<?xml version="1.0" encoding="US-ASCII"?>
<!-- DFS Xcelerate Taxonomy Labels Linkbase - http://www.dfsco.com/financial-services/ -->
<!-- Version: 6.23.6 -->
<!-- Round: 3 -->
<!-- Creation date: 2017-04-28T14:41:54Z -->
<!-- Copyright (c) 2017 Donnelley Financial, LLC. All Rights Reserved. -->
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    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_AgeOfEmployeeNoLongerSubjectToAwardForfeitureOnConditionCompliance" xlink:to="ajg_AgeOfEmployeeNoLongerSubjectToAwardForfeitureOnConditionCompliance_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_AllocatedShareBasedCompensationExpense" xlink:label="us-gaap_AllocatedShareBasedCompensationExpense"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_AllocatedShareBasedCompensationExpense_lbl" xml:lang="en-US" id="id_10729326_2023781_1_1">Allocated Share-based Compensation Expense</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_AllocatedShareBasedCompensationExpense_lbl" xml:lang="en-US" id="id_10729326_2023781_2_1">Charge to compensation expenses related to awards</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AllocatedShareBasedCompensationExpense" xlink:to="us-gaap_AllocatedShareBasedCompensationExpense_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_AmendmentFlag" xlink:label="dei_AmendmentFlag"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_AmendmentFlag_lbl" xml:lang="en-US" id="id_10729326_2024215_1_1">Amendment Flag</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="dei_AmendmentFlag_lbl" xml:lang="en-US" id="id_10729326_2024215_2_1">Amendment Flag</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_AmendmentFlag" xlink:to="dei_AmendmentFlag_lbl"/>
    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_AmortizationOfDeferredCompensationAndRestrictedStock" xlink:label="ajg_AmortizationOfDeferredCompensationAndRestrictedStock"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_AmortizationOfDeferredCompensationAndRestrictedStock_lbl" xml:lang="en-US" id="id_10729326_2291201_3_1">Amortization of deferred compensation and restricted stock</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_AmortizationOfDeferredCompensationAndRestrictedStock_lbl" xml:lang="en-US" id="id_10729326_2291201_1_1">Amortization Of Deferred Compensation And Restricted Stock</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_AmortizationOfDeferredCompensationAndRestrictedStock_lbl" xml:lang="en-US" id="id_10729326_2291201_2_1">Amortization of deferred compensation and restricted stock</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_AmortizationOfDeferredCompensationAndRestrictedStock" xlink:to="ajg_AmortizationOfDeferredCompensationAndRestrictedStock_lbl"/>
    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_AmountOfCommitmentExpirationOffBalanceSheetCommitments" xlink:label="ajg_AmountOfCommitmentExpirationOffBalanceSheetCommitments"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_AmountOfCommitmentExpirationOffBalanceSheetCommitments_lbl" xml:lang="en-US" id="id_10729326_2243080_3_1">Amount of Commitment Expiration Off-Balance Sheet Commitments</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_AmountOfCommitmentExpirationOffBalanceSheetCommitments_lbl" xml:lang="en-US" id="id_10729326_2243080_1_1">Amount Of Commitment Expiration Off Balance Sheet Commitments</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="ajg_AmountOfCommitmentExpirationOffBalanceSheetCommitments_lbl" xml:lang="en-US" id="id_10729326_2243080_6_1">Total Amounts Committed</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_AmountOfCommitmentExpirationOffBalanceSheetCommitments" xlink:to="ajg_AmountOfCommitmentExpirationOffBalanceSheetCommitments_lbl"/>
    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_AmountOfCommitmentExpirationOffBalanceSheetCommitmentsWithinYearFive" xlink:label="ajg_AmountOfCommitmentExpirationOffBalanceSheetCommitmentsWithinYearFive"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_AmountOfCommitmentExpirationOffBalanceSheetCommitmentsWithinYearFive_lbl" xml:lang="en-US" id="id_10729326_2277672_3_1">Amount of Commitment Expiration Off-Balance Sheet Commitments Within Year Five</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_AmountOfCommitmentExpirationOffBalanceSheetCommitmentsWithinYearFive_lbl" xml:lang="en-US" id="id_10729326_2277672_1_1">Amount Of Commitment Expiration Off Balance Sheet Commitments Within Year Five</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_AmountOfCommitmentExpirationOffBalanceSheetCommitmentsWithinYearFive_lbl" xml:lang="en-US" id="id_10729326_2277672_2_1">Amount of Commitment Expiration by Period - 2021</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_AmountOfCommitmentExpirationOffBalanceSheetCommitmentsWithinYearFive" xlink:to="ajg_AmountOfCommitmentExpirationOffBalanceSheetCommitmentsWithinYearFive_lbl"/>
    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_AmountOfCommitmentExpirationOffBalanceSheetCommitmentsWithinYearFour" xlink:label="ajg_AmountOfCommitmentExpirationOffBalanceSheetCommitmentsWithinYearFour"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_AmountOfCommitmentExpirationOffBalanceSheetCommitmentsWithinYearFour_lbl" xml:lang="en-US" id="id_10729326_2274946_3_1">Amount of Commitment Expiration Off-Balance Sheet Commitments Within Year Four</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_AmountOfCommitmentExpirationOffBalanceSheetCommitmentsWithinYearFour_lbl" xml:lang="en-US" id="id_10729326_2274946_1_1">Amount Of Commitment Expiration Off Balance Sheet Commitments Within Year Four</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_AmountOfCommitmentExpirationOffBalanceSheetCommitmentsWithinYearFour_lbl" xml:lang="en-US" id="id_10729326_2274946_2_1">Amount of Commitment Expiration by Period - 2020</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_AmountOfCommitmentExpirationOffBalanceSheetCommitmentsWithinYearFour" xlink:to="ajg_AmountOfCommitmentExpirationOffBalanceSheetCommitmentsWithinYearFour_lbl"/>
    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_AmountOfCommitmentExpirationOffBalanceSheetCommitmentsWithinYearOne" xlink:label="ajg_AmountOfCommitmentExpirationOffBalanceSheetCommitmentsWithinYearOne"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_AmountOfCommitmentExpirationOffBalanceSheetCommitmentsWithinYearOne_lbl" xml:lang="en-US" id="id_10729326_2064954_3_1">Amount of Commitment Expiration Off-Balance Sheet Commitments Within Year One</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_AmountOfCommitmentExpirationOffBalanceSheetCommitmentsWithinYearOne_lbl" xml:lang="en-US" id="id_10729326_2064954_1_1">Amount Of Commitment Expiration Off Balance Sheet Commitments Within Year One</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_AmountOfCommitmentExpirationOffBalanceSheetCommitmentsWithinYearOne_lbl" xml:lang="en-US" id="id_10729326_2064954_2_1">Amount of Commitment Expiration by Period - 2017</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_AmountOfCommitmentExpirationOffBalanceSheetCommitmentsWithinYearOne" xlink:to="ajg_AmountOfCommitmentExpirationOffBalanceSheetCommitmentsWithinYearOne_lbl"/>
    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_AmountOfCommitmentExpirationOffBalanceSheetCommitmentsWithinYearThereafter" xlink:label="ajg_AmountOfCommitmentExpirationOffBalanceSheetCommitmentsWithinYearThereafter"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_AmountOfCommitmentExpirationOffBalanceSheetCommitmentsWithinYearThereafter_lbl" xml:lang="en-US" id="id_10729326_2048995_3_1">Amount of Commitment Expiration Off-Balance Sheet Commitments Within Year Thereafter</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_AmountOfCommitmentExpirationOffBalanceSheetCommitmentsWithinYearThereafter_lbl" xml:lang="en-US" id="id_10729326_2048995_1_1">Amount Of Commitment Expiration Off Balance Sheet Commitments Within Year Thereafter</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_AmountOfCommitmentExpirationOffBalanceSheetCommitmentsWithinYearThereafter_lbl" xml:lang="en-US" id="id_10729326_2048995_2_1">Amount of Commitment Expiration by Period - Thereafter</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_AmountOfCommitmentExpirationOffBalanceSheetCommitmentsWithinYearThereafter" xlink:to="ajg_AmountOfCommitmentExpirationOffBalanceSheetCommitmentsWithinYearThereafter_lbl"/>
    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_AmountOfCommitmentExpirationOffBalanceSheetCommitmentsWithinYearThree" xlink:label="ajg_AmountOfCommitmentExpirationOffBalanceSheetCommitmentsWithinYearThree"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_AmountOfCommitmentExpirationOffBalanceSheetCommitmentsWithinYearThree_lbl" xml:lang="en-US" id="id_10729326_2368141_3_1">Amount of Commitment Expiration Off-Balance Sheet Commitments Within Year Three</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_AmountOfCommitmentExpirationOffBalanceSheetCommitmentsWithinYearThree_lbl" xml:lang="en-US" id="id_10729326_2368141_1_1">Amount Of Commitment Expiration Off Balance Sheet Commitments Within Year Three</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_AmountOfCommitmentExpirationOffBalanceSheetCommitmentsWithinYearThree_lbl" xml:lang="en-US" id="id_10729326_2368141_2_1">Amount of Commitment Expiration by Period - 2019</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_AmountOfCommitmentExpirationOffBalanceSheetCommitmentsWithinYearThree" xlink:to="ajg_AmountOfCommitmentExpirationOffBalanceSheetCommitmentsWithinYearThree_lbl"/>
    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_AmountOfCommitmentExpirationOffBalanceSheetCommitmentsWithinYearTwo" xlink:label="ajg_AmountOfCommitmentExpirationOffBalanceSheetCommitmentsWithinYearTwo"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_AmountOfCommitmentExpirationOffBalanceSheetCommitmentsWithinYearTwo_lbl" xml:lang="en-US" id="id_10729326_2367741_3_1">Amount of Commitment Expiration Off-Balance Sheet Commitments Within Year Two</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_AmountOfCommitmentExpirationOffBalanceSheetCommitmentsWithinYearTwo_lbl" xml:lang="en-US" id="id_10729326_2367741_1_1">Amount Of Commitment Expiration Off Balance Sheet Commitments Within Year Two</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_AmountOfCommitmentExpirationOffBalanceSheetCommitmentsWithinYearTwo_lbl" xml:lang="en-US" id="id_10729326_2367741_2_1">Amount of Commitment Expiration by Period - 2018</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_AmountOfCommitmentExpirationOffBalanceSheetCommitmentsWithinYearTwo" xlink:to="ajg_AmountOfCommitmentExpirationOffBalanceSheetCommitmentsWithinYearTwo_lbl"/>
    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_AnnualActivityOfStockOptionPlansTable" xlink:label="ajg_AnnualActivityOfStockOptionPlansTable"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_AnnualActivityOfStockOptionPlansTable_lbl" xml:lang="en-US" id="id_10729326_2191447_3_1">Annual Activity Of Stock Option Plans [Table]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_AnnualActivityOfStockOptionPlansTable_lbl" xml:lang="en-US" id="id_10729326_2191447_1_1">Annual Activity Of Stock Option Plans [Table]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_AnnualActivityOfStockOptionPlansTable_lbl" xml:lang="en-US" id="id_10729326_2191447_2_1">Annual Activity Of Stock Option Plans [Table]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_AnnualActivityOfStockOptionPlansTable" xlink:to="ajg_AnnualActivityOfStockOptionPlansTable_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_Assets" xlink:label="us-gaap_Assets"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_Assets_lbl" xml:lang="en-US" id="id_10729326_2023136_1_1">Assets</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_Assets_lbl" xml:lang="en-US" id="id_10729326_2023136_2_1">Identifiable assets at March 31, 2017 and 2016</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_Assets_lbl" xml:lang="en-US" id="id_10729326_2023136_6_1">Total assets</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_Assets" xlink:to="us-gaap_Assets_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_AssetsCurrent" xlink:label="us-gaap_AssetsCurrent"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_AssetsCurrent_lbl" xml:lang="en-US" id="id_10729326_2023790_1_1">Assets, Current</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_AssetsCurrent_lbl" xml:lang="en-US" id="id_10729326_2023790_6_1">Total current assets</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AssetsCurrent" xlink:to="us-gaap_AssetsCurrent_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/country/2016/country-2016-01-31.xsd#country_AU" xlink:label="country_AU"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="country_AU_lbl" xml:lang="en-US" id="id_10729326_2022492_1_1">AUSTRALIA</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="country_AU_lbl" xml:lang="en-US" id="id_10729326_2022492_2_1">Australia [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="country_AU" xlink:to="country_AU_lbl"/>
    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_AudDenominatedTrancheMember" xlink:label="ajg_AudDenominatedTrancheMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_AudDenominatedTrancheMember_lbl" xml:lang="en-US" id="id_10729326_2183846_3_1">Aud Denominated Tranche [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_AudDenominatedTrancheMember_lbl" xml:lang="en-US" id="id_10729326_2183846_1_1">Aud Denominated Tranche [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_AudDenominatedTrancheMember_lbl" xml:lang="en-US" id="id_10729326_2183846_2_1">AUD denominated tranche [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_AudDenominatedTrancheMember" xlink:to="ajg_AudDenominatedTrancheMember_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_AwardTypeAxis" xlink:label="us-gaap_AwardTypeAxis"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_AwardTypeAxis_lbl" xml:lang="en-US" id="id_10729326_2025317_1_1">Award Type [Axis]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_AwardTypeAxis_lbl" xml:lang="en-US" id="id_10729326_2025317_2_1">Award Type [Axis]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AwardTypeAxis" xlink:to="us-gaap_AwardTypeAxis_lbl"/>
    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_BlackScholesOptionPricingModelMember" xlink:label="ajg_BlackScholesOptionPricingModelMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_BlackScholesOptionPricingModelMember_lbl" xml:lang="en-US" id="id_10729326_2101271_3_1">Black-Scholes Option Pricing Model [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_BlackScholesOptionPricingModelMember_lbl" xml:lang="en-US" id="id_10729326_2101271_1_1">Black Scholes Option Pricing Model [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_BlackScholesOptionPricingModelMember_lbl" xml:lang="en-US" id="id_10729326_2101271_2_1">Black-Scholes Option Pricing Model [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_BlackScholesOptionPricingModelMember" xlink:to="ajg_BlackScholesOptionPricingModelMember_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_BrokerageCommissionsRevenue" xlink:label="us-gaap_BrokerageCommissionsRevenue"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_BrokerageCommissionsRevenue_lbl" xml:lang="en-US" id="id_10729326_2025983_1_1">Brokerage Commissions Revenue</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_BrokerageCommissionsRevenue_lbl" xml:lang="en-US" id="id_10729326_2025983_2_1">Fees</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_BrokerageCommissionsRevenue" xlink:to="us-gaap_BrokerageCommissionsRevenue_lbl"/>
    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_BrokerageSegmentMember" xlink:label="ajg_BrokerageSegmentMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_BrokerageSegmentMember_lbl" xml:lang="en-US" id="id_10729326_2125825_3_1">Brokerage Segment Member</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_BrokerageSegmentMember_lbl" xml:lang="en-US" id="id_10729326_2125825_1_1">Brokerage Segment [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_BrokerageSegmentMember_lbl" xml:lang="en-US" id="id_10729326_2125825_2_1">Brokerage [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_BrokerageSegmentMember" xlink:to="ajg_BrokerageSegmentMember_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_BusinessAcquisitionAcquireeDomain_lbl" xml:lang="en-US" id="id_10729326_2022941_1_1">Business Acquisition, Acquiree [Domain]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_BusinessAcquisitionAcquireeDomain_lbl" xml:lang="en-US" id="id_10729326_2022941_2_1">Business Acquisition, Acquiree [Domain]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_BusinessAcquisitionAcquireeDomain" xlink:to="us-gaap_BusinessAcquisitionAcquireeDomain_lbl"/>
    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_BusinessAcquisitionActualRevenueAndPreTaxIncomeLossLineItems" xlink:label="ajg_BusinessAcquisitionActualRevenueAndPreTaxIncomeLossLineItems"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_BusinessAcquisitionActualRevenueAndPreTaxIncomeLossLineItems_lbl" xml:lang="en-US" id="id_10729326_2068465_3_1">Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_BusinessAcquisitionActualRevenueAndPreTaxIncomeLossLineItems_lbl" xml:lang="en-US" id="id_10729326_2068465_1_1">Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_BusinessAcquisitionActualRevenueAndPreTaxIncomeLossLineItems_lbl" xml:lang="en-US" id="id_10729326_2068465_2_1">Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_BusinessAcquisitionActualRevenueAndPreTaxIncomeLossLineItems" xlink:to="ajg_BusinessAcquisitionActualRevenueAndPreTaxIncomeLossLineItems_lbl"/>
    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_BusinessAcquisitionActualRevenueAndPreTaxIncomeLossTable" xlink:label="ajg_BusinessAcquisitionActualRevenueAndPreTaxIncomeLossTable"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_BusinessAcquisitionActualRevenueAndPreTaxIncomeLossTable_lbl" xml:lang="en-US" id="id_10729326_2249691_3_1">Business Acquisition Actual Revenue And Pre Tax Income Loss [Table]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_BusinessAcquisitionActualRevenueAndPreTaxIncomeLossTable_lbl" xml:lang="en-US" id="id_10729326_2249691_1_1">Business Acquisition Actual Revenue And Pre Tax Income Loss [Table]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_BusinessAcquisitionActualRevenueAndPreTaxIncomeLossTable_lbl" xml:lang="en-US" id="id_10729326_2249691_2_1">Business Acquisition Actual Revenue And Pre Tax Income Loss [Table]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_BusinessAcquisitionActualRevenueAndPreTaxIncomeLossTable" xlink:to="ajg_BusinessAcquisitionActualRevenueAndPreTaxIncomeLossTable_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_BusinessAcquisitionAxis" xlink:label="us-gaap_BusinessAcquisitionAxis"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_BusinessAcquisitionAxis_lbl" xml:lang="en-US" id="id_10729326_2027704_1_1">Business Acquisition [Axis]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_BusinessAcquisitionAxis_lbl" xml:lang="en-US" id="id_10729326_2027704_2_1">Business Acquisition [Axis]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_BusinessAcquisitionAxis" xlink:to="us-gaap_BusinessAcquisitionAxis_lbl"/>
    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_BusinessAcquisitionCostOfAcquiredEntityPurchasePriceNet" xlink:label="ajg_BusinessAcquisitionCostOfAcquiredEntityPurchasePriceNet"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_BusinessAcquisitionCostOfAcquiredEntityPurchasePriceNet_lbl" xml:lang="en-US" id="id_10729326_2221113_3_1">Business Acquisition Cost Of Acquired Entity Purchase Price Net</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_BusinessAcquisitionCostOfAcquiredEntityPurchasePriceNet_lbl" xml:lang="en-US" id="id_10729326_2221113_1_1">Business Acquisition Cost Of Acquired Entity Purchase Price Net</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_BusinessAcquisitionCostOfAcquiredEntityPurchasePriceNet_lbl" xml:lang="en-US" id="id_10729326_2221113_2_1">Total Recorded Purchase Price</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_BusinessAcquisitionCostOfAcquiredEntityPurchasePriceNet" xlink:to="ajg_BusinessAcquisitionCostOfAcquiredEntityPurchasePriceNet_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_BusinessAcquisitionEffectiveDateOfAcquisition1" xlink:label="us-gaap_BusinessAcquisitionEffectiveDateOfAcquisition1"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_BusinessAcquisitionEffectiveDateOfAcquisition1_lbl" xml:lang="en-US" id="id_10729326_2026829_1_1">Business Acquisition, Effective Date of Acquisition</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_BusinessAcquisitionEffectiveDateOfAcquisition1_lbl" xml:lang="en-US" id="id_10729326_2026829_2_1">Effective Date of Acquisition</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_BusinessAcquisitionEffectiveDateOfAcquisition1" xlink:to="us-gaap_BusinessAcquisitionEffectiveDateOfAcquisition1_lbl"/>
    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_BusinessAcquisitionEffectiveDateOfAcquisitionYear" xlink:label="ajg_BusinessAcquisitionEffectiveDateOfAcquisitionYear"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_BusinessAcquisitionEffectiveDateOfAcquisitionYear_lbl" xml:lang="en-US" id="id_10729326_2306752_3_1">Business acquisition effective date of acquisition year.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_BusinessAcquisitionEffectiveDateOfAcquisitionYear_lbl" xml:lang="en-US" id="id_10729326_2306752_1_1">Business Acquisition Effective Date Of Acquisition Year</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_BusinessAcquisitionEffectiveDateOfAcquisitionYear_lbl" xml:lang="en-US" id="id_10729326_2306752_2_1">Effective Year of Acquisition</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_BusinessAcquisitionEffectiveDateOfAcquisitionYear" xlink:to="ajg_BusinessAcquisitionEffectiveDateOfAcquisitionYear_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued" xlink:label="us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued_lbl" xml:lang="en-US" id="id_10729326_2025106_1_1">Business Acquisition, Equity Interest Issued or Issuable, Number of Shares</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued_lbl" xml:lang="en-US" id="id_10729326_2025106_2_1">Common Shares Issued</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued" xlink:to="us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_BusinessAcquisitionLineItems" xlink:label="us-gaap_BusinessAcquisitionLineItems"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_BusinessAcquisitionLineItems_lbl" xml:lang="en-US" id="id_10729326_2022284_1_1">Business Acquisition [Line Items]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_BusinessAcquisitionLineItems_lbl" xml:lang="en-US" id="id_10729326_2022284_2_1">Business Acquisition [Line Items]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_BusinessAcquisitionLineItems" xlink:to="us-gaap_BusinessAcquisitionLineItems_lbl"/>
    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_BusinessAcquisitionMember" xlink:label="ajg_BusinessAcquisitionMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_BusinessAcquisitionMember_lbl" xml:lang="en-US" id="id_10729326_2050912_3_1">Business Acquisition [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_BusinessAcquisitionMember_lbl" xml:lang="en-US" id="id_10729326_2050912_1_1">Business Acquisition [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_BusinessAcquisitionMember_lbl" xml:lang="en-US" id="id_10729326_2050912_2_1">Business Acquisition [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_BusinessAcquisitionMember" xlink:to="ajg_BusinessAcquisitionMember_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic" xlink:label="us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic_lbl" xml:lang="en-US" id="id_10729326_2024023_1_1">Business Acquisition, Pro Forma Earnings Per Share, Basic</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic_lbl" xml:lang="en-US" id="id_10729326_2024023_2_1">Basic net earnings per share</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic" xlink:to="us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted" xlink:label="us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted_lbl" xml:lang="en-US" id="id_10729326_2035300_1_1">Business Acquisition, Pro Forma Earnings Per Share, Diluted</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted_lbl" xml:lang="en-US" id="id_10729326_2035300_2_1">Diluted net earnings per share</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted" xlink:to="us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted_lbl"/>
    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_BusinessAcquisitionPurchasePriceAllocationGoodwillNotExpectedTaxDeductibleAmount" xlink:label="ajg_BusinessAcquisitionPurchasePriceAllocationGoodwillNotExpectedTaxDeductibleAmount"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_BusinessAcquisitionPurchasePriceAllocationGoodwillNotExpectedTaxDeductibleAmount_lbl" xml:lang="en-US" id="id_10729326_2257635_3_1">Business Acquisition Purchase Price Allocation Goodwill Not Expected Tax Deductible Amount</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_BusinessAcquisitionPurchasePriceAllocationGoodwillNotExpectedTaxDeductibleAmount_lbl" xml:lang="en-US" id="id_10729326_2257635_1_1">Business Acquisition Purchase Price Allocation Goodwill Not Expected Tax Deductible Amount</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_BusinessAcquisitionPurchasePriceAllocationGoodwillNotExpectedTaxDeductibleAmount_lbl" xml:lang="en-US" id="id_10729326_2257635_2_1">Business acquisition not deductible for income tax purposes</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_BusinessAcquisitionPurchasePriceAllocationGoodwillNotExpectedTaxDeductibleAmount" xlink:to="ajg_BusinessAcquisitionPurchasePriceAllocationGoodwillNotExpectedTaxDeductibleAmount_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_BusinessAcquisitionsProFormaIncomeLossFromContinuingOperationsBeforeChangesInAccountingAndExtraordinaryItemsNetOfTax" xlink:label="us-gaap_BusinessAcquisitionsProFormaIncomeLossFromContinuingOperationsBeforeChangesInAccountingAndExtraordinaryItemsNetOfTax"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_BusinessAcquisitionsProFormaIncomeLossFromContinuingOperationsBeforeChangesInAccountingAndExtraordinaryItemsNetOfTax_lbl" xml:lang="en-US" id="id_10729326_2025532_1_1">Business Acquisition, Pro Forma Income (Loss) from Continuing Operations, Net of Tax</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_BusinessAcquisitionsProFormaIncomeLossFromContinuingOperationsBeforeChangesInAccountingAndExtraordinaryItemsNetOfTax_lbl" xml:lang="en-US" id="id_10729326_2025532_2_1">Net earnings</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_BusinessAcquisitionsProFormaIncomeLossFromContinuingOperationsBeforeChangesInAccountingAndExtraordinaryItemsNetOfTax" xlink:to="us-gaap_BusinessAcquisitionsProFormaIncomeLossFromContinuingOperationsBeforeChangesInAccountingAndExtraordinaryItemsNetOfTax_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss" xlink:label="us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss_lbl" xml:lang="en-US" id="id_10729326_2026831_1_1">Business Acquisition, Pro Forma Net Income (Loss)</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss_lbl" xml:lang="en-US" id="id_10729326_2026831_2_1">Income (expense) related to net adjustments to estimated fair value of liability for earnout obligations</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss" xlink:to="us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss_lbl"/>
    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_BusinessAcquisitionsProFormaNetIncomeLossToControllingInterest" xlink:label="ajg_BusinessAcquisitionsProFormaNetIncomeLossToControllingInterest"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_BusinessAcquisitionsProFormaNetIncomeLossToControllingInterest_lbl" xml:lang="en-US" id="id_10729326_2043575_3_1">Business acquisitions pro forma net income loss to controlling interest.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_BusinessAcquisitionsProFormaNetIncomeLossToControllingInterest_lbl" xml:lang="en-US" id="id_10729326_2043575_1_1">Business Acquisitions Pro Forma Net Income Loss To Controlling Interest</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_BusinessAcquisitionsProFormaNetIncomeLossToControllingInterest_lbl" xml:lang="en-US" id="id_10729326_2043575_2_1">Net earnings attributable to controlling interests</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_BusinessAcquisitionsProFormaNetIncomeLossToControllingInterest" xlink:to="ajg_BusinessAcquisitionsProFormaNetIncomeLossToControllingInterest_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_BusinessAcquisitionsProFormaRevenue" xlink:label="us-gaap_BusinessAcquisitionsProFormaRevenue"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_BusinessAcquisitionsProFormaRevenue_lbl" xml:lang="en-US" id="id_10729326_2024024_1_1">Business Acquisition, Pro Forma Revenue</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_BusinessAcquisitionsProFormaRevenue_lbl" xml:lang="en-US" id="id_10729326_2024024_2_1">Total revenues</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_BusinessAcquisitionsProFormaRevenue_lbl" xml:lang="en-US" id="id_10729326_2024024_12_1">Total revenues related to acquisitions in the aggregate</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_BusinessAcquisitionsProFormaRevenue" xlink:to="us-gaap_BusinessAcquisitionsProFormaRevenue_lbl"/>
    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_BusinessAcquisitionsPurchasePriceAllocationGoodwillAmount" xlink:label="ajg_BusinessAcquisitionsPurchasePriceAllocationGoodwillAmount"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_BusinessAcquisitionsPurchasePriceAllocationGoodwillAmount_lbl" xml:lang="en-US" id="id_10729326_2359887_3_1">Business Acquisitions Purchase Price Allocation Goodwill Amount</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_BusinessAcquisitionsPurchasePriceAllocationGoodwillAmount_lbl" xml:lang="en-US" id="id_10729326_2359887_1_1">Business Acquisitions Purchase Price Allocation Goodwill Amount</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_BusinessAcquisitionsPurchasePriceAllocationGoodwillAmount_lbl" xml:lang="en-US" id="id_10729326_2359887_2_1">Goodwill</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_BusinessAcquisitionsPurchasePriceAllocationGoodwillAmount" xlink:to="ajg_BusinessAcquisitionsPurchasePriceAllocationGoodwillAmount_lbl"/>
    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_BusinessCombinationAggregateEarnoutObligationMaximum" xlink:label="ajg_BusinessCombinationAggregateEarnoutObligationMaximum"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_BusinessCombinationAggregateEarnoutObligationMaximum_lbl" xml:lang="en-US" id="id_10729326_2244342_3_1">Business Combination ,Aggregate Earnout Obligation, Maximum</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_BusinessCombinationAggregateEarnoutObligationMaximum_lbl" xml:lang="en-US" id="id_10729326_2244342_1_1">Business Combination Aggregate Earnout Obligation Maximum</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_BusinessCombinationAggregateEarnoutObligationMaximum_lbl" xml:lang="en-US" id="id_10729326_2244342_2_1">Aggregate amount of maximum earnout obligations related to acquisitions</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_BusinessCombinationAggregateEarnoutObligationMaximum" xlink:to="ajg_BusinessCombinationAggregateEarnoutObligationMaximum_lbl"/>
    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_BusinessCombinationAggregateEarnoutObligationRecordedMaximum" xlink:label="ajg_BusinessCombinationAggregateEarnoutObligationRecordedMaximum"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_BusinessCombinationAggregateEarnoutObligationRecordedMaximum_lbl" xml:lang="en-US" id="id_10729326_2332545_3_1">Business Combination Aggregate Earnout Obligation Recorded Maximum</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_BusinessCombinationAggregateEarnoutObligationRecordedMaximum_lbl" xml:lang="en-US" id="id_10729326_2332545_1_1">Business Combination Aggregate Earnout Obligation Recorded Maximum</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_BusinessCombinationAggregateEarnoutObligationRecordedMaximum_lbl" xml:lang="en-US" id="id_10729326_2332545_2_1">Aggregate amount of maximum earnout obligations related to acquisitions, recorded in consolidated balance sheet</label>
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    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease" xlink:label="us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease_lbl" xml:lang="en-US" id="id_10729326_2023171_1_1">Cash and Cash Equivalents, Period Increase (Decrease)</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease_lbl" xml:lang="en-US" id="id_10729326_2023171_6_1">Net increase (decrease) in cash and cash equivalents</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease" xlink:to="us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_CashAndCashEquivalentsRestrictedCashAndCashEquivalentsPolicy" xlink:label="us-gaap_CashAndCashEquivalentsRestrictedCashAndCashEquivalentsPolicy"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_CashAndCashEquivalentsRestrictedCashAndCashEquivalentsPolicy_lbl" xml:lang="en-US" id="id_10729326_2022303_1_1">Cash and Cash Equivalents, Restricted Cash and Cash Equivalents, Policy [Policy Text Block]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_CashAndCashEquivalentsRestrictedCashAndCashEquivalentsPolicy_lbl" xml:lang="en-US" id="id_10729326_2022303_2_1">Restricted Cash</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CashAndCashEquivalentsRestrictedCashAndCashEquivalentsPolicy" xlink:to="us-gaap_CashAndCashEquivalentsRestrictedCashAndCashEquivalentsPolicy_lbl"/>
    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_CashAndEquityAwardWithAggregateFairValueVestedAndDistributedToParticipants" xlink:label="ajg_CashAndEquityAwardWithAggregateFairValueVestedAndDistributedToParticipants"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_CashAndEquityAwardWithAggregateFairValueVestedAndDistributedToParticipants_lbl" xml:lang="en-US" id="id_10729326_2101059_3_1">Cash and equity award with aggregate fair value vested and distributed to participants.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_CashAndEquityAwardWithAggregateFairValueVestedAndDistributedToParticipants_lbl" xml:lang="en-US" id="id_10729326_2101059_1_1">Cash And Equity Award With Aggregate Fair Value Vested And Distributed To Participants</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_CashAndEquityAwardWithAggregateFairValueVestedAndDistributedToParticipants_lbl" xml:lang="en-US" id="id_10729326_2101059_2_1">Cash and equity awards with aggregate fair value vested and distributed to participants</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_CashAndEquityAwardWithAggregateFairValueVestedAndDistributedToParticipants" xlink:to="ajg_CashAndEquityAwardWithAggregateFairValueVestedAndDistributedToParticipants_lbl"/>
    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_CashAwardsMember" xlink:label="ajg_CashAwardsMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_CashAwardsMember_lbl" xml:lang="en-US" id="id_10729326_2285691_3_1">Cash Awards [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_CashAwardsMember_lbl" xml:lang="en-US" id="id_10729326_2285691_1_1">Cash Awards [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_CashAwardsMember_lbl" xml:lang="en-US" id="id_10729326_2285691_2_1">Cash Awards [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_CashAwardsMember" xlink:to="ajg_CashAwardsMember_lbl"/>
    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_CashAwardsPerformancePeriod" xlink:label="ajg_CashAwardsPerformancePeriod"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_CashAwardsPerformancePeriod_lbl" xml:lang="en-US" id="id_10729326_2133172_3_1">Cash Awards Performance Period</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_CashAwardsPerformancePeriod_lbl" xml:lang="en-US" id="id_10729326_2133172_1_1">Cash Awards Performance Period</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_CashAwardsPerformancePeriod_lbl" xml:lang="en-US" id="id_10729326_2133172_2_1">Performance period, years</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_CashAwardsPerformancePeriod" xlink:to="ajg_CashAwardsPerformancePeriod_lbl"/>
