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<!-- DFIN New ActiveDisclosure (SM) XBRL Linkbase Document - http://www.dfinsolutions.com/ -->
<!-- Creation Date :2023-05-08T14:37:14.7326+00:00 -->
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_FixedRateOfThreePointZeroFivePercentBalloonDueMarchNineTwoThousandFiftyTwoMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Fixed rate of three point zero five percent balloon due March twenty two thousand fifty two.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ContractWithCustomerLiabilityIncreaseDecreaseForContractAcquiredInBusinessCombination_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Deferred revenue recognized from business acquisitions</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ContractWithCustomerLiabilityIncreaseDecreaseForContractAcquiredInBusinessCombination_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Contract with Customer, Liability, Increase (Decrease) for Contract Acquired in Business Combination</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Increase (Decrease) in Other Operating Assets and Liabilities, Net, Total</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Net change in other noncurrent assets and liabilities</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Increase (Decrease) in Other Operating Assets and Liabilities, Net</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DerivativeAssetNotionalAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Derivative Assets</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DerivativeAssetNotionalAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Derivative Asset, Notional Amount</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_UnbilledContractsReceivable_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Unbilled receivables</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_UnbilledContractsReceivable_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Unbilled Contracts Receivable</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PublicUtilitiesInventoryCoalMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Clean Coal Activities [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PublicUtilitiesInventoryCoalMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Coal [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_SecurityDepositMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Security Deposit [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_SecurityDepositMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Security Deposit [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_SecurityDepositMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Security Deposit [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_AmendmentFlag_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Amendment Flag</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_AmendmentFlag_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Amendment Flag</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_NumberOfEmployees_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Number of employees</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_NumberOfEmployees_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Number of employees.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_NumberOfEmployees_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Number Of Employees</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_NumberOfEmployees_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Number of employees will accommodate at new facility</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_AgeOfEmployeeNoLongerSubjectToAwardForfeitureOnConditionCompliance_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Minimum age of employee with not subject to award forfeiture on condition compliance</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_AgeOfEmployeeNoLongerSubjectToAwardForfeitureOnConditionCompliance_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Age Of Employee No Longer Subject To Award Forfeiture On Condition Compliance</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_AgeOfEmployeeNoLongerSubjectToAwardForfeitureOnConditionCompliance_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Age Of Employee No Longer Subject To Award Forfeiture On Condition Compliance</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Equity awards with an aggregate fair value</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax, Total</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel">Change in pension liability, net of taxes</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Net change in pension asset/liability, net of taxes</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_InsuranceBrokerageAndRiskManagementServicesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Brokerage and Risk Management [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_InsuranceBrokerageAndRiskManagementServicesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Insurance Brokerage And Risk Management Services [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_InsuranceBrokerageAndRiskManagementServicesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Insurance Brokerage And Risk Management Services [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Shares authorized</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShortTermBorrowings_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Short-Term Debt, Total</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShortTermBorrowings_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Corporate related borrowings - current</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShortTermBorrowings_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Short-Term Debt</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ExtinguishmentOfDebtAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Extinguishment of Debt</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ExtinguishmentOfDebtAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Extinguishment of Debt [Axis]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Accumulated amortization</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Finite-Lived Intangible Assets, Accumulated Amortization</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PaymentsForProceedsFromInvestments_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Payments for (Proceeds from) Investments, Total</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PaymentsForProceedsFromInvestments_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Net funding of investment transactions</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PaymentsForProceedsFromInvestments_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Payments for (Proceeds from) Investments</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_ExecutiveOfficerMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Executive Officer [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_ExecutiveOfficerMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Executive Officer [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_Goodwill_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Goodwill, Total</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_Goodwill_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Total goodwill</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_Goodwill_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Goodwill</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_Goodwill_lbl" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel">Beginning Balance</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_Goodwill_lbl" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel">Ending Balance</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_Goodwill_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Goodwill</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredIncomeTaxAssetsNet_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Deferred income taxes (includes tax credit carryforwards of $723.1 in 2023 and $772.7 in 2022)</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredIncomeTaxAssetsNet_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Deferred Income Tax Assets, Net</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingLeaseRightOfUseAsset_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Right-of-use assets</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingLeaseRightOfUseAsset_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Operating Lease, Right-of-Use Asset</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherCommitmentsAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Other Commitments</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherCommitmentsAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Other Commitments [Axis]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Major Classes of Amortizable Intangible Assets</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Schedule of Finite-Lived Intangible Assets [Table Text Block]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FiniteLivedTradeNamesGross_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Trade names</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FiniteLivedTradeNamesGross_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Finite-Lived Trade Names, Gross</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_FixedRateOfFivePointFiveZeroPercentBalloonDueMarchTwoTwoThousandThirtyThreeMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Fixed Rate of 5.50%, Balloon Due March 2, 2033 [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_FixedRateOfFivePointFiveZeroPercentBalloonDueMarchTwoTwoThousandThirtyThreeMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Fixed Rate of Five Point Five Zero Percent Balloon Due March Two Two Thousand Thirty Three [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_FixedRateOfFivePointFiveZeroPercentBalloonDueMarchTwoTwoThousandThirtyThreeMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Fixed rate of five point five zero percent balloon due march two two thousand thirty three.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_NzdDenominatedTrancheMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">NZD Denominated Tranche [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_NzdDenominatedTrancheMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Nzd Denominated Tranche [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_NzdDenominatedTrancheMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">NZD Denominated Tranche [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_DocumentQuarterlyReport_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Document Quarterly Report</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_DocumentQuarterlyReport_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Document Quarterly Report</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtInstrumentTable_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Debt Instrument [Table]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtInstrumentTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Schedule of Long-Term Debt Instruments [Table]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AccumulatedTranslationAdjustmentMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Foreign Currency Translation [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AccumulatedTranslationAdjustmentMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Accumulated Foreign Currency Adjustment Attributable to Parent [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_FixedRatesOfFourPointFourEightPercentBalloonDueJuneTwelveTwoThousandThirtyFourMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Fixed Rate of 4.48%, Balloon Due June 12, 2034 [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_FixedRatesOfFourPointFourEightPercentBalloonDueJuneTwelveTwoThousandThirtyFourMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Fixed Rates Of Four Point Four Eight Percent Balloon Due June Twelve Two Thousand Thirty Four [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_FixedRatesOfFourPointFourEightPercentBalloonDueJuneTwelveTwoThousandThirtyFourMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Fixed rates of four point four eight percent balloon due June twelve two thousand thirty four.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RecordedUnconditionalPurchaseObligationDueInThirdYear_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Contractual Obligations, Payments Due by Period, 2026</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RecordedUnconditionalPurchaseObligationDueInThirdYear_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Recorded Unconditional Purchase Obligation, to be Paid, Year Three</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_GainLossOnDerivativeInstrumentsNetPretax_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Realized a cash gain (loss) on hedging transaction</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_GainLossOnDerivativeInstrumentsNetPretax_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Gain (Loss) on Derivative Instruments, Net, Pretax</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_GainLossOnDerivativeInstrumentsNetPretax_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Gain (Loss) on Derivative Instruments, Net, Pretax, Total</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StatementTable_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Statement [Table]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StatementTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Statement [Table]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingLeaseLiabilityNoncurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Lease liabilities - noncurrent</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingLeaseLiabilityNoncurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Operating Lease, Liability, Noncurrent</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_PaymentsForProceedsFromSettlementsOfTerminatedInterestRateSwaps_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Settlements on terminated interest rate swaps</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_PaymentsForProceedsFromSettlementsOfTerminatedInterestRateSwaps_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Settlements on terminated interest rate swaps</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_PaymentsForProceedsFromSettlementsOfTerminatedInterestRateSwaps_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Payments For Proceeds From Settlements Of Terminated Interest Rate Swaps</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_PaymentsForProceedsFromSettlementsOfTerminatedInterestRateSwaps_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Payments for (proceeds from) settlements of terminated interest rate swaps.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_FixedRateOfFourPointThreeOnePercentBalloonDueJuneTwentyFourTwoThousandTwentyFiveMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Fixed Rate of 4.31%, Balloon Due June 24, 2025 [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_FixedRateOfFourPointThreeOnePercentBalloonDueJuneTwentyFourTwoThousandTwentyFiveMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Fixed Rate Of Four Point Three One Percent Balloon Due June Twenty Four Two Thousand Twenty Five [Member]</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_FixedRateOfFourPointZeroNinePercentBalloonDueJanuaryThirtyTwoThousandThirtyTwoMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Fixed Rate Of Four Point Zero Nine Percent Balloon Due January Thirty Two Thousand Thirty Two [Member]</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AccountingStandardsUpdate201912Member_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">ASU 2019-12 [Member]</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_ProductOrServiceAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Product and Service</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_ProductOrServiceAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Product and Service [Axis]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_OfficerMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Officer and Key Employees [Member]</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_TwoThousandTwentyThreeProvisionalCashAwardsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">2023 Provisional Cash Awards [Member]</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_TwoThousandTwentyThreeProvisionalCashAwardsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Two thousand twenty three provisional cash awards.</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_NotePurchaseAgreementMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Note Purchase Agreements [Member]</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_NotePurchaseAgreementMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Note Purchase Agreement [Member]</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_AmountOfCommitmentExpirationOffBalanceSheetCommitmentsWithinYearFour_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Amount of Commitment Expiration Off-Balance Sheet Commitments Within Year Four</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentAssets_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Assets</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockIssuedDuringPeriodSharesEmployeeBenefitPlan_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Stock Issued During Period, Shares, Employee Benefit Plan</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Foreign currency translation, net of taxes</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_MeasurementInputDiscountRateMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Measurement Input, Discount Rate [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_MeasurementInputDiscountRateMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Measurement Input, Discount Rate [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityIncorporationStateCountryCode_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Entity Incorporation, State or Country Code</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityIncorporationStateCountryCode_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Entity Incorporation, State or Country Code</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncomeStatementAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Income Statement [Abstract]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_BusinessCombinationAggregateEarnoutObligationExpectedSettlementInCash_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Aggregate amount of earnout obligation expected settlement in cash</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_BusinessCombinationAggregateEarnoutObligationExpectedSettlementInCash_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Business Combination Aggregate Earnout Obligation Expected Settlement In Cash</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_BusinessCombinationAggregateEarnoutObligationExpectedSettlementInCash_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Business combination aggregate earnout obligation expected settlement in cash.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingSegmentsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Operating Segments [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingSegmentsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Operating Segments [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_ScheduleOfBusinessAcquisitionAcquisitionOfAssetsTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Summary of Estimated Fair Values of Net Assets Acquired</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_ScheduleOfBusinessAcquisitionAcquisitionOfAssetsTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Schedule Of Business Acquisition Acquisition Of Assets Table [Text Block]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_ScheduleOfBusinessAcquisitionAcquisitionOfAssetsTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Schedule Of Business Acquisition, Acquisition of assets [Text Block]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LaborAndRelatedExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Compensation</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LaborAndRelatedExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Labor and Related Expense</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Range of Exercise Prices, maximum</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Payment Arrangement, Option, Exercise Price Range, Upper Range Limit</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LiabilitiesCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Total current liabilities</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LiabilitiesCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Total current liabilities</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LiabilitiesCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Liabilities, Current</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_NatureOfOperationsAndBasisOfPresentationPolicyPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Nature of Operations and Basis of Presentation</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_NatureOfOperationsAndBasisOfPresentationPolicyPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Nature Of Operations And Basis Of Presentation Policy Policy [Text Block]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_NatureOfOperationsAndBasisOfPresentationPolicyPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Nature Of Operations And Basis Of Presentation Policy Policy [Text Block]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_PeriodForOptionsToExpireFromDateOfGrant_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Maximum period for the exercise of stock options, years</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_PeriodForOptionsToExpireFromDateOfGrant_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Period For Options To Expire From Date Of Grant</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_PeriodForOptionsToExpireFromDateOfGrant_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Period for options to expire from date of grant.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_FixedRateOfFourPointThreeFourPercentBalloonDueJuneTwentySevenTwoThousandThirtyTwoMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Fixed Rate of 4.34%, Balloon Due June 27, 2032 [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_FixedRateOfFourPointThreeFourPercentBalloonDueJuneTwentySevenTwoThousandThirtyTwoMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Fixed Rate Of Four Point Three Four Percent Balloon Due June Twenty Seven Two Thousand Thirty Two [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_FixedRateOfFourPointThreeFourPercentBalloonDueJuneTwentySevenTwoThousandThirtyTwoMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Fixed rate of four point three four percent, balloon due June twenty seven, two thousand thirty two.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingValue_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Share-based compensation, shares outstanding, Value</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingValue_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Value</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingValue_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Value</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_BusinessCombinationConsiderationToSellerFundedExpensesAndNetWorkingCapital_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Net of agreed seller funded expenses and net working capital</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_BusinessCombinationConsiderationToSellerFundedExpensesAndNetWorkingCapital_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Business Combination Consideration To Seller Funded Expenses And Net Working Capital</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_BusinessCombinationConsiderationToSellerFundedExpensesAndNetWorkingCapital_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Business combination consideration to seller funded expenses and net working capital.