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

$ajg Overview Financials Valuation SEC Filings Company Website

2021 Q4 Form 10-K Financial Statement

#000156459022005714 Filed on February 18, 2022

Income Statement

Concept	2021 Q4	2021	2020 Q4
Revenue	$1.973B	$8.209B	$1.704B
YoY Change	15.8%	17.22%	-1.03%
Cost Of Revenue	$1.250B	$1.173B	$1.123B
YoY Change	11.28%	33.0%	-4.51%
Gross Profit	$723.0M	$7.036B	$580.6M
YoY Change	24.53%	14.94%	6.47%
Gross Profit Margin	36.65%	85.71%	34.08%
Selling, General & Admin	$20.60M	$20.60M
YoY Change		-83.72%
% of Gross Profit	2.85%	0.29%
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$146.5M	$151.2M	$133.5M
YoY Change	9.74%	4.2%	3.01%
% of Gross Profit	20.26%	2.15%	22.99%
Operating Expenses	$501.4M	$1.072B	$379.2M
YoY Change	32.23%	18.3%	-8.23%
Operating Profit	$221.6M	$5.964B	$201.4M
YoY Change	10.03%	14.36%	52.46%
Interest Expense	-$60.00M	$226.1M	-$43.40M
YoY Change	38.25%	15.12%	-9.77%
% of Operating Profit	-27.08%	3.79%	-21.55%
Other Income/Expense, Net
YoY Change
Pretax Income	$113.0M	$975.1M	$133.7M
YoY Change	-15.48%	11.96%	59.17%
Income Tax	-$7.900M	$20.10M	-$19.40M
% Of Pretax Income	-6.99%	2.06%	-14.51%
Net Earnings	$109.4M	$906.8M	$142.2M
YoY Change	-23.07%	10.75%	44.37%
Net Earnings / Revenue	5.55%	11.05%	8.35%
Basic Earnings Per Share		$4.47	$0.74
Diluted Earnings Per Share	$514.3K	$4.37	$0.72
COMMON SHARES
Basic Shares Outstanding		202.7M
Diluted Shares Outstanding

Balance Sheet

Concept	2021 Q4	2021	2020 Q4
SHORT-TERM ASSETS
Cash & Short-Term Investments	$402.6M	$402.6M	$665.0M
YoY Change	-39.46%	-39.46%	9.92%
Cash & Equivalents	$402.6M	$402.6M	$664.6M
Short-Term Investments
Other Short-Term Assets	$1.451B	$4.365B	$1.114B
YoY Change	30.26%	39.73%	3.68%
Inventory
Prepaid Expenses	$171.7M		$112.1M
Receivables		$730.0M
Other Receivables		$12.17B
Total Short-Term Assets	$17.67B	$17.67B	$11.12B
YoY Change	58.85%	58.85%	22.01%
LONG-TERM ASSETS
Property, Plant & Equipment	$500.8M	$859.4M	$450.7M
YoY Change	11.12%	4.17%	-3.57%
Goodwill	$8.666B		$6.127B
YoY Change	41.44%		9.05%
Intangibles	$3.954B		$2.400B
YoY Change	64.76%		3.5%
Long-Term Investments	$5.500M	$5.500M	$22.40M
YoY Change	-75.45%	-75.0%	-44.0%
Other Assets	$966.5M	$2.190B	$769.9M
YoY Change	25.54%	19.45%	-0.48%
Total Long-Term Assets	$15.67B	$15.67B	$11.21B
YoY Change	39.86%	39.86%	6.56%
TOTAL ASSETS
Total Short-Term Assets	$17.67B	$17.67B	$11.12B
Total Long-Term Assets	$15.67B	$15.67B	$11.21B
Total Assets	$33.35B	$33.35B	$22.33B
YoY Change	49.32%	49.32%	13.73%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$13.85B	$13.85B	$7.785B
YoY Change	77.85%	77.85%	22.62%
Accrued Expenses	$1.895B	$1.895B	$1.596B
YoY Change	18.74%	18.74%	20.82%
Deferred Revenue
YoY Change
Short-Term Debt	$245.0M	$228.4M	$75.00M
YoY Change	226.67%	11.96%	-87.9%
Long-Term Debt Due	$245.0M	$245.0M	$75.00M
YoY Change	226.67%	226.67%	-87.9%
Total Short-Term Liabilities	$16.74B	$16.74B	$10.14B
YoY Change	65.12%	65.12%	13.61%
LONG-TERM LIABILITIES
Long-Term Debt	$5.810B	$5.810B	$4.266B
YoY Change	36.2%	36.2%	11.79%
Other Long-Term Liabilities	$1.872B	$2.240B	$1.311B
YoY Change	42.76%	31.9%	3.11%
Total Long-Term Liabilities	$7.682B	$8.050B	$5.577B
YoY Change	37.74%	34.97%	9.62%
TOTAL LIABILITIES
Total Short-Term Liabilities	$16.74B	$16.74B	$10.14B
Total Long-Term Liabilities	$7.682B	$8.050B	$5.577B
Total Liabilities	$24.78B	$24.84B	$16.10B
YoY Change	53.96%	53.83%	11.65%
SHAREHOLDERS EQUITY
Retained Earnings	$2.882B		$2.372B
YoY Change	21.53%		24.74%
Common Stock	$6.352B		$4.458B
YoY Change	42.49%		11.07%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$8.508B	$8.508B	$6.186B
YoY Change
Total Liabilities & Shareholders Equity	$33.35B	$33.35B	$22.33B
YoY Change	49.32%	49.32%	13.73%