    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_CashBasedCompensationAwardExpenses" xlink:label="ajg_CashBasedCompensationAwardExpenses"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_CashBasedCompensationAwardExpenses_lbl" xml:lang="en-US" id="id_10729326_2223365_3_1">Cash based compensation award, expenses</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_CashBasedCompensationAwardExpenses_lbl" xml:lang="en-US" id="id_10729326_2223365_1_1">Cash Based Compensation Award Expenses</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_CashBasedCompensationAwardExpenses_lbl" xml:lang="en-US" id="id_10729326_2223365_2_1">Cash-based compensation awards, expenses</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_CashBasedCompensationAwardExpenses" xlink:to="ajg_CashBasedCompensationAwardExpenses_lbl"/>
    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_CashSettledPerformanceSharesMember" xlink:label="ajg_CashSettledPerformanceSharesMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_CashSettledPerformanceSharesMember_lbl" xml:lang="en-US" id="id_10729326_2274761_3_1">Cash Settled Performance Shares [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_CashSettledPerformanceSharesMember_lbl" xml:lang="en-US" id="id_10729326_2274761_1_1">Cash Settled Performance Shares [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_CashSettledPerformanceSharesMember_lbl" xml:lang="en-US" id="id_10729326_2274761_2_1">Cash Settled Performance Shares [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_CashSettledPerformanceSharesMember" xlink:to="ajg_CashSettledPerformanceSharesMember_lbl"/>
    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_ChangeInEstimatedAcquisitionEarnoutPayables" xlink:label="ajg_ChangeInEstimatedAcquisitionEarnoutPayables"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_ChangeInEstimatedAcquisitionEarnoutPayables_lbl" xml:lang="en-US" id="id_10729326_2279215_3_1">Change in estimated acquisition earnout payables</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_ChangeInEstimatedAcquisitionEarnoutPayables_lbl" xml:lang="en-US" id="id_10729326_2279215_1_1">Change In Estimated Acquisition Earnout Payables</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_ChangeInEstimatedAcquisitionEarnoutPayables_lbl" xml:lang="en-US" id="id_10729326_2279215_2_1">Change in estimated acquisition earnout payables</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_ChangeInEstimatedAcquisitionEarnoutPayables" xlink:to="ajg_ChangeInEstimatedAcquisitionEarnoutPayables_lbl"/>
    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_ChemModInternationalLlcMember" xlink:label="ajg_ChemModInternationalLlcMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_ChemModInternationalLlcMember_lbl" xml:lang="en-US" id="id_10729326_2223387_3_1">Chem Mod International Llc [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_ChemModInternationalLlcMember_lbl" xml:lang="en-US" id="id_10729326_2223387_1_1">Chem Mod International Llc [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_ChemModInternationalLlcMember_lbl" xml:lang="en-US" id="id_10729326_2223387_2_1">Chem-Mod International LLC [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_ChemModInternationalLlcMember" xlink:to="ajg_ChemModInternationalLlcMember_lbl"/>
    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_ChemModLlcMember" xlink:label="ajg_ChemModLlcMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_ChemModLlcMember_lbl" xml:lang="en-US" id="id_10729326_2231694_3_1">Chem Mod LLC [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_ChemModLlcMember_lbl" xml:lang="en-US" id="id_10729326_2231694_1_1">Chem Mod Llc [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_ChemModLlcMember_lbl" xml:lang="en-US" id="id_10729326_2231694_2_1">Chem-Mod LLC [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_ChemModLlcMember" xlink:to="ajg_ChemModLlcMember_lbl"/>
    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_CleanCoalInvestmentsMember" xlink:label="ajg_CleanCoalInvestmentsMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_CleanCoalInvestmentsMember_lbl" xml:lang="en-US" id="id_10729326_2119386_3_1">Clean-Coal Investments [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_CleanCoalInvestmentsMember_lbl" xml:lang="en-US" id="id_10729326_2119386_1_1">Clean Coal Investments [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_CleanCoalInvestmentsMember_lbl" xml:lang="en-US" id="id_10729326_2119386_2_1">Clean-Coal Investments [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_CleanCoalInvestmentsMember" xlink:to="ajg_CleanCoalInvestmentsMember_lbl"/>
    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_CollateralizedDelinquencyReceivablesPeriod" xlink:label="ajg_CollateralizedDelinquencyReceivablesPeriod"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_CollateralizedDelinquencyReceivablesPeriod_lbl" xml:lang="en-US" id="id_10729326_2209460_3_1">Collateralized Delinquency Receivables Period</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_CollateralizedDelinquencyReceivablesPeriod_lbl" xml:lang="en-US" id="id_10729326_2209460_1_1">Collateralized Delinquency Receivables Period</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_CollateralizedDelinquencyReceivablesPeriod_lbl" xml:lang="en-US" id="id_10729326_2209460_2_1">Collateralized delinquency period of receivables</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_CollateralizedDelinquencyReceivablesPeriod" xlink:to="ajg_CollateralizedDelinquencyReceivablesPeriod_lbl"/>
    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_CommissionRevenueMember" xlink:label="ajg_CommissionRevenueMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_CommissionRevenueMember_lbl" xml:lang="en-US" id="id_10729326_2376127_3_1">Commission Revenue [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_CommissionRevenueMember_lbl" xml:lang="en-US" id="id_10729326_2376127_1_1">Commission Revenue [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_CommissionRevenueMember_lbl" xml:lang="en-US" id="id_10729326_2376127_2_1">Commission Revenue [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_CommissionRevenueMember" xlink:to="ajg_CommissionRevenueMember_lbl"/>
    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_Commissions" xlink:label="ajg_Commissions"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_Commissions_lbl" xml:lang="en-US" id="id_10729326_2178307_3_1">Commissions</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_Commissions_lbl" xml:lang="en-US" id="id_10729326_2178307_1_1">Commissions</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_Commissions_lbl" xml:lang="en-US" id="id_10729326_2178307_2_1">Commissions</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_Commissions" xlink:to="ajg_Commissions_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_CommitmentsAndContingenciesDisclosureAbstract" xlink:label="us-gaap_CommitmentsAndContingenciesDisclosureAbstract"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_CommitmentsAndContingenciesDisclosureAbstract_lbl" xml:lang="en-US" id="id_10729326_2026024_1_1">Commitments and Contingencies Disclosure [Abstract]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_CommitmentsAndContingenciesDisclosureAbstract_lbl" xml:lang="en-US" id="id_10729326_2026024_2_1">Commitments and Contingencies Disclosure [Abstract]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CommitmentsAndContingenciesDisclosureAbstract" xlink:to="us-gaap_CommitmentsAndContingenciesDisclosureAbstract_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_CommitmentsAndContingenciesDisclosureTextBlock" xlink:label="us-gaap_CommitmentsAndContingenciesDisclosureTextBlock"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_CommitmentsAndContingenciesDisclosureTextBlock_lbl" xml:lang="en-US" id="id_10729326_2027090_1_1">Commitments and Contingencies Disclosure [Text Block]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_CommitmentsAndContingenciesDisclosureTextBlock_lbl" xml:lang="en-US" id="id_10729326_2027090_2_1">Commitments, Contingencies and Off-Balance Sheet Arrangements</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CommitmentsAndContingenciesDisclosureTextBlock" xlink:to="us-gaap_CommitmentsAndContingenciesDisclosureTextBlock_lbl"/>
    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_CommitmentsContingenciesAndOffBalanceSheetArrangementsLineItems" xlink:label="ajg_CommitmentsContingenciesAndOffBalanceSheetArrangementsLineItems"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_CommitmentsContingenciesAndOffBalanceSheetArrangementsLineItems_lbl" xml:lang="en-US" id="id_10729326_2278402_3_1">Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_CommitmentsContingenciesAndOffBalanceSheetArrangementsLineItems_lbl" xml:lang="en-US" id="id_10729326_2278402_1_1">Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_CommitmentsContingenciesAndOffBalanceSheetArrangementsLineItems_lbl" xml:lang="en-US" id="id_10729326_2278402_2_1">Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_CommitmentsContingenciesAndOffBalanceSheetArrangementsLineItems" xlink:to="ajg_CommitmentsContingenciesAndOffBalanceSheetArrangementsLineItems_lbl"/>
    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_CommitmentsContingenciesAndOffBalanceSheetArrangementsTable" xlink:label="ajg_CommitmentsContingenciesAndOffBalanceSheetArrangementsTable"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_CommitmentsContingenciesAndOffBalanceSheetArrangementsTable_lbl" xml:lang="en-US" id="id_10729326_2132162_3_1">Commitments Contingencies And Off Balance Sheet Arrangements [Table]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_CommitmentsContingenciesAndOffBalanceSheetArrangementsTable_lbl" xml:lang="en-US" id="id_10729326_2132162_1_1">Commitments Contingencies And Off Balance Sheet Arrangements [Table]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_CommitmentsContingenciesAndOffBalanceSheetArrangementsTable_lbl" xml:lang="en-US" id="id_10729326_2132162_2_1">Commitments Contingencies And Off Balance Sheet Arrangements [Table]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_CommitmentsContingenciesAndOffBalanceSheetArrangementsTable" xlink:to="ajg_CommitmentsContingenciesAndOffBalanceSheetArrangementsTable_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_CommonStockDividendsPerShareDeclared" xlink:label="us-gaap_CommonStockDividendsPerShareDeclared"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_CommonStockDividendsPerShareDeclared_lbl" xml:lang="en-US" id="id_10729326_2024488_1_1">Common Stock, Dividends, Per Share, Declared</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_CommonStockDividendsPerShareDeclared_lbl" xml:lang="en-US" id="id_10729326_2024488_2_1">Dividends declared per common share</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CommonStockDividendsPerShareDeclared" xlink:to="us-gaap_CommonStockDividendsPerShareDeclared_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_CommonStockMember" xlink:label="us-gaap_CommonStockMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_CommonStockMember_lbl" xml:lang="en-US" id="id_10729326_2027302_1_1">Common Stock [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_CommonStockMember_lbl" xml:lang="en-US" id="id_10729326_2027302_2_1">Common Stock [Member]</label>
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    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_CommonStockOptionsRestrictedStockWarrantsAndChangesInCapitalizationLineItems" xlink:label="ajg_CommonStockOptionsRestrictedStockWarrantsAndChangesInCapitalizationLineItems"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_CommonStockOptionsRestrictedStockWarrantsAndChangesInCapitalizationLineItems_lbl" xml:lang="en-US" id="id_10729326_2144184_3_1">Common Stock Options Restricted Stock Warrants And Changes In Capitalization [Line Items]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_CommonStockOptionsRestrictedStockWarrantsAndChangesInCapitalizationLineItems_lbl" xml:lang="en-US" id="id_10729326_2144184_1_1">Common Stock Options Restricted Stock Warrants And Changes In Capitalization [Line Items]</label>
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    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_CommonStockOptionsRestrictedStockWarrantsAndChangesInCapitalizationLineItems" xlink:to="ajg_CommonStockOptionsRestrictedStockWarrantsAndChangesInCapitalizationLineItems_lbl"/>
    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_CommonStockOptionsRestrictedStockWarrantsAndChangesInCapitalizationTable" xlink:label="ajg_CommonStockOptionsRestrictedStockWarrantsAndChangesInCapitalizationTable"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_CommonStockOptionsRestrictedStockWarrantsAndChangesInCapitalizationTable_lbl" xml:lang="en-US" id="id_10729326_2305466_3_1">Common Stock Options Restricted Stock Warrants And Changes In Capitalization [Table]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_CommonStockOptionsRestrictedStockWarrantsAndChangesInCapitalizationTable_lbl" xml:lang="en-US" id="id_10729326_2305466_1_1">Common Stock Options Restricted Stock Warrants And Changes In Capitalization [Table]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_CommonStockOptionsRestrictedStockWarrantsAndChangesInCapitalizationTable_lbl" xml:lang="en-US" id="id_10729326_2305466_2_1">Common Stock Options Restricted Stock Warrants And Changes In Capitalization [Table]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_CommonStockOptionsRestrictedStockWarrantsAndChangesInCapitalizationTable" xlink:to="ajg_CommonStockOptionsRestrictedStockWarrantsAndChangesInCapitalizationTable_lbl"/>
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    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_CommonStockSharesIssued_lbl" xml:lang="en-US" id="id_10729326_2022978_1_1">Common Stock, Shares, Issued</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_CommonStockSharesIssued_lbl" xml:lang="en-US" id="id_10729326_2022978_2_1">Common stock - issued shares</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CommonStockSharesIssued" xlink:to="us-gaap_CommonStockSharesIssued_lbl"/>
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    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_CommonStockSharesOutstanding_lbl" xml:lang="en-US" id="id_10729326_2022748_1_1">Common Stock, Shares, Outstanding</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_CommonStockSharesOutstanding_lbl" xml:lang="en-US" id="id_10729326_2022748_2_1">Common stock - outstanding shares</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CommonStockSharesOutstanding" xlink:to="us-gaap_CommonStockSharesOutstanding_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_CommonStockValue" xlink:label="us-gaap_CommonStockValue"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_CommonStockValue_lbl" xml:lang="en-US" id="id_10729326_2025780_1_1">Common Stock, Value, Issued</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_CommonStockValue_lbl" xml:lang="en-US" id="id_10729326_2025780_2_1">Common stock - issued and outstanding 179.5 shares in 2017 and 178.3 shares in 2016</label>
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    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_CompensationApprovedByCommitteeValue" xlink:label="ajg_CompensationApprovedByCommitteeValue"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_CompensationApprovedByCommitteeValue_lbl" xml:lang="en-US" id="id_10729326_2242891_3_1">Compensation approved by committee, value</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_CompensationApprovedByCommitteeValue_lbl" xml:lang="en-US" id="id_10729326_2242891_1_1">Compensation Approved By Committee Value</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_CompensationApprovedByCommitteeValue_lbl" xml:lang="en-US" id="id_10729326_2242891_2_1">Awards approved by committee, value</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_CompensationApprovedByCommitteeValue" xlink:to="ajg_CompensationApprovedByCommitteeValue_lbl"/>
    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_CompensationExpenseMember" xlink:label="ajg_CompensationExpenseMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_CompensationExpenseMember_lbl" xml:lang="en-US" id="id_10729326_2141008_3_1">Compensation Expense [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_CompensationExpenseMember_lbl" xml:lang="en-US" id="id_10729326_2141008_1_1">Compensation Expense [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_CompensationExpenseMember_lbl" xml:lang="en-US" id="id_10729326_2141008_2_1">Compensation Expense [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_CompensationExpenseMember" xlink:to="ajg_CompensationExpenseMember_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_CompensationRelatedCostsAbstract" xlink:label="us-gaap_CompensationRelatedCostsAbstract"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_CompensationRelatedCostsAbstract_lbl" xml:lang="en-US" id="id_10729326_2021435_1_1">Compensation Related Costs [Abstract]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_CompensationRelatedCostsAbstract_lbl" xml:lang="en-US" id="id_10729326_2021435_2_1">Compensation Related Costs [Abstract]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CompensationRelatedCostsAbstract" xlink:to="us-gaap_CompensationRelatedCostsAbstract_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_CompensationRelatedCostsGeneralTextBlock" xlink:label="us-gaap_CompensationRelatedCostsGeneralTextBlock"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_CompensationRelatedCostsGeneralTextBlock_lbl" xml:lang="en-US" id="id_10729326_2022980_1_1">Compensation Related Costs, General [Text Block]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_CompensationRelatedCostsGeneralTextBlock_lbl" xml:lang="en-US" id="id_10729326_2022980_2_1">Deferred Compensation</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CompensationRelatedCostsGeneralTextBlock" xlink:to="us-gaap_CompensationRelatedCostsGeneralTextBlock_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ComprehensiveIncomeNetOfTax" xlink:label="us-gaap_ComprehensiveIncomeNetOfTax"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ComprehensiveIncomeNetOfTax_lbl" xml:lang="en-US" id="id_10729326_2025782_1_1">Comprehensive Income (Loss), Net of Tax, Attributable to Parent</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_ComprehensiveIncomeNetOfTax_lbl" xml:lang="en-US" id="id_10729326_2025782_6_1">Comprehensive earnings attributable to controlling interests</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ComprehensiveIncomeNetOfTax" xlink:to="us-gaap_ComprehensiveIncomeNetOfTax_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest" xlink:label="us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest_lbl" xml:lang="en-US" id="id_10729326_2026427_1_1">Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest_lbl" xml:lang="en-US" id="id_10729326_2026427_2_1">Comprehensive earnings attributable to noncontrolling interests</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest" xlink:to="us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest" xlink:label="us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest_lbl" xml:lang="en-US" id="id_10729326_2035324_1_1">Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest_lbl" xml:lang="en-US" id="id_10729326_2035324_6_1">Comprehensive earnings</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest" xlink:to="us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ComprehensiveIncomeNoteTextBlock" xlink:label="us-gaap_ComprehensiveIncomeNoteTextBlock"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ComprehensiveIncomeNoteTextBlock_lbl" xml:lang="en-US" id="id_10729326_2024494_1_1">Comprehensive Income (Loss) Note [Text Block]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_ComprehensiveIncomeNoteTextBlock_lbl" xml:lang="en-US" id="id_10729326_2024494_2_1">Accumulated Other Comprehensive Earnings (Loss)</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ComprehensiveIncomeNoteTextBlock" xlink:to="us-gaap_ComprehensiveIncomeNoteTextBlock_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ConsolidationItemsAxis" xlink:label="us-gaap_ConsolidationItemsAxis"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ConsolidationItemsAxis_lbl" xml:lang="en-US" id="id_10729326_2022117_1_1">Consolidation Items [Axis]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_ConsolidationItemsAxis_lbl" xml:lang="en-US" id="id_10729326_2022117_2_1">Consolidation Items [Axis]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ConsolidationItemsAxis" xlink:to="us-gaap_ConsolidationItemsAxis_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ConsolidationItemsDomain" xlink:label="us-gaap_ConsolidationItemsDomain"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ConsolidationItemsDomain_lbl" xml:lang="en-US" id="id_10729326_2027981_1_1">Consolidation Items [Domain]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_ConsolidationItemsDomain_lbl" xml:lang="en-US" id="id_10729326_2027981_2_1">Consolidation Items [Domain]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ConsolidationItemsDomain" xlink:to="us-gaap_ConsolidationItemsDomain_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ConsolidationPolicyTextBlock" xlink:label="us-gaap_ConsolidationPolicyTextBlock"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ConsolidationPolicyTextBlock_lbl" xml:lang="en-US" id="id_10729326_2023415_1_1">Consolidation, Policy [Policy Text Block]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_ConsolidationPolicyTextBlock_lbl" xml:lang="en-US" id="id_10729326_2023415_2_1">Consolidations</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ConsolidationPolicyTextBlock" xlink:to="us-gaap_ConsolidationPolicyTextBlock_lbl"/>
    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_ConstructionRiskSolutionsLLCMember" xlink:label="ajg_ConstructionRiskSolutionsLLCMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_ConstructionRiskSolutionsLLCMember_lbl" xml:lang="en-US" id="id_10729326_2428351_3_1">Construction Risk Solutions, LLC (CRS).</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_ConstructionRiskSolutionsLLCMember_lbl" xml:lang="en-US" id="id_10729326_2428351_1_1">Construction Risk Solutions, LLC [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_ConstructionRiskSolutionsLLCMember_lbl" xml:lang="en-US" id="id_10729326_2428351_2_1">Construction Risk Solutions, LLC [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_ConstructionRiskSolutionsLLCMember" xlink:to="ajg_ConstructionRiskSolutionsLLCMember_lbl"/>
    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_ContingentCommissions" xlink:label="ajg_ContingentCommissions"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_ContingentCommissions_lbl" xml:lang="en-US" id="id_10729326_2362302_3_1">Contingent commissions</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_ContingentCommissions_lbl" xml:lang="en-US" id="id_10729326_2362302_1_1">Contingent Commissions</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_ContingentCommissions_lbl" xml:lang="en-US" id="id_10729326_2362302_2_1">Contingent commissions</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_ContingentCommissions" xlink:to="ajg_ContingentCommissions_lbl"/>
    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_ContractualObligationsMember" xlink:label="ajg_ContractualObligationsMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_ContractualObligationsMember_lbl" xml:lang="en-US" id="id_10729326_2082617_3_1">Contractual Obligations [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_ContractualObligationsMember_lbl" xml:lang="en-US" id="id_10729326_2082617_1_1">Contractual Obligations [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_ContractualObligationsMember_lbl" xml:lang="en-US" id="id_10729326_2082617_2_1">Total Contractual Obligations [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_ContractualObligationsMember" xlink:to="ajg_ContractualObligationsMember_lbl"/>
    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_ControllingInterestMember" xlink:label="ajg_ControllingInterestMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_ControllingInterestMember_lbl" xml:lang="en-US" id="id_10729326_2243334_3_1">Controlling Interest [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_ControllingInterestMember_lbl" xml:lang="en-US" id="id_10729326_2243334_1_1">Controlling Interest [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_ControllingInterestMember_lbl" xml:lang="en-US" id="id_10729326_2243334_2_1">Controlling Interest [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_ControllingInterestMember" xlink:to="ajg_ControllingInterestMember_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_CorporateMember" xlink:label="us-gaap_CorporateMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_CorporateMember_lbl" xml:lang="en-US" id="id_10729326_2022325_1_1">Corporate Segment [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_CorporateMember_lbl" xml:lang="en-US" id="id_10729326_2022325_2_1">Corporate [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CorporateMember" xlink:to="us-gaap_CorporateMember_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_CostOfCoalProductsAndServices" xlink:label="us-gaap_CostOfCoalProductsAndServices"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_CostOfCoalProductsAndServices_lbl" xml:lang="en-US" id="id_10729326_2021905_1_1">Cost of Coal Products and Services</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_CostOfCoalProductsAndServices_lbl" xml:lang="en-US" id="id_10729326_2021905_2_1">Cost of revenues from clean coal activities</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CostOfCoalProductsAndServices" xlink:to="us-gaap_CostOfCoalProductsAndServices_lbl"/>
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    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_CostsAndExpenses_lbl" xml:lang="en-US" id="id_10729326_2025799_1_1">Costs and Expenses</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_CostsAndExpenses_lbl" xml:lang="en-US" id="id_10729326_2025799_6_1">Total expenses</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CostsAndExpenses" xlink:to="us-gaap_CostsAndExpenses_lbl"/>
    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_CreditAgreementMember" xlink:label="ajg_CreditAgreementMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_CreditAgreementMember_lbl" xml:lang="en-US" id="id_10729326_2097126_3_1">Credit Agreement [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_CreditAgreementMember_lbl" xml:lang="en-US" id="id_10729326_2097126_1_1">Credit Agreement [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_CreditAgreementMember_lbl" xml:lang="en-US" id="id_10729326_2097126_2_1">Credit Agreement [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_CreditAgreementMember" xlink:to="ajg_CreditAgreementMember_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_CurrentFiscalYearEndDate" xlink:label="dei_CurrentFiscalYearEndDate"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_CurrentFiscalYearEndDate_lbl" xml:lang="en-US" id="id_10729326_2024507_1_1">Current Fiscal Year End Date</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="dei_CurrentFiscalYearEndDate_lbl" xml:lang="en-US" id="id_10729326_2024507_2_1">Current Fiscal Year End Date</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_CurrentFiscalYearEndDate" xlink:to="dei_CurrentFiscalYearEndDate_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DebtDisclosureAbstract" xlink:label="us-gaap_DebtDisclosureAbstract"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_DebtDisclosureAbstract_lbl" xml:lang="en-US" id="id_10729326_2026667_1_1">Debt Disclosure [Abstract]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_DebtDisclosureAbstract_lbl" xml:lang="en-US" id="id_10729326_2026667_2_1">Debt Disclosure [Abstract]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_DebtDisclosureAbstract" xlink:to="us-gaap_DebtDisclosureAbstract_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DebtDisclosureTextBlock" xlink:label="us-gaap_DebtDisclosureTextBlock"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_DebtDisclosureTextBlock_lbl" xml:lang="en-US" id="id_10729326_2022560_1_1">Debt Disclosure [Text Block]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_DebtDisclosureTextBlock_lbl" xml:lang="en-US" id="id_10729326_2022560_2_1">Credit and Other Debt Agreements</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_DebtDisclosureTextBlock" xlink:to="us-gaap_DebtDisclosureTextBlock_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DebtInstrumentAxis" xlink:label="us-gaap_DebtInstrumentAxis"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_DebtInstrumentAxis_lbl" xml:lang="en-US" id="id_10729326_2025588_1_1">Debt Instrument [Axis]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_DebtInstrumentAxis_lbl" xml:lang="en-US" id="id_10729326_2025588_2_1">Debt Instrument [Axis]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_DebtInstrumentAxis" xlink:to="us-gaap_DebtInstrumentAxis_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage" xlink:label="us-gaap_DebtInstrumentInterestRateStatedPercentage"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_DebtInstrumentInterestRateStatedPercentage_lbl" xml:lang="en-US" id="id_10729326_2022149_1_1">Debt Instrument, Interest Rate, Stated Percentage</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_DebtInstrumentInterestRateStatedPercentage_lbl" xml:lang="en-US" id="id_10729326_2022149_2_1">Periodic Payment of Interest</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_DebtInstrumentInterestRateStatedPercentage" xlink:to="us-gaap_DebtInstrumentInterestRateStatedPercentage_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DebtInstrumentLineItems" xlink:label="us-gaap_DebtInstrumentLineItems"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_DebtInstrumentLineItems_lbl" xml:lang="en-US" id="id_10729326_2021687_1_1">Debt Instrument [Line Items]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_DebtInstrumentLineItems_lbl" xml:lang="en-US" id="id_10729326_2021687_2_1">Debt Instrument [Line Items]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_DebtInstrumentLineItems" xlink:to="us-gaap_DebtInstrumentLineItems_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DebtInstrumentMaturityDate" xlink:label="us-gaap_DebtInstrumentMaturityDate"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_DebtInstrumentMaturityDate_lbl" xml:lang="en-US" id="id_10729326_2026454_1_1">Debt Instrument, Maturity Date</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_DebtInstrumentMaturityDate_lbl" xml:lang="en-US" id="id_10729326_2026454_2_1">Periodic payments of interest and principal, expiry date</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_DebtInstrumentMaturityDate" xlink:to="us-gaap_DebtInstrumentMaturityDate_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="us-gaap_DebtInstrumentNameDomain"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_DebtInstrumentNameDomain_lbl" xml:lang="en-US" id="id_10729326_2035345_1_1">Debt Instrument, Name [Domain]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_DebtInstrumentNameDomain_lbl" xml:lang="en-US" id="id_10729326_2035345_2_1">Debt Instrument, Name [Domain]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_DebtInstrumentNameDomain" xlink:to="us-gaap_DebtInstrumentNameDomain_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DebtInstrumentTable" xlink:label="us-gaap_DebtInstrumentTable"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_DebtInstrumentTable_lbl" xml:lang="en-US" id="id_10729326_2023206_1_1">Schedule of Long-term Debt Instruments [Table]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_DebtInstrumentTable_lbl" xml:lang="en-US" id="id_10729326_2023206_2_1">Schedule of Long-term Debt Instruments [Table]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_DebtInstrumentTable" xlink:to="us-gaap_DebtInstrumentTable_lbl"/>
    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_DebtObligationMember" xlink:label="ajg_DebtObligationMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_DebtObligationMember_lbl" xml:lang="en-US" id="id_10729326_2321878_3_1">Debt Obligation [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_DebtObligationMember_lbl" xml:lang="en-US" id="id_10729326_2321878_1_1">Debt Obligation [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_DebtObligationMember_lbl" xml:lang="en-US" id="id_10729326_2321878_2_1">Total Debt Obligations [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_DebtObligationMember" xlink:to="ajg_DebtObligationMember_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DebtSecurityAxis" xlink:label="us-gaap_DebtSecurityAxis"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_DebtSecurityAxis_lbl" xml:lang="en-US" id="id_10729326_2027999_1_1">Debt Security [Axis]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_DebtSecurityAxis_lbl" xml:lang="en-US" id="id_10729326_2027999_2_1">Debt Security [Axis]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_DebtSecurityAxis" xlink:to="us-gaap_DebtSecurityAxis_lbl"/>
    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_DeferredCashParticipationPlanMember" xlink:label="ajg_DeferredCashParticipationPlanMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_DeferredCashParticipationPlanMember_lbl" xml:lang="en-US" id="id_10729326_2080277_3_1">Deferred Cash Participation Plan [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_DeferredCashParticipationPlanMember_lbl" xml:lang="en-US" id="id_10729326_2080277_1_1">Deferred Cash Participation Plan [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_DeferredCashParticipationPlanMember_lbl" xml:lang="en-US" id="id_10729326_2080277_2_1">Deferred Cash Participation Plan (DCPP) [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_DeferredCashParticipationPlanMember" xlink:to="ajg_DeferredCashParticipationPlanMember_lbl"/>
    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_DeferredCompensationAndRestrictedStockExpensesBenefit" xlink:label="ajg_DeferredCompensationAndRestrictedStockExpensesBenefit"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_DeferredCompensationAndRestrictedStockExpensesBenefit_lbl" xml:lang="en-US" id="id_10729326_2391713_3_1">Deferred compensation and restricted stock expenses benefit.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_DeferredCompensationAndRestrictedStockExpensesBenefit_lbl" xml:lang="en-US" id="id_10729326_2391713_1_1">Deferred Compensation And Restricted Stock Expenses Benefit</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_DeferredCompensationAndRestrictedStockExpensesBenefit_lbl" xml:lang="en-US" id="id_10729326_2391713_2_1">Deferred compensation and restricted stock</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_DeferredCompensationAndRestrictedStockExpensesBenefit" xlink:to="ajg_DeferredCompensationAndRestrictedStockExpensesBenefit_lbl"/>
    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_DeferredCompensationAndRestrictedStockInShares" xlink:label="ajg_DeferredCompensationAndRestrictedStockInShares"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_DeferredCompensationAndRestrictedStockInShares_lbl" xml:lang="en-US" id="id_10729326_2240345_3_1">Deferred Compensation And Restricted Stock In Shares</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_DeferredCompensationAndRestrictedStockInShares_lbl" xml:lang="en-US" id="id_10729326_2240345_1_1">Deferred Compensation And Restricted Stock In Shares</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_DeferredCompensationAndRestrictedStockInShares_lbl" xml:lang="en-US" id="id_10729326_2240345_2_1">Deferred compensation and restricted stock (in shares)</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_DeferredCompensationAndRestrictedStockInShares" xlink:to="ajg_DeferredCompensationAndRestrictedStockInShares_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DeferredCostsCapitalizedPrepaidAndOtherAssetsDisclosureAbstract" xlink:label="us-gaap_DeferredCostsCapitalizedPrepaidAndOtherAssetsDisclosureAbstract"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_DeferredCostsCapitalizedPrepaidAndOtherAssetsDisclosureAbstract_lbl" xml:lang="en-US" id="id_10729326_2024736_1_1">Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_DeferredCostsCapitalizedPrepaidAndOtherAssetsDisclosureAbstract_lbl" xml:lang="en-US" id="id_10729326_2024736_2_1">Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_DeferredCostsCapitalizedPrepaidAndOtherAssetsDisclosureAbstract" xlink:to="us-gaap_DeferredCostsCapitalizedPrepaidAndOtherAssetsDisclosureAbstract_lbl"/>
