$AJG
Arthur J. Gallagher & Co. Stock $ajg

$ajg Overview Financials Valuation SEC Filings Company Website

2013 Q2 Form 10-K Financial Statement

#000119312514040834 Filed on February 07, 2014

Income Statement

Concept	2013 Q2	2013	2012 Q4
Revenue	$779.5M	$3.180B	$673.2M
YoY Change	19.94%	26.16%	16.39%
Cost Of Revenue	$76.60M	$437.3M	$448.2M
YoY Change	164.14%	291.85%	17.76%
Gross Profit	$702.9M	$2.742B	$225.0M
YoY Change	13.21%	13.85%	13.75%
Gross Profit Margin	90.17%	86.25%	33.42%
Selling, General & Admin
YoY Change
% of Gross Profit
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$13.10M	$53.40M	$36.70M
YoY Change	28.43%	28.99%	8.26%
% of Gross Profit	1.86%	1.95%	16.31%
Operating Expenses	$137.8M	$535.9M	$168.7M
YoY Change	11.4%	10.91%	20.5%
Operating Profit	$565.1M	$2.206B	$56.30M
YoY Change	13.66%	14.59%	-2.6%
Interest Expense	$11.90M	$50.10M	-$10.90M
YoY Change	10.19%	16.51%	4.81%
% of Operating Profit	2.11%	2.27%	-19.36%
Other Income/Expense, Net
YoY Change
Pretax Income	$97.40M	$291.0M	$45.40M
YoY Change	6.92%	18.63%	-4.22%
Income Tax	$3.900M	$6.400M	$11.90M
% Of Pretax Income	4.0%	2.2%	26.21%
Net Earnings	$93.50M	$268.6M	$33.50M
YoY Change	30.4%	37.74%	-17.28%
Net Earnings / Revenue	11.99%	8.45%	4.98%
Basic Earnings Per Share	$0.73	$2.08	$0.27
Diluted Earnings Per Share	$0.73	$2.06	$0.27
COMMON SHARES
Basic Shares Outstanding	127.3M shares	128.9M shares
Diluted Shares Outstanding

Balance Sheet

Concept	2013 Q2	2013	2012 Q4
SHORT-TERM ASSETS
Cash & Short-Term Investments	$240.0M	$298.0M	$302.0M
YoY Change	-14.89%	-1.32%	3.78%
Cash & Equivalents	$240.0M	$298.0M	$302.1M
Short-Term Investments
Other Short-Term Assets	$203.9M	$1.289B	$179.7M
YoY Change	29.13%	25.02%	-4.72%
Inventory
Prepaid Expenses
Receivables		$1.289B
Other Receivables		$0.00
Total Short-Term Assets	$2.603B	$2.876B	$2.430B
YoY Change	-1.11%	18.35%	10.46%
LONG-TERM ASSETS
Property, Plant & Equipment	$123.0M	$160.0M	$105.4M
YoY Change	21.9%	52.38%	15.44%
Goodwill	$1.506B		$1.473B
YoY Change	17.12%		27.47%
Intangibles	$784.7M		$809.6M
YoY Change	21.68%		44.19%
Long-Term Investments
YoY Change
Other Assets	$270.6M	$601.0M	$283.3M
YoY Change	16.44%	12.34%	20.14%
Total Long-Term Assets	$2.960B	$3.985B	$2.923B
YoY Change	18.29%	36.38%	27.96%
TOTAL ASSETS
Total Short-Term Assets	$2.603B	$2.876B	$2.430B
Total Long-Term Assets	$2.960B	$3.985B	$2.923B
Total Assets	$5.562B	$6.861B	$5.352B
YoY Change	8.35%	28.2%	19.38%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$1.948B	$2.155B	$1.820B
YoY Change	-4.42%	18.41%	12.21%
Accrued Expenses	$284.0M	$371.0M	$307.0M
YoY Change	16.39%	20.85%	0.99%
Deferred Revenue
YoY Change
Short-Term Debt	$0.00	$0.00	$129.0M
YoY Change	-100.0%		1190.0%
Long-Term Debt Due	$0.00	$631.0M	$129.0M
YoY Change	-100.0%	389.15%	1190.0%
Total Short-Term Liabilities	$2.344B	$3.285B	$2.363B
YoY Change	-4.03%	39.02%	13.95%
LONG-TERM LIABILITIES
Long-Term Debt	$925.0M	$825.0M	$725.0M
YoY Change	37.04%	13.79%	7.41%
Other Long-Term Liabilities	$591.4M	$665.0M	$605.8M
YoY Change	8.77%	9.74%	23.31%
Total Long-Term Liabilities	$1.516B	$1.490B	$1.331B
YoY Change	24.43%	11.95%	14.1%
TOTAL LIABILITIES
Total Short-Term Liabilities	$2.344B	$3.285B	$2.363B
Total Long-Term Liabilities	$1.516B	$1.490B	$1.331B
Total Liabilities	$3.860B	$4.775B	$3.694B
YoY Change	5.45%	29.26%	14.01%
SHAREHOLDERS EQUITY
Retained Earnings	$554.9M		$510.4M
YoY Change	10.82%		5.69%
Common Stock	$1.220B		$1.181B
YoY Change	19.54%		46.18%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$1.702B	$2.086B	$1.659B
YoY Change
Total Liabilities & Shareholders Equity	$5.562B	$6.861B	$5.352B
YoY Change	8.35%	28.2%	19.38%

Cashflow Statement

Concept	2013 Q2	2013	2012 Q4
OPERATING ACTIVITIES
Net Income	$93.50M	$268.6M	$33.50M
YoY Change	30.4%	37.74%	-17.28%
Depreciation, Depletion And Amortization	$13.10M	$53.40M	$36.70M
YoY Change	28.43%	28.99%	8.26%
Cash From Operating Activities	$22.60M	$349.9M	$163.6M
YoY Change	-79.93%	2.01%	66.26%
INVESTING ACTIVITIES
Capital Expenditures	-$26.60M	$93.60M	-$14.90M
YoY Change	95.59%	83.53%	40.57%
Acquisitions		$727.7M
YoY Change		111.48%
Other Investing Activities	-$105.9M	-$758.1M	-$212.9M
YoY Change	87.77%	128.89%	555.08%
Cash From Investing Activities	-$132.5M	-$851.7M	-$227.8M
YoY Change	89.29%	122.84%	428.54%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net		$76.20M
YoY Change		-194.31%
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	129.4M	502.6M	61.00M
YoY Change	-317.48%	994.99%	-1010.45%
NET CHANGE
Cash From Operating Activities	22.60M	349.9M	163.6M
Cash From Investing Activities	-132.5M	-851.7M	-227.8M
Cash From Financing Activities	129.4M	502.6M	61.00M
Net Change In Cash	19.50M	800.0K	-3.200M
YoY Change	-215.38%	-88.06%	-106.58%
FREE CASH FLOW
Cash From Operating Activities	$22.60M	$349.9M	$163.6M
Capital Expenditures	-$26.60M	$93.60M	-$14.90M
Free Cash Flow	$49.20M	$256.3M	$178.5M
YoY Change	-61.01%	-12.23%	63.76%