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Employee stock purchase plan</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Stock Issued During Period, Value, Employee Stock Purchase Plan</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodExercisePercentageYearOne_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Stock options granted, exercise percentage, on the third anniversary date of the grant</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodExercisePercentageYearOne_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Exercise Percentage Year One</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodExercisePercentageYearOne_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Share based compensation arrangement by share based payment award options grants in period exercise percentage year one.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_FixedRateOfFourPointTwoFourPercentBalloonDueJanuaryThirtyTwoThousandThirtyFiveMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Fixed Rate of 4.24%, Balloon Due January 30, 2035 [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_FixedRateOfFourPointTwoFourPercentBalloonDueJanuaryThirtyTwoThousandThirtyFiveMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Fixed Rate Of Four Point Two Four Percent Balloon Due January Thirty Two Thousand Thirty Five [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_FixedRateOfFourPointTwoFourPercentBalloonDueJanuaryThirtyTwoThousandThirtyFiveMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Fixed Rate Of Four Point Two Four Percent Balloon Due January Thirty Two Thousand Thirty Five [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest, Total</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Comprehensive earnings attributable to noncontrolling interests</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessAcquisitionAcquireeDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Business Acquisition, Acquiree</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessAcquisitionAcquireeDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Business Acquisition, Acquiree [Domain]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InterestExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Interest Expense, Total</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InterestExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Interest</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InterestExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Interest Expense</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationAwardTrancheTwoMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Tranche Two [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationAwardTrancheTwoMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Payment Arrangement, Tranche Two [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_TradeNamesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Trade Names [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_TradeNamesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Trade Names [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_Range01Member_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Exercise Prices Range $ 55.94 - $ 56.86 [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_Range01Member_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Range01 [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_Range01Member_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Range 01 [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_DebtInstrumentMaturityYear_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Debt Instrument Maturity Year</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_DebtInstrumentMaturityYear_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Debt Instrument Maturity Year</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_DebtInstrumentMaturityYear_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Periodic payments of interest and principal, expiry year</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_DebtInstrumentMaturityYear_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Debt instrument, due date</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_PeriodOfServiceFromGrantDateStockOptionsAwardedNotSubjectToForfeiture_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Period of service from grant date stock options awarded not subject to forfeiture</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_PeriodOfServiceFromGrantDateStockOptionsAwardedNotSubjectToForfeiture_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Period Of Service From Grant Date Stock Options Awarded Not Subject To Forfeiture</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_PeriodOfServiceFromGrantDateStockOptionsAwardedNotSubjectToForfeiture_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Period Of Service From Grant Date Stock Options Awarded Not Subject To Forfeiture</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncreaseDecreaseInContractWithCustomerLiability_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Net change in deferred revenue</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncreaseDecreaseInContractWithCustomerLiability_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Increase (Decrease) in Contract with Customer, Liability</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LongTermPurchaseCommitmentCategoryOfItemPurchasedDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Long-term Purchase Commitment, Category of Item Purchased</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LongTermPurchaseCommitmentCategoryOfItemPurchasedDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Long-Term Purchase Commitment, Category of Item Purchased [Domain]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherNoncurrentAssetsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Other noncurrent Assets [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherNoncurrentAssetsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Other Noncurrent Assets [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_NetBorrowingsPaymentsOnPremiumFinancingDebtFacility_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Net borrowings on premium financing debt facility</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_NetBorrowingsPaymentsOnPremiumFinancingDebtFacility_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Net Borrowings Payments On Premium Financing Debt Facility</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_NetBorrowingsPaymentsOnPremiumFinancingDebtFacility_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Net borrowings (payments) on premium financing debt facility.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_EquityMethodInvesteeNameDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Investment, Name</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_EquityMethodInvesteeNameDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Investment, Name [Domain]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_Range07Member_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Exercise Prices Range $ 158.56 - $ 177.09 [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_Range07Member_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Range07 [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_Range07Member_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Range 07 [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_InvestmentsAndEmployeeDeferredCompensationPlanTable_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Investments And Employee Deferred Compensation Plan [Table]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_InvestmentsAndEmployeeDeferredCompensationPlanTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Investments And Employee Deferred Compensation Plan [Table]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_InvestmentsAndEmployeeDeferredCompensationPlanTable_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Investments And Employee Deferred Compensation Plan [Table]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntitySmallBusiness_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Entity Small Business</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntitySmallBusiness_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Entity Small Business</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NumberOfReportableSegments_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Number of reportable segments</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NumberOfReportableSegments_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Number of Reportable Segments</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Total cash and cash equivalents</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_lbl" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel">Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Ending Balance</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_lbl" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel">Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Beginning Balance</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SupplementaryInsuranceInformationOtherPolicyClaimsAndBenefitsPayable_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Insurance claim arise during ordinary course of business</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SupplementaryInsuranceInformationOtherPolicyClaimsAndBenefitsPayable_lbl" xlink:role="http://www.xbrl.org/2003/role/label">SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information, Other Policy Claim and Benefit Payable</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_CommitmentsContingenciesAndOffBalanceSheetArrangementsLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_CommitmentsContingenciesAndOffBalanceSheetArrangementsLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_CommitmentsContingenciesAndOffBalanceSheetArrangementsLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_CashAwardsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Cash Awards [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_CashAwardsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cash Awards [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_CashAwardsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Cash Awards [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InvestmentTypeCategorizationMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Investments</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Finite-Lived Intangible Assets Amortization Expense [Table Text Block]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_Range03Member_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Exercise Prices Range $ 79.59 - $ 79.59 [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_Range03Member_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Range03 [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_Range03Member_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Range 03 [Member]</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PaymentsToMinorityShareholders_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Payments to Noncontrolling Interests</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsByGeographicalAreasTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Summary of Geographical Location and Segment</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsByGeographicalAreasTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas [Table Text Block]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AssetsCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Total current assets</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ContractWithCustomerAssetAndLiabilityTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Summary of Unbilled Receivables, Contract Assets and Contract Liabilities from Contracts with Customers</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ContractWithCustomerAssetAndLiabilityTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_BusinessCombinationAggregateEarnoutObligationMaximum_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Aggregate amount of maximum earnout obligations related to acquisitions</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_BusinessCombinationAggregateEarnoutObligationMaximum_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Business Combination Aggregate Earnout Obligation Maximum</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_BusinessCombinationAggregateEarnoutObligationMaximum_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Business Combination ,Aggregate Earnout Obligation, Maximum</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Weighted Average Number of Shares Outstanding, Basic, Total</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Weighted average number of common shares outstanding</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Weighted Average Number of Shares Outstanding, Basic</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_CityAreaCode_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">City Area Code</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_CityAreaCode_lbl" xlink:role="http://www.xbrl.org/2003/role/label">City Area Code</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfDebtTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Summary of Corporate and Other Debt</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfDebtTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Schedule of Debt [Table Text Block]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_NumberOfCountriesInWhichCompanyDoesBusinessThroughNetworkOfCorrespondentBrokersAndConsultants_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Number of countries in which the company does business through a network of correspondent brokers and consultants</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_NumberOfCountriesInWhichCompanyDoesBusinessThroughNetworkOfCorrespondentBrokersAndConsultants_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Number Of Countries In Which Company Does Business Through Network Of Correspondent Brokers And Consultants</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_NumberOfCountriesInWhichCompanyDoesBusinessThroughNetworkOfCorrespondentBrokersAndConsultants_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Number of Countries in which the Company does Business through a Network of Correspondent Brokers and Consultants</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_InvestmentsAndEmployeeDeferredCompensationPlanLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Investments And Employee Deferred Compensation Plan [Line Items]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_InvestmentsAndEmployeeDeferredCompensationPlanLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Investments And Employee Deferred Compensation Plan [Line Items]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_InvestmentsAndEmployeeDeferredCompensationPlanLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Investments And Employee Deferred Compensation Plan [Line Items]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsAdditionalDisclosuresAcquisitionCostExpensed_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Accretion of the discount on acquisition</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsAdditionalDisclosuresAcquisitionCostExpensed_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Business Combination, Separately Recognized Transactions, Additional Disclosures, Acquisition Cost Expensed</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Shares Under Option, Forfeited or canceled</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Forfeitures in Period</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ComprehensiveIncomeNoteTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Accumulated Other Comprehensive Loss</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ComprehensiveIncomeNoteTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Comprehensive Income (Loss) Note [Text Block]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Payment Arrangement [Abstract]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_AccruedCompensationAndOtherCurrentLiabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Accrued compensation and other current liabilities</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_AccruedCompensationAndOtherCurrentLiabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Accrued Compensation and Other Current Liabilities</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_AccruedCompensationAndOtherCurrentLiabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Accrued compensation and other current liabilities.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InterestRateContractMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Interest Rate Contracts [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InterestRateContractMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Interest Rate Contract [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_InterestOnDebtMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Interest On Debt [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_InterestOnDebtMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Interest On Debt [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_InterestOnDebtMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Interest On Debt [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_AUDDenominatedTrancheMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">AUD Denominated Tranche [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_AUDDenominatedTrancheMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">A U D Denominated Tranche [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_AUDDenominatedTrancheMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">AUD Denominated Tranche.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_Liabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Total liabilities</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_Liabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Total liabilities</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_Liabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Liabilities</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_PremiumFinancingDebtFacilityMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Premium Financing Debt Facility [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_PremiumFinancingDebtFacilityMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Premium Financing Debt Facility [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_PremiumFinancingDebtFacilityMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Premium Financing Debt Facility [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_DocumentPeriodEndDate_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Document Period End Date</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_DocumentPeriodEndDate_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Document Period End Date</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_AmortizationOfDeferredCompensationAndRestrictedStock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Amortization of deferred compensation and restricted stock</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_AmortizationOfDeferredCompensationAndRestrictedStock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Amortization Of Deferred Compensation And Restricted Stock</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_AmortizationOfDeferredCompensationAndRestrictedStock_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Amortization of deferred compensation and restricted stock</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="country_AU_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Australia [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="country_AU_lbl" xlink:role="http://www.xbrl.org/2003/role/label">AUSTRALIA</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Schedule Of Finite Lived Intangible Assets [Table]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Schedule of Finite-Lived Intangible Assets [Table]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_StockIssuedDuringPeriodSharesDeferredCompensationAndRestrictedStock_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Deferred compensation and restricted (in shares)</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_StockIssuedDuringPeriodSharesDeferredCompensationAndRestrictedStock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Stock Issued During Period Shares Deferred Compensation And Restricted Stock</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_StockIssuedDuringPeriodSharesDeferredCompensationAndRestrictedStock_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Stock issued during period, shares, deferred compensation and restricted stock.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ProductAndServiceOtherMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Product and Service, Other [Member]</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">New Accounting Pronouncements Or Change In Accounting Principle [Line Items]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label">New Accounting Pronouncements or Change in Accounting Principle [Line Items]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Weighted average fair value per option for all options</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfSegmentReportingInformationBySegmentTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Schedule of Segment Reporting Information by Segment</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfSegmentReportingInformationBySegmentTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Schedule of Segment Reporting Information, by Segment [Table Text Block]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationAwardTrancheOneMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Tranche One [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationAwardTrancheOneMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Payment Arrangement, Tranche One [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">2024</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Finite-Lived Intangible Asset, Expected Amortization, Year One</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_RangeAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Statistical Measurement</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_CostReimbursements_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Cost reimbursements.</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_UpToFourPointFiveMillionMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Up to four point five million.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_DefinedBenefitPlanPercentageOfEligibleCompensationForMatchingContributionsByEmployer_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Percentage of eligible compensation for matching contributions by employer</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_DefinedBenefitPlanPercentageOfEligibleCompensationForMatchingContributionsByEmployer_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Defined Benefit Plan Percentage Of Eligible Compensation For Matching Contributions By Employer</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_DefinedBenefitPlanPercentageOfEligibleCompensationForMatchingContributionsByEmployer_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Defined benefit plan percentage of eligible compensation for matching contributions by employer.