$AIZ
ASSURANT, INC. Stock $aiz

$aiz Overview Financials Valuation SEC Filings Company Website

2024 Q4 Form 10-Q Financial Statement

#000126723824000047 Filed on November 07, 2024

Income Statement

Concept	2024 Q4	2024 Q3
Revenue		$2.968B
YoY Change		6.98%
Cost Of Revenue		$776.8M
YoY Change		20.51%
Gross Profit		$2.191B
YoY Change		2.88%
Gross Profit Margin		73.82%
Selling, General & Admin		$2.013B
YoY Change		7.42%
% of Gross Profit		91.87%
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization		$962.5M
YoY Change		-4.27%
% of Gross Profit		43.93%
Operating Expenses		$2.790B
YoY Change		10.77%
Operating Profit		-$598.6M
YoY Change		53.96%
Interest Expense		-$26.70M
YoY Change		-198.89%
% of Operating Profit
Other Income/Expense, Net
YoY Change
Pretax Income		$151.5M
YoY Change		-33.78%
Income Tax		$17.70M
% Of Pretax Income		11.68%
Net Earnings		$133.8M
YoY Change		-29.62%
Net Earnings / Revenue		4.51%
Basic Earnings Per Share		$2.56
Diluted Earnings Per Share		$2.55
COMMON SHARES
Basic Shares Outstanding	51.29M shares	51.79M shares
Diluted Shares Outstanding		52.46M shares

Balance Sheet

Concept	2024 Q4	2024 Q3
SHORT-TERM ASSETS
Cash & Short-Term Investments
YoY Change
Cash & Equivalents		$1.813B
Short-Term Investments
Other Short-Term Assets
YoY Change
Inventory
Prepaid Expenses
Receivables
Other Receivables
Total Short-Term Assets
YoY Change
LONG-TERM ASSETS
Property, Plant & Equipment		$742.2M
YoY Change		11.71%
Goodwill		$2.625B
YoY Change		0.77%
Intangibles		$545.9M
YoY Change		-7.46%
Long-Term Investments		$8.971B
YoY Change		13.23%
Other Assets
YoY Change
Total Long-Term Assets
YoY Change
TOTAL ASSETS
Total Short-Term Assets
Total Long-Term Assets
Total Assets		$35.33B
YoY Change		6.39%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable		$2.746B
YoY Change		6.75%
Accrued Expenses
YoY Change
Deferred Revenue
YoY Change
Short-Term Debt		$0.00
YoY Change
Long-Term Debt Due
YoY Change
Total Short-Term Liabilities		$6.321B
YoY Change		21.91%
LONG-TERM LIABILITIES
Long-Term Debt		$2.083B
YoY Change		0.12%
Other Long-Term Liabilities
YoY Change
Total Long-Term Liabilities		$2.083B
YoY Change		0.12%
TOTAL LIABILITIES
Total Short-Term Liabilities		$6.321B
Total Long-Term Liabilities		$2.083B
Total Liabilities		$30.08B
YoY Change		4.73%
SHAREHOLDERS EQUITY
Retained Earnings		$4.322B
YoY Change		8.29%
Common Stock		$1.684B
YoY Change		0.6%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity		$5.255B
YoY Change
Total Liabilities & Shareholders Equity		$35.33B
YoY Change		6.39%

