06-302017-09-302017-06-30
Value4.965.020.065.480.04280.040.04050.04240.04280.04010.0362
Percentage of DebtInstrumentInterestRateDuringPeriod100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost

us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost


Defined
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value1.821.21.01.11.630.90.90.81.350.90.90.71.1750.90.80.71.0550.90.80.71.150.80.60.71.0850.80.80.71.3650.80.80.80.80.60.60.60.7050.60.70.60.630.60.4
Percentage of DefinedBenefitPlanNetPeriodicBenefitCost100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:Depreciation

us-gaap:Depreciation


Depreciation
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value2525252222222120201918171616181718109.7829.5319.0258.8348.858.518.447.9898.0617.9457.7217.4597.6217.2587.0177.16.9916.3016.1825.8956.3966.6386.2346.2716.1316.1946.446.584
Percentage of Depreciation100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DepreciationAndAmortization

us-gaap:DepreciationAndAmortization


Depreciation
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value5256565353545352525352686668716883161515151515129.6061010109.78.7388.9788.6098.4218.4348.3647.6637.116.6347.1337.3778.7568.7988.6628.7258.9779.51
Percentage of DepreciationAndAmortization100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DerivativeGainLossOnDerivativeNet

us-gaap:DerivativeGainLossOnDerivativeNet


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value-8.7778.791-7.007-7.344-17.037-15.791-0.078-2.863-0.2954.10911-0.289-8.5526.28712-0.39-2.916-1.59413-1.081-2.209-2.3226.1766-2.393-2.269-1.512-2.9451.0221.0390.89-3.1151.0141.0931.013
Percentage of DerivativeGainLossOnDerivativeNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

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

us-gaap:InterestRateSwap, it:InterestIncomeExpense


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-31
Value7.37.07.27.27.33.2
Percentage of DerivativeGainLossOnDerivativeNet-83.279.6-102.8-98.0-42.8-20.3

us-gaap:InterestRateSwap, us-gaap:OtherExpense


Derivative
Period End2020-12-312020-09-302020-06-30
Value0.00.010
Percentage of DerivativeGainLossOnDerivativeNet-0.0-0.0-60.5

us-gaap:DerivativeGainLossOnDerivativeNet us-gaap:IncomeStatementLocation

it:InterestIncomeExpense


Derivative
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-30
Value-7.283-7.032-7.165-7.322-3.1921.5042.242.2710.8510.355-0.945-2.154-2.331
Percentage of DerivativeGainLossOnDerivativeNet83.0-80.097.643.020.2-52.5-759.355.3-294.5-4.2-15.0552.379.9

it:OtherGainLossNet


Derivative
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-31
Value-1.49415-0.179-9.715-12.599-4.367-2.5351.838-1.14-8.9077.2321.764-0.585-0.219
Percentage of DerivativeGainLossOnDerivativeNet17.0180.02.457.079.8152.5859.344.7394.5104.2115.0-452.320.113.7

us-gaap:DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet

us-gaap:DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet


Derivative
Period End2021-06-302021-03-312020-12-31
Value-4.014152.633
Percentage of DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet100.0100.0100.0

us-gaap:EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents

us-gaap:EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents


Effect
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value0.864-8.145191014-15.7097.342-4.342-0.190.804-0.045-3.432-6.6223.61-2.475174.3996.007
Percentage of EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FiniteLivedIntangibleAssetsForeignCurrencyTranslationGainLoss

us-gaap:FiniteLivedIntangibleAssetsForeignCurrencyTranslationGainLoss


Finite
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-06-302016-03-31
Value7.121.0010.5046.56219-37.925-0.046-6.569-12.3358.683-10.173-9.489-24.121150.88121-2.3260.314-0.8470.1680.004
Percentage of FiniteLivedIntangibleAssetsForeignCurrencyTranslationGainLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FiniteLivedIntangibleAssetsForeignCurrencyTranslationGainLoss us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:ComputerSoftwareIntangibleAsset


Finite
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-06-302016-03-31
Value0.1730.0530.0240.1990.597-1.171-0.029-0.19-0.3910.278-0.302-0.07-0.8060.491-5.571.886-0.7340.042-0.114-0.056-0.085
Percentage of FiniteLivedIntangibleAssetsForeignCurrencyTranslationGainLoss2.45.34.83.03.13.163.02.93.23.23.00.73.33.1-632.28.631.613.413.5-33.3-2125.0

us-gaap:CustomerRelationships


Finite
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-06-302016-03-31
Value6.9470.948-0.1566.43418-36.507-0.043-6.237-11.9178.344-9.5-6.729-22.1711511110.2880.19-0.5370.310.204
Percentage of FiniteLivedIntangibleAssetsForeignCurrencyTranslationGainLoss97.694.7-31.098.096.996.393.594.996.696.193.470.991.996.41330.153.1-12.460.563.4184.55100.0

us-gaap:MediaContent


Finite
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-06-302016-03-31
Value0.492-0.0710.0-0.1750.004-0.001-0.0010.0-0.247-3.518-0.8150.251-4.3827.984-1.9410.037-0.092-0.14-0.15
Percentage of FiniteLivedIntangibleAssetsForeignCurrencyTranslationGainLoss97.6-1.10.00.5-8.70.00.00.02.437.13.41.6-497.436.583.411.810.9-83.3-3750.0

us-gaap:OtherIntangibleAssets


Finite
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value0.1440.00.0-0.0720.022-0.141-0.0260.061-0.1240.828-0.329-0.171-0.885
Percentage of FiniteLivedIntangibleAssetsForeignCurrencyTranslationGainLoss28.60.00.00.2-47.82.10.20.71.2-8.71.4-1.1-100.5

us-gaap:GoodwillForeignCurrencyTranslationGainLoss

us-gaap:GoodwillForeignCurrencyTranslationGainLoss


Goodwill
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-31
Value0.794-2.0473.0997.943-10.069.4123-16.45.77217-10.105260.8112.655
Percentage of GoodwillForeignCurrencyTranslationGainLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:GoodwillForeignCurrencyTranslationGainLoss us-gaap:StatementBusinessSegments

it:Conferences


Goodwill
Period End2021-06-302021-03-312020-09-302020-06-302020-03-31
Value0.018-0.0380.0321.275-1.278
Percentage of GoodwillForeignCurrencyTranslationGainLoss2.31.91.016.112.7

it:Consulting


Goodwill
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-31
Value0.257-0.0920.294-0.464-0.064-0.149-0.0960.0470.009-0.8630.5280.9060.2720.197
Percentage of GoodwillForeignCurrencyTranslationGainLoss32.44.59.5-5.80.6-1.6-0.4-0.30.2-4.8-5.23.433.57.4

it:ResearchSegment


Goodwill
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-31
Value0.519-1.9172.7737.132-8.7189.55123-16.3865.43718-17.958191.6752.376
Percentage of GoodwillForeignCurrencyTranslationGainLoss65.493.689.589.886.7101.5100.199.994.2103.1177.772.9206.589.5

us-gaap:IncreaseDecreaseInAccountsPayableAndAccruedLiabilities

us-gaap:IncreaseDecreaseInAccountsPayableAndAccruedLiabilities


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value60-272.49515748175-269.4671276.89228-218.153134494.517-133.0797813779-109.0251033850-136.3081105835-121.6221143946-104.513821726-85.574743020-88.112891622-84.5127521
Percentage of IncreaseDecreaseInAccountsPayableAndAccruedLiabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInDeferredCharges

us-gaap:IncreaseDecreaseInDeferredCharges


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-10.7310.23747-24.839-13.735-17.5265-12.355-18.901-4.07369-16.398-22.330.51264-2.7542.525-3.002312.945-8.274-7.04731-2.712-7.187-8.35236-6.507-9.461-8.57828-1.208-12.964.113-22.07322-6.061-3.66518-3.793-4.496-3.06517-2.188-7.631-5.866
Percentage of IncreaseDecreaseInDeferredCharges100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInDeferredRevenue

us-gaap:IncreaseDecreaseInDeferredRevenue


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value59131226-60.555-123.387-26.22811122-37.81785118-18.4211076184307592-16.2187.4262779-17.7551619741215116516-2.658165110131134173810252533-4.0230
Percentage of IncreaseDecreaseInDeferredRevenue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInOtherOperatingAssets

us-gaap:IncreaseDecreaseInOtherOperatingAssets


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value13105.4412.5776.893-5.961-19.651-2.572128110.418-9.441-14.421-58.019590.598161.592-23.1346.973-5.4361.855241.763-12.9275.836-2.4052.3971.3112.2040.5368.995-6.467120.584-0.2962.141-2.346-2.843-0.5521.344-2.1872.745276.442
Percentage of IncreaseDecreaseInOtherOperatingAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets