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_MAndTInsuranceAgencyMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">M &amp; T Insurance Agency.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_MAndTInsuranceAgencyMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">M And T Insurance Agency [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_MAndTInsuranceAgencyMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">M&amp;T Insurance Agency [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_MinorityInterest_lbl" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel">Stockholders' Equity Attributable to Noncontrolling Interest, Ending Balance</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_MinorityInterest_lbl" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel">Stockholders' Equity Attributable to Noncontrolling Interest, Beginning Balance</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_MinorityInterest_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Stockholders' Equity Attributable to Noncontrolling Interest, Total</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_MinorityInterest_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Stockholders' equity attributable to noncontrolling interests</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_MinorityInterest_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Stockholders' Equity Attributable to Noncontrolling Interest</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_Assets_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Identifiable assets at March 31, 2023 and 2022</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_Assets_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Total assets</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_Assets_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Total assets</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_Assets_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Assets</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_ProvisionalCompensationCashAwardApprovedForFutureGrantByCompensationCommitteeValue_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Provisional compensation cash awards approved for future grant by compensation committee, value</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_ProvisionalCompensationCashAwardApprovedForFutureGrantByCompensationCommitteeValue_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Provisional Compensation Cash Award Approved For Future Grant By Compensation Committee Value</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_ProvisionalCompensationCashAwardApprovedForFutureGrantByCompensationCommitteeValue_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Provisional Compensation Cash Award Approved for Future Grant by Compensation Committee, Value</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DerivativeContractTypeDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Derivative Contract</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DerivativeContractTypeDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Derivative Contract [Domain]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_TwoThousandSeventeenPerformanceShareAwardsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">2017 Performance Share Awards [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_TwoThousandSeventeenPerformanceShareAwardsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Two Thousand Seventeen Performance Share Awards [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_TwoThousandSeventeenPerformanceShareAwardsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Two Thousand Seventeen Performance Share Awards [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FiniteLivedNoncompeteAgreementsGross_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Non-compete agreements</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FiniteLivedNoncompeteAgreementsGross_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Finite-Lived Noncompete Agreements, Gross</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_ScenarioPreviouslyReportedMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Reported 2022</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_ScenarioPreviouslyReportedMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Previously Reported [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_FiduciaryLiabilitiesCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Fiduciary liabilities</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_FiduciaryLiabilitiesCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Fiduciary liabilities current</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_FiduciaryLiabilitiesCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Fiduciary liabilities current.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DerivativeTermOfContract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Derivative instrument, term</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DerivativeTermOfContract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Derivative, Term of Contract</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LongTermDebtNoncurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Long-Term Debt, Excluding Current Maturities, Total</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LongTermDebtNoncurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Corporate related borrowings - noncurrent</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LongTermDebtNoncurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Long-Term Debt, Excluding Current Maturities</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EarningsPerShareDiluted_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Earnings Per Share, Diluted, Total</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EarningsPerShareDiluted_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Diluted net earnings per share</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EarningsPerShareDiluted_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Earnings Per Share, Diluted</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RetirementPlanTypeAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Retirement Plan Type</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RetirementPlanTypeAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Retirement Plan Type [Axis]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_FixedRateOfFourPointThreeFourPercentBalloonDueAugustTwoTwoThousandThirtyTwoMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Fixed Rate of 4.34%, Balloon Due August 2, 2032 [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_FixedRateOfFourPointThreeFourPercentBalloonDueAugustTwoTwoThousandThirtyTwoMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Fixed Rate Of Four Point Three Four Percent Balloon Due August Two Two Thousand Thirty Two [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_FixedRateOfFourPointThreeFourPercentBalloonDueAugustTwoTwoThousandThirtyTwoMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Fixed rate of four point three four percent, balloon due August two, two thousand thirty two.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Summary of Expected Revenue Related to Performance Obligations</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table Text Block]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinancialGuaranteeMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Financial Guarantees [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinancialGuaranteeMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Financial Guarantee [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CashAndCashEquivalentsAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cash and Cash Equivalents [Abstract]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_FixedRateOfFourPointZeroNinePercentBalloonDueJuneTwentySevenTwoThousandTwentySevenMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Fixed Rate of 4.09%, Balloon Due June 27, 2027 [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_FixedRateOfFourPointZeroNinePercentBalloonDueJuneTwentySevenTwoThousandTwentySevenMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Fixed Rate Of Four Point Zero Nine Percent Balloon Due June Twenty Seven Two Thousand Twenty Seven [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_FixedRateOfFourPointZeroNinePercentBalloonDueJuneTwentySevenTwoThousandTwentySevenMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Fixed rate of four point zero nine percent, balloon due June twenty seven, two thousand twenty seven.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredCostsCapitalizedPrepaidAndOtherAssetsDisclosureAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityAddressPostalZipCode_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Entity Address, Postal Zip Code</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityAddressPostalZipCode_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Entity Address, Postal Zip Code</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_IncreaseDecreaseInPremiumsAndFeeReceivable_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Net change in premiums and fees receivable</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_IncreaseDecreaseInPremiumsAndFeeReceivable_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Increase Decrease In Premiums And Fee Receivable</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_IncreaseDecreaseInPremiumsAndFeeReceivable_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Increase (Decrease) in Premiums And Fee Receivable</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_TwoThousandTwentyTwoAcquisitionsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">2022 Acquisitions [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_TwoThousandTwentyTwoAcquisitionsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Two Thousand Twenty Two Acquisitions [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_TwoThousandTwentyTwoAcquisitionsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Two thousand twenty two acquisitions.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_BlackScholesOptionPricingModelMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Black-Scholes Option Pricing Model [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_BlackScholesOptionPricingModelMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Black Scholes Option Pricing Model [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_BlackScholesOptionPricingModelMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Black-Scholes Option Pricing Model [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_RestatementAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Revision of Prior Period [Axis]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_DocumentFiscalPeriodFocus_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Document Fiscal Period Focus</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_DocumentFiscalPeriodFocus_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Document Fiscal Period Focus</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_ChangeInPresentationOfFiduciaryAssetsAndLiabilitiesPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Change in Presentation of Fiduciary Assets and Liabilities</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_ChangeInPresentationOfFiduciaryAssetsAndLiabilitiesPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Change in Presentation of Fiduciary Assets and Liabilities [Policy Text Block]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_ChangeInPresentationOfFiduciaryAssetsAndLiabilitiesPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Change in presentation of fiduciary assets and liabilities.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CostOfGoodsAndServicesSold_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Cost of Goods and Services Sold, Total</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CostOfGoodsAndServicesSold_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Cost of revenues from clean coal activities</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CostOfGoodsAndServicesSold_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cost of Goods and Services Sold</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CostOfGoodsAndServicesSold_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Cost of revenues from clean coal activities</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RecordedUnconditionalPurchaseObligationDueInFourthYear_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Contractual Obligations, Payments Due by Period, 2027</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RecordedUnconditionalPurchaseObligationDueInFourthYear_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Recorded Unconditional Purchase Obligation, to be Paid, Year Four</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_BusinessCombinationAggregateEarnoutObligationExpectedSettlementInCashOrStockAtOption_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Aggregate amount of earnout obligation expected settlement in cash or stock at option</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_BusinessCombinationAggregateEarnoutObligationExpectedSettlementInCashOrStockAtOption_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Business Combination Aggregate Earnout Obligation Expected Settlement In Cash Or Stock At Option</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_BusinessCombinationAggregateEarnoutObligationExpectedSettlementInCashOrStockAtOption_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Business combination aggregate earnout obligation expected settlement in cash or stock at option.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncreaseDecreaseInAccountsReceivable_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Net change in accounts receivable, net</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncreaseDecreaseInAccountsReceivable_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Increase (Decrease) in Accounts Receivable</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OptionIndexedToIssuersEquityTypeAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Option Indexed to Issuer's Equity, Type</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OptionIndexedToIssuersEquityTypeAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Option Indexed to Issuer's Equity, Type [Axis]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Dilutive effect of stock options using the treasury stock method</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Incremental Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangements</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_ScheduleOfSaleOfSubsidiaryAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Schedule Of Sale Of Subsidiary [Abstract]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_ScheduleOfSaleOfSubsidiaryAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Schedule Of Sale Of Subsidiary [Abstract]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_FairValueInputsAttritionRate_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Attrition rate</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_FairValueInputsAttritionRate_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Fair Value Inputs Attrition Rate</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_FairValueInputsAttritionRate_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Fair Value Inputs, Attrition Rate</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_InterbankRatePlusZeroPointNineNineZeroPercentExpiresSeptemberFifteenTwoThousandTwentyFourMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Interbank rate plus zero point nine nine zero percent expires September fifteen two thousand twenty four.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_InterbankRatePlusZeroPointNineNineZeroPercentExpiresSeptemberFifteenTwoThousandTwentyFourMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Interbank Rate Plus Zero Point Nine Nine Zero Percent Expires September Fifteen Two Thousand Twenty Four [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_InterbankRatePlusZeroPointNineNineZeroPercentExpiresSeptemberFifteenTwoThousandTwentyFourMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Interbank Rates Plus 0.990% Expires September 15, 2024 [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_DeferredEquityParticipationSubPlanDistributionsToKeyExecutivesAge_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Deferred Equity Participation Sub-plans, distributions to key executives, age</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Weighted Average Remaining Contractual Term (in years), Exercisable at end of year</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ProceedsFromIssuanceOfCommonStock_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Net cash raised through follow-on common stock offering</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ProceedsFromIssuanceOfCommonStock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Proceeds from issuance of common stock</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ProceedsFromIssuanceOfCommonStock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Proceeds from Issuance of Common Stock</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LongtermDebtTypeAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Long-term Debt, Type</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LongtermDebtTypeAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Long-Term Debt, Type [Axis]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_InterbankRatesExpiresSeptemberFifteenTwoThousandTwentyThreeMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Interbank Rates Expires September 15, 2023 [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_InterbankRatesExpiresSeptemberFifteenTwoThousandTwentyThreeMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Interbank Rates Expires September Fifteen Two Thousand Twenty Three [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_InterbankRatesExpiresSeptemberFifteenTwoThousandTwentyThreeMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Interbank rates expires September fifteen two thousand twenty three.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_FixedRateOfFourPointSixNinePercentBalloonDueJuneThirteenTwoThousandThirtyEightMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Fixed Rate of 4.69%, Balloon Due June 13, 2038 [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_FixedRateOfFourPointSixNinePercentBalloonDueJuneThirteenTwoThousandThirtyEightMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Fixed Rate Of Four Point Six Nine Percent Balloon Due June Thirteen Two Thousand Thirty Eight [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_FixedRateOfFourPointSixNinePercentBalloonDueJuneThirteenTwoThousandThirtyEightMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Fixed rate of four point six nine percent balloon due June thirteen two thousand thirty eight.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredIncomeTaxExpenseBenefit_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Deferred Income Tax Expense (Benefit), Total</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredIncomeTaxExpenseBenefit_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Provision for deferred income taxes</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredIncomeTaxExpenseBenefit_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Deferred Income Tax Expense (Benefit)</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_MatchingContributionsVestingSchedule_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Matching contributions vesting schedule</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_MatchingContributionsVestingSchedule_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Matching Contributions Vesting Schedule</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_MatchingContributionsVestingSchedule_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Matching contributions vesting schedule.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_FixedRateOfFourPointSevenThreePercentBalloonDueFebruaryTwentySevenTwoThousandTwentySixMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Fixed Rate of 4.73%, Balloon Due February 27, 2026 [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_FixedRateOfFourPointSevenThreePercentBalloonDueFebruaryTwentySevenTwoThousandTwentySixMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Fixed Rate Of Four Point Seven Three Percent Balloon Due February Twenty Seven Two Thousand Twenty Six [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_FixedRateOfFourPointSevenThreePercentBalloonDueFebruaryTwentySevenTwoThousandTwentySixMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Fixed rate of four point seven three, percent balloon due February twenty seven, two thousand twenty six.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RevenueFromContractWithCustomerTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Contracts with Customers</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RevenueFromContractWithCustomerTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Revenue from Contract with Customer [Text Block]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncreaseDecreaseInReinsurancePayables_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Net change in premiums payable to underwriting enterprises</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncreaseDecreaseInReinsurancePayables_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Increase (Decrease) in Reinsurance Payables</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_AnnualActivityOfStockOptionPlansTable_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Annual Activity Of Stock Option Plans [Table]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_AnnualActivityOfStockOptionPlansTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Annual Activity Of Stock Option Plans [Table]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_AnnualActivityOfStockOptionPlansTable_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Annual Activity Of Stock Option Plans [Table]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">2023 (remaining nine months)</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Finite-Lived Intangible Asset, Expected Amortization, Remainder of Fiscal Year</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationBeforeTax_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Income (expense) related to fair value of derivative investments reclassified from accumulated other comprehensive earnings</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationBeforeTax_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_FixedRateOfThreePointFiveZeroPercentBalloonDueMayTwentyTwoThousandFiftyOneMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Fixed Rate of 3.50%, Balloon Due May 20, 2051 [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_FixedRateOfThreePointFiveZeroPercentBalloonDueMayTwentyTwoThousandFiftyOneMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Fixed Rate Of Three Point Five Zero Percent Balloon Due May Twenty Two Thousand Fifty One [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_FixedRateOfThreePointFiveZeroPercentBalloonDueMayTwentyTwoThousandFiftyOneMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Fixed rate of three point five zero percent balloon due May twenty two thousand fifty one.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_FloatingInterestRateOfOnePointFourZeroPercentLIBORPlusBalloonDueJuneThirteenTwoThousandTwentyFourMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Floating Interest Rate of 1.40% LIBOR Plus Balloon Due June 13, 2024 [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_FloatingInterestRateOfOnePointFourZeroPercentLIBORPlusBalloonDueJuneThirteenTwoThousandTwentyFourMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Floating Interest Rate Of One Point Four Zero Percent L I B O R Plus Balloon Due June Thirteen Two Thousand Twenty Four [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_FloatingInterestRateOfOnePointFourZeroPercentLIBORPlusBalloonDueJuneThirteenTwoThousandTwentyFourMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Floating interest rate of one point four zero percent LIBOR plus balloon due June thirteen two thousand twenty four.