Cashflow Statement

Concept	2021 Q4	2021	2020 Q4
OPERATING ACTIVITIES
Net Income	$109.4M	$906.8M	$142.2M
YoY Change	-23.07%	10.75%	44.37%
Depreciation, Depletion And Amortization	$146.5M	$151.2M	$133.5M
YoY Change	9.74%	4.2%	3.01%
Cash From Operating Activities	$562.9M	$1.704B	$364.9M
YoY Change	54.26%	-5.7%	4.23%
INVESTING ACTIVITIES
Capital Expenditures	-$25.40M	-$128.6M	-$19.80M
YoY Change	28.28%	29.51%	-36.33%
Acquisitions
YoY Change
Other Investing Activities	-$2.685B	-$3.303B	-$234.2M
YoY Change	1046.29%	940.35%	-35.85%
Cash From Investing Activities	-$2.710B	-$3.432B	-$254.0M
YoY Change	966.93%	723.34%	-35.89%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net		$1.547B
YoY Change		1282.22%
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	682.5M	2.684B	-123.9M
YoY Change	-650.85%	-631.4%	-1377.32%
NET CHANGE
Cash From Operating Activities	562.9M	1.704B	364.9M
Cash From Investing Activities	-2.710B	-3.432B	-254.0M
Cash From Financing Activities	682.5M	2.684B	-123.9M
Net Change In Cash	-1.465B	892.0M	-13.00M
YoY Change	11166.15%	-6.14%	-64.29%
FREE CASH FLOW
Cash From Operating Activities	$562.9M	$1.704B	$364.9M
Capital Expenditures	-$25.40M	-$128.6M	-$19.80M
Free Cash Flow	$588.3M	$1.833B	$384.7M
YoY Change	52.92%	-3.87%	0.92%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value
CY2021	us-gaap	Open Tax Year OpenTaxYear	2011 2012
CY2021	ajg	Expected Period Of Return On Plan Assets ExpectedPeriodOfReturnOnPlanAssets	P10Y
CY2020	ajg	Expected Period Of Return On Plan Assets ExpectedPeriodOfReturnOnPlanAssets	P10Y
CY2021Q4	us-gaap	Revenue Remaining Performance Obligation Expected Timing Of Satisfaction Period1 RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1	P1Y
CY2021Q4	us-gaap	Revenue Remaining Performance Obligation Expected Timing Of Satisfaction Period1 RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1	P1Y
CY2021Q4	us-gaap	Revenue Remaining Performance Obligation Expected Timing Of Satisfaction Period1 RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1	P1Y
CY2021Q4	us-gaap	Revenue Remaining Performance Obligation Expected Timing Of Satisfaction Period1 RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1	P1Y
CY2021Q4	us-gaap	Revenue Remaining Performance Obligation Expected Timing Of Satisfaction Period1 RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1	P1Y
CY2021Q4	us-gaap	Revenue Remaining Performance Obligation Expected Timing Of Satisfaction Period1 RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1
CY2021	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Fair Value Assumptions Expected Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1	P5Y4M24D
CY2020	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Fair Value Assumptions Expected Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1	P5Y4M24D
CY2019	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Fair Value Assumptions Expected Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1	P5Y6M
CY2021	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Outstanding Weighted Average Remaining Contractual Term2 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2	P3Y10M24D
CY2021	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Weighted Average Remaining Contractual Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1	P1Y6M25D
CY2021	ajg	Sharebased Compensation Arrangement By Sharebased Payment Award Options Nonvested And Expected To Vest Outstanding Weighted Average Remaining Contractual Term SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedAndExpectedToVestOutstandingWeightedAverageRemainingContractualTerm	P4Y8M19D
CY2020	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Outstanding Weighted Average Remaining Contractual Term2 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2	P3Y10M9D
CY2020	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Weighted Average Remaining Contractual Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1	P1Y9M29D
CY2020	ajg	Sharebased Compensation Arrangement By Sharebased Payment Award Options Nonvested And Expected To Vest Outstanding Weighted Average Remaining Contractual Term SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedAndExpectedToVestOutstandingWeightedAverageRemainingContractualTerm	P4Y6M3D
CY2021	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Outstanding Weighted Average Remaining Contractual Term2 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2	P3Y10M24D
CY2021Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P5Y4M24D
CY2021Q4	us-gaap	Operating Lease Liability Current Statement Of Financial Position Extensible List OperatingLeaseLiabilityCurrentStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2021-01-31#OtherLiabilitiesCurrent
CY2021	ajg	Revenue From Contract With Customer Before Reimbursements Excluding Assessed Tax RevenueFromContractWithCustomerBeforeReimbursementsExcludingAssessedTax	8076400000
CY2021	ajg	Revenue From Contract With Customer Excluding Assessed Tax Reimbursements RevenueFromContractWithCustomerExcludingAssessedTaxReimbursements	133000000.0
CY2020	ajg	Revenue From Contract With Customer Excluding Assessed Tax Reimbursements RevenueFromContractWithCustomerExcludingAssessedTaxReimbursements	151700000
CY2021	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	8209400000
CY2020	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	7003600000
CY2019	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	7195000000.0
CY2021	us-gaap	Labor And Related Expense LaborAndRelatedExpense	3927500000
CY2020	us-gaap	Labor And Related Expense LaborAndRelatedExpense	3466500000
CY2019	us-gaap	Labor And Related Expense LaborAndRelatedExpense	3339500000
CY2021	us-gaap	Operating Expenses OperatingExpenses	1072400000
CY2020	us-gaap	Operating Expenses OperatingExpenses	906500000
CY2019	us-gaap	Operating Expenses OperatingExpenses	1068500000
CY2021	ajg	Cost Reimbursements CostReimbursements	133000000.0
CY2020	ajg	Cost Reimbursements CostReimbursements	151700000
CY2019	ajg	Cost Reimbursements CostReimbursements	138600000
CY2021	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	1173200000
CY2020	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	882100000
CY2019	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	1352800000
CY2021	us-gaap	Interest Expense InterestExpense	226100000
CY2020	us-gaap	Interest Expense InterestExpense	196400000
CY2019	us-gaap	Interest Expense InterestExpense	179800000
CY2021	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-16200000
CY2021	us-gaap	Depreciation Depreciation	151200000
CY2020	us-gaap	Depreciation Depreciation	145100000
CY2019	us-gaap	Depreciation Depreciation	140400000
CY2021	us-gaap	Adjustment For Amortization AdjustmentForAmortization	415100000
CY2020	us-gaap	Adjustment For Amortization AdjustmentForAmortization	417300000
CY2019	us-gaap	Adjustment For Amortization AdjustmentForAmortization	334000000.0
CY2021	ajg	Change In Estimated Acquisition Earnout Payables ChangeInEstimatedAcquisitionEarnoutPayables	119600000
CY2020	ajg	Change In Estimated Acquisition Earnout Payables ChangeInEstimatedAcquisitionEarnoutPayables	-32900000
CY2019	ajg	Change In Estimated Acquisition Earnout Payables ChangeInEstimatedAcquisitionEarnoutPayables	15300000
CY2021	us-gaap	Costs And Expenses CostsAndExpenses	7234300000
CY2020	us-gaap	Costs And Expenses CostsAndExpenses	6132700000
CY2019	us-gaap	Costs And Expenses CostsAndExpenses	6568900000
CY2021	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	975100000
CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	870900000
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	626100000
CY2020	us-gaap	Profit Loss ProfitLoss	858100000
CY2021	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	20100000
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	12800000
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-89700000
CY2021	us-gaap	Profit Loss ProfitLoss	955000000.0
CY2020	us-gaap	Profit Loss ProfitLoss	858100000
CY2019	us-gaap	Profit Loss ProfitLoss	715800000
CY2021	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	48200000
CY2020	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	39300000
CY2019	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	47000000.0
CY2021	us-gaap	Net Income Loss NetIncomeLoss	906800000
CY2020	us-gaap	Net Income Loss NetIncomeLoss	818800000
CY2019	us-gaap	Net Income Loss NetIncomeLoss	668800000
CY2021	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	4.47
CY2020	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	4.29
CY2019	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.60
CY2021	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	4.37
CY2020	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	4.20
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	3.52
CY2021	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	1.92
CY2020	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	1.80
CY2019	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	1.72
CY2021	us-gaap	Profit Loss ProfitLoss	955000000.0
CY2019	us-gaap	Profit Loss ProfitLoss	715800000
CY2021	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-19000000.0
CY2020	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-400000
CY2019	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-4700000
CY2021	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Gain Loss Arising During Period Net Of Tax OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax	-122300000
CY2020	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Gain Loss Arising During Period Net Of Tax OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax	183700000
CY2019	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Gain Loss Arising During Period Net Of Tax OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax	44200000
CY2021	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax Parent OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent	20800000
CY2020	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax Parent OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent	-68100000
CY2019	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax Parent OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent	-22700000
CY2021	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	872500000
CY2020	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	974100000
CY2019	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	742000000.0
CY2021	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	49500000
CY2020	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	39700000
CY2019	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	47300000
CY2021	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	823000000.0
CY2020	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	934400000
CY2019	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	694700000
CY2021Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	402600000
CY2020Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	664600000
CY2021Q4	us-gaap	Restricted Cash Current RestrictedCashCurrent	4063700000
CY2020Q4	us-gaap	Restricted Cash Current RestrictedCashCurrent	2909700000
CY2021Q4	us-gaap	Premiums And Other Receivables Net PremiumsAndOtherReceivablesNet	11753100000
CY2020Q4	us-gaap	Premiums And Other Receivables Net PremiumsAndOtherReceivablesNet	6436000000.0
CY2021Q4	us-gaap	Other Assets Current OtherAssetsCurrent	1451000000.0
CY2020Q4	us-gaap	Other Assets Current OtherAssetsCurrent	1113900000
CY2021Q4	us-gaap	Assets Current AssetsCurrent	17670400000
CY2020Q4	us-gaap	Assets Current AssetsCurrent	11124200000
CY2021Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	500800000
CY2020Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	450700000
CY2021Q4	us-gaap	Deferred Income Tax Assets Net DeferredIncomeTaxAssetsNet	1228500000
CY2020Q4	us-gaap	Deferred Income Tax Assets Net DeferredIncomeTaxAssetsNet	1085800000
CY2021Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	966500000
CY2020Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	769900000
CY2021Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	358600000
CY2020Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	373900000
CY2021Q4	us-gaap	Goodwill Goodwill	8666200000
CY2020Q4	us-gaap	Goodwill Goodwill	6127000000.0
CY2021Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	3954000000.0
CY2020Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	2399900000
CY2021Q4	us-gaap	Assets Assets	33345000000.0
CY2020Q4	us-gaap	Assets Assets	22331400000
CY2021Q4	ajg	Premiums Payable To Underwriting Enterprises PremiumsPayableToUnderwritingEnterprises	13845600000
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CY2020Q4	ajg	Accrued Compensation And Other Accrued Liabilities AccruedCompensationAndOtherAccruedLiabilities	1596200000
CY2021Q4	us-gaap	Deferred Revenue Current DeferredRevenueCurrent	520900000
CY2020Q4	us-gaap	Deferred Revenue Current DeferredRevenueCurrent	475600000
CY2021Q4	ajg	Premium Financing Borrowings PremiumFinancingBorrowings	228400000
CY2020Q4	ajg	Premium Financing Borrowings PremiumFinancingBorrowings	203600000
CY2021Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	245000000.0
CY2020Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	75000000.0
CY2021Q4	us-gaap	Liabilities Current LiabilitiesCurrent	16735000000.0
CY2020Q4	us-gaap	Liabilities Current LiabilitiesCurrent	10135000000.0
CY2021Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	5810200000
CY2020Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	4266000000.0
CY2021Q4	us-gaap	Deferred Revenue Noncurrent DeferredRevenueNoncurrent	58700000
CY2020Q4	us-gaap	Deferred Revenue Noncurrent DeferredRevenueNoncurrent	65700000
CY2021Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	309300000
CY2020Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	320900000
CY2021Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	1871700000
CY2020Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	1311100000
CY2021Q4	us-gaap	Liabilities Liabilities	24784900000
CY2020Q4	us-gaap	Liabilities Liabilities	16098700000
CY2021Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	400000000.0
CY2020Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	400000000.0
CY2021Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	208500000
CY2021Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	208500000
CY2020Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	193700000
CY2020Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	193700000
CY2021Q4	us-gaap	Common Stock Value CommonStockValue	208500000
CY2020Q4	us-gaap	Common Stock Value CommonStockValue	193700000
CY2021Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	6143700000
CY2020Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	4264400000
CY2021Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	2882300000
CY2020Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	2371700000
CY2021Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-726100000
CY2020Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-643600000
CY2021Q4	us-gaap	Stockholders Equity StockholdersEquity	8508400000
CY2020Q4	us-gaap	Stockholders Equity StockholdersEquity	6186200000
CY2021Q4	us-gaap	Minority Interest MinorityInterest	51700000
CY2020Q4	us-gaap	Minority Interest MinorityInterest	46500000
CY2021Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	8560100000
CY2020	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	111900000
CY2019	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	101200000
CY2021	us-gaap	Payments To Minority Shareholders PaymentsToMinorityShareholders	39100000
CY2020	us-gaap	Payments To Minority Shareholders PaymentsToMinorityShareholders	84400000
CY2020Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	6232700000
CY2021Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	33345000000.0
CY2020Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	22331400000
CY2021	us-gaap	Profit Loss ProfitLoss	955000000.0
CY2020	us-gaap	Profit Loss ProfitLoss	858100000
CY2019	us-gaap	Profit Loss ProfitLoss	715800000
CY2021	us-gaap	Gain Loss On Investments GainLossOnInvestments	17000000.0
CY2020	us-gaap	Gain Loss On Investments GainLossOnInvestments	-6300000
CY2019	us-gaap	Gain Loss On Investments GainLossOnInvestments	72000000.0
CY2021	ajg	Gains Losses On Extinguishment Of Debt Related To Operating Activities GainsLossesOnExtinguishmentOfDebtRelatedToOperatingActivities	-9700000
CY2021	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	566300000
CY2020	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	562400000
CY2019	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	474400000
CY2021	ajg	Change In Estimated Acquisition Earnout Payables ChangeInEstimatedAcquisitionEarnoutPayables	119600000
CY2020	ajg	Change In Estimated Acquisition Earnout Payables ChangeInEstimatedAcquisitionEarnoutPayables	-32900000
CY2019	ajg	Change In Estimated Acquisition Earnout Payables ChangeInEstimatedAcquisitionEarnoutPayables	15300000
CY2021	ajg	Amortization Of Deferred Compensation And Restricted Stock AmortizationOfDeferredCompensationAndRestrictedStock	68900000
CY2020	ajg	Amortization Of Deferred Compensation And Restricted Stock AmortizationOfDeferredCompensationAndRestrictedStock	60900000
CY2019	ajg	Amortization Of Deferred Compensation And Restricted Stock AmortizationOfDeferredCompensationAndRestrictedStock	47200000
CY2021	us-gaap	Share Based Compensation ShareBasedCompensation	13400000
CY2020	us-gaap	Share Based Compensation ShareBasedCompensation	13600000
CY2019	us-gaap	Share Based Compensation ShareBasedCompensation	14000000.0
CY2021	us-gaap	Business Combination Contingent Consideration Arrangements Change In Amount Of Contingent Consideration Liability1 BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1	-29600000
CY2020	us-gaap	Business Combination Contingent Consideration Arrangements Change In Amount Of Contingent Consideration Liability1 BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1	-14500000
CY2019	us-gaap	Business Combination Contingent Consideration Arrangements Change In Amount Of Contingent Consideration Liability1 BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1	-16600000
CY2021	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-184000000.0
CY2020	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-162000000.0
CY2019	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-171200000
CY2021	us-gaap	Foreign Currency Transaction Gain Loss Unrealized ForeignCurrencyTransactionGainLossUnrealized	-2300000
CY2020	us-gaap	Foreign Currency Transaction Gain Loss Unrealized ForeignCurrencyTransactionGainLossUnrealized	-2900000