us-gaap:IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value-9.1119.933-46.99923-26.85812-19.92617-7.843-8.891-13.844-18.5132953-45.419.706175.315-21.798447.538-8.205-29.07925-5.77122-20.814180.634.366-19.653168.405-4.4678.199-26.241.3326.105-9.7814.143-7.0699.167-2.8368.362
Percentage of IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncrementalCommonSharesAttributableToShareBasedPaymentArrangements

us-gaap:IncrementalCommonSharesAttributableToShareBasedPaymentArrangements


Incremental
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value877000.0787000.07000.0577000.0457000.0847000.012000.01041000.01076000.01122000.020000.01294000.01108000.001324000.0001260000.037000.01165000.0917000.01013000.013000.01124000.01068000.01234000.010000.01195000.01223000.01540000.01000.01666000.01614000.01942000.036000.02089000.02073000.02783000.0-178000.02202000.02454000.03009000.0201000.03324000.03198000.0
Percentage of IncrementalCommonSharesAttributableToShareBasedPaymentArrangements100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InsuredEventGainLoss

us-gaap:InsuredEventGainLoss


Insured
Period End2021-05-312021-06-30
Value135135
Percentage of InsuredEventGainLoss100.0100.0

us-gaap:LeaseCost

us-gaap:LeaseCost


Lease
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value262628312831342929
Percentage of LeaseCost100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingLeaseCost

us-gaap:OperatingLeaseCost


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value323233343537373536
Percentage of OperatingLeaseCost100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingLeasePayments

us-gaap:OperatingLeasePayments


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value353434343434353433
Percentage of OperatingLeasePayments100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax

us-gaap:OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax


Other
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value4.6390.6776.46513-93.435-6.731-10.324-20.0891.7833.234-15.3575.628-21.964-19.802-12.5890.774-0.410.9853.749-1.007-3.776
Percentage of OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax us-gaap:StatementEquityComponents

us-gaap:AccumulatedGainLossNetCashFlowHedgeParent


Other
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-30
Value-1.033-9.935-47.054-10.285-23.085-12.8530.9694.0059.3650.009-3.528
Percentage of OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax-16.0-71.650.4152.8223.664.054.30.00.00.00.0

us-gaap:AccumulatedTranslationAdjustment


Other
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-30
Value4.6390.6777.49823-46.3813.55312-7.2360.8140.29520461.0244.371-8.357-3.0323.3352.068-1.306-7.96.224-20.107-15.471-12.5880.876-0.2781.4034.109-1.22
Percentage of OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax100.0100.0116.0171.649.6-52.8-123.636.045.70.00.00.00.00.00.00.00.00.0-40.451.4110.691.578.1100.0113.267.8142.4109.6121.2

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value5457000.0-72834000.06513000.04379000.02900000.0-91896000.011205000.0-11379000.0-24715000.0-22275000.0
Percentage of OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

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

us-gaap:OtherLiabilities, us-gaap:InterestRateSwap, us-gaap:DesignatedAsHedgingInstrument


Other
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value6513000.04379000.02900000.0-91896000.011205000.0-11379000.0-24715000.0-22275000.0
Percentage of OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherLiabilities, us-gaap:InterestRateSwap, us-gaap:Nondesignated


Other
Period End2021-06-302021-03-31
Value5457000.0-72834000.0
Percentage of OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax100.0100.0

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax us-gaap:DerivativeInstrumentRisk, us-gaap:IncomeStatementLocation

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax

us-gaap:InterestRateSwap, us-gaap:OtherExpense


Other
Period End2020-12-312020-09-302020-06-30
Value0.00.010
Percentage of OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax0.00.0100.0

us-gaap:OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax

us-gaap:OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-31
Value-104000.0-103000.0969000.0-85000.0-80000.0-79000.02970000.0-41000.0-41000.0-42000.041000.0-53000.0-55000.0-56000.0213000.0-52000.0-49000.0-48000.01077000.0-37000.0-38000.0-37000.0-1037000.0-53000.0-53000.0-53000.0-15000.0-14000.0-15000.0-6000.0-1000.0-23000.051000.052000.054000.0
Percentage of OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PaymentsForCapitalImprovements

us-gaap:PaymentsForCapitalImprovements


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value1112231421245336392062242217353330101211186.5610121111126.3659.9669.1858.7268.1379.9879.6481310137.11818145.7553.7059.4834.5184.2813.412
Percentage of PaymentsForCapitalImprovements100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PaymentsOfDebtExtinguishmentCosts

us-gaap:PaymentsOfDebtExtinguishmentCosts


Payments
Period End2020-12-31
Value0.0
Percentage of PaymentsOfDebtExtinguishmentCosts0.0

us-gaap:PaymentsOfDebtExtinguishmentCosts us-gaap:DebtInstrument, us-gaap:LongtermDebtType

it:SeniorNotesDue2025, us-gaap:SeniorNotes


Payments
Period End2020-09-28
Value30
Percentage of PaymentsOfDebtExtinguishmentCosts0.0

us-gaap:PaymentsOfFinancingCosts

us-gaap:PaymentsOfFinancingCosts


Payments
Period End2020-09-30
Value13
Percentage of PaymentsOfFinancingCosts100.0

us-gaap:PaymentsToAcquireBusinessesNetOfCashAcquired us-gaap:BusinessAcquisition

us-gaap:PaymentsToAcquireBusinessesNetOfCashAcquired

it:PulseQAInc


Payments
Period End2021-06-17
Value22
Percentage of PaymentsToAcquireBusinessesNetOfCashAcquired100.0

us-gaap:ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions

us-gaap:ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions


Proceeds
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value4.0575.3574.2724.0944.0785.6414.3944.1583.9945.0833.5553.5073.5034.1243.1612.8882.643.0222.3192.2292.1222.581.9161.7591.7482.0761.4021.3012.6362.4281.5031.1841.41.9551.871.8093.2275.5242.241.4242.289144.1478.383
Percentage of ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProceedsFromLeasePayments

us-gaap:ProceedsFromLeasePayments


Proceeds
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value1010109.5929.5039.4179.319.08.303
Percentage of ProceedsFromLeasePayments100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProceedsFromLinesOfCredit

us-gaap:ProceedsFromLinesOfCredit


Proceeds
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value5.00.0300272828
Percentage of ProceedsFromLinesOfCredit100.00.0100.0100.0100.0100.0

us-gaap:ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax

us-gaap:ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax


Reclassification
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-30
Value-5.561-5.373-5.497-12.915-2.4011.0541.5891.610.416-1.638-1.7-1.083-0.806-0.633-0.635-0.627-0.617-0.626-0.627-0.602
Percentage of ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax us-gaap:StatementEquityComponents

us-gaap:AccumulatedDefinedBenefitPlansAdjustment


Reclassification
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-30
Value-0.104-0.103-0.085-0.08-0.079-0.041-0.041-0.042-0.053-0.055-0.056-0.052-0.049-0.048-0.036-0.037-0.038-0.037-0.051-0.053-0.053-0.053-0.014-0.015-0.014-0.015-0.011-0.006-0.001
Percentage of ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax1.91.91.50.63.3-3.9-2.6-2.6-12.70.00.00.00.00.00.00.00.00.03.13.14.96.62.22.42.22.41.81.00.2

us-gaap:AccumulatedGainLossNetCashFlowHedgeParent


Reclassification
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-30
Value-5.457-5.27-5.412-12.835-2.3221.0941.631.6520.6190.321-0.749-1.293-1.398
Percentage of ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax98.198.198.599.496.7103.8102.6102.6148.80.00.00.00.0

us-gaap:RepaymentsOfLinesOfCredit

us-gaap:RepaymentsOfLinesOfCredit


Repayments
Period End2021-06-302021-03-312020-12-312020-09-302019-12-312019-09-30
Value0.05.00.00.00.00.0
Percentage of RepaymentsOfLinesOfCredit0.0100.00.00.00.00.0

us-gaap:RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability

us-gaap:RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability


Right
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value2.2487.0468.1970.5273.61614693827
Percentage of RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StockGrantedDuringPeriodValueSharebasedCompensation

us-gaap:StockGrantedDuringPeriodValueSharebasedCompensation


Stock
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value4.085.384.1124.095.6544.4014.1714.0155.0623.6523.463-1.0774.143
Percentage of StockGrantedDuringPeriodValueSharebasedCompensation100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StockGrantedDuringPeriodValueSharebasedCompensation us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital