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CallOptionMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Call Options [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CallOptionMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Call Option [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_FixedRatesOfFivePointZeroFourPercentageBalloonDueFebruaryThirteenTwoThousandTwentyNineMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Fixed Rate of 5.04%, Balloon due February 13, 2029 [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_FixedRatesOfFivePointZeroFourPercentageBalloonDueFebruaryThirteenTwoThousandTwentyNineMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Fixed Rates Of Five Point Zero Four Percentage Balloon Due February Thirteen Two Thousand Twenty Nine [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_FixedRatesOfFivePointZeroFourPercentageBalloonDueFebruaryThirteenTwoThousandTwentyNineMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Fixed rates of five point zero four percentage balloon due February thirteen two thousand twenty nine.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_InterbankRatePlusZeroPointEightThreeZeroPercentExpiresSeptemberFifteenTwoThousandTwentyFourMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Interbank rate plus zero point eight three zero percent expires September fifteen two thousand twenty four.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_InterbankRatePlusZeroPointEightThreeZeroPercentExpiresSeptemberFifteenTwoThousandTwentyFourMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Interbank Rate Plus Zero Point Eight Three Zero Percent Expires September Fifteen Two Thousand Twenty Four [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_InterbankRatePlusZeroPointEightThreeZeroPercentExpiresSeptemberFifteenTwoThousandTwentyFourMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Interbank Rates Plus 0.830% Expires September 15, 2024 [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_BusinessAcquisitionMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Business Acquisition [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_BusinessAcquisitionMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Business Acquisition [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_BusinessAcquisitionMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Business Acquisition [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_FixedRateOfFourPointZeroNinePercentBalloonDueAugustTwoTwoThousandTwentySevenMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Fixed Rate of 4.09%, Balloon Due August 2, 2027 [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_FixedRateOfFourPointZeroNinePercentBalloonDueAugustTwoTwoThousandTwentySevenMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Fixed Rate Of Four Point Zero Nine Percent Balloon Due August Two Two Thousand Twenty Seven [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_FixedRateOfFourPointZeroNinePercentBalloonDueAugustTwoTwoThousandTwentySevenMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Fixed rate of four point zero nine percent, balloon due August two, two thousand twenty seven.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_CommonStockOptionsRestrictedStockWarrantsAndChangesInCapitalizationLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Common Stock Options Restricted Stock Warrants And Changes In Capitalization [Line Items]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_CommonStockOptionsRestrictedStockWarrantsAndChangesInCapitalizationLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Common Stock Options Restricted Stock Warrants And Changes In Capitalization [Line Items]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_CommonStockOptionsRestrictedStockWarrantsAndChangesInCapitalizationLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Common Stock Options Restricted Stock Warrants And Changes In Capitalization [Line Items]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Finite-Lived Intangible Assets, Major Class Name</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Finite-Lived Intangible Assets, Major Class Name [Domain]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Table]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Income (expense) related to net adjustments to estimated fair value of liability for earnout obligations</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Business Acquisition, Pro Forma Net Income (Loss)</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfCashFlowSupplementalDisclosuresTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Supplemental Disclosures of Cash Flow Information</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfCashFlowSupplementalDisclosuresTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Schedule of Cash Flow, Supplemental Disclosures [Table Text Block]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_DerivativeInterestRateContractsHedgesSettled_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Derivative interest rate contracts hedges settled</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_DerivativeInterestRateContractsHedgesSettled_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Derivative Interest Rate Contracts Hedges Settled</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_DerivativeInterestRateContractsHedgesSettled_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Derivative interest rate contracts hedges settled.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_FixedRateOfFourPointFiveEightPercentBalloonDueFebruaryTwentySevenTwoThousandTwentyFourMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Fixed Rate of 4.58%, Balloon Due February 27, 2024 [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_FixedRateOfFourPointFiveEightPercentBalloonDueFebruaryTwentySevenTwoThousandTwentyFourMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Fixed Rate Of Four Point Five Eight Percent Balloon Due February Twenty Seven Two Thousand Twenty Four [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_FixedRateOfFourPointFiveEightPercentBalloonDueFebruaryTwentySevenTwoThousandTwentyFourMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Fixed rate of four point five eight percent, balloon due February twenty seven, two thousand twenty four.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_CurrentFiscalYearEndDate_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Current Fiscal Year End Date</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_CurrentFiscalYearEndDate_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Current Fiscal Year End Date</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InvestmentTypeAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Investment Type</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InvestmentTypeAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Investment Type [Axis]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_FixedRateOfFourPointFourNinePercentBalloonDueJanuaryThirtyTwoThousandFortyMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Fixed Rate of 4.49%, Balloon Due January 30, 2040 [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_FixedRateOfFourPointFourNinePercentBalloonDueJanuaryThirtyTwoThousandFortyMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Fixed Rate Of Four Point Four Nine Percent Balloon Due January Thirty Two Thousand Forty [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_FixedRateOfFourPointFourNinePercentBalloonDueJanuaryThirtyTwoThousandFortyMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Fixed Rate Of Four Point Four Nine Percent Balloon Due January Thirty Two Thousand Forty [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_UnsecuredMulticurrencyCreditAgreementMember_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Credit Agreement [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_UnsecuredMulticurrencyCreditAgreementMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Multi Currency Credit Agreement [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_UnsecuredMulticurrencyCreditAgreementMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Unsecured Multicurrency Credit Agreement [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_UnsecuredMulticurrencyCreditAgreementMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Unsecured Multicurrency Credit Agreement [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosureAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Derivative Instruments and Hedging Activities Disclosure [Abstract]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosureAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Derivative Instruments and Hedging Activities Disclosure [Abstract]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_Depreciation_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Depreciation, Total</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_Depreciation_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Depreciation</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_Depreciation_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Depreciation</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Finite-Lived Intangible Assets by Major Class</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_OtherForeignMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Other Foreign [Member]</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CostsAndExpenses_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Costs and Expenses</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_PrimeOrLiborPlusUpToOnePointFourFivePercentExpiresJuneSevenTwoThousandTwentyFourMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Prime or LIBOR Plus up to 1.45%, Expires June 7, 2024 [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_PrimeOrLiborPlusUpToOnePointFourFivePercentExpiresJuneSevenTwoThousandTwentyFourMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Prime Or Libor Plus Up To One Point Four Five Percent Expires June Seven Two Thousand Twenty Four [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_PrimeOrLiborPlusUpToOnePointFourFivePercentExpiresJuneSevenTwoThousandTwentyFourMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Prime or LIBOR plus up to one point four five percent expires June seven two thousand twenty four.</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_SeniorUnsecuredNoteMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Senior Unsecured Note [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_SeniorUnsecuredNoteMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Senior unsecured notes.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_GoodwillAndIntangibleAssetsDisclosureAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Goodwill and Intangible Assets Disclosure [Abstract]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EquityAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Equity [Abstract]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PaymentsForCapitalImprovements_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Capital expenditures</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PaymentsForCapitalImprovements_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Payments for Capital Improvements</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ContractWithCustomerLiabilityRevenueRecognized_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Revenue recognized during the three-month period ended March 31, 2023 included in deferred revenue at December 31, 2022</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ContractWithCustomerLiabilityRevenueRecognized_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Contract with Customer, Liability, Revenue Recognized</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_UpToTenMillionMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Up to $10 Million [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_UpToTenMillionMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Up To Ten Million [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_UpToTenMillionMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Up to ten million.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockGrantedDuringPeriodValueSharebasedCompensation_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Shares Granted, Value, Share-Based Payment Arrangement, after Forfeiture, Total</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockGrantedDuringPeriodValueSharebasedCompensation_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Compensation expense related to stock option grants</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockGrantedDuringPeriodValueSharebasedCompensation_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Compensation expense related to stock option plan grants</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockGrantedDuringPeriodValueSharebasedCompensation_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Shares Granted, Value, Share-Based Payment Arrangement, after Forfeiture</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Weighted Average Exercise Price, Forfeited or canceled</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtInstrumentInterestRateStatedPercentage_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Periodic payment of interest</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtInstrumentInterestRateStatedPercentage_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Debt Instrument, Interest Rate, Stated Percentage</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AdditionalPaidInCapitalCommonStock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Capital in excess of par value</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AdditionalPaidInCapitalCommonStock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Additional Paid in Capital, Common Stock</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_StatementScenarioAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Scenario</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_StatementScenarioAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Scenario [Axis]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardTermsOfAward_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Provisional awards, terms</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardTermsOfAward_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Compensation Arrangement by Share-Based Payment Award, Terms of Award</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_UnamortizedDebtIssuanceExpense_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Less unamortized debt acquisition costs on Senior Notes and Note Purchase Agreements</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_UnamortizedDebtIssuanceExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Unamortized Debt Issuance Expense</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_GainsOnDivestituresMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Net Gains on Divestitures [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_GainsOnDivestituresMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Gains On Divestitures [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_GainsOnDivestituresMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Gains On Divestitures [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityFilerCategory_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Entity Filer Category</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityFilerCategory_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Entity Filer Category</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_Range08Member_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Range08 [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_Range08Member_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Range 08.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_Range08Member_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Exercise Prices Range $ 158.56 - $ 161.14 [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_IghMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">IGH [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_IghMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">IGH [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_IghMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">IGH.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ForwardContractsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Forward Contracts [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ForwardContractsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Forward Contracts [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_TenYearNotesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">10-year Note [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_TenYearNotesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Ten Year Notes [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_TenYearNotesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Ten year notes.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OptionIndexedToIssuersEquityTypeDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Option Indexed to Issuer's Equity, Type</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OptionIndexedToIssuersEquityTypeDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Option Indexed to Issuer's Equity, Type [Domain]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment, Total</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Fixed assets</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingExpenses_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Operating Expenses, Total</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingExpenses_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Operating</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingExpenses_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Operating Expenses</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityCurrentReportingStatus_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Entity Current Reporting Status</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityCurrentReportingStatus_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Entity Current Reporting Status</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsOther_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Other current assets</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsOther_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Other</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_GainsLossesOnExtinguishmentOfDebtRelatedToOperatingActivities_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Gains (losses) on extinguishment of debt related to operating activities.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_GainsLossesOnExtinguishmentOfDebtRelatedToOperatingActivities_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Gains Losses On Extinguishment Of Debt Related To Operating Activities</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_GainsLossesOnExtinguishmentOfDebtRelatedToOperatingActivities_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Loss on extinguishment of debt</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsNonvestedAndExpectedToVestExercisableWeightedAverageExercisePrice_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Weighted Average Exercise Price, Ending unvested and expected to vest</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsNonvestedAndExpectedToVestExercisableWeightedAverageExercisePrice_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share Based Compensation Arrangement By Share Based Payment Award Options Nonvested And Expected To Vest Exercisable Weighted Average Exercise Price</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsNonvestedAndExpectedToVestExercisableWeightedAverageExercisePrice_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Share Based Compensation Arrangement By Share Based Payment Award Options Nonvested And Expected To Vest Exercisable Weighted Average Exercise Price</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Aggregate Intrinsic Value, Exercisable at end of year</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Intrinsic Value</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_FixedRateOfFourPointFiveNinePercentBalloonDueJuneThirteenTwoThousandThirtyThreeMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Fixed Rate of 4.59%, Balloon due June 13, 2033 [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_FixedRateOfFourPointFiveNinePercentBalloonDueJuneThirteenTwoThousandThirtyThreeMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Fixed Rate Of Four Point Five Nine Percent Balloon Due June Thirteen Two Thousand Thirty Three [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_FixedRateOfFourPointFiveNinePercentBalloonDueJuneThirteenTwoThousandThirtyThreeMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Fixed rate of four point five nine percent balloon due June thirteen two thousand thirty three.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessCombinationsAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Business Combinations [Abstract]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FiniteLivedIntangibleAssetsNet_lbl" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel">Finite-Lived Intangible Assets, Net, Ending Balance</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FiniteLivedIntangibleAssetsNet_lbl" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel">Finite-Lived Intangible Assets, Net, Beginning Balance</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FiniteLivedIntangibleAssetsNet_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Amortizable intangible assets, net</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FiniteLivedIntangibleAssetsNet_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Amortizable intangible assets - net</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FiniteLivedIntangibleAssetsNet_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Finite-Lived Intangible Assets, Net</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockholdersEquity_lbl" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel">Stockholders' Equity Attributable to Parent, Ending Balance</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockholdersEquity_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Stockholders' equity attributable to controlling interests</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockholdersEquity_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Stockholders' Equity Attributable to Parent</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncomeApproachValuationTechniqueMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Valuation, Income Approach</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncomeApproachValuationTechniqueMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Valuation, Income Approach [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AccumulatedOtherComprehensiveIncomeMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Accumulated Other Comprehensive Loss [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AccumulatedOtherComprehensiveIncomeMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">AOCI Attributable to Parent [Member]</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Effect of Exchange Rate on Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Including Disposal Group and Discontinued Operations</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityTaxIdentificationNumber_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Entity Tax Identification Number</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityTaxIdentificationNumber_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Entity Tax Identification Number</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncomeStatementLocationAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Income Statement Location</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncomeStatementLocationAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Income Statement Location [Axis]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonStockValue_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Common stock - issued and outstanding 214.2 shares in 2023 and 211.9 shares in 2022</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_ExpirationListsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Expiration Lists [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_ExpirationListsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Expiration Lists [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StatementEquityComponentsAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Equity Components</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StatementEquityComponentsAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Equity Components [Axis]</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_RecordedUnconditionalPurchaseObligationReceivableInSecondYear_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Recorded Unconditional Purchase Obligation Receivable In Second Year</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_RecordedUnconditionalPurchaseObligationReceivableInSecondYear_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Recorded unconditional purchase obligation receivable in second year.