CY2019	us-gaap	Foreign Currency Transaction Gain Loss Unrealized ForeignCurrencyTransactionGainLossUnrealized	-6700000
CY2021	ajg	Increase Decrease In Premiums And Fee Receivable IncreaseDecreaseInPremiumsAndFeeReceivable	-132900000
CY2020	ajg	Increase Decrease In Premiums And Fee Receivable IncreaseDecreaseInPremiumsAndFeeReceivable	796500000
CY2019	ajg	Increase Decrease In Premiums And Fee Receivable IncreaseDecreaseInPremiumsAndFeeReceivable	434700000
CY2021	us-gaap	Increase Decrease In Contract With Customer Liability IncreaseDecreaseInContractWithCustomerLiability	23100000
CY2020	us-gaap	Increase Decrease In Contract With Customer Liability IncreaseDecreaseInContractWithCustomerLiability	18500000
CY2019	us-gaap	Increase Decrease In Contract With Customer Liability IncreaseDecreaseInContractWithCustomerLiability	12800000
CY2021	us-gaap	Increase Decrease In Reinsurance Payables IncreaseDecreaseInReinsurancePayables	35500000
CY2020	us-gaap	Increase Decrease In Reinsurance Payables IncreaseDecreaseInReinsurancePayables	1154200000
CY2019	us-gaap	Increase Decrease In Reinsurance Payables IncreaseDecreaseInReinsurancePayables	461600000
CY2021	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	136800000
CY2020	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	22500000
CY2019	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	-11400000
CY2021	ajg	Net Change In Accrued Compensation And Other Accrued Liabilities NetChangeInAccruedCompensationAndOtherAccruedLiabilities	-222300000
CY2020	ajg	Net Change In Accrued Compensation And Other Accrued Liabilities NetChangeInAccruedCompensationAndOtherAccruedLiabilities	-91800000
CY2019	ajg	Net Change In Accrued Compensation And Other Accrued Liabilities NetChangeInAccruedCompensationAndOtherAccruedLiabilities	-77000000.0
CY2021	us-gaap	Increase Decrease In Accrued Income Taxes Payable IncreaseDecreaseInAccruedIncomeTaxesPayable	-123800000
CY2020	us-gaap	Increase Decrease In Accrued Income Taxes Payable IncreaseDecreaseInAccruedIncomeTaxesPayable	51800000
CY2019	us-gaap	Increase Decrease In Accrued Income Taxes Payable IncreaseDecreaseInAccruedIncomeTaxesPayable	35500000
CY2021	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	-46300000
CY2020	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	-15000000.0
CY2019	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	-13900000
CY2021	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	1704100000
CY2020	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	1807100000
CY2019	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	1191100000
CY2021	us-gaap	Payments For Capital Improvements PaymentsForCapitalImprovements	128600000
CY2020	us-gaap	Payments For Capital Improvements PaymentsForCapitalImprovements	99300000
CY2019	us-gaap	Payments For Capital Improvements PaymentsForCapitalImprovements	138800000
CY2021	ajg	Payments To Acquire Businesses Net Of Cash And Restricted Cash Acquired PaymentsToAcquireBusinessesNetOfCashAndRestrictedCashAcquired	3250900000
CY2020	ajg	Payments To Acquire Businesses Net Of Cash And Restricted Cash Acquired PaymentsToAcquireBusinessesNetOfCashAndRestrictedCashAcquired	324300000
CY2019	ajg	Payments To Acquire Businesses Net Of Cash And Restricted Cash Acquired PaymentsToAcquireBusinessesNetOfCashAndRestrictedCashAcquired	1266800000
CY2021	ajg	Net Proceeds From Sales Of Operations NetProceedsFromSalesOfOperations	15700000
CY2020	ajg	Net Proceeds From Sales Of Operations NetProceedsFromSalesOfOperations	8200000
CY2019	ajg	Net Proceeds From Sales Of Operations NetProceedsFromSalesOfOperations	81000000.0
CY2021	us-gaap	Payments For Proceeds From Investments PaymentsForProceedsFromInvestments	1100000
CY2020	us-gaap	Payments For Proceeds From Investments PaymentsForProceedsFromInvestments	1400000
CY2019	us-gaap	Payments For Proceeds From Investments PaymentsForProceedsFromInvestments	52000000.0
CY2021	us-gaap	Payments For Proceeds From Loans Receivable PaymentsForProceedsFromLoansReceivable	66800000
CY2020	us-gaap	Payments For Proceeds From Loans Receivable PaymentsForProceedsFromLoansReceivable	54600000
CY2019	us-gaap	Payments For Proceeds From Loans Receivable PaymentsForProceedsFromLoansReceivable	71900000
CY2019	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-1448500000
CY2020	ajg	Earnout Payments For Acquisitions EarnoutPaymentsForAcquisitions	38800000
CY2019	ajg	Earnout Payments For Acquisitions EarnoutPaymentsForAcquisitions	46300000
CY2021	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	1546700000
CY2019	us-gaap	Payments To Minority Shareholders PaymentsToMinorityShareholders	75400000
CY2021	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	392000000.0
CY2020	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	347400000
CY2019	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	321100000
CY2021	ajg	Net Borrowings Payments On Premium Financing Debt Facility NetBorrowingsPaymentsOnPremiumFinancingDebtFacility	-37000000.0
CY2020	ajg	Net Borrowings Payments On Premium Financing Debt Facility NetBorrowingsPaymentsOnPremiumFinancingDebtFacility	-16000000.0
CY2019	ajg	Net Borrowings Payments On Premium Financing Debt Facility NetBorrowingsPaymentsOnPremiumFinancingDebtFacility	-19200000
CY2021	us-gaap	Proceeds From Lines Of Credit ProceedsFromLinesOfCredit	1280000000.0
CY2020	us-gaap	Proceeds From Lines Of Credit ProceedsFromLinesOfCredit	2630000000.0
CY2019	us-gaap	Proceeds From Lines Of Credit ProceedsFromLinesOfCredit	4315000000.0
CY2021	us-gaap	Repayments Of Lines Of Credit RepaymentsOfLinesOfCredit	1235000000.0
CY2020	us-gaap	Repayments Of Lines Of Credit RepaymentsOfLinesOfCredit	3150000000.0
CY2019	us-gaap	Repayments Of Lines Of Credit RepaymentsOfLinesOfCredit	4060000000.0
CY2021	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	1677000000.0
CY2020	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	424900000
CY2019	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	725000000.0
CY2021	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	21300000
CY2020	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	1300000
CY2019	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	3900000
CY2021	ajg	Payments For Proceeds From Settlements Of Terminated Interest Rate Swaps PaymentsForProceedsFromSettlementsOfTerminatedInterestRateSwaps	31900000
CY2020	ajg	Payments For Proceeds From Settlements Of Terminated Interest Rate Swaps PaymentsForProceedsFromSettlementsOfTerminatedInterestRateSwaps	66000000.0
CY2019	ajg	Payments For Proceeds From Settlements Of Terminated Interest Rate Swaps PaymentsForProceedsFromSettlementsOfTerminatedInterestRateSwaps	15300000
CY2021	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	2684100000
CY2020	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-505100000
CY2019	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	638400000
CY2021	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	-64500000
CY2020	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	119800000
CY2019	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	6100000
CY2021	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	892000000.0
CY2020	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	950400000
CY2019	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	387100000
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	3574300000
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	2623900000
CY2019	ajg	Stock Issued During Period Value Deferred Compensation And Restricted Stock Expense Benefit StockIssuedDuringPeriodValueDeferredCompensationAndRestrictedStockExpenseBenefit	4700000
CY2019	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	323900000
CY2019Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	5215500000
CY2020	ajg	Stock Issued During Period Value Deferred Compensation And Restricted Stock Expense Benefit StockIssuedDuringPeriodValueDeferredCompensationAndRestrictedStockExpenseBenefit	9700000
CY2021	us-gaap	Stock Issued During Period Value Employee Benefit Plan StockIssuedDuringPeriodValueEmployeeBenefitPlan	71400000
CY2021	ajg	Stock Issued During Period Value Deferred Compensation And Restricted Stock Expense Benefit StockIssuedDuringPeriodValueDeferredCompensationAndRestrictedStockExpenseBenefit	6900000
CY2021	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	1437900000
CY2021	ajg	Adjustments To Additional Paid In Capital Other Compensation Expense AdjustmentsToAdditionalPaidInCapitalOtherCompensationExpense	-300000
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	2236800000
CY2021Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	4466300000
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	3574300000
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	2623900000
CY2018Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	4569700000
CY2019	us-gaap	Profit Loss ProfitLoss	715800000
CY2019	ajg	Minority Interest Increase Decrease From Redemptions MinorityInterestIncreaseDecreaseFromRedemptions	-15100000
CY2019	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	43000000.0
CY2019	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-4700000
CY2019	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	44500000
CY2019	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax Parent OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent	-22700000
CY2019	us-gaap	Stock Granted During Period Value Sharebased Compensation StockGrantedDuringPeriodValueSharebasedCompensation	14000000.0
CY2019	us-gaap	Stock Issued During Period Value Acquisitions StockIssuedDuringPeriodValueAcquisitions	168000000.0
CY2019	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	73700000
CY2019	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	27500000
CY2021	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	396200000
CY2021Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	8560100000
CY2021	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	3
CY2021Q4	ajg	Number Of Commercial Clean Coal Production Facilities NumberOfCommercialCleanCoalProductionFacilities	35
CY2021	ajg	Number Of Countries In Which Company Has Operations NumberOfCountriesInWhichCompanyHasOperations	68
CY2021	ajg	Number Of Countries In Which Company Does Business Through Network Of Correspondent Brokers And Consultants NumberOfCountriesInWhichCompanyDoesBusinessThroughNetworkOfCorrespondentBrokersAndConsultants	150
CY2021Q4	us-gaap	Equity Method Investment Ownership Percentage EquityMethodInvestmentOwnershipPercentage	0.50
CY2021	us-gaap	Variable Interest Entity Ownership Percentage VariableInterestEntityOwnershipPercentage	0.50
CY2021	us-gaap	Use Of Estimates UseOfEstimates	<p style="text-align:left;margin-bottom:0pt;margin-top:18pt;text-indent:0%;font-weight:bold;font-size:10pt;font-family:Times New Roman;font-style:normal;text-transform:none;font-variant: normal;">Use of Estimates</p> <p style="text-align:left;margin-bottom:0pt;margin-top:6pt;text-indent:0%;font-size:10pt;font-family:Times New Roman;font-weight:normal;font-style:normal;text-transform:none;font-variant: normal;">The preparation of our consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. These accounting principles require us to make estimates and assumptions that affect the reported amounts of assets and liabilities and revenues and expenses, and the disclosure of contingent assets and liabilities at the date of our consolidated financial statements. We periodically evaluate our estimates and assumptions, including those relating to the valuation of goodwill and other intangible assets, right-of-use assets, investments (including our IRC Section 45 investments), income taxes, revenue recognition, deferred costs, stock-based compensation, claims handling obligations, retirement plans, litigation and contingencies. We base our estimates on historical experience and various assumptions that we believe to be reasonable based on specific circumstances. Such estimates and assumptions could change in the future as more information becomes known, which could impact the amounts reported and disclosed herein.</p>
CY2021	ajg	Description Of Contracts Renewal Period DescriptionOfContractsRenewalPeriod	one year or less
CY2021	ajg	Percentage Of Commissions And Fee Revenues Recognized On Effective Date Of Insurance Contract PercentageOfCommissionsAndFeeRevenuesRecognizedOnEffectiveDateOfInsuranceContract	0.80
CY2021	ajg	Percentage Of Commissions And Fee Revenues Recognized In First Three Months Of Insurance Contract PercentageOfCommissionsAndFeeRevenuesRecognizedInFirstThreeMonthsOfInsuranceContract	0.15
CY2021	ajg	Percentage Of Commissions And Fee Revenues Recognized After First Three Months Of Insurance Contract PercentageOfCommissionsAndFeeRevenuesRecognizedAfterFirstThreeMonthsOfInsuranceContract	0.05
CY2021	ajg	Allowances For Estimated Policy Cancellations AllowancesForEstimatedPolicyCancellations	10000000.0
CY2020	ajg	Allowances For Estimated Policy Cancellations AllowancesForEstimatedPolicyCancellations	9900000
CY2021Q4	us-gaap	Allowance For Doubtful Accounts Receivable AllowanceForDoubtfulAccountsReceivable	8300000
CY2020Q4	us-gaap	Allowance For Doubtful Accounts Receivable AllowanceForDoubtfulAccountsReceivable	10100000
CY2021	ajg	Insurance Contracts Premium Financing Terms InsuranceContractsPremiumFinancingTerms	premium financing contracts are structured to minimize potential bad debt expense to us. Such receivables are generally considered delinquent after seven days of the payment due date. In normal course, insurance policies are cancelled within one month of the contractual payment due date if the payment remains delinquent.
CY2021Q4	us-gaap	Accounts Receivable Billed For Long Term Contracts Or Programs AccountsReceivableBilledForLongTermContractsOrPrograms	509700000
CY2020Q4	us-gaap	Accounts Receivable Billed For Long Term Contracts Or Programs AccountsReceivableBilledForLongTermContractsOrPrograms	442700000
CY2021Q4	us-gaap	Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Liabilities BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities	6553600000
CY2019	us-gaap	Impairment Of Intangible Assets Finitelived ImpairmentOfIntangibleAssetsFinitelived	100000
CY2021Q4	us-gaap	Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Net BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet	4671500000
CY2021	us-gaap	Impairment Of Intangible Assets Finitelived ImpairmentOfIntangibleAssetsFinitelived	17600000
CY2020	us-gaap	Impairment Of Intangible Assets Finitelived ImpairmentOfIntangibleAssetsFinitelived	51700000
CY2021	ajg	Business Combination Aggregate Earnout Obligation Maximum BusinessCombinationAggregateEarnoutObligationMaximum	1873900000
CY2021Q2	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	1437900000
CY2021Q4	us-gaap	Proceeds From Issuance Of Senior Long Term Debt ProceedsFromIssuanceOfSeniorLongTermDebt	750000000
CY2021	us-gaap	Business Combination Separately Recognized Transactions Additional Disclosures Acquisition Cost Expensed BusinessCombinationSeparatelyRecognizedTransactionsAdditionalDisclosuresAcquisitionCostExpensed	35700000
CY2020	us-gaap	Business Combination Separately Recognized Transactions Additional Disclosures Acquisition Cost Expensed BusinessCombinationSeparatelyRecognizedTransactionsAdditionalDisclosuresAcquisitionCostExpensed	32500000
CY2019	us-gaap	Business Combination Separately Recognized Transactions Additional Disclosures Acquisition Cost Expensed BusinessCombinationSeparatelyRecognizedTransactionsAdditionalDisclosuresAcquisitionCostExpensed	27000000.0
CY2021	us-gaap	Business Acquisitions Pro Forma Net Income Loss BusinessAcquisitionsProFormaNetIncomeLoss	-83900000
CY2020	us-gaap	Business Acquisitions Pro Forma Net Income Loss BusinessAcquisitionsProFormaNetIncomeLoss	65400000
CY2019	us-gaap	Business Acquisitions Pro Forma Net Income Loss BusinessAcquisitionsProFormaNetIncomeLoss	11700000
CY2021	us-gaap	Number Of Businesses Acquired NumberOfBusinessesAcquired	99
CY2020	us-gaap	Number Of Businesses Acquired NumberOfBusinessesAcquired	135
CY2019	us-gaap	Number Of Businesses Acquired NumberOfBusinessesAcquired	116
CY2021	ajg	Business Combination Aggregate Earnout Obligation Recorded Maximum BusinessCombinationAggregateEarnoutObligationRecordedMaximum	988500000
CY2021Q4	ajg	Business Combination Aggregate Earnout Obligation Expected Settlement In Cash Or Stock At Option BusinessCombinationAggregateEarnoutObligationExpectedSettlementInCashOrStockAtOption	670300000
CY2021Q4	ajg	Business Combination Aggregate Earnout Obligation Expected Settlement In Cash BusinessCombinationAggregateEarnoutObligationExpectedSettlementInCash	318200000
CY2020	ajg	Business Combination Aggregate Earnout Obligation Maximum BusinessCombinationAggregateEarnoutObligationMaximum	1128100000
CY2020	ajg	Business Combination Aggregate Earnout Obligation Recorded Maximum BusinessCombinationAggregateEarnoutObligationRecordedMaximum	592200000
CY2020Q4	ajg	Business Combination Aggregate Earnout Obligation Expected Settlement In Cash Or Stock At Option BusinessCombinationAggregateEarnoutObligationExpectedSettlementInCashOrStockAtOption	493700000
CY2020Q4	ajg	Business Combination Aggregate Earnout Obligation Expected Settlement In Cash BusinessCombinationAggregateEarnoutObligationExpectedSettlementInCash	98500000
CY2021Q4	ajg	Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Cash And Equivalents And Restricted Cash BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalentsAndRestrictedCash	840100000
CY2021Q4	us-gaap	Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Current Assets Receivables BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables	5619300000
CY2021Q4	us-gaap	Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Current Assets Other BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsOther	67100000
CY2021Q4	us-gaap	Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Property Plant And Equipment BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment	63600000
CY2021Q4	us-gaap	Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Noncurrent Assets BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentAssets	33200000
CY2021Q4	ajg	Business Acquisitions Purchase Price Allocation Goodwill Amount BusinessAcquisitionsPurchasePriceAllocationGoodwillAmount	2561500000
CY2021Q4	ajg	Expiration Lists ExpirationLists	2027800000
CY2021Q4	us-gaap	Finite Lived Noncompete Agreements Gross FiniteLivedNoncompeteAgreementsGross	7300000
CY2021Q4	us-gaap	Finite Lived Trade Names Gross FiniteLivedTradeNamesGross	5200000
CY2021Q4	us-gaap	Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Assets BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets	11225100000