Stock
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value2.063-1.5433.1333.223-1.7942.7883.5383.14-2.9113.0111.752-4.312-4.296
Percentage of StockGrantedDuringPeriodValueSharebasedCompensation50.6-28.776.278.8-31.763.384.878.2-57.582.450.6400.4-103.7

us-gaap:TreasuryStock


Stock
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value2.0176.9230.9790.8677.4481.6130.6330.8757.9730.6411.7113.2358.439
Percentage of StockGrantedDuringPeriodValueSharebasedCompensation49.4128.723.821.2131.736.715.221.8157.517.649.4-300.4203.7

us-gaap:StockRepurchasedDuringPeriodValue

us-gaap:StockRepurchasedDuringPeriodValue


Stock
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value6754102.2550.6986367941.723291717.1866828
Percentage of StockRepurchasedDuringPeriodValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StockRepurchasedDuringPeriodValue us-gaap:StatementEquityComponents

us-gaap:TreasuryStock


Stock
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value6754102.2550.6986367941.723291717.1866828
Percentage of StockRepurchasedDuringPeriodValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:SubleaseIncome

us-gaap:SubleaseIncome


Sublease
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value1010106.77710118.1341010
Percentage of SubleaseIncome100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:UnusualOrInfrequentItemInsuranceProceeds

us-gaap:UnusualOrInfrequentItemInsuranceProceeds


Unusual
Period End2021-05-31
Value150
Percentage of UnusualOrInfrequentItemInsuranceProceeds100.0

us-gaap:VariableLeaseCost

us-gaap:VariableLeaseCost


Variable
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value4.1214.3025.0814.0063.9734.4034.8873.9023.64
Percentage of VariableLeaseCost100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:WriteOffOfDeferredDebtIssuanceCost us-gaap:DebtInstrument, us-gaap:LongtermDebtType

us-gaap:WriteOffOfDeferredDebtIssuanceCost

it:SeniorNotesDue2025, us-gaap:SeniorNotes


Write
Period End2020-09-28
Value14
Percentage of WriteOffOfDeferredDebtIssuanceCost100.0

it:AllowanceForDoubtfulAccountsReceivableRevenueReserve

it:AllowanceForDoubtfulAccountsReceivableRevenueReserve


Allowance
Period End2020-12-312019-12-312018-12-31
Value10000000.07800000.07400000.0
Percentage of AllowanceForDoubtfulAccountsReceivableRevenueReserve100.0100.0100.0

it:AveragemarketpricepershareofCommonStockduringtheyear

it:AveragemarketpricepershareofCommonStockduringtheyear


Averagemarketpricepershareof
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value130.95148.38135.6116.0992.5886.0273.2757.543.837.53
Percentage of AveragemarketpricepershareofCommonStockduringtheyear100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

it:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedFiniteLivedIntangibleAssetsAndGoodwill us-gaap:BusinessAcquisition

it:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedFiniteLivedIntangibleAssetsAndGoodwill

it:PulseQAInc


Business
Period End2021-06-17
Value30
Percentage of BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedFiniteLivedIntangibleAssetsAndGoodwill100.0

it:DebtLongtermandShorttermCombinedAmountGross

it:DebtLongtermandShorttermCombinedAmountGross


Debt
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302016-12-31
Value20062006220622072207220723282312220224643018332333873467702
Percentage of DebtLongtermandShorttermCombinedAmountGross100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

it:DeferredTaxAssetsAccruedExpenses

it:DeferredTaxAssetsAccruedExpenses


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value8167968062676756494039
Percentage of DeferredTaxAssetsAccruedExpenses100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

it:DeferredTaxAssetsLeasingArrangements

it:DeferredTaxAssetsLeasingArrangements


Deferred
Period End2020-12-312019-12-312018-12-31
Value51540.0
Percentage of DeferredTaxAssetsLeasingArrangements100.0100.00.0

it:DeferredTaxAssetsOperatingLossAndTaxCreditCarryforwards

it:DeferredTaxAssetsOperatingLossAndTaxCreditCarryforwards


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value231414597.7668.5221317222419
Percentage of DeferredTaxAssetsOperatingLossAndTaxCreditCarryforwards100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

it:DeferredTaxLiabilitiesDepreciation

it:DeferredTaxLiabilitiesDepreciation


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value9.852153.4210.962119.9041012-8.9959.1995.595
Percentage of DeferredTaxLiabilitiesDepreciation100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

it:DefinedBenefitPlanReinsuranceAsset

it:DefinedBenefitPlanReinsuranceAsset


Defined
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-31
Value10000000.08900000.09000000.09100000.07800000.07900000.0
Percentage of DefinedBenefitPlanReinsuranceAsset100.0100.0100.0100.0100.0100.0

it:EmployeeStockPurchasePlanMaximumNumberofSharesthatMaybePurchasebyEligibleParticipants us-gaap:PlanName

it:EmployeeStockPurchasePlanMaximumNumberofSharesthatMaybePurchasebyEligibleParticipants

it:EmployeeStockPurchasePlan


Employee
Period End2020-12-31
Value400000.0
Percentage of EmployeeStockPurchasePlanMaximumNumberofSharesthatMaybePurchasebyEligibleParticipants100.0

it:FiniteLivedIntangibleAssetExpectedAmortizationAfterYearFour

it:FiniteLivedIntangibleAssetExpectedAmortizationAfterYearFour


Finite
Period End2021-06-302021-03-312020-09-30
Value340336409
Percentage of FiniteLivedIntangibleAssetExpectedAmortizationAfterYearFour100.0100.0100.0

it:FloatingEurodollarBaseRate us-gaap:DebtInstrument, us-gaap:LongtermDebtType

it:FloatingEurodollarBaseRate

it:A2020CreditAgreement, it:TermLoanFacility


Floating
Period End2020-09-30
Value0.19
Percentage of FloatingEurodollarBaseRate100.0

it:LesseeOperatingLeaseLeaseNotYetCommencedPaymentsDue

it:LesseeOperatingLeaseLeaseNotYetCommencedPaymentsDue


Lessee
Period End2020-12-31
Value29
Percentage of LesseeOperatingLeaseLeaseNotYetCommencedPaymentsDue100.0

it:NumberofEnterprisesServed

it:NumberofEnterprisesServed


Numberof
Period End2020-12-312020-06-302020-03-312017-06-30
Value14000.014000.015000.011000.0
Percentage of NumberofEnterprisesServed100.0100.0100.0100.0

it:OperatingLeasesConcentrationPercentageOfPayments us-gaap:StatementGeographical

it:OperatingLeasesConcentrationPercentageOfPayments

country:US


Operating
Period End2020-12-31
Value80.0
Percentage of OperatingLeasesConcentrationPercentageOfPayments100.0

it:OtherLiabilitiesNoncurrentOther

it:OtherLiabilitiesNoncurrentOther


Other
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value12493505469894224222313
Percentage of OtherLiabilitiesNoncurrentOther100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

it:SeveranceandRetentionBonusPayable

it:SeveranceandRetentionBonusPayable


Severanceand
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-31
Value2624284422382610
Percentage of SeveranceandRetentionBonusPayable100.0100.0100.0100.0100.0100.0100.0100.0

it:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingWeightedAverageExercisePrice us-gaap:AwardType

it:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingWeightedAverageExercisePrice

us-gaap:StockAppreciationRightsSARS


Share
Period End2020-12-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302011-12-31
Value123.59104.05100.54100.54100.5489.4588.786.0185.0676.7376.6476.6473.1666.2265.164.4861.3156.4753.3753.3751.0544.4444.0140.2340.2834.1430.1130.1128.6224.5924.2723.4520.39
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingWeightedAverageExercisePrice100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

it:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsTargetPerformancePercentage us-gaap:TitleOfIndividual, us-gaap:AwardType

it:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsTargetPerformancePercentage

srt:ExecutiveOfficer, us-gaap:PerformanceShares


Share
Period End2021-06-302021-03-312021-02-03
Value50.050.095.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsTargetPerformancePercentage100.0100.0100.0

it:ShareBasedCompensationArrangementbyShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingIntrinsicValue. us-gaap:AwardType

it:ShareBasedCompensationArrangementbyShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingIntrinsicValue.

us-gaap:StockAppreciationRightsSARS


Share
Period End2020-12-31
Value38
Percentage of ShareBasedCompensationArrangementbyShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingIntrinsicValue.100.0

it:SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedandExpectedtoVestExercisableAggregateIntrinsicValue. us-gaap:AwardType

it:SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedandExpectedtoVestExercisableAggregateIntrinsicValue.

us-gaap:StockAppreciationRightsSARS


Sharebased
Period End2020-12-31
Value25
Percentage of SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedandExpectedtoVestExercisableAggregateIntrinsicValue.100.0

it:SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsVestedExpectedtoVestandExercisableWeightedAverageGrantDateFairValue. us-gaap:AwardType

it:SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsVestedExpectedtoVestandExercisableWeightedAverageGrantDateFairValue.

us-gaap:StockAppreciationRightsSARS


Sharebased
Period End2020-12-31
Value23.3
Percentage of SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsVestedExpectedtoVestandExercisableWeightedAverageGrantDateFairValue.100.0

it:SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsVestedandExpectedtoVestExercisableWeightedAverageExercisePrice. us-gaap:AwardType

it:SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsVestedandExpectedtoVestExercisableWeightedAverageExercisePrice.