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_TypeOfAdoptionMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Accounting Standards Update</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_TypeOfAdoptionMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Accounting Standards Update [Domain]</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_FixedRateOfThreePointSixNinePercentBalloonDueJuneFourteenTwoThousandTwentyTwoMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Fixed Rate Of Three Point Six Nine Percent Balloon Due June Fourteen Two Thousand Twenty Two [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_FixedRateOfThreePointSixNinePercentBalloonDueJuneFourteenTwoThousandTwentyTwoMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Fixed rate of three point six nine percent, balloon due June fourteen, two thousand twenty two.</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodFairValue_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period Fair Value</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodFairValue_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period Fair Value</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ContractWithCustomerLiability_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Contract with Customer, Liability, Total</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ContractWithCustomerLiability_lbl" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel">Deferred revenue beginning balance</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ContractWithCustomerLiability_lbl" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel">Deferred revenue ending balance</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ContractWithCustomerLiability_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Contract with Customer, Liability</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_FixedRateOfFourPointOneNinePercentBalloonDueJuneTwentySevenTwoThousandTwentyNineMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Fixed Rate of 4.19%, Balloon Due June 27, 2029 [Member]</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_AmountOfCommitmentExpirationOffBalanceSheetCommitmentsWithinYearThereafter_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Amount Of Commitment Expiration Off Balance Sheet Commitments Within Year Thereafter</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_AmountOfCommitmentExpirationOffBalanceSheetCommitmentsWithinYearThereafter_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Amount of Commitment Expiration Off-Balance Sheet Commitments Within Year Thereafter</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NumberOfBusinessesAcquired_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Number of companies acquired</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_FiduciaryCash_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Fiduciary cash</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_FiduciaryCash_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Fiduciary cash.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityEmergingGrowthCompany_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Entity Emerging Growth Company</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityEmergingGrowthCompany_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Entity Emerging Growth Company</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Schedule Of Business Acquisitions By Acquisition [Table]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Schedule of Business Acquisitions, by Acquisition [Table]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_StockOptionPlansTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Stock Option Plans</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_StockOptionPlansTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Stock Option Plans [Text Block]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_StockOptionPlansTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Stock Option Plans Text Block</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_StockOptionPlansLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Stock Option Plans [Line Items]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_StockOptionPlansLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Stock Option Plans [Line Items]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_StockOptionPlansLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Stock Option Plans [Line Items]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtInstrumentDescriptionOfVariableRateBasis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Quarterly payments of interest, description</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_GoodwillLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Goodwill [Line Items]</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_RestatementAdjustmentMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Revision of Prior Period, Adjustment [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RetirementPlanTypeDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Retirement Plan Type</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="country_CA_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Canada [Member]</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_FiduciaryAssetsCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Fiduciary assets current.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LetterOfCreditMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Letter of Credit [Member]</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Expected life (in years)</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_RecordedEarnOutPayable_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Recorded Earnout Payable</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_AccruedCompensationAndOtherCurrentLiabilitiesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Accrued compensation and other current liabilities [Member]</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_FixedRateOfFivePointFourFivePercentBalloonDueMarchThirteenTwoThousandThirtyNineMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Fixed Rate of 5.45%, balloon due March 13, 2039 [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_FixedRateOfFivePointFourFivePercentBalloonDueMarchThirteenTwoThousandThirtyNineMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Fixed Rate Of Five Point Four Five Percent Balloon Due March Thirteen Two Thousand Thirty Nine [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_FixedRateOfFivePointFourFivePercentBalloonDueMarchThirteenTwoThousandThirtyNineMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Fixed rate of five point four five percent balloon due march thirteen two thousand thirty nine.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CollateralPledgedMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Collateral [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CollateralPledgedMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Collateral Pledged [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Schedule Of Segment Reporting Information By Segment [Table]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Schedule of Segment Reporting Information, by Segment [Table]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_TwoThousandSeventeenLongTermincentivePlanMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">2017 Long Term Incentive Plan [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_TwoThousandSeventeenLongTermincentivePlanMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Two Thousand Seventeen Long Termincentive Plan [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_TwoThousandSeventeenLongTermincentivePlanMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">2017 Long Term Incentive Plan [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_NumberOfCommercialCleanCoalProductionFacilities_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Number of commercial clean coal production facilities</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_NumberOfCommercialCleanCoalProductionFacilities_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Number Of Commercial Clean Coal Production Facilities</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_NumberOfCommercialCleanCoalProductionFacilities_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Number of commercial clean coal production facilities.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfAccumulatedOtherComprehensiveIncomeLossTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Schedule of Accumulated Other Comprehensive Loss Attributable to Controlling Interests</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfAccumulatedOtherComprehensiveIncomeLossTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommitmentsAndContingenciesDisclosureTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Commitments, Contingencies and Off-Balance Sheet Arrangements</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommitmentsAndContingenciesDisclosureTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Commitments and Contingencies Disclosure [Text Block]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Weighted Average Exercise Price, Exercised</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_lbl" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel">Balance as of March 31, 2023</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_lbl" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel">Balance as of December 31, 2022</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Accumulated Other Comprehensive Income (Loss), Net of Tax, Total</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Accumulated other comprehensive loss</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Accumulated Other Comprehensive Income (Loss), Net of Tax</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_ExpirationLists_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Expiration lists</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_ExpirationLists_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Expiration Lists</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_ExpirationLists_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Expiration lists</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AccountsReceivableNetCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Accounts receivable, net</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AccountsReceivableNetCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Accounts Receivable, after Allowance for Credit Loss, Current</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AccountsReceivableNetCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Accounts Receivable, after Allowance for Credit Loss, Current, Total</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_TwoThousandTwentyProvisionalCashAwardsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">2020 Provisional Cash Awards [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_TwoThousandTwentyProvisionalCashAwardsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Two Thousand Twenty Provisional Cash Awards [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_TwoThousandTwentyProvisionalCashAwardsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Two thousand twenty provisional cash awards.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityCommonStockSharesOutstanding_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Entity Common Stock, Shares Outstanding</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityCommonStockSharesOutstanding_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Entity Common Stock, Shares Outstanding</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeLossNetOfTax_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Other Comprehensive Income (Loss), Net of Tax, Total</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeLossNetOfTax_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Net change in period</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeLossNetOfTax_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Other Comprehensive Income (Loss), Net of Tax</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_RestatementDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Revision of Prior Period [Domain]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_FixedRateOfFivePointOneFourPercentBalloonDueMarchThirteenTwoThousandThirtyOneMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Fixed Rate of 5.14%, Balloon due March 13, 2031 [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_FixedRateOfFivePointOneFourPercentBalloonDueMarchThirteenTwoThousandThirtyOneMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Fixed Rate Of Five Point One Four Percent Balloon Due March Thirteen Two Thousand Thirty One [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_FixedRateOfFivePointOneFourPercentBalloonDueMarchThirteenTwoThousandThirtyOneMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Fixed rate of five point one four percent balloon due march thirteen two thousand thirty one.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_MinorityInterestIncreaseDecreaseFromRedemptions_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Net purchase of subsidiary shares from noncontrolling interests</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_MinorityInterestIncreaseDecreaseFromRedemptions_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Minority Interest Increase Decrease From Redemptions</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_MinorityInterestIncreaseDecreaseFromRedemptions_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Minority interest increase decrease from redemptions.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NetIncomeLoss_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Net earnings attributable to controlling interests</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NetIncomeLoss_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Net earnings attributable to controlling interests</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NetIncomeLoss_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Net Income (Loss) Attributable to Parent</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Exercise Price Range</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Exercise Price Range [Domain]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_NineOtherAcquisitionsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Nine Other Acquisitions [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_NineOtherAcquisitionsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Nine Other Acquisitions [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_NineOtherAcquisitionsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Nine other acquisitions.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_UpToTwentySevenPointZeroMillionMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Up to $27.0 Million [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_UpToTwentySevenPointZeroMillionMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Up To Twenty Seven Point Zero Million [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_UpToTwentySevenPointZeroMillionMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Up to twenty seven point zero million.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_ScheduleOfBusinessAcquisitionProFormaTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Summary of Unaudited Pro Forma Historical Results</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_ScheduleOfBusinessAcquisitionProFormaTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Schedule Of Business Acquisition Pro Forma Table [Text Block]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_ScheduleOfBusinessAcquisitionProFormaTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Schedule Of Business Acquisition, Pro Forma [Text Block]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AdditionalPaidInCapitalMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Capital in Excess of Par Value [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AdditionalPaidInCapitalMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Additional Paid-in Capital [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_LettersOfCreditMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Letters of Credit [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_LettersOfCreditMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Letters Of Credit [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_LettersOfCreditMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Letters Of Credit [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_FixedRateOfThreePointFourSixPercentageBalloonDueDecemberOneTwoThousandTwentySevenMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Fixed Rate of 3.46%, Balloon Due December 1, 2027 [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_FixedRateOfThreePointFourSixPercentageBalloonDueDecemberOneTwoThousandTwentySevenMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Fixed Rate Of Three Point Four Six Percentage Balloon Due December One Two Thousand Twenty Seven [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_FixedRateOfThreePointFourSixPercentageBalloonDueDecemberOneTwoThousandTwentySevenMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Fixed rate of three point four six percentage, balloon due December one, two thousand twenty seven.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsSharesAgainstPool_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Shares against the pool</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsSharesAgainstPool_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Shares Against Pool</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsSharesAgainstPool_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Share-based compensation arrangement by share-based payment award, equity instruments other than options, shares against pool</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Other Information Regarding Stock Options Outstanding and Exercisable</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Payment Arrangement, Option, Exercise Price Range [Table Text Block]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityRegistrantName_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Entity Registrant Name</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityRegistrantName_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Entity Registrant Name</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_FixedRateOfFourPointNineEightPercentBalloonDueFebruaryTwentySevenTwoThousandTwentyNineMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Fixed Rate of 4.98%, Balloon Due February 27, 2029 [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_FixedRateOfFourPointNineEightPercentBalloonDueFebruaryTwentySevenTwoThousandTwentyNineMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Fixed Rate Of Four Point Nine Eight Percent Balloon Due February Twenty Seven Two Thousand Twenty Nine [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_FixedRateOfFourPointNineEightPercentBalloonDueFebruaryTwentySevenTwoThousandTwentyNineMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Fixed rate of four point nine eight percent, balloon due February twenty seven, two thousand twenty nine.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Total</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Other comprehensive income (loss), foreign currency transaction and translation adjustment, net of tax</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Foreign currency translation</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CashAndCashEquivalentsAtCarryingValue_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Cash and cash equivalents - non-restricted cash</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CashAndCashEquivalentsAtCarryingValue_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Cash and Cash Equivalents, at Carrying Value, Total</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CashAndCashEquivalentsAtCarryingValue_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Cash and cash equivalents</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CashAndCashEquivalentsAtCarryingValue_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cash and Cash Equivalents, at Carrying Value</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EarningsPerShareTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Earnings Per Share</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EarningsPerShareTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Earnings Per Share [Text Block]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionsTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Black-Scholes Option Pricing Model with Weighted Average</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionsTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_FixedRateOfFivePointFiveZeroPercentBalloonDueMayTwoTwoThousandThirtyThreeMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Fixed Rate of 5.50%, Balloon Due May 2, 2033 [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_FixedRateOfFivePointFiveZeroPercentBalloonDueMayTwoTwoThousandThirtyThreeMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Fixed Rate of Five Point Five Zero Percent Balloon Due May Two Two Thousand Thirty Three [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_FixedRateOfFivePointFiveZeroPercentBalloonDueMayTwoTwoThousandThirtyThreeMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Fixed rate of five point five zero percent balloon due may two two thousand thirty three.