CY2021Q4	us-gaap	Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Current Liabilities Accounts Payable BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable	6154700000
CY2021Q4	us-gaap	Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Current Liabilities BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilities	247500000
CY2021Q4	us-gaap	Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Noncurrent Liabilities BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilities	151400000
CY2020	us-gaap	Business Acquisition Pro Forma Earnings Per Share Basic BusinessAcquisitionProFormaEarningsPerShareBasic	4.36
CY2021	us-gaap	Business Acquisition Pro Forma Earnings Per Share Diluted BusinessAcquisitionProFormaEarningsPerShareDiluted	4.74
CY2020	us-gaap	Business Acquisition Pro Forma Earnings Per Share Diluted BusinessAcquisitionProFormaEarningsPerShareDiluted	4.27
CY2021	us-gaap	Business Acquisitions Pro Forma Revenue BusinessAcquisitionsProFormaRevenue	9065500000
CY2020	us-gaap	Business Acquisitions Pro Forma Revenue BusinessAcquisitionsProFormaRevenue	7979400000
CY2021	ajg	Business Acquisitions Pro Forma Net Income Loss To Controlling Interest BusinessAcquisitionsProFormaNetIncomeLossToControllingInterest	1004200000
CY2020	ajg	Business Acquisitions Pro Forma Net Income Loss To Controlling Interest BusinessAcquisitionsProFormaNetIncomeLossToControllingInterest	881800000
CY2021	us-gaap	Business Acquisition Pro Forma Earnings Per Share Basic BusinessAcquisitionProFormaEarningsPerShareBasic	4.84
CY2021Q4	us-gaap	Unbilled Contracts Receivable UnbilledContractsReceivable	730000000.0
CY2020Q4	us-gaap	Unbilled Contracts Receivable UnbilledContractsReceivable	603100000
CY2020Q4	us-gaap	Capitalized Contract Cost Net CapitalizedContractCostNet	102000000.0
CY2021Q4	us-gaap	Contract With Customer Liability ContractWithCustomerLiability	579600000
CY2020Q4	us-gaap	Contract With Customer Liability ContractWithCustomerLiability	541300000
CY2019Q4	us-gaap	Contract With Customer Liability ContractWithCustomerLiability	503800000
CY2020	ajg	Contract With Customer Liability Additions ContractWithCustomerLiabilityAdditions	374000000.0
CY2020	us-gaap	Contract With Customer Liability Revenue Recognized ContractWithCustomerLiabilityRevenueRecognized	382300000
CY2020	ajg	Net Change In Collected Billings And Deposits Received From Customers NetChangeInCollectedBillingsAndDepositsReceivedFromCustomers	25600000
CY2020	ajg	Contract With Customer Impact Of Change In Foreign Exchange Rates ContractWithCustomerImpactOfChangeInForeignExchangeRates	10300000
CY2020	us-gaap	Contract With Customer Liability Increase Decrease For Contract Acquired In Business Combination ContractWithCustomerLiabilityIncreaseDecreaseForContractAcquiredInBusinessCombination	9900000
CY2020Q4	us-gaap	Contract With Customer Liability ContractWithCustomerLiability	541300000
CY2021	ajg	Contract With Customer Liability Additions ContractWithCustomerLiabilityAdditions	427100000
CY2021	us-gaap	Contract With Customer Liability Revenue Recognized ContractWithCustomerLiabilityRevenueRecognized	399600000
CY2021	ajg	Net Change In Collected Billings And Deposits Received From Customers NetChangeInCollectedBillingsAndDepositsReceivedFromCustomers	-4300000
CY2021	ajg	Contract With Customer Impact Of Change In Foreign Exchange Rates ContractWithCustomerImpactOfChangeInForeignExchangeRates	-4500000
CY2021	us-gaap	Contract With Customer Liability Increase Decrease For Contract Acquired In Business Combination ContractWithCustomerLiabilityIncreaseDecreaseForContractAcquiredInBusinessCombination	19600000
CY2021Q4	us-gaap	Contract With Customer Liability ContractWithCustomerLiability	579600000
CY2021Q4	us-gaap	Revenue Remaining Performance Obligation RevenueRemainingPerformanceObligation	579600000
CY2021Q4	us-gaap	Revenue Remaining Performance Obligation RevenueRemainingPerformanceObligation	491800000
CY2021Q4	us-gaap	Revenue Remaining Performance Obligation RevenueRemainingPerformanceObligation	53400000
CY2021Q4	us-gaap	Revenue Remaining Performance Obligation RevenueRemainingPerformanceObligation	7500000
CY2021Q4	us-gaap	Revenue Remaining Performance Obligation RevenueRemainingPerformanceObligation	4000000.0
CY2021Q4	us-gaap	Revenue Remaining Performance Obligation RevenueRemainingPerformanceObligation	8700000
CY2021Q4	us-gaap	Revenue Remaining Performance Obligation RevenueRemainingPerformanceObligation	579600000
CY2021Q4	us-gaap	Capitalized Contract Cost Net CapitalizedContractCostNet	129700000
CY2020Q4	us-gaap	Capitalized Contract Cost Net CapitalizedContractCostNet	102000000.0
CY2021Q4	us-gaap	Capitalized Contract Cost Accumulated Amortization CapitalizedContractCostAccumulatedAmortization	425500000
CY2020Q4	us-gaap	Capitalized Contract Cost Accumulated Amortization CapitalizedContractCostAccumulatedAmortization	388400000
CY2021Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	808100000
CY2021Q4	us-gaap	Accounts Receivable Billed For Long Term Contracts Or Programs AccountsReceivableBilledForLongTermContractsOrPrograms	509700000
CY2020Q4	us-gaap	Accounts Receivable Billed For Long Term Contracts Or Programs AccountsReceivableBilledForLongTermContractsOrPrograms	442700000
CY2021Q4	ajg	Accrued Supplemental Direct Bill And Other Receivables Current AccruedSupplementalDirectBillAndOtherReceivablesCurrent	563000000.0
CY2020Q4	ajg	Accrued Supplemental Direct Bill And Other Receivables Current AccruedSupplementalDirectBillAndOtherReceivablesCurrent	361700000
CY2021Q4	ajg	Refined Coal Production Related Receivables Current RefinedCoalProductionRelatedReceivablesCurrent	76900000
CY2020Q4	ajg	Refined Coal Production Related Receivables Current RefinedCoalProductionRelatedReceivablesCurrent	95400000
CY2021Q4	us-gaap	Capitalized Contract Cost Net CapitalizedContractCostNet	129700000
CY2020Q4	us-gaap	Capitalized Contract Cost Net CapitalizedContractCostNet	102000000.0
CY2021Q4	us-gaap	Prepaid Expense Current PrepaidExpenseCurrent	171700000
CY2020Q4	us-gaap	Prepaid Expense Current PrepaidExpenseCurrent	112100000
CY2021Q4	us-gaap	Other Assets Current OtherAssetsCurrent	1451000000.0
CY2020Q4	us-gaap	Other Assets Current OtherAssetsCurrent	1113900000
CY2021Q4	us-gaap	Machinery And Equipment Gross MachineryAndEquipmentGross	36200000
CY2020Q4	us-gaap	Machinery And Equipment Gross MachineryAndEquipmentGross	33000000.0
CY2021Q4	us-gaap	Furniture And Fixtures Gross FurnitureAndFixturesGross	137100000
CY2020Q4	us-gaap	Furniture And Fixtures Gross FurnitureAndFixturesGross	138300000
CY2021Q4	us-gaap	Leasehold Improvements Gross LeaseholdImprovementsGross	170800000
CY2020Q4	us-gaap	Leasehold Improvements Gross LeaseholdImprovementsGross	166000000.0
CY2021Q4	ajg	Computer Equipment Gross ComputerEquipmentGross	247100000
CY2020Q4	ajg	Computer Equipment Gross ComputerEquipmentGross	214200000
CY2021Q4	ajg	Land And Buildings Gross LandAndBuildingsGross	145300000
CY2020Q4	ajg	Land And Buildings Gross LandAndBuildingsGross	145100000
CY2021Q4	us-gaap	Capitalized Computer Software Gross CapitalizedComputerSoftwareGross	532200000
CY2020Q4	us-gaap	Capitalized Computer Software Gross CapitalizedComputerSoftwareGross	452200000
CY2021Q4	us-gaap	Property Plant And Equipment Other PropertyPlantAndEquipmentOther	17200000
CY2020Q4	us-gaap	Property Plant And Equipment Other PropertyPlantAndEquipmentOther	16700000
CY2021Q4	us-gaap	Construction In Progress Gross ConstructionInProgressGross	23000000.0
CY2020Q4	us-gaap	Construction In Progress Gross ConstructionInProgressGross	14100000
CY2021Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	1308900000
CY2020Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	1179600000
CY2020Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	728900000
CY2021Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	500800000
CY2020Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	450700000
CY2021	us-gaap	Goodwill Written Off Related To Sale Of Business Unit GoodwillWrittenOffRelatedToSaleOfBusinessUnit	1000000.0
CY2021	us-gaap	Goodwill Translation And Purchase Accounting Adjustments GoodwillTranslationAndPurchaseAccountingAdjustments	-72100000
CY2021Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Four FiniteLivedIntangibleAssetsAmortizationExpenseYearFour	385600000
CY2021Q4	us-gaap	Goodwill Goodwill	8666200000
CY2021Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	3954000000.0
CY2020Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	2399900000
CY2021Q4	us-gaap	Goodwill Goodwill	8666200000
CY2020Q4	us-gaap	Goodwill Goodwill	6127000000.0
CY2019Q4	us-gaap	Goodwill Goodwill	5618500000
CY2020	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	359600000
CY2020	us-gaap	Goodwill Purchase Accounting Adjustments GoodwillPurchaseAccountingAdjustments	31500000
CY2020	us-gaap	Goodwill Translation And Purchase Accounting Adjustments GoodwillTranslationAndPurchaseAccountingAdjustments	117400000
CY2020Q4	us-gaap	Goodwill Goodwill	6127000000.0
CY2021	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	2561500000
CY2021	us-gaap	Goodwill Purchase Accounting Adjustments GoodwillPurchaseAccountingAdjustments	50800000
CY2021Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Next Twelve Months FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths	486800000
CY2021Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Two FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo	461600000
CY2021Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Three FiniteLivedIntangibleAssetsAmortizationExpenseYearThree	425500000
CY2021Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Five FiniteLivedIntangibleAssetsAmortizationExpenseYearFive	346900000
CY2021Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense After Year Five FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive	1847600000
CY2021Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	3954000000.0
CY2021Q4	ajg	Debt Long Term And Short Term Combined Amount Gross DebtLongTermAndShortTermCombinedAmountGross	6321400000
CY2020Q4	ajg	Debt Long Term And Short Term Combined Amount Gross DebtLongTermAndShortTermCombinedAmountGross	4551600000
CY2021Q4	us-gaap	Unamortized Debt Issuance Expense UnamortizedDebtIssuanceExpense	22600000
CY2021Q4	us-gaap	Debt Instrument Unamortized Discount DebtInstrumentUnamortizedDiscount	15200000
CY2020Q4	us-gaap	Debt Instrument Unamortized Discount DebtInstrumentUnamortizedDiscount	7000000.0
CY2021Q4	us-gaap	Debt Longterm And Shortterm Combined Amount DebtLongtermAndShorttermCombinedAmount	6283600000
CY2020Q4	us-gaap	Debt Longterm And Shortterm Combined Amount DebtLongtermAndShorttermCombinedAmount	4544600000
CY2021	us-gaap	Net Income Loss NetIncomeLoss	906800000
CY2020	us-gaap	Net Income Loss NetIncomeLoss	818800000
CY2019	us-gaap	Net Income Loss NetIncomeLoss	668800000
CY2021	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	202700000
CY2020	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	191000000.0
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	186000000.0
CY2021	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	4600000
CY2020	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	4000000.0
CY2019	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	4100000
CY2021	ajg	Weighted Average Number Of Common And Common Equivalent Shares Outstanding WeightedAverageNumberOfCommonAndCommonEquivalentSharesOutstanding	207300000
CY2020	ajg	Weighted Average Number Of Common And Common Equivalent Shares Outstanding WeightedAverageNumberOfCommonAndCommonEquivalentSharesOutstanding	195000000.0
CY2019	ajg	Weighted Average Number Of Common And Common Equivalent Shares Outstanding WeightedAverageNumberOfCommonAndCommonEquivalentSharesOutstanding	190100000
CY2021	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	4.47
CY2020	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	4.29
CY2019	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.60
CY2021	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	4.37
CY2020	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	4.20
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	3.52
CY2021	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	1300000
CY2020	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	1000000.0
CY2019	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	1000000.0
CY2021	us-gaap	Stock Granted During Period Value Sharebased Compensation StockGrantedDuringPeriodValueSharebasedCompensation	17500000
CY2020	us-gaap	Stock Granted During Period Value Sharebased Compensation StockGrantedDuringPeriodValueSharebasedCompensation	13600000
CY2019	us-gaap	Stock Granted During Period Value Sharebased Compensation StockGrantedDuringPeriodValueSharebasedCompensation	14000000.0
CY2021Q4	ajg	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Dividend Per Share ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendPerShare	1.5
CY2020Q4	ajg	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Dividend Per Share ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendPerShare	2.1
CY2019Q4	ajg	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Dividend Per Share ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendPerShare	1.7
CY2021	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate	0.009
CY2020	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate	0.007
CY2019	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate	0.025
CY2021	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Volatility Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate	0.229
CY2020	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Volatility Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate	0.173
CY2019	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Volatility Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate	0.156
CY2020Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	7500000
CY2020Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	65.09
CY2021	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Gross ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross	1600000
CY2021	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Grants In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice	127.90
CY2021	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	1400000
CY2021	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice	49.10
CY2021	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod	200000
CY2021	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Forfeitures In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice	88.84
CY2021Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	7500000
CY2021Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	81.30
CY2021Q4	ajg	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Aggregate Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingAggregateIntrinsicValue	666300000
CY2021Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber	2100000
CY2021Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice	51.46
CY2021Q4	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Intrinsic Value1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1	242300000
CY2021Q4	ajg	Share Based Compensation Arrangement By Share Based Payment Award Options Non Vested And Expected To Vest Number Of Shares ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsNonVestedAndExpectedToVestNumberOfShares	5100000
CY2021Q4	ajg	Share Based Compensation Arrangement By Share Based Payment Award Options Nonvested And Expected To Vest Exercisable Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsNonvestedAndExpectedToVestExercisableWeightedAverageExercisePrice	91.56
CY2021Q4	ajg	Sharebased Compensation Arrangement Non Vested And Expected To Vest Outstanding Aggregate Intrinsic Value SharebasedCompensationArrangementNonVestedAndExpectedToVestOutstandingAggregateIntrinsicValue	401700000
CY2019Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	7900000
CY2019Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	56.40
CY2020	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Gross ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross	1600000
CY2020	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Grants In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice	86.17
CY2020	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	1800000
CY2020	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice	45.80
CY2020	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod	200000
CY2020	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Forfeitures In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice	65.87
CY2020Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	7500000
CY2020Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	65.09
CY2020Q4	ajg	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Aggregate Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingAggregateIntrinsicValue	437900000
CY2020Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber	1900000
CY2020Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice	47.17
CY2020Q4	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Intrinsic Value1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1	147200000
CY2020Q4	ajg	Share Based Compensation Arrangement By Share Based Payment Award Options Non Vested And Expected To Vest Number Of Shares ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsNonVestedAndExpectedToVestNumberOfShares	5300000
CY2020Q4	ajg	Share Based Compensation Arrangement By Share Based Payment Award Options Nonvested And Expected To Vest Exercisable Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsNonvestedAndExpectedToVestExercisableWeightedAverageExercisePrice	70.74
CY2020Q4	ajg	Sharebased Compensation Arrangement Non Vested And Expected To Vest Outstanding Aggregate Intrinsic Value SharebasedCompensationArrangementNonVestedAndExpectedToVestOutstandingAggregateIntrinsicValue	278100000
CY2021	ajg	Share Based Compensation Arrangement By Share Based Payment Award Options Exercised In Period Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisedInPeriodIntrinsicValue	127400000
CY2020	ajg	Share Based Compensation Arrangement By Share Based Payment Award Options Exercised In Period Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisedInPeriodIntrinsicValue	106400000
CY2019	ajg	Share Based Compensation Arrangement By Share Based Payment Award Options Exercised In Period Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisedInPeriodIntrinsicValue	77900000
CY2021Q4	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized	47100000
CY2021	ajg	Weighted Average Period WeightedAveragePeriod	P4Y
CY2021	us-gaap	Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Lower Range Limit ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit	43.71