us-gaap:StockAppreciationRightsSARS


Sharebased
Period End2020-12-31
Value104.97
Percentage of SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsVestedandExpectedtoVestExercisableWeightedAverageExercisePrice.100.0

it:StockRepurchaseProgramAdditionalAuthorizedAmount

it:StockRepurchaseProgramAdditionalAuthorizedAmount


Stock
Period End2021-04-302021-02-282021-02-04
Value500300300
Percentage of StockRepurchaseProgramAdditionalAuthorizedAmount100.0100.0100.0

it:StockRepurchaseProgramAdditionalAuthorizedAmount us-gaap:SubsequentEventType

us-gaap:SubsequentEvent


Stock
Period End2021-02-04
Value300
Percentage of StockRepurchaseProgramAdditionalAuthorizedAmount100.0

it:TaxesPayableNoncurrent

it:TaxesPayableNoncurrent


Taxes
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value8663666619138.5069.59162018
Percentage of TaxesPayableNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

it:UnrecognizedTaxBenefitsthatWouldResultAdjustmentstoOtherTaxAccounts

it:UnrecognizedTaxBenefitsthatWouldResultAdjustmentstoOtherTaxAccounts


Unrecognized
Period End2020-12-31
Value8600000.0
Percentage of UnrecognizedTaxBenefitsthatWouldResultAdjustmentstoOtherTaxAccounts100.0

us-gaap:AccountsReceivableGrossCurrent

us-gaap:AccountsReceivableGrossCurrent


Accounts
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302018-12-31
Value11101184125195810591157133410361262
Percentage of AccountsReceivableGrossCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AccruedBonusesCurrent

us-gaap:AccruedBonusesCurrent


Accrued
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value224192170162105908375686264
Percentage of AccruedBonusesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AccruedSalesCommissionCurrent

us-gaap:AccruedSalesCommissionCurrent


Accrued
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value13014212610868666457494241
Percentage of AccruedSalesCommissionCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AllowanceForDoubtfulAccountsReceivableCurrent

us-gaap:AllowanceForDoubtfulAccountsReceivableCurrent


Allowance
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312011-12-312010-12-312009-12-31
Value8.09.010.010.0119.08.07.87.87.77.77.77.27.11210.09.47.97.47.07.357.26.96.566.86.66.76.97.57.17.00.06.36.126.47.267.28.1
Percentage of AllowanceForDoubtfulAccountsReceivableCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0

us-gaap:AociLossCashFlowHedgeCumulativeGainLossAfterTax us-gaap:DerivativeInstrumentRisk

us-gaap:AociLossCashFlowHedgeCumulativeGainLossAfterTax

us-gaap:InterestRateSwap


Aoci
Period End2021-06-302021-03-312020-12-312020-09-30
Value8997104111
Percentage of AociLossCashFlowHedgeCumulativeGainLossAfterTax100.0100.0100.0100.0

us-gaap:AssetsFairValueDisclosure

us-gaap:AssetsFairValueDisclosure


Assets
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302011-12-31
Value99968978746577707073679594939343414038373535343235353533343332302929274138
Percentage of AssetsFairValueDisclosure100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AssetsFairValueDisclosure us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:ForeignExchangeForward, us-gaap:FairValueInputsLevel2


Assets
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-31
Value0.0440.0410.8850.0710.0710.141.5580.0650.0760.1961.3180.220.320.1562.0530.0640.0350.0390.165
Percentage of AssetsFairValueDisclosure0.00.01.00.10.10.22.00.10.10.31.90.20.30.22.20.10.10.10.4

us-gaap:AssetsFairValueDisclosure us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency

us-gaap:ForeignExchangeForward, us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring


Assets
Period End2020-12-312019-12-31
Value0.8851.558
Percentage of AssetsFairValueDisclosure1.02.0

us-gaap:AssetsFairValueDisclosure us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:FairValueInputsLevel1


Assets
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-31
Value8.6426.982.5899.018.5475.6122.2778.9858.856108.95629108.6717.657.775
Percentage of AssetsFairValueDisclosure8.77.32.911.511.58.52.912.712.614.413.231.126.824.921.823.8

us-gaap:FairValueInputsLevel2


Assets
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302013-12-31
Value908986696560746161625979777664313029282725252625282727262624
Percentage of AssetsFairValueDisclosure91.392.797.188.588.591.597.187.387.485.686.883.181.382.168.971.472.272.373.272.972.272.575.176.579.177.078.277.778.176.2

us-gaap:AssetsFairValueDisclosure us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency

us-gaap:FairValueInputsLevel1, us-gaap:FairValueMeasurementsRecurring


Assets
Period End2020-12-312019-12-31
Value2.5892.277
Percentage of AssetsFairValueDisclosure2.92.9

us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring


Assets
Period End2020-12-312019-12-31
Value8674
Percentage of AssetsFairValueDisclosure97.197.1

us-gaap:AssetsFairValueDisclosure us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument

us-gaap:FairValueInputsLevel1, us-gaap:FairValueMeasurementsRecurring, it:PlanAssets


Assets
Period End2020-12-312019-12-31
Value2.5892.277
Percentage of AssetsFairValueDisclosure2.92.9

us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring, it:PlanAssets


Assets
Period End2020-12-312019-12-31
Value8573
Percentage of AssetsFairValueDisclosure96.195.0

us-gaap:AssetsFairValueDisclosure us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FinancialInstrument

us-gaap:FairValueInputsLevel2, it:PlanAssets


Assets
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302013-12-31
Value908985696559736161625756545959313029272625252525282727262624
Percentage of AssetsFairValueDisclosure91.392.796.188.588.491.295.087.287.385.484.958.957.363.563.171.272.172.272.872.872.172.573.376.479.077.076.977.778.175.8

us-gaap:AssetsFairValueDisclosure us-gaap:FairValueByMeasurementFrequency

us-gaap:FairValueMeasurementsRecurring


Assets
Period End2020-12-312019-12-312012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value8977393938232524
Percentage of AssetsFairValueDisclosure100.0100.00.00.0100.00.00.00.0

us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther us-gaap:BusinessAcquisition

us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther

it:PulseQAInc


Business
Period End2021-06-17
Value0.6
Percentage of BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther100.0

us-gaap:CapitalizedComputerSoftwareNet

us-gaap:CapitalizedComputerSoftwareNet


Capitalized
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value5855372616141414141314
Percentage of CapitalizedComputerSoftwareNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CashSurrenderValueOfLifeInsurance

us-gaap:CashSurrenderValueOfLifeInsurance


Cash
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value85735759272527241917
Percentage of CashSurrenderValueOfLifeInsurance100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ContractWithCustomerAssetGross

us-gaap:ContractWithCustomerAssetGross


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
Value2219142322192124112011861262986109111421162
Percentage of ContractWithCustomerAssetGross100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

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
Value218321142001173617821864195218181812185417661667170517351646
Percentage of ContractWithCustomerLiability100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ContractWithCustomerLiabilityNoncurrent

us-gaap:ContractWithCustomerLiabilityNoncurrent


Contract
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value312526261717241516172116171616
Percentage of ContractWithCustomerLiabilityNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DebtInstrumentCarryingAmount

us-gaap:DebtInstrumentCarryingAmount


Debt
Period End2021-06-302021-03-312020-12-312019-12-312018-12-312017-12-312017-03-312016-12-312016-09-302016-06-302015-12-31
Value2495199520062207231233001657702745835825
Percentage of DebtInstrumentCarryingAmount100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DebtInstrumentCarryingAmount us-gaap:CreditFacility, us-gaap:DebtInstrument, us-gaap:LongtermDebtType

us-gaap:RevolvingCreditFacility, it:A2020CreditAgreement, us-gaap:LineOfCredit


Debt
Period End2020-12-31
Value5.0
Percentage of DebtInstrumentCarryingAmount0.2

us-gaap:DebtInstrumentCarryingAmount us-gaap:DebtInstrument, us-gaap:LongtermDebtType

it:A2020CreditAgreement, it:TermLoanFacility


Debt
Period End2021-06-302021-03-312020-12-312020-09-30
Value290390395400
Percentage of DebtInstrumentCarryingAmount11.619.519.70.0

it:EconomicDevelopmentLoan1, it:ConnecticutEconomicDevelopmentProgram


Debt
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value0.91.01.21.31.41.51.71.81.9
Percentage of DebtInstrumentCarryingAmount0.00.00.00.00.00.10.00.00.0

it:SeniorNotesDue2028, us-gaap:SeniorNotes


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value8008008008008000.0
Percentage of DebtInstrumentCarryingAmount32.140.139.90.00.00.0

it:SeniorNotesDue2029, us-gaap:SeniorNotes


Debt
Period End2021-06-30
Value600
Percentage of DebtInstrumentCarryingAmount24.0

us-gaap:DebtInstrumentCarryingAmount us-gaap:LongtermDebtType

it:OtherLongTermDebt


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value5.795.9196.0466.1726.2976.4226.5456.6676.796.912.03
Percentage of DebtInstrumentCarryingAmount0.20.30.30.00.00.00.30.00.00.00.1