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtInstrumentMaturityDate_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Periodic payments of interest and principal, expiry date</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtInstrumentMaturityDate_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Debt Instrument, Maturity Date</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensation_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Share-Based Payment Arrangement, Noncash Expense, Total</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensation_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Stock-based and other noncash compensation expense</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensation_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Payment Arrangement, Noncash Expense</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StatementOfIncomeAndComprehensiveIncomeAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Statement of Comprehensive Income [Abstract]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_TwoThousandNineteenProvisionalCashAwardsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">2019 Provisional Cash Awards [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_TwoThousandNineteenProvisionalCashAwardsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Two Thousand Nineteen Provisional Cash Awards [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_TwoThousandNineteenProvisionalCashAwardsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Two Thousand Nineteen Provisional Cash Awards [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PropertyPlantAndEquipmentNet_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Fiduciary assets</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PropertyPlantAndEquipmentNet_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Property, Plant and Equipment, Net, Total</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PropertyPlantAndEquipmentNet_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Fixed assets - net</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PropertyPlantAndEquipmentNet_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Property, Plant and Equipment, Net</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_MarketApproachValuationTechniqueMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Valuation, Market Approach [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_MarketApproachValuationTechniqueMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Valuation, Market Approach [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtInstrumentUnamortizedDiscount_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Debt Instrument, Unamortized Discount, Total</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtInstrumentUnamortizedDiscount_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Less unamortized discount on Bonds Payable</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtInstrumentUnamortizedDiscount_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Debt Instrument, Unamortized Discount</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Award Type</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Award Type [Domain]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StatementLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Statement [Line Items]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StatementLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Statement [Line Items]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_GoodwillPurchaseAccountingAdjustments_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Goodwill true-ups due to appraisals and other acquisition adjustments</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_GoodwillPurchaseAccountingAdjustments_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Goodwill, Purchase Accounting Adjustments</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredRevenueArrangementLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Deferred Revenue Arrangement [Line Items]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredRevenueArrangementLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Deferred Revenue Arrangement [Line Items]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_Security12bTitle_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Title of 12(b) Security</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_Security12bTitle_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Title of 12(b) Security</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FiniteLivedIntangibleAssetsGross_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Finite-Lived Intangible Assets, Gross, Total</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FiniteLivedIntangibleAssetsGross_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Amortizable intangible assets, gross</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FiniteLivedIntangibleAssetsGross_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Finite-Lived Intangible Assets, Gross</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_FixedRateOfTwoPointFourSixPercentBalloonDueMayFiveTwoThousandThirtySixMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Fixed Rate of 2.46%, Balloon Due May 5, 2036 [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_FixedRateOfTwoPointFourSixPercentBalloonDueMayFiveTwoThousandThirtySixMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Fixed Rate Of Two Point Four Six Percent Balloon Due May Five Two Thousand Thirty Six [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_FixedRateOfTwoPointFourSixPercentBalloonDueMayFiveTwoThousandThirtySixMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Fixed rate of two point four six percent balloon due May five two thousand thirty six.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_BchrHoldingsLPMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">BCHR Holdings, L.P. [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_BchrHoldingsLPMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">BCHR Holdings, L.P [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_BchrHoldingsLPMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Bchr holdings.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_RecordedUnconditionalPurchaseObligationReceivableInFourthYear_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Contractual Obligations, Payments Receivable by Period, 2027</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_RecordedUnconditionalPurchaseObligationReceivableInFourthYear_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Recorded Unconditional Purchase Obligation Receivable In Fourth Year</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_RecordedUnconditionalPurchaseObligationReceivableInFourthYear_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Recorded unconditional purchase obligation receivable in fourth year.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonStockMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Common Stock [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonStockMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Common Stock [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DerivativeNotionalAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Derivative notional amount</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DerivativeNotionalAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Notional Amount</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DerivativeNotionalAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Derivative, Notional Amount</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardExpirationPeriod_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Performance awards period, years</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardExpirationPeriod_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Cash flows from operating activities:</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Net Cash Provided by (Used in) Operating Activities [Abstract]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessAcquisitionsProFormaIncomeLossFromContinuingOperationsBeforeChangesInAccountingAndExtraordinaryItemsNetOfTax_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Net earnings</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessAcquisitionsProFormaIncomeLossFromContinuingOperationsBeforeChangesInAccountingAndExtraordinaryItemsNetOfTax_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Business Acquisition, Pro Forma Income (Loss) from Continuing Operations, Net of Tax</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EquityComponentDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Equity Component</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EquityComponentDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Equity Component [Domain]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_InterestRateContractsHedgesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Interest Rate Contracts Hedges [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_InterestRateContractsHedgesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Interest Rate Contracts Hedges [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_InterestRateContractsHedgesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Interest rate contracts hedges.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Total revenues</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Total revenues</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Revenue from Contract with Customer, Excluding Assessed Tax</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Earnings before income taxes</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Earnings before income taxes</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfCashAndCashEquivalentsTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Summary of Cash, Cash Equivalents, Restricted Cash and Fiduciary Cash</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfCashAndCashEquivalentsTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Schedule of Cash and Cash Equivalents [Table Text Block]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityAddressStateOrProvince_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Entity Address, State or Province</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityAddressStateOrProvince_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Entity Address, State or Province</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_StatementGeographicalAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Geographical</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_StatementGeographicalAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Geographical [Axis]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DerivativeInstrumentGainLossReclassifiedFromAociIntoIncomeEffectivePortionStatementOfIncomeOrComprehensiveIncomeExtensibleEnumeration_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Derivative Instrument, Gain (Loss) Reclassified from AOCI into Income, Effective Portion, Statement of Income or Comprehensive Income [Extensible Enumeration]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Net increase in cash, cash equivalents, restricted cash and fiduciary cash</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CapitalizedContractCostNet_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Capitalized Contract Cost, Net, Total</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CapitalizedContractCostNet_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Deferred contract costs</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CapitalizedContractCostNet_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Capitalized Contract Cost, Net</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_NumberOfLetterOfCreditIssued_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Number of letters of credit issued</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_NumberOfLetterOfCreditIssued_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Number Of Letter Of Credit Issued</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_NumberOfLetterOfCreditIssued_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Number Of Letter Of Credit Issued</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Comprehensive earnings</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_DocumentType_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Document Type</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_DocumentType_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Document Type</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax, Total</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Tax effect on net change in pension asset/liability</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="country_US_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Unites States [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="country_US_lbl" xlink:role="http://www.xbrl.org/2003/role/label">UNITED STATES</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityShellCompany_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Entity Shell Company</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityShellCompany_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Entity Shell Company</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_NumberOfSquareFeet_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Number of square feet</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_NumberOfSquareFeet_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Number Of Square Feet</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_NumberOfSquareFeet_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Number of square feet.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CollateralDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Collateral Held</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CollateralDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Collateral Held [Domain]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsNonVestedAndExpectedToVestNumberOfShares_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Shares Under Option, Ending unvested and expected to vest</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsNonVestedAndExpectedToVestNumberOfShares_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share Based Compensation Arrangement By Share Based Payment Award Options Non Vested And Expected To Vest Number Of Shares</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsNonVestedAndExpectedToVestNumberOfShares_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Share Based Compensation Arrangement by Share Based Payment Award Options Non Vested and Expected To Vest, Number of Shares</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AllocatedShareBasedCompensationExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Charge to compensation expenses related to awards</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AllocatedShareBasedCompensationExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Payment Arrangement, Expense</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SegmentReportingInformationLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Segment Reporting Information [Line Items]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SegmentReportingInformationLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Segment Reporting Information [Line Items]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_FixedRateOfThreePointNineNinePercentBalloonDueJanuaryThirtyTwoThousandThirtyMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Fixed Rate of 3.99%, Balloon Due January 30, 2030 [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_FixedRateOfThreePointNineNinePercentBalloonDueJanuaryThirtyTwoThousandThirtyMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Fixed Rate Of Three Point Nine Nine Percent Balloon Due January Thirty Two Thousand Thirty [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_FixedRateOfThreePointNineNinePercentBalloonDueJanuaryThirtyTwoThousandThirtyMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Fixed Rate Of Three Point Nine Nine Percent Balloon Due January Thirty Two Thousand Thirty [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_TwoThousandTwentyOneAcquisitionsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">2021 Acquisitions [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_TwoThousandTwentyOneAcquisitionsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Two Thousand Twenty One Acquisitions [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_TwoThousandTwentyOneAcquisitionsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Two Thousand Twenty One Acquisitions.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_PrimeOrSofrPlusUpToOnePointFourZeroPercentExpiresJuneSevenTwoThousandTwentyFourMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Prime or SOFR Plus up to 1.40%, Expires June 7, 2024 [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_PrimeOrSofrPlusUpToOnePointFourZeroPercentExpiresJuneSevenTwoThousandTwentyFourMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Prime Or SOFR Plus Up To One Point Four Zero Percent Expires June Seven Two Thousand Twenty Four [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_PrimeOrSofrPlusUpToOnePointFourZeroPercentExpiresJuneSevenTwoThousandTwentyFourMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Prime or SOFR plus up to one point four zero percent expires June seven two thousand twenty four.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_SecurityExchangeName_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Security Exchange Name</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_SecurityExchangeName_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Security Exchange Name</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RevenueFromContractWithCustomerAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Revenue from Contract with Customer [Abstract]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_ScheduleOfOffBalanceSheetCommitmentsTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Off-Balance Sheet Commitments</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_ScheduleOfOffBalanceSheetCommitmentsTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Schedule Of Off Balance Sheet Commitments Table [Text Block]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_ScheduleOfOffBalanceSheetCommitmentsTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Schedule Of Off-Balance Sheet Commitments [Table Text Block]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SignificantAccountingPoliciesTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Summary of Significant Accounting Policies</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SignificantAccountingPoliciesTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Significant Accounting Policies [Text Block]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_DeferredEquityParticipationPlanDistributionsToKeyExecutivesAge_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Deferred Equity Participation Plan, distributions to key executives, age</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_DeferredEquityParticipationPlanDistributionsToKeyExecutivesAge_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Deferred Equity Participation Plan Distributions To Key Executives Age</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_DeferredEquityParticipationPlanDistributionsToKeyExecutivesAge_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Deferred Equity Participation Plan, Distributions to Key Executives, Age</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NetCashProvidedByUsedInOperatingActivities_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Net cash provided by operating activities</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NetCashProvidedByUsedInOperatingActivities_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Net cash provided by operating activities</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NetCashProvidedByUsedInOperatingActivities_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Net Cash Provided by (Used in) Operating Activities</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_Range02Member_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Exercise Prices Range $ 70.74 - $ 70.74 [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_Range02Member_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Range02 [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_Range02Member_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Range 02 [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Option Outstanding, Weighted Average Remaining Contractual Term (in years)</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Weighted Average Remaining Contractual Term (in years), Ending balance</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_ContingentRevenueMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Contingent Revenue [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_ContingentRevenueMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Contingent Revenue [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_ContingentRevenueMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Contingent Revenue [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PaymentsToAcquireBusinessesGross_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Cash Paid</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PaymentsToAcquireBusinessesGross_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Payments to Acquire Businesses, Gross</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PaymentsToAcquireBusinessesGross_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Cash consideration</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommitmentsAndContingenciesDisclosureAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Commitments and Contingencies Disclosure [Abstract]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Net change in income taxes payable</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Increase (Decrease) in Income Taxes Payable</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_GainLossOnInvestments_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Gain (Loss) on Investments, Total</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_GainLossOnInvestments_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Net gain on investments and other</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_GainLossOnInvestments_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Gain (Loss) on Investments</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RestrictedStockUnitsRSUMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Restricted Stock Units (RSUs) [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RestrictedStockUnitsRSUMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Restricted Stock Units (RSUs) [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_BusinessCombinationPeriodOfExistence_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Business combination period of existence</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_BusinessCombinationPeriodOfExistence_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Business Combination Period Of Existence</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_BusinessCombinationPeriodOfExistence_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Business combination period of existence.