Facts In Submission

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CY2013Q4	us-gaap	Common Stock Value CommonStockValue	133600000
CY2013Q4	us-gaap	Deferred Rent Credit Current DeferredRentCreditCurrent	-8200000
CY2013Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	6860500000
CY2013Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Year Three DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree	11800000
CY2013Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Next Twelve Months DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths	10100000
CY2013Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	8800000
CY2013Q4	us-gaap	Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Current Liabilities Other BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesOther	3800000
CY2013Q4	us-gaap	Liabilities Current LiabilitiesCurrent	3284800000
CY2013Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-2600000
CY2013Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	9200000
CY2013Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	665200000
CY2013Q4	us-gaap	Stockholders Equity StockholdersEquity	2085500000
CY2013Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	1358100000
CY2013Q4	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued	600000
CY2013Q4	us-gaap	Deferred Tax Liabilities Undistributed Foreign Earnings DeferredTaxLiabilitiesUndistributedForeignEarnings	224200000
CY2013Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Year Two DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo	11000000
CY2013Q4	us-gaap	Defined Benefit Plan Benefit Obligation DefinedBenefitPlanBenefitObligation	272500000
CY2013Q4	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets Intangible Assets DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets	184000000
CY2013Q4	us-gaap	Long Term Debt LongTermDebt	36500000
CY2013Q4	us-gaap	Liabilities Liabilities	4775000000
CY2013Q4	us-gaap	Defined Benefit Plan Accumulated Other Comprehensive Income Net Gains Losses Before Tax DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax	47000000
CY2013Q4	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	44500000
CY2013Q4	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent	17600000
CY2013Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Year Five DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive	13300000
CY2013Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	5900000
CY2013Q4	us-gaap	Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Noncurrent Liabilities BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilities	55100000
CY2013Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Year Four DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour	12600000
CY2013Q4	us-gaap	Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Noncurrent Assets BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentAssets	3600000
CY2013Q4	us-gaap	Finite Lived Trade Names Gross FiniteLivedTradeNamesGross	1800000
CY2013Q4	us-gaap	Assets Current AssetsCurrent	2875600000
CY2013Q4	us-gaap	Goodwill Goodwill	2145200000
CY2013Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Share Based Compensation Cost DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost	14200000
CY2013Q4	us-gaap	Leasehold Improvements Gross LeaseholdImprovementsGross	77900000
CY2013Q4	us-gaap	Defined Benefit Plan Amounts Recognized In Balance Sheet DefinedBenefitPlanAmountsRecognizedInBalanceSheet	29400000
CY2013Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	1078800000
CY2013Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards General Business DeferredTaxAssetsTaxCreditCarryforwardsGeneralBusiness	33500000
CY2013Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	320700000
CY2013Q4	us-gaap	Restricted Cash And Cash Equivalents At Carrying Value RestrictedCashAndCashEquivalentsAtCarryingValue	1027400000
CY2013Q4	us-gaap	Finite Lived Noncompete Agreements Gross FiniteLivedNoncompeteAgreementsGross	7100000
CY2013Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	11900000
CY2013Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Next Twelve Months FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths	146300000
CY2013Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	373500000
CY2013Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards Alternative Minimum Tax DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax	108200000
CY2013Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Five FiniteLivedIntangibleAssetsAmortizationExpenseYearFive	115000000
CY2013Q4	us-gaap	Premiums And Other Receivables Net PremiumsAndOtherReceivablesNet	1288800000
CY2013Q4	us-gaap	Defined Benefit Plan Funded Status Of Plan DefinedBenefitPlanFundedStatusOfPlan	-17600000
CY2013Q4	us-gaap	Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Current Assets Other BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsOther	261400000
CY2013Q4	us-gaap	Deferred Tax Assets Net Noncurrent DeferredTaxAssetsNetNoncurrent	279800000
CY2013Q4	us-gaap	Assets Assets	6860500000
CY2013Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Vested And Expected To Vest Outstanding Aggregate Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue	128300000
CY2013Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	298100000
CY2013Q4	us-gaap	Furniture And Fixtures Gross FurnitureAndFixturesGross	78300000
CY2013Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	155200000
CY2013Q4	us-gaap	Escrow Deposit EscrowDeposit	39800000
CY2013Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Accrued Liabilities DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities	30200000
CY2013Q4	us-gaap	Accounts Receivable Billed For Long Term Contracts Or Programs AccountsReceivableBilledForLongTermContractsOrPrograms	2300000
CY2013Q4	us-gaap	Equity Method Investment Summarized Financial Information Assets EquityMethodInvestmentSummarizedFinancialInformationAssets	90400000
CY2013Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Two FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo	141100000
CY2013Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	364700000
CY2013Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	445800000
CY2013Q4	us-gaap	Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Cash And Equivalents BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents	50300000
CY2013Q4	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Intrinsic Value1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1	72500000
CY2013Q4	us-gaap	Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Net BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet	1036600000
CY2013Q4	us-gaap	Deferred Tax Assets Investments DeferredTaxAssetsInvestments	9000000
CY2013Q4	us-gaap	Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Assets BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets	1393900000
CY2013Q4	us-gaap	Capitalized Computer Software Gross CapitalizedComputerSoftwareGross	147600000
CY2013Q4	us-gaap	Other Assets Current OtherAssetsCurrent	261300000
CY2013Q4	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets	254900000
CY2013Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Three FiniteLivedIntangibleAssetsAmortizationExpenseYearThree	135500000
CY2013Q4	us-gaap	Property Plant And Equipment Other PropertyPlantAndEquipmentOther	8500000
CY2013Q4	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized	20700000
CY2013Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards Other DeferredTaxAssetsTaxCreditCarryforwardsOther	5700000
CY2013Q4	us-gaap	Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Property Plant And Equipment BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment	10500000
CY2013Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Four FiniteLivedIntangibleAssetsAmortizationExpenseYearFour	126300000
CY2013Q4	us-gaap	Machinery And Equipment Gross MachineryAndEquipmentGross	16300000
CY2013Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	6800000
CY2013Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	160400000
CY2013Q4	ajg	Number Of Venture Capital Funds Investment NumberOfVentureCapitalFundsInvestment	5	Venture
CY2013Q4	ajg	Deferred Tax Assets Accrued And Unfunded Compensation And Employee Benefits DeferredTaxAssetsAccruedAndUnfundedCompensationAndEmployeeBenefits	136600000
CY2013Q4	ajg	Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercised Intrinsic Value SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisedIntrinsicValue	32000000
CY2013Q4	ajg	Funding Commitment Two FundingCommitmentTwo	1500000
CY2013Q4	ajg	Deferred Tax Liabilities Depreciable Fixed Assets DeferredTaxLiabilitiesDepreciableFixedAssets	5200000
CY2013Q4	ajg	Expiration Lists ExpirationLists	394200000
CY2013Q4	ajg	Commitment For Additional Investment Under Engineering And Construction Contracts CommitmentForAdditionalInvestmentUnderEngineeringAndConstructionContracts	6000000
CY2013Q4	ajg	Deferred Tax Assets Alternative Minimum Tax And Other Credit Carryforwards DeferredTaxAssetsAlternativeMinimumTaxAndOtherCreditCarryforwards	147400000
CY2013Q4	ajg	Accrued Compensation And Other Accrued Liabilities AccruedCompensationAndOtherAccruedLiabilities	370600000
CY2013Q4	ajg	Percentage Of Equity Interest Held By Related Party In Acquired Entity Prior To Acquisition PercentageOfEquityInterestHeldByRelatedPartyInAcquiredEntityPriorToAcquisition	0.25	pure
CY2013Q4	ajg	Unrecognized Deferred Tax Liability On Undistributed Earnings UnrecognizedDeferredTaxLiabilityOnUndistributedEarnings	35200000
CY2013Q4	ajg	Number Of Real Estate Entities Investment NumberOfRealEstateEntitiesInvestment	2	Investment
CY2013Q4	ajg	Deferred Tax Liabilities Accrued Liabilities DeferredTaxLiabilitiesAccruedLiabilities	2400000
CY2013Q4	ajg	Maximum Potential Earnout Payable MaximumPotentialEarnoutPayable	119200000
CY2013Q4	ajg	Premiums Payable To Insurance And Reinsurance Companies PremiumsPayableToInsuranceAndReinsuranceCompanies	2154700000
CY2013Q4	ajg	Additional Payment As Consideration For Purchase Of Interest In Plants AdditionalPaymentAsConsiderationForPurchaseOfInterestInPlants	5000000
CY2013Q4	ajg	Carrying Value Of Prior Noncontrolling Interest On Acquisition Date CarryingValueOfPriorNoncontrollingInterestOnAcquisitionDate	4800000
CY2013Q4	ajg	Semi Annual Payments Of Interest SemiAnnualPaymentsOfInterest	1455500000
CY2013Q4	ajg	Business Acquisition Cost Of Acquired Entity Purchase Price Net BusinessAcquisitionCostOfAcquiredEntityPurchasePriceNet	1036600000
CY2013Q4	ajg	Gain Loss On Purchase Of Additional Interest Under Equity Method GainLossOnPurchaseOfAdditionalInterestUnderEquityMethod	9600000
CY2013Q4	ajg	Funding Commitment One FundingCommitmentOne	2500000