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

us-gaap:DebtInstrumentFairValue

it:SeniorNotesDue2028, us-gaap:FairValueInputsLevel2, us-gaap:SeniorNotes


Debt
Period End2021-06-302021-03-312020-12-31
Value846823846
Percentage of DebtInstrumentFairValue100.0100.0100.0

it:SeniorNotesDue2029, us-gaap:FairValueInputsLevel2, us-gaap:SeniorNotes


Debt
Period End2021-06-30
Value611
Percentage of DebtInstrumentFairValue72.3

it:SeniorNotesDue2030, us-gaap:FairValueInputsLevel2, us-gaap:SeniorNotes


Debt
Period End2021-06-302021-03-312020-12-31
Value819792843
Percentage of DebtInstrumentFairValue96.996.399.7

us-gaap:DebtInstrumentFairValue us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:LongtermDebtType

us-gaap:FairValueInputsLevel2, us-gaap:SeniorNotes


Debt
Period End2021-06-302021-03-312020-12-312019-12-31
Value227716151690835
Percentage of DebtInstrumentFairValue269.1196.3199.70.0

us-gaap:DebtIssuanceCostsLineOfCreditArrangementsNet

us-gaap:DebtIssuanceCostsLineOfCreditArrangementsNet


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-31
Value3226272831222325272830323342444649288.1098.595-8.9850.0
Percentage of DebtIssuanceCostsLineOfCreditArrangementsNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0

us-gaap:DebtLongtermAndShorttermCombinedAmount

us-gaap:DebtLongtermAndShorttermCombinedAmount


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302016-12-31
Value24631969197819771975218421832181218022992281217024302975327833413417694
Percentage of DebtLongtermAndShorttermCombinedAmount100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DecreaseInUnrecognizedTaxBenefitsIsReasonablyPossible

us-gaap:DecreaseInUnrecognizedTaxBenefitsIsReasonablyPossible


Decrease
Period End2021-06-302021-03-312020-09-30
Value9200000.08900000.09900000.0
Percentage of DecreaseInUnrecognizedTaxBenefitsIsReasonablyPossible100.0100.0100.0

us-gaap:DeferredCompensationLiabilityClassifiedNoncurrent us-gaap:BalanceSheetLocation

us-gaap:DeferredCompensationLiabilityClassifiedNoncurrent

us-gaap:OtherLiabilities


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-31
Value9479688943393936
Percentage of DeferredCompensationLiabilityClassifiedNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredCompensationPlanAssets us-gaap:BalanceSheetLocation

us-gaap:DeferredCompensationPlanAssets

us-gaap:OtherAssets


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-31
Value8875668838343432
Percentage of DeferredCompensationPlanAssets100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredIncomeTaxAssetsNet

us-gaap:DeferredIncomeTaxAssetsNet


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value10379343127
Percentage of DeferredIncomeTaxAssetsNet100.0100.0100.0100.0100.0

us-gaap:DeferredIncomeTaxAssetsNet us-gaap:BalanceSheetLocation

us-gaap:OtherAssets


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value10379343027
Percentage of DeferredIncomeTaxAssetsNet100.0100.0100.098.2100.1

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
Value241282320415961007059-42.624-36.406
Percentage of DeferredIncomeTaxLiabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredRevenueCurrent

us-gaap:DeferredRevenueCurrent


Deferred
Period End2020-12-312019-12-312018-12-312018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value19741928174516871719163015121449110998910281029986900925922895841847847832766754749736692682659650611598572558523437
Percentage of DeferredRevenueCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredRevenueNoncurrent

us-gaap:DeferredRevenueNoncurrent


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value26242116117.6037.0568.9595.5084.5724.659
Percentage of DeferredRevenueNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxAssetsGross

us-gaap:DeferredTaxAssetsGross


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value18717414419510210510395989181
Percentage of DeferredTaxAssetsGross100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxAssetsOther

us-gaap:DeferredTaxAssetsOther


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value162014306.6526.7123.421.3067.6138.9495.244
Percentage of DeferredTaxAssetsOther100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost

us-gaap:DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value1416192425221919181816
Percentage of DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxLiabilitiesGoodwillAndIntangibleAssets

us-gaap:DeferredTaxLiabilitiesGoodwillAndIntangibleAssets


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value17221221437243552925-23.129-17.024
Percentage of DeferredTaxLiabilitiesGoodwillAndIntangibleAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxLiabilitiesOther

us-gaap:DeferredTaxLiabilitiesOther


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-31
Value135.799616.5847.9257.2443.5910.0
Percentage of DeferredTaxLiabilitiesOther100.0100.0100.0100.0100.0100.0100.00.0

us-gaap:DeferredTaxLiabilitiesPrepaidExpenses

us-gaap:DeferredTaxLiabilitiesPrepaidExpenses


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value4649413532282622-10.5-10.183
Percentage of DeferredTaxLiabilitiesPrepaidExpenses100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DefinedBenefitPensionPlanLiabilitiesNoncurrent

us-gaap:DefinedBenefitPensionPlanLiabilitiesNoncurrent


Defined
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value1281089611867626458544744
Percentage of DefinedBenefitPensionPlanLiabilitiesNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesAfterTax

us-gaap:DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesAfterTax


Defined
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-31
Value-9309000.0-8584000.0-5738000.0-5861000.0-5797000.0-4832000.0
Percentage of DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesAfterTax100.0100.0100.0100.0100.0100.0

us-gaap:DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent

us-gaap:DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent


Defined
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value9884759745424342373836
Percentage of DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate

us-gaap:DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate


Defined
Period End2020-12-312019-12-312018-12-31
Value0.941.281.81
Percentage of DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate100.0100.0100.0

us-gaap:DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationWeightedAverageInterestCreditingRate

us-gaap:DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationWeightedAverageInterestCreditingRate


Defined
Period End2020-12-312019-12-312018-12-31
Value0.81.21.9
Percentage of DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationWeightedAverageInterestCreditingRate100.0100.0100.0

us-gaap:DefinedBenefitPlanBenefitObligation

us-gaap:DefinedBenefitPlanBenefitObligation


Defined
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-312008-12-31
Value62524445383538343121191413
Percentage of DefinedBenefitPlanBenefitObligation100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter


Defined
Period End2020-12-31
Value15
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter100.0

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths


Defined
Period End2020-12-31
Value1800000.0
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths100.0

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive


Defined
Period End2020-12-31
Value2500000.0
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive100.0

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour


Defined
Period End2020-12-31
Value2300000.0
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour100.0

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree


Defined
Period End2020-12-31
Value2300000.0
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree100.0

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo


Defined
Period End2020-12-31
Value1800000.0
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo100.0

us-gaap:DefinedBenefitPlanFairValueOfPlanAssets

us-gaap:DefinedBenefitPlanFairValueOfPlanAssets


Defined
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-31
Value282319181413
Percentage of DefinedBenefitPlanFairValueOfPlanAssets100.0100.0100.0100.0100.0100.0

us-gaap:DefinedBenefitPlanFundedStatusOfPlan

us-gaap:DefinedBenefitPlanFundedStatusOfPlan


Defined
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-31
Value-33661000.0-29059000.0-25430000.0-26975000.0-23935000.0-22680000.0
Percentage of DefinedBenefitPlanFundedStatusOfPlan100.0100.0100.0100.0100.0100.0

us-gaap:DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateAccumulatedBenefitObligation

us-gaap:DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateAccumulatedBenefitObligation


Defined
Period End2020-12-312019-12-312018-12-31
Value584942
Percentage of DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateAccumulatedBenefitObligation100.0100.0100.0

us-gaap:DerivativeAssetsLiabilitiesAtFairValueNet

us-gaap:DerivativeAssetsLiabilitiesAtFairValueNet


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value-80.179-85.026-110.689-120.637-128.774-126.876-64.772-80.453-65.042-30.972-12.6232221163.86-8.097-10.28-6.789-2.669-14.974-20.356-17.147-4.897-13.767-4.027-4.773-2.662-3.858-4.876-5.725-6.565-7.343-7.777-9.1-9.996-11.24-10.529-9.861-9.717-11.145-6.875-5.449
Percentage of DerivativeAssetsLiabilitiesAtFairValueNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

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

it:AccruedLiabilitiesCurrent, us-gaap:ForeignExchangeForward, us-gaap:Nondesignated