CY2021	us-gaap	Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Upper Range Limit ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit	127.90
CY2021Q4	us-gaap	Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Number Of Outstanding Options ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions	7500000
CY2021Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	81.30
CY2021Q4	us-gaap	Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Number Of Exercisable Options ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions	2100000
CY2021Q4	us-gaap	Sharebased Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Exercisable Options Weighted Average Exercise Price1 SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1	51.46
CY2021	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 if later.
CY2021	ajg	Deferred Equity Participation Sub Plan Distributions Requisite Service Description DeferredEquityParticipationSubPlanDistributionsRequisiteServiceDescription	we annually make awards under sub-plans of the DEPP for certain production staff, which generally provide for vesting and/or distributions no sooner than five years from the date of awards, although certain awards vest and/or distribute after the earlier of fifteen years or the participant reaching age 65.
CY2021	ajg	Deferred Equity Participation Sub Plan Distributions To Key Executives Age DeferredEquityParticipationSubPlanDistributionsToKeyExecutivesAge	age 65
CY2020Q4	us-gaap	Defined Benefit Plan Benefit Obligation DefinedBenefitPlanBenefitObligation	290600000
CY2019Q4	us-gaap	Defined Benefit Plan Benefit Obligation DefinedBenefitPlanBenefitObligation	274400000
CY2021	us-gaap	Defined Benefit Plan Service Cost DefinedBenefitPlanServiceCost	500000
CY2020	us-gaap	Defined Benefit Plan Service Cost DefinedBenefitPlanServiceCost	800000
CY2021	us-gaap	Defined Benefit Plan Interest Cost DefinedBenefitPlanInterestCost	6400000
CY2021Q4	us-gaap	Defined Benefit Plan Accumulated Other Comprehensive Income Before Tax DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax	42500000
CY2020	us-gaap	Defined Benefit Plan Interest Cost DefinedBenefitPlanInterestCost	8000000.0
CY2019	us-gaap	Defined Benefit Plan Interest Cost DefinedBenefitPlanInterestCost	9800000
CY2021	us-gaap	Defined Benefit Plan Expected Return On Plan Assets DefinedBenefitPlanExpectedReturnOnPlanAssets	17700000
CY2021	us-gaap	Defined Benefit Plan Service Cost DefinedBenefitPlanServiceCost	500000
CY2020	us-gaap	Defined Benefit Plan Service Cost DefinedBenefitPlanServiceCost	800000
CY2019	us-gaap	Defined Benefit Plan Service Cost DefinedBenefitPlanServiceCost	1600000
CY2021	us-gaap	Defined Benefit Plan Interest Cost DefinedBenefitPlanInterestCost	6400000
CY2020	us-gaap	Defined Benefit Plan Interest Cost DefinedBenefitPlanInterestCost	8000000.0
CY2021	us-gaap	Defined Benefit Plan Actuarial Gain Loss DefinedBenefitPlanActuarialGainLoss	2800000
CY2020	us-gaap	Defined Benefit Plan Actuarial Gain Loss DefinedBenefitPlanActuarialGainLoss	-22600000
CY2021	us-gaap	Defined Benefit Plan Benefit Obligation Benefits Paid DefinedBenefitPlanBenefitObligationBenefitsPaid	15300000
CY2020	us-gaap	Defined Benefit Plan Benefit Obligation Benefits Paid DefinedBenefitPlanBenefitObligationBenefitsPaid	15200000
CY2021Q4	us-gaap	Defined Benefit Plan Benefit Obligation DefinedBenefitPlanBenefitObligation	279400000
CY2020Q4	us-gaap	Defined Benefit Plan Benefit Obligation DefinedBenefitPlanBenefitObligation	290600000
CY2020Q4	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets	262800000
CY2019Q4	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets	243700000
CY2021	us-gaap	Defined Benefit Plan Actual Return On Plan Assets DefinedBenefitPlanActualReturnOnPlanAssets	34800000
CY2020	us-gaap	Defined Benefit Plan Actual Return On Plan Assets DefinedBenefitPlanActualReturnOnPlanAssets	34300000
CY2021	us-gaap	Defined Benefit Plan Plan Assets Benefits Paid DefinedBenefitPlanPlanAssetsBenefitsPaid	15300000
CY2020	us-gaap	Defined Benefit Plan Plan Assets Benefits Paid DefinedBenefitPlanPlanAssetsBenefitsPaid	15200000
CY2021Q4	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets	282300000
CY2020Q4	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets	262800000
CY2021Q4	us-gaap	Defined Benefit Plan Funded Status Of Plan DefinedBenefitPlanFundedStatusOfPlan	2900000
CY2020Q4	us-gaap	Defined Benefit Plan Funded Status Of Plan DefinedBenefitPlanFundedStatusOfPlan	-27800000
CY2021Q4	ajg	Pension And Other Post Retirement Defined Benefit Plans Assets Liabilities Noncurrent PensionAndOtherPostRetirementDefinedBenefitPlansAssetsLiabilitiesNoncurrent	2900000
CY2020Q4	ajg	Pension And Other Post Retirement Defined Benefit Plans Assets Liabilities Noncurrent PensionAndOtherPostRetirementDefinedBenefitPlansAssetsLiabilitiesNoncurrent	-27800000
CY2020Q4	us-gaap	Defined Benefit Plan Accumulated Other Comprehensive Income Before Tax DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax	68300000
CY2021Q4	ajg	Defined Benefit Plan Net Amount Included In Retained Earning DefinedBenefitPlanNetAmountIncludedInRetainedEarning	45400000
CY2020Q4	ajg	Defined Benefit Plan Net Amount Included In Retained Earning DefinedBenefitPlanNetAmountIncludedInRetainedEarning	40500000
CY2020	us-gaap	Defined Benefit Plan Expected Return On Plan Assets DefinedBenefitPlanExpectedReturnOnPlanAssets	16400000
CY2019	us-gaap	Defined Benefit Plan Expected Return On Plan Assets DefinedBenefitPlanExpectedReturnOnPlanAssets	14800000
CY2021	us-gaap	Defined Benefit Plan Amortization Of Gains Losses DefinedBenefitPlanAmortizationOfGainsLosses	-5900000
CY2020	us-gaap	Defined Benefit Plan Amortization Of Gains Losses DefinedBenefitPlanAmortizationOfGainsLosses	-6200000
CY2019	us-gaap	Defined Benefit Plan Amortization Of Gains Losses DefinedBenefitPlanAmortizationOfGainsLosses	-7000000.0
CY2021	us-gaap	Defined Benefit Plan Net Periodic Benefit Cost DefinedBenefitPlanNetPeriodicBenefitCost	-4900000
CY2020	us-gaap	Defined Benefit Plan Net Periodic Benefit Cost DefinedBenefitPlanNetPeriodicBenefitCost	-1400000
CY2019	us-gaap	Defined Benefit Plan Net Periodic Benefit Cost DefinedBenefitPlanNetPeriodicBenefitCost	3600000
CY2021	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Net Unamortized Gain Loss Arising During Period Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax	19900000
CY2020	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Net Unamortized Gain Loss Arising During Period Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax	-4700000
CY2019	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Net Unamortized Gain Loss Arising During Period Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax	-800000
CY2021	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	5900000
CY2020	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	6200000
CY2019	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	7000000.0
CY2021	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax	-25800000
CY2020	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax	-1500000
CY2019	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax	-6200000
CY2021	us-gaap	Amount Recognized In Net Periodic Benefit Cost And Other Comprehensive Income Loss Before Tax AmountRecognizedInNetPeriodicBenefitCostAndOtherComprehensiveIncomeLossBeforeTax	-30700000
CY2020	us-gaap	Amount Recognized In Net Periodic Benefit Cost And Other Comprehensive Income Loss Before Tax AmountRecognizedInNetPeriodicBenefitCostAndOtherComprehensiveIncomeLossBeforeTax	-2900000
CY2019	us-gaap	Amount Recognized In Net Periodic Benefit Cost And Other Comprehensive Income Loss Before Tax AmountRecognizedInNetPeriodicBenefitCostAndOtherComprehensiveIncomeLossBeforeTax	-2600000
CY2021Q4	us-gaap	Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Discount Rate DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate	0.0250
CY2020Q4	us-gaap	Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Discount Rate DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate	0.0225
CY2021	ajg	Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Expected Long Term Return On Plan Assets DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationExpectedLongTermReturnOnPlanAssets	0.0700
CY2020	ajg	Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Expected Long Term Return On Plan Assets DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationExpectedLongTermReturnOnPlanAssets	0.0700
CY2021	us-gaap	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Discount Rate DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate	0.0225
CY2020	us-gaap	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Discount Rate DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate	0.0300
CY2019	us-gaap	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Discount Rate DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate	0.0400
CY2021	us-gaap	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Expected Long Term Return On Assets DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets	0.0700
CY2020	us-gaap	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Expected Long Term Return On Assets DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets	0.0700
CY2019	us-gaap	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Expected Long Term Return On Assets DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets	0.0700
CY2021Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Next Twelve Months DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths	16700000
CY2021Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Year Two DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo	16800000
CY2021Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Year Three DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree	17000000.0
CY2021Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Year Four DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour	17200000
CY2021Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Year Five DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive	17200000
CY2021Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Five Fiscal Years Thereafter DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter	83000000.0
CY2021Q4	us-gaap	Defined Benefit Plan Weighted Average Asset Allocations DefinedBenefitPlanWeightedAverageAssetAllocations	1.000
CY2020Q4	us-gaap	Defined Benefit Plan Weighted Average Asset Allocations DefinedBenefitPlanWeightedAverageAssetAllocations	1.000
CY2021Q4	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets	282300000
CY2020Q4	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets	262800000
CY2021	us-gaap	Defined Benefit Plan Contributions By Employer DefinedBenefitPlanContributionsByEmployer	0
CY2020	us-gaap	Defined Benefit Plan Contributions By Employer DefinedBenefitPlanContributionsByEmployer	0
CY2019	us-gaap	Defined Benefit Plan Contributions By Employer DefinedBenefitPlanContributionsByEmployer	0
CY2021	us-gaap	Defined Contribution Plan Employer Discretionary Contribution Amount DefinedContributionPlanEmployerDiscretionaryContributionAmount	0
CY2019	us-gaap	Defined Contribution Plan Employer Discretionary Contribution Amount DefinedContributionPlanEmployerDiscretionaryContributionAmount	0
CY2020	us-gaap	Defined Contribution Plan Employer Discretionary Contribution Amount DefinedContributionPlanEmployerDiscretionaryContributionAmount	0
CY2021Q4	us-gaap	Equity Method Investments EquityMethodInvestments	5500000
CY2021Q4	ajg	Equity Method Investment Summarized Financial Information Funding Commitments EquityMethodInvestmentSummarizedFinancialInformationFundingCommitments	500000
CY2020Q4	us-gaap	Equity Method Investments EquityMethodInvestments	22400000
CY2021Q4	ajg	Number Of Certified Low Income Housing Developments Investment NumberOfCertifiedLowIncomeHousingDevelopmentsInvestment	7
CY2021	us-gaap	Lease Cost LeaseCost	146800000
CY2021	ajg	Operating Leases Cash Flow Related Information OperatingLeasesCashFlowRelatedInformation	<p style="text-align:left;margin-bottom:0pt;margin-top:0pt;text-indent:0%;font-family:Times New Roman;font-size:10pt;"> </p> <div> <table border="0" cellpadding="0" cellspacing="0" style="margin:auto;border-collapse:collapse; width:100%;"> <tr> <td style="background-color:#FFFFFF;padding-left:0pt;padding-Right:0.75pt;padding-Top:0.75pt;padding-Bottom:0pt;width:73.02%;" valign="top"> <p style="margin-bottom:0pt;margin-top:0pt;margin-left:0pt;;text-indent:0pt;;;font-size:12pt;font-family:Times New Roman;font-weight:normal;font-style:normal;text-transform:none;font-variant: normal;"> </p></td> <td style="background-color:#FFFFFF;padding-left:0pt;padding-Right:0.75pt;padding-Top:0.75pt;padding-Bottom:0pt;width:2.06%;" valign="top"> <p style="margin-bottom:0pt;margin-top:0pt;margin-left:0pt;;text-indent:0pt;;font-weight:bold;color:#000000;font-size:8pt;font-family:Times New Roman;font-style:normal;text-transform:none;font-variant: normal;"> </p></td> <td colspan="2" style="background-color:#FFFFFF;padding-left:0pt;padding-Right:0.75pt;padding-Top:0.75pt;padding-Bottom:0pt;width:23.9%;" valign="bottom"> <p style="text-align:center;margin-bottom:0pt;margin-top:0pt;margin-left:0pt;;text-indent:0pt;;font-weight:bold;color:#000000;font-size:8pt;font-family:Times New Roman;font-style:normal;text-transform:none;font-variant: normal;">Year ended</p></td> <td style="background-color:#FFFFFF;padding-left:0pt;padding-Right:0.75pt;padding-Top:0.75pt;padding-Bottom:0pt;width:1%;white-space:nowrap;" valign="bottom"> <p style="margin-bottom:0pt;margin-top:0pt;margin-left:0pt;;text-indent:0pt;;font-weight:bold;color:#000000;font-size:8pt;font-family:Times New Roman;font-style:normal;text-transform:none;font-variant: normal;"> </p></td> </tr> <tr> <td style="background-color:#FFFFFF;padding-left:0pt;padding-Right:0.75pt;padding-Top:0.75pt;padding-Bottom:0pt;width:73.02%; border-bottom:solid 0.75pt #000000;" valign="top"> <p style="margin-bottom:0pt;margin-top:0pt;margin-left:0pt;;text-indent:0pt;;font-weight:bold;color:#000000;font-size:8pt;font-family:Times New Roman;font-style:normal;text-transform:none;font-variant: normal;">Supplemental Cash Flow Information Related to Leases (in millions)</p></td> <td style="background-color:#FFFFFF;padding-left:0pt;padding-Right:0.75pt;padding-Top:0.75pt;width:2.06%; border-bottom:solid 0.75pt transparent;" valign="top"> <p style="margin-bottom:0pt;margin-top:0pt;margin-left:0pt;;text-indent:0pt;;font-weight:bold;color:#000000;font-size:8pt;font-family:Times New Roman;font-style:normal;text-transform:none;font-variant: normal;"> </p></td> <td colspan="2" style="background-color:#FFFFFF;padding-left:0pt;padding-Right:0.75pt;padding-Top:0.75pt;padding-Bottom:0pt;width:23.9%; border-bottom:solid 0.75pt #000000;" valign="bottom"> <p style="text-align:center;margin-bottom:0pt;margin-top:0pt;margin-left:0pt;;text-indent:0pt;;font-weight:bold;color:#000000;font-size:8pt;font-family:Times New Roman;font-style:normal;text-transform:none;font-variant: normal;">December 31, 2021</p></td> <td style="background-color:#FFFFFF;padding-left:0pt;padding-Right:0.75pt;padding-Top:0.75pt;width:1%;white-space:nowrap;" valign="bottom"> <p style="margin-bottom:0pt;margin-top:0pt;margin-left:0pt;;text-indent:0pt;;font-weight:bold;color:#000000;font-size:8pt;font-family:Times New Roman;font-style:normal;text-transform:none;font-variant: normal;"> </p></td> </tr> <tr> <td style="background-color:#CFF0FC;padding-left:0pt;padding-Right:0.75pt;padding-Top:0.75pt;padding-Bottom:0pt;width:73.02%; border-top:solid 0.75pt #000000;" valign="top"> <p style="margin-bottom:0pt;margin-top:0pt;margin-left:0pt;;text-indent:0pt;;color:#000000;font-size:10pt;font-family:Times New Roman;font-weight:normal;font-style:normal;text-transform:none;font-variant: normal;">Cash paid for amounts included in the measurement of</p> <p style="margin-bottom:0pt;margin-top:0pt;margin-left:0pt;;text-indent:0pt;;color:#000000;font-size:10pt;font-family:Times New Roman;font-weight:normal;font-style:normal;text-transform:none;font-variant: normal;"> lease liabilities:</p></td> <td style="background-color:#CFF0FC;padding-left:0pt;padding-Right:0.75pt;padding-Top:0.75pt;padding-Bottom:0pt;width:2.06%;" valign="top"> <p style="margin-bottom:0pt;margin-top:0pt;margin-left:0pt;;text-indent:0pt;;color:#000000;font-size:10pt;font-family:Times New Roman;font-weight:normal;font-style:normal;text-transform:none;font-variant: normal;"> </p></td> <td style="background-color:#CFF0FC;padding-left:0pt;padding-Right:0.75pt;padding-Top:0.75pt;padding-Bottom:0pt;width:1%; border-top:solid 0.75pt #000000;white-space:nowrap;" valign="bottom"> <p style="margin-bottom:0pt;margin-top:0pt;margin-left:0pt;;text-indent:0pt;;color:#000000;font-size:10pt;font-family:Times New Roman;font-weight:normal;font-style:normal;text-transform:none;font-variant: normal;"> </p></td> <td style="background-color:#CFF0FC;padding-left:0pt;padding-Right:0.75pt;padding-Top:0.75pt;padding-Bottom:0pt;width:22.9%; border-top:solid 0.75pt #000000;white-space:nowrap;" valign="bottom"> <p style="margin-bottom:0pt;margin-top:0pt;margin-left:0pt;;text-indent:0pt;;color:#000000;font-size:10pt;font-family:Times New Roman;font-weight:normal;font-style:normal;text-transform:none;font-variant: normal;"> </p></td> <td style="background-color:#CFF0FC;padding-left:0pt;padding-Right:0.75pt;padding-Top:0.75pt;padding-Bottom:0pt;width:1%;white-space:nowrap;" valign="bottom"> <p style="margin-bottom:0pt;margin-top:0pt;margin-left:0pt;;text-indent:0pt;;color:#000000;font-size:10pt;font-family:Times New Roman;font-weight:normal;font-style:normal;text-transform:none;font-variant: normal;"> </p></td> </tr> <tr> <td style="background-color:#FFFFFF;padding-left:0pt;padding-Right:0.75pt;padding-Top:0.75pt;padding-Bottom:0pt;width:73.02%;" valign="top"> <p style="margin-bottom:0pt;margin-top:0pt;margin-left:13.7pt;;text-indent:0pt;;color:#000000;font-size:10pt;font-family:Times New Roman;font-weight:normal;font-style:normal;text-transform:none;font-variant: normal;">Operating cash flows from operating leases</p></td> <td style="background-color:#FFFFFF;padding-left:0pt;padding-Right:0.75pt;padding-Top:0.75pt;padding-Bottom:0pt;width:2.06%;" valign="top"> <p style="margin-bottom:0pt;margin-top:0pt;margin-left:0pt;;text-indent:0pt;;color:#000000;font-size:10pt;font-family:Times New Roman;font-weight:normal;font-style:normal;text-transform:none;font-variant: normal;"> </p></td> <td style="background-color:#FFFFFF;padding-left:0pt;padding-Right:0.75pt;padding-Top:0.75pt;padding-Bottom:0pt;width:1%;white-space:nowrap;" valign="middle"> <p