CY2013Q4	ajg	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Aggregate Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingAggregateIntrinsicValue	129400000
CY2013Q4	ajg	Deferred Tax Liabilities Other Prepaid Items DeferredTaxLiabilitiesOtherPrepaidItems	4700000
CY2013Q4	ajg	Deferred Tax Assets Accrued Pension Liability DeferredTaxAssetsAccruedPensionLiability	9200000
CY2013Q4	ajg	Equity Method Investment Summarized Financial Information Funding Commitments EquityMethodInvestmentSummarizedFinancialInformationFundingCommitments	11400000
CY2013Q4	ajg	Unearned Fees UnearnedFees	84500000
CY2013Q4	ajg	Computer Equipment Gross ComputerEquipmentGross	117200000
CY2013Q4	ajg	Number Of Certified Low Income Housing Developments Investment NumberOfCertifiedLowIncomeHousingDevelopmentsInvestment	12	Investment
CY2013Q4	ajg	Fixed Assets And Other Amortizable Intangible Assets Acquired On Acquisition FixedAssetsAndOtherAmortizableIntangibleAssetsAcquiredOnAcquisition	26300000
CY2013Q4	ajg	Deferred Tax Liabilities Investment Related Partnerships DeferredTaxLiabilitiesInvestmentRelatedPartnerships	13200000
CY2013Q4	ajg	Future Amortization Expense Of Fiscal Year FutureAmortizationExpenseOfFiscalYear	664200000
CY2013Q4	ajg	Real Estate Entities Investment Carrying Value RealEstateEntitiesInvestmentCarryingValue	0
CY2013Q4	ajg	Liabilities Recorded On Self Insurance LiabilitiesRecordedOnSelfInsurance	9000000
CY2013Q4	ajg	Promissory Note Received As Consideration For Purchase Of Interest In Plants PromissoryNoteReceivedAsConsiderationForPurchaseOfInterestInPlants	8000000
CY2013Q4	ajg	Equity Methods Investment Additional Ownership Interest Acquired EquityMethodsInvestmentAdditionalOwnershipInterestAcquired	0.35	pure
CY2013Q4	ajg	Business Acquisitions Purchase Price Allocation Goodwill Amount BusinessAcquisitionsPurchasePriceAllocationGoodwillAmount	665000000
CY2013Q4	ajg	Other Assets Acquired On Acquisition OtherAssetsAcquiredOnAcquisition	5000000
CY2013Q4	ajg	Cash Purchase Price Of Limited Liability Company Llc CashPurchasePriceOfLimitedLiabilityCompanyLLC	2500000
CY2013Q4	ajg	Funding Commitment Three FundingCommitmentThree	1400000
CY2011Q1	ajg	Stock Based Compensation Stock Option Granted By Compensation Committee To Officers And Key Employers Exercisable Rate StockBasedCompensationStockOptionGrantedByCompensationCommitteeToOfficersAndKeyEmployersExercisableRate	0.20	pure
CY2011	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod	224000	shares
CY2011	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate	0.027	pure
CY2011	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.28
CY2011	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	1.32
CY2011	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Volatility Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate	0.268	pure
CY2011	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.350	pure
CY2011	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Forfeitures In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice	29.03
CY2011	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.29
CY2011	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Outstanding Weighted Average Remaining Contractual Term2 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2	P3Y5M1D
CY2011	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod	900000	shares
CY2011	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.307	pure
CY2011	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Fair Value Assumptions Expected Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1	P6Y
CY2011	us-gaap	Effective Income Tax Rate Reconciliation Change In Deferred Tax Assets Valuation Allowance EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance	-0.003	pure
CY2011	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Grants In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice	30.95
CY2011	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	-0.018	pure
CY2011	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	800000	shares
CY2011	us-gaap	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Discount Rate DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate	0.0550	pure
CY2011	us-gaap	Effective Income Tax Rate Reconciliation Foreign Income Tax Rate Differential EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential	0.003	pure
CY2011	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Dividend Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate	0.045	pure
CY2011	us-gaap	Number Of Businesses Acquired NumberOfBusinessesAcquired	22	Entity
CY2011	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	284000000
CY2011	us-gaap	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Expected Long Term Return On Assets DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets	0.0750	pure
CY2011	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice	25.87
CY2011	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits EffectiveIncomeTaxRateReconciliationTaxCredits	-0.064	pure
CY2011	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	111700000	shares
CY2011	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Weighted Average Remaining Contractual Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1	P2Y9M29D
CY2011	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Vested And Expected To Vest Outstanding Weighted Average Remaining Contractual Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageRemainingContractualTerm1	P3Y4M28D
CY2011	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	2600000	shares
CY2011	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.047	pure
CY2011	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod	200000	shares
CY2011	us-gaap	Foreign Currency Transaction Gain Loss Before Tax ForeignCurrencyTransactionGainLossBeforeTax	-200000
CY2011	us-gaap	Revenues Revenues	2134700000
CY2011	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	94700000
CY2011	us-gaap	Gain Loss On Investments GainLossOnInvestments	5500000
CY2011	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	145800000
CY2011	us-gaap	Gain Loss On Sale Of Equity Investments GainLossOnSaleOfEquityInvestments	5500000
CY2011	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	264800000
CY2011	us-gaap	Increase Decrease In Premiums Receivable IncreaseDecreaseInPremiumsReceivable	-52100000
CY2011	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	13100000
CY2011	us-gaap	Repayments Of Lines Of Credit RepaymentsOfLinesOfCredit	141000000
CY2011	us-gaap	Increase Decrease In Deferred Income Taxes IncreaseDecreaseInDeferredIncomeTaxes	-21500000
CY2011	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	194700000
CY2011	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Net Unamortized Gain Loss Arising During Period Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax	-53800000
CY2011	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	66700000
CY2011	us-gaap	Income Taxes Paid IncomeTaxesPaid	32000000
CY2011	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	8100000
CY2011	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	-2700000
CY2011	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Before Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditBeforeTax	1600000
CY2011	us-gaap	Business Acquisitions Pro Forma Net Income Loss BusinessAcquisitionsProFormaNetIncomeLoss	14500000
CY2011	us-gaap	Stock Issued During Period Value Acquisitions StockIssuedDuringPeriodValueAcquisitions	102300000
CY2011	us-gaap	Other Sales Revenue Net OtherSalesRevenueNet	200000
CY2011	us-gaap	Income Tax Reconciliation Tax Credits IncomeTaxReconciliationTaxCredits	13200000
CY2011	us-gaap	Defined Benefit Plan Amortization Of Gains Losses DefinedBenefitPlanAmortizationOfGainsLosses	-1600000
CY2011	us-gaap	Stock Granted During Period Value Sharebased Compensation StockGrantedDuringPeriodValueSharebasedCompensation	7100000
CY2011	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	-144100000
CY2011	us-gaap	Interest Paid InterestPaid	38400000
CY2011	us-gaap	Payments For Proceeds From Investments PaymentsForProceedsFromInvestments	14500000
CY2011	us-gaap	Foreign Currency Transaction Gain Loss Unrealized ForeignCurrencyTransactionGainLossUnrealized	-300000
CY2011	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	207800000
CY2011	us-gaap	Investment Income Net InvestmentIncomeNet	8100000
CY2011	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	24900000
CY2011	us-gaap	Net Income Loss NetIncomeLoss	144100000
CY2011	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	-20400000
CY2011	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Gain Loss Arising During Period Net Of Tax OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax	-16100000
CY2011	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	7200000
CY2011	us-gaap	Brokerage Commissions Revenue BrokerageCommissionsRevenue	870200000
CY2011	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	1200000
CY2011	us-gaap	Defined Benefit Plan Expected Return On Plan Assets DefinedBenefitPlanExpectedReturnOnPlanAssets	14900000
CY2011	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	45900000
CY2011	us-gaap	Increase Decrease In Restricted Cash IncreaseDecreaseInRestrictedCash	-31900000
CY2011	us-gaap	Increase Decrease In Reinsurance Payables IncreaseDecreaseInReinsurancePayables	-55800000
CY2011	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax	1600000
CY2011	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	65600000
CY2011	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Transition Asset Obligation Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetTransitionAssetObligationBeforeTax	51200000
CY2011	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	-700000
CY2011	us-gaap	Impairment Of Intangible Assets Finitelived ImpairmentOfIntangibleAssetsFinitelived	4600000
CY2011	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	115200000
CY2011	us-gaap	State And Local Income Tax Expense Benefit Continuing Operations StateAndLocalIncomeTaxExpenseBenefitContinuingOperations	13100000
CY2011	us-gaap	Defined Benefit Plan Amount To Be Amortized From Accumulated Other Comprehensive Income Loss Next Fiscal Year DefinedBenefitPlanAmountToBeAmortizedFromAccumulatedOtherComprehensiveIncomeLossNextFiscalYear	2300000
CY2011	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesBeforeTax	-400000
CY2011	us-gaap	Business Combination Separately Recognized Transactions Additional Disclosures Acquisition Cost Expensed BusinessCombinationSeparatelyRecognizedTransactionsAdditionalDisclosuresAcquisitionCostExpensed	8300000
CY2011	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	149500000