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302014-12-31
Value-0.138-0.22-1.514-0.105-0.061-0.559-0.22-0.451-0.354-1.942-0.434-0.401-0.495-0.088-0.101-0.159-0.32-0.067-0.093-0.1260.235-0.067-0.0090.238
Percentage of DerivativeAssetsLiabilitiesAtFairValueNet0.20.31.40.10.00.40.30.71.115.4-1.9-1.8-2.91.11.02.312.00.40.50.7-4.80.50.2-8.9

it:AccruedLiabilitiesCurrent, us-gaap:InterestRateSwap, us-gaap:DesignatedAsHedgingInstrument


Derivative
Period End2020-12-312020-09-302020-06-30
Value-34.886-34.706-34.538
Percentage of DerivativeAssetsLiabilitiesAtFairValueNet31.528.826.8

it:AccruedLiabilitiesCurrent, us-gaap:InterestRateSwap, us-gaap:Nondesignated


Derivative
Period End2021-06-302021-03-312020-12-31
Value-31.341-34.71-34.886
Percentage of DerivativeAssetsLiabilitiesAtFairValueNet39.140.831.5

us-gaap:OtherLiabilities, us-gaap:InterestRateSwap, us-gaap:DesignatedAsHedgingInstrument


Derivative
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302011-12-31
Value-74.289-85.826-94.175-126.317-64.831-80.233-64.591-30.618-10.681-8.009-10.179-6.63-2.349-14.907-20.263-17.021-5.132-13.7-4.018-4.74-2.9-3.839-4.87-5.72-6.505-7.291-7.725-9.08-10.0-11.0-10.56-9.891
Percentage of DerivativeAssetsLiabilitiesAtFairValueNet67.171.173.199.6100.199.799.398.984.698.999.097.788.099.699.599.3104.899.599.899.3108.999.599.999.999.199.399.399.8100.097.9100.3101.8

us-gaap:OtherLiabilities, us-gaap:InterestRateSwap, us-gaap:Nondesignated


Derivative
Period End2021-06-302021-03-312020-12-31
Value-48.7-50.096-74.289
Percentage of DerivativeAssetsLiabilitiesAtFairValueNet60.758.967.1

us-gaap:DerivativeLiabilitiesCurrent

us-gaap:DerivativeLiabilitiesCurrent


Derivative
Period End2020-12-31
Value34
Percentage of DerivativeLiabilitiesCurrent100.0

us-gaap:DerivativeNotionalAmount

us-gaap:DerivativeNotionalAmount


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302018-12-31
Value162215961830161115821627200416033027
Percentage of DerivativeNotionalAmount100.0100.0100.0100.0100.0100.0100.0100.0100.0

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

it:AccruedLiabilitiesCurrent, us-gaap:ForeignExchangeForward, us-gaap:Nondesignated


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-09-302018-12-31
Value222196430211182227203927
Percentage of DerivativeNotionalAmount13.712.323.513.111.514.012.730.6

us-gaap:OtherLiabilities, us-gaap:InterestRateSwap, us-gaap:DesignatedAsHedgingInstrument


Derivative
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302018-12-31
Value1400140014001400140014002100
Percentage of DerivativeNotionalAmount76.586.988.586.069.887.369.4

us-gaap:EmployeeRelatedLiabilitiesCurrent

us-gaap:EmployeeRelatedLiabilitiesCurrent


Employee
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value18916514312087857983716662
Percentage of EmployeeRelatedLiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized

us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized


Employee
Period End2020-12-31
Value84
Percentage of EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized100.0

us-gaap:FiniteLivedIntangibleAssetsAccumulatedAmortization

us-gaap:FiniteLivedIntangibleAssetsAccumulatedAmortization


Finite
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-31
Value449502472454423399376341311299350326289243190157109463934332721151412232119171514121110-8.9547.5786.6471615155.90810
Percentage of FiniteLivedIntangibleAssetsAccumulatedAmortization100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FiniteLivedIntangibleAssetsAccumulatedAmortization us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:ComputerSoftwareIntangibleAsset


Finite
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302011-12-31
Value3088837771666155504438423832262422108.9047.6176.284.9263.6992.2863.6263.0942.6032.1031.5581.321.1240.9390.7550.5320.407-0.222-0.407
Percentage of FiniteLivedIntangibleAssetsAccumulatedAmortization6.817.717.617.016.916.716.416.316.114.911.113.013.413.313.815.521.022.122.322.418.617.917.215.225.225.211.09.98.27.87.26.55.84.63.92.5-2.5

us-gaap:CustomerRelationships


Finite
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-31
Value41440638135132729928325523221018416214111992754719161414119.0286.4775.394.60511109.6198.7198.3727.7847.1266.5595.896-5.2384.5694.0563.6053.1552.7043.6051.777
Percentage of FiniteLivedIntangibleAssetsAccumulatedAmortization92.380.780.877.377.375.075.474.774.670.252.849.649.049.048.747.643.342.041.942.142.242.542.143.037.437.547.048.650.651.353.354.154.956.357.158.560.361.021.820.017.961.017.7

us-gaap:MediaContent


Finite
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-30
Value3.9653.5953.1772.75812119.9738.9227.877929179634736202.5212.0331.5734.4343.8683.5252.9412.6632.4042.2462.0411.8321.6071.3881.1610.9360.7130.497-0.2840.068
Percentage of FiniteLivedIntangibleAssetsAccumulatedAmortization0.80.80.70.73.13.02.92.92.626.528.027.426.224.923.418.95.45.14.613.214.116.419.518.519.69.59.69.69.58.88.17.26.14.83.20.9

us-gaap:OtherIntangibleAssets


Finite
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302016-12-31
Value4.253.9743.6972221211921203633302927242112
Percentage of FiniteLivedIntangibleAssetsAccumulatedAmortization0.90.80.85.05.15.35.36.26.512.39.69.410.311.412.713.630.7

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive


Finite
Period End2020-12-31
Value336
Percentage of FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive100.0

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths


Finite
Period End2021-06-302021-03-312020-12-312020-09-30
Value10196105104
Percentage of FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths100.0100.0100.0100.0

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear


Finite
Period End2021-06-302021-03-312020-09-30
Value527530
Percentage of FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear100.0100.0100.0

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearFive

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearFive


Finite
Period End2020-12-31
Value82
Percentage of FiniteLivedIntangibleAssetsAmortizationExpenseYearFive100.0

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearFour

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearFour


Finite
Period End2021-06-302021-03-312020-12-312020-09-30
Value84829088
Percentage of FiniteLivedIntangibleAssetsAmortizationExpenseYearFour100.0100.0100.0100.0

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearThree

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearThree


Finite
Period End2021-06-302021-03-312020-12-312020-09-30
Value94909694
Percentage of FiniteLivedIntangibleAssetsAmortizationExpenseYearThree100.0100.0100.0100.0

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo


Finite
Period End2021-06-302021-03-312020-12-312020-09-30
Value101969694
Percentage of FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo100.0100.0100.0100.0

us-gaap:FiniteLivedIntangibleAssetsGross

us-gaap:FiniteLivedIntangibleAssetsGross


Finite
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-31
Value122412801279127512701263130112781285131513921412146614901482172217041271161151321181181114140545455512122222221122323231223
Percentage of FiniteLivedIntangibleAssetsGross100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FiniteLivedIntangibleAssetsGross us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:ComputerSoftwareIntangibleAsset


Finite
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-03-312012-12-312012-09-302011-12-31
Value611101101091091091111101101101101201221231231981961716161616168.7477.2086.5186.5696.8537.1352.9432.1432.1242.1242.0892.124
Percentage of FiniteLivedIntangibleAssetsGross5.08.68.68.68.68.78.58.68.68.47.98.58.48.38.311.511.513.413.713.912.713.713.77.917.416.012.112.512.95.79.89.69.69.59.0

us-gaap:CustomerRelationships


Finite
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-31
Value115211551154113211271108114511211128114011311141118612081200132613147263627063626220202728282710101010107.217.217.217.217.217.21
Percentage of FiniteLivedIntangibleAssetsGross94.190.290.288.788.787.888.087.887.886.681.280.880.981.180.977.077.156.954.354.453.153.453.356.449.550.551.551.351.152.946.547.747.747.948.455.630.530.530.555.630.5

us-gaap:MediaContent


Finite
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-03-312012-12-312012-09-302012-06-30
Value3.9653.9653.9653.965131412121298991031041041491453.7653.7282.9119.7495.35.45163.4833.4523.563.623.7543.4963.4963.4473.4473.4043.269
Percentage of FiniteLivedIntangibleAssetsGross0.30.30.30.31.11.11.01.01.07.17.07.17.07.08.78.53.03.22.57.34.54.614.48.48.56.66.66.86.816.015.615.615.415.1

us-gaap:OtherIntangibleAssets


Finite
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302016-12-312015-12-31
Value101010292930303233515151545454483333
Percentage of FiniteLivedIntangibleAssetsGross0.90.80.82.42.42.42.42.62.63.93.73.73.73.73.72.828.828.4

us-gaap:InterestRateCashFlowHedgeGainLossToBeReclassifiedDuringNext12MonthsNet

us-gaap:InterestRateCashFlowHedgeGainLossToBeReclassifiedDuringNext12MonthsNet


Interest
Period End2020-12-31
Value-29100000.0
Percentage of InterestRateCashFlowHedgeGainLossToBeReclassifiedDuringNext12MonthsNet100.0

us-gaap:InterestRateFairValueHedgeDerivativeAtFairValueNet us-gaap:DerivativeInstrumentRisk

us-gaap:InterestRateFairValueHedgeDerivativeAtFairValueNet

us-gaap:InterestRateSwap


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-31
Value-80.0-84.8109-120.5-128.7-126.3-64.8-10.73.4-2.3-5.1-2.9
Percentage of InterestRateFairValueHedgeDerivativeAtFairValueNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InterestRateFairValueHedgeDerivativeAtFairValueNet us-gaap:DerivativeInstrumentRisk, us-gaap:StatementEquityComponents

us-gaap:InterestRateSwap, us-gaap:AccumulatedOtherComprehensiveIncome


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value-67.4-72.878-84.6-89.0-47.2
Percentage of InterestRateFairValueHedgeDerivativeAtFairValueNet84.285.871.570.269.272.8