    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_DeferredEquityParticipationPlanDistributionsToKeyExecutivesAge" xlink:label="ajg_DeferredEquityParticipationPlanDistributionsToKeyExecutivesAge"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_DeferredEquityParticipationPlanDistributionsToKeyExecutivesAge_lbl" xml:lang="en-US" id="id_10729326_2267282_3_1">Deferred Equity Participation Plan, Distributions to Key Executives, Age</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_DeferredEquityParticipationPlanDistributionsToKeyExecutivesAge_lbl" xml:lang="en-US" id="id_10729326_2267282_1_1">Deferred Equity Participation Plan Distributions To Key Executives Age</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_DeferredEquityParticipationPlanDistributionsToKeyExecutivesAge_lbl" xml:lang="en-US" id="id_10729326_2267282_2_1">Deferred Equity Participation Plan, distributions to key executives, age</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_DeferredEquityParticipationPlanDistributionsToKeyExecutivesAge" xlink:to="ajg_DeferredEquityParticipationPlanDistributionsToKeyExecutivesAge_lbl"/>
    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_DeferredEquityParticipationPlanMember" xlink:label="ajg_DeferredEquityParticipationPlanMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_DeferredEquityParticipationPlanMember_lbl" xml:lang="en-US" id="id_10729326_2391787_3_1">Deferred equity participation plan.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_DeferredEquityParticipationPlanMember_lbl" xml:lang="en-US" id="id_10729326_2391787_1_1">Deferred Equity Participation Plan [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_DeferredEquityParticipationPlanMember_lbl" xml:lang="en-US" id="id_10729326_2391787_2_1">Deferred Equity Participation Plan (DEPP) [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_DeferredEquityParticipationPlanMember" xlink:to="ajg_DeferredEquityParticipationPlanMember_lbl"/>
    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_DeferredEquityParticipationPlanSubPlansMember" xlink:label="ajg_DeferredEquityParticipationPlanSubPlansMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_DeferredEquityParticipationPlanSubPlansMember_lbl" xml:lang="en-US" id="id_10729326_2391785_3_1">Deferred equity participation plan sub plans.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_DeferredEquityParticipationPlanSubPlansMember_lbl" xml:lang="en-US" id="id_10729326_2391785_1_1">Deferred Equity Participation Plan Sub Plans [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_DeferredEquityParticipationPlanSubPlansMember_lbl" xml:lang="en-US" id="id_10729326_2391785_2_1">Deferred Equity Participation Plan Sub Plans [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_DeferredEquityParticipationPlanSubPlansMember" xlink:to="ajg_DeferredEquityParticipationPlanSubPlansMember_lbl"/>
    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_DeferredEquityParticipationSubPlanDistributionsRequisiteServiceDescription" xlink:label="ajg_DeferredEquityParticipationSubPlanDistributionsRequisiteServiceDescription"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_DeferredEquityParticipationSubPlanDistributionsRequisiteServiceDescription_lbl" xml:lang="en-US" id="id_10729326_2391795_3_1">Deferred equity participation sub plan distributions requisite service description.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_DeferredEquityParticipationSubPlanDistributionsRequisiteServiceDescription_lbl" xml:lang="en-US" id="id_10729326_2391795_1_1">Deferred Equity Participation Sub Plan Distributions Requisite Service Description</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_DeferredEquityParticipationSubPlanDistributionsRequisiteServiceDescription_lbl" xml:lang="en-US" id="id_10729326_2391795_2_1">Deferred Equity Participation Sub-plans, distributions requisite service description</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_DeferredEquityParticipationSubPlanDistributionsRequisiteServiceDescription" xlink:to="ajg_DeferredEquityParticipationSubPlanDistributionsRequisiteServiceDescription_lbl"/>
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    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_DerivativeLiabilityNotionalAmount_lbl" xml:lang="en-US" id="id_10729326_2026259_2_1">Derivative Liabilities</label>
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    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_DerivativeNetHedgeIneffectivenessGainLoss_lbl" xml:lang="en-US" id="id_10729326_2026260_1_1">Derivative, Net Hedge Ineffectiveness Gain (Loss)</label>
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    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_DerivativeNetHedgeIneffectivenessGainLoss" xlink:to="us-gaap_DerivativeNetHedgeIneffectivenessGainLoss_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/invest/2013/invest-2013-01-31.xsd#invest_DerivativeNotionalAmount" xlink:label="invest_DerivativeNotionalAmount"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="invest_DerivativeNotionalAmount_lbl" xml:lang="en-US" id="id_10729326_2024990_1_1">Derivative, Notional Amount</label>
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    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DerivativesFairValueLineItems" xlink:label="us-gaap_DerivativesFairValueLineItems"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_DerivativesFairValueLineItems_lbl" xml:lang="en-US" id="id_10729326_2026711_1_1">Derivatives, Fair Value [Line Items]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_DerivativesFairValueLineItems_lbl" xml:lang="en-US" id="id_10729326_2026711_2_1">Derivatives, Fair Value [Line Items]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_DerivativesFairValueLineItems" xlink:to="us-gaap_DerivativesFairValueLineItems_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract" xlink:label="us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract_lbl" xml:lang="en-US" id="id_10729326_2026720_1_1">Disclosure of Compensation Related Costs, Share-based Payments [Abstract]</label>
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    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DividendsCommonStockCash" xlink:label="us-gaap_DividendsCommonStockCash"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_DividendsCommonStockCash_lbl" xml:lang="en-US" id="id_10729326_2027154_1_1">Dividends, Common Stock, Cash</label>
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    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_DividendsCommonStockCash" xlink:to="us-gaap_DividendsCommonStockCash_lbl"/>
    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_DocumentAndEntityInformationAbstract" xlink:label="ajg_DocumentAndEntityInformationAbstract"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_DocumentAndEntityInformationAbstract_lbl" xml:lang="en-US" id="id_10729326_2260742_3_1">Document and Entity Information [Abstract]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_DocumentAndEntityInformationAbstract_lbl" xml:lang="en-US" id="id_10729326_2260742_1_1">Document And Entity Information [Abstract]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_DocumentAndEntityInformationAbstract_lbl" xml:lang="en-US" id="id_10729326_2260742_2_1">Document And Entity Information [Abstract]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_DocumentAndEntityInformationAbstract" xlink:to="ajg_DocumentAndEntityInformationAbstract_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_DocumentFiscalPeriodFocus" xlink:label="dei_DocumentFiscalPeriodFocus"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_DocumentFiscalPeriodFocus_lbl" xml:lang="en-US" id="id_10729326_2025647_1_1">Document Fiscal Period Focus</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="dei_DocumentFiscalPeriodFocus_lbl" xml:lang="en-US" id="id_10729326_2025647_2_1">Document Fiscal Period Focus</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_DocumentFiscalPeriodFocus" xlink:to="dei_DocumentFiscalPeriodFocus_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_DocumentFiscalYearFocus" xlink:label="dei_DocumentFiscalYearFocus"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_DocumentFiscalYearFocus_lbl" xml:lang="en-US" id="id_10729326_2024142_1_1">Document Fiscal Year Focus</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="dei_DocumentFiscalYearFocus_lbl" xml:lang="en-US" id="id_10729326_2024142_2_1">Document Fiscal Year Focus</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_DocumentFiscalYearFocus" xlink:to="dei_DocumentFiscalYearFocus_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_DocumentPeriodEndDate" xlink:label="dei_DocumentPeriodEndDate"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_DocumentPeriodEndDate_lbl" xml:lang="en-US" id="id_10729326_2023078_1_1">Document Period End Date</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="dei_DocumentPeriodEndDate_lbl" xml:lang="en-US" id="id_10729326_2023078_2_1">Document Period End Date</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_DocumentPeriodEndDate" xlink:to="dei_DocumentPeriodEndDate_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_DocumentType" xlink:label="dei_DocumentType"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_DocumentType_lbl" xml:lang="en-US" id="id_10729326_2022383_1_1">Document Type</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="dei_DocumentType_lbl" xml:lang="en-US" id="id_10729326_2022383_2_1">Document Type</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_DocumentType" xlink:to="dei_DocumentType_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_EarningsPerShareAbstract" xlink:label="us-gaap_EarningsPerShareAbstract"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_EarningsPerShareAbstract_lbl" xml:lang="en-US" id="id_10729326_2022611_1_1">Earnings Per Share [Abstract]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_EarningsPerShareAbstract_lbl" xml:lang="en-US" id="id_10729326_2022611_2_1">Earnings Per Share [Abstract]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_EarningsPerShareAbstract" xlink:to="us-gaap_EarningsPerShareAbstract_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_EarningsPerShareBasic" xlink:label="us-gaap_EarningsPerShareBasic"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_EarningsPerShareBasic_lbl" xml:lang="en-US" id="id_10729326_2024783_1_1">Earnings Per Share, Basic</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_EarningsPerShareBasic_lbl" xml:lang="en-US" id="id_10729326_2024783_2_1">Basic net earnings per share</label>
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    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_EarningsPerShareDiluted_lbl" xml:lang="en-US" id="id_10729326_2025654_1_1">Earnings Per Share, Diluted</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_EarningsPerShareDiluted_lbl" xml:lang="en-US" id="id_10729326_2025654_2_1">Diluted net earnings per share</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_EarningsPerShareDiluted_lbl" xml:lang="en-US" id="id_10729326_2025654_12_1">Diluted net earnings per share:</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_EarningsPerShareDiluted" xlink:to="us-gaap_EarningsPerShareDiluted_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_EarningsPerShareTextBlock" xlink:label="us-gaap_EarningsPerShareTextBlock"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_EarningsPerShareTextBlock_lbl" xml:lang="en-US" id="id_10729326_2027799_1_1">Earnings Per Share [Text Block]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_EarningsPerShareTextBlock_lbl" xml:lang="en-US" id="id_10729326_2027799_2_1">Earnings Per Share</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_EarningsPerShareTextBlock" xlink:to="us-gaap_EarningsPerShareTextBlock_lbl"/>
    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_EarnoutPaymentsForAcquisitions" xlink:label="ajg_EarnoutPaymentsForAcquisitions"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_EarnoutPaymentsForAcquisitions_lbl" xml:lang="en-US" id="id_10729326_2110357_3_1">Earnout payments for acquisitions.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_EarnoutPaymentsForAcquisitions_lbl" xml:lang="en-US" id="id_10729326_2110357_1_1">Earnout Payments For Acquisitions</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="ajg_EarnoutPaymentsForAcquisitions_lbl" xml:lang="en-US" id="id_10729326_2110357_14_1">Payments on acquisition earnouts</label>
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    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents" xlink:label="us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents_lbl" xml:lang="en-US" id="id_10729326_2023673_1_1">Effect of Exchange Rate on Cash and Cash Equivalents</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents_lbl" xml:lang="en-US" id="id_10729326_2023673_2_1">Effect of changes in foreign exchange rates on cash and cash equivalents</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents" xlink:to="us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized" xlink:label="us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_lbl" xml:lang="en-US" id="id_10729326_2024350_1_1">Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_lbl" xml:lang="en-US" id="id_10729326_2024350_2_1">Total unrecognized compensation cost related to nonvested options</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized" xlink:to="us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityCentralIndexKey" xlink:label="dei_EntityCentralIndexKey"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_EntityCentralIndexKey_lbl" xml:lang="en-US" id="id_10729326_2022397_1_1">Entity Central Index Key</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="dei_EntityCentralIndexKey_lbl" xml:lang="en-US" id="id_10729326_2022397_2_1">Entity Central Index Key</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_EntityCentralIndexKey" xlink:to="dei_EntityCentralIndexKey_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityCommonStockSharesOutstanding" xlink:label="dei_EntityCommonStockSharesOutstanding"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_EntityCommonStockSharesOutstanding_lbl" xml:lang="en-US" id="id_10729326_2025882_1_1">Entity Common Stock, Shares Outstanding</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="dei_EntityCommonStockSharesOutstanding_lbl" xml:lang="en-US" id="id_10729326_2025882_2_1">Entity Common Stock, Shares Outstanding</label>
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    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityFilerCategory" xlink:label="dei_EntityFilerCategory"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_EntityFilerCategory_lbl" xml:lang="en-US" id="id_10729326_2025883_1_1">Entity Filer Category</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="dei_EntityFilerCategory_lbl" xml:lang="en-US" id="id_10729326_2025883_2_1">Entity Filer Category</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_EntityFilerCategory" xlink:to="dei_EntityFilerCategory_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityRegistrantName" xlink:label="dei_EntityRegistrantName"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_EntityRegistrantName_lbl" xml:lang="en-US" id="id_10729326_2021744_1_1">Entity Registrant Name</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="dei_EntityRegistrantName_lbl" xml:lang="en-US" id="id_10729326_2021744_2_1">Entity Registrant Name</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_EntityRegistrantName" xlink:to="dei_EntityRegistrantName_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_EquityAbstract" xlink:label="us-gaap_EquityAbstract"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_EquityAbstract_lbl" xml:lang="en-US" id="id_10729326_2025026_1_1">Equity [Abstract]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_EquityAbstract_lbl" xml:lang="en-US" id="id_10729326_2025026_2_1">Equity [Abstract]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_EquityAbstract" xlink:to="us-gaap_EquityAbstract_lbl"/>
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    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_EquityMethodInvestmentSummarizedFinancialInformationFundingCommitments_lbl" xml:lang="en-US" id="id_10729326_2063113_3_1">Equity Method Investment Summarized Financial Information Funding Commitments</label>
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    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_ErrorsAndOmissionsMember" xlink:label="ajg_ErrorsAndOmissionsMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_ErrorsAndOmissionsMember_lbl" xml:lang="en-US" id="id_10729326_2225337_3_1">Errors and Omissions [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_ErrorsAndOmissionsMember_lbl" xml:lang="en-US" id="id_10729326_2225337_1_1">Errors And Omissions [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_ErrorsAndOmissionsMember_lbl" xml:lang="en-US" id="id_10729326_2225337_2_1">Errors and Omissions [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_ErrorsAndOmissionsMember" xlink:to="ajg_ErrorsAndOmissionsMember_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_EscrowDeposit" xlink:label="us-gaap_EscrowDeposit"/>
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    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_EstimatedAggregateAmortizationExpenseTableTextBlock_lbl" xml:lang="en-US" id="id_10729326_2391725_3_1">Estimated Aggregate Amortization Expense</label>
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    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_ExpirationListsMember_lbl" xml:lang="en-US" id="id_10729326_2170936_3_1">Expiration Lists [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_ExpirationListsMember_lbl" xml:lang="en-US" id="id_10729326_2170936_1_1">Expiration Lists [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_ExpirationListsMember_lbl" xml:lang="en-US" id="id_10729326_2170936_2_1">Expiration Lists [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_ExpirationListsMember" xlink:to="ajg_ExpirationListsMember_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ExtinguishmentOfDebtAxis" xlink:label="us-gaap_ExtinguishmentOfDebtAxis"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ExtinguishmentOfDebtAxis_lbl" xml:lang="en-US" id="id_10729326_2027416_1_1">Extinguishment of Debt [Axis]</label>
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    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_FacilityAndFacilityMember_lbl" xml:lang="en-US" id="id_10729326_2126642_3_1">Facility C And Facility D [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_FacilityAndFacilityMember_lbl" xml:lang="en-US" id="id_10729326_2126642_1_1">Facility C And Facility D [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_FacilityAndFacilityMember_lbl" xml:lang="en-US" id="id_10729326_2126642_2_1">Facility C and D [Member]</label>
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    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_FacilityBMember_lbl" xml:lang="en-US" id="id_10729326_2124529_3_1">Facility B [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_FacilityBMember_lbl" xml:lang="en-US" id="id_10729326_2124529_1_1">Facility B [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_FacilityBMember_lbl" xml:lang="en-US" id="id_10729326_2124529_2_1">Facility B [Member]</label>
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    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_FairValueInputsLongTermRevenueGrowthRate" xlink:label="us-gaap_FairValueInputsLongTermRevenueGrowthRate"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_FairValueInputsLongTermRevenueGrowthRate_lbl" xml:lang="en-US" id="id_10729326_2021531_1_1">Fair Value Inputs, Long-term Revenue Growth Rate</label>
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    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_lbl" xml:lang="en-US" id="id_10729326_2024374_2_1">Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table]</label>
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    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_FinancialGuaranteeMember" xlink:label="us-gaap_FinancialGuaranteeMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_FinancialGuaranteeMember_lbl" xml:lang="en-US" id="id_10729326_2026562_1_1">Financial Guarantee [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_FinancialGuaranteeMember_lbl" xml:lang="en-US" id="id_10729326_2026562_2_1">Financial Guarantees [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_FinancialGuaranteeMember" xlink:to="us-gaap_FinancialGuaranteeMember_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_FinancialInstrumentAxis" xlink:label="us-gaap_FinancialInstrumentAxis"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_FinancialInstrumentAxis_lbl" xml:lang="en-US" id="id_10729326_2026789_1_1">Financial Instrument [Axis]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_FinancialInstrumentAxis_lbl" xml:lang="en-US" id="id_10729326_2026789_2_1">Financial Instrument [Axis]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_FinancialInstrumentAxis" xlink:to="us-gaap_FinancialInstrumentAxis_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization" xlink:label="us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_lbl" xml:lang="en-US" id="id_10729326_2029393_1_1">Finite-Lived Intangible Assets, Accumulated Amortization</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_lbl" xml:lang="en-US" id="id_10729326_2029393_14_1">Accumulated amortization</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization" xlink:to="us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear" xlink:label="us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear_lbl" xml:lang="en-US" id="id_10729326_2025929_1_1">Finite-Lived Intangible Assets, Amortization Expense, Remainder of Fiscal Year</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear_lbl" xml:lang="en-US" id="id_10729326_2025929_2_1">2017 (remaining nine months)</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear" xlink:to="us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive" xlink:label="us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive_lbl" xml:lang="en-US" id="id_10729326_2026354_1_1">Finite-Lived Intangible Assets, Amortization Expense, Year Five</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive_lbl" xml:lang="en-US" id="id_10729326_2026354_2_1">2021</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive" xlink:to="us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour" xlink:label="us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour_lbl" xml:lang="en-US" id="id_10729326_2025281_1_1">Finite-Lived Intangible Assets, Amortization Expense, Year Four</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour_lbl" xml:lang="en-US" id="id_10729326_2025281_2_1">2020</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour" xlink:to="us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree" xlink:label="us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree_lbl" xml:lang="en-US" id="id_10729326_2023313_1_1">Finite-Lived Intangible Assets, Amortization Expense, Year Three</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree_lbl" xml:lang="en-US" id="id_10729326_2023313_2_1">2019</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree" xlink:to="us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo" xlink:label="us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo_lbl" xml:lang="en-US" id="id_10729326_2023314_1_1">Finite-Lived Intangible Assets, Amortization Expense, Year Two</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo_lbl" xml:lang="en-US" id="id_10729326_2023314_2_1">2018</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo" xlink:to="us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis" xlink:label="us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_lbl" xml:lang="en-US" id="id_10729326_2035448_1_1">Finite-Lived Intangible Assets by Major Class [Axis]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_lbl" xml:lang="en-US" id="id_10729326_2035448_2_1">Finite-Lived Intangible Assets by Major Class [Axis]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis" xlink:to="us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsGross" xlink:label="us-gaap_FiniteLivedIntangibleAssetsGross"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_FiniteLivedIntangibleAssetsGross_lbl" xml:lang="en-US" id="id_10729326_2021793_1_1">Finite-Lived Intangible Assets, Gross</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_FiniteLivedIntangibleAssetsGross_lbl" xml:lang="en-US" id="id_10729326_2021793_2_1">Amortizable intangible assets, gross</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_FiniteLivedIntangibleAssetsGross" xlink:to="us-gaap_FiniteLivedIntangibleAssetsGross_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsLineItems" xlink:label="us-gaap_FiniteLivedIntangibleAssetsLineItems"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_FiniteLivedIntangibleAssetsLineItems_lbl" xml:lang="en-US" id="id_10729326_2024610_1_1">Finite-Lived Intangible Assets [Line Items]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_FiniteLivedIntangibleAssetsLineItems_lbl" xml:lang="en-US" id="id_10729326_2024610_2_1">Finite-Lived Intangible Assets [Line Items]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_FiniteLivedIntangibleAssetsLineItems" xlink:to="us-gaap_FiniteLivedIntangibleAssetsLineItems_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain" xlink:label="us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_lbl" xml:lang="en-US" id="id_10729326_2027645_1_1">Finite-Lived Intangible Assets, Major Class Name [Domain]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_lbl" xml:lang="en-US" id="id_10729326_2027645_2_1">Finite-Lived Intangible Assets, Major Class Name [Domain]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain" xlink:to="us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetUsefulLife" xlink:label="us-gaap_FiniteLivedIntangibleAssetUsefulLife"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_FiniteLivedIntangibleAssetUsefulLife_lbl" xml:lang="en-US" id="id_10729326_2034841_1_1">Finite-Lived Intangible Asset, Useful Life</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_FiniteLivedIntangibleAssetUsefulLife_lbl" xml:lang="en-US" id="id_10729326_2034841_2_1">Estimated useful lives of intangibles assets, years</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_FiniteLivedIntangibleAssetUsefulLife" xlink:to="us-gaap_FiniteLivedIntangibleAssetUsefulLife_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_FiniteLivedNoncompeteAgreementsGross" xlink:label="us-gaap_FiniteLivedNoncompeteAgreementsGross"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_FiniteLivedNoncompeteAgreementsGross_lbl" xml:lang="en-US" id="id_10729326_2027873_1_1">Finite-Lived Noncompete Agreements, Gross</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_FiniteLivedNoncompeteAgreementsGross_lbl" xml:lang="en-US" id="id_10729326_2027873_2_1">Non-compete agreements</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_FiniteLivedNoncompeteAgreementsGross" xlink:to="us-gaap_FiniteLivedNoncompeteAgreementsGross_lbl"/>
    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_FirstInstallmentMember" xlink:label="ajg_FirstInstallmentMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_FirstInstallmentMember_lbl" xml:lang="en-US" id="id_10729326_2066271_3_1">First Installment [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_FirstInstallmentMember_lbl" xml:lang="en-US" id="id_10729326_2066271_1_1">First Installment [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_FirstInstallmentMember_lbl" xml:lang="en-US" id="id_10729326_2066271_2_1">First Installment [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_FirstInstallmentMember" xlink:to="ajg_FirstInstallmentMember_lbl"/>
    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_FixedRateOfFivePointEightFivePercentFiftyMillionDollarsDueNovemberThirtyTwoThousandEighteenAndNovemberThirtyTwoThousandNineteenMember" xlink:label="ajg_FixedRateOfFivePointEightFivePercentFiftyMillionDollarsDueNovemberThirtyTwoThousandEighteenAndNovemberThirtyTwoThousandNineteenMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_FixedRateOfFivePointEightFivePercentFiftyMillionDollarsDueNovemberThirtyTwoThousandEighteenAndNovemberThirtyTwoThousandNineteenMember_lbl" xml:lang="en-US" id="id_10729326_2429275_3_1">Fixed rate of five point eight five percent fifty million dollars due November thirty two thousand eighteen and November thirty two thousand nineteen.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_FixedRateOfFivePointEightFivePercentFiftyMillionDollarsDueNovemberThirtyTwoThousandEighteenAndNovemberThirtyTwoThousandNineteenMember_lbl" xml:lang="en-US" id="id_10729326_2429275_1_1">Fixed Rate Of Five Point Eight Five Percent Fifty Million Dollars Due November Thirty Two Thousand Eighteen And November Thirty Two Thousand Nineteen [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_FixedRateOfFivePointEightFivePercentFiftyMillionDollarsDueNovemberThirtyTwoThousandEighteenAndNovemberThirtyTwoThousandNineteenMember_lbl" xml:lang="en-US" id="id_10729326_2429275_2_1">Fixed Rate of 5.85%, $50 Million Due November 30, 2018 and November 30, 2019 [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_FixedRateOfFivePointEightFivePercentFiftyMillionDollarsDueNovemberThirtyTwoThousandEighteenAndNovemberThirtyTwoThousandNineteenMember" xlink:to="ajg_FixedRateOfFivePointEightFivePercentFiftyMillionDollarsDueNovemberThirtyTwoThousandEighteenAndNovemberThirtyTwoThousandNineteenMember_lbl"/>
    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_FixedRateOfFivePointFourNinePercentBalloonDueFebruaryTenTwoThousandTwentyThreeMember" xlink:label="ajg_FixedRateOfFivePointFourNinePercentBalloonDueFebruaryTenTwoThousandTwentyThreeMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_FixedRateOfFivePointFourNinePercentBalloonDueFebruaryTenTwoThousandTwentyThreeMember_lbl" xml:lang="en-US" id="id_10729326_2429284_3_1">Fixed rate of five point four nine percent, balloon due February ten, two thousand twenty three.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_FixedRateOfFivePointFourNinePercentBalloonDueFebruaryTenTwoThousandTwentyThreeMember_lbl" xml:lang="en-US" id="id_10729326_2429284_1_1">Fixed Rate Of Five Point Four Nine Percent Balloon Due February Ten Two Thousand Twenty Three [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_FixedRateOfFivePointFourNinePercentBalloonDueFebruaryTenTwoThousandTwentyThreeMember_lbl" xml:lang="en-US" id="id_10729326_2429284_2_1">Fixed Rate of 5.49%, Balloon Due February 10, 2023 [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_FixedRateOfFivePointFourNinePercentBalloonDueFebruaryTenTwoThousandTwentyThreeMember" xlink:to="ajg_FixedRateOfFivePointFourNinePercentBalloonDueFebruaryTenTwoThousandTwentyThreeMember_lbl"/>
    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_FixedRateOfFivePointOneEightPercentBalloonDueFebruaryTenTwoThousandTwentyOneMember" xlink:label="ajg_FixedRateOfFivePointOneEightPercentBalloonDueFebruaryTenTwoThousandTwentyOneMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_FixedRateOfFivePointOneEightPercentBalloonDueFebruaryTenTwoThousandTwentyOneMember_lbl" xml:lang="en-US" id="id_10729326_2429282_3_1">Fixed Rate Of Five Point One Eight Percent Balloon Due February Ten Two Thousand Twenty One [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_FixedRateOfFivePointOneEightPercentBalloonDueFebruaryTenTwoThousandTwentyOneMember_lbl" xml:lang="en-US" id="id_10729326_2429282_1_1">Fixed Rate Of Five Point One Eight Percent Balloon Due February Ten Two Thousand Twenty One [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_FixedRateOfFivePointOneEightPercentBalloonDueFebruaryTenTwoThousandTwentyOneMember_lbl" xml:lang="en-US" id="id_10729326_2429282_2_1">Fixed Rate of 5.18%, Balloon Due February 10, 2021 [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_FixedRateOfFivePointOneEightPercentBalloonDueFebruaryTenTwoThousandTwentyOneMember" xlink:to="ajg_FixedRateOfFivePointOneEightPercentBalloonDueFebruaryTenTwoThousandTwentyOneMember_lbl"/>
    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_FixedRateOfFourPointFiveEightPercentBalloonDueFebruaryTwentySevenTwoThousandTwentyFourMember" xlink:label="ajg_FixedRateOfFourPointFiveEightPercentBalloonDueFebruaryTwentySevenTwoThousandTwentyFourMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_FixedRateOfFourPointFiveEightPercentBalloonDueFebruaryTwentySevenTwoThousandTwentyFourMember_lbl" xml:lang="en-US" id="id_10729326_2429286_3_1">Fixed rate of four point five eight percent, balloon due February twenty seven, two thousand twenty four.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_FixedRateOfFourPointFiveEightPercentBalloonDueFebruaryTwentySevenTwoThousandTwentyFourMember_lbl" xml:lang="en-US" id="id_10729326_2429286_1_1">Fixed Rate Of Four Point Five Eight Percent Balloon Due February Twenty Seven Two Thousand Twenty Four [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_FixedRateOfFourPointFiveEightPercentBalloonDueFebruaryTwentySevenTwoThousandTwentyFourMember_lbl" xml:lang="en-US" id="id_10729326_2429286_2_1">Fixed Rate of 4.58%, Balloon Due February 27, 2024 [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_FixedRateOfFourPointFiveEightPercentBalloonDueFebruaryTwentySevenTwoThousandTwentyFourMember" xlink:to="ajg_FixedRateOfFourPointFiveEightPercentBalloonDueFebruaryTwentySevenTwoThousandTwentyFourMember_lbl"/>
    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_FixedRateOfFourPointFiveFivePercentBalloonDueJuneTwoTwoThousandTwentyEightMember" xlink:label="ajg_FixedRateOfFourPointFiveFivePercentBalloonDueJuneTwoTwoThousandTwentyEightMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_FixedRateOfFourPointFiveFivePercentBalloonDueJuneTwoTwoThousandTwentyEightMember_lbl" xml:lang="en-US" id="id_10729326_2429290_3_1">Fixed rate of four point five five, percent balloon due June two, two thousand twenty eight.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_FixedRateOfFourPointFiveFivePercentBalloonDueJuneTwoTwoThousandTwentyEightMember_lbl" xml:lang="en-US" id="id_10729326_2429290_1_1">Fixed Rate Of Four Point Five Five Percent Balloon Due June Two Two Thousand Twenty Eight [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_FixedRateOfFourPointFiveFivePercentBalloonDueJuneTwoTwoThousandTwentyEightMember_lbl" xml:lang="en-US" id="id_10729326_2429290_2_1">Fixed Rate of 4.55%, Balloon Due June 2, 2028 [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_FixedRateOfFourPointFiveFivePercentBalloonDueJuneTwoTwoThousandTwentyEightMember" xlink:to="ajg_FixedRateOfFourPointFiveFivePercentBalloonDueJuneTwoTwoThousandTwentyEightMember_lbl"/>
    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_FixedRateOfFourPointFourZeroPercentBalloonDueJuneTwoTwoThousandTwentySixMember" xlink:label="ajg_FixedRateOfFourPointFourZeroPercentBalloonDueJuneTwoTwoThousandTwentySixMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_FixedRateOfFourPointFourZeroPercentBalloonDueJuneTwoTwoThousandTwentySixMember_lbl" xml:lang="en-US" id="id_10729326_2429292_3_1">Fixed rate of four point four zero, percent balloon due June two, two thousand twenty six.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_FixedRateOfFourPointFourZeroPercentBalloonDueJuneTwoTwoThousandTwentySixMember_lbl" xml:lang="en-US" id="id_10729326_2429292_1_1">Fixed Rate Of Four Point Four Zero Percent Balloon Due June Two Two Thousand Twenty Six [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_FixedRateOfFourPointFourZeroPercentBalloonDueJuneTwoTwoThousandTwentySixMember_lbl" xml:lang="en-US" id="id_10729326_2429292_2_1">Fixed Rate of 4.40%, Balloon Due June 2, 2026 [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_FixedRateOfFourPointFourZeroPercentBalloonDueJuneTwoTwoThousandTwentySixMember" xlink:to="ajg_FixedRateOfFourPointFourZeroPercentBalloonDueJuneTwoTwoThousandTwentySixMember_lbl"/>
    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_FixedRateOfFourPointNineEightPercentBalloonDueFebruaryTwentySevenTwoThousandTwentyNineMember" xlink:label="ajg_FixedRateOfFourPointNineEightPercentBalloonDueFebruaryTwentySevenTwoThousandTwentyNineMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_FixedRateOfFourPointNineEightPercentBalloonDueFebruaryTwentySevenTwoThousandTwentyNineMember_lbl" xml:lang="en-US" id="id_10729326_2429289_3_1">Fixed rate of four point nine eight percent, balloon due February twenty seven, two thousand twenty nine.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_FixedRateOfFourPointNineEightPercentBalloonDueFebruaryTwentySevenTwoThousandTwentyNineMember_lbl" xml:lang="en-US" id="id_10729326_2429289_1_1">Fixed Rate Of Four Point Nine Eight Percent Balloon Due February Twenty Seven Two Thousand Twenty Nine [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_FixedRateOfFourPointNineEightPercentBalloonDueFebruaryTwentySevenTwoThousandTwentyNineMember_lbl" xml:lang="en-US" id="id_10729326_2429289_2_1">Fixed Rate of 4.98%, Balloon Due February 27, 2029 [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_FixedRateOfFourPointNineEightPercentBalloonDueFebruaryTwentySevenTwoThousandTwentyNineMember" xlink:to="ajg_FixedRateOfFourPointNineEightPercentBalloonDueFebruaryTwentySevenTwoThousandTwentyNineMember_lbl"/>