CY2011	us-gaap	Adjustment For Amortization AdjustmentForAmortization	79300000
CY2011	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax	-1800000
CY2011	us-gaap	Defined Benefit Plan Net Periodic Benefit Cost DefinedBenefitPlanNetPeriodicBenefitCost	-1000000
CY2011	us-gaap	Share Based Compensation ShareBasedCompensation	14300000
CY2011	us-gaap	Stock Repurchased During Period Value StockRepurchasedDuringPeriodValue	1200000
CY2011	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	41400000
CY2011	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	7200000
CY2011	us-gaap	Operating Leases Rent Expense Net OperatingLeasesRentExpenseNet	91.0
CY2011	us-gaap	Interest Expense InterestExpense	40800000
CY2011	us-gaap	Increase Decrease In Accrued Income Taxes Payable IncreaseDecreaseInAccruedIncomeTaxesPayable	-10400000
CY2011	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	9800000
CY2011	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	73900000
CY2011	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Reclassification Adjustment From Aoci Realized Upon Sale Or Liquidation Before Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationReclassificationAdjustmentFromAOCIRealizedUponSaleOrLiquidationBeforeTax	0
CY2011	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	72700000
CY2011	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	38400000
CY2011	us-gaap	Defined Benefit Plan Interest Cost DefinedBenefitPlanInterestCost	11900000
CY2011	us-gaap	Cost Of Revenue CostOfRevenue	32000000
CY2011	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-311200000
CY2011	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	30600000
CY2011	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax	52200000
CY2011	us-gaap	Proceeds From Lines Of Credit ProceedsFromLinesOfCredit	151000000
CY2011	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	5900000
CY2011	us-gaap	Federal Income Tax Expense Benefit Continuing Operations FederalIncomeTaxExpenseBenefitContinuingOperations	46200000
CY2011	us-gaap	Benefits Losses And Expenses BenefitsLossesAndExpenses	1926900000
CY2011	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	125000000
CY2011	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	7400000
CY2011	us-gaap	Depreciation Depreciation	35900000
CY2011	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	4600000
CY2011	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	-3000000
CY2011	us-gaap	Income Tax Reconciliation Foreign Income Tax Rate Differential IncomeTaxReconciliationForeignIncomeTaxRateDifferential	600000
CY2011	us-gaap	Labor And Related Expense LaborAndRelatedExpense	1326100000
CY2011	us-gaap	Defined Benefit Plan Service Cost DefinedBenefitPlanServiceCost	400000
CY2011	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	7800000
CY2011	us-gaap	Defined Benefit Plan Contributions By Employer DefinedBenefitPlanContributionsByEmployer	7200000
CY2011	us-gaap	Foreign Income Tax Expense Benefit Continuing Operations ForeignIncomeTaxExpenseBenefitContinuingOperations	4400000
CY2011	us-gaap	Operating Expenses OperatingExpenses	419000000
CY2011	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-3800000
CY2011	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	63700000
CY2011	us-gaap	Effect Of Exchange Rate On Cash And Cash Equivalents EffectOfExchangeRateOnCashAndCashEquivalents	3000000
CY2011	ajg	Net Proceeds From Sales Of Operations NetProceedsFromSalesOfOperations	14000000
CY2011	ajg	Supplemental Commissions SupplementalCommissions	56000000
CY2011	ajg	Tax Expense From Issuance Of Common Stock TaxExpenseFromIssuanceOfCommonStock	3700000
CY2011	ajg	Effective Income Tax Rate Reconciliation Foreign Dividends And Other Permanent Differences EffectiveIncomeTaxRateReconciliationForeignDividendsAndOtherPermanentDifferences	0.001	pure
CY2011	ajg	Options To Purchase Common Stock Shares Outstanding OptionsToPurchaseCommonStockSharesOutstanding	3800000	shares
CY2011	ajg	Cash And Equity Award With Aggregate Fair Value Vested And Distributed To Participants CashAndEquityAwardWithAggregateFairValueVestedAndDistributedToParticipants	500000
CY2011	ajg	Income Tax Reconciliation Foreign Dividends And Other Permanent Differences IncomeTaxReconciliationForeignDividendsAndOtherPermanentDifferences	200000
CY2011	ajg	Net Change In Fees Receivable Unearned Fees NetChangeInFeesReceivableUnearnedFees	4100000
CY2011	ajg	Contingent Commissions ContingentCommissions	38100000
CY2011	ajg	Tax Impact From Issuance Of Common Stock TaxImpactFromIssuanceOfCommonStock	3700000
CY2011	ajg	Income Tax Reconciliation Changes In Unrecognized Tax Benefits Related To Resolution Of Federal And State Audits Expiration Of Various Statutes Of Limitations And Other Items IncomeTaxReconciliationChangesInUnrecognizedTaxBenefitsRelatedToResolutionOfFederalAndStateAuditsExpirationOfVariousStatutesOfLimitationsAndOtherItems	-1900000
CY2011	ajg	Effective Income Tax Rate Reconciliation Changes In Unrecognized Tax Benefits Related To Resolution Of Federal And State Audits Expiration Of Various Statutes Of Limitations And Other Items EffectiveIncomeTaxRateReconciliationChangesInUnrecognizedTaxBenefitsRelatedToResolutionOfFederalAndStateAuditsExpirationOfVariousStatutesOfLimitationsAndOtherItems	-0.009	pure
CY2011	ajg	Number Of Periods Options Expire NumberOfPeriodsOptionsExpire	P7Y
CY2011	ajg	Deferred Compensation And Restricted Stock DeferredCompensationAndRestrictedStock	5900000
CY2011	ajg	Defined Benefit Plan Minimum Contribution By Employer DefinedBenefitPlanMinimumContributionByEmployer	300000
CY2011	ajg	Amortization Of Deferred Compensation And Restricted Stock AmortizationOfDeferredCompensationAndRestrictedStock	6800000
CY2011	ajg	Revenues From Clean Coal Activities RevenuesFromCleanCoalActivities	29200000
CY2011	ajg	Weighted Average Number Of Common And Common Equivalent Shares Outstanding WeightedAverageNumberOfCommonAndCommonEquivalentSharesOutstanding	112500000	shares
CY2011	ajg	Change In Estimated Acquisition Earnout Payables ChangeInEstimatedAcquisitionEarnoutPayables	-6200000
CY2011	ajg	Net Change In Accrued Compensation And Other Accrued Liabilities NetChangeInAccruedCompensationAndOtherAccruedLiabilities	-12800000
CY2011	ajg	Commissions Commissions	1127400000
CY2013	dei	Trading Symbol TradingSymbol	AJG
CY2013	dei	Entity Registrant Name EntityRegistrantName	GALLAGHER ARTHUR J & CO
CY2013	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2013	dei	Amendment Flag AmendmentFlag	false
CY2013	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2013	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2013
CY2013	dei	Document Type DocumentType	10-K
CY2013	dei	Document Period End Date DocumentPeriodEndDate	2013-12-31
CY2013	dei	Entity Central Index Key EntityCentralIndexKey	0000354190
CY2013	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
CY2013	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2013	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2013	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2013	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod	369975	shares
CY2013	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate	0.012	pure
CY2013	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.06
CY2013	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	1.40
CY2013	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Volatility Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate	0.296	pure
CY2013	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.350	pure
CY2013	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Forfeitures In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice	26.01
CY2013	us-gaap	Basis Of Accounting BasisOfAccounting	<div> <p style="MARGIN-BOTTOM: 0pt; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman; MARGIN-TOP: 12pt"> <b>Basis of Presentation -</b> The accompanying consolidated financial statements include our accounts and all of our majority-owned subsidiaries (50% or greater ownership). Substantially all of our investments in partially owned entities in which our ownership is less than 50% are accounted for using the equity method based on the legal form of our ownership interest and the applicable ownership percentage of the entity. However, in situations where a less than 50%-owned investment has been determined to be a variable interest entity (which we refer to as a VIE) and we are deemed to be the primary beneficiary in accordance with the variable interest model of consolidation, we will consolidate the investment into our consolidated financial statements. For partially owned entities accounted for using the equity method, our share of the net earnings of these entities is included in consolidated net earnings. All material intercompany accounts and transactions have been eliminated in consolidation.</p> <p style="MARGIN-BOTTOM: 0pt; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman; MARGIN-TOP: 12pt"> Certain reclassifications have been made to the amounts reported in prior years’ consolidated financial statements in order to conform to the current year presentation.</p> <p style="MARGIN-BOTTOM: 0pt; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman; MARGIN-TOP: 12pt"> In the preparation of our consolidated financial statements as of December 31, 2013, management evaluated all material subsequent events or transactions that occurred after the balance sheet date through the date on which the financial statements were issued for potential recognition in our consolidated financial statements and/or disclosure in the notes thereto.</p> </div>
CY2013	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.08
CY2013	us-gaap	Nature Of Operations NatureOfOperations	<div> <p style="MARGIN-BOTTOM: 0pt; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman; MARGIN-TOP: 6pt"> <strong>Nature of Operations -</strong> Arthur J. Gallagher & Co. and its subsidiaries, collectively referred to herein as we, our or us or the company, provide insurance brokerage and risk management services to a wide variety of commercial, industrial, institutional and governmental organizations through three reportable operating segments. Commission and fee revenue generated by the brokerage segment is primarily related to the negotiation and placement of insurance for our clients. Fee revenue generated by the risk management segment is primarily related to claims management, information management, risk control consulting (loss control) services and appraisals in the property/casualty market. Investment income and other revenue are generated from our investment portfolio, which includes invested cash and restricted funds, as well as clean energy and other investments. We are headquartered in Itasca, Illinois, have operations in 24 countries and offer client-service capabilities in more than 140 countries globally through a network of correspondent insurance brokers and consultants.</p> </div>