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessAcquisitionsProFormaRevenue_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Total revenues</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessAcquisitionsProFormaRevenue_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Business Acquisition, Pro Forma Revenue</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Total assets acquired</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Stock Option Activity and Related Information</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Payment Arrangement, Option, Activity [Table Text Block]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Schedule Of Defined Benefit Plans Disclosures [Table]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Schedule of Defined Benefit Plans Disclosures [Table]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EscrowDeposit_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Escrow Deposited</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EscrowDeposit_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Escrow Deposit</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonStockSharesOutstanding_lbl" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel">Common Stock, Shares, Outstanding, Ending Balance</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonStockSharesOutstanding_lbl" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel">Common Stock, Shares, Outstanding, Beginning Balance</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonStockSharesOutstanding_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Common stock - outstanding shares</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonStockSharesOutstanding_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Common Stock, Shares, Outstanding</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessAcquisitionLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Business Acquisition [Line Items]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessAcquisitionLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Business Acquisition [Line Items]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtDisclosureTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Credit and Other Debt Agreements</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredRevenueCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Deferred Revenue, Current, Total</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredRevenueCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Deferred revenue - current</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredRevenueCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Deferred Revenue, Current</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Cash flows from investing activities:</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_FixedRatesOfFourPointEightFivePercentBalloonDueFebruaryThirteenTwoThousandTwentySixMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Fixed Rate of 4.85%, Balloon due February 13, 2026 [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_FixedRatesOfFourPointEightFivePercentBalloonDueFebruaryThirteenTwoThousandTwentySixMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Fixed Rates Of Four Point Eight Five Percent Balloon Due February Thirteen Two Thousand Twenty Six [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_FixedRatesOfFourPointEightFivePercentBalloonDueFebruaryThirteenTwoThousandTwentySixMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Fixed rates of four point eight five percent balloon due February thirteen two thousand twenty six.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Total net assets acquired</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonStockSharesIssued_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Common stock - issued shares</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonStockSharesIssued_lbl" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel">Beginning balance (in shares)</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonStockSharesIssued_lbl" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel">Ending balance, (in shares)</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonStockSharesIssued_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Common Stock, Shares, Issued</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosureTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Derivatives and Hedging Activity</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_TradingActivityByTypeAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Trading Activity [Axis]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedFiduciaryAssetsCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Fiduciary assets</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedFiduciaryAssetsCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Fiduciary Assets Current</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedFiduciaryAssetsCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Business combination recognized identifiable assets acquired and liabilities assumed fiduciary assets current.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_MinimumMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Minimum [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_MinimumMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Minimum [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_SupplementalRevenueMemberMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Supplemental Revenue Member [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_SupplementalRevenueMemberMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Supplemental Revenue Member [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_SupplementalRevenueMemberMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Supplemental revenue member [Member]</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ForeignExchangeMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Foreign Exchange [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_SelfInsuranceDeductiblesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Self-Insurance Deductibles [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_SelfInsuranceDeductiblesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Self Insurance Deductibles [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_SelfInsuranceDeductiblesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Self-Insurance Deductibles [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SegmentDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Segments</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SegmentDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Segments [Domain]</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Weighted Average Exercise Price, Exercisable at end of year</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Weighted Average Exercise Price</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RepaymentsOfLinesOfCredit_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Repayments on line of credit facility</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RepaymentsOfLinesOfCredit_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Repayments of Lines of Credit</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Accounting Standards Update</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtInstrumentAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Debt Instrument</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtInstrumentAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Debt Instrument [Axis]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockholdersEquityAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Stockholders' equity:</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockholdersEquityAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Stockholders' Equity Attributable to Parent [Abstract]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_PaymentsToAcquireBusinessesNetOfCashAndRestrictedCashAcquired_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Cash paid for acquisitions, net of cash and restricted cash acquired</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_PaymentsToAcquireBusinessesNetOfCashAndRestrictedCashAcquired_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Payments To Acquire Businesses Net Of Cash And Restricted Cash Acquired</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_PaymentsToAcquireBusinessesNetOfCashAndRestrictedCashAcquired_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Payments to acquire businesses, net of cash and restricted cash acquired.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StatementBusinessSegmentsAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Segments</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StatementBusinessSegmentsAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Segments [Axis]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RevenuePerformanceObligationAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Revenue, Performance Obligation [Abstract]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Diluted net earnings per share</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Business Acquisition, Pro Forma Earnings Per Share, Diluted</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RecordedUnconditionalPurchaseObligationDueWithinOneYear_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Contractual Obligations, Payments Due by Period, 2024</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RecordedUnconditionalPurchaseObligationDueWithinOneYear_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Recorded Unconditional Purchase Obligation, to be Paid, Year One</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AwardTypeAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Award Type</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AwardTypeAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Award Type [Axis]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Total unrecognized compensation cost related to nonvested options</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessCombinationConsiderationTransferred1_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Business Combination, Consideration Transferred, Total</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessCombinationConsiderationTransferred1_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Initial gross consideration</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessCombinationConsiderationTransferred1_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Business Combination, Consideration Transferred</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="country_NZ_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">New Zealand [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="country_NZ_lbl" xlink:role="http://www.xbrl.org/2003/role/label">NEW ZEALAND</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Total intrinsic value of unvested equity based awards</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period, Intrinsic Value</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_FacilityBMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Facility B [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_FacilityBMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Facility B [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_FacilityBMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Facility B [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFour_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Thereafter</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFour_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Finite Lived Intangible Assets Amortization Expense After Year Four</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFour_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Finite-lived intangible assets, amortization expense, after year four.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_MTinsuranceagencyincMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">M&amp;T Insurance Agency Inc.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_MTinsuranceagencyincMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">M&amp;TInsuranceAgencyInc[Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_MTinsuranceagencyincMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">M&amp;T Insurance Agency Inc [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_UpToTwentyPointZeroMillionMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Up to $20.0 Million [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_UpToTwentyPointZeroMillionMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Up To Twenty Point Zero Million [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_UpToTwentyPointZeroMillionMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Up to twenty point zero million.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_FixedRateOfTwoPointFourZeroPercentBalloonDueNovemberNineTwoThousandThirtyOneMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Fixed Rate of 2.40%, Balloon Due November 9, 2031 [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_FixedRateOfTwoPointFourZeroPercentBalloonDueNovemberNineTwoThousandThirtyOneMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Fixed Rate Of Two Point Four Zero Percent Balloon Due November Nine Two Thousand Thirty One [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_FixedRateOfTwoPointFourZeroPercentBalloonDueNovemberNineTwoThousandThirtyOneMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Fixed rate of two point four zero percent balloon due November nine two thousand thirty one.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_FixedRateOfFourPointThreeFourPercentBalloonDueJuneThirteenTwoThousandTwentyEightMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Fixed Rate of 4.34%, Balloon due June 13, 2028 [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_FixedRateOfFourPointThreeFourPercentBalloonDueJuneThirteenTwoThousandTwentyEightMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Fixed Rate Of Four Point Three Four Percent Balloon Due June Thirteen Two Thousand Twenty Eight [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_FixedRateOfFourPointThreeFourPercentBalloonDueJuneThirteenTwoThousandTwentyEightMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Fixed rate of four point three four percent balloon due June thirteen two thousand twenty eight.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityCentralIndexKey_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Entity Central Index Key</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FiniteLivedIntangibleAssetsLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Finite-Lived Intangible Assets [Line Items]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FiniteLivedIntangibleAssetsLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Finite-Lived Intangible Assets [Line Items]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_RiskManagementSegmentMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Risk Management [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_RiskManagementSegmentMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Risk Management Segment [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_RiskManagementSegmentMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Risk Management Segment Member</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_OtherFinancialDataDisclosureTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Other Financial Data</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SupplementaryInsuranceInformationBenefitsClaimsLossesAndSettlementExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Insurance claims, amount retained</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_AmountOfGainLossRecognizedEffectivenessTesting_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Amount of Gain Recognized in Earnings Related to Amount Excluded from Effectiveness Testing</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_AmountOfGainLossRecognizedEffectivenessTesting_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Amount Of Gain Loss Recognized Effectiveness Testing</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_AmountOfGainLossRecognizedEffectivenessTesting_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">The Amount of Gain Loss Recognized Effectiveness Testing</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardExpirationDate_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Performance awards expiration date</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardExpirationDate_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Date</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_BrokerageSegmentMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Brokerage [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_BrokerageSegmentMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Brokerage Segment [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_BrokerageSegmentMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Brokerage Segment Member</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_CommissionsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Commissions [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_CommissionsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Commissions [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_CommissionsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Commissions [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_FixedRateOfFourPointSevenZeroPercentBalloonDueJuneTwoTwoThousandThirtyOneMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Fixed Rate of 4.70%, Balloon Due June 2, 2031 [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_FixedRateOfFourPointSevenZeroPercentBalloonDueJuneTwoTwoThousandThirtyOneMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Fixed Rate Of Four Point Seven Zero Percent Balloon Due June Two Two Thousand Thirty One [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_FixedRateOfFourPointSevenZeroPercentBalloonDueJuneTwoTwoThousandThirtyOneMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Fixed rate of four point seven zero percent, balloon due June two, two thousand thirty one.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Volatility</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_AmountOfCommitmentExpirationOffBalanceSheetCommitmentsWithinYearOne_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Amount of Commitment Expiration by Period - 2023</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_AmountOfCommitmentExpirationOffBalanceSheetCommitmentsWithinYearOne_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Amount Of Commitment Expiration Off Balance Sheet Commitments Within Year One</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_AmountOfCommitmentExpirationOffBalanceSheetCommitmentsWithinYearOne_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Amount of Commitment Expiration Off-Balance Sheet Commitments Within Year One</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_DeferredCashParticipationPlanMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Deferred Cash Participation Plan [Member]</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_LocalPhoneNumber_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Local Phone Number</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Computation of Basic and Diluted Net EPS</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_AmountOfCommitmentExpirationOffBalanceSheetCommitmentsWithinYearThree_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Amount Of Commitment Expiration Off Balance Sheet Commitments Within Year Three</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_AmountOfCommitmentExpirationOffBalanceSheetCommitmentsWithinYearThree_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Amount of Commitment Expiration Off-Balance Sheet Commitments Within Year Three</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtDisclosureAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Debt Disclosure [Abstract]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Net Income (Loss) Attributable to Noncontrolling Interest, Total</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Shares Under Option, Exercisable at end of period</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Payment Arrangement, Option, Exercise Price Range [Table]</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_FixedRateOfFivePointSevenFivePercentBalloonDueMarchTwoTwoThousandFiftyThreeMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Fixed Rate of 5.75%, Balloon Due March 2, 2053 [Member]</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_lbl" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel">Shares Under Option, Ending balance</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtInstrumentNameDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Debt Instrument, Name</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingDate_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share Based Compensation Arrangement By Share Based Payment Award Award Vesting Date</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingDate_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Share Based Compensation Arrangement By Share Based Payment Award Award Vesting Date</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_NumberOfCredentialedActuaries_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Number of credentialed actuaries</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PremiumsAndOtherReceivablesNet_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Premiums and fees receivable</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_BusinessAcquisitionsProFormaNetIncomeLossToControllingInterest_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Business acquisitions pro forma net income loss to controlling interest.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_VestingDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Vesting</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EarningsPerShareBasic_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Earnings Per Share, Basic, Total</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EarningsPerShareBasic_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Earnings Per Share, Basic</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_DeferredEquityParticipationSubPlanDistributionsRequisiteServiceDescription_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Deferred Equity Participation Sub Plan Distributions Requisite Service Description</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_DeferredEquityParticipationSubPlanDistributionsRequisiteServiceDescription_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Deferred equity participation sub plan distributions requisite service description.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonStockDividendsPerShareDeclared_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Dividends declared per common share</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonStockDividendsPerShareDeclared_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Common Stock, Dividends, Per Share, Declared</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_BusinessCombinationAggregateEarnoutObligationRecordedMaximum_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Aggregate amount of maximum earnout obligations related to acquisitions, recorded in consolidated balance sheet</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_BusinessCombinationAggregateEarnoutObligationRecordedMaximum_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Business Combination Aggregate Earnout Obligation Recorded Maximum</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_BusinessCombinationAggregateEarnoutObligationRecordedMaximum_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Business Combination Aggregate Earnout Obligation Recorded Maximum</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DividendsCommonStockCash_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Cash dividends declared on common stock</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_BrokerFeesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Broker Fees [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_BrokerFeesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Broker Fees [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_BrokerFeesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Broker Fees [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_RecordedUnconditionalPurchaseObligationReceivableInThirdYear_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Contractual Obligations, Payments Receivable by Period, 2026</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_RecordedUnconditionalPurchaseObligationReceivableInThirdYear_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Recorded Unconditional Purchase Obligation Receivable In Third Year</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_RecordedUnconditionalPurchaseObligationReceivableInThirdYear_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Recorded unconditional purchase obligation receivable in third year.