    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_FixedRateOfFourPointOneThreePercentageBalloonDueJuneTwentyFourTwoThousandTwentyThreeMember" xlink:label="ajg_FixedRateOfFourPointOneThreePercentageBalloonDueJuneTwentyFourTwoThousandTwentyThreeMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_FixedRateOfFourPointOneThreePercentageBalloonDueJuneTwentyFourTwoThousandTwentyThreeMember_lbl" xml:lang="en-US" id="id_10729326_2429285_3_1">Fixed Rate Of Four Point One Three Percentage Balloon Due June Twenty Four Two Thousand Twenty Three [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_FixedRateOfFourPointOneThreePercentageBalloonDueJuneTwentyFourTwoThousandTwentyThreeMember_lbl" xml:lang="en-US" id="id_10729326_2429285_1_1">Fixed Rate Of Four Point One Three Percentage Balloon Due June Twenty Four Two Thousand Twenty Three [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_FixedRateOfFourPointOneThreePercentageBalloonDueJuneTwentyFourTwoThousandTwentyThreeMember_lbl" xml:lang="en-US" id="id_10729326_2429285_2_1">Fixed Rate of 4.13%, Balloon Due June 24, 2023 [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_FixedRateOfFourPointOneThreePercentageBalloonDueJuneTwentyFourTwoThousandTwentyThreeMember" xlink:to="ajg_FixedRateOfFourPointOneThreePercentageBalloonDueJuneTwentyFourTwoThousandTwentyThreeMember_lbl"/>
    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_FixedRateOfFourPointSevenThreePercentBalloonDueFebruaryTwentySevenTwoThousandTwentySixMember" xlink:label="ajg_FixedRateOfFourPointSevenThreePercentBalloonDueFebruaryTwentySevenTwoThousandTwentySixMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_FixedRateOfFourPointSevenThreePercentBalloonDueFebruaryTwentySevenTwoThousandTwentySixMember_lbl" xml:lang="en-US" id="id_10729326_2429294_3_1">Fixed rate of four point seven three, percent balloon due February twenty seven, two thousand twenty six.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_FixedRateOfFourPointSevenThreePercentBalloonDueFebruaryTwentySevenTwoThousandTwentySixMember_lbl" xml:lang="en-US" id="id_10729326_2429294_1_1">Fixed Rate Of Four Point Seven Three Percent Balloon Due February Twenty Seven Two Thousand Twenty Six [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_FixedRateOfFourPointSevenThreePercentBalloonDueFebruaryTwentySevenTwoThousandTwentySixMember_lbl" xml:lang="en-US" id="id_10729326_2429294_2_1">Fixed Rate of 4.73%, Balloon Due February 27, 2026 [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_FixedRateOfFourPointSevenThreePercentBalloonDueFebruaryTwentySevenTwoThousandTwentySixMember" xlink:to="ajg_FixedRateOfFourPointSevenThreePercentBalloonDueFebruaryTwentySevenTwoThousandTwentySixMember_lbl"/>
    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_FixedRateOfFourPointSevenZeroPercentBalloonDueJuneTwoTwoThousandThirtyOneMember" xlink:label="ajg_FixedRateOfFourPointSevenZeroPercentBalloonDueJuneTwoTwoThousandThirtyOneMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_FixedRateOfFourPointSevenZeroPercentBalloonDueJuneTwoTwoThousandThirtyOneMember_lbl" xml:lang="en-US" id="id_10729326_2429288_3_1">Fixed rate of four point seven zero percent, balloon due June two, two thousand thirty one.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_FixedRateOfFourPointSevenZeroPercentBalloonDueJuneTwoTwoThousandThirtyOneMember_lbl" xml:lang="en-US" id="id_10729326_2429288_1_1">Fixed Rate Of Four Point Seven Zero Percent Balloon Due June Two Two Thousand Thirty One [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_FixedRateOfFourPointSevenZeroPercentBalloonDueJuneTwoTwoThousandThirtyOneMember_lbl" xml:lang="en-US" id="id_10729326_2429288_2_1">Fixed Rate of 4.70%, Balloon Due June 2, 2031 [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_FixedRateOfFourPointSevenZeroPercentBalloonDueJuneTwoTwoThousandThirtyOneMember" xlink:to="ajg_FixedRateOfFourPointSevenZeroPercentBalloonDueJuneTwoTwoThousandThirtyOneMember_lbl"/>
    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_FixedRateOfFourPointThreeOnePercentBalloonDueJuneTwentyFourTwoThousandTwentyFiveMember" xlink:label="ajg_FixedRateOfFourPointThreeOnePercentBalloonDueJuneTwentyFourTwoThousandTwentyFiveMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_FixedRateOfFourPointThreeOnePercentBalloonDueJuneTwentyFourTwoThousandTwentyFiveMember_lbl" xml:lang="en-US" id="id_10729326_2429287_3_1">Fixed rate of four point three one percent, balloon due June twenty four, two thousand twenty five.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_FixedRateOfFourPointThreeOnePercentBalloonDueJuneTwentyFourTwoThousandTwentyFiveMember_lbl" xml:lang="en-US" id="id_10729326_2429287_1_1">Fixed Rate Of Four Point Three One Percent Balloon Due June Twenty Four Two Thousand Twenty Five [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_FixedRateOfFourPointThreeOnePercentBalloonDueJuneTwentyFourTwoThousandTwentyFiveMember_lbl" xml:lang="en-US" id="id_10729326_2429287_2_1">Fixed Rate of 4.31%, Balloon Due June 24, 2025 [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_FixedRateOfFourPointThreeOnePercentBalloonDueJuneTwentyFourTwoThousandTwentyFiveMember" xlink:to="ajg_FixedRateOfFourPointThreeOnePercentBalloonDueJuneTwentyFourTwoThousandTwentyFiveMember_lbl"/>
    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_FixedRateOfFourPointThreeSixPercentBalloonDueJuneTwentyFourTwoThousandTwentySixMember" xlink:label="ajg_FixedRateOfFourPointThreeSixPercentBalloonDueJuneTwentyFourTwoThousandTwentySixMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_FixedRateOfFourPointThreeSixPercentBalloonDueJuneTwentyFourTwoThousandTwentySixMember_lbl" xml:lang="en-US" id="id_10729326_2429293_3_1">Fixed Rate Of Four Point Three Six Percent Balloon Due June Twenty Four Two Thousand Twenty Six [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_FixedRateOfFourPointThreeSixPercentBalloonDueJuneTwentyFourTwoThousandTwentySixMember_lbl" xml:lang="en-US" id="id_10729326_2429293_1_1">Fixed Rate Of Four Point Three Six Percent Balloon Due June Twenty Four Two Thousand Twenty Six [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_FixedRateOfFourPointThreeSixPercentBalloonDueJuneTwentyFourTwoThousandTwentySixMember_lbl" xml:lang="en-US" id="id_10729326_2429293_2_1">Fixed Rate of 4.36%, Balloon Due June 24, 2026 [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_FixedRateOfFourPointThreeSixPercentBalloonDueJuneTwentyFourTwoThousandTwentySixMember" xlink:to="ajg_FixedRateOfFourPointThreeSixPercentBalloonDueJuneTwentyFourTwoThousandTwentySixMember_lbl"/>
    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_FixedRateOfSixPointFourFourPercentBalloonDueAugustThreeTwoThousandSeventeenMember" xlink:label="ajg_FixedRateOfSixPointFourFourPercentBalloonDueAugustThreeTwoThousandSeventeenMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_FixedRateOfSixPointFourFourPercentBalloonDueAugustThreeTwoThousandSeventeenMember_lbl" xml:lang="en-US" id="id_10729326_2429273_3_1">Fixed rate of six point four four percent, balloon due August three two thousand seventeen.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_FixedRateOfSixPointFourFourPercentBalloonDueAugustThreeTwoThousandSeventeenMember_lbl" xml:lang="en-US" id="id_10729326_2429273_1_1">Fixed Rate Of Six Point Four Four Percent Balloon Due August Three Two Thousand Seventeen [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_FixedRateOfSixPointFourFourPercentBalloonDueAugustThreeTwoThousandSeventeenMember_lbl" xml:lang="en-US" id="id_10729326_2429273_2_1">Fixed Rate of 6.44%, Balloon Due August 3, 2017 [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_FixedRateOfSixPointFourFourPercentBalloonDueAugustThreeTwoThousandSeventeenMember" xlink:to="ajg_FixedRateOfSixPointFourFourPercentBalloonDueAugustThreeTwoThousandSeventeenMember_lbl"/>
    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_FixedRateOfThreePointFourEightPercentBalloonDueJuneTwentyFourTwoThousandTwentyMember" xlink:label="ajg_FixedRateOfThreePointFourEightPercentBalloonDueJuneTwentyFourTwoThousandTwentyMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_FixedRateOfThreePointFourEightPercentBalloonDueJuneTwentyFourTwoThousandTwentyMember_lbl" xml:lang="en-US" id="id_10729326_2429281_3_1">Fixed rate of three point four eight percent balloon due June twenty four, two thousand twenty.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_FixedRateOfThreePointFourEightPercentBalloonDueJuneTwentyFourTwoThousandTwentyMember_lbl" xml:lang="en-US" id="id_10729326_2429281_1_1">Fixed Rate Of Three Point Four Eight Percent Balloon Due June Twenty Four Two Thousand Twenty [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_FixedRateOfThreePointFourEightPercentBalloonDueJuneTwentyFourTwoThousandTwentyMember_lbl" xml:lang="en-US" id="id_10729326_2429281_2_1">Fixed Rate of 3.48%, Balloon Due June 24, 2020 [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_FixedRateOfThreePointFourEightPercentBalloonDueJuneTwentyFourTwoThousandTwentyMember" xlink:to="ajg_FixedRateOfThreePointFourEightPercentBalloonDueJuneTwentyFourTwoThousandTwentyMember_lbl"/>
    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_FixedRateOfThreePointFourSixPercentageBalloonDueDecemberOneTwoThousandTwentySevenMember" xlink:label="ajg_FixedRateOfThreePointFourSixPercentageBalloonDueDecemberOneTwoThousandTwentySevenMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_FixedRateOfThreePointFourSixPercentageBalloonDueDecemberOneTwoThousandTwentySevenMember_lbl" xml:lang="en-US" id="id_10729326_2429291_3_1">Fixed rate of three point four six percentage, balloon due December one, two thousand twenty seven.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_FixedRateOfThreePointFourSixPercentageBalloonDueDecemberOneTwoThousandTwentySevenMember_lbl" xml:lang="en-US" id="id_10729326_2429291_1_1">Fixed Rate Of Three Point Four Six Percentage Balloon Due December One Two Thousand Twenty Seven [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_FixedRateOfThreePointFourSixPercentageBalloonDueDecemberOneTwoThousandTwentySevenMember_lbl" xml:lang="en-US" id="id_10729326_2429291_2_1">Fixed Rate of 3.46%, Balloon Due December 1, 2027 [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_FixedRateOfThreePointFourSixPercentageBalloonDueDecemberOneTwoThousandTwentySevenMember" xlink:to="ajg_FixedRateOfThreePointFourSixPercentageBalloonDueDecemberOneTwoThousandTwentySevenMember_lbl"/>
    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_FixedRateOfThreePointNineNinePercentBalloonDueJulyTenTwoThousandTwentyMember" xlink:label="ajg_FixedRateOfThreePointNineNinePercentBalloonDueJulyTenTwoThousandTwentyMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_FixedRateOfThreePointNineNinePercentBalloonDueJulyTenTwoThousandTwentyMember_lbl" xml:lang="en-US" id="id_10729326_2429280_3_1">Fixed rate of three point nine nine percent, balloon due July ten, two thousand twenty.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_FixedRateOfThreePointNineNinePercentBalloonDueJulyTenTwoThousandTwentyMember_lbl" xml:lang="en-US" id="id_10729326_2429280_1_1">Fixed Rate Of Three Point Nine Nine Percent Balloon Due July Ten Two Thousand Twenty [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_FixedRateOfThreePointNineNinePercentBalloonDueJulyTenTwoThousandTwentyMember_lbl" xml:lang="en-US" id="id_10729326_2429280_2_1">Fixed Rate of 3.99%, Balloon Due July 10, 2020 [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_FixedRateOfThreePointNineNinePercentBalloonDueJulyTenTwoThousandTwentyMember" xlink:to="ajg_FixedRateOfThreePointNineNinePercentBalloonDueJulyTenTwoThousandTwentyMember_lbl"/>
    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_FixedRateOfThreePointSixNinePercentBalloonDueJuneFourteenTwoThousandTwentyTwoMember" xlink:label="ajg_FixedRateOfThreePointSixNinePercentBalloonDueJuneFourteenTwoThousandTwentyTwoMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_FixedRateOfThreePointSixNinePercentBalloonDueJuneFourteenTwoThousandTwentyTwoMember_lbl" xml:lang="en-US" id="id_10729326_2429283_3_1">Fixed rate of three point six nine percent, balloon due June fourteen, two thousand twenty two.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_FixedRateOfThreePointSixNinePercentBalloonDueJuneFourteenTwoThousandTwentyTwoMember_lbl" xml:lang="en-US" id="id_10729326_2429283_1_1">Fixed Rate Of Three Point Six Nine Percent Balloon Due June Fourteen Two Thousand Twenty Two [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_FixedRateOfThreePointSixNinePercentBalloonDueJuneFourteenTwoThousandTwentyTwoMember_lbl" xml:lang="en-US" id="id_10729326_2429283_2_1">Fixed Rate of 3.69%, Balloon Due June 14, 2022 [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_FixedRateOfThreePointSixNinePercentBalloonDueJuneFourteenTwoThousandTwentyTwoMember" xlink:to="ajg_FixedRateOfThreePointSixNinePercentBalloonDueJuneFourteenTwoThousandTwentyTwoMember_lbl"/>
    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_FixedRateOfThreePointTwoZeroPercentBalloonDueJuneTwentyFourTwoThousandNineteenMember" xlink:label="ajg_FixedRateOfThreePointTwoZeroPercentBalloonDueJuneTwentyFourTwoThousandNineteenMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_FixedRateOfThreePointTwoZeroPercentBalloonDueJuneTwentyFourTwoThousandNineteenMember_lbl" xml:lang="en-US" id="id_10729326_2429279_3_1">Fixed rate of three point two zero percent, balloon due June twenty four, two thousand nineteen.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_FixedRateOfThreePointTwoZeroPercentBalloonDueJuneTwentyFourTwoThousandNineteenMember_lbl" xml:lang="en-US" id="id_10729326_2429279_1_1">Fixed Rate Of Three Point Two Zero Percent Balloon Due June Twenty Four Two Thousand Nineteen [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_FixedRateOfThreePointTwoZeroPercentBalloonDueJuneTwentyFourTwoThousandNineteenMember_lbl" xml:lang="en-US" id="id_10729326_2429279_2_1">Fixed Rate of 3.20%, Balloon Due June 24, 2019 [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_FixedRateOfThreePointTwoZeroPercentBalloonDueJuneTwentyFourTwoThousandNineteenMember" xlink:to="ajg_FixedRateOfThreePointTwoZeroPercentBalloonDueJuneTwentyFourTwoThousandNineteenMember_lbl"/>
    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_FixedRateOfTwoPointEightZeroPercentBalloonDueJuneTwentyFourTwoThousandEighteenMember" xlink:label="ajg_FixedRateOfTwoPointEightZeroPercentBalloonDueJuneTwentyFourTwoThousandEighteenMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_FixedRateOfTwoPointEightZeroPercentBalloonDueJuneTwentyFourTwoThousandEighteenMember_lbl" xml:lang="en-US" id="id_10729326_2429278_3_1">Fixed rate of two point eight zero percent balloon due June twenty four two thousand eighteen.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_FixedRateOfTwoPointEightZeroPercentBalloonDueJuneTwentyFourTwoThousandEighteenMember_lbl" xml:lang="en-US" id="id_10729326_2429278_1_1">Fixed Rate Of Two Point Eight Zero Percent Balloon Due June Twenty Four Two Thousand Eighteen [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_FixedRateOfTwoPointEightZeroPercentBalloonDueJuneTwentyFourTwoThousandEighteenMember_lbl" xml:lang="en-US" id="id_10729326_2429278_2_1">Fixed Rate of 2.80%, Balloon Due June 24, 2018 [Member]</label>
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    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ForeignCurrencyTransactionGainLossBeforeTax_lbl" xml:lang="en-US" id="id_10729326_2026358_1_1">Foreign Currency Transaction Gain (Loss), before Tax</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="us-gaap_ForeignCurrencyTransactionGainLossBeforeTax_lbl" xml:lang="en-US" id="id_10729326_2026358_14_1">Unrealized foreign currency remeasurement gain (loss)</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ForeignCurrencyTransactionGainLossBeforeTax" xlink:to="us-gaap_ForeignCurrencyTransactionGainLossBeforeTax_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ForeignCurrencyTransactionGainLossUnrealized" xlink:label="us-gaap_ForeignCurrencyTransactionGainLossUnrealized"/>
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    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ForeignCurrencyTransactionGainLossUnrealized" xlink:to="us-gaap_ForeignCurrencyTransactionGainLossUnrealized_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ForeignExchangeContractMember" xlink:label="us-gaap_ForeignExchangeContractMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ForeignExchangeContractMember_lbl" xml:lang="en-US" id="id_10729326_2021560_1_1">Foreign Exchange Contract [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_ForeignExchangeContractMember_lbl" xml:lang="en-US" id="id_10729326_2021560_2_1">Foreign Exchange Contracts [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ForeignExchangeContractMember" xlink:to="us-gaap_ForeignExchangeContractMember_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ForwardContractsMember" xlink:label="us-gaap_ForwardContractsMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ForwardContractsMember_lbl" xml:lang="en-US" id="id_10729326_2024615_1_1">Forward Contracts [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_ForwardContractsMember_lbl" xml:lang="en-US" id="id_10729326_2024615_2_1">Forward Contracts [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ForwardContractsMember" xlink:to="us-gaap_ForwardContractsMember_lbl"/>
    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_FourteenTwoThousandNineEraCleanCoalProductionPlantsMember" xlink:label="ajg_FourteenTwoThousandNineEraCleanCoalProductionPlantsMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_FourteenTwoThousandNineEraCleanCoalProductionPlantsMember_lbl" xml:lang="en-US" id="id_10729326_2209271_3_1">Fourteen Two Thousand Nine Era Clean Coal Production Plants [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_FourteenTwoThousandNineEraCleanCoalProductionPlantsMember_lbl" xml:lang="en-US" id="id_10729326_2209271_1_1">Fourteen Two Thousand Nine Era Clean Coal Production Plants [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_FourteenTwoThousandNineEraCleanCoalProductionPlantsMember_lbl" xml:lang="en-US" id="id_10729326_2209271_2_1">Fourteen 2009 Era Clean Coal Plants [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_FourteenTwoThousandNineEraCleanCoalProductionPlantsMember" xlink:to="ajg_FourteenTwoThousandNineEraCleanCoalProductionPlantsMember_lbl"/>
    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_FundingCommitmentsMember" xlink:label="ajg_FundingCommitmentsMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_FundingCommitmentsMember_lbl" xml:lang="en-US" id="id_10729326_2060990_3_1">Funding Commitments [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_FundingCommitmentsMember_lbl" xml:lang="en-US" id="id_10729326_2060990_1_1">Funding Commitments [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_FundingCommitmentsMember_lbl" xml:lang="en-US" id="id_10729326_2060990_2_1">Funding Commitments [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_FundingCommitmentsMember" xlink:to="ajg_FundingCommitmentsMember_lbl"/>
    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_FutureAmortizationExpenseOfFiscalYear" xlink:label="ajg_FutureAmortizationExpenseOfFiscalYear"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_FutureAmortizationExpenseOfFiscalYear_lbl" xml:lang="en-US" id="id_10729326_2125826_3_1">Future Amortization Expense Of Fiscal Year</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_FutureAmortizationExpenseOfFiscalYear_lbl" xml:lang="en-US" id="id_10729326_2125826_1_1">Future Amortization Expense Of Fiscal Year</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="ajg_FutureAmortizationExpenseOfFiscalYear_lbl" xml:lang="en-US" id="id_10729326_2125826_6_1">Total</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_FutureAmortizationExpenseOfFiscalYear" xlink:to="ajg_FutureAmortizationExpenseOfFiscalYear_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_GainLossOnInvestments" xlink:label="us-gaap_GainLossOnInvestments"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_GainLossOnInvestments_lbl" xml:lang="en-US" id="id_10729326_2028566_1_1">Gain (Loss) on Investments</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="us-gaap_GainLossOnInvestments_lbl" xml:lang="en-US" id="id_10729326_2028566_14_1">Net gain on investments and other</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_GainLossOnInvestments" xlink:to="us-gaap_GainLossOnInvestments_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_GainLossOnSaleOfEquityInvestments" xlink:label="us-gaap_GainLossOnSaleOfEquityInvestments"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_GainLossOnSaleOfEquityInvestments_lbl" xml:lang="en-US" id="id_10729326_2031359_1_1">Gain (Loss) on Sale of Equity Investments</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_GainLossOnSaleOfEquityInvestments_lbl" xml:lang="en-US" id="id_10729326_2031359_2_1">Gains on books of business sales</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_GainLossOnSaleOfEquityInvestments" xlink:to="us-gaap_GainLossOnSaleOfEquityInvestments_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/country/2016/country-2016-01-31.xsd#country_GB" xlink:label="country_GB"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="country_GB_lbl" xml:lang="en-US" id="id_10729326_2024405_1_1">UNITED KINGDOM</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="country_GB_lbl" xml:lang="en-US" id="id_10729326_2024405_2_1">United Kingdom [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="country_GB" xlink:to="country_GB_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_Goodwill" xlink:label="us-gaap_Goodwill"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_Goodwill_lbl" xml:lang="en-US" id="id_10729326_2031370_1_1">Goodwill</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:label="us-gaap_Goodwill_lbl" xml:lang="en-US" id="id_10729326_2031370_4_1">Balance as of March 31, 2017</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:label="us-gaap_Goodwill_lbl" xml:lang="en-US" id="id_10729326_2031370_5_1">Beginning Balance</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_Goodwill_lbl" xml:lang="en-US" id="id_10729326_2031370_2_1">Goodwill - net</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_Goodwill_lbl" xml:lang="en-US" id="id_10729326_2031370_12_1">Total goodwill - net</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_Goodwill" xlink:to="us-gaap_Goodwill_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_GoodwillAcquiredDuringPeriod" xlink:label="us-gaap_GoodwillAcquiredDuringPeriod"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_GoodwillAcquiredDuringPeriod_lbl" xml:lang="en-US" id="id_10729326_2034625_1_1">Goodwill, Acquired During Period</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_GoodwillAcquiredDuringPeriod_lbl" xml:lang="en-US" id="id_10729326_2034625_2_1">Goodwill acquired during the period</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_GoodwillAcquiredDuringPeriod" xlink:to="us-gaap_GoodwillAcquiredDuringPeriod_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_GoodwillAndIntangibleAssetsDisclosureAbstract" xlink:label="us-gaap_GoodwillAndIntangibleAssetsDisclosureAbstract"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_GoodwillAndIntangibleAssetsDisclosureAbstract_lbl" xml:lang="en-US" id="id_10729326_2024406_1_1">Goodwill and Intangible Assets Disclosure [Abstract]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_GoodwillAndIntangibleAssetsDisclosureAbstract_lbl" xml:lang="en-US" id="id_10729326_2024406_2_1">Goodwill and Intangible Assets Disclosure [Abstract]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_GoodwillAndIntangibleAssetsDisclosureAbstract" xlink:to="us-gaap_GoodwillAndIntangibleAssetsDisclosureAbstract_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_GoodwillAndIntangibleAssetsDisclosureTextBlock" xlink:label="us-gaap_GoodwillAndIntangibleAssetsDisclosureTextBlock"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_GoodwillAndIntangibleAssetsDisclosureTextBlock_lbl" xml:lang="en-US" id="id_10729326_2022883_1_1">Goodwill and Intangible Assets Disclosure [Text Block]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_GoodwillAndIntangibleAssetsDisclosureTextBlock_lbl" xml:lang="en-US" id="id_10729326_2022883_2_1">Intangible Assets</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_GoodwillAndIntangibleAssetsDisclosureTextBlock" xlink:to="us-gaap_GoodwillAndIntangibleAssetsDisclosureTextBlock_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_GoodwillAndIntangibleAssetsPolicyTextBlock" xlink:label="us-gaap_GoodwillAndIntangibleAssetsPolicyTextBlock"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_GoodwillAndIntangibleAssetsPolicyTextBlock_lbl" xml:lang="en-US" id="id_10729326_2021808_1_1">Goodwill and Intangible Assets, Policy [Policy Text Block]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_GoodwillAndIntangibleAssetsPolicyTextBlock_lbl" xml:lang="en-US" id="id_10729326_2021808_2_1">Intangibles - Goodwill and Other</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_GoodwillAndIntangibleAssetsPolicyTextBlock" xlink:to="us-gaap_GoodwillAndIntangibleAssetsPolicyTextBlock_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_GoodwillLineItems" xlink:label="us-gaap_GoodwillLineItems"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_GoodwillLineItems_lbl" xml:lang="en-US" id="id_10729326_2022884_1_1">Goodwill [Line Items]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_GoodwillLineItems_lbl" xml:lang="en-US" id="id_10729326_2022884_2_1">Goodwill [Line Items]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_GoodwillLineItems" xlink:to="us-gaap_GoodwillLineItems_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_GoodwillPurchaseAccountingAdjustments" xlink:label="us-gaap_GoodwillPurchaseAccountingAdjustments"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_GoodwillPurchaseAccountingAdjustments_lbl" xml:lang="en-US" id="id_10729326_2035461_1_1">Goodwill, Purchase Accounting Adjustments</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_GoodwillPurchaseAccountingAdjustments_lbl" xml:lang="en-US" id="id_10729326_2035461_2_1">Goodwill adjustments due to appraisals and other acquisition adjustments</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_GoodwillPurchaseAccountingAdjustments" xlink:to="us-gaap_GoodwillPurchaseAccountingAdjustments_lbl"/>
    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_GoodwillRelatedToNondeductibleAmortizableIntangibleAssets" xlink:label="ajg_GoodwillRelatedToNondeductibleAmortizableIntangibleAssets"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_GoodwillRelatedToNondeductibleAmortizableIntangibleAssets_lbl" xml:lang="en-US" id="id_10729326_2290485_3_1">Goodwill Related to Nondeductible Amortizable Intangible Assets</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_GoodwillRelatedToNondeductibleAmortizableIntangibleAssets_lbl" xml:lang="en-US" id="id_10729326_2290485_1_1">Goodwill Related To Nondeductible Amortizable Intangible Assets</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_GoodwillRelatedToNondeductibleAmortizableIntangibleAssets_lbl" xml:lang="en-US" id="id_10729326_2290485_2_1">Goodwill related to nondeductible amortizable intangible assets</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_GoodwillRelatedToNondeductibleAmortizableIntangibleAssets" xlink:to="ajg_GoodwillRelatedToNondeductibleAmortizableIntangibleAssets_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_GoodwillTranslationAndPurchaseAccountingAdjustments" xlink:label="us-gaap_GoodwillTranslationAndPurchaseAccountingAdjustments"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_GoodwillTranslationAndPurchaseAccountingAdjustments_lbl" xml:lang="en-US" id="id_10729326_2029623_1_1">Goodwill, Translation and Purchase Accounting Adjustments</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_GoodwillTranslationAndPurchaseAccountingAdjustments_lbl" xml:lang="en-US" id="id_10729326_2029623_2_1">Foreign currency translation adjustments during the period</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_GoodwillTranslationAndPurchaseAccountingAdjustments" xlink:to="us-gaap_GoodwillTranslationAndPurchaseAccountingAdjustments_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_GuaranteeObligationsByNatureAxis" xlink:label="us-gaap_GuaranteeObligationsByNatureAxis"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_GuaranteeObligationsByNatureAxis_lbl" xml:lang="en-US" id="id_10729326_2025713_1_1">Guarantor Obligations, Nature [Axis]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_GuaranteeObligationsByNatureAxis_lbl" xml:lang="en-US" id="id_10729326_2025713_2_1">Guarantor Obligations, Nature [Axis]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_GuaranteeObligationsByNatureAxis" xlink:to="us-gaap_GuaranteeObligationsByNatureAxis_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_GuaranteeObligationsNatureDomain" xlink:label="us-gaap_GuaranteeObligationsNatureDomain"/>
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    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_GuaranteeObligationsNatureDomain_lbl" xml:lang="en-US" id="id_10729326_2033865_2_1">Guarantor Obligations, Nature [Domain]</label>
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    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_InsuranceBrokerageAndRiskManagementServicesMember_lbl" xml:lang="en-US" id="id_10729326_2288961_3_1">Insurance Brokerage And Risk Management Services [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_InsuranceBrokerageAndRiskManagementServicesMember_lbl" xml:lang="en-US" id="id_10729326_2288961_1_1">Insurance Brokerage And Risk Management Services [Member]</label>
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    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_InterbankRatesPlusOnePointZeroFivePercentExpiresMayEighteenTwoThousandSeventeenMember_lbl" xml:lang="en-US" id="id_10729326_2341316_1_1">Interbank Rates Plus One Point Zero Five Percent Expires May Eighteen Two Thousand Seventeen [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_InterbankRatesPlusOnePointZeroFivePercentExpiresMayEighteenTwoThousandSeventeenMember_lbl" xml:lang="en-US" id="id_10729326_2341316_2_1">Interbank rates plus 1.05%, Expires May 18, 2017 [Member]</label>
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    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_InterbankRatesPlusZeroPointFiveFivePercentExpiresMayEighteenTwoThousandSeventeenMember_lbl" xml:lang="en-US" id="id_10729326_2214932_3_1">Interbank Rates Plus Zero Point Five Five Percent Expires May Eighteen Two Thousand Seventeen [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_InterbankRatesPlusZeroPointFiveFivePercentExpiresMayEighteenTwoThousandSeventeenMember_lbl" xml:lang="en-US" id="id_10729326_2214932_1_1">Interbank Rates Plus Zero Point Five Five Percent Expires May Eighteen Two Thousand Seventeen [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_InterbankRatesPlusZeroPointFiveFivePercentExpiresMayEighteenTwoThousandSeventeenMember_lbl" xml:lang="en-US" id="id_10729326_2214932_2_1">Interbank rates plus 0.55%, Expires May 18, 2017 [Member]</label>
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    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_InterestExpense_lbl" xml:lang="en-US" id="id_10729326_2030293_1_1">Interest Expense</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_InterestExpense_lbl" xml:lang="en-US" id="id_10729326_2030293_2_1">Interest</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InterestExpense" xlink:to="us-gaap_InterestExpense_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_InterestExpenseMember" xlink:label="us-gaap_InterestExpenseMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_InterestExpenseMember_lbl" xml:lang="en-US" id="id_10729326_2034667_1_1">Interest Expense [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_InterestExpenseMember_lbl" xml:lang="en-US" id="id_10729326_2034667_2_1">Interest Expense [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InterestExpenseMember" xlink:to="us-gaap_InterestExpenseMember_lbl"/>
    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_InterestOnDebtMember" xlink:label="ajg_InterestOnDebtMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_InterestOnDebtMember_lbl" xml:lang="en-US" id="id_10729326_2371624_3_1">Interest On Debt [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_InterestOnDebtMember_lbl" xml:lang="en-US" id="id_10729326_2371624_1_1">Interest On Debt [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_InterestOnDebtMember_lbl" xml:lang="en-US" id="id_10729326_2371624_2_1">Interest On Debt [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_InterestOnDebtMember" xlink:to="ajg_InterestOnDebtMember_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_InterestPaid" xlink:label="us-gaap_InterestPaid"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_InterestPaid_lbl" xml:lang="en-US" id="id_10729326_2028616_1_1">Interest Paid</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_InterestPaid_lbl" xml:lang="en-US" id="id_10729326_2028616_2_1">Interest paid</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InterestPaid" xlink:to="us-gaap_InterestPaid_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_InterestRateContractMember" xlink:label="us-gaap_InterestRateContractMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_InterestRateContractMember_lbl" xml:lang="en-US" id="id_10729326_2030944_1_1">Interest Rate Contract [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_InterestRateContractMember_lbl" xml:lang="en-US" id="id_10729326_2030944_2_1">Interest Rate Contracts [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InterestRateContractMember" xlink:to="us-gaap_InterestRateContractMember_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/invest/2013/invest-2013-01-31.xsd#invest_InvestmentAxis" xlink:label="invest_InvestmentAxis"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="invest_InvestmentAxis_lbl" xml:lang="en-US" id="id_10729326_2030755_1_1">Investment [Axis]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="invest_InvestmentAxis_lbl" xml:lang="en-US" id="id_10729326_2030755_2_1">Investment [Axis]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="invest_InvestmentAxis" xlink:to="invest_InvestmentAxis_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/invest/2013/invest-2013-01-31.xsd#invest_InvestmentDomain" xlink:label="invest_InvestmentDomain"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="invest_InvestmentDomain_lbl" xml:lang="en-US" id="id_10729326_2028983_1_1">Investment [Domain]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="invest_InvestmentDomain_lbl" xml:lang="en-US" id="id_10729326_2028983_2_1">Investment [Domain]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="invest_InvestmentDomain" xlink:to="invest_InvestmentDomain_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_InvestmentIncomeNet" xlink:label="us-gaap_InvestmentIncomeNet"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_InvestmentIncomeNet_lbl" xml:lang="en-US" id="id_10729326_2033128_1_1">Investment Income, Net</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_InvestmentIncomeNet_lbl" xml:lang="en-US" id="id_10729326_2033128_2_1">Investment income</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InvestmentIncomeNet" xlink:to="us-gaap_InvestmentIncomeNet_lbl"/>
    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_InvestmentsAndEmployeeDeferredCompensationPlanLineItems" xlink:label="ajg_InvestmentsAndEmployeeDeferredCompensationPlanLineItems"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_InvestmentsAndEmployeeDeferredCompensationPlanLineItems_lbl" xml:lang="en-US" id="id_10729326_2377973_3_1">Investments And Employee Deferred Compensation Plan [Line Items]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_InvestmentsAndEmployeeDeferredCompensationPlanLineItems_lbl" xml:lang="en-US" id="id_10729326_2377973_1_1">Investments And Employee Deferred Compensation Plan [Line Items]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_InvestmentsAndEmployeeDeferredCompensationPlanLineItems_lbl" xml:lang="en-US" id="id_10729326_2377973_2_1">Investments And Employee Deferred Compensation Plan [Line Items]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_InvestmentsAndEmployeeDeferredCompensationPlanLineItems" xlink:to="ajg_InvestmentsAndEmployeeDeferredCompensationPlanLineItems_lbl"/>