CY2013	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Outstanding Weighted Average Remaining Contractual Term2 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2	P3Y7M13D
CY2013	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod	1700000	shares
CY2013	us-gaap	Business Acquisition Pro Forma Earnings Per Share Basic BusinessAcquisitionProFormaEarningsPerShareBasic	2.17
CY2013	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.021	pure
CY2013	us-gaap	Variable Interest Entity Ownership Percentage VariableInterestEntityOwnershipPercentage	0.50	pure
CY2013	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Fair Value Assumptions Expected Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1	P6Y
CY2013	us-gaap	Effective Income Tax Rate Reconciliation Change In Deferred Tax Assets Valuation Allowance EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance	0.002	pure
CY2013	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Grants In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice	39.17
CY2013	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	-0.006	pure
CY2013	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	1600000	shares
CY2013	us-gaap	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Discount Rate DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate	0.0400	pure
CY2013	us-gaap	Effective Income Tax Rate Reconciliation Foreign Income Tax Rate Differential EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential	-0.003	pure
CY2013	us-gaap	Business Acquisition Pro Forma Earnings Per Share Diluted BusinessAcquisitionProFormaEarningsPerShareDiluted	2.14
CY2013	us-gaap	Business Acquisition Equity Interests Issued Or Issuable Number Of Shares Issued BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued	5103000	shares
CY2013	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Dividend Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate	0.035	pure
CY2013	us-gaap	Number Of Businesses Acquired NumberOfBusinessesAcquired	79	Entity
CY2013	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits EffectiveIncomeTaxRateReconciliationTaxCredits	-0.342	pure
CY2013	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	128900000	shares
CY2013	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	349900000
CY2013	us-gaap	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Expected Long Term Return On Assets DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets	0.0750	pure
CY2013	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice	27.11
CY2013	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	3	Segment
CY2013	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Weighted Average Remaining Contractual Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1	P2Y1M24D
CY2013	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Vested And Expected To Vest Outstanding Weighted Average Remaining Contractual Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageRemainingContractualTerm1	P3Y7M2D
CY2013	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	2300000	shares
CY2013	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.024	pure
CY2013	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Maximum Number Of Shares Per Employee ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumNumberOfSharesPerEmployee	200000	shares
CY2013	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod	100000	shares
CY2013	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	298800000
CY2013	us-gaap	Gain Loss On Investments GainLossOnInvestments	17100000
CY2013	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	182600000
CY2013	us-gaap	Use Of Estimates UseOfEstimates	<div> <p style="MARGIN-BOTTOM: 0pt; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman; MARGIN-TOP: 12pt"> <strong>Use of Estimates</strong> - The preparation of our consolidated financial statements in conformity with generally accepted accounting principles requires management to make estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. Such estimates and assumptions could change in the future as more information becomes known, which could impact the amounts reported and disclosed herein.</p> </div>
CY2013	us-gaap	Foreign Currency Transaction Gain Loss Before Tax ForeignCurrencyTransactionGainLossBeforeTax	200000
CY2013	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	2300000
CY2013	us-gaap	Revenues Revenues	3179600000
CY2013	us-gaap	Gain Loss On Foreign Currency Fair Value Hedge Derivatives GainLossOnForeignCurrencyFairValueHedgeDerivatives	2600000
CY2013	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	2900000
CY2013	us-gaap	Payments To Acquire Businesses Gross PaymentsToAcquireBusinessesGross	719600000
CY2013	us-gaap	Gain Loss On Sale Of Equity Investments GainLossOnSaleOfEquityInvestments	5200000
CY2013	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	727700000
CY2013	us-gaap	Increase Decrease In Premiums Receivable IncreaseDecreaseInPremiumsReceivable	85400000
CY2013	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	43700000
CY2013	us-gaap	Repayments Of Lines Of Credit RepaymentsOfLinesOfCredit	489000000
CY2013	us-gaap	Increase Decrease In Deferred Income Taxes IncreaseDecreaseInDeferredIncomeTaxes	53800000
CY2013	us-gaap	Business Acquisitions Pro Forma Income Loss From Continuing Operations Before Changes In Accounting And Extraordinary Items Net Of Tax BusinessAcquisitionsProFormaIncomeLossFromContinuingOperationsBeforeChangesInAccountingAndExtraordinaryItemsNetOfTax	286300000
CY2013	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	230800000
CY2013	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Net Unamortized Gain Loss Arising During Period Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax	36000000
CY2013	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	61800000
CY2013	us-gaap	Income Taxes Paid IncomeTaxesPaid	49200000
CY2013	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	57400000
CY2013	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	1800000
CY2013	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Before Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditBeforeTax	7900000
CY2013	us-gaap	Business Acquisitions Pro Forma Net Income Loss BusinessAcquisitionsProFormaNetIncomeLoss	10200000
CY2013	us-gaap	Stock Issued During Period Value Acquisitions StockIssuedDuringPeriodValueAcquisitions	232200000
CY2013	us-gaap	Other Sales Revenue Net OtherSalesRevenueNet	11800000
CY2013	us-gaap	Income Tax Reconciliation Tax Credits IncomeTaxReconciliationTaxCredits	93800000
CY2013	us-gaap	Defined Benefit Plan Amortization Of Gains Losses DefinedBenefitPlanAmortizationOfGainsLosses	-7900000
CY2013	us-gaap	Stock Granted During Period Value Sharebased Compensation StockGrantedDuringPeriodValueSharebasedCompensation	7700000
CY2013	us-gaap	Business Acquisitions Pro Forma Revenue BusinessAcquisitionsProFormaRevenue	3461200000
CY2013	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	-268600000
CY2013	us-gaap	Interest Paid InterestPaid	49200000
CY2013	us-gaap	Payments For Proceeds From Investments PaymentsForProceedsFromInvestments	35900000
CY2013	us-gaap	Defined Benefit Plan Actuarial Gain Loss DefinedBenefitPlanActuarialGainLoss	-22400000
CY2013	us-gaap	Foreign Currency Transaction Gain Loss Unrealized ForeignCurrencyTransactionGainLossUnrealized	200000
CY2013	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	274500000
CY2013	us-gaap	Investment Income Net InvestmentIncomeNet	8100000
CY2013	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	2200000
CY2013	us-gaap	Net Income Loss NetIncomeLoss	268600000
CY2013	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	17900000
CY2013	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Gain Loss Arising During Period Net Of Tax OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax	1600000
CY2013	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	10200000
CY2013	us-gaap	Brokerage Commissions Revenue BrokerageCommissionsRevenue	1059500000
CY2013	us-gaap	Stock Issued During Period Value Other StockIssuedDuringPeriodValueOther	4300000
CY2013	us-gaap	Defined Benefit Plan Expected Return On Plan Assets DefinedBenefitPlanExpectedReturnOnPlanAssets	17000000
CY2013	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	93600000
CY2013	us-gaap	Increase Decrease In Restricted Cash IncreaseDecreaseInRestrictedCash	58600000
CY2013	us-gaap	Increase Decrease In Reinsurance Payables IncreaseDecreaseInReinsurancePayables	114300000
CY2013	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	665000000
CY2013	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	1300000
CY2013	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax	7900000
CY2013	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	502600000
CY2013	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Transition Asset Obligation Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetTransitionAssetObligationBeforeTax	-40700000
CY2013	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	500000
CY2013	us-gaap	Impairment Of Intangible Assets Finitelived ImpairmentOfIntangibleAssetsFinitelived	2200000
CY2013	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	178600000
CY2013	us-gaap	State And Local Income Tax Expense Benefit Continuing Operations StateAndLocalIncomeTaxExpenseBenefitContinuingOperations	10000000
CY2013	us-gaap	Defined Benefit Plan Amount To Be Amortized From Accumulated Other Comprehensive Income Loss Next Fiscal Year DefinedBenefitPlanAmountToBeAmortizedFromAccumulatedOtherComprehensiveIncomeLossNextFiscalYear	2400000
CY2013	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesBeforeTax	900000
CY2013	us-gaap	Business Combination Separately Recognized Transactions Additional Disclosures Acquisition Cost Expensed BusinessCombinationSeparatelyRecognizedTransactionsAdditionalDisclosuresAcquisitionCostExpensed	11900000
CY2013	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	182600000
CY2013	us-gaap	Adjustment For Amortization AdjustmentForAmortization	125200000
CY2013	us-gaap	Defined Benefit Plan Actual Return On Plan Assets DefinedBenefitPlanActualReturnOnPlanAssets	30600000
CY2013	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax	1300000
CY2013	us-gaap	Defined Benefit Plan Net Periodic Benefit Cost DefinedBenefitPlanNetPeriodicBenefitCost	3200000
CY2013	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	96400000
CY2013	us-gaap	Share Based Compensation ShareBasedCompensation	7700000