style="margin-bottom:0pt;margin-top:0pt;margin-left:0pt;;text-indent:0pt;;color:#000000;font-size:10pt;font-family:Times New Roman;font-weight:normal;font-style:normal;text-transform:none;font-variant: normal;">$</p></td> <td style="background-color:#FFFFFF;padding-left:0pt;padding-Right:0.75pt;padding-Top:0.75pt;padding-Bottom:0pt;width:22.9%;white-space:nowrap;" valign="middle"> <p style="text-align:right;margin-bottom:0pt;margin-top:0pt;margin-left:0pt;;text-indent:0pt;;color:#000000;font-size:10pt;font-family:Times New Roman;font-weight:normal;font-style:normal;text-transform:none;font-variant: normal;">120.1</p></td> <td style="background-color:#FFFFFF;padding-left:0pt;padding-Right:0.75pt;padding-Top:0.75pt;padding-Bottom:0pt;width:1%;white-space:nowrap;" valign="middle"> <p style="margin-bottom:0pt;margin-top:0pt;margin-left:0pt;;text-indent:0pt;;color:#000000;font-size:10pt;font-family:Times New Roman;font-weight:normal;font-style:normal;text-transform:none;font-variant: normal;"> </p></td> </tr> <tr> <td style="background-color:#CFF0FC;padding-left:0pt;padding-Right:0.75pt;padding-Top:0.75pt;padding-Bottom:0pt;width:73.02%;" valign="top"> <p style="margin-bottom:0pt;margin-top:0pt;margin-left:0pt;;text-indent:0pt;;color:#000000;font-size:10pt;font-family:Times New Roman;font-weight:normal;font-style:normal;text-transform:none;font-variant: normal;">Right-of-use assets obtained in exchange for new</p> <p style="margin-bottom:0pt;margin-top:0pt;margin-left:0pt;;text-indent:0pt;;color:#000000;font-size:10pt;font-family:Times New Roman;font-weight:normal;font-style:normal;text-transform:none;font-variant: normal;"> operating lease liabilities</p></td> <td style="background-color:#CFF0FC;padding-left:0pt;padding-Right:0.75pt;padding-Top:0.75pt;padding-Bottom:0pt;width:2.06%;" valign="top"> <p style="margin-bottom:0pt;margin-top:0pt;margin-left:0pt;;text-indent:0pt;;color:#000000;font-size:10pt;font-family:Times New Roman;font-weight:normal;font-style:normal;text-transform:none;font-variant: normal;"> </p></td> <td style="background-color:#CFF0FC;padding-left:0pt;padding-Right:0.75pt;padding-Top:0.75pt;padding-Bottom:0pt;width:1%;white-space:nowrap;" valign="bottom"> <p style="margin-bottom:0pt;margin-top:0pt;margin-left:0pt;;text-indent:0pt;;color:#000000;font-size:10pt;font-family:Times New Roman;font-weight:normal;font-style:normal;text-transform:none;font-variant: normal;">$</p></td> <td style="background-color:#CFF0FC;padding-left:0pt;padding-Right:0.75pt;padding-Top:0.75pt;padding-Bottom:0pt;width:22.9%;white-space:nowrap;" valign="bottom"> <p style="text-align:right;margin-bottom:0pt;margin-top:0pt;margin-left:0pt;;text-indent:0pt;;color:#000000;font-size:10pt;font-family:Times New Roman;font-weight:normal;font-style:normal;text-transform:none;font-variant: normal;">87.0</p></td> <td style="background-color:#CFF0FC;padding-left:0pt;padding-Right:0.75pt;padding-Top:0.75pt;padding-Bottom:0pt;width:1%;white-space:nowrap;" valign="bottom"> <p style="margin-bottom:0pt;margin-top:0pt;margin-left:0pt;;text-indent:0pt;;color:#000000;font-size:1pt;font-family:Times New Roman;font-weight:normal;font-style:normal;text-transform:none;font-variant: normal;"> </p></td> </tr> </table></div> <p style="text-align:left;margin-bottom:0pt;margin-top:0pt;text-indent:0%;font-family:Times New Roman;font-size:10pt;"> </p>
CY2021	us-gaap	Operating Lease Payments OperatingLeasePayments	120100000
CY2021	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	87000000.0
CY2021	ajg	Number Of Employees NumberOfEmployees	2000
CY2021Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	358600000
CY2021	ajg	Operating Lease Related Assets And Liabilities And Other Related Information OperatingLeaseRelatedAssetsAndLiabilitiesAndOtherRelatedInformation	<p style="text-align:left;margin-bottom:0pt;margin-top:12pt;text-indent:0%;font-size:10pt;font-family:Times New Roman;font-weight:normal;font-style:normal;text-transform:none;font-variant: normal;">Supplemental balance sheet information related to leases is as follows (in millions, except lease term and discount rate):</p> <p style="text-align:left;margin-bottom:0pt;margin-top:0pt;text-indent:0%;font-family:Times New Roman;font-size:10pt;"> </p> <div> <table border="0" cellpadding="0" cellspacing="0" style="margin:auto;border-collapse:collapse; width:100%;"> <tr> <td style="background-color:#FFFFFF;padding-left:0pt;padding-Right:0.75pt;padding-Top:0.75pt;padding-Bottom:0pt;width:39.4%; border-bottom:solid 0.75pt #000000;" valign="bottom"> <p style="margin-bottom:0pt;margin-top:0pt;margin-left:0pt;;text-indent:0pt;;font-weight:bold;color:#000000;font-size:8pt;font-family:Times New Roman;font-style:normal;text-transform:none;font-variant: normal;">Lease Components</p></td> <td style="background-color:#FFFFFF;padding-left:0pt;padding-Right:0.75pt;padding-Top:0.75pt;width:1.9%; border-bottom:solid 0.75pt transparent;" valign="top"> <p style="margin-bottom:0pt;margin-top:0pt;margin-left:0pt;;text-indent:0pt;;font-weight:bold;color:#000000;font-size:8pt;font-family:Times New Roman;font-style:normal;text-transform:none;font-variant: normal;"> </p></td> <td style="background-color:#FFFFFF;padding-left:0pt;padding-Right:0.75pt;padding-Top:0.75pt;padding-Bottom:0pt;width:39.4%; border-bottom:solid 0.75pt #000000;" valign="bottom"> <p style="text-align:center;margin-bottom:0pt;margin-top:0pt;margin-left:0pt;;text-indent:0pt;;font-weight:bold;color:#000000;font-size:8pt;font-family:Times New Roman;font-style:normal;text-transform:none;font-variant: normal;">Balance Sheet Classification</p></td> <td style="background-color:#FFFFFF;padding-left:0pt;padding-Right:0.75pt;padding-Top:0.75pt;width:1.9%; border-bottom:solid 0.75pt transparent;" valign="top"> <p style="margin-bottom:0pt;margin-top:0pt;margin-left:0pt;;text-indent:0pt;;font-weight:bold;color:#000000;font-size:8pt;font-family:Times New Roman;font-style:normal;text-transform:none;font-variant: normal;"> </p></td> <td colspan="2" style="background-color:#FFFFFF;padding-left:0pt;padding-Right:0.75pt;padding-Top:0.75pt;padding-Bottom:0pt;width:16.34%; border-bottom:solid 0.75pt #000000;" valign="bottom"> <p style="text-align:center;margin-bottom:0pt;margin-top:0pt;margin-left:0pt;;text-indent:0pt;;font-weight:bold;color:#000000;font-size:8pt;font-family:Times New Roman;font-style:normal;text-transform:none;font-variant: normal;">December 31, 2021</p></td> <td style="background-color:#FFFFFF;padding-left:0pt;padding-Right:0.75pt;padding-Top:0.75pt;width:1%;white-space:nowrap;" valign="bottom"> <p style="margin-bottom:0pt;margin-top:0pt;margin-left:0pt;;text-indent:0pt;;font-weight:bold;color:#000000;font-size:8pt;font-family:Times New Roman;font-style:normal;text-transform:none;font-variant: normal;"> </p></td> </tr> <tr> <td style="background-color:#CFF0FC;padding-left:0pt;padding-Right:0.75pt;padding-Top:0.75pt;width:39.4%; border-top:solid 0.75pt #000000; border-bottom:double 2.5pt transparent;" valign="bottom"> <p style="margin-bottom:0pt;margin-top:0pt;margin-left:0pt;;text-indent:0pt;;color:#000000;font-size:10pt;font-family:Times New Roman;font-weight:normal;font-style:normal;text-transform:none;font-variant: normal;">Lease right-of-use assets</p></td> <td style="background-color:#CFF0FC;padding-left:0pt;padding-Right:0.75pt;padding-Top:0.75pt;width:1.9%; border-bottom:double 2.5pt transparent;" valign="top"> <p style="margin-bottom:0pt;margin-top:0pt;margin-left:0pt;;text-indent:0pt;;color:#000000;font-size:10pt;font-family:Times New Roman;font-weight:normal;font-style:normal;text-transform:none;font-variant: normal;"> </p></td> <td style="background-color:#CFF0FC;padding-left:0pt;padding-Right:0.75pt;padding-Top:0.75pt;width:39.4%; border-top:solid 0.75pt #000000; border-bottom:double 2.5pt transparent;" valign="top"> <p style="margin-bottom:0pt;margin-top:0pt;margin-left:0pt;;text-indent:0pt;;color:#000000;font-size:10pt;font-family:Times New Roman;font-weight:normal;font-style:normal;text-transform:none;font-variant: normal;">Right-of-use assets</p></td> <td style="background-color:#CFF0FC;padding-left:0pt;padding-Right:0.75pt;padding-Top:0.75pt;width:1.9%; border-bottom:double 2.5pt transparent;" valign="top"> <p style="margin-bottom:0pt;margin-top:0pt;margin-left:0pt;;text-indent:0pt;;color:#000000;font-size:10pt;font-family:Times New Roman;font-weight:normal;font-style:normal;text-transform:none;font-variant: normal;"> </p></td> <td style="background-color:#CFF0FC;padding-left:0pt;padding-Right:0.75pt;padding-Top:0.75pt;padding-Bottom:0pt;width:1%; border-top:solid 0.75pt #000000; border-bottom:double 2.5pt #000000;white-space:nowrap;" valign="bottom"> <p style="margin-bottom:0pt;margin-top:0pt;margin-left:0pt;;text-indent:0pt;;color:#000000;font-size:10pt;font-family:Times New Roman;font-weight:normal;font-style:normal;text-transform:none;font-variant: normal;">$</p></td> <td style="background-color:#CFF0FC;padding-left:0pt;padding-Right:0.75pt;padding-Top:0.75pt;padding-Bottom:0pt;width:15.34%; border-top:solid 0.75pt #000000; border-bottom:double 2.5pt #000000;white-space:nowrap;" valign="bottom"> <p style="text-align:right;margin-bottom:0pt;margin-top:0pt;margin-left:0pt;;text-indent:0pt;;color:#000000;font-size:10pt;font-family:Times New Roman;font-weight:normal;font-style:normal;text-transform:none;font-variant: normal;">358.6</p></td> <td style="background-color:#CFF0FC;padding-left:0pt;padding-Right:0.75pt;padding-Top:0.75pt;width:1%; border-bottom:double 2.5pt transparent;white-space:nowrap;" valign="bottom"> <p style="margin-bottom:0pt;margin-top:0pt;margin-left:0pt;;text-indent:0pt;;color:#000000;font-size:10pt;font-family:Times New Roman;font-weight:normal;font-style:normal;text-transform:none;font-variant: normal;"> </p></td> </tr> <tr> <td style="background-color:#FFFFFF;padding-left:0pt;padding-Right:0.75pt;padding-Top:0.75pt;padding-Bottom:0pt;width:39.4%;" valign="bottom"> <p style="margin-bottom:0pt;margin-top:0pt;margin-left:0pt;;text-indent:0pt;;color:#000000;font-size:10pt;font-family:Times New Roman;font-weight:normal;font-style:normal;text-transform:none;font-variant: normal;">Other current lease liabilities</p></td> <td style="background-color:#FFFFFF;padding-left:0pt;padding-Right:0.75pt;padding-Top:0.75pt;padding-Bottom:0pt;width:1.9%;" valign="top"> <p style="margin-bottom:0pt;margin-top:0pt;margin-left:0pt;;text-indent:0pt;;color:#000000;font-size:10pt;font-family:Times New Roman;font-weight:normal;font-style:normal;text-transform:none;font-variant: normal;"> </p></td> <td style="background-color:#FFFFFF;padding-left:0pt;padding-Right:0.75pt;padding-Top:0.75pt;padding-Bottom:0pt;width:39.4%;" valign="top"> <p style="margin-bottom:0pt;margin-top:0pt;margin-left:0pt;;text-indent:0pt;;color:#000000;font-size:10pt;font-family:Times New Roman;font-weight:normal;font-style:normal;text-transform:none;font-variant: normal;">Accrued compensation and other current liabilities</p></td> <td style="background-color:#FFFFFF;padding-left:0pt;padding-Right:0.75pt;padding-Top:0.75pt;padding-Bottom:0pt;width:1.9%;" valign="top"> <p style="margin-bottom:0pt;margin-top:0pt;margin-left:0pt;;text-indent:0pt;;color:#000000;font-size:10pt;font-family:Times New Roman;font-weight:normal;font-style:normal;text-transform:none;font-variant: normal;"> </p></td> <td style="background-color:#FFFFFF;padding-left:0pt;padding-Right:0.75pt;padding-Top:0.75pt;padding-Bottom:0pt;width:1%; border-top:double 2.5pt #000000;white-space:nowrap;" valign="bottom"> <p style="margin-bottom:0pt;margin-top:0pt;margin-left:0pt;;text-indent:0pt;;color:#000000;font-size:10pt;font-family:Times New Roman;font-weight:normal;font-style:normal;text-transform:none;font-variant: normal;"> </p></td> <td style="background-color:#FFFFFF;padding-left:0pt;padding-Right:0.75pt;padding-Top:0.75pt;padding-Bottom:0pt;width:15.34%; border-top:double 2.5pt #000000;white-space:nowrap;" valign="bottom"> <p style="text-align:right;margin-bottom:0pt;margin-top:0pt;margin-left:0pt;;text-indent:0pt;;color:#000000;font-size:10pt;font-family:Times New Roman;font-weight:normal;font-style:normal;text-transform:none;font-variant: normal;">82.7</p></td> <td style="background-color:#FFFFFF;padding-left:0pt;padding-Right:0.75pt;padding-Top:0.75pt;padding-Bottom:0pt;width:1%;white-space:nowrap;" valign="bottom"> <p style="margin-bottom:0pt;margin-top:0pt;margin-left:0pt;;text-indent:0pt;;color:#000000;font-size:10pt;font-family:Times New Roman;font-weight:normal;font-style:normal;text-transform:none;font-variant: normal;"> </p></td> </tr> <tr> <td style="background-color:#CFF0FC;padding-left:0pt;padding-Right:0.75pt;padding-Top:0.75pt;width:39.4%; border-bottom:solid 0.75pt transparent;" valign="bottom"> <p style="margin-bottom:0pt;margin-top:0pt;margin-left:0pt;;text-indent:0pt;;color:#000000;font-size:10pt;font-family:Times New Roman;font-weight:normal;font-style:normal;text-transform:none;font-variant: normal;">Lease liabilities</p></td> <td style="background-color:#CFF0FC;padding-left:0pt;padding-Right:0.75pt;padding-Top:0.75pt;width:1.9%; border-bottom:solid 0.75pt transparent;" valign="top"> <p style="margin-bottom:0pt;margin-top:0pt;margin-left:0pt;;text-indent:0pt;;color:#000000;font-size:10pt;font-family:Times New Roman;font-weight:normal;font-style:normal;text-transform:none;font-variant: normal;"> </p></td> <td style="background-color:#CFF0FC;padding-left:0pt;padding-Right:0.75pt;padding-Top:0.75pt;width:39.4%; border-bottom:solid 0.75pt transparent;" valign="top"> <p style="margin-bottom:0pt;margin-top:0pt;margin-left:0pt;;text-indent:0pt;;color:#000000;font-size:10pt;font-family:Times New Roman;font-weight:normal;font-style:normal;text-transform:none;font-variant: normal;">Lease liabilities - noncurrent</p></td> <td style="background-color:#CFF0FC;padding-left:0pt;padding-Right:0.75pt;padding-Top:0.75pt;width:1.9%; border-bottom:solid 0.75pt transparent;" valign="top"> <p style="margin-bottom:0pt;margin-top:0pt;margin-left:0pt;;text-indent:0pt;;color:#000000;font-size:10pt;font-family:Times New Roman;font-weight:normal;font-style:normal;text-transform:none;font-variant: normal;"> </p></td> <td style="background-color:#CFF0FC;padding-left:0pt;padding-Right:0.75pt;padding-Top:0.75pt;padding-Bottom:0pt;width:1%; border-bottom:solid 0.75pt #000000;white-space:nowrap;" valign="middle"> <p style="margin-bottom:0pt;margin-top:0pt;margin-left:0pt;;text-indent:0pt;;color:#000000;font-size:10pt;font-family:Times New Roman;font-weight:normal;font-style:normal;text-transform:none;font-variant: normal;"> </p></td> <td style="background-color:#CFF0FC;padding-left:0pt;padding-Right:0.75pt;padding-Top:0.75pt;padding-Bottom:0pt;width:15.34%; border-bottom:solid 0.75pt #000000;white-space:nowrap;" valign="middle"> <p style="text-align:right;margin-bottom:0pt;margin-top:0pt;margin-left:0pt;;text-indent:0pt;;color:#000000;font-size:10pt;font-family:Times New Roman;font-weight:normal;font-style:normal;text-transform:none;font-variant: normal;">309.3</p></td> <td style="background-color:#CFF0FC;padding-left:0pt;padding-Right:0.75pt;padding-Top:0.75pt;width:1%; border-bottom:solid 0.75pt transparent;white-space:nowrap;" valign="middle"> <p style="margin-bottom:0pt;margin-top:0pt;margin-left:0pt;;text-indent:0pt;;color:#000000;font-size:10pt;font-family:Times New Roman;font-weight:normal;font-style:normal;text-transform:none;font-variant: normal;"> </p></td> </tr> <tr> <td style="background-color:#FFFFFF;padding-left:0pt;padding-Right:0.75pt;padding-Top:0.75pt;width:39.4%; border-bottom:double 2.5pt transparent;" valign="bottom"> <p style="margin-bottom:0pt;margin-top:0pt;margin-left:13.7pt;;text-indent:0pt;;color:#000000;font-size:10pt;font-family:Times New Roman;font-weight:normal;font-style:normal;text-transform:none;font-variant: normal;">Total lease liabilities</p></td> <td style="background-color:#FFFFFF;padding-left:0pt;padding-Right:0.75pt;padding-Top:0.75pt;width:1.9%; border-bottom:double 2.5pt transparent;" valign="top"> <p style="margin-bottom:0pt;margin-top:0pt;margin-left:0pt;;text-indent:0pt;;color:#000000;font-size:10pt;font-family:Times New Roman;font-weight:normal;font-style:normal;text-transform:none;font-variant: normal;"> </p></td> <td style="background-color:#FFFFFF;padding-left:0pt;padding-Right:0.75pt;padding-Top:0.75pt;width:39.4%; border-bottom:double 2.5pt transparent;" valign="top"> <p style="margin-bottom:0pt;margin-top:0pt;margin-left:0pt;;text-indent:0pt;;color:#000000;font-size:10pt;font-family:Times New Roman;font-weight:normal;font-style:normal;text-transform:none;font-variant: normal;"> </p></td> <td style="background-color:#FFFFFF;padding-left:0pt;padding-Right:0.75pt;padding-Top:0.75pt;width:1.9%; border-bottom:double 2.5pt transparent;" valign="top"> <p style="margin-bottom:0pt;margin-top:0pt;margin-left:0pt;;text-indent:0pt;;color:#000000;font-size:10pt;font-family:Times New Roman;font-weight:normal;font-style:normal;text-transform:none;font-variant: normal;"> </p></td> <td style="background-color:#FFFFFF;padding-left:0pt;padding-Right:0.75pt;padding-Top:0.75pt;padding-Bottom:0pt;width:1%; border-top:solid 0.75pt #000000; border-bottom:double 2.5pt #000000;white-space:nowrap;" valign="bottom"> <p style="margin-bottom:0pt;margin-top:0pt;margin-left:0pt;;text-indent:0pt;;color:#000000;font-size:10pt;font-family:Times New Roman;font-weight:normal;font-style:normal;text-transform:none;font-variant: normal;">$</p></td> <td style="background-color:#FFFFFF;padding-left:0pt;padding-Right:0.75pt;padding-Top:0.75pt;padding-Bottom:0pt;width:15.34%; border-top:solid 0.75pt #000000; border-bottom:double 2.5pt #000000;white-space:nowrap;" valign="bottom"> <p style="text-align:right;margin-bottom:0pt;margin-top:0pt;margin-left:0pt;;text-indent:0pt;;color:#000000;font-size:10pt;font-family:Times New Roman;font-weight:normal;font-style:normal;text-transform:none;font-variant: normal;">392.0</p></td> <td style="background-color:#FFFFFF;padding-left:0pt;padding-Right:0.75pt;padding-Top:0.75pt;width:1%; border-bottom:double 2.5pt transparent;white-space:nowrap;" valign="bottom"> <p style="margin-bottom:0pt;margin-top:0pt;margin-left:0pt;;text-indent:0pt;;color:#000000;font-size:10pt;font-family:Times New Roman;font-weight:normal;font-style:normal;text-transform:none;font-variant: normal;"> </p></td> </tr> <tr> <td style="background-color:#CFF0FC;padding-left:0pt;padding-Right:0.75pt;padding-Top:0.75pt;padding-Bottom:0pt;width:39.4%;" valign="bottom"> <p style="margin-bottom:0pt;margin-top:0pt;margin-left:0pt;;text-indent:0pt;;color:#000000;font-size:10pt;font-family:Times New