    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_InvestmentsAndEmployeeDeferredCompensationPlanTable" xlink:label="ajg_InvestmentsAndEmployeeDeferredCompensationPlanTable"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_InvestmentsAndEmployeeDeferredCompensationPlanTable_lbl" xml:lang="en-US" id="id_10729326_2102520_3_1">Investments And Employee Deferred Compensation Plan [Table]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_InvestmentsAndEmployeeDeferredCompensationPlanTable_lbl" xml:lang="en-US" id="id_10729326_2102520_1_1">Investments And Employee Deferred Compensation Plan [Table]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_InvestmentsAndEmployeeDeferredCompensationPlanTable_lbl" xml:lang="en-US" id="id_10729326_2102520_2_1">Investments And Employee Deferred Compensation Plan [Table]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_InvestmentsAndEmployeeDeferredCompensationPlanTable" xlink:to="ajg_InvestmentsAndEmployeeDeferredCompensationPlanTable_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_LaborAndRelatedExpense" xlink:label="us-gaap_LaborAndRelatedExpense"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_LaborAndRelatedExpense_lbl" xml:lang="en-US" id="id_10729326_2029478_1_1">Labor and Related Expense</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_LaborAndRelatedExpense_lbl" xml:lang="en-US" id="id_10729326_2029478_2_1">Compensation</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_LaborAndRelatedExpense" xlink:to="us-gaap_LaborAndRelatedExpense_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_LeasePolicyTextBlock" xlink:label="us-gaap_LeasePolicyTextBlock"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_LeasePolicyTextBlock_lbl" xml:lang="en-US" id="id_10729326_2028360_1_1">Lease, Policy [Policy Text Block]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_LeasePolicyTextBlock_lbl" xml:lang="en-US" id="id_10729326_2028360_2_1">Leases</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_LeasePolicyTextBlock" xlink:to="us-gaap_LeasePolicyTextBlock_lbl"/>
    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_LessSubleaseArrangementsMember" xlink:label="ajg_LessSubleaseArrangementsMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_LessSubleaseArrangementsMember_lbl" xml:lang="en-US" id="id_10729326_2194282_3_1">Less Sublease Arrangements [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_LessSubleaseArrangementsMember_lbl" xml:lang="en-US" id="id_10729326_2194282_1_1">Less Sublease Arrangements [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_LessSubleaseArrangementsMember_lbl" xml:lang="en-US" id="id_10729326_2194282_2_1">Less Sublease Arrangements [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_LessSubleaseArrangementsMember" xlink:to="ajg_LessSubleaseArrangementsMember_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_LetterOfCreditMember" xlink:label="us-gaap_LetterOfCreditMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_LetterOfCreditMember_lbl" xml:lang="en-US" id="id_10729326_2030533_1_1">Letter of Credit [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_LetterOfCreditMember_lbl" xml:lang="en-US" id="id_10729326_2030533_2_1">Letter of Credit [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_LetterOfCreditMember" xlink:to="us-gaap_LetterOfCreditMember_lbl"/>
    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_LettersOfCreditMember" xlink:label="ajg_LettersOfCreditMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_LettersOfCreditMember_lbl" xml:lang="en-US" id="id_10729326_2280181_3_1">Letters Of Credit [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_LettersOfCreditMember_lbl" xml:lang="en-US" id="id_10729326_2280181_1_1">Letters Of Credit [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_LettersOfCreditMember_lbl" xml:lang="en-US" id="id_10729326_2280181_2_1">Letters of Credit [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_LettersOfCreditMember" xlink:to="ajg_LettersOfCreditMember_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_Liabilities" xlink:label="us-gaap_Liabilities"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_Liabilities_lbl" xml:lang="en-US" id="id_10729326_2031177_1_1">Liabilities</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_Liabilities_lbl" xml:lang="en-US" id="id_10729326_2031177_6_1">Total liabilities</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_Liabilities" xlink:to="us-gaap_Liabilities_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_LiabilitiesAndStockholdersEquity" xlink:label="us-gaap_LiabilitiesAndStockholdersEquity"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_LiabilitiesAndStockholdersEquity_lbl" xml:lang="en-US" id="id_10729326_2031178_1_1">Liabilities and Equity</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_LiabilitiesAndStockholdersEquity_lbl" xml:lang="en-US" id="id_10729326_2031178_6_1">Total liabilities and stockholders' equity</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_LiabilitiesAndStockholdersEquity" xlink:to="us-gaap_LiabilitiesAndStockholdersEquity_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_LiabilitiesCurrent" xlink:label="us-gaap_LiabilitiesCurrent"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_LiabilitiesCurrent_lbl" xml:lang="en-US" id="id_10729326_2031608_1_1">Liabilities, Current</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_LiabilitiesCurrent_lbl" xml:lang="en-US" id="id_10729326_2031608_6_1">Total current liabilities</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_LiabilitiesCurrent" xlink:to="us-gaap_LiabilitiesCurrent_lbl"/>
    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_LiabilitiesRecordedOnSelfInsurance" xlink:label="ajg_LiabilitiesRecordedOnSelfInsurance"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_LiabilitiesRecordedOnSelfInsurance_lbl" xml:lang="en-US" id="id_10729326_2267795_3_1">Liabilities Recorded on Self-Insurance</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_LiabilitiesRecordedOnSelfInsurance_lbl" xml:lang="en-US" id="id_10729326_2267795_1_1">Liabilities Recorded On Self Insurance</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_LiabilitiesRecordedOnSelfInsurance_lbl" xml:lang="en-US" id="id_10729326_2267795_2_1">Liabilities recorded on self-insurance</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_LiabilitiesRecordedOnSelfInsurance" xlink:to="ajg_LiabilitiesRecordedOnSelfInsurance_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_LineOfCreditFacilityAxis" xlink:label="us-gaap_LineOfCreditFacilityAxis"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_LineOfCreditFacilityAxis_lbl" xml:lang="en-US" id="id_10729326_2033936_1_1">Lender Name [Axis]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_LineOfCreditFacilityAxis_lbl" xml:lang="en-US" id="id_10729326_2033936_2_1">Lender Name [Axis]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_LineOfCreditFacilityAxis" xlink:to="us-gaap_LineOfCreditFacilityAxis_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_LineOfCreditFacilityLenderDomain" xlink:label="us-gaap_LineOfCreditFacilityLenderDomain"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_LineOfCreditFacilityLenderDomain_lbl" xml:lang="en-US" id="id_10729326_2029012_1_1">Line of Credit Facility, Lender [Domain]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_LineOfCreditFacilityLenderDomain_lbl" xml:lang="en-US" id="id_10729326_2029012_2_1">Line of Credit Facility, Lender [Domain]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_LineOfCreditFacilityLenderDomain" xlink:to="us-gaap_LineOfCreditFacilityLenderDomain_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_LongTermDebt" xlink:label="us-gaap_LongTermDebt"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_LongTermDebt_lbl" xml:lang="en-US" id="id_10729326_2029027_1_1">Long-term Debt</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_LongTermDebt_lbl" xml:lang="en-US" id="id_10729326_2029027_2_1">Debt</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_LongTermDebt" xlink:to="us-gaap_LongTermDebt_lbl"/>
    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearSeven" xlink:label="ajg_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearSeven"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearSeven_lbl" xml:lang="en-US" id="id_10729326_2091330_3_1">Long Term Debt Maturities Repayments Of Principal In Year Seven</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearSeven_lbl" xml:lang="en-US" id="id_10729326_2091330_1_1">Long Term Debt Maturities Repayments Of Principal In Year Seven</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearSeven_lbl" xml:lang="en-US" id="id_10729326_2091330_2_1">Long-Term debt maturities repayments in 2019</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearSeven" xlink:to="ajg_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearSeven_lbl"/>
    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearSix" xlink:label="ajg_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearSix"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearSix_lbl" xml:lang="en-US" id="id_10729326_2273781_3_1">Long Term Debt Maturities Repayments Of Principal In Year Six</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearSix_lbl" xml:lang="en-US" id="id_10729326_2273781_1_1">Long Term Debt Maturities Repayments Of Principal In Year Six</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearSix_lbl" xml:lang="en-US" id="id_10729326_2273781_2_1">Long-Term debt maturities repayments in 2018</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearSix" xlink:to="ajg_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearSix_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_LongTermDebtNoncurrent" xlink:label="us-gaap_LongTermDebtNoncurrent"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_LongTermDebtNoncurrent_lbl" xml:lang="en-US" id="id_10729326_2028655_1_1">Long-term Debt, Excluding Current Maturities</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_LongTermDebtNoncurrent_lbl" xml:lang="en-US" id="id_10729326_2028655_2_1">Corporate related borrowings - noncurrent</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_LongTermDebtNoncurrent" xlink:to="us-gaap_LongTermDebtNoncurrent_lbl"/>
    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_LongTermIncentivePlanMember" xlink:label="ajg_LongTermIncentivePlanMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_LongTermIncentivePlanMember_lbl" xml:lang="en-US" id="id_10729326_2332662_3_1">Long Term Incentive Plan [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_LongTermIncentivePlanMember_lbl" xml:lang="en-US" id="id_10729326_2332662_1_1">Long Term Incentive Plan [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_LongTermIncentivePlanMember_lbl" xml:lang="en-US" id="id_10729326_2332662_2_1">Long Term Incentive Plan [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_LongTermIncentivePlanMember" xlink:to="ajg_LongTermIncentivePlanMember_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis" xlink:label="us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis_lbl" xml:lang="en-US" id="id_10729326_2040972_1_1">Category of Item Purchased [Axis]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis_lbl" xml:lang="en-US" id="id_10729326_2040972_2_1">Category of Item Purchased [Axis]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis" xlink:to="us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_LongTermPurchaseCommitmentCategoryOfItemPurchasedDomain" xlink:label="us-gaap_LongTermPurchaseCommitmentCategoryOfItemPurchasedDomain"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_LongTermPurchaseCommitmentCategoryOfItemPurchasedDomain_lbl" xml:lang="en-US" id="id_10729326_2034941_1_1">Long-term Purchase Commitment, Category of Item Purchased [Domain]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_LongTermPurchaseCommitmentCategoryOfItemPurchasedDomain_lbl" xml:lang="en-US" id="id_10729326_2034941_2_1">Long-term Purchase Commitment, Category of Item Purchased [Domain]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_LongTermPurchaseCommitmentCategoryOfItemPurchasedDomain" xlink:to="us-gaap_LongTermPurchaseCommitmentCategoryOfItemPurchasedDomain_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_MajorTypesOfDebtSecuritiesDomain" xlink:label="us-gaap_MajorTypesOfDebtSecuritiesDomain"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_MajorTypesOfDebtSecuritiesDomain_lbl" xml:lang="en-US" id="id_10729326_2028397_1_1">Major Types of Debt Securities [Domain]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_MajorTypesOfDebtSecuritiesDomain_lbl" xml:lang="en-US" id="id_10729326_2028397_2_1">Major Types of Debt Securities [Domain]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_MajorTypesOfDebtSecuritiesDomain" xlink:to="us-gaap_MajorTypesOfDebtSecuritiesDomain_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_MarketApproachValuationTechniqueMember" xlink:label="us-gaap_MarketApproachValuationTechniqueMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_MarketApproachValuationTechniqueMember_lbl" xml:lang="en-US" id="id_10729326_2034174_1_1">Market Approach Valuation Technique [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_MarketApproachValuationTechniqueMember_lbl" xml:lang="en-US" id="id_10729326_2034174_2_1">Market Approach Valuation Technique [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_MarketApproachValuationTechniqueMember" xlink:to="us-gaap_MarketApproachValuationTechniqueMember_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_MaximumMember" xlink:label="us-gaap_MaximumMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_MaximumMember_lbl" xml:lang="en-US" id="id_10729326_2033371_1_1">Maximum [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_MaximumMember_lbl" xml:lang="en-US" id="id_10729326_2033371_2_1">Maximum [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_MaximumMember" xlink:to="us-gaap_MaximumMember_lbl"/>
    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_MaximumPotentialEarnoutPayable" xlink:label="ajg_MaximumPotentialEarnoutPayable"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_MaximumPotentialEarnoutPayable_lbl" xml:lang="en-US" id="id_10729326_2166450_3_1">Maximum Potential Earnout Payable</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_MaximumPotentialEarnoutPayable_lbl" xml:lang="en-US" id="id_10729326_2166450_1_1">Maximum Potential Earnout Payable</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_MaximumPotentialEarnoutPayable_lbl" xml:lang="en-US" id="id_10729326_2166450_2_1">Maximum Potential Earnout Payable</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_MaximumPotentialEarnoutPayable" xlink:to="ajg_MaximumPotentialEarnoutPayable_lbl"/>
    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_MicroCaptiveInsuranceCompaniesManaged" xlink:label="ajg_MicroCaptiveInsuranceCompaniesManaged"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_MicroCaptiveInsuranceCompaniesManaged_lbl" xml:lang="en-US" id="id_10729326_2097611_3_1">Micro captive Insurance Companies Managed</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_MicroCaptiveInsuranceCompaniesManaged_lbl" xml:lang="en-US" id="id_10729326_2097611_1_1">Micro captive Insurance Companies Managed</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_MicroCaptiveInsuranceCompaniesManaged_lbl" xml:lang="en-US" id="id_10729326_2097611_2_1">Number of micro-captive insurance companies organized or managed</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_MicroCaptiveInsuranceCompaniesManaged" xlink:to="ajg_MicroCaptiveInsuranceCompaniesManaged_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_MinimumMember" xlink:label="us-gaap_MinimumMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_MinimumMember_lbl" xml:lang="en-US" id="id_10729326_2030148_1_1">Minimum [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_MinimumMember_lbl" xml:lang="en-US" id="id_10729326_2030148_2_1">Minimum [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_MinimumMember" xlink:to="us-gaap_MinimumMember_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_MinorityInterest" xlink:label="us-gaap_MinorityInterest"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_MinorityInterest_lbl" xml:lang="en-US" id="id_10729326_2031641_1_1">Stockholders' Equity Attributable to Noncontrolling Interest</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_MinorityInterest_lbl" xml:lang="en-US" id="id_10729326_2031641_2_1">Stockholders' equity attributable to noncontrolling interests</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_MinorityInterest" xlink:to="us-gaap_MinorityInterest_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders" xlink:label="us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders_lbl" xml:lang="en-US" id="id_10729326_2032344_1_1">Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders_lbl" xml:lang="en-US" id="id_10729326_2032344_14_1">Dividends paid to noncontrolling interests</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders" xlink:to="us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:label="us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_lbl" xml:lang="en-US" id="id_10729326_2031020_1_1">Net Cash Provided by (Used in) Financing Activities [Abstract]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_lbl" xml:lang="en-US" id="id_10729326_2031020_2_1">Cash flows from financing activities:</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:to="us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations" xlink:label="us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations_lbl" xml:lang="en-US" id="id_10729326_2032942_1_1">Net Cash Provided by (Used in) Financing Activities, Continuing Operations</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations_lbl" xml:lang="en-US" id="id_10729326_2032942_2_1">Reclassification of payments from investing activities to financing activities</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations_lbl" xml:lang="en-US" id="id_10729326_2032942_6_1">Net cash provided (used) by financing activities</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations" xlink:to="us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract" xlink:label="us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_lbl" xml:lang="en-US" id="id_10729326_2032943_1_1">Net Cash Provided by (Used in) Investing Activities [Abstract]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_lbl" xml:lang="en-US" id="id_10729326_2032943_2_1">Cash flows from investing activities:</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract" xlink:to="us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations" xlink:label="us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations_lbl" xml:lang="en-US" id="id_10729326_2030371_1_1">Net Cash Provided by (Used in) Investing Activities, Continuing Operations</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations_lbl" xml:lang="en-US" id="id_10729326_2030371_6_1">Net cash used by investing activities</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations" xlink:to="us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract" xlink:label="us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_lbl" xml:lang="en-US" id="id_10729326_2030818_1_1">Net Cash Provided by (Used in) Operating Activities [Abstract]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_lbl" xml:lang="en-US" id="id_10729326_2030818_2_1">Cash flows from operating activities:</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract" xlink:to="us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations" xlink:label="us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_lbl" xml:lang="en-US" id="id_10729326_2034376_1_1">Net Cash Provided by (Used in) Operating Activities, Continuing Operations</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_lbl" xml:lang="en-US" id="id_10729326_2034376_2_1">Reclassification of payments from investing activities to operating activities</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_lbl" xml:lang="en-US" id="id_10729326_2034376_6_1">Net cash provided by operating activities</label>
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    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_NetChangeInFeesReceivableUnearnedFees" xlink:label="ajg_NetChangeInFeesReceivableUnearnedFees"/>
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    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="ajg_NetChangeInFeesReceivableUnearnedFees_lbl" xml:lang="en-US" id="id_10729326_2305218_14_1">Net change in fees receivable/unearned fees</label>
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    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_NetIncomeLoss" xlink:label="us-gaap_NetIncomeLoss"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_NetIncomeLoss_lbl" xml:lang="en-US" id="id_10729326_2030161_1_1">Net Income (Loss) Attributable to Parent</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_NetIncomeLoss_lbl" xml:lang="en-US" id="id_10729326_2030161_2_1">Net earnings attributable to controlling interests</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_NetIncomeLoss_lbl" xml:lang="en-US" id="id_10729326_2030161_6_1">Net earnings attributable to controlling interests</label>
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    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_NetIncomeLossAttributableToNoncontrollingInterest" xlink:label="us-gaap_NetIncomeLossAttributableToNoncontrollingInterest"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_lbl" xml:lang="en-US" id="id_10729326_2030162_1_1">Net Income (Loss) Attributable to Noncontrolling Interest</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_lbl" xml:lang="en-US" id="id_10729326_2030162_2_1">Net earnings attributable to noncontrolling interests</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_NetIncomeLossAttributableToNoncontrollingInterest" xlink:to="us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_lbl"/>
    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_NetProceedsFromSalesOfOperations" xlink:label="ajg_NetProceedsFromSalesOfOperations"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_NetProceedsFromSalesOfOperations_lbl" xml:lang="en-US" id="id_10729326_2150341_3_1">Net Proceeds From Sales Of Operations</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_NetProceedsFromSalesOfOperations_lbl" xml:lang="en-US" id="id_10729326_2150341_1_1">Net Proceeds From Sales Of Operations</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_NetProceedsFromSalesOfOperations_lbl" xml:lang="en-US" id="id_10729326_2150341_2_1">Net proceeds from sales of operations/books of business</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_NetProceedsFromSalesOfOperations" xlink:to="ajg_NetProceedsFromSalesOfOperations_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_NewAccountingPronouncementsAndChangesInAccountingPrinciplesAbstract" xlink:label="us-gaap_NewAccountingPronouncementsAndChangesInAccountingPrinciplesAbstract"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_NewAccountingPronouncementsAndChangesInAccountingPrinciplesAbstract_lbl" xml:lang="en-US" id="id_10729326_2034746_1_1">New Accounting Pronouncements and Changes in Accounting Principles [Abstract]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_NewAccountingPronouncementsAndChangesInAccountingPrinciplesAbstract_lbl" xml:lang="en-US" id="id_10729326_2034746_2_1">New Accounting Pronouncements and Changes in Accounting Principles [Abstract]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_NewAccountingPronouncementsAndChangesInAccountingPrinciplesAbstract" xlink:to="us-gaap_NewAccountingPronouncementsAndChangesInAccountingPrinciplesAbstract_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_NewAccountingPronouncementsAndChangesInAccountingPrinciplesTextBlock" xlink:label="us-gaap_NewAccountingPronouncementsAndChangesInAccountingPrinciplesTextBlock"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_NewAccountingPronouncementsAndChangesInAccountingPrinciplesTextBlock_lbl" xml:lang="en-US" id="id_10729326_2031651_1_1">New Accounting Pronouncements and Changes in Accounting Principles [Text Block]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_NewAccountingPronouncementsAndChangesInAccountingPrinciplesTextBlock_lbl" xml:lang="en-US" id="id_10729326_2031651_2_1">Effect of New Accounting Pronouncements</label>
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    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems" xlink:label="us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems"/>
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    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_lbl" xml:lang="en-US" id="id_10729326_2032112_2_1">New Accounting Pronouncements or Change in Accounting Principle [Line Items]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems" xlink:to="us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable" xlink:label="us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable"/>
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    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable_lbl" xml:lang="en-US" id="id_10729326_2029953_2_1">New Accounting Pronouncements or Change in Accounting Principle [Table]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable" xlink:to="us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable_lbl"/>
    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_NineOtherAcquisitionsMember" xlink:label="ajg_NineOtherAcquisitionsMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_NineOtherAcquisitionsMember_lbl" xml:lang="en-US" id="id_10729326_2240538_3_1">Nine Other Acquisitions [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_NineOtherAcquisitionsMember_lbl" xml:lang="en-US" id="id_10729326_2240538_1_1">Nine other acquisitions [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_NineOtherAcquisitionsMember_lbl" xml:lang="en-US" id="id_10729326_2240538_2_1">Nine Other Acquisitions [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_NineOtherAcquisitionsMember" xlink:to="ajg_NineOtherAcquisitionsMember_lbl"/>
    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_NineteenTwoThousandElevenEraCleanCoalProductionPlantsMember" xlink:label="ajg_NineteenTwoThousandElevenEraCleanCoalProductionPlantsMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_NineteenTwoThousandElevenEraCleanCoalProductionPlantsMember_lbl" xml:lang="en-US" id="id_10729326_2379020_3_1">Nineteen Two Thousand Eleven Era Clean Coal Production Plants [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_NineteenTwoThousandElevenEraCleanCoalProductionPlantsMember_lbl" xml:lang="en-US" id="id_10729326_2379020_1_1">Nineteen Two Thousand Eleven Era Clean Coal Production Plants [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_NineteenTwoThousandElevenEraCleanCoalProductionPlantsMember_lbl" xml:lang="en-US" id="id_10729326_2379020_2_1">Nineteen 2011 Era Clean Coal Plants [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_NineteenTwoThousandElevenEraCleanCoalProductionPlantsMember" xlink:to="ajg_NineteenTwoThousandElevenEraCleanCoalProductionPlantsMember_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_NoncompeteAgreementsMember" xlink:label="us-gaap_NoncompeteAgreementsMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_NoncompeteAgreementsMember_lbl" xml:lang="en-US" id="id_10729326_2034191_1_1">Noncompete Agreements [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_NoncompeteAgreementsMember_lbl" xml:lang="en-US" id="id_10729326_2034191_2_1">Non-Compete Agreements [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_NoncompeteAgreementsMember" xlink:to="us-gaap_NoncompeteAgreementsMember_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_NoncontrollingInterestMember" xlink:label="us-gaap_NoncontrollingInterestMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_NoncontrollingInterestMember_lbl" xml:lang="en-US" id="id_10729326_2041001_1_1">Noncontrolling Interest [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_NoncontrollingInterestMember_lbl" xml:lang="en-US" id="id_10729326_2041001_2_1">Noncontrolling Interests [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_NoncontrollingInterestMember" xlink:to="us-gaap_NoncontrollingInterestMember_lbl"/>
    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_NotePurchaseAgreementMember" xlink:label="ajg_NotePurchaseAgreementMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_NotePurchaseAgreementMember_lbl" xml:lang="en-US" id="id_10729326_2099243_3_1">Note Purchase Agreement [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_NotePurchaseAgreementMember_lbl" xml:lang="en-US" id="id_10729326_2099243_1_1">Note Purchase Agreement [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_NotePurchaseAgreementMember_lbl" xml:lang="en-US" id="id_10729326_2099243_2_1">Note Purchase Agreements [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_NotePurchaseAgreementMember" xlink:to="ajg_NotePurchaseAgreementMember_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_NotionalAmountOfDerivativesAbstract" xlink:label="us-gaap_NotionalAmountOfDerivativesAbstract"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_NotionalAmountOfDerivativesAbstract_lbl" xml:lang="en-US" id="id_10729326_2031243_1_1">Notional Disclosures [Abstract]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_NotionalAmountOfDerivativesAbstract_lbl" xml:lang="en-US" id="id_10729326_2031243_2_1">Notional Disclosures [Abstract]</label>
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    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_NumberOfBusinessesAcquired" xlink:label="us-gaap_NumberOfBusinessesAcquired"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_NumberOfBusinessesAcquired_lbl" xml:lang="en-US" id="id_10729326_2031660_1_1">Number of Businesses Acquired</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_NumberOfBusinessesAcquired_lbl" xml:lang="en-US" id="id_10729326_2031660_2_1">Number of companies acquired</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_NumberOfBusinessesAcquired" xlink:to="us-gaap_NumberOfBusinessesAcquired_lbl"/>
    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_NumberOfCoalPlants" xlink:label="ajg_NumberOfCoalPlants"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_NumberOfCoalPlants_lbl" xml:lang="en-US" id="id_10729326_2104887_3_1">Number of Coal Plants</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_NumberOfCoalPlants_lbl" xml:lang="en-US" id="id_10729326_2104887_1_1">Number Of Coal Plants</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_NumberOfCoalPlants_lbl" xml:lang="en-US" id="id_10729326_2104887_2_1">Number of coal plants</label>
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    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_NumberOfCountriesInWhichCompanyDoesBusinessThroughNetworkOfCorrespondentBrokersAndConsultants" xlink:label="ajg_NumberOfCountriesInWhichCompanyDoesBusinessThroughNetworkOfCorrespondentBrokersAndConsultants"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_NumberOfCountriesInWhichCompanyDoesBusinessThroughNetworkOfCorrespondentBrokersAndConsultants_lbl" xml:lang="en-US" id="id_10729326_2133339_3_1">Number of Countries in which the Company does Business through a Network of Correspondent Brokers and Consultants</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_NumberOfCountriesInWhichCompanyDoesBusinessThroughNetworkOfCorrespondentBrokersAndConsultants_lbl" xml:lang="en-US" id="id_10729326_2133339_1_1">Number Of Countries In Which Company Does Business Through Network Of Correspondent Brokers And Consultants</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_NumberOfCountriesInWhichCompanyDoesBusinessThroughNetworkOfCorrespondentBrokersAndConsultants_lbl" xml:lang="en-US" id="id_10729326_2133339_2_1">Number of countries in which the company does business through a network of correspondent brokers and consultants</label>
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    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_NumberOfCountriesInWhichCompanyHasOperations" xlink:label="ajg_NumberOfCountriesInWhichCompanyHasOperations"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_NumberOfCountriesInWhichCompanyHasOperations_lbl" xml:lang="en-US" id="id_10729326_2214793_3_1">Number of Countries in which the Company has Operations</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_NumberOfCountriesInWhichCompanyHasOperations_lbl" xml:lang="en-US" id="id_10729326_2214793_1_1">Number Of Countries In Which Company Has Operations</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_NumberOfCountriesInWhichCompanyHasOperations_lbl" xml:lang="en-US" id="id_10729326_2214793_2_1">Number of countries in which the company has operations</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_NumberOfCountriesInWhichCompanyHasOperations" xlink:to="ajg_NumberOfCountriesInWhichCompanyHasOperations_lbl"/>
    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_NumberOfEmployees" xlink:label="ajg_NumberOfEmployees"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_NumberOfEmployees_lbl" xml:lang="en-US" id="id_10729326_2211599_3_1">Number of employees.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_NumberOfEmployees_lbl" xml:lang="en-US" id="id_10729326_2211599_1_1">Number Of Employees</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_NumberOfEmployees_lbl" xml:lang="en-US" id="id_10729326_2211599_2_1">Number of employees will accommodate at new facility</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_NumberOfEmployees" xlink:to="ajg_NumberOfEmployees_lbl"/>
    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_NumberOfLetterOfCreditIssued" xlink:label="ajg_NumberOfLetterOfCreditIssued"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_NumberOfLetterOfCreditIssued_lbl" xml:lang="en-US" id="id_10729326_2140984_3_1">Number Of Letter Of Credit Issued</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_NumberOfLetterOfCreditIssued_lbl" xml:lang="en-US" id="id_10729326_2140984_1_1">Number Of Letter Of Credit Issued</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_NumberOfLetterOfCreditIssued_lbl" xml:lang="en-US" id="id_10729326_2140984_2_1">Number of letters of credit issued</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_NumberOfLetterOfCreditIssued" xlink:to="ajg_NumberOfLetterOfCreditIssued_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_NumberOfReportableSegments" xlink:label="us-gaap_NumberOfReportableSegments"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_NumberOfReportableSegments_lbl" xml:lang="en-US" id="id_10729326_2034760_1_1">Number of Reportable Segments</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_NumberOfReportableSegments_lbl" xml:lang="en-US" id="id_10729326_2034760_2_1">Number of reportable operating segments</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_NumberOfReportableSegments_lbl" xml:lang="en-US" id="id_10729326_2034760_12_1">Number of reportable segments</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_NumberOfReportableSegments" xlink:to="us-gaap_NumberOfReportableSegments_lbl"/>
    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_NumberOfSquareFeet" xlink:label="ajg_NumberOfSquareFeet"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_NumberOfSquareFeet_lbl" xml:lang="en-US" id="id_10729326_2321029_3_1">Number of square feet.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_NumberOfSquareFeet_lbl" xml:lang="en-US" id="id_10729326_2321029_1_1">Number Of Square Feet</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_NumberOfSquareFeet_lbl" xml:lang="en-US" id="id_10729326_2321029_2_1">Number of square feet</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_NumberOfSquareFeet" xlink:to="ajg_NumberOfSquareFeet_lbl"/>
    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_NumberOfVariableInterestEntities" xlink:label="ajg_NumberOfVariableInterestEntities"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_NumberOfVariableInterestEntities_lbl" xml:lang="en-US" id="id_10729326_2092676_3_1">Number of Variable Interest Entities</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_NumberOfVariableInterestEntities_lbl" xml:lang="en-US" id="id_10729326_2092676_1_1">Number Of Variable Interest Entities</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_NumberOfVariableInterestEntities_lbl" xml:lang="en-US" id="id_10729326_2092676_2_1">Number of variable interest entities</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_NumberOfVariableInterestEntities" xlink:to="ajg_NumberOfVariableInterestEntities_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/country/2016/country-2016-01-31.xsd#country_NZ" xlink:label="country_NZ"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="country_NZ_lbl" xml:lang="en-US" id="id_10729326_2028195_1_1">NEW ZEALAND</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="country_NZ_lbl" xml:lang="en-US" id="id_10729326_2028195_2_1">New Zealand [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="country_NZ" xlink:to="country_NZ_lbl"/>