CY2013	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	-4000000
CY2013	us-gaap	Defined Benefit Plan Benefits Paid DefinedBenefitPlanBenefitsPaid	9400000
CY2013	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	10600000
CY2013	us-gaap	Operating Leases Rent Expense Net OperatingLeasesRentExpenseNet	91.3
CY2013	us-gaap	Goodwill Translation And Purchase Accounting Adjustments GoodwillTranslationAndPurchaseAccountingAdjustments	4200000
CY2013	us-gaap	Interest Expense InterestExpense	50100000
CY2013	us-gaap	Increase Decrease In Accrued Income Taxes Payable IncreaseDecreaseInAccruedIncomeTaxesPayable	4300000
CY2013	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	6500000
CY2013	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	76200000
CY2013	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Reclassification Adjustment From Aoci Realized Upon Sale Or Liquidation Before Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationReclassificationAdjustmentFromAOCIRealizedUponSaleOrLiquidationBeforeTax	0
CY2013	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	96100000
CY2013	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities
CY2013	us-gaap	Income Tax Credits And Adjustments IncomeTaxCreditsAndAdjustments	130000000
CY2013	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	28500000
CY2013	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-47700000
CY2013	us-gaap	Defined Benefit Plan Interest Cost DefinedBenefitPlanInterestCost	11700000
CY2013	us-gaap	Benefits Losses And Expenses BenefitsLossesAndExpenses	2905100000
CY2013	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	200000000
CY2013	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax	-43900000
CY2013	us-gaap	Goodwill Purchase Accounting Adjustments GoodwillPurchaseAccountingAdjustments	3300000
CY2013	us-gaap	Proceeds From Lines Of Credit ProceedsFromLinesOfCredit	890500000
CY2013	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-600000
CY2013	us-gaap	Federal Income Tax Expense Benefit Continuing Operations FederalIncomeTaxExpenseBenefitContinuingOperations	-18700000
CY2013	us-gaap	Cost Of Revenue CostOfRevenue	437300000
CY2013	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-851700000
CY2013	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-26800000
CY2013	us-gaap	Depreciation Depreciation	53400000
CY2013	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	7200000
CY2013	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	-13900000
CY2013	us-gaap	Income Tax Reconciliation Foreign Income Tax Rate Differential IncomeTaxReconciliationForeignIncomeTaxRateDifferential	-800000
CY2013	us-gaap	Labor And Related Expense LaborAndRelatedExpense	1685000000
CY2013	us-gaap	Defined Benefit Plan Service Cost DefinedBenefitPlanServiceCost	600000
CY2013	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	1400000
CY2013	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	29000000
CY2013	us-gaap	Defined Benefit Plan Contributions By Employer DefinedBenefitPlanContributionsByEmployer	6300000
CY2013	us-gaap	Foreign Income Tax Expense Benefit Continuing Operations ForeignIncomeTaxExpenseBenefitContinuingOperations	14600000
CY2013	us-gaap	Operating Expenses OperatingExpenses	552400000
CY2013	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-1600000
CY2013	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	5900000
CY2013	us-gaap	Effect Of Exchange Rate On Cash And Cash Equivalents EffectOfExchangeRateOnCashAndCashEquivalents	-4800000
CY2013	ajg	Net Proceeds From Sales Of Operations NetProceedsFromSalesOfOperations	5500000
CY2013	ajg	Supplemental Commissions SupplementalCommissions	77300000
CY2013	ajg	Ultimate Award Value Multiples Of Original Value Of Units Minimum UltimateAwardValueMultiplesOfOriginalValueOfUnitsMinimum	0.5	Times
CY2013	ajg	Tax Expense From Issuance Of Common Stock TaxExpenseFromIssuanceOfCommonStock	7500000
CY2013	ajg	Effective Income Tax Rate Reconciliation Foreign Dividends And Other Permanent Differences EffectiveIncomeTaxRateReconciliationForeignDividendsAndOtherPermanentDifferences	-0.009	pure
CY2013	ajg	Amount Of Commitment Expiration Off Balance Sheet Commitments Within Year Five AmountOfCommitmentExpirationOffBalanceSheetCommitmentsWithinYearFive
CY2013	ajg	Options To Purchase Common Stock Shares Outstanding OptionsToPurchaseCommonStockSharesOutstanding	1300000	shares
CY2013	ajg	Cash And Equity Award With Aggregate Fair Value Vested And Distributed To Participants CashAndEquityAwardWithAggregateFairValueVestedAndDistributedToParticipants	1400000
CY2013	ajg	Expected Period Of Return On Plan Assets ExpectedPeriodOfReturnOnPlanAssets	P10Y
CY2013	ajg	Income Tax Reconciliation Foreign Dividends And Other Permanent Differences IncomeTaxReconciliationForeignDividendsAndOtherPermanentDifferences	-2500000
CY2013	ajg	Net Change In Fees Receivable Unearned Fees NetChangeInFeesReceivableUnearnedFees	5900000
CY2013	ajg	Number Of Clean Coal Production Plants Seeking And Negotiating For Long Term Production Contract NumberOfCleanCoalProductionPlantsSeekingAndNegotiatingForLongTermProductionContract	6	Plant
CY2013	ajg	Number Of Countries In Which Company Has Operations NumberOfCountriesInWhichCompanyHasOperations	24	Country
CY2013	ajg	Deferred Equity Participation Plan Distributions To Key Executives Age DeferredEquityParticipationPlanDistributionsToKeyExecutivesAge	Age 62 (or the one-year anniversary of the date of the grant for participants over the age of 61 as of the grant date) or upon or after their actual retirement
CY2013	ajg	Contingent Commissions ContingentCommissions	52100000
CY2013	ajg	Unearned Deferred Compensation Value UnearnedDeferredCompensationValue	26300000
CY2013	ajg	Tax Impact From Issuance Of Common Stock TaxImpactFromIssuanceOfCommonStock	7500000
CY2013	ajg	Income Tax Reconciliation Changes In Unrecognized Tax Benefits Related To Resolution Of Federal And State Audits Expiration Of Various Statutes Of Limitations And Other Items IncomeTaxReconciliationChangesInUnrecognizedTaxBenefitsRelatedToResolutionOfFederalAndStateAuditsExpirationOfVariousStatutesOfLimitationsAndOtherItems	1500000
CY2013	ajg	Allowances For Estimated Policy Cancellations AllowancesForEstimatedPolicyCancellations	4200000
CY2013	ajg	Fee Revenue Generation Period FeeRevenueGenerationPeriod	P1Y
CY2013	ajg	Acquired Property Through Lease Percentage AcquiredPropertyThroughLeasePercentage	0.60	pure
CY2013	ajg	Ultimate Award Value Multiples Of Original Value Of Units Maximum UltimateAwardValueMultiplesOfOriginalValueOfUnitsMaximum	1.5	Times
CY2013	ajg	Effective Income Tax Rate Reconciliation Changes In Unrecognized Tax Benefits Related To Resolution Of Federal And State Audits Expiration Of Various Statutes Of Limitations And Other Items EffectiveIncomeTaxRateReconciliationChangesInUnrecognizedTaxBenefitsRelatedToResolutionOfFederalAndStateAuditsExpirationOfVariousStatutesOfLimitationsAndOtherItems	0.005	pure
CY2013	ajg	Amount Of Commitment Expiration Off Balance Sheet Commitments Within Year Three AmountOfCommitmentExpirationOffBalanceSheetCommitmentsWithinYearThree
CY2013	ajg	Business Combination Aggregate Earnout Obligation Recorded Maximum BusinessCombinationAggregateEarnoutObligationRecordedMaximum	162700000
CY2013	ajg	Minimum Exercise Price Of Stock Options Percent Of Fair Market Value Of Share Of Common Stock On Date Of Grant MinimumExercisePriceOfStockOptionsPercentOfFairMarketValueOfShareOfCommonStockOnDateOfGrant	1.00	pure
CY2013	ajg	Number Of Periods Options Expire NumberOfPeriodsOptionsExpire	P7Y
CY2013	ajg	Deferred Compensation And Restricted Stock DeferredCompensationAndRestrictedStock	-13000000
CY2013	ajg	Maturity Period Of Short Term Investments MaturityPeriodOfShortTermInvestments	90 days or less
CY2013	ajg	Amortization Of Deferred Compensation And Restricted Stock AmortizationOfDeferredCompensationAndRestrictedStock	19000000
CY2013	ajg	Acquired Property Through Lease Area AcquiredPropertyThroughLeaseArea	306000	sqft
CY2013	ajg	Revenues From Clean Coal Activities RevenuesFromCleanCoalActivities	412500000
CY2013	ajg	Maximum Period For Exercise Of Stock Options MaximumPeriodForExerciseOfStockOptions	P7Y
CY2013	ajg	Amount Of Commitment Expiration Off Balance Sheet Commitments Within Year One AmountOfCommitmentExpirationOffBalanceSheetCommitmentsWithinYearOne	8500000
CY2013	ajg	Operating Lease Commitment Expiration Date OperatingLeaseCommitmentExpirationDate	2018-02-28
CY2013	ajg	Recorded Earn Out Payable RecordedEarnOutPayable	50300000
CY2013	ajg	Unearned Deferred Compensation Share UnearnedDeferredCompensationShare	2100000	shares
CY2013	ajg	Number Of Countries In Which Company Does Business Through Network Of Correspondent Brokers And Consultants NumberOfCountriesInWhichCompanyDoesBusinessThroughNetworkOfCorrespondentBrokersAndConsultants	140	Country
CY2013	ajg	Weighted Average Number Of Common And Common Equivalent Shares Outstanding WeightedAverageNumberOfCommonAndCommonEquivalentSharesOutstanding	130500000	shares
CY2013	ajg	Change In Estimated Acquisition Earnout Payables ChangeInEstimatedAcquisitionEarnoutPayables	1700000
CY2013	ajg	Amount Of Commitment Expiration Off Balance Sheet Commitments AmountOfCommitmentExpirationOffBalanceSheetCommitments	36500000
CY2013	ajg	Amount Of Commitment Expiration Off Balance Sheet Commitments Within Year Four AmountOfCommitmentExpirationOffBalanceSheetCommitmentsWithinYearFour
CY2013	ajg	Net Change In Accrued Compensation And Other Accrued Liabilities NetChangeInAccruedCompensationAndOtherAccruedLiabilities	-36300000
CY2013	ajg	Number Of Letter Of Credit Issued NumberOfLetterOfCreditIssued	2	LetterOfCredit
CY2013	ajg	Weighted Average Period WeightedAveragePeriod	P4Y
CY2013	ajg	Amount Of Commitment Expiration Off Balance Sheet Commitments Within Year Thereafter AmountOfCommitmentExpirationOffBalanceSheetCommitmentsWithinYearThereafter	28000000
CY2013	ajg	Commissions Commissions	1553100000
CY2013	ajg	Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Expected Long Term Return On Plan Assets DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationExpectedLongTermReturnOnPlanAssets	0.0750	pure
CY2013	ajg	Business Combination Aggregate Earnout Obligation Maximum BusinessCombinationAggregateEarnoutObligationMaximum	462300000
CY2013	ajg	Amount Of Commitment Expiration Off Balance Sheet Commitments Within Year Two AmountOfCommitmentExpirationOffBalanceSheetCommitmentsWithinYearTwo
CY2013	ajg	Debt Acquisition Costs DebtAcquisitionCosts	1300000
CY2013	ajg	Matching Contributions Vesting Schedule MatchingContributionsVestingSchedule	P5Y
CY2012	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod	352000	shares
CY2012	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate	0.012	pure