Roman;font-weight:normal;font-style:normal;text-transform:none;font-variant: normal;">Weighted-average remaining lease term, years</p></td> <td style="background-color:#CFF0FC;padding-left:0pt;padding-Right:0.75pt;padding-Top:0.75pt;padding-Bottom:0pt;width:1.9%;" valign="top"> <p style="margin-bottom:0pt;margin-top:0pt;margin-left:0pt;;text-indent:0pt;;color:#000000;font-size:10pt;font-family:Times New Roman;font-weight:normal;font-style:normal;text-transform:none;font-variant: normal;"> </p></td> <td style="background-color:#CFF0FC;padding-left:0pt;padding-Right:0.75pt;padding-Top:0.75pt;padding-Bottom:0pt;width:39.4%;" valign="top"> <p style="margin-bottom:0pt;margin-top:0pt;margin-left:0pt;;text-indent:0pt;;color:#000000;font-size:10pt;font-family:Times New Roman;font-weight:normal;font-style:normal;text-transform:none;font-variant: normal;"> </p></td> <td style="background-color:#CFF0FC;padding-left:0pt;padding-Right:0.75pt;padding-Top:0.75pt;padding-Bottom:0pt;width:1.9%;" valign="top"> <p style="margin-bottom:0pt;margin-top:0pt;margin-left:0pt;;text-indent:0pt;;color:#000000;font-size:10pt;font-family:Times New Roman;font-weight:normal;font-style:normal;text-transform:none;font-variant: normal;"> </p></td> <td style="background-color:#CFF0FC;padding-left:0pt;padding-Right:0.75pt;padding-Top:0.75pt;padding-Bottom:0pt;width:1%; border-top:double 2.5pt #000000;white-space:nowrap;" valign="bottom"> <p style="margin-bottom:0pt;margin-top:0pt;margin-left:0pt;;text-indent:0pt;;color:#000000;font-size:10pt;font-family:Times New Roman;font-weight:normal;font-style:normal;text-transform:none;font-variant: normal;"> </p></td> <td style="background-color:#CFF0FC;padding-left:0pt;padding-Right:0.75pt;padding-Top:0.75pt;padding-Bottom:0pt;width:15.34%; border-top:double 2.5pt #000000;white-space:nowrap;" valign="bottom"> <p style="text-align:right;margin-bottom:0pt;margin-top:0pt;margin-left:0pt;;text-indent:0pt;;color:#000000;font-size:10pt;font-family:Times New Roman;font-weight:normal;font-style:normal;text-transform:none;font-variant: normal;"><span style="-sec-ix-hidden:F_001947">5.4</span></p></td> <td style="background-color:#CFF0FC;padding-left:0pt;padding-Right:0.75pt;padding-Top:0.75pt;padding-Bottom:0pt;width:1%;white-space:nowrap;" valign="bottom"> <p style="margin-bottom:0pt;margin-top:0pt;margin-left:0pt;;text-indent:0pt;;color:#000000;font-size:10pt;font-family:Times New Roman;font-weight:normal;font-style:normal;text-transform:none;font-variant: normal;"> </p></td> </tr> <tr> <td style="background-color:#FFFFFF;padding-left:0pt;padding-Right:0.75pt;padding-Top:0.75pt;padding-Bottom:0pt;width:39.4%;" valign="bottom"> <p style="margin-bottom:0pt;margin-top:0pt;margin-left:0pt;;text-indent:0pt;;color:#000000;font-size:10pt;font-family:Times New Roman;font-weight:normal;font-style:normal;text-transform:none;font-variant: normal;">Weighted-average discount rate</p></td> <td style="background-color:#FFFFFF;padding-left:0pt;padding-Right:0.75pt;padding-Top:0.75pt;padding-Bottom:0pt;width:1.9%;" valign="top"> <p style="margin-bottom:0pt;margin-top:0pt;margin-left:0pt;;text-indent:0pt;;color:#000000;font-size:10pt;font-family:Times New Roman;font-weight:normal;font-style:normal;text-transform:none;font-variant: normal;"> </p></td> <td style="background-color:#FFFFFF;padding-left:0pt;padding-Right:0.75pt;padding-Top:0.75pt;padding-Bottom:0pt;width:39.4%;" valign="top"> <p style="margin-bottom:0pt;margin-top:0pt;margin-left:0pt;;text-indent:0pt;;color:#000000;font-size:10pt;font-family:Times New Roman;font-weight:normal;font-style:normal;text-transform:none;font-variant: normal;"> </p></td> <td style="background-color:#FFFFFF;padding-left:0pt;padding-Right:0.75pt;padding-Top:0.75pt;padding-Bottom:0pt;width:1.9%;" valign="top"> <p style="margin-bottom:0pt;margin-top:0pt;margin-left:0pt;;text-indent:0pt;;color:#000000;font-size:10pt;font-family:Times New Roman;font-weight:normal;font-style:normal;text-transform:none;font-variant: normal;"> </p></td> <td style="background-color:#FFFFFF;padding-left:0pt;padding-Right:0.75pt;padding-Top:0.75pt;padding-Bottom:0pt;width:1%;white-space:nowrap;" valign="bottom"> <p style="margin-bottom:0pt;margin-top:0pt;margin-left:0pt;;text-indent:0pt;;color:#000000;font-size:10pt;font-family:Times New Roman;font-weight:normal;font-style:normal;text-transform:none;font-variant: normal;"> </p></td> <td style="background-color:#FFFFFF;padding-left:0pt;padding-Right:0.75pt;padding-Top:0.75pt;padding-Bottom:0pt;width:15.34%;white-space:nowrap;" valign="bottom"> <p style="text-align:right;margin-bottom:0pt;margin-top:0pt;margin-left:0pt;;text-indent:0pt;;color:#000000;font-size:10pt;font-family:Times New Roman;font-weight:normal;font-style:normal;text-transform:none;font-variant: normal;">3.2</p></td> <td style="background-color:#FFFFFF;padding-left:0pt;padding-Right:0.75pt;padding-Top:0.75pt;padding-Bottom:0pt;width:1%;white-space:nowrap;" valign="bottom"> <p style="margin-bottom:0pt;margin-top:0pt;margin-left:0pt;;text-indent:0pt;;color:#000000;font-size:10pt;font-family:Times New Roman;font-weight:normal;font-style:normal;text-transform:none;font-variant: normal;">%</p></td> </tr> </table></div>
CY2021Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	82700000
CY2021Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	309300000
CY2021Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	392000000.0
CY2021Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.032
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due Next Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths	101600000
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	94500000
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	67900000
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	51400000
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Five LesseeOperatingLeaseLiabilityPaymentsDueYearFive	39000000.0
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due After Year Five LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive	77300000
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	431700000
CY2021Q4	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	39700000
CY2021Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	392000000.0
CY2021	us-gaap	Lessee Operating Lease Option To Extend LesseeOperatingLeaseOptionToExtend	20.0 years
CY2021Q4	ajg	Operating Lease Liability Not Yet Commenced OperatingLeaseLiabilityNotYetCommenced	12000000.0
CY2021Q4	us-gaap	Derivative Notional Amount DerivativeNotionalAmount	1017300000
CY2021Q4	us-gaap	Derivative Asset Notional Amount DerivativeAssetNotionalAmount	16800000
CY2021Q4	us-gaap	Derivative Liability Notional Amount DerivativeLiabilityNotionalAmount	21300000
CY2020Q4	us-gaap	Derivative Notional Amount DerivativeNotionalAmount	598600000
CY2020Q4	us-gaap	Derivative Asset Notional Amount DerivativeAssetNotionalAmount	13700000
CY2020Q4	us-gaap	Derivative Liability Notional Amount DerivativeLiabilityNotionalAmount	69300000
CY2021	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification Before Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationBeforeTax	22300000
CY2021	us-gaap	Derivative Instruments Gain Loss Reclassified From Accumulated Oci Into Income Effective Portion Net DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet	-5800000
CY2021	ajg	Amount Of Gain Loss Recognized Effectiveness Testing AmountOfGainLossRecognizedEffectivenessTesting	1700000
CY2020	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification Before Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationBeforeTax	-97100000
CY2020	us-gaap	Derivative Instruments Gain Loss Reclassified From Accumulated Oci Into Income Effective Portion Net DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet	-6300000
CY2020	ajg	Amount Of Gain Loss Recognized Effectiveness Testing AmountOfGainLossRecognizedEffectivenessTesting	2300000
CY2021Q4	ajg	Number Of Square Feet NumberOfSquareFeet	360000
CY2021	us-gaap	Direct Premiums Written DirectPremiumsWritten	30900000
CY2021	ajg	Business Combination Aggregate Earnout Obligation Recorded Maximum BusinessCombinationAggregateEarnoutObligationRecordedMaximum	988500000
CY2021	us-gaap	Direct Premiums Earned DirectPremiumsEarned	35900000
CY2019	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	3800000
CY2021	ajg	Amount Of Commitment Expiration Off Balance Sheet Commitments AmountOfCommitmentExpirationOffBalanceSheetCommitments	22600000
CY2021	ajg	Business Combination Aggregate Earnout Obligation Maximum BusinessCombinationAggregateEarnoutObligationMaximum	1873900000
CY2021	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	44600000
CY2021	us-gaap	Operating Lease Expense OperatingLeaseExpense	153400000
CY2020	us-gaap	Operating Lease Expense OperatingLeaseExpense	154000000.0
CY2019	us-gaap	Operating Lease Expense OperatingLeaseExpense	148100000
CY2021	ajg	Amount Of Commitment Expiration Off Balance Sheet Commitments Within Year One AmountOfCommitmentExpirationOffBalanceSheetCommitmentsWithinYearOne	1800000
CY2021	ajg	Amount Of Commitment Expiration Off Balance Sheet Commitments Within Year Two AmountOfCommitmentExpirationOffBalanceSheetCommitmentsWithinYearTwo	1400000
CY2021	ajg	Amount Of Commitment Expiration Off Balance Sheet Commitments Within Year Three AmountOfCommitmentExpirationOffBalanceSheetCommitmentsWithinYearThree	2000000.0
CY2021	ajg	Amount Of Commitment Expiration Off Balance Sheet Commitments Within Year Four AmountOfCommitmentExpirationOffBalanceSheetCommitmentsWithinYearFour	200000
CY2021	ajg	Amount Of Commitment Expiration Off Balance Sheet Commitments Within Year Five AmountOfCommitmentExpirationOffBalanceSheetCommitmentsWithinYearFive	100000
CY2021	ajg	Amount Of Commitment Expiration Off Balance Sheet Commitments Within Year Thereafter AmountOfCommitmentExpirationOffBalanceSheetCommitmentsWithinYearThereafter	17100000
CY2021Q4	ajg	Business Combination Aggregate Earnout Obligation Expected Settlement In Cash Or Stock At Option BusinessCombinationAggregateEarnoutObligationExpectedSettlementInCashOrStockAtOption	670300000
CY2021Q4	ajg	Business Combination Aggregate Earnout Obligation Expected Settlement In Cash BusinessCombinationAggregateEarnoutObligationExpectedSettlementInCash	318200000
CY2021Q4	us-gaap	Long Term Debt LongTermDebt	22600000
CY2021Q4	ajg	Liabilities Recorded On Self Insurance LiabilitiesRecordedOnSelfInsurance	18300000
CY2021	us-gaap	Income Tax Credits And Adjustments IncomeTaxCreditsAndAdjustments	108000000.0
CY2020	us-gaap	Direct Premiums Written DirectPremiumsWritten	37700000
CY2020	us-gaap	Direct Premiums Earned DirectPremiumsEarned	40700000
CY2019	us-gaap	Direct Premiums Written DirectPremiumsWritten	44600000
CY2019	us-gaap	Direct Premiums Earned DirectPremiumsEarned	59100000
CY2021	us-gaap	Assumed Premiums Written AssumedPremiumsWritten	200000
CY2021	us-gaap	Assumed Premiums Earned AssumedPremiumsEarned	200000
CY2020	us-gaap	Assumed Premiums Written AssumedPremiumsWritten	100000
CY2020	us-gaap	Assumed Premiums Earned AssumedPremiumsEarned	900000
CY2019	us-gaap	Assumed Premiums Written AssumedPremiumsWritten	1000000.0
CY2019	us-gaap	Assumed Premiums Earned AssumedPremiumsEarned	1900000
CY2021	us-gaap	Ceded Premiums Written CededPremiumsWritten	31100000
CY2021	us-gaap	Ceded Premiums Earned CededPremiumsEarned	36100000
CY2020	us-gaap	Ceded Premiums Written CededPremiumsWritten	37800000
CY2020	us-gaap	Ceded Premiums Earned CededPremiumsEarned	41600000
CY2019	us-gaap	Ceded Premiums Written CededPremiumsWritten	45600000
CY2019	us-gaap	Ceded Premiums Earned CededPremiumsEarned	61000000.0
CY2021Q4	us-gaap	Reinsurance Recoverables ReinsuranceRecoverables	28000000.0
CY2020Q4	us-gaap	Reinsurance Recoverables ReinsuranceRecoverables	48500000
CY2021	us-gaap	Interest Expense Domestic Deposits InterestExpenseDomesticDeposits	21900000
CY2020	us-gaap	Interest Expense Domestic Deposits InterestExpenseDomesticDeposits	24000000.0
CY2019	us-gaap	Interest Expense Domestic Deposits InterestExpenseDomesticDeposits	40100000
CY2021	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	593000000.0
CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	524400000
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	388400000
CY2021	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	382100000
CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	346500000
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	237700000
CY2021	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	975100000
CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	870900000
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	626100000
CY2020	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	43600000
CY2020Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	9500000
CY2021	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-11600000
CY2021Q4	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued	3300000
CY2020	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-19300000
CY2019	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-6000000.0
CY2020	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	-30300000
CY2021	us-gaap	State And Local Income Tax Expense Benefit Continuing Operations StateAndLocalIncomeTaxExpenseBenefitContinuingOperations	39000000.0
CY2021	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-151600000
CY2020	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-112400000
CY2019	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-142500000
CY2021	us-gaap	Federal Income Tax Expense Benefit Continuing Operations FederalIncomeTaxExpenseBenefitContinuingOperations	-107000000.0
CY2020	us-gaap	Federal Income Tax Expense Benefit Continuing Operations FederalIncomeTaxExpenseBenefitContinuingOperations	-68800000
CY2019	us-gaap	Federal Income Tax Expense Benefit Continuing Operations FederalIncomeTaxExpenseBenefitContinuingOperations	-138700000
CY2021	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	50600000
CY2020	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	36600000
CY2019	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	11100000
CY2020	us-gaap	State And Local Income Tax Expense Benefit Continuing Operations StateAndLocalIncomeTaxExpenseBenefitContinuingOperations	17300000
CY2019	us-gaap	State And Local Income Tax Expense Benefit Continuing Operations StateAndLocalIncomeTaxExpenseBenefitContinuingOperations	5100000
CY2021	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	108800000
CY2020	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	94600000
CY2019	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	66600000
CY2021	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	-20700000
CY2019	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	-22700000
CY2021	us-gaap	Foreign Income Tax Expense Benefit Continuing Operations ForeignIncomeTaxExpenseBenefitContinuingOperations	88100000
CY2020	us-gaap	Foreign Income Tax Expense Benefit Continuing Operations ForeignIncomeTaxExpenseBenefitContinuingOperations	64300000
CY2019	us-gaap	Foreign Income Tax Expense Benefit Continuing Operations ForeignIncomeTaxExpenseBenefitContinuingOperations	43900000
CY2021	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	20100000
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	12800000
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-89700000
CY2021	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	204800000
CY2021	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.210
CY2020	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	182900000
CY2020	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.210
CY2019	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	131500000
CY2019	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.210
CY2021	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	30700000
CY2021	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.032
CY2020	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	22200000
CY2020	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.026
CY2019	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	4400000
CY2019	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.007
CY2021	us-gaap	Income Tax Reconciliation Foreign Income Tax Rate Differential IncomeTaxReconciliationForeignIncomeTaxRateDifferential	-8700000
CY2021	us-gaap	Effective Income Tax Rate Reconciliation Foreign Income Tax Rate Differential EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential	-0.009
CY2020	us-gaap	Income Tax Reconciliation Foreign Income Tax Rate Differential IncomeTaxReconciliationForeignIncomeTaxRateDifferential	-2500000
CY2020	us-gaap	Effective Income Tax Rate Reconciliation Foreign Income Tax Rate Differential EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential	-0.003
CY2019	us-gaap	Income Tax Reconciliation Foreign Income Tax Rate Differential IncomeTaxReconciliationForeignIncomeTaxRateDifferential	-10100000
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Foreign Income Tax Rate Differential EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential	-0.016
CY2021	us-gaap	Income Tax Reconciliation Tax Credits IncomeTaxReconciliationTaxCredits	199000000.0
CY2021	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits EffectiveIncomeTaxRateReconciliationTaxCredits	0.204
CY2020	us-gaap	Income Tax Reconciliation Tax Credits IncomeTaxReconciliationTaxCredits	154300000
CY2020	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits EffectiveIncomeTaxRateReconciliationTaxCredits	0.177
CY2019	us-gaap	Income Tax Reconciliation Tax Credits IncomeTaxReconciliationTaxCredits	196100000
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits EffectiveIncomeTaxRateReconciliationTaxCredits	0.313
CY2021	ajg	Income Tax Reconciliation Other Permanent Differences IncomeTaxReconciliationOtherPermanentDifferences	-3500000
CY2021	ajg	Effective Income Tax Rate Reconciliation Other Permanent Differences EffectiveIncomeTaxRateReconciliationOtherPermanentDifferences	-0.004
CY2020	ajg	Income Tax Reconciliation Other Permanent Differences IncomeTaxReconciliationOtherPermanentDifferences	-15700000
CY2020	ajg	Effective Income Tax Rate Reconciliation Other Permanent Differences EffectiveIncomeTaxRateReconciliationOtherPermanentDifferences	-0.018
CY2020Q4	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued	3000000.0
CY2021	us-gaap	Labor And Related Expense LaborAndRelatedExpense	3927500000
CY2020	us-gaap	Income Tax Reconciliation Nondeductible Expense Share Based Compensation Cost IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost	-31400000
CY2020	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Share Based Compensation Cost EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost	-0.036