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths


Lessee
Period End2020-12-31
Value138
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths100.0

us-gaap:LessorOperatingLeasePaymentsToBeReceived

us-gaap:LessorOperatingLeasePaymentsToBeReceived


Lessor
Period End2020-12-31
Value325
Percentage of LessorOperatingLeasePaymentsToBeReceived100.0

us-gaap:LessorOperatingLeasePaymentsToBeReceivedFiveYears

us-gaap:LessorOperatingLeasePaymentsToBeReceivedFiveYears


Lessor
Period End2020-12-31
Value40
Percentage of LessorOperatingLeasePaymentsToBeReceivedFiveYears100.0

us-gaap:LessorOperatingLeasePaymentsToBeReceivedFourYears

us-gaap:LessorOperatingLeasePaymentsToBeReceivedFourYears


Lessor
Period End2020-12-31
Value40
Percentage of LessorOperatingLeasePaymentsToBeReceivedFourYears100.0

us-gaap:LessorOperatingLeasePaymentsToBeReceivedNextTwelveMonths

us-gaap:LessorOperatingLeasePaymentsToBeReceivedNextTwelveMonths


Lessor
Period End2020-12-31
Value44
Percentage of LessorOperatingLeasePaymentsToBeReceivedNextTwelveMonths100.0

us-gaap:LessorOperatingLeasePaymentsToBeReceivedThereafter

us-gaap:LessorOperatingLeasePaymentsToBeReceivedThereafter


Lessor
Period End2020-12-31
Value102
Percentage of LessorOperatingLeasePaymentsToBeReceivedThereafter100.0

us-gaap:LessorOperatingLeasePaymentsToBeReceivedThreeYears

us-gaap:LessorOperatingLeasePaymentsToBeReceivedThreeYears


Lessor
Period End2020-12-31
Value48
Percentage of LessorOperatingLeasePaymentsToBeReceivedThreeYears100.0

us-gaap:LessorOperatingLeasePaymentsToBeReceivedTwoYears

us-gaap:LessorOperatingLeasePaymentsToBeReceivedTwoYears


Lessor
Period End2020-12-31
Value47
Percentage of LessorOperatingLeasePaymentsToBeReceivedTwoYears100.0

us-gaap:LiabilitiesFairValueDisclosure

us-gaap:LiabilitiesFairValueDisclosure


Liabilities
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-312016-12-312015-12-312014-12-312014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302011-12-31
Value186184206185518389839819939659118588819294544424343424042414138
Percentage of LiabilitiesFairValueDisclosure100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LiabilitiesFairValueDisclosure us-gaap:DebtInstrument, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FinancialInstrument, us-gaap:LongtermDebtType

it:SeniorNotesDue2028, us-gaap:FairValueInputsLevel2, us-gaap:Debt, us-gaap:SeniorNotes


Liabilities
Period End2020-09-302020-06-302019-12-31
Value8408090.0
Percentage of LiabilitiesFairValueDisclosure45.344.00.0

it:SeniorNotesDue2030, us-gaap:FairValueInputsLevel2, us-gaap:Debt, us-gaap:SeniorNotes


Liabilities
Period End2020-09-30
Value810
Percentage of LiabilitiesFairValueDisclosure43.7

us-gaap:LiabilitiesFairValueDisclosure us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:ForeignExchangeForward, us-gaap:FairValueInputsLevel2


Liabilities
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-31
Value0.1820.2612.3990.1760.1320.6991.4990.2850.5270.553.260.6540.7210.6511.6050.1520.1360.1980.485
Percentage of LiabilitiesFairValueDisclosure0.10.11.20.00.00.10.20.00.10.10.40.10.00.00.20.00.00.01.1

us-gaap:InterestRateSwap, us-gaap:FairValueInputsLevel2


Liabilities
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-312017-09-302017-06-302017-03-312016-12-31
Value808410912012812664806430100.08.009106.632.349
Percentage of LiabilitiesFairValueDisclosure42.946.053.06.57.012.86.68.16.73.41.20.00.00.00.05.1

us-gaap:LiabilitiesFairValueDisclosure us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency

us-gaap:ForeignExchangeForward, us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring


Liabilities
Period End2020-12-312019-12-31
Value2.3991.499
Percentage of LiabilitiesFairValueDisclosure1.20.2

us-gaap:InterestRateSwap, us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring


Liabilities
Period End2020-12-312019-12-31
Value10964
Percentage of LiabilitiesFairValueDisclosure53.06.6

us-gaap:LiabilitiesFairValueDisclosure us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:FairValueInputsLevel2


Liabilities
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302013-12-31
Value186184206185518389839819939659118588818728759299015752455761574451444542424343
Percentage of LiabilitiesFairValueDisclosure100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.0100.00.00.00.0100.00.00.00.0100.00.00.00.0100.00.00.0100.0

us-gaap:LiabilitiesFairValueDisclosure us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency

us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring


Liabilities
Period End2020-12-312019-12-31
Value206145
Percentage of LiabilitiesFairValueDisclosure100.014.9

us-gaap:LiabilitiesFairValueDisclosure us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument

us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring, it:PlanLiabilities


Liabilities
Period End2020-12-312019-12-31
Value9479
Percentage of LiabilitiesFairValueDisclosure45.98.1

us-gaap:LiabilitiesFairValueDisclosure us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FinancialInstrument

us-gaap:FairValueInputsLevel2, it:PlanLiabilities


Liabilities
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302013-12-31
Value1069994847867797474716874767389484745434240393937404039383836
Percentage of LiabilitiesFairValueDisclosure57.053.945.94.54.36.98.17.57.77.88.08.50.00.09.70.00.00.093.80.00.00.087.60.00.00.092.60.00.084.5

us-gaap:LiabilitiesFairValueDisclosure us-gaap:FairValueByMeasurementFrequency

us-gaap:FairValueMeasurementsRecurring


Liabilities
Period End2020-12-312019-12-312012-06-302012-03-312011-12-312010-12-31
Value20614539393832
Percentage of LiabilitiesFairValueDisclosure100.014.90.00.0100.00.0

us-gaap:LineOfCreditFacilityInterestRateAtPeriodEnd us-gaap:DebtInstrument, us-gaap:LongtermDebtType

us-gaap:LineOfCreditFacilityInterestRateAtPeriodEnd

it:A2020CreditAgreement, it:TermLoanFacility


Line
Period End2021-06-302021-03-312020-09-30
Value1.51.51.69
Percentage of LineOfCreditFacilityInterestRateAtPeriodEnd100.0100.0100.0

us-gaap:MoneyMarketFundsAtCarryingValue

us-gaap:MoneyMarketFundsAtCarryingValue


Money
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value2.62.39.029108.77.77.88.28.0
Percentage of MoneyMarketFundsAtCarryingValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingLeaseWeightedAverageDiscountRatePercent

us-gaap:OperatingLeaseWeightedAverageDiscountRatePercent


Operating
Period End2020-12-312019-12-31
Value6.66.7
Percentage of OperatingLeaseWeightedAverageDiscountRatePercent100.0100.0

us-gaap:OperatingLossCarryforwards it:Period, us-gaap:IncomeTaxAuthority

us-gaap:OperatingLossCarryforwards

it:CarriedForwardIndefinitely, us-gaap:ForeignCountry


Operating
Period End2020-12-312019-12-312018-12-312017-12-31
Value14274.915
Percentage of OperatingLossCarryforwards100.0100.0100.0100.0

it:ExpireOverNextTwentyYears, us-gaap:ForeignCountry


Operating
Period End2020-12-312019-12-312018-12-312017-12-31
Value0.10.40.10.5
Percentage of OperatingLossCarryforwards0.71.52.03.2