    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_NzdDenominatedTrancheMember" xlink:label="ajg_NzdDenominatedTrancheMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_NzdDenominatedTrancheMember_lbl" xml:lang="en-US" id="id_10729326_2378906_3_1">NZD Denominated Tranche [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_NzdDenominatedTrancheMember_lbl" xml:lang="en-US" id="id_10729326_2378906_1_1">Nzd Denominated Tranche [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_NzdDenominatedTrancheMember_lbl" xml:lang="en-US" id="id_10729326_2378906_2_1">NZD denominated tranche [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_NzdDenominatedTrancheMember" xlink:to="ajg_NzdDenominatedTrancheMember_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_OfficerMember" xlink:label="us-gaap_OfficerMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_OfficerMember_lbl" xml:lang="en-US" id="id_10729326_2031035_1_1">Officer [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_OfficerMember_lbl" xml:lang="en-US" id="id_10729326_2031035_2_1">Officer and Key Employees [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OfficerMember" xlink:to="us-gaap_OfficerMember_lbl"/>
    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_OneTwoThousandElevenEraCleanCoalProductionPlantsMember" xlink:label="ajg_OneTwoThousandElevenEraCleanCoalProductionPlantsMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_OneTwoThousandElevenEraCleanCoalProductionPlantsMember_lbl" xml:lang="en-US" id="id_10729326_2373801_3_1">One Two Thousand Eleven Era Clean Coal Production Plant [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_OneTwoThousandElevenEraCleanCoalProductionPlantsMember_lbl" xml:lang="en-US" id="id_10729326_2373801_1_1">One Two Thousand Eleven Era Clean Coal Production Plants [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_OneTwoThousandElevenEraCleanCoalProductionPlantsMember_lbl" xml:lang="en-US" id="id_10729326_2373801_2_1">One 2011 Era Clean Coal Plant [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_OneTwoThousandElevenEraCleanCoalProductionPlantsMember" xlink:to="ajg_OneTwoThousandElevenEraCleanCoalProductionPlantsMember_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_OperatingExpenseMember" xlink:label="us-gaap_OperatingExpenseMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_OperatingExpenseMember_lbl" xml:lang="en-US" id="id_10729326_2034404_1_1">Operating Expense [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_OperatingExpenseMember_lbl" xml:lang="en-US" id="id_10729326_2034404_2_1">Operating Expense [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OperatingExpenseMember" xlink:to="us-gaap_OperatingExpenseMember_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_OperatingExpenses" xlink:label="us-gaap_OperatingExpenses"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_OperatingExpenses_lbl" xml:lang="en-US" id="id_10729326_2029967_1_1">Operating Expenses</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_OperatingExpenses_lbl" xml:lang="en-US" id="id_10729326_2029967_2_1">Operating</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OperatingExpenses" xlink:to="us-gaap_OperatingExpenses_lbl"/>
    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_OperatingLeaseCommitmentExpirationDate" xlink:label="ajg_OperatingLeaseCommitmentExpirationDate"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_OperatingLeaseCommitmentExpirationDate_lbl" xml:lang="en-US" id="id_10729326_2093839_3_1">Operating Lease Commitment, Expiration Date</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_OperatingLeaseCommitmentExpirationDate_lbl" xml:lang="en-US" id="id_10729326_2093839_1_1">Operating Lease Commitment Expiration Date</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_OperatingLeaseCommitmentExpirationDate_lbl" xml:lang="en-US" id="id_10729326_2093839_2_1">Operating lease commitment, expiration date</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_OperatingLeaseCommitmentExpirationDate" xlink:to="ajg_OperatingLeaseCommitmentExpirationDate_lbl"/>
    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_OperatingLeaseObligationMember" xlink:label="ajg_OperatingLeaseObligationMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_OperatingLeaseObligationMember_lbl" xml:lang="en-US" id="id_10729326_2316103_3_1">Operating Lease Obligation [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_OperatingLeaseObligationMember_lbl" xml:lang="en-US" id="id_10729326_2316103_1_1">Operating Lease Obligation [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_OperatingLeaseObligationMember_lbl" xml:lang="en-US" id="id_10729326_2316103_2_1">Operating Lease Obligations [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_OperatingLeaseObligationMember" xlink:to="ajg_OperatingLeaseObligationMember_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_OperatingSegmentsMember" xlink:label="us-gaap_OperatingSegmentsMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_OperatingSegmentsMember_lbl" xml:lang="en-US" id="id_10729326_2033412_1_1">Operating Segments [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_OperatingSegmentsMember_lbl" xml:lang="en-US" id="id_10729326_2033412_2_1">Operating Segments [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OperatingSegmentsMember" xlink:to="us-gaap_OperatingSegmentsMember_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_OptionIndexedToIssuersEquityTypeAxis" xlink:label="us-gaap_OptionIndexedToIssuersEquityTypeAxis"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_OptionIndexedToIssuersEquityTypeAxis_lbl" xml:lang="en-US" id="id_10729326_2028883_1_1">Option Indexed to Issuer's Equity, Type [Axis]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_OptionIndexedToIssuersEquityTypeAxis_lbl" xml:lang="en-US" id="id_10729326_2028883_2_1">Option Indexed to Issuer's Equity, Type [Axis]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OptionIndexedToIssuersEquityTypeAxis" xlink:to="us-gaap_OptionIndexedToIssuersEquityTypeAxis_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_OptionIndexedToIssuersEquityTypeDomain" xlink:label="us-gaap_OptionIndexedToIssuersEquityTypeDomain"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_OptionIndexedToIssuersEquityTypeDomain_lbl" xml:lang="en-US" id="id_10729326_2030606_1_1">Option Indexed to Issuer's Equity, Type [Domain]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_OptionIndexedToIssuersEquityTypeDomain_lbl" xml:lang="en-US" id="id_10729326_2030606_2_1">Option Indexed to Issuer's Equity, Type [Domain]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OptionIndexedToIssuersEquityTypeDomain" xlink:to="us-gaap_OptionIndexedToIssuersEquityTypeDomain_lbl"/>
    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_OptionsOrStockAppreciationRightsMember" xlink:label="ajg_OptionsOrStockAppreciationRightsMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_OptionsOrStockAppreciationRightsMember_lbl" xml:lang="en-US" id="id_10729326_2082178_3_1">Options or sock appreciation rights member.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_OptionsOrStockAppreciationRightsMember_lbl" xml:lang="en-US" id="id_10729326_2082178_1_1">Options or Stock Appreciation Rights [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_OptionsOrStockAppreciationRightsMember_lbl" xml:lang="en-US" id="id_10729326_2082178_2_1">Options or Stock Appreciation Rights [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_OptionsOrStockAppreciationRightsMember" xlink:to="ajg_OptionsOrStockAppreciationRightsMember_lbl"/>
    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_OptionsToPurchaseCommonStockSharesOutstanding" xlink:label="ajg_OptionsToPurchaseCommonStockSharesOutstanding"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_OptionsToPurchaseCommonStockSharesOutstanding_lbl" xml:lang="en-US" id="id_10729326_2295094_3_1">Options To Purchase Common Stock Shares Outstanding</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_OptionsToPurchaseCommonStockSharesOutstanding_lbl" xml:lang="en-US" id="id_10729326_2295094_1_1">Options To Purchase Common Stock Shares Outstanding</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_OptionsToPurchaseCommonStockSharesOutstanding_lbl" xml:lang="en-US" id="id_10729326_2295094_2_1">Options to purchase common stock shares outstanding</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_OptionsToPurchaseCommonStockSharesOutstanding" xlink:to="ajg_OptionsToPurchaseCommonStockSharesOutstanding_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract" xlink:label="us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract_lbl" xml:lang="en-US" id="id_10729326_2032787_1_1">Organization, Consolidation and Presentation of Financial Statements [Abstract]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract_lbl" xml:lang="en-US" id="id_10729326_2032787_2_1">Organization, Consolidation and Presentation of Financial Statements [Abstract]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract" xlink:to="us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureTextBlock" xlink:label="us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureTextBlock"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureTextBlock_lbl" xml:lang="en-US" id="id_10729326_2034201_1_1">Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureTextBlock_lbl" xml:lang="en-US" id="id_10729326_2034201_2_1">Nature of Operations and Basis of Presentation</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureTextBlock" xlink:to="us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureTextBlock_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_OtherAssetsCurrent" xlink:label="us-gaap_OtherAssetsCurrent"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_OtherAssetsCurrent_lbl" xml:lang="en-US" id="id_10729326_2029757_1_1">Other Assets, Current</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_OtherAssetsCurrent_lbl" xml:lang="en-US" id="id_10729326_2029757_2_1">Other current assets</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_OtherAssetsCurrent_lbl" xml:lang="en-US" id="id_10729326_2029757_6_1">Total other current assets</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OtherAssetsCurrent" xlink:to="us-gaap_OtherAssetsCurrent_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_OtherAssetsNoncurrent" xlink:label="us-gaap_OtherAssetsNoncurrent"/>
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    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_PaymentsForRepurchaseOfCommonStock_lbl" xml:lang="en-US" id="id_10729326_2031533_1_1">Payments for Repurchase of Common Stock</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="us-gaap_PaymentsForRepurchaseOfCommonStock_lbl" xml:lang="en-US" id="id_10729326_2031533_14_1">Repurchases of common stock</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_PaymentsForRepurchaseOfCommonStock" xlink:to="us-gaap_PaymentsForRepurchaseOfCommonStock_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_PaymentsOfDividendsCommonStock" xlink:label="us-gaap_PaymentsOfDividendsCommonStock"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_PaymentsOfDividendsCommonStock_lbl" xml:lang="en-US" id="id_10729326_2032826_1_1">Payments of Ordinary Dividends, Common Stock</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="us-gaap_PaymentsOfDividendsCommonStock_lbl" xml:lang="en-US" id="id_10729326_2032826_14_1">Dividends paid</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_PaymentsOfDividendsCommonStock" xlink:to="us-gaap_PaymentsOfDividendsCommonStock_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_PaymentsToAcquireBusinessesGross" xlink:label="us-gaap_PaymentsToAcquireBusinessesGross"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_PaymentsToAcquireBusinessesGross_lbl" xml:lang="en-US" id="id_10729326_2031069_1_1">Payments to Acquire Businesses, Gross</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_PaymentsToAcquireBusinessesGross_lbl" xml:lang="en-US" id="id_10729326_2031069_2_1">Cash Paid</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_PaymentsToAcquireBusinessesGross" xlink:to="us-gaap_PaymentsToAcquireBusinessesGross_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired" xlink:label="us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_lbl" xml:lang="en-US" id="id_10729326_2031535_1_1">Payments to Acquire Businesses, Net of Cash Acquired</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_lbl" xml:lang="en-US" id="id_10729326_2031535_14_1">Cash paid for acquisitions, net of cash acquired</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired" xlink:to="us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_PaymentsToAcquirePropertyPlantAndEquipment" xlink:label="us-gaap_PaymentsToAcquirePropertyPlantAndEquipment"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_lbl" xml:lang="en-US" id="id_10729326_2034791_1_1">Payments to Acquire Property, Plant, and Equipment</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_lbl" xml:lang="en-US" id="id_10729326_2034791_14_1">Net additions to fixed assets</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_PaymentsToAcquirePropertyPlantAndEquipment" xlink:to="us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_PaymentsToMinorityShareholders" xlink:label="us-gaap_PaymentsToMinorityShareholders"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_PaymentsToMinorityShareholders_lbl" xml:lang="en-US" id="id_10729326_2041048_1_1">Payments to Noncontrolling Interests</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="us-gaap_PaymentsToMinorityShareholders_lbl" xml:lang="en-US" id="id_10729326_2041048_14_1">Payments to noncontrolling interests</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_PaymentsToMinorityShareholders" xlink:to="us-gaap_PaymentsToMinorityShareholders_lbl"/>
    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_PerformanceBasedRestrictedStockMember" xlink:label="ajg_PerformanceBasedRestrictedStockMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_PerformanceBasedRestrictedStockMember_lbl" xml:lang="en-US" id="id_10729326_2364634_3_1">Performance-based Restricted Stock [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_PerformanceBasedRestrictedStockMember_lbl" xml:lang="en-US" id="id_10729326_2364634_1_1">Performance Based Restricted Stock [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_PerformanceBasedRestrictedStockMember_lbl" xml:lang="en-US" id="id_10729326_2364634_2_1">Performance-Based Restricted Stock [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_PerformanceBasedRestrictedStockMember" xlink:to="ajg_PerformanceBasedRestrictedStockMember_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_PerformanceSharesMember" xlink:label="us-gaap_PerformanceSharesMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_PerformanceSharesMember_lbl" xml:lang="en-US" id="id_10729326_2032567_1_1">Performance Shares [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_PerformanceSharesMember_lbl" xml:lang="en-US" id="id_10729326_2032567_2_1">Performance Shares [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_PerformanceSharesMember" xlink:to="us-gaap_PerformanceSharesMember_lbl"/>
    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_PeriodForOptionsToExpireFromDateOfGrant" xlink:label="ajg_PeriodForOptionsToExpireFromDateOfGrant"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_PeriodForOptionsToExpireFromDateOfGrant_lbl" xml:lang="en-US" id="id_10729326_2270515_3_1">Period for options to expire from date of grant.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_PeriodForOptionsToExpireFromDateOfGrant_lbl" xml:lang="en-US" id="id_10729326_2270515_1_1">Period For Options To Expire From Date Of Grant</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_PeriodForOptionsToExpireFromDateOfGrant_lbl" xml:lang="en-US" id="id_10729326_2270515_2_1">Maximum period for the exercise of stock options, years</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_PeriodForOptionsToExpireFromDateOfGrant" xlink:to="ajg_PeriodForOptionsToExpireFromDateOfGrant_lbl"/>
    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_PeriodOfServiceFromGrantDateStockOptionsAwardedNotSubjectToForfeiture" xlink:label="ajg_PeriodOfServiceFromGrantDateStockOptionsAwardedNotSubjectToForfeiture"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_PeriodOfServiceFromGrantDateStockOptionsAwardedNotSubjectToForfeiture_lbl" xml:lang="en-US" id="id_10729326_2097201_3_1">Period Of Service From Grant Date Stock Options Awarded Not Subject To Forfeiture</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_PeriodOfServiceFromGrantDateStockOptionsAwardedNotSubjectToForfeiture_lbl" xml:lang="en-US" id="id_10729326_2097201_1_1">Period Of Service From Grant Date Stock Options Awarded Not Subject To Forfeiture</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_PeriodOfServiceFromGrantDateStockOptionsAwardedNotSubjectToForfeiture_lbl" xml:lang="en-US" id="id_10729326_2097201_2_1">Period of service from grant date stock options awarded not subject to forfeiture</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_PeriodOfServiceFromGrantDateStockOptionsAwardedNotSubjectToForfeiture" xlink:to="ajg_PeriodOfServiceFromGrantDateStockOptionsAwardedNotSubjectToForfeiture_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_PlanNameAxis" xlink:label="us-gaap_PlanNameAxis"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_PlanNameAxis_lbl" xml:lang="en-US" id="id_10729326_2029102_1_1">Plan Name [Axis]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_PlanNameAxis_lbl" xml:lang="en-US" id="id_10729326_2029102_2_1">Plan Name [Axis]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_PlanNameAxis" xlink:to="us-gaap_PlanNameAxis_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_PlanNameDomain" xlink:label="us-gaap_PlanNameDomain"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_PlanNameDomain_lbl" xml:lang="en-US" id="id_10729326_2039004_1_1">Plan Name [Domain]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_PlanNameDomain_lbl" xml:lang="en-US" id="id_10729326_2039004_2_1">Plan Name [Domain]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_PlanNameDomain" xlink:to="us-gaap_PlanNameDomain_lbl"/>
    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_PremiumFinancingBorrowings" xlink:label="ajg_PremiumFinancingBorrowings"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_PremiumFinancingBorrowings_lbl" xml:lang="en-US" id="id_10729326_2300543_3_1">Premium financing borrowings.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_PremiumFinancingBorrowings_lbl" xml:lang="en-US" id="id_10729326_2300543_1_1">Premium Financing Borrowings</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_PremiumFinancingBorrowings_lbl" xml:lang="en-US" id="id_10729326_2300543_2_1">Premium financing debt</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_PremiumFinancingBorrowings" xlink:to="ajg_PremiumFinancingBorrowings_lbl"/>
    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_PremiumFinancingDebtFacilityMember" xlink:label="ajg_PremiumFinancingDebtFacilityMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_PremiumFinancingDebtFacilityMember_lbl" xml:lang="en-US" id="id_10729326_2272455_3_1">Premium Financing Debt Facility [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_PremiumFinancingDebtFacilityMember_lbl" xml:lang="en-US" id="id_10729326_2272455_1_1">Premium Financing Debt Facility [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_PremiumFinancingDebtFacilityMember_lbl" xml:lang="en-US" id="id_10729326_2272455_2_1">Premium Financing Debt Facility [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_PremiumFinancingDebtFacilityMember" xlink:to="ajg_PremiumFinancingDebtFacilityMember_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_PremiumsAndOtherReceivablesNet" xlink:label="us-gaap_PremiumsAndOtherReceivablesNet"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_PremiumsAndOtherReceivablesNet_lbl" xml:lang="en-US" id="id_10729326_2029354_1_1">Premiums and Other Receivables, Net</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_PremiumsAndOtherReceivablesNet_lbl" xml:lang="en-US" id="id_10729326_2029354_2_1">Premiums and fees receivable</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_PremiumsAndOtherReceivablesNet" xlink:to="us-gaap_PremiumsAndOtherReceivablesNet_lbl"/>
    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_PremiumsPayableToInsuranceAndReinsuranceCompanies" xlink:label="ajg_PremiumsPayableToInsuranceAndReinsuranceCompanies"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_PremiumsPayableToInsuranceAndReinsuranceCompanies_lbl" xml:lang="en-US" id="id_10729326_2200930_3_1">Premiums payable to insurance and reinsurance companies</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_PremiumsPayableToInsuranceAndReinsuranceCompanies_lbl" xml:lang="en-US" id="id_10729326_2200930_1_1">Premiums Payable To Insurance And Reinsurance Companies</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_PremiumsPayableToInsuranceAndReinsuranceCompanies_lbl" xml:lang="en-US" id="id_10729326_2200930_2_1">Premiums payable to insurance and reinsurance companies</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_PremiumsPayableToInsuranceAndReinsuranceCompanies" xlink:to="ajg_PremiumsPayableToInsuranceAndReinsuranceCompanies_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_PrepaidExpenseCurrent" xlink:label="us-gaap_PrepaidExpenseCurrent"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_PrepaidExpenseCurrent_lbl" xml:lang="en-US" id="id_10729326_2031939_1_1">Prepaid Expense, Current</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_PrepaidExpenseCurrent_lbl" xml:lang="en-US" id="id_10729326_2031939_2_1">Prepaid expenses</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_PrepaidExpenseCurrent" xlink:to="us-gaap_PrepaidExpenseCurrent_lbl"/>
    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_PresidioGroupIncMember" xlink:label="ajg_PresidioGroupIncMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_PresidioGroupIncMember_lbl" xml:lang="en-US" id="id_10729326_2428353_3_1">Presidio Group, Inc. (PG).</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_PresidioGroupIncMember_lbl" xml:lang="en-US" id="id_10729326_2428353_1_1">Presidio Group, Inc. [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_PresidioGroupIncMember_lbl" xml:lang="en-US" id="id_10729326_2428353_2_1">Presidio Group, Inc. [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_PresidioGroupIncMember" xlink:to="ajg_PresidioGroupIncMember_lbl"/>
    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_PrimeOrLiborPlusUpToOnePointFourFivePercentExpiresAprilEightTwoThousandSixteenMember" xlink:label="ajg_PrimeOrLiborPlusUpToOnePointFourFivePercentExpiresAprilEightTwoThousandSixteenMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_PrimeOrLiborPlusUpToOnePointFourFivePercentExpiresAprilEightTwoThousandSixteenMember_lbl" xml:lang="en-US" id="id_10729326_2391735_3_1">Prime Or Libor Plus Up To One Point Four Five Percent Expires April Eight Two Thousand Sixteen [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_PrimeOrLiborPlusUpToOnePointFourFivePercentExpiresAprilEightTwoThousandSixteenMember_lbl" xml:lang="en-US" id="id_10729326_2391735_1_1">Prime Or Libor Plus Up To One Point Four Five Percent Expires April Eight Two Thousand Sixteen [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_PrimeOrLiborPlusUpToOnePointFourFivePercentExpiresAprilEightTwoThousandSixteenMember_lbl" xml:lang="en-US" id="id_10729326_2391735_2_1">Prime or LIBOR plus up to 1.45%, expires April 8, 2016 [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_PrimeOrLiborPlusUpToOnePointFourFivePercentExpiresAprilEightTwoThousandSixteenMember" xlink:to="ajg_PrimeOrLiborPlusUpToOnePointFourFivePercentExpiresAprilEightTwoThousandSixteenMember_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ProceedsFromIssuanceOfCommonStock" xlink:label="us-gaap_ProceedsFromIssuanceOfCommonStock"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ProceedsFromIssuanceOfCommonStock_lbl" xml:lang="en-US" id="id_10729326_2035013_1_1">Proceeds from Issuance of Common Stock</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_ProceedsFromIssuanceOfCommonStock_lbl" xml:lang="en-US" id="id_10729326_2035013_2_1">Proceeds from issuance of common stock</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ProceedsFromIssuanceOfCommonStock" xlink:to="us-gaap_ProceedsFromIssuanceOfCommonStock_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ProceedsFromLinesOfCredit" xlink:label="us-gaap_ProceedsFromLinesOfCredit"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ProceedsFromLinesOfCredit_lbl" xml:lang="en-US" id="id_10729326_2031095_1_1">Proceeds from Lines of Credit</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_ProceedsFromLinesOfCredit_lbl" xml:lang="en-US" id="id_10729326_2031095_2_1">Borrowings on line of credit facility</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ProceedsFromLinesOfCredit" xlink:to="us-gaap_ProceedsFromLinesOfCredit_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ProceedsFromRepaymentsOfDebt" xlink:label="us-gaap_ProceedsFromRepaymentsOfDebt"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ProceedsFromRepaymentsOfDebt_lbl" xml:lang="en-US" id="id_10729326_2028936_1_1">Proceeds from (Repayments of) Debt</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_ProceedsFromRepaymentsOfDebt_lbl" xml:lang="en-US" id="id_10729326_2028936_2_1">Net borrowings on premium financing debt facility</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ProceedsFromRepaymentsOfDebt" xlink:to="us-gaap_ProceedsFromRepaymentsOfDebt_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ProductLiabilityContingencyAccrualPresentValue" xlink:label="us-gaap_ProductLiabilityContingencyAccrualPresentValue"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ProductLiabilityContingencyAccrualPresentValue_lbl" xml:lang="en-US" id="id_10729326_2028487_1_1">Product Liability Contingency, Accrual, Present Value</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_ProductLiabilityContingencyAccrualPresentValue_lbl" xml:lang="en-US" id="id_10729326_2028487_2_1">Actuarial range value</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ProductLiabilityContingencyAccrualPresentValue" xlink:to="us-gaap_ProductLiabilityContingencyAccrualPresentValue_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ProfitLoss" xlink:label="us-gaap_ProfitLoss"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ProfitLoss_lbl" xml:lang="en-US" id="id_10729326_2039475_1_1">Net Income (Loss), Including Portion Attributable to Noncontrolling Interest</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_ProfitLoss_lbl" xml:lang="en-US" id="id_10729326_2039475_2_1">Net earnings</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_ProfitLoss_lbl" xml:lang="en-US" id="id_10729326_2039475_6_1">Net earnings</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ProfitLoss" xlink:to="us-gaap_ProfitLoss_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_PropertyPlantAndEquipmentNet" xlink:label="us-gaap_PropertyPlantAndEquipmentNet"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_PropertyPlantAndEquipmentNet_lbl" xml:lang="en-US" id="id_10729326_2035024_1_1">Property, Plant and Equipment, Net</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_PropertyPlantAndEquipmentNet_lbl" xml:lang="en-US" id="id_10729326_2035024_2_1">Fixed assets - net</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_PropertyPlantAndEquipmentNet" xlink:to="us-gaap_PropertyPlantAndEquipmentNet_lbl"/>
    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_PropertyTaxCreditExpectToReceive" xlink:label="ajg_PropertyTaxCreditExpectToReceive"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_PropertyTaxCreditExpectToReceive_lbl" xml:lang="en-US" id="id_10729326_2214562_3_1">Property tax credit expect to receive.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_PropertyTaxCreditExpectToReceive_lbl" xml:lang="en-US" id="id_10729326_2214562_1_1">Property Tax Credit Expect To Receive</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_PropertyTaxCreditExpectToReceive_lbl" xml:lang="en-US" id="id_10729326_2214562_2_1">Property tax credit expect to receive</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_PropertyTaxCreditExpectToReceive" xlink:to="ajg_PropertyTaxCreditExpectToReceive_lbl"/>
    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_PropertyTaxCreditExpectToReceivePeriod" xlink:label="ajg_PropertyTaxCreditExpectToReceivePeriod"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_PropertyTaxCreditExpectToReceivePeriod_lbl" xml:lang="en-US" id="id_10729326_2202947_3_1">Property tax credit expect to receive period.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_PropertyTaxCreditExpectToReceivePeriod_lbl" xml:lang="en-US" id="id_10729326_2202947_1_1">Property Tax Credit Expect To Receive Period</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_PropertyTaxCreditExpectToReceivePeriod_lbl" xml:lang="en-US" id="id_10729326_2202947_2_1">Property tax credit expect to receive period</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_PropertyTaxCreditExpectToReceivePeriod" xlink:to="ajg_PropertyTaxCreditExpectToReceivePeriod_lbl"/>
    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_ProvisionalCompensationCashAwardApprovedForFutureGrantByCompensationCommitteeUnits" xlink:label="ajg_ProvisionalCompensationCashAwardApprovedForFutureGrantByCompensationCommitteeUnits"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_ProvisionalCompensationCashAwardApprovedForFutureGrantByCompensationCommitteeUnits_lbl" xml:lang="en-US" id="id_10729326_2174325_3_1">Provisional compensation cash award approved for future grant by compensation committee, units</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_ProvisionalCompensationCashAwardApprovedForFutureGrantByCompensationCommitteeUnits_lbl" xml:lang="en-US" id="id_10729326_2174325_1_1">Provisional Compensation Cash Award Approved For Future Grant By Compensation Committee Units</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_ProvisionalCompensationCashAwardApprovedForFutureGrantByCompensationCommitteeUnits_lbl" xml:lang="en-US" id="id_10729326_2174325_2_1">Provisional compensation cash award approved for future grant by compensation committee, units</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_ProvisionalCompensationCashAwardApprovedForFutureGrantByCompensationCommitteeUnits" xlink:to="ajg_ProvisionalCompensationCashAwardApprovedForFutureGrantByCompensationCommitteeUnits_lbl"/>
    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_ProvisionalCompensationCashAwardApprovedForFutureGrantByCompensationCommitteeValue" xlink:label="ajg_ProvisionalCompensationCashAwardApprovedForFutureGrantByCompensationCommitteeValue"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_ProvisionalCompensationCashAwardApprovedForFutureGrantByCompensationCommitteeValue_lbl" xml:lang="en-US" id="id_10729326_2059924_3_1">Provisional Compensation Cash Award Approved for Future Grant by Compensation Committee, Value</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_ProvisionalCompensationCashAwardApprovedForFutureGrantByCompensationCommitteeValue_lbl" xml:lang="en-US" id="id_10729326_2059924_1_1">Provisional Compensation Cash Award Approved For Future Grant By Compensation Committee Value</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_ProvisionalCompensationCashAwardApprovedForFutureGrantByCompensationCommitteeValue_lbl" xml:lang="en-US" id="id_10729326_2059924_2_1">Provisional compensation cash awards approved for future grant by compensation committee, value</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_ProvisionalCompensationCashAwardApprovedForFutureGrantByCompensationCommitteeValue" xlink:to="ajg_ProvisionalCompensationCashAwardApprovedForFutureGrantByCompensationCommitteeValue_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_PutOptionMember" xlink:label="us-gaap_PutOptionMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_PutOptionMember_lbl" xml:lang="en-US" id="id_10729326_2030439_1_1">Put Option [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_PutOptionMember_lbl" xml:lang="en-US" id="id_10729326_2030439_2_1">Put Options [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_PutOptionMember" xlink:to="us-gaap_PutOptionMember_lbl"/>
    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_Range01Member" xlink:label="ajg_Range01Member"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_Range01Member_lbl" xml:lang="en-US" id="id_10729326_2298259_3_1">Range 01 [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_Range01Member_lbl" xml:lang="en-US" id="id_10729326_2298259_1_1">Range 01 [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_Range01Member_lbl" xml:lang="en-US" id="id_10729326_2298259_2_1">Exercise Prices Range $ 23.76 - $ 39.17 [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_Range01Member" xlink:to="ajg_Range01Member_lbl"/>
    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_Range02Member" xlink:label="ajg_Range02Member"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_Range02Member_lbl" xml:lang="en-US" id="id_10729326_2122589_3_1">Range 02 [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_Range02Member_lbl" xml:lang="en-US" id="id_10729326_2122589_1_1">Range 02 [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_Range02Member_lbl" xml:lang="en-US" id="id_10729326_2122589_2_1">Exercise Prices Range $ 43.71 - $ 46.17 [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_Range02Member" xlink:to="ajg_Range02Member_lbl"/>
    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_Range03Member" xlink:label="ajg_Range03Member"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_Range03Member_lbl" xml:lang="en-US" id="id_10729326_2311096_3_1">Range 03 [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_Range03Member_lbl" xml:lang="en-US" id="id_10729326_2311096_1_1">Range 03 [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_Range03Member_lbl" xml:lang="en-US" id="id_10729326_2311096_2_1">Exercise Prices Range $ 46.87 - $ 49.55 [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_Range03Member" xlink:to="ajg_Range03Member_lbl"/>
    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_Range04Member" xlink:label="ajg_Range04Member"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_Range04Member_lbl" xml:lang="en-US" id="id_10729326_2104950_3_1">Range 04 [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_Range04Member_lbl" xml:lang="en-US" id="id_10729326_2104950_1_1">Range 04 [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_Range04Member_lbl" xml:lang="en-US" id="id_10729326_2104950_2_1">Exercise Prices Range $ 56.86 - $ 56.86 [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_Range04Member" xlink:to="ajg_Range04Member_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_RangeAxis" xlink:label="us-gaap_RangeAxis"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_RangeAxis_lbl" xml:lang="en-US" id="id_10729326_2028497_1_1">Range [Axis]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_RangeAxis_lbl" xml:lang="en-US" id="id_10729326_2028497_2_1">Range [Axis]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_RangeAxis" xlink:to="us-gaap_RangeAxis_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_RangeMember" xlink:label="us-gaap_RangeMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_RangeMember_lbl" xml:lang="en-US" id="id_10729326_2030442_1_1">Range [Domain]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_RangeMember_lbl" xml:lang="en-US" id="id_10729326_2030442_2_1">Range [Domain]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_RangeMember" xlink:to="us-gaap_RangeMember_lbl"/>