CY2019	us-gaap	Income Tax Reconciliation Nondeductible Expense Share Based Compensation Cost IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost	-16200000
CY2021	us-gaap	Effective Income Tax Rate Reconciliation Change In Deferred Tax Assets Valuation Allowance EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance	0.027
CY2020	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	6500000
CY2020	us-gaap	Effective Income Tax Rate Reconciliation Change In Deferred Tax Assets Valuation Allowance EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance	0.007
CY2019	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	7500000
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Change In Deferred Tax Assets Valuation Allowance EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance	0.012
CY2021	us-gaap	Income Tax Reconciliation Change In Enacted Tax Rate IncomeTaxReconciliationChangeInEnactedTaxRate	8600000
CY2021	us-gaap	Effective Income Tax Rate Reconciliation Change In Enacted Tax Rate EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate	0.009
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Share Based Compensation Cost EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost	-0.026
CY2021	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	800000
CY2021	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	0.001
CY2019	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	800000
CY2019	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	0.001
CY2021	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	26400000
CY2019	ajg	Income Tax Reconciliation Other Permanent Differences IncomeTaxReconciliationOtherPermanentDifferences	-7600000
CY2019	ajg	Effective Income Tax Rate Reconciliation Other Permanent Differences EffectiveIncomeTaxRateReconciliationOtherPermanentDifferences	-0.012
CY2021	us-gaap	Income Tax Reconciliation Nondeductible Expense Share Based Compensation Cost IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost	-40000000.0
CY2021	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Share Based Compensation Cost EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost	-0.041
CY2020	us-gaap	Income Tax Reconciliation Change In Enacted Tax Rate IncomeTaxReconciliationChangeInEnactedTaxRate	5500000
CY2020	us-gaap	Effective Income Tax Rate Reconciliation Change In Enacted Tax Rate EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate	0.006
CY2019	us-gaap	Income Tax Reconciliation Change In Enacted Tax Rate IncomeTaxReconciliationChangeInEnactedTaxRate	-3700000
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Change In Enacted Tax Rate EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate	-0.006
CY2020	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-400000
CY2019	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-200000
CY2021	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	20100000
CY2021	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.021
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	12800000
CY2020	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.015
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-89700000
CY2019	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	-0.143
CY2020Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	11200000
CY2019Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	11500000
CY2021	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	2500000
CY2020	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	2900000
CY2020	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	1100000
CY2021	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	1600000
CY2020	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	1200000
CY2021	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	100000
CY2020	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	200000
CY2021	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	500000
CY2020	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	1100000
CY2021Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	11700000
CY2020Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	11200000
CY2021Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	10000000.0
CY2021Q4	us-gaap	Deferred Tax Assets Capital Loss Carryforwards DeferredTaxAssetsCapitalLossCarryforwards	8900000
CY2021Q4	us-gaap	Deferred Tax Assets Investments DeferredTaxAssetsInvestments	3100000
CY2020Q4	us-gaap	Deferred Tax Assets Capital Loss Carryforwards DeferredTaxAssetsCapitalLossCarryforwards	9000000.0
CY2021	us-gaap	Operating Expenses OperatingExpenses	1072400000
CY2021Q4	ajg	Deferred Tax Assets Alternative Minimum Tax And Other Credit Carryforwards DeferredTaxAssetsAlternativeMinimumTaxAndOtherCreditCarryforwards	1074000000.0
CY2020Q4	ajg	Deferred Tax Assets Alternative Minimum Tax And Other Credit Carryforwards DeferredTaxAssetsAlternativeMinimumTaxAndOtherCreditCarryforwards	998000000.0
CY2021Q4	ajg	Deferred Tax Assets Accrued And Unfunded Compensation And Employee Benefits DeferredTaxAssetsAccruedAndUnfundedCompensationAndEmployeeBenefits	265600000
CY2020Q4	ajg	Deferred Tax Assets Accrued And Unfunded Compensation And Employee Benefits DeferredTaxAssetsAccruedAndUnfundedCompensationAndEmployeeBenefits	239900000
CY2021Q4	us-gaap	Deferred Tax Assets Goodwill And Intangible Assets DeferredTaxAssetsGoodwillAndIntangibleAssets	92700000
CY2020Q4	us-gaap	Deferred Tax Assets Goodwill And Intangible Assets DeferredTaxAssetsGoodwillAndIntangibleAssets	61300000
CY2021Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Share Based Compensation Cost DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost	5800000
CY2020Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Share Based Compensation Cost DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost	14400000
CY2021Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Accrued Liabilities DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities	112100000
CY2020Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Accrued Liabilities DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities	65700000
CY2021Q4	ajg	Deferred Tax Assets Accrued Pension Liability DeferredTaxAssetsAccruedPensionLiability	1500000
CY2020Q4	ajg	Deferred Tax Assets Accrued Pension Liability DeferredTaxAssetsAccruedPensionLiability	9300000
CY2020Q4	us-gaap	Deferred Tax Assets Investments DeferredTaxAssetsInvestments	1300000
CY2021Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	32700000
CY2020Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	36100000
CY2021Q4	ajg	Deferred Tax Assets Revenue Recognition DeferredTaxAssetsRevenueRecognition	3700000
CY2021Q4	ajg	Deferred Tax Assets Lease Liabilities DeferredTaxAssetsLeaseLiabilities	106400000
CY2020Q4	ajg	Deferred Tax Assets Lease Liabilities DeferredTaxAssetsLeaseLiabilities	96300000
CY2021Q4	us-gaap	Deferred Tax Assets Hedging Transactions DeferredTaxAssetsHedgingTransactions	27300000
CY2020Q4	us-gaap	Deferred Tax Assets Hedging Transactions DeferredTaxAssetsHedgingTransactions	34600000
CY2021Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	5000000.0
CY2020Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	2800000
CY2021Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	1738800000
CY2020Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	1568700000
CY2021Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	154900000
CY2020Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	94900000
CY2021Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	1583900000
CY2020Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	1473800000
CY2021Q4	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets Intangible Assets DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets	394700000
CY2020Q4	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets Intangible Assets DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets	316900000
CY2021Q4	ajg	Deferred Tax Liabilities Investment Related Partnerships DeferredTaxLiabilitiesInvestmentRelatedPartnerships	4600000
CY2020Q4	ajg	Deferred Tax Liabilities Investment Related Partnerships DeferredTaxLiabilitiesInvestmentRelatedPartnerships	8500000
CY2021Q4	ajg	Deferred Tax Liabilities Depreciable Fixed Assets DeferredTaxLiabilitiesDepreciableFixedAssets	16200000
CY2020Q4	ajg	Deferred Tax Liabilities Depreciable Fixed Assets DeferredTaxLiabilitiesDepreciableFixedAssets	32400000
CY2021Q4	ajg	Deferred Tax Liabilities Right Of Use Asset DeferredTaxLiabilitiesRightOfUseAsset	96900000
CY2020Q4	ajg	Deferred Tax Liabilities Right Of Use Asset DeferredTaxLiabilitiesRightOfUseAsset	92200000
CY2020Q4	ajg	Deferred Tax Liabilities Revenue Recognition DeferredTaxLiabilitiesRevenueRecognition	33100000
CY2021Q4	ajg	Deferred Tax Liabilities Other Prepaid Items DeferredTaxLiabilitiesOtherPrepaidItems	8800000
CY2020Q4	ajg	Deferred Tax Liabilities Other Prepaid Items DeferredTaxLiabilitiesOtherPrepaidItems	12000000.0
CY2021Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	521200000
CY2020Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	495100000
CY2021Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	1062700000
CY2020Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	978700000
CY2021Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	32700000
CY2021	ajg	Deferred Tax Assets Operating Loss Carryforward Expiration Year DeferredTaxAssetsOperatingLossCarryforwardExpirationYear	2023
CY2021Q4	us-gaap	Deferred Tax Liabilities Undistributed Foreign Earnings DeferredTaxLiabilitiesUndistributedForeignEarnings	806000000.0
CY2020Q4	us-gaap	Deferred Tax Liabilities Undistributed Foreign Earnings DeferredTaxLiabilitiesUndistributedForeignEarnings	658900000
CY2021Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Employee Compensation DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation	6500000
CY2020Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Employee Compensation DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation	12900000
CY2020	us-gaap	Interest Paid InterestPaid	188900000
CY2021	ajg	Cost Reimbursements CostReimbursements	133000000.0
CY2021	ajg	Revenue From Contract With Customer Excluding Assessed Tax Reimbursements RevenueFromContractWithCustomerExcludingAssessedTaxReimbursements	133000000.0
CY2019	us-gaap	Interest Paid InterestPaid	169200000
CY2021	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	8209400000
CY2021	us-gaap	Interest Paid InterestPaid	215700000
CY2021	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	325400000
CY2020	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	113000000.0
CY2019	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	22200000
CY2021	us-gaap	Proceeds From Income Tax Refunds ProceedsFromIncomeTaxRefunds	28500000
CY2020	us-gaap	Proceeds From Income Tax Refunds ProceedsFromIncomeTaxRefunds	20000000.0
CY2019	us-gaap	Proceeds From Income Tax Refunds ProceedsFromIncomeTaxRefunds	63600000
CY2021Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense DeferredTaxAssetsTaxDeferredExpense	20000000.0
CY2021Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Returns And Allowances DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsReturnsAndAllowances	106000000.0
CY2021Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	402600000
CY2020Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	664600000
CY2019Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	604800000
CY2021Q4	us-gaap	Restricted Cash Current RestrictedCashCurrent	4063700000
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CY2021Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	4466300000
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	3574300000
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	2623900000
CY2021	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax	5800000
CY2020	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax	6100000
CY2019	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax	7000000.0
CY2021	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification Before Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationBeforeTax	5800000
CY2020	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification Before Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationBeforeTax	6300000
CY2019	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification Before Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationBeforeTax	5200000
CY2020	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Reclassification Adjustment From Aoci Realized Upon Sale Or Liquidation Before Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationReclassificationAdjustmentFromAOCIRealizedUponSaleOrLiquidationBeforeTax	0
CY2019	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Reclassification Adjustment From Aoci Realized Upon Sale Or Liquidation Before Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationReclassificationAdjustmentFromAOCIRealizedUponSaleOrLiquidationBeforeTax	0
CY2021	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Reclassification Adjustment From Aoci Realized Upon Sale Or Liquidation Before Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationReclassificationAdjustmentFromAOCIRealizedUponSaleOrLiquidationBeforeTax	0
CY2021	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	3
CY2021	ajg	Revenue From Contract With Customer Before Reimbursements Excluding Assessed Tax RevenueFromContractWithCustomerBeforeReimbursementsExcludingAssessedTax	8076400000
CY2019	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	47000000.0
CY2019	us-gaap	Net Income Loss NetIncomeLoss	668800000
CY2019	us-gaap	Foreign Currency Transaction Gain Loss Before Tax ForeignCurrencyTransactionGainLossBeforeTax	-6700000
CY2019	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	7195000000.0
CY2019Q4	us-gaap	Assets Assets	19634800000
CY2021	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	1173200000
CY2021	us-gaap	Interest Expense InterestExpense	226100000
CY2021	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-16200000
CY2021	us-gaap	Depreciation Depreciation	151200000
CY2021	us-gaap	Adjustment For Amortization AdjustmentForAmortization	415100000
CY2021	ajg	Change In Estimated Acquisition Earnout Payables ChangeInEstimatedAcquisitionEarnoutPayables	119600000
CY2021	us-gaap	Costs And Expenses CostsAndExpenses	7234300000
CY2021	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	975100000
CY2021	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	20100000
CY2021	us-gaap	Profit Loss ProfitLoss	955000000.0
CY2021	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	48200000
CY2021	us-gaap	Net Income Loss NetIncomeLoss	906800000
CY2021	us-gaap	Foreign Currency Transaction Gain Loss Before Tax ForeignCurrencyTransactionGainLossBeforeTax	-2300000
CY2021	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	8209400000
CY2021Q4	us-gaap	Assets Assets	33345000000.0
CY2021Q4	us-gaap	Goodwill Goodwill	8666200000
CY2021Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	3954000000.0
CY2020	ajg	Revenue From Contract With Customer Before Reimbursements Excluding Assessed Tax RevenueFromContractWithCustomerBeforeReimbursementsExcludingAssessedTax	6851900000
CY2020	ajg	Revenue From Contract With Customer Excluding Assessed Tax Reimbursements RevenueFromContractWithCustomerExcludingAssessedTaxReimbursements	151700000
CY2020	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	7003600000
CY2020	us-gaap	Labor And Related Expense LaborAndRelatedExpense	3466500000
CY2020	us-gaap	Operating Expenses OperatingExpenses	906500000
CY2020	ajg	Cost Reimbursements CostReimbursements	151700000
CY2020	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	882100000
CY2020	us-gaap	Interest Expense InterestExpense	196400000
CY2020	us-gaap	Depreciation Depreciation	145100000
CY2020	us-gaap	Adjustment For Amortization AdjustmentForAmortization	417300000
CY2020	ajg	Change In Estimated Acquisition Earnout Payables ChangeInEstimatedAcquisitionEarnoutPayables	-32900000
CY2020	us-gaap	Costs And Expenses CostsAndExpenses	6132700000
CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	870900000
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	12800000
CY2020	us-gaap	Profit Loss ProfitLoss	858100000
CY2020	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	39300000
CY2020	us-gaap	Net Income Loss NetIncomeLoss	818800000
CY2020	us-gaap	Foreign Currency Transaction Gain Loss Before Tax ForeignCurrencyTransactionGainLossBeforeTax	-2900000
CY2020	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	7003600000
CY2020Q4	us-gaap	Assets Assets	22331400000
CY2020Q4	us-gaap	Goodwill Goodwill	6127000000.0
CY2020Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	2399900000
CY2019	ajg	Revenue From Contract With Customer Before Reimbursements Excluding Assessed Tax RevenueFromContractWithCustomerBeforeReimbursementsExcludingAssessedTax	7056400000
CY2019	ajg	Revenue From Contract With Customer Excluding Assessed Tax Reimbursements RevenueFromContractWithCustomerExcludingAssessedTaxReimbursements	138600000
CY2019	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	7195000000.0
CY2019	us-gaap	Labor And Related Expense LaborAndRelatedExpense	3339500000
CY2019	us-gaap	Operating Expenses OperatingExpenses	1068500000
CY2019	ajg	Cost Reimbursements CostReimbursements	138600000
CY2019	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	1352800000
CY2019	us-gaap	Interest Expense InterestExpense	179800000
CY2019	us-gaap	Depreciation Depreciation	140400000
CY2019	us-gaap	Adjustment For Amortization AdjustmentForAmortization	334000000.0
CY2019	ajg	Change In Estimated Acquisition Earnout Payables ChangeInEstimatedAcquisitionEarnoutPayables	15300000
CY2019	us-gaap	Costs And Expenses CostsAndExpenses	6568900000
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	626100000
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-89700000
CY2019	us-gaap	Profit Loss ProfitLoss	715800000
CY2019Q4	us-gaap	Goodwill Goodwill	5618500000
CY2019Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	2318700000
CY2021	dei	Auditor Name AuditorName	Ernst & Young LLP
CY2021	dei	Auditor Location AuditorLocation	Chicago, Illinois
CY2021	dei	Auditor Firm AuditorFirmId	42

Files In Submission

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

2021 Q4 Form 10-K Financial Statement

#000156459022005714 Filed on February 18, 2022

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

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

2021 Q4 Form 10-K Financial Statement

#000156459022005714 Filed on February 18, 2022

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

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