it:ExpireWithinSixToFifteenYears, us-gaap:StateAndLocalJurisdiction


Operating
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-31
Value0.10.33.5192.33.16.38799
Percentage of OperatingLossCarryforwards0.71.171.4128.40.00.00.00.00.0

it:ExpireWithinSixteenToTwentyYears, us-gaap:StateAndLocalJurisdiction


Operating
Period End2020-12-312019-12-312018-12-312017-12-312015-12-312014-12-312013-12-312012-12-31
Value7.92531702.00.81.15.8
Percentage of OperatingLossCarryforwards53.495.2644.9456.10.00.00.00.0

us-gaap:OperatingLossCarryforwards us-gaap:IncomeTaxAuthority

us-gaap:ForeignCountry


Operating
Period End2020-12-312019-12-312018-12-312017-12-312011-12-31
Value14275.01627
Percentage of OperatingLossCarryforwards100.7101.5102.0103.20.0

us-gaap:StateAndLocalJurisdiction


Operating
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value8.02635912.45.57.891108139
Percentage of OperatingLossCarryforwards54.196.7718.4590.30.00.00.00.00.00.0

us-gaap:OtherAssetsMiscellaneousNoncurrent

us-gaap:OtherAssetsMiscellaneousNoncurrent


Other
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value54584665145.9744.0014.513.3442.638
Percentage of OtherAssetsMiscellaneousNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherDeferredCostsNet

us-gaap:OtherDeferredCostsNet


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
Value24825725920723324026519721123123516618320720514314313914111211111812493981041158088971067777828765687578606571
Percentage of OtherDeferredCostsNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RestrictedCash

us-gaap:RestrictedCash


Restricted
Period End2021-06-30
Value4200000.0
Percentage of RestrictedCash100.0

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
Value3700360027002900300031003200290028002700270042122001060
Percentage of RevenueRemainingPerformanceObligation100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:SalesAndExciseTaxPayableCurrentAndNoncurrent

us-gaap:SalesAndExciseTaxPayableCurrentAndNoncurrent


Sales
Period End2020-12-312019-12-31
Value5831
Percentage of SalesAndExciseTaxPayableCurrentAndNoncurrent100.0100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber us-gaap:AwardType

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber

us-gaap:RestrictedStockUnitsRSU


Share
Period End2020-12-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302011-12-31
Value1.21.31.31.31.41.41.41.51.61.51.61.71.31.31.31.31.31.41.41.41.41.41.41.41.51.81.80.00181.92.52.52.53.1
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StockAppreciationRightsSARS


Share
Period End2020-12-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302011-12-31
Value1.01.21.31.31.41.21.21.41.51.21.31.31.61.31.41.41.71.31.51.51.71.41.51.82.01.62.02.02.32.02.12.42.5
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber83.392.3100.0100.0100.085.785.793.393.880.081.276.5123.1100.0107.7107.7130.892.9107.1107.1121.4100.0107.1128.6133.388.9111.1111111.1121.180.084.096.080.6

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber us-gaap:AwardType, us-gaap:PlanName

us-gaap:StockAppreciationRightsSARS, it:Unvested


Share
Period End2020-12-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302012-09-302012-06-30
Value0.50.70.60.60.70.70.70.70.70.70.70.70.80.80.80.80.80.80.80.80.90.81.01.01.21.1
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber41.753.846.246.250.050.050.046.743.846.743.841.261.561.561.561.561.557.157.157.164.357.166.755.648.044.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue us-gaap:AwardType

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue

it:CommonStockEquivalents


Share
Period End2020-12-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302011-12-31
Value28.826.9926.4826.0225.524.9624.5124.123.5923.1921.8221.4521.0920.7420.3920.0519.8119.5719.3419.118.8918.6518.4118.1817.9517.7117.4817240.017.0616.8916.6416.3915.93
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RestrictedStockUnitsRSU


Share
Period End2020-12-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302011-12-31
Value136.09118.89118.94118.89118.18101.75101.69101.67101.5291.4791.3791.5684.473.1973.1770.9972.5562.862.6562.5462.1850.7650.6750.6450.1538.8338.7438650.037.3727.9527.9327.9221.53
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue472.5440.5449.2456.9463.5407.7414.9421.9430.4394.4418.7426.9400.2352.9358.9354.1366.2320.9323.9327.4329.2272.2275.2278.5279.4219.3221.6224.2219.1165.5167.8170.3135.2

us-gaap:StockAppreciationRightsSARS


Share
Period End2020-12-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302011-12-31
Value27.7623.1822.4322.4322.4219.8819.7719.2919.1517.3517.3617.3617.0215.7715.615.5215.2414.9214.3414.3414.1313.2613.1712.3312.3111.6310.4610.4610.09.048.948.67.66
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue96.485.984.786.287.979.680.780.081.274.879.680.980.776.076.577.476.976.274.175.174.871.171.567.868.665.759.80.158.653.553.752.548.1

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant


Share
Period End2021-06-302021-03-312020-09-30
Value4200000.04000000.04300000.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant100.0100.0100.0

us-gaap:StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1

us-gaap:StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1


Stock
Period End2021-06-302021-03-312020-12-312020-09-30
Value300500600700
Percentage of StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1100.0100.0100.0100.0

us-gaap:StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1 us-gaap:SubsequentEventType

us-gaap:SubsequentEvent


Stock
Period End2021-07-312021-04-302021-01-31
Value231290568
Percentage of StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount10.00.00.0

us-gaap:TaxCreditCarryforwardAmount us-gaap:IncomeTaxAuthority

us-gaap:TaxCreditCarryforwardAmount

us-gaap:ForeignCountry


Tax
Period End2020-12-31
Value11
Percentage of TaxCreditCarryforwardAmount100.0

us-gaap:StateAndLocalJurisdiction


Tax
Period End2020-12-31
Value6.0
Percentage of TaxCreditCarryforwardAmount50.4

us-gaap:UndistributedEarningsOfForeignSubsidiaries

us-gaap:UndistributedEarningsOfForeignSubsidiaries


Undistributed
Period End2020-12-31
Value119
Percentage of UndistributedEarningsOfForeignSubsidiaries100.0

us-gaap:UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate

us-gaap:UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate


Unrecognized
Period End2020-12-31
Value118
Percentage of UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate100.0

us-gaap:ValuationAllowancesAndReservesBalance

us-gaap:ValuationAllowancesAndReservesBalance


Valuation
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value10.08.07.7127.46.96.77.06.47.267.28.1
Percentage of ValuationAllowancesAndReservesBalance100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

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:AllocatedShareBasedCompensationExpense
us-gaap:AwardType
(None,)
Allocated Share Based Compensation Expenseus-gaap: Award Type
us-gaap:AllocatedShareBasedCompensationExpense
us-gaap:IncomeStatementLocation
(None,)
Allocated Share Based Compensation Expenseus-gaap: Income Statement Location
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:OtherComprehensiveIncomeLossNetOfTax
us-gaap:StatementEquityComponents
(None,)
Other Comprehensive Income Loss Net Of Taxus-gaap: Statement Equity Components
us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax
us-gaap:StatementBusinessSegments
(None,)
Revenue From Contract With Customer Excluding Assessed Taxus-gaap: Statement Business Segments
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:ProductOrService
(None,)
Revenue From Contract With Customer Excluding Assessed Taxus-gaap: Product Or Service
us-gaap:Revenues
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
('us-gaap:OperatingSegments', None)
Revenuesus-gaap: Consolidation Items, us-gaap: Statement Business Segments
us-gaap:StockholdersEquity
us-gaap:StatementEquityComponents
(None,)
Stockholders Equityus-gaap: Statement Equity Components
us-gaap:NoncurrentAssets
us-gaap:StatementGeographical
(None,)
Noncurrent Assetsus-gaap: Statement Geographical
us-gaap:PropertyPlantAndEquipmentGross
us-gaap:PropertyPlantAndEquipmentByType
(None,)
Property Plant And Equipment Grossus-gaap: Property Plant And Equipment By Type
us-gaap:Goodwill
us-gaap:StatementBusinessSegments
(None,)
Goodwillus-gaap: Statement Business Segments
us-gaap:FiniteLivedIntangibleAssetsNet
us-gaap:FiniteLivedIntangibleAssetsByMajorClass
(None,)
Finite Lived Intangible Assets Netus-gaap: Finite Lived Intangible Assets By Major Class
us-gaap:LongTermDebt
us-gaap:DebtInstrument, us-gaap:LongtermDebtType
(None, 'us-gaap:SeniorNotes')
Long Term Debtus-gaap: Debt Instrument, us-gaap: Longterm Debt Type
us-gaap:StockholdersEquity
us-gaap:StatementEquityComponents
(None,)
Stockholders Equityus-gaap: Statement Equity Components