    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_RecordedEarnOutPayable" xlink:label="ajg_RecordedEarnOutPayable"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_RecordedEarnOutPayable_lbl" xml:lang="en-US" id="id_10729326_2278563_3_1">Recorded Earnout Payable</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_RecordedEarnOutPayable_lbl" xml:lang="en-US" id="id_10729326_2278563_1_1">Recorded Earn Out Payable</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_RecordedEarnOutPayable_lbl" xml:lang="en-US" id="id_10729326_2278563_2_1">Recorded Earnout Payable</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_RecordedEarnOutPayable" xlink:to="ajg_RecordedEarnOutPayable_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_RecordedUnconditionalPurchaseObligation" xlink:label="us-gaap_RecordedUnconditionalPurchaseObligation"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_RecordedUnconditionalPurchaseObligation_lbl" xml:lang="en-US" id="id_10729326_2035659_1_1">Recorded Unconditional Purchase Obligation</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_RecordedUnconditionalPurchaseObligation_lbl" xml:lang="en-US" id="id_10729326_2035659_2_1">Contractual Obligations, Payments Due by Period, Total</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_RecordedUnconditionalPurchaseObligation_lbl" xml:lang="en-US" id="id_10729326_2035659_6_1">Contractual Obligations, Payments Due by Period, Total</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_RecordedUnconditionalPurchaseObligation" xlink:to="us-gaap_RecordedUnconditionalPurchaseObligation_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_RecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis" xlink:label="us-gaap_RecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_RecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis_lbl" xml:lang="en-US" id="id_10729326_2037466_1_1">Recorded Unconditional Purchase Obligation by Category of Item Purchased [Axis]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_RecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis_lbl" xml:lang="en-US" id="id_10729326_2037466_2_1">Recorded Unconditional Purchase Obligation by Category of Item Purchased [Axis]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_RecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis" xlink:to="us-gaap_RecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_RecordedUnconditionalPurchaseObligationDueAfterFifthYear" xlink:label="us-gaap_RecordedUnconditionalPurchaseObligationDueAfterFifthYear"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_RecordedUnconditionalPurchaseObligationDueAfterFifthYear_lbl" xml:lang="en-US" id="id_10729326_2028505_1_1">Recorded Unconditional Purchase Obligation Due after Fifth Year</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_RecordedUnconditionalPurchaseObligationDueAfterFifthYear_lbl" xml:lang="en-US" id="id_10729326_2028505_2_1">Contractual Obligations, Payments Due by Period, Thereafter</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_RecordedUnconditionalPurchaseObligationDueAfterFifthYear" xlink:to="us-gaap_RecordedUnconditionalPurchaseObligationDueAfterFifthYear_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_RecordedUnconditionalPurchaseObligationDueInFifthYear" xlink:label="us-gaap_RecordedUnconditionalPurchaseObligationDueInFifthYear"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_RecordedUnconditionalPurchaseObligationDueInFifthYear_lbl" xml:lang="en-US" id="id_10729326_2040683_1_1">Recorded Unconditional Purchase Obligation Due in Fifth Year</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_RecordedUnconditionalPurchaseObligationDueInFifthYear_lbl" xml:lang="en-US" id="id_10729326_2040683_2_1">Contractual Obligations, Payments Due by Period, 2021</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_RecordedUnconditionalPurchaseObligationDueInFifthYear" xlink:to="us-gaap_RecordedUnconditionalPurchaseObligationDueInFifthYear_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_RecordedUnconditionalPurchaseObligationDueInFourthYear" xlink:label="us-gaap_RecordedUnconditionalPurchaseObligationDueInFourthYear"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_RecordedUnconditionalPurchaseObligationDueInFourthYear_lbl" xml:lang="en-US" id="id_10729326_2030456_1_1">Recorded Unconditional Purchase Obligation Due in Fourth Year</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_RecordedUnconditionalPurchaseObligationDueInFourthYear_lbl" xml:lang="en-US" id="id_10729326_2030456_2_1">Contractual Obligations, Payments Due by Period, 2020</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_RecordedUnconditionalPurchaseObligationDueInFourthYear" xlink:to="us-gaap_RecordedUnconditionalPurchaseObligationDueInFourthYear_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_RecordedUnconditionalPurchaseObligationDueInSecondYear" xlink:label="us-gaap_RecordedUnconditionalPurchaseObligationDueInSecondYear"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_RecordedUnconditionalPurchaseObligationDueInSecondYear_lbl" xml:lang="en-US" id="id_10729326_2038050_1_1">Recorded Unconditional Purchase Obligation Due in Second Year</label>
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    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_RecordedUnconditionalPurchaseObligationDueInSecondYear" xlink:to="us-gaap_RecordedUnconditionalPurchaseObligationDueInSecondYear_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_RecordedUnconditionalPurchaseObligationDueInThirdYear" xlink:label="us-gaap_RecordedUnconditionalPurchaseObligationDueInThirdYear"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_RecordedUnconditionalPurchaseObligationDueInThirdYear_lbl" xml:lang="en-US" id="id_10729326_2037121_1_1">Recorded Unconditional Purchase Obligation Due in Third Year</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_RecordedUnconditionalPurchaseObligationDueInThirdYear_lbl" xml:lang="en-US" id="id_10729326_2037121_2_1">Contractual Obligations, Payments Due by Period, 2019</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_RecordedUnconditionalPurchaseObligationDueInThirdYear" xlink:to="us-gaap_RecordedUnconditionalPurchaseObligationDueInThirdYear_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_RecordedUnconditionalPurchaseObligationDueWithinOneYear" xlink:label="us-gaap_RecordedUnconditionalPurchaseObligationDueWithinOneYear"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_RecordedUnconditionalPurchaseObligationDueWithinOneYear_lbl" xml:lang="en-US" id="id_10729326_2035482_1_1">Recorded Unconditional Purchase Obligation Due in Next Twelve Months</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_RecordedUnconditionalPurchaseObligationDueWithinOneYear_lbl" xml:lang="en-US" id="id_10729326_2035482_2_1">Contractual Obligations, Payments Due by Period, 2017</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_RecordedUnconditionalPurchaseObligationDueWithinOneYear" xlink:to="us-gaap_RecordedUnconditionalPurchaseObligationDueWithinOneYear_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_RecordedUnconditionalPurchaseObligationsTextBlock" xlink:label="us-gaap_RecordedUnconditionalPurchaseObligationsTextBlock"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_RecordedUnconditionalPurchaseObligationsTextBlock_lbl" xml:lang="en-US" id="id_10729326_2037122_1_1">Recorded Unconditional Purchase Obligations [Table Text Block]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_RecordedUnconditionalPurchaseObligationsTextBlock_lbl" xml:lang="en-US" id="id_10729326_2037122_2_1">Contractual Obligations</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_RecordedUnconditionalPurchaseObligationsTextBlock" xlink:to="us-gaap_RecordedUnconditionalPurchaseObligationsTextBlock_lbl"/>
    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_RefinedCoalProductionRelatedReceivablesCurrent" xlink:label="ajg_RefinedCoalProductionRelatedReceivablesCurrent"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_RefinedCoalProductionRelatedReceivablesCurrent_lbl" xml:lang="en-US" id="id_10729326_2105806_3_1">Refined Coal Production Related Receivables Current</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_RefinedCoalProductionRelatedReceivablesCurrent_lbl" xml:lang="en-US" id="id_10729326_2105806_1_1">Refined Coal Production Related Receivables Current</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_RefinedCoalProductionRelatedReceivablesCurrent_lbl" xml:lang="en-US" id="id_10729326_2105806_2_1">Refined coal production related receivables</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_RefinedCoalProductionRelatedReceivablesCurrent" xlink:to="ajg_RefinedCoalProductionRelatedReceivablesCurrent_lbl"/>
    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_RentCaptiveFacilityMember" xlink:label="ajg_RentCaptiveFacilityMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_RentCaptiveFacilityMember_lbl" xml:lang="en-US" id="id_10729326_2047615_3_1">Rent-a-captive Facility [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_RentCaptiveFacilityMember_lbl" xml:lang="en-US" id="id_10729326_2047615_1_1">Rent Captive Facility [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_RentCaptiveFacilityMember_lbl" xml:lang="en-US" id="id_10729326_2047615_2_1">Rent-A-Captive Facility [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_RentCaptiveFacilityMember" xlink:to="ajg_RentCaptiveFacilityMember_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_RepaymentsOfLinesOfCredit" xlink:label="us-gaap_RepaymentsOfLinesOfCredit"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_RepaymentsOfLinesOfCredit_lbl" xml:lang="en-US" id="id_10729326_2039874_1_1">Repayments of Lines of Credit</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="us-gaap_RepaymentsOfLinesOfCredit_lbl" xml:lang="en-US" id="id_10729326_2039874_14_1">Repayments on line of credit facility</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_RepaymentsOfLinesOfCredit" xlink:to="us-gaap_RepaymentsOfLinesOfCredit_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_RestatementAdjustmentMember" xlink:label="us-gaap_RestatementAdjustmentMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_RestatementAdjustmentMember_lbl" xml:lang="en-US" id="id_10729326_2039289_1_1">Restatement Adjustment [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_RestatementAdjustmentMember_lbl" xml:lang="en-US" id="id_10729326_2039289_2_1">Restatement Adjustment [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_RestatementAdjustmentMember" xlink:to="us-gaap_RestatementAdjustmentMember_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue" xlink:label="us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue_lbl" xml:lang="en-US" id="id_10729326_2039290_1_1">Restricted Cash and Cash Equivalents, Current</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue_lbl" xml:lang="en-US" id="id_10729326_2039290_2_1">Restricted cash</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue" xlink:to="us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue_lbl"/>
    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_RestrictedStockAndCashAwardsTextBlock" xlink:label="ajg_RestrictedStockAndCashAwardsTextBlock"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_RestrictedStockAndCashAwardsTextBlock_lbl" xml:lang="en-US" id="id_10729326_2267425_3_1">Restricted Stock and Cash Awards</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_RestrictedStockAndCashAwardsTextBlock_lbl" xml:lang="en-US" id="id_10729326_2267425_1_1">Restricted Stock And Cash Awards [Text Block]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_RestrictedStockAndCashAwardsTextBlock_lbl" xml:lang="en-US" id="id_10729326_2267425_2_1">Restricted Stock, Performance Share and Cash Awards</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_RestrictedStockAndCashAwardsTextBlock" xlink:to="ajg_RestrictedStockAndCashAwardsTextBlock_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_RestrictedStockExpense" xlink:label="us-gaap_RestrictedStockExpense"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_RestrictedStockExpense_lbl" xml:lang="en-US" id="id_10729326_2040272_1_1">Restricted Stock or Unit Expense</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_RestrictedStockExpense_lbl" xml:lang="en-US" id="id_10729326_2040272_2_1">Restricted stock or unit expense</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_RestrictedStockExpense" xlink:to="us-gaap_RestrictedStockExpense_lbl"/>
    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_RestrictedStockPlanMember" xlink:label="ajg_RestrictedStockPlanMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_RestrictedStockPlanMember_lbl" xml:lang="en-US" id="id_10729326_2313866_3_1">Restricted stock plan.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_RestrictedStockPlanMember_lbl" xml:lang="en-US" id="id_10729326_2313866_1_1">Restricted Stock Plan [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_RestrictedStockPlanMember_lbl" xml:lang="en-US" id="id_10729326_2313866_2_1">Restricted Stock Plan [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_RestrictedStockPlanMember" xlink:to="ajg_RestrictedStockPlanMember_lbl"/>
    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_RestrictedStockUnitsRsusMember" xlink:label="ajg_RestrictedStockUnitsRsusMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_RestrictedStockUnitsRsusMember_lbl" xml:lang="en-US" id="id_10729326_2050045_3_1">Restricted stock units (RSUs) as awarded by a company to their employees as a form of incentive compensation.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_RestrictedStockUnitsRsusMember_lbl" xml:lang="en-US" id="id_10729326_2050045_1_1">Restricted Stock Units Rsus [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_RestrictedStockUnitsRsusMember_lbl" xml:lang="en-US" id="id_10729326_2050045_2_1">Restricted Stock Units (RSUs) [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_RestrictedStockUnitsRsusMember" xlink:to="ajg_RestrictedStockUnitsRsusMember_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_RetainedEarningsAccumulatedDeficit" xlink:label="us-gaap_RetainedEarningsAccumulatedDeficit"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_RetainedEarningsAccumulatedDeficit_lbl" xml:lang="en-US" id="id_10729326_2037317_1_1">Retained Earnings (Accumulated Deficit)</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_RetainedEarningsAccumulatedDeficit_lbl" xml:lang="en-US" id="id_10729326_2037317_2_1">Retained earnings</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_RetainedEarningsAccumulatedDeficit" xlink:to="us-gaap_RetainedEarningsAccumulatedDeficit_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_RetainedEarningsMember" xlink:label="us-gaap_RetainedEarningsMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_RetainedEarningsMember_lbl" xml:lang="en-US" id="id_10729326_2037658_1_1">Retained Earnings [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_RetainedEarningsMember_lbl" xml:lang="en-US" id="id_10729326_2037658_2_1">Retained Earnings [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_RetainedEarningsMember" xlink:to="us-gaap_RetainedEarningsMember_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_RevenueRecognitionPolicyTextBlock" xlink:label="us-gaap_RevenueRecognitionPolicyTextBlock"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_RevenueRecognitionPolicyTextBlock_lbl" xml:lang="en-US" id="id_10729326_2039697_1_1">Revenue Recognition, Policy [Policy Text Block]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_RevenueRecognitionPolicyTextBlock_lbl" xml:lang="en-US" id="id_10729326_2039697_2_1">Revenue Recognition</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_RevenueRecognitionPolicyTextBlock" xlink:to="us-gaap_RevenueRecognitionPolicyTextBlock_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_Revenues" xlink:label="us-gaap_Revenues"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_Revenues_lbl" xml:lang="en-US" id="id_10729326_2028297_1_1">Revenues</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_Revenues_lbl" xml:lang="en-US" id="id_10729326_2028297_2_1">Total revenues</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_Revenues_lbl" xml:lang="en-US" id="id_10729326_2028297_6_1">Total revenues</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_Revenues" xlink:to="us-gaap_Revenues_lbl"/>
    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_RevenuesFromCleanCoalActivities" xlink:label="ajg_RevenuesFromCleanCoalActivities"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_RevenuesFromCleanCoalActivities_lbl" xml:lang="en-US" id="id_10729326_2125466_3_1">Revenues from clean-coal activities</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_RevenuesFromCleanCoalActivities_lbl" xml:lang="en-US" id="id_10729326_2125466_1_1">Revenues From Clean Coal Activities</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_RevenuesFromCleanCoalActivities_lbl" xml:lang="en-US" id="id_10729326_2125466_2_1">Revenues from clean coal activities</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_RevenuesFromCleanCoalActivities" xlink:to="ajg_RevenuesFromCleanCoalActivities_lbl"/>
    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_RiskManagementSegmentMember" xlink:label="ajg_RiskManagementSegmentMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_RiskManagementSegmentMember_lbl" xml:lang="en-US" id="id_10729326_2238393_3_1">Risk Management Segment Member</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_RiskManagementSegmentMember_lbl" xml:lang="en-US" id="id_10729326_2238393_1_1">Risk Management Segment [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_RiskManagementSegmentMember_lbl" xml:lang="en-US" id="id_10729326_2238393_2_1">Risk Management [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_RiskManagementSegmentMember" xlink:to="ajg_RiskManagementSegmentMember_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ScenarioForecastMember" xlink:label="us-gaap_ScenarioForecastMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ScenarioForecastMember_lbl" xml:lang="en-US" id="id_10729326_2038269_1_1">Scenario, Forecast [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_ScenarioForecastMember_lbl" xml:lang="en-US" id="id_10729326_2038269_2_1">Scenario, Forecast [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ScenarioForecastMember" xlink:to="us-gaap_ScenarioForecastMember_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ScenarioUnspecifiedDomain" xlink:label="us-gaap_ScenarioUnspecifiedDomain"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ScenarioUnspecifiedDomain_lbl" xml:lang="en-US" id="id_10729326_2036952_1_1">Scenario, Unspecified [Domain]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_ScenarioUnspecifiedDomain_lbl" xml:lang="en-US" id="id_10729326_2036952_2_1">Scenario, Unspecified [Domain]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ScenarioUnspecifiedDomain" xlink:to="us-gaap_ScenarioUnspecifiedDomain_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ScheduleOfAccumulatedOtherComprehensiveIncomeLossTableTextBlock" xlink:label="us-gaap_ScheduleOfAccumulatedOtherComprehensiveIncomeLossTableTextBlock"/>
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    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeTable" xlink:label="us-gaap_ScheduleOfShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeTable"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ScheduleOfShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeTable_lbl" xml:lang="en-US" id="id_10729326_2035708_1_1">Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_ScheduleOfShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeTable_lbl" xml:lang="en-US" id="id_10729326_2035708_2_1">Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ScheduleOfShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeTable" xlink:to="us-gaap_ScheduleOfShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeTable_lbl"/>
    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_ScheduleOfStockOptionActivityAndRelatedInformationTableTextBlock" xlink:label="ajg_ScheduleOfStockOptionActivityAndRelatedInformationTableTextBlock"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_ScheduleOfStockOptionActivityAndRelatedInformationTableTextBlock_lbl" xml:lang="en-US" id="id_10729326_2069901_3_1">Schedule of Stock Option Activity and Related Information [Table Text Block]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_ScheduleOfStockOptionActivityAndRelatedInformationTableTextBlock_lbl" xml:lang="en-US" id="id_10729326_2069901_1_1">Schedule Of Stock Option Activity And Related Information [Table Text Block]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_ScheduleOfStockOptionActivityAndRelatedInformationTableTextBlock_lbl" xml:lang="en-US" id="id_10729326_2069901_2_1">Stock Option Activity and Related Information</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_ScheduleOfStockOptionActivityAndRelatedInformationTableTextBlock" xlink:to="ajg_ScheduleOfStockOptionActivityAndRelatedInformationTableTextBlock_lbl"/>
    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_ScheduleOfStockOptionsOutstandingAndExercisableTableTextBlock" xlink:label="ajg_ScheduleOfStockOptionsOutstandingAndExercisableTableTextBlock"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_ScheduleOfStockOptionsOutstandingAndExercisableTableTextBlock_lbl" xml:lang="en-US" id="id_10729326_2209121_3_1">Schedule of Stock Options Outstanding and Exercisable [Table Text Block]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_ScheduleOfStockOptionsOutstandingAndExercisableTableTextBlock_lbl" xml:lang="en-US" id="id_10729326_2209121_1_1">Schedule Of Stock Options Outstanding And Exercisable [Table Text Block]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_ScheduleOfStockOptionsOutstandingAndExercisableTableTextBlock_lbl" xml:lang="en-US" id="id_10729326_2209121_2_1">Other Information Regarding Stock Options Outstanding and Exercisable</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_ScheduleOfStockOptionsOutstandingAndExercisableTableTextBlock" xlink:to="ajg_ScheduleOfStockOptionsOutstandingAndExercisableTableTextBlock_lbl"/>
    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_SecondInstallmentMember" xlink:label="ajg_SecondInstallmentMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_SecondInstallmentMember_lbl" xml:lang="en-US" id="id_10729326_2053757_3_1">Second Installment [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_SecondInstallmentMember_lbl" xml:lang="en-US" id="id_10729326_2053757_1_1">Second Installment [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_SecondInstallmentMember_lbl" xml:lang="en-US" id="id_10729326_2053757_2_1">Second Installment [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_SecondInstallmentMember" xlink:to="ajg_SecondInstallmentMember_lbl"/>
    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_SecurityDepositMember" xlink:label="ajg_SecurityDepositMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_SecurityDepositMember_lbl" xml:lang="en-US" id="id_10729326_2112269_3_1">Security Deposit [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_SecurityDepositMember_lbl" xml:lang="en-US" id="id_10729326_2112269_1_1">Security Deposit [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_SecurityDepositMember_lbl" xml:lang="en-US" id="id_10729326_2112269_2_1">Security Deposit [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_SecurityDepositMember" xlink:to="ajg_SecurityDepositMember_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_SegmentDomain" xlink:label="us-gaap_SegmentDomain"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_SegmentDomain_lbl" xml:lang="en-US" id="id_10729326_2039911_1_1">Segments [Domain]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_SegmentDomain_lbl" xml:lang="en-US" id="id_10729326_2039911_2_1">Segments [Domain]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_SegmentDomain" xlink:to="us-gaap_SegmentDomain_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_SegmentGeographicalDomain" xlink:label="us-gaap_SegmentGeographicalDomain"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_SegmentGeographicalDomain_lbl" xml:lang="en-US" id="id_10729326_2034488_1_1">Geographical [Domain]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_SegmentGeographicalDomain_lbl" xml:lang="en-US" id="id_10729326_2034488_2_1">Geographical [Domain]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_SegmentGeographicalDomain" xlink:to="us-gaap_SegmentGeographicalDomain_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_SegmentReportingAbstract" xlink:label="us-gaap_SegmentReportingAbstract"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_SegmentReportingAbstract_lbl" xml:lang="en-US" id="id_10729326_2039912_1_1">Segment Reporting [Abstract]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_SegmentReportingAbstract_lbl" xml:lang="en-US" id="id_10729326_2039912_2_1">Segment Reporting [Abstract]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_SegmentReportingAbstract" xlink:to="us-gaap_SegmentReportingAbstract_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_SegmentReportingDisclosureTextBlock" xlink:label="us-gaap_SegmentReportingDisclosureTextBlock"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_SegmentReportingDisclosureTextBlock_lbl" xml:lang="en-US" id="id_10729326_2039114_1_1">Segment Reporting Disclosure [Text Block]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_SegmentReportingDisclosureTextBlock_lbl" xml:lang="en-US" id="id_10729326_2039114_2_1">Segment Information</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_SegmentReportingDisclosureTextBlock" xlink:to="us-gaap_SegmentReportingDisclosureTextBlock_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_SegmentReportingInformationLineItems" xlink:label="us-gaap_SegmentReportingInformationLineItems"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_SegmentReportingInformationLineItems_lbl" xml:lang="en-US" id="id_10729326_2039533_1_1">Segment Reporting Information [Line Items]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_SegmentReportingInformationLineItems_lbl" xml:lang="en-US" id="id_10729326_2039533_2_1">Segment Reporting Information [Line Items]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_SegmentReportingInformationLineItems" xlink:to="us-gaap_SegmentReportingInformationLineItems_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_SegmentReportingPolicyPolicyTextBlock" xlink:label="us-gaap_SegmentReportingPolicyPolicyTextBlock"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_SegmentReportingPolicyPolicyTextBlock_lbl" xml:lang="en-US" id="id_10729326_2035536_1_1">Segment Reporting, Policy [Policy Text Block]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_SegmentReportingPolicyPolicyTextBlock_lbl" xml:lang="en-US" id="id_10729326_2035536_2_1">Segment Reporting</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_SegmentReportingPolicyPolicyTextBlock" xlink:to="us-gaap_SegmentReportingPolicyPolicyTextBlock_lbl"/>
    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_SelfInsuranceDeductiblesMember" xlink:label="ajg_SelfInsuranceDeductiblesMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_SelfInsuranceDeductiblesMember_lbl" xml:lang="en-US" id="id_10729326_2313026_3_1">Self-Insurance Deductibles [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_SelfInsuranceDeductiblesMember_lbl" xml:lang="en-US" id="id_10729326_2313026_1_1">Self Insurance Deductibles [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_SelfInsuranceDeductiblesMember_lbl" xml:lang="en-US" id="id_10729326_2313026_2_1">Self-Insurance Deductibles [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_SelfInsuranceDeductiblesMember" xlink:to="ajg_SelfInsuranceDeductiblesMember_lbl"/>
    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_SemiAnnualPaymentsOfInterest" xlink:label="ajg_SemiAnnualPaymentsOfInterest"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_SemiAnnualPaymentsOfInterest_lbl" xml:lang="en-US" id="id_10729326_2299160_3_1">Semi-Annual Payments of Interest</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_SemiAnnualPaymentsOfInterest_lbl" xml:lang="en-US" id="id_10729326_2299160_1_1">Semi Annual Payments Of Interest</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_SemiAnnualPaymentsOfInterest_lbl" xml:lang="en-US" id="id_10729326_2299160_2_1">Semi-annual payments of interest</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_SemiAnnualPaymentsOfInterest" xlink:to="ajg_SemiAnnualPaymentsOfInterest_lbl"/>
    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_SemiAnnualPaymentsOfInterestNet" xlink:label="ajg_SemiAnnualPaymentsOfInterestNet"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_SemiAnnualPaymentsOfInterestNet_lbl" xml:lang="en-US" id="id_10729326_2420934_3_1">Semi annual payments of interest net.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_SemiAnnualPaymentsOfInterestNet_lbl" xml:lang="en-US" id="id_10729326_2420934_1_1">Semi Annual Payments Of Interest Net</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_SemiAnnualPaymentsOfInterestNet_lbl" xml:lang="en-US" id="id_10729326_2420934_2_1">Semi-annual payments of interest, Net</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_SemiAnnualPaymentsOfInterestNet" xlink:to="ajg_SemiAnnualPaymentsOfInterestNet_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensation" xlink:label="us-gaap_ShareBasedCompensation"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ShareBasedCompensation_lbl" xml:lang="en-US" id="id_10729326_2039916_1_1">Share-based Compensation</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_ShareBasedCompensation_lbl" xml:lang="en-US" id="id_10729326_2039916_2_1">Stock-based and other noncash compensation expense</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensation" xlink:to="us-gaap_ShareBasedCompensation_lbl"/>
    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_ShareBasedCompensationArrangementByShareBasedPaymentAwardAggregateFairValue" xlink:label="ajg_ShareBasedCompensationArrangementByShareBasedPaymentAwardAggregateFairValue"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_ShareBasedCompensationArrangementByShareBasedPaymentAwardAggregateFairValue_lbl" xml:lang="en-US" id="id_10729326_2310522_3_1">Share Based Compensation Arrangement By Share Based Payment Award Aggregate Fair Value</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_ShareBasedCompensationArrangementByShareBasedPaymentAwardAggregateFairValue_lbl" xml:lang="en-US" id="id_10729326_2310522_1_1">Share Based Compensation Arrangement By Share Based Payment Award Aggregate Fair Value</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_ShareBasedCompensationArrangementByShareBasedPaymentAwardAggregateFairValue_lbl" xml:lang="en-US" id="id_10729326_2310522_2_1">Performance unit awards approved, Fair value</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_ShareBasedCompensationArrangementByShareBasedPaymentAwardAggregateFairValue" xlink:to="ajg_ShareBasedCompensationArrangementByShareBasedPaymentAwardAggregateFairValue_lbl"/>
    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingDate" xlink:label="ajg_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingDate"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingDate_lbl" xml:lang="en-US" id="id_10729326_2376855_3_1">Share Based Compensation Arrangement By Share Based Payment Award Award Vesting Date</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingDate_lbl" xml:lang="en-US" id="id_10729326_2376855_1_1">Share Based Compensation Arrangement By Share Based Payment Award Award Vesting Date</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingDate_lbl" xml:lang="en-US" id="id_10729326_2376855_2_1">Share based payment award vesting date</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingDate" xlink:to="ajg_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingDate_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_lbl" xml:lang="en-US" id="id_10729326_2036265_1_1">Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_lbl" xml:lang="en-US" id="id_10729326_2036265_2_1">Vesting period, years</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_lbl"/>
    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionNonvestedIntrinsicValue" xlink:label="ajg_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionNonvestedIntrinsicValue"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionNonvestedIntrinsicValue_lbl" xml:lang="en-US" id="id_10729326_2258148_3_1">Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Option Nonvested Intrinsic Value</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionNonvestedIntrinsicValue_lbl" xml:lang="en-US" id="id_10729326_2258148_1_1">Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Option Nonvested Intrinsic Value</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionNonvestedIntrinsicValue_lbl" xml:lang="en-US" id="id_10729326_2258148_2_1">Total intrinsic value</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionNonvestedIntrinsicValue" xlink:to="ajg_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionNonvestedIntrinsicValue_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_lbl" xml:lang="en-US" id="id_10729326_2038710_1_1">Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_lbl" xml:lang="en-US" id="id_10729326_2038710_2_1">Maximum number of shares available</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_lbl" xml:lang="en-US" id="id_10729326_2038710_12_1">Shares granted in the period</label>
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    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodFairValue_lbl" xml:lang="en-US" id="id_10729326_2182689_3_1">Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period Fair Value</label>
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    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1"/>
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    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_lbl" xml:lang="en-US" id="id_10729326_2039919_2_1">Expected life (in years)</label>
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    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate"/>
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    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate_lbl" xml:lang="en-US" id="id_10729326_2039121_2_1">Volatility</label>
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    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_lbl" xml:lang="en-US" id="id_10729326_2039734_1_1">Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_lbl" xml:lang="en-US" id="id_10729326_2039734_2_1">Expected risk-free interest rate</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_lbl"/>
    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumAmountPayablePerEmployee" xlink:label="ajg_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumAmountPayablePerEmployee"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumAmountPayablePerEmployee_lbl" xml:lang="en-US" id="id_10729326_2236058_3_1">Share Based Compensation Arrangement By Share Based Payment Award Maximum Amount Payable Per Employee</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumAmountPayablePerEmployee_lbl" xml:lang="en-US" id="id_10729326_2236058_1_1">Share Based Compensation Arrangement By Share Based Payment Award Maximum Amount Payable Per Employee</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumAmountPayablePerEmployee_lbl" xml:lang="en-US" id="id_10729326_2236058_2_1">Maximum amount payable for the shares granted during any fiscal year to any person</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumAmountPayablePerEmployee" xlink:to="ajg_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumAmountPayablePerEmployee_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumNumberOfSharesPerEmployee" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumNumberOfSharesPerEmployee"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumNumberOfSharesPerEmployee_lbl" xml:lang="en-US" id="id_10729326_2035866_1_1">Share-based Compensation Arrangement by Share-based Payment Award, Maximum Number of Shares Per Employee</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumNumberOfSharesPerEmployee_lbl" xml:lang="en-US" id="id_10729326_2035866_2_1">Maximum number of shares granted during any fiscal year to any person</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumNumberOfSharesPerEmployee" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumNumberOfSharesPerEmployee_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_lbl" xml:lang="en-US" id="id_10729326_2039920_1_1">Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_lbl" xml:lang="en-US" id="id_10729326_2039920_2_1">Shares authorized</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_lbl" xml:lang="en-US" id="id_10729326_2037512_1_1">Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_lbl" xml:lang="en-US" id="id_10729326_2037512_2_1">Shares available for grant</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1_lbl" xml:lang="en-US" id="id_10729326_2039921_1_1">Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1_lbl" xml:lang="en-US" id="id_10729326_2039921_2_1">Aggregate Intrinsic Value, Exercisable at end of period</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1" xlink:to="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber_lbl" xml:lang="en-US" id="id_10729326_2035721_1_1">Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber_lbl" xml:lang="en-US" id="id_10729326_2035721_2_1">Shares Under Option, Exercisable at end of period</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice_lbl" xml:lang="en-US" id="id_10729326_2035124_1_1">Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice_lbl" xml:lang="en-US" id="id_10729326_2035124_2_1">Weighted Average Exercise Price, Exercisable at end of period</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1_lbl" xml:lang="en-US" id="id_10729326_2037513_1_1">Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1_lbl" xml:lang="en-US" id="id_10729326_2037513_2_1">Weighted Average Remaining Contractual Term (in years), Exercisable at end of period</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1" xlink:to="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1_lbl"/>