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_CommissionRevenueMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Commission revenue [Member]</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_WeightedAveragePeriod_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Weighted Average Period</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_SubleaseArrangementsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Less Sublease Arrangements [Member]</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_SubleaseArrangementsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Sublease arrangements.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinancialInstrumentAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Financial Instrument</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_ContractWithCustomerImpactOfChangeInForeignExchangeRates_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Impact of change in foreign exchange rates</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_UltimateAwardValueMultiplesOfOriginalValueOfUnitsMinimum_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Ultimate award value, multiples of original value of the units, minimum</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_UltimateAwardValueMultiplesOfOriginalValueOfUnitsMinimum_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Ultimate Award Value Multiples of Original Value of Units, Minimum</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_LaborAndRelatedExpenseMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Compensation expense [Member]</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_LaborAndRelatedExpenseMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Labor and related expense.</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ProfitLoss_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Net earnings</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_SharebasedCompensationArrangementNonVestedAndExpectedToVestOutstandingAggregateIntrinsicValue_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Share-based Compensation Arrangement Non Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">2027</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_TwoThousandTwentyTwoProvisionalCashAwardsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Two thousand twenty two provisional cash awards.</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SegmentReportingDisclosureTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Segment Information</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SegmentReportingDisclosureTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Segment Reporting Disclosure [Text Block]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_FixedRateOfFourPointOneThreePercentageBalloonDueJuneTwentyFourTwoThousandTwentyThreeMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Fixed Rate of 4.13%, Balloon Due June 24, 2023 [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_FixedRateOfFourPointOneThreePercentageBalloonDueJuneTwentyFourTwoThousandTwentyThreeMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Fixed Rate Of Four Point One Three Percentage Balloon Due June Twenty Four Two Thousand Twenty Three [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_FixedRateOfFourPointOneThreePercentageBalloonDueJuneTwentyFourTwoThousandTwentyThreeMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Fixed Rate Of Four Point One Three Percentage Balloon Due June Twenty Four Two Thousand Twenty Three [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_ContractWithCustomerLiabilityAdditions_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Incremental deferred revenue</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_ContractWithCustomerLiabilityAdditions_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Contract With Customer Liability Additions</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_ContractWithCustomerLiabilityAdditions_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Contract with customer, liability, additions.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfGoodwillTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Changes in Carrying Amount of Goodwill</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfGoodwillTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Schedule of Goodwill [Table Text Block]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_GuaranteeObligationsNatureDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Guarantor Obligations, Nature</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_GuaranteeObligationsNatureDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Guarantor Obligations, Nature [Domain]</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_Range06Member_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Range06 [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_Range06Member_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Range 06 [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_EighteenOtherAcquisitionsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Eighteen other acquisitions.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_EighteenOtherAcquisitionsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Eighteen Other Acquisitions [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtLongtermAndShorttermCombinedAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Semi-annual payments of interest, Net</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtLongtermAndShorttermCombinedAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Debt, Long-Term and Short-Term, Combined Amount</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_FixedRateOfThreePointSevenFivePercentBalloonDueJanuaryThirtyTwoThousandTwentySevenMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Fixed Rate of 3.75%, Balloon Due January 30, 2027 [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_FixedRateOfThreePointSevenFivePercentBalloonDueJanuaryThirtyTwoThousandTwentySevenMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Fixed Rate Of Three Point Seven Five Percent Balloon Due January Thirty Two Thousand Twenty Seven [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_FixedRateOfThreePointSevenFivePercentBalloonDueJanuaryThirtyTwoThousandTwentySevenMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Fixed Rate Of Three Point Seven Five Percent Balloon Due January Thirty Two Thousand Twenty Seven [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Entity</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Entity [Domain]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_ThirtyYearSeniorNotesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">30-year Senior Note [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_ThirtyYearSeniorNotesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Thirty Year Senior Notes [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_ThirtyYearSeniorNotesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Thirty year senior notes.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NotionalAmountOfDerivativesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Notional Disclosures [Abstract]</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_CarryingAmountOfGoodwillAllocatedByDomesticAndForeignOperationsTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Carrying Amount Of Goodwill Allocated By Domestic And Foreign Operations Table [Text Block]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_CarryingAmountOfGoodwillAllocatedByDomesticAndForeignOperationsTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Carrying Amount of Goodwill Allocated by Domestic and Foreign Operations</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_CoverAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cover [Abstract]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_UnearnedDeferredCompensationValue_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Unearned deferred compensation, value</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_UnearnedDeferredCompensationValue_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Unearned Deferred Compensation Value</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_UnearnedDeferredCompensationValue_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Unearned Deferred Compensation, Value</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_LongTermIncentivePlanMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Long Term Incentive Plan [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_LongTermIncentivePlanMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Long Term Incentive Plan [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_LongTermIncentivePlanMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Long Term Incentive Plan [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_ProductsAndServicesDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Product and Service</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_ProductsAndServicesDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Product and Service [Domain]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AccountingChangesAndErrorCorrectionsAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Accounting Changes and Error Corrections [Abstract]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AccountingChangesAndErrorCorrectionsAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Accounting Changes and Error Corrections [Abstract]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_ProvisionalCompensationCashAwardWithAggregateFairValueVestedAndDistributedToParticipants_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Cash award with aggregate fair value vested and distributed to participants</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_ProvisionalCompensationCashAwardWithAggregateFairValueVestedAndDistributedToParticipants_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Provisional Compensation Cash Award With Aggregate Fair Value Vested And Distributed To Participants</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_ProvisionalCompensationCashAwardWithAggregateFairValueVestedAndDistributedToParticipants_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Provisional compensation cash award with aggregate fair value vested and distributed to participants.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_FixedRateOfFivePointFourNinePercentBalloonDueFebruaryTenTwoThousandTwentyThreeMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Fixed Rate of 5.49%, Balloon Due February 10, 2023 [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_FixedRateOfFivePointFourNinePercentBalloonDueFebruaryTenTwoThousandTwentyThreeMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Fixed Rate Of Five Point Four Nine Percent Balloon Due February Ten Two Thousand Twenty Three [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_FixedRateOfFivePointFourNinePercentBalloonDueFebruaryTenTwoThousandTwentyThreeMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Fixed rate of five point four nine percent, balloon due February ten, two thousand twenty three.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NoncompeteAgreementsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Non-Compete Agreements [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NoncompeteAgreementsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Noncompete Agreements [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_MaximumMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Maximum [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_MaximumMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Maximum [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DefinedContributionPlanEmployerMatchingContributionPercentOfMatch_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Employer match on eligible compensation</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DefinedContributionPlanEmployerMatchingContributionPercentOfMatch_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Defined Contribution Plan, Employer Matching Contribution, Percent of Match</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueNonvested_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Total intrinsic value</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueNonvested_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Nonvested</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_NetChangeInAccruedCompensationAndOtherAccruedLiabilities_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Net change in accrued compensation and other accrued liabilities</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_NetChangeInAccruedCompensationAndOtherAccruedLiabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Net Change In Accrued Compensation And Other Accrued Liabilities</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_NetChangeInAccruedCompensationAndOtherAccruedLiabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Net change in accrued compensation and other accrued liabilities</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_BusinessCombinationAnnualizeRevenue_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Annualized revenue of business acquisitions</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_BusinessCombinationAnnualizeRevenue_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Business Combination Annualize Revenue</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_BusinessCombinationAnnualizeRevenue_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Business Combination, Annualize Revenue</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DerivativeInstrumentsGainLossLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Derivative Instruments, Gain (Loss) [Line Items]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DerivativeInstrumentsGainLossLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Derivative Instruments, Gain (Loss) [Line Items]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NetCashProvidedByUsedInInvestingActivities_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Net cash used by investing activities</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NetCashProvidedByUsedInInvestingActivities_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Net Cash Provided by (Used in) Investing Activities</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PaymentsForProceedsFromLoansReceivable_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Payments for (Proceeds from) Loans Receivable, Total</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PaymentsForProceedsFromLoansReceivable_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Net funding of premium finance loans</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PaymentsForProceedsFromLoansReceivable_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Payments for (Proceeds from) Loans Receivable</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_OperatingLeaseObligationMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Operating Lease Obligations [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_OperatingLeaseObligationMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Operating Lease Obligation [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_OperatingLeaseObligationMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Operating Lease Obligation [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_FixedRateOfFourPointSevenTwoPercentBalloonDueFebruaryThirteenTwoThousandTwentyFourMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Fixed Rate of 4.72%, Balloon due February 13, 2024 [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_FixedRateOfFourPointSevenTwoPercentBalloonDueFebruaryThirteenTwoThousandTwentyFourMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Fixed Rate Of Four Point Seven Two Percent Balloon Due February Thirteen Two Thousand Twenty Four [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_FixedRateOfFourPointSevenTwoPercentBalloonDueFebruaryThirteenTwoThousandTwentyFourMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Fixed Rate of 4.72%, Balloon due February 13, 2024 [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Shares Under Option, Exercised</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Stock option plans (in shares)</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CollateralAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Collateral Held</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CollateralAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Collateral Held [Axis]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_GoodwillAndIntangibleAssetsDisclosureTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Intangible Assets</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_GoodwillAndIntangibleAssetsDisclosureTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Goodwill and Intangible Assets Disclosure [Text Block]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_ShareBasedCompensationArrangementByShareBasedPaymentAwardAggregateFairValue_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Performance share awards approved, Fair value</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_ShareBasedCompensationArrangementByShareBasedPaymentAwardAggregateFairValue_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share Based Compensation Arrangement By Share Based Payment Award Aggregate Fair Value</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_ShareBasedCompensationArrangementByShareBasedPaymentAwardAggregateFairValue_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Share Based Compensation Arrangement By Share Based Payment Award Aggregate Fair Value</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Pension Liability [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_UseOfEstimates_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Use of Estimates</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_UseOfEstimates_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Use of Estimates, Policy [Policy Text Block]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Quarterly payments of interest rate</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Debt Instrument, Basis Spread on Variable Rate</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NotesIssued1_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Notes issued and sold</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NotesIssued1_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Notes Issued</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_CashAndEquityAwardWithAggregateFairValueVestedAndDistributedToParticipants_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cash And Equity Award With Aggregate Fair Value Vested And Distributed To Participants</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_CashAndEquityAwardWithAggregateFairValueVestedAndDistributedToParticipants_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Cash and equity award with aggregate fair value vested and distributed to participants.</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_CashBasedCompensationAwardExpenses_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Cash based compensation award, expenses</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">2026</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_CashCashEquivalentsRestrictedCashAndFiduciaryCash_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Total cash, cash equivalents, restricted cash and fiduciary cash</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_CashCashEquivalentsRestrictedCashAndFiduciaryCash_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cash, cash equivalents, restricted cash and fiduciary cash</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_CashCashEquivalentsRestrictedCashAndFiduciaryCash_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Cash, cash equivalents, restricted cash and fiduciary cash.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShortTermDebtTypeDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Short-term Debt, Type</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_TradingSymbol_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Trading Symbol</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_TradingSymbol_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Trading Symbol</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalentsAndRestrictedCash_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Cash and restricted cash</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalentsAndRestrictedCash_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Cash And Equivalents And Restricted Cash</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalentsAndRestrictedCash_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Business combination recognized identifiable assets acquired and liabilities assumed cash and equivalents and restricted cash.</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_ProceedsFromSubPlan_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Proceeds From Sub Plan</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InterestExpenseMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Interest expense [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InterestExpenseMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Interest Expense [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AccumulatedGainLossNetCashFlowHedgeParentMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Fair Value of Derivative Investments [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AccumulatedGainLossNetCashFlowHedgeParentMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_TitleOfIndividualWithRelationshipToEntityDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Title of Individual</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_RecordedUnconditionalPurchaseObligationReceivableInRemainderOfFiscalYear_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Contractual Obligations, Payments Receivable by Period, 2023</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_RecordedUnconditionalPurchaseObligationReceivableInRemainderOfFiscalYear_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Recorded unconditional purchase obligation receivable in remainder of fiscal year.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PerformanceSharesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Performance Shares [Member]</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_BusinessAcquisitionActualRevenueAndPreTaxIncomeLossTable_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Business Acquisition Actual Revenue And Pre Tax Income Loss [Table]</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PlanNameAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Plan Name</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_TitleOfIndividualAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Title of Individual</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_TitleOfIndividualAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Title of Individual [Axis]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_FixedRateOfFourPointFiveFivePercentBalloonDueJuneTwoTwoThousandTwentyEightMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Fixed Rate of 4.55%, Balloon Due June 2, 2028 [Member]</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ajg_DebtObligationMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Debt Obligation [Member]</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]</link:label>
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