CY2012	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.59
CY2012	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	1.36
CY2012	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Volatility Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate	0.269	pure
CY2012	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.350	pure
CY2012	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Forfeitures In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice	29.46
CY2012	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.61
CY2012	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Outstanding Weighted Average Remaining Contractual Term2 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2	P3Y4M28D
CY2012	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod	1400000	shares
CY2012	us-gaap	Business Acquisition Pro Forma Earnings Per Share Basic BusinessAcquisitionProFormaEarningsPerShareBasic	1.69
CY2012	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.205	pure
CY2012	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Fair Value Assumptions Expected Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1	P5Y
CY2012	us-gaap	Effective Income Tax Rate Reconciliation Change In Deferred Tax Assets Valuation Allowance EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance	0.001	pure
CY2012	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Grants In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice	35.71
CY2012	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	0.006	pure
CY2012	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	1500000	shares
CY2012	us-gaap	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Discount Rate DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate	0.0450	pure
CY2012	us-gaap	Effective Income Tax Rate Reconciliation Foreign Income Tax Rate Differential EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential	0.004	pure
CY2012	us-gaap	Business Acquisition Pro Forma Earnings Per Share Diluted BusinessAcquisitionProFormaEarningsPerShareDiluted	1.67
CY2012	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Dividend Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate	0.040	pure
CY2012	us-gaap	Number Of Businesses Acquired NumberOfBusinessesAcquired	46	Entity
CY2012	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	343000000
CY2012	us-gaap	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Expected Long Term Return On Assets DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets	0.0750	pure
CY2012	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice	26.14
CY2012	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits EffectiveIncomeTaxRateReconciliationTaxCredits	-0.185	pure
CY2012	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	121000000	shares
CY2012	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Weighted Average Remaining Contractual Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1	P2Y6M7D
CY2012	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Vested And Expected To Vest Outstanding Weighted Average Remaining Contractual Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageRemainingContractualTerm1	P3Y4M21D
CY2012	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	2800000	shares
CY2012	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.038	pure
CY2012	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod	200000	shares
CY2012	us-gaap	Foreign Currency Transaction Gain Loss Before Tax ForeignCurrencyTransactionGainLossBeforeTax	-1900000
CY2012	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	1100000
CY2012	us-gaap	Revenues Revenues	2520300000
CY2012	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	1700000
CY2012	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	209400000
CY2012	us-gaap	Gain Loss On Investments GainLossOnInvestments	3900000
CY2012	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	204400000
CY2012	us-gaap	Gain Loss On Sale Of Equity Investments GainLossOnSaleOfEquityInvestments	3900000
CY2012	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	344100000
CY2012	us-gaap	Goodwill Written Off Related To Sale Of Business Unit GoodwillWrittenOffRelatedToSaleOfBusinessUnit
CY2012	us-gaap	Increase Decrease In Premiums Receivable IncreaseDecreaseInPremiumsReceivable	-11500000
CY2012	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	10600000
CY2012	us-gaap	Repayments Of Lines Of Credit RepaymentsOfLinesOfCredit	184000000
CY2012	us-gaap	Increase Decrease In Deferred Income Taxes IncreaseDecreaseInDeferredIncomeTaxes	20400000
CY2012	us-gaap	Business Acquisitions Pro Forma Income Loss From Continuing Operations Before Changes In Accounting And Extraordinary Items Net Of Tax BusinessAcquisitionsProFormaIncomeLossFromContinuingOperationsBeforeChangesInAccountingAndExtraordinaryItemsNetOfTax	212900000
CY2012	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	234700000
CY2012	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Net Unamortized Gain Loss Arising During Period Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax	-10600000
CY2012	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	73900000
CY2012	us-gaap	Income Taxes Paid IncomeTaxesPaid	47500000
CY2012	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	-52400000
CY2012	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	1700000
CY2012	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Before Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditBeforeTax	7200000
CY2012	us-gaap	Business Acquisitions Pro Forma Net Income Loss BusinessAcquisitionsProFormaNetIncomeLoss	5900000
CY2012	us-gaap	Stock Issued During Period Value Acquisitions StockIssuedDuringPeriodValueAcquisitions	276300000
CY2012	us-gaap	Other Sales Revenue Net OtherSalesRevenueNet	1400000
CY2012	us-gaap	Income Tax Reconciliation Tax Credits IncomeTaxReconciliationTaxCredits	45300000
CY2012	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	33700000
CY2012	us-gaap	Net Income Loss NetIncomeLoss	195000000
CY2012	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	-200000
CY2012	us-gaap	Defined Benefit Plan Amortization Of Gains Losses DefinedBenefitPlanAmortizationOfGainsLosses	-7200000
CY2012	us-gaap	Stock Granted During Period Value Sharebased Compensation StockGrantedDuringPeriodValueSharebasedCompensation	7200000
CY2012	us-gaap	Business Acquisitions Pro Forma Revenue BusinessAcquisitionsProFormaRevenue	2903600000
CY2012	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	-195000000
CY2012	us-gaap	Interest Paid InterestPaid	42200000
CY2012	us-gaap	Payments For Proceeds From Investments PaymentsForProceedsFromInvestments	-1500000
CY2012	us-gaap	Defined Benefit Plan Actuarial Gain Loss DefinedBenefitPlanActuarialGainLoss	20900000
CY2012	us-gaap	Foreign Currency Transaction Gain Loss Unrealized ForeignCurrencyTransactionGainLossUnrealized	-1900000
CY2012	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	245300000
CY2012	us-gaap	Investment Income Net InvestmentIncomeNet	10400000
CY2012	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Gain Loss Arising During Period Net Of Tax OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax	16100000
CY2012	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	8400000
CY2012	us-gaap	Brokerage Commissions Revenue BrokerageCommissionsRevenue	971700000
CY2012	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	1500000
CY2012	us-gaap	Defined Benefit Plan Expected Return On Plan Assets DefinedBenefitPlanExpectedReturnOnPlanAssets	15200000
CY2012	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	51000000
CY2012	us-gaap	Increase Decrease In Restricted Cash IncreaseDecreaseInRestrictedCash	90200000
CY2012	us-gaap	Increase Decrease In Reinsurance Payables IncreaseDecreaseInReinsurancePayables	33300000
CY2012	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	308800000
CY2012	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions
CY2012	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax	7200000
CY2012	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	45900000
CY2012	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Transition Asset Obligation Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetTransitionAssetObligationBeforeTax	7600000
CY2012	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	300000
CY2012	us-gaap	Impairment Of Intangible Assets Finitelived ImpairmentOfIntangibleAssetsFinitelived	3500000
CY2012	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	140400000
CY2012	us-gaap	State And Local Income Tax Expense Benefit Continuing Operations StateAndLocalIncomeTaxExpenseBenefitContinuingOperations	14400000
CY2012	us-gaap	Defined Benefit Plan Amount To Be Amortized From Accumulated Other Comprehensive Income Loss Next Fiscal Year DefinedBenefitPlanAmountToBeAmortizedFromAccumulatedOtherComprehensiveIncomeLossNextFiscalYear	7700000
CY2012	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesBeforeTax	200000
CY2012	us-gaap	Business Combination Separately Recognized Transactions Additional Disclosures Acquisition Cost Expensed BusinessCombinationSeparatelyRecognizedTransactionsAdditionalDisclosuresAcquisitionCostExpensed	9300000
CY2012	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	167500000
CY2012	us-gaap	Adjustment For Amortization AdjustmentForAmortization	99000000
CY2012	us-gaap	Defined Benefit Plan Actual Return On Plan Assets DefinedBenefitPlanActualReturnOnPlanAssets	25500000
CY2012	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax	1100000
CY2012	us-gaap	Defined Benefit Plan Net Periodic Benefit Cost DefinedBenefitPlanNetPeriodicBenefitCost	4200000
CY2012	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	21100000
CY2012	us-gaap	Share Based Compensation ShareBasedCompensation	7500000
CY2012	us-gaap	Stock Repurchased During Period Value StockRepurchasedDuringPeriodValue	1500000
CY2012	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	10900000
CY2012	us-gaap	Defined Benefit Plan Benefits Paid DefinedBenefitPlanBenefitsPaid	8200000
CY2012	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	17300000
CY2012	us-gaap	Operating Leases Rent Expense Net OperatingLeasesRentExpenseNet	91.0
CY2012	us-gaap	Goodwill Translation And Purchase Accounting Adjustments GoodwillTranslationAndPurchaseAccountingAdjustments	9300000
CY2012	us-gaap	Interest Expense InterestExpense	43000000
CY2012	us-gaap	Increase Decrease In Accrued Income Taxes Payable IncreaseDecreaseInAccruedIncomeTaxesPayable	14000000
CY2012	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	9400000
CY2012	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	82300000