    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisedInPeriodIntrinsicValue" xlink:label="ajg_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisedInPeriodIntrinsicValue"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisedInPeriodIntrinsicValue_lbl" xml:lang="en-US" id="id_10729326_2368354_3_1">Share-based compensation arrangement by share based payment award options exercised in period intrinsic value.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisedInPeriodIntrinsicValue_lbl" xml:lang="en-US" id="id_10729326_2368354_1_1">Share Based Compensation Arrangement By Share Based Payment Award Options Exercised In Period Intrinsic Value</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisedInPeriodIntrinsicValue_lbl" xml:lang="en-US" id="id_10729326_2368354_2_1">Total intrinsic value of options exercised</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisedInPeriodIntrinsicValue" xlink:to="ajg_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisedInPeriodIntrinsicValue_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue_lbl" xml:lang="en-US" id="id_10729326_2039324_1_1">Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue_lbl" xml:lang="en-US" id="id_10729326_2039324_2_1">Total intrinsic value of unvested equity based awards</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod_lbl" xml:lang="en-US" id="id_10729326_2039736_1_1">Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod_lbl" xml:lang="en-US" id="id_10729326_2039736_14_1">Shares Under Option, Forfeited or canceled</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod_lbl"/>
    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodExercisePercentageYearOne" xlink:label="ajg_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodExercisePercentageYearOne"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodExercisePercentageYearOne_lbl" xml:lang="en-US" id="id_10729326_2130880_3_1">Share based compensation arrangement by share based payment award options grants in period exercise percentage year one.</label>
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    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingAggregateIntrinsicValue_lbl" xml:lang="en-US" id="id_10729326_2048171_3_1">Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, aggregate Intrinsic Value</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingAggregateIntrinsicValue_lbl" xml:lang="en-US" id="id_10729326_2048171_1_1">Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Aggregate Intrinsic Value</label>
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    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_lbl" xml:lang="en-US" id="id_10729326_2041150_1_1">Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_lbl" xml:lang="en-US" id="id_10729326_2041150_4_1">Shares Under Option, Ending balance</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_lbl" xml:lang="en-US" id="id_10729326_2041150_5_1">Shares Under Option, Beginning balance</label>
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    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_lbl"/>
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    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingValue_lbl" xml:lang="en-US" id="id_10729326_2201919_3_1">Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Value</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingValue_lbl" xml:lang="en-US" id="id_10729326_2201919_1_1">Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Value</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingValue_lbl" xml:lang="en-US" id="id_10729326_2201919_2_1">Share-based compensation, shares outstanding, Value</label>
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    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_lbl" xml:lang="en-US" id="id_10729326_2035540_1_1">Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price</label>
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    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2_lbl" xml:lang="en-US" id="id_10729326_2036768_1_1">Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term</label>
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    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2" xlink:to="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2_lbl"/>
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    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber_lbl" xml:lang="en-US" id="id_10729326_2040313_1_1">Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number</label>
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    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeDomain_lbl" xml:lang="en-US" id="id_10729326_2037350_2_1">Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Domain]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeDomain" xlink:to="us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeDomain_lbl"/>
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    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1_lbl" xml:lang="en-US" id="id_10729326_2035541_1_1">Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Exercisable Options, Weighted Average Exercise Price</label>
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    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLineItems_lbl" xml:lang="en-US" id="id_10729326_2039741_2_1">Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]</label>
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    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit" xlink:to="us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit_lbl"/>
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    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions_lbl" xml:lang="en-US" id="id_10729326_2038100_1_1">Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Number of Exercisable Options</label>
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    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StatementOfCashFlowsAbstract" xlink:to="us-gaap_StatementOfCashFlowsAbstract_lbl"/>
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    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StatementOfFinancialPositionAbstract" xlink:to="us-gaap_StatementOfFinancialPositionAbstract_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_StatementOfIncomeAndComprehensiveIncomeAbstract" xlink:label="us-gaap_StatementOfIncomeAndComprehensiveIncomeAbstract"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_StatementOfIncomeAndComprehensiveIncomeAbstract_lbl" xml:lang="en-US" id="id_10729326_2035883_1_1">Statement of Comprehensive Income [Abstract]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_StatementOfIncomeAndComprehensiveIncomeAbstract_lbl" xml:lang="en-US" id="id_10729326_2035883_2_1">Statement of Comprehensive Income [Abstract]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StatementOfIncomeAndComprehensiveIncomeAbstract" xlink:to="us-gaap_StatementOfIncomeAndComprehensiveIncomeAbstract_lbl"/>
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    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_StatementOfStockholdersEquityAbstract_lbl" xml:lang="en-US" id="id_10729326_2040324_1_1">Statement of Stockholders' Equity [Abstract]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_StatementOfStockholdersEquityAbstract_lbl" xml:lang="en-US" id="id_10729326_2040324_2_1">Statement of Stockholders' Equity [Abstract]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StatementOfStockholdersEquityAbstract" xlink:to="us-gaap_StatementOfStockholdersEquityAbstract_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_StatementScenarioAxis" xlink:label="us-gaap_StatementScenarioAxis"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_StatementScenarioAxis_lbl" xml:lang="en-US" id="id_10729326_2039338_1_1">Scenario [Axis]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_StatementScenarioAxis_lbl" xml:lang="en-US" id="id_10729326_2039338_2_1">Scenario [Axis]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StatementScenarioAxis" xlink:to="us-gaap_StatementScenarioAxis_lbl"/>
    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_StatementsOfCashFlowsPolicyPolicyTextBlock" xlink:label="ajg_StatementsOfCashFlowsPolicyPolicyTextBlock"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_StatementsOfCashFlowsPolicyPolicyTextBlock_lbl" xml:lang="en-US" id="id_10729326_2058255_3_1">Statements of cash flows.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_StatementsOfCashFlowsPolicyPolicyTextBlock_lbl" xml:lang="en-US" id="id_10729326_2058255_1_1">Statements Of Cash Flows Policy [Policy Text Block]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_StatementsOfCashFlowsPolicyPolicyTextBlock_lbl" xml:lang="en-US" id="id_10729326_2058255_2_1">Cash Receipts and Cash Payments</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_StatementsOfCashFlowsPolicyPolicyTextBlock" xlink:to="ajg_StatementsOfCashFlowsPolicyPolicyTextBlock_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_StatementTable" xlink:label="us-gaap_StatementTable"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_StatementTable_lbl" xml:lang="en-US" id="id_10729326_2038726_1_1">Statement [Table]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_StatementTable_lbl" xml:lang="en-US" id="id_10729326_2038726_2_1">Statement [Table]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StatementTable" xlink:to="us-gaap_StatementTable_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_StockGrantedDuringPeriodValueSharebasedCompensation" xlink:label="us-gaap_StockGrantedDuringPeriodValueSharebasedCompensation"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_StockGrantedDuringPeriodValueSharebasedCompensation_lbl" xml:lang="en-US" id="id_10729326_2037359_1_1">Stock Granted, Value, Share-based Compensation, Net of Forfeitures</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_StockGrantedDuringPeriodValueSharebasedCompensation_lbl" xml:lang="en-US" id="id_10729326_2037359_2_1">Compensation expense related to stock option grants</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_StockGrantedDuringPeriodValueSharebasedCompensation_lbl" xml:lang="en-US" id="id_10729326_2037359_12_1">Compensation expense related to stock option plan grants</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StockGrantedDuringPeriodValueSharebasedCompensation" xlink:to="us-gaap_StockGrantedDuringPeriodValueSharebasedCompensation_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_StockholdersEquity" xlink:label="us-gaap_StockholdersEquity"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_StockholdersEquity_lbl" xml:lang="en-US" id="id_10729326_2035141_1_1">Stockholders' Equity Attributable to Parent</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_StockholdersEquity_lbl" xml:lang="en-US" id="id_10729326_2035141_6_1">Stockholders' equity attributable to controlling interests</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StockholdersEquity" xlink:to="us-gaap_StockholdersEquity_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_StockholdersEquityAbstract" xlink:label="us-gaap_StockholdersEquityAbstract"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_StockholdersEquityAbstract_lbl" xml:lang="en-US" id="id_10729326_2035553_1_1">Stockholders' Equity Attributable to Parent [Abstract]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_StockholdersEquityAbstract_lbl" xml:lang="en-US" id="id_10729326_2035553_2_1">Stockholders' equity:</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StockholdersEquityAbstract" xlink:to="us-gaap_StockholdersEquityAbstract_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest" xlink:label="us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_lbl" xml:lang="en-US" id="id_10729326_2036787_1_1">Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:label="us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_lbl" xml:lang="en-US" id="id_10729326_2036787_4_1">Ending Balance</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:label="us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_lbl" xml:lang="en-US" id="id_10729326_2036787_5_1">Beginning Balance</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_lbl" xml:lang="en-US" id="id_10729326_2036787_6_1">Total stockholders' equity</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest" xlink:to="us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharebasedCompensationAbstract" xlink:label="us-gaap_StockIssuedDuringPeriodSharebasedCompensationAbstract"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_StockIssuedDuringPeriodSharebasedCompensationAbstract_lbl" xml:lang="en-US" id="id_10729326_2040764_1_1">Stock Issued or Granted During Period, Share-based Compensation [Abstract]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_StockIssuedDuringPeriodSharebasedCompensationAbstract_lbl" xml:lang="en-US" id="id_10729326_2040764_2_1">Common stock issued in:</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StockIssuedDuringPeriodSharebasedCompensationAbstract" xlink:to="us-gaap_StockIssuedDuringPeriodSharebasedCompensationAbstract_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesAcquisitions" xlink:label="us-gaap_StockIssuedDuringPeriodSharesAcquisitions"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_StockIssuedDuringPeriodSharesAcquisitions_lbl" xml:lang="en-US" id="id_10729326_2039343_1_1">Stock Issued During Period, Shares, Acquisitions</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_StockIssuedDuringPeriodSharesAcquisitions_lbl" xml:lang="en-US" id="id_10729326_2039343_2_1">Two purchase transactions (in shares)</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StockIssuedDuringPeriodSharesAcquisitions" xlink:to="us-gaap_StockIssuedDuringPeriodSharesAcquisitions_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans" xlink:label="us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans_lbl" xml:lang="en-US" id="id_10729326_2038886_1_1">Stock Issued During Period, Shares, Employee Stock Purchase Plans</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans_lbl" xml:lang="en-US" id="id_10729326_2038886_2_1">Employee stock purchase plan (in shares)</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans" xlink:to="us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised" xlink:label="us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_lbl" xml:lang="en-US" id="id_10729326_2035145_1_1">Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_lbl" xml:lang="en-US" id="id_10729326_2035145_2_1">Stock option plans (in shares)</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_lbl" xml:lang="en-US" id="id_10729326_2035145_14_1">Shares Under Option, Exercised</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised" xlink:to="us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_StockIssuedDuringPeriodValueAcquisitions" xlink:label="us-gaap_StockIssuedDuringPeriodValueAcquisitions"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_StockIssuedDuringPeriodValueAcquisitions_lbl" xml:lang="en-US" id="id_10729326_2040132_1_1">Stock Issued During Period, Value, Acquisitions</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_StockIssuedDuringPeriodValueAcquisitions_lbl" xml:lang="en-US" id="id_10729326_2040132_2_1">Two purchase transactions</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StockIssuedDuringPeriodValueAcquisitions" xlink:to="us-gaap_StockIssuedDuringPeriodValueAcquisitions_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan" xlink:label="us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan_lbl" xml:lang="en-US" id="id_10729326_2039347_1_1">Stock Issued During Period, Value, Employee Stock Purchase Plan</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan_lbl" xml:lang="en-US" id="id_10729326_2039347_2_1">Employee stock purchase plan</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan" xlink:to="us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross" xlink:label="us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross_lbl" xml:lang="en-US" id="id_10729326_2039553_1_1">Stock Issued During Period, Value, Restricted Stock Award, Gross</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross_lbl" xml:lang="en-US" id="id_10729326_2039553_2_1">Equity awards with an aggregate fair value</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross" xlink:to="us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised" xlink:label="us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised_lbl" xml:lang="en-US" id="id_10729326_2038502_1_1">Stock Issued During Period, Value, Stock Options Exercised</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised_lbl" xml:lang="en-US" id="id_10729326_2038502_2_1">Stock option plans</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised" xlink:to="us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised_lbl"/>
    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_StockOptionPlansLineItems" xlink:label="ajg_StockOptionPlansLineItems"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_StockOptionPlansLineItems_lbl" xml:lang="en-US" id="id_10729326_2349574_3_1">Stock Option Plans [Line Items]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_StockOptionPlansLineItems_lbl" xml:lang="en-US" id="id_10729326_2349574_1_1">Stock Option Plans [Line Items]</label>
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    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_StockOptionPlansLineItems" xlink:to="ajg_StockOptionPlansLineItems_lbl"/>
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    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_TaxImpactFromIssuanceOfCommonStock_lbl" xml:lang="en-US" id="id_10729326_2048673_3_1">Tax Impact from Issuance of Common Stock</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_TaxImpactFromIssuanceOfCommonStock_lbl" xml:lang="en-US" id="id_10729326_2048673_1_1">Tax Impact From Issuance Of Common Stock</label>
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    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_TaxIncrementFinancingMember_lbl" xml:lang="en-US" id="id_10729326_2192614_3_1">Tax Increment Financing [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_TaxIncrementFinancingMember_lbl" xml:lang="en-US" id="id_10729326_2192614_1_1">Tax Increment Financing [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_TaxIncrementFinancingMember_lbl" xml:lang="en-US" id="id_10729326_2192614_2_1">Tax Increment Financing [Member]</label>
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    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_TextBlockAbstract_lbl" xml:lang="en-US" id="id_10729326_2033750_1_1">Text Block [Abstract]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_TextBlockAbstract_lbl" xml:lang="en-US" id="id_10729326_2033750_2_1">Text Block [Abstract]</label>
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    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_lbl" xml:lang="en-US" id="id_10729326_2037020_2_1">Financial Instruments [Domain]</label>
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    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_TwoThousandFifteenProvisionalCashAwardsMember" xlink:label="ajg_TwoThousandFifteenProvisionalCashAwardsMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_TwoThousandFifteenProvisionalCashAwardsMember_lbl" xml:lang="en-US" id="id_10729326_2326426_3_1">Two Thousand Fifteen Provisional Cash Awards [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_TwoThousandFifteenProvisionalCashAwardsMember_lbl" xml:lang="en-US" id="id_10729326_2326426_1_1">Two Thousand Fifteen Provisional Cash Awards [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_TwoThousandFifteenProvisionalCashAwardsMember_lbl" xml:lang="en-US" id="id_10729326_2326426_2_1">2015 Provisional Cash Awards [Member]</label>
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    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_TwoThousandFourteenProvisionalCashAwardsMember" xlink:label="ajg_TwoThousandFourteenProvisionalCashAwardsMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_TwoThousandFourteenProvisionalCashAwardsMember_lbl" xml:lang="en-US" id="id_10729326_2089358_3_1">Two thousand fourteen provisional cash awards.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_TwoThousandFourteenProvisionalCashAwardsMember_lbl" xml:lang="en-US" id="id_10729326_2089358_1_1">Two Thousand Fourteen Provisional Cash Awards [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_TwoThousandFourteenProvisionalCashAwardsMember_lbl" xml:lang="en-US" id="id_10729326_2089358_2_1">2014 Provisional Cash Awards [Member]</label>
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    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_TwoThousandSeventeenAcquisitionsMember" xlink:label="ajg_TwoThousandSeventeenAcquisitionsMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_TwoThousandSeventeenAcquisitionsMember_lbl" xml:lang="en-US" id="id_10729326_2428725_3_1">Two thousand seventeen acquisitions.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_TwoThousandSeventeenAcquisitionsMember_lbl" xml:lang="en-US" id="id_10729326_2428725_1_1">Two Thousand Seventeen Acquisitions [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_TwoThousandSeventeenAcquisitionsMember_lbl" xml:lang="en-US" id="id_10729326_2428725_2_1">2017 Acquisitions [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_TwoThousandSeventeenAcquisitionsMember" xlink:to="ajg_TwoThousandSeventeenAcquisitionsMember_lbl"/>
    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_TwoThousandSeventeenProvisionalCashAwardsMember" xlink:label="ajg_TwoThousandSeventeenProvisionalCashAwardsMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_TwoThousandSeventeenProvisionalCashAwardsMember_lbl" xml:lang="en-US" id="id_10729326_2428902_3_1">Two Thousand Seventeen Provisional Cash Awards [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_TwoThousandSeventeenProvisionalCashAwardsMember_lbl" xml:lang="en-US" id="id_10729326_2428902_1_1">Two Thousand Seventeen Provisional Cash Awards [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_TwoThousandSeventeenProvisionalCashAwardsMember_lbl" xml:lang="en-US" id="id_10729326_2428902_2_1">2017 Provisional Cash Awards [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_TwoThousandSeventeenProvisionalCashAwardsMember" xlink:to="ajg_TwoThousandSeventeenProvisionalCashAwardsMember_lbl"/>
    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_TwoThousandSixteenAcquisitionsMember" xlink:label="ajg_TwoThousandSixteenAcquisitionsMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_TwoThousandSixteenAcquisitionsMember_lbl" xml:lang="en-US" id="id_10729326_2386183_3_1">Two Thousand Sixteen Acquisitions [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_TwoThousandSixteenAcquisitionsMember_lbl" xml:lang="en-US" id="id_10729326_2386183_1_1">Two Thousand Sixteen Acquisitions [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_TwoThousandSixteenAcquisitionsMember_lbl" xml:lang="en-US" id="id_10729326_2386183_2_1">2016 Acquisitions [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_TwoThousandSixteenAcquisitionsMember" xlink:to="ajg_TwoThousandSixteenAcquisitionsMember_lbl"/>
    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_TwoThousandSixteenProvisionalCashAwardsMember" xlink:label="ajg_TwoThousandSixteenProvisionalCashAwardsMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_TwoThousandSixteenProvisionalCashAwardsMember_lbl" xml:lang="en-US" id="id_10729326_2391741_3_1">Two Thousand Sixteen Provisional Cash Awards [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_TwoThousandSixteenProvisionalCashAwardsMember_lbl" xml:lang="en-US" id="id_10729326_2391741_1_1">Two Thousand Sixteen Provisional Cash Awards [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_TwoThousandSixteenProvisionalCashAwardsMember_lbl" xml:lang="en-US" id="id_10729326_2391741_2_1">2016 Provisional Cash Awards [Member]</label>
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    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_TwoThousandThirteenProvisionalCashAwardsMember" xlink:label="ajg_TwoThousandThirteenProvisionalCashAwardsMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_TwoThousandThirteenProvisionalCashAwardsMember_lbl" xml:lang="en-US" id="id_10729326_2200139_3_1">Two Thousand Thirteen Provisional Cash Awards [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_TwoThousandThirteenProvisionalCashAwardsMember_lbl" xml:lang="en-US" id="id_10729326_2200139_1_1">Two Thousand Thirteen Provisional Cash Awards [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_TwoThousandThirteenProvisionalCashAwardsMember_lbl" xml:lang="en-US" id="id_10729326_2200139_2_1">2013 Provisional Cash Awards [Member]</label>
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    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_TypeOfAdoptionMember" xlink:label="us-gaap_TypeOfAdoptionMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_TypeOfAdoptionMember_lbl" xml:lang="en-US" id="id_10729326_2037381_1_1">Type of Adoption [Domain]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_TypeOfAdoptionMember_lbl" xml:lang="en-US" id="id_10729326_2037381_2_1">Type of Adoption [Domain]</label>
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    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_UltimateAwardValueMultiplesOfOriginalValueOfUnitsMaximum" xlink:label="ajg_UltimateAwardValueMultiplesOfOriginalValueOfUnitsMaximum"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_UltimateAwardValueMultiplesOfOriginalValueOfUnitsMaximum_lbl" xml:lang="en-US" id="id_10729326_2183122_3_1">Ultimate Award Value Multiples of Original Value of Units, Maximum</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_UltimateAwardValueMultiplesOfOriginalValueOfUnitsMaximum_lbl" xml:lang="en-US" id="id_10729326_2183122_1_1">Ultimate Award Value Multiples Of Original Value Of Units Maximum</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_UltimateAwardValueMultiplesOfOriginalValueOfUnitsMaximum_lbl" xml:lang="en-US" id="id_10729326_2183122_2_1">Ultimate award value, multiples of original value of the units, maximum</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_UltimateAwardValueMultiplesOfOriginalValueOfUnitsMaximum" xlink:to="ajg_UltimateAwardValueMultiplesOfOriginalValueOfUnitsMaximum_lbl"/>
    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_UltimateAwardValueMultiplesOfOriginalValueOfUnitsMinimum" xlink:label="ajg_UltimateAwardValueMultiplesOfOriginalValueOfUnitsMinimum"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_UltimateAwardValueMultiplesOfOriginalValueOfUnitsMinimum_lbl" xml:lang="en-US" id="id_10729326_2268791_3_1">Ultimate Award Value Multiples of Original Value of Units, Minimum</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_UltimateAwardValueMultiplesOfOriginalValueOfUnitsMinimum_lbl" xml:lang="en-US" id="id_10729326_2268791_1_1">Ultimate Award Value Multiples Of Original Value Of Units Minimum</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_UltimateAwardValueMultiplesOfOriginalValueOfUnitsMinimum_lbl" xml:lang="en-US" id="id_10729326_2268791_2_1">Ultimate award value, multiples of original value of the units, minimum</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_UltimateAwardValueMultiplesOfOriginalValueOfUnitsMinimum" xlink:to="ajg_UltimateAwardValueMultiplesOfOriginalValueOfUnitsMinimum_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_UnamortizedDebtIssuanceExpense" xlink:label="us-gaap_UnamortizedDebtIssuanceExpense"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_UnamortizedDebtIssuanceExpense_lbl" xml:lang="en-US" id="id_10729326_2039964_1_1">Unamortized Debt Issuance Expense</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="us-gaap_UnamortizedDebtIssuanceExpense_lbl" xml:lang="en-US" id="id_10729326_2039964_14_1">Less unamortized debt acquisition costs on Note Purchase Agreements</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_UnamortizedDebtIssuanceExpense" xlink:to="us-gaap_UnamortizedDebtIssuanceExpense_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_UnconditionalPurchaseObligationCategoryOfGoodsOrServicesAcquiredDomain" xlink:label="us-gaap_UnconditionalPurchaseObligationCategoryOfGoodsOrServicesAcquiredDomain"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_UnconditionalPurchaseObligationCategoryOfGoodsOrServicesAcquiredDomain_lbl" xml:lang="en-US" id="id_10729326_2037981_1_1">Unconditional Purchase Obligation, Category of Goods or Services Acquired [Domain]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_UnconditionalPurchaseObligationCategoryOfGoodsOrServicesAcquiredDomain_lbl" xml:lang="en-US" id="id_10729326_2037981_2_1">Unconditional Purchase Obligation, Category of Goods or Services Acquired [Domain]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_UnconditionalPurchaseObligationCategoryOfGoodsOrServicesAcquiredDomain" xlink:to="us-gaap_UnconditionalPurchaseObligationCategoryOfGoodsOrServicesAcquiredDomain_lbl"/>
    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_UnearnedDeferredCompensationShare" xlink:label="ajg_UnearnedDeferredCompensationShare"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_UnearnedDeferredCompensationShare_lbl" xml:lang="en-US" id="id_10729326_2304040_3_1">Unearned Deferred Compensation, Shares</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_UnearnedDeferredCompensationShare_lbl" xml:lang="en-US" id="id_10729326_2304040_1_1">Unearned Deferred Compensation Share</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_UnearnedDeferredCompensationShare_lbl" xml:lang="en-US" id="id_10729326_2304040_2_1">Unearned deferred compensation, shares</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_UnearnedDeferredCompensationShare" xlink:to="ajg_UnearnedDeferredCompensationShare_lbl"/>
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    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_UnearnedDeferredCompensationValue_lbl" xml:lang="en-US" id="id_10729326_2086516_1_1">Unearned Deferred Compensation Value</label>
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    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_UnearnedFees" xlink:label="ajg_UnearnedFees"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_UnearnedFees_lbl" xml:lang="en-US" id="id_10729326_2309351_3_1">Unearned fees</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_UnearnedFees_lbl" xml:lang="en-US" id="id_10729326_2309351_1_1">Unearned Fees</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_UnearnedFees_lbl" xml:lang="en-US" id="id_10729326_2309351_2_1">Unearned fees</label>
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    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_UnearnedRestrictedStockMember" xlink:label="ajg_UnearnedRestrictedStockMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_UnearnedRestrictedStockMember_lbl" xml:lang="en-US" id="id_10729326_2114174_3_1">Unearned restricted stock member.</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_UnearnedRestrictedStockMember_lbl" xml:lang="en-US" id="id_10729326_2114174_1_1">Unearned Restricted Stock [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_UnearnedRestrictedStockMember_lbl" xml:lang="en-US" id="id_10729326_2114174_2_1">Unvested Restricted Stock [Member]</label>
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    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_UnsecuredMulticurrencyCreditAgreementMember" xlink:label="ajg_UnsecuredMulticurrencyCreditAgreementMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_UnsecuredMulticurrencyCreditAgreementMember_lbl" xml:lang="en-US" id="id_10729326_2132156_3_1">Unsecured Multicurrency Credit Agreement [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_UnsecuredMulticurrencyCreditAgreementMember_lbl" xml:lang="en-US" id="id_10729326_2132156_1_1">Unsecured Multicurrency Credit Agreement [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_UnsecuredMulticurrencyCreditAgreementMember_lbl" xml:lang="en-US" id="id_10729326_2132156_2_1">Multi Currency Credit Agreement [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ajg_UnsecuredMulticurrencyCreditAgreementMember" xlink:to="ajg_UnsecuredMulticurrencyCreditAgreementMember_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/country/2016/country-2016-01-31.xsd#country_US" xlink:label="country_US"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="country_US_lbl" xml:lang="en-US" id="id_10729326_2037985_1_1">UNITED STATES</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="country_US_lbl" xml:lang="en-US" id="id_10729326_2037985_2_1">Unites States [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="country_US" xlink:to="country_US_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ValuationTechniqueAxis" xlink:label="us-gaap_ValuationTechniqueAxis"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ValuationTechniqueAxis_lbl" xml:lang="en-US" id="id_10729326_2038534_1_1">Valuation Technique [Axis]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_ValuationTechniqueAxis_lbl" xml:lang="en-US" id="id_10729326_2038534_2_1">Valuation Technique [Axis]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ValuationTechniqueAxis" xlink:to="us-gaap_ValuationTechniqueAxis_lbl"/>
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ValuationTechniqueDomain" xlink:label="us-gaap_ValuationTechniqueDomain"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ValuationTechniqueDomain_lbl" xml:lang="en-US" id="id_10729326_2040362_1_1">Valuation Technique [Domain]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_ValuationTechniqueDomain_lbl" xml:lang="en-US" id="id_10729326_2040362_2_1">Valuation Technique [Domain]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ValuationTechniqueDomain" xlink:to="us-gaap_ValuationTechniqueDomain_lbl"/>
    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_VentureCapitalFundsAndOtherMember" xlink:label="ajg_VentureCapitalFundsAndOtherMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_VentureCapitalFundsAndOtherMember_lbl" xml:lang="en-US" id="id_10729326_2097301_3_1">Venture Capital Funds and Other [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_VentureCapitalFundsAndOtherMember_lbl" xml:lang="en-US" id="id_10729326_2097301_1_1">Venture Capital Funds And Other [Member]</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_VentureCapitalFundsAndOtherMember_lbl" xml:lang="en-US" id="id_10729326_2097301_2_1">Other Investments [Member]</label>
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    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_WeightedAverageNumberOfCommonAndCommonEquivalentSharesOutstanding" xlink:label="ajg_WeightedAverageNumberOfCommonAndCommonEquivalentSharesOutstanding"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_WeightedAverageNumberOfCommonAndCommonEquivalentSharesOutstanding_lbl" xml:lang="en-US" id="id_10729326_2333856_3_1">Weighted Average Number Of Common And Common Equivalent Shares Outstanding</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_WeightedAverageNumberOfCommonAndCommonEquivalentSharesOutstanding_lbl" xml:lang="en-US" id="id_10729326_2333856_1_1">Weighted Average Number Of Common And Common Equivalent Shares Outstanding</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="ajg_WeightedAverageNumberOfCommonAndCommonEquivalentSharesOutstanding_lbl" xml:lang="en-US" id="id_10729326_2333856_6_1">Weighted average number of common and common equivalent shares outstanding</label>
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    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingBasic" xlink:label="us-gaap_WeightedAverageNumberOfSharesOutstandingBasic"/>
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    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_lbl" xml:lang="en-US" id="id_10729326_2038354_2_1">Weighted average number of common shares outstanding</label>
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    <loc xlink:type="locator" xlink:href="ajg-20170331.xsd#ajg_WeightedAveragePeriod" xlink:label="ajg_WeightedAveragePeriod"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ajg_WeightedAveragePeriod_lbl" xml:lang="en-US" id="id_10729326_2168040_3_1">Weighted Average Period</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ajg_WeightedAveragePeriod_lbl" xml:lang="en-US" id="id_10729326_2168040_1_1">Weighted Average Period</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ajg_WeightedAveragePeriod_lbl" xml:lang="en-US" id="id_10729326_2168040_2_1">Weighted average period, years</label>
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