CY2012	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Reclassification Adjustment From Aoci Realized Upon Sale Or Liquidation Before Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationReclassificationAdjustmentFromAOCIRealizedUponSaleOrLiquidationBeforeTax	0
CY2012	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	85900000
CY2012	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-14600000
CY2012	us-gaap	Defined Benefit Plan Interest Cost DefinedBenefitPlanInterestCost	11800000
CY2012	us-gaap	Cost Of Revenue CostOfRevenue	111600000
CY2012	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-382200000
CY2012	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	3400000
CY2012	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax	3400000
CY2012	us-gaap	Goodwill Purchase Accounting Adjustments GoodwillPurchaseAccountingAdjustments	-800000
CY2012	us-gaap	Proceeds From Lines Of Credit ProceedsFromLinesOfCredit	303000000
CY2012	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-2900000
CY2012	us-gaap	Federal Income Tax Expense Benefit Continuing Operations FederalIncomeTaxExpenseBenefitContinuingOperations	30800000
CY2012	us-gaap	Benefits Losses And Expenses BenefitsLossesAndExpenses	2275000000
CY2012	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	50000000
CY2012	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	300000
CY2012	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	8700000
CY2012	us-gaap	Depreciation Depreciation	41400000
CY2012	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	5400000
CY2012	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	-3600000
CY2012	us-gaap	Income Tax Reconciliation Foreign Income Tax Rate Differential IncomeTaxReconciliationForeignIncomeTaxRateDifferential	900000
CY2012	us-gaap	Labor And Related Expense LaborAndRelatedExpense	1493400000
CY2012	us-gaap	Defined Benefit Plan Service Cost DefinedBenefitPlanServiceCost	400000
CY2012	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	1600000
CY2012	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	45400000
CY2012	us-gaap	Defined Benefit Plan Contributions By Employer DefinedBenefitPlanContributionsByEmployer	7200000
CY2012	us-gaap	Foreign Income Tax Expense Benefit Continuing Operations ForeignIncomeTaxExpenseBenefitContinuingOperations	5100000
CY2012	us-gaap	Operating Expenses OperatingExpenses	483200000
CY2012	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	1200000
CY2012	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	50300000
CY2012	us-gaap	Effect Of Exchange Rate On Cash And Cash Equivalents EffectOfExchangeRateOnCashAndCashEquivalents	4200000
CY2012	ajg	Net Proceeds From Sales Of Operations NetProceedsFromSalesOfOperations	11400000
CY2012	ajg	Supplemental Commissions SupplementalCommissions	67900000
CY2012	ajg	Tax Expense From Issuance Of Common Stock TaxExpenseFromIssuanceOfCommonStock	500000
CY2012	ajg	Effective Income Tax Rate Reconciliation Foreign Dividends And Other Permanent Differences EffectiveIncomeTaxRateReconciliationForeignDividendsAndOtherPermanentDifferences	-0.011	pure
CY2012	ajg	Options To Purchase Common Stock Shares Outstanding OptionsToPurchaseCommonStockSharesOutstanding	1100000	shares
CY2012	ajg	Cash And Equity Award With Aggregate Fair Value Vested And Distributed To Participants CashAndEquityAwardWithAggregateFairValueVestedAndDistributedToParticipants	700000
CY2012	ajg	Income Tax Reconciliation Foreign Dividends And Other Permanent Differences IncomeTaxReconciliationForeignDividendsAndOtherPermanentDifferences	-2700000
CY2012	ajg	Net Change In Fees Receivable Unearned Fees NetChangeInFeesReceivableUnearnedFees	-4300000
CY2012	ajg	Goodwill Earnout Adjustments GoodwillEarnoutAdjustments	-100000
CY2012	ajg	Allowances For Estimated Policy Cancellations AllowancesForEstimatedPolicyCancellations	4000000
CY2012	ajg	Effective Income Tax Rate Reconciliation Changes In Unrecognized Tax Benefits Related To Resolution Of Federal And State Audits Expiration Of Various Statutes Of Limitations And Other Items EffectiveIncomeTaxRateReconciliationChangesInUnrecognizedTaxBenefitsRelatedToResolutionOfFederalAndStateAuditsExpirationOfVariousStatutesOfLimitationsAndOtherItems	0.002	pure
CY2012	ajg	Business Combination Aggregate Earnout Obligation Recorded Maximum BusinessCombinationAggregateEarnoutObligationRecordedMaximum	139800000
CY2012	ajg	Number Of Periods Options Expire NumberOfPeriodsOptionsExpire	P7Y
CY2012	ajg	Contingent Commissions ContingentCommissions	42900000
CY2012	ajg	Unearned Deferred Compensation Value UnearnedDeferredCompensationValue	5600000
CY2012	ajg	Tax Impact From Issuance Of Common Stock TaxImpactFromIssuanceOfCommonStock	500000
CY2012	ajg	Income Tax Reconciliation Changes In Unrecognized Tax Benefits Related To Resolution Of Federal And State Audits Expiration Of Various Statutes Of Limitations And Other Items IncomeTaxReconciliationChangesInUnrecognizedTaxBenefitsRelatedToResolutionOfFederalAndStateAuditsExpirationOfVariousStatutesOfLimitationsAndOtherItems	600000
CY2012	ajg	Deferred Compensation And Restricted Stock DeferredCompensationAndRestrictedStock	8000000
CY2012	ajg	Amortization Of Deferred Compensation And Restricted Stock AmortizationOfDeferredCompensationAndRestrictedStock	8300000
CY2012	ajg	Revenues From Clean Coal Activities RevenuesFromCleanCoalActivities	119600000
CY2012	ajg	Unearned Deferred Compensation Share UnearnedDeferredCompensationShare	800000	shares
CY2012	ajg	Weighted Average Number Of Common And Common Equivalent Shares Outstanding WeightedAverageNumberOfCommonAndCommonEquivalentSharesOutstanding	122500000	shares
CY2012	ajg	Change In Estimated Acquisition Earnout Payables ChangeInEstimatedAcquisitionEarnoutPayables	3400000
CY2012	ajg	Additional Equity Compensation Expenses AdditionalEquityCompensationExpenses	300000
CY2012	ajg	Net Change In Accrued Compensation And Other Accrued Liabilities NetChangeInAccruedCompensationAndOtherAccruedLiabilities	-19200000
CY2012	ajg	Commissions Commissions	1302500000
CY2012	ajg	Fair Value Of Funded Cash Award Assets FairValueOfFundedCashAwardAssets	41600000
CY2012	ajg	Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Expected Long Term Return On Plan Assets DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationExpectedLongTermReturnOnPlanAssets	0.0750	pure
CY2012	ajg	Business Combination Aggregate Earnout Obligation Maximum BusinessCombinationAggregateEarnoutObligationMaximum	384800000
	us-gaap	Number Of Businesses Acquired NumberOfBusinessesAcquired	279	Entity
CY2011Q1	ajg	Compensation Approved By Committee Value CompensationApprovedByCommitteeValue	6500000
CY2013Q1	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.32
CY2013Q1	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.32
CY2013Q1	us-gaap	Revenues Revenues	674100000
CY2013Q1	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	42300000
CY2013Q1	us-gaap	Net Income Loss NetIncomeLoss	40500000
CY2013Q1	us-gaap	Benefits Losses And Expenses BenefitsLossesAndExpenses	-631800000
CY2013Q1	ajg	Compensation Approved By Committee Value CompensationApprovedByCommitteeValue	8000000
CY2012Q1	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.24
CY2012Q1	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.24
CY2012Q1	us-gaap	Revenues Revenues	546800000
CY2012Q1	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	32500000
CY2012Q1	us-gaap	Net Income Loss NetIncomeLoss	28100000
CY2012Q1	us-gaap	Benefits Losses And Expenses BenefitsLossesAndExpenses	-514300000
CY2012Q1	ajg	Compensation Approved By Committee Value CompensationApprovedByCommitteeValue	7300000
CY2012Q2	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.60
CY2012Q2	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.59
CY2012Q2	us-gaap	Revenues Revenues	649900000
CY2012Q2	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	91100000
CY2012Q2	us-gaap	Net Income Loss NetIncomeLoss	71700000
CY2012Q2	us-gaap	Benefits Losses And Expenses BenefitsLossesAndExpenses	-558800000
CY2013Q2	us-gaap	Stock Repurchased And Retired During Period Shares StockRepurchasedAndRetiredDuringPeriodShares	1200000	shares
CY2013Q2	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.73
CY2013Q2	us-gaap	Benefits Losses And Expenses BenefitsLossesAndExpenses	-682100000
CY2013Q2	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.73
CY2013Q2	us-gaap	Revenues Revenues	779500000
CY2013Q2	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	97400000
CY2013Q2	us-gaap	Net Income Loss NetIncomeLoss	93500000
CY2013Q2	us-gaap	Stock Repurchased And Retired During Period Value StockRepurchasedAndRetiredDuringPeriodValue	52400000
CY2012Q3	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.50
CY2012Q3	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.50
CY2012Q3	us-gaap	Revenues Revenues	650400000
CY2012Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	76300000
CY2012Q3	us-gaap	Net Income Loss NetIncomeLoss	61700000
CY2012Q3	us-gaap	Benefits Losses And Expenses BenefitsLossesAndExpenses	-574100000
CY2013Q3	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.57
CY2013Q3	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.57
CY2013Q3	us-gaap	Revenues Revenues	835800000
CY2013Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	85500000
CY2013Q3	us-gaap	Net Income Loss NetIncomeLoss	74600000
CY2013Q3	us-gaap	Benefits Losses And Expenses BenefitsLossesAndExpenses	-750300000
CY2012Q4	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.27
CY2012Q4	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.27
CY2012Q4	us-gaap	Revenues Revenues	673200000
CY2012Q4	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	45400000
CY2012Q4	us-gaap	Net Income Loss NetIncomeLoss	33500000
CY2012Q4	us-gaap	Benefits Losses And Expenses BenefitsLossesAndExpenses	-627800000
CY2013Q4	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.45
CY2013Q4	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.45
CY2013Q4	us-gaap	Revenues Revenues	890200000
CY2013Q4	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	49300000
CY2013Q4	us-gaap	Net Income Loss NetIncomeLoss	60000000
CY2013Q4	us-gaap	Benefits Losses And Expenses BenefitsLossesAndExpenses	-840900000

Files In Submission

Name	View Source	Status
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0001193125-14-040834-index.html	Edgar Link	pending
0001193125-14-040834.txt	Edgar Link	pending
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2013 Q2 Form 10-K Financial Statement

#000119312514040834 Filed on February 07, 2014

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$AJG Arthur J. Gallagher & Co. Stock $ajg

2013 Q2 Form 10-K Financial Statement

#000119312514040834 Filed on February 07, 2014

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$AJG
Arthur J. Gallagher & Co. Stock $ajg