Cashflow Statement

Concept	2024 Q4	2024 Q3
OPERATING ACTIVITIES
Net Income		$133.8M
YoY Change		-29.62%
Depreciation, Depletion And Amortization		$962.5M
YoY Change		-4.27%
Cash From Operating Activities		$436.5M
YoY Change		32.07%
INVESTING ACTIVITIES
Capital Expenditures		$47.10M
YoY Change		-6.55%
Acquisitions
YoY Change
Other Investing Activities		-$160.1M
YoY Change		50.19%
Cash From Investing Activities		-$207.2M
YoY Change		31.97%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities		-140.8M
YoY Change		-0.49%
NET CHANGE
Cash From Operating Activities		436.5M
Cash From Investing Activities		-207.2M
Cash From Financing Activities		-140.8M
Net Change In Cash		88.50M
YoY Change		176.56%
FREE CASH FLOW
Cash From Operating Activities		$436.5M
Capital Expenditures		$47.10M
Free Cash Flow		$389.4M
YoY Change		39.02%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
	dei	Entity Central Index Key EntityCentralIndexKey	0001267238
	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	Q3
	dei	Amendment Flag AmendmentFlag	false
	dei	Document Quarterly Report DocumentQuarterlyReport	true
	dei	Document Period End Date DocumentPeriodEndDate	2024-09-30
	dei	Document Transition Report DocumentTransitionReport	false
	dei	Entity Registrant Name EntityRegistrantName	Assurant, Inc.
	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	DE
	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	39-1126612
	dei	Entity Address Address Line1 EntityAddressAddressLine1	260 Interstate North Circle SE
	dei	Entity Address City Or Town EntityAddressCityOrTown	Atlanta
	dei	Entity Address State Or Province EntityAddressStateOrProvince	GA
	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
	dei	Entity Small Business EntitySmallBusiness	false
	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
	dei	Entity Shell Company EntityShellCompany	false
CY2024Q4	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	51287376	shares
CY2024Q3	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	7766400000	usd
CY2023Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	7292400000	usd
CY2024Q3	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	7596100000	usd
CY2023Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	6912100000	usd
CY2024Q3	us-gaap	Equity Securities Fv Ni EquitySecuritiesFvNi	219400000	usd
CY2023Q4	us-gaap	Equity Securities Fv Ni EquitySecuritiesFvNi	223000000.0	usd
CY2024Q3	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	6400000	usd
CY2023Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	4000000.0	usd
CY2024Q3	us-gaap	Mortgage Loans On Real Estate Commercial And Consumer Net MortgageLoansOnRealEstateCommercialAndConsumerNet	329000000.0	usd
CY2023Q4	us-gaap	Mortgage Loans On Real Estate Commercial And Consumer Net MortgageLoansOnRealEstateCommercialAndConsumerNet	328700000	usd
CY2024Q3	us-gaap	Other Short Term Investments OtherShortTermInvestments	325000000.0	usd
CY2023Q4	aiz	Premiums And Accounts Receivable Allowance For Credit Loss PremiumsAndAccountsReceivableAllowanceForCreditLoss	9000000.0	usd
CY2024Q3	us-gaap	Premiums And Other Receivables Net PremiumsAndOtherReceivablesNet	1782600000	usd
CY2023Q4	us-gaap	Premiums And Other Receivables Net PremiumsAndOtherReceivablesNet	2265600000	usd
CY2024Q3	us-gaap	Reinsurance Recoverables Allowance ReinsuranceRecoverablesAllowance	4600000	usd
CY2024Q3	us-gaap	Reinsurance Recoverables ReinsuranceRecoverables	7631800000	usd
CY2023Q4	us-gaap	Reinsurance Recoverables ReinsuranceRecoverables	6649200000	usd
CY2024Q3	us-gaap	Accrued Investment Income Receivable AccruedInvestmentIncomeReceivable	120300000	usd
CY2023Q4	us-gaap	Accrued Investment Income Receivable AccruedInvestmentIncomeReceivable	97000000.0	usd
CY2024Q3	us-gaap	Deferred Policy Acquisition Costs DeferredPolicyAcquisitionCosts	10083800000	usd
CY2023Q4	us-gaap	Deferred Policy Acquisition Costs DeferredPolicyAcquisitionCosts	9967200000	usd
CY2024Q3	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	742200000	usd
CY2023Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	685800000	usd
CY2024Q3	us-gaap	Goodwill Goodwill	2625200000	usd
CY2023Q4	us-gaap	Goodwill Goodwill	2608800000	usd
CY2024Q3	us-gaap	Value Of Business Acquired Voba ValueOfBusinessAcquiredVOBA	11700000	usd
CY2023Q4	us-gaap	Value Of Business Acquired Voba ValueOfBusinessAcquiredVOBA	83900000	usd
CY2024Q3	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	545900000	usd
CY2023Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	567100000	usd
CY2024Q3	aiz	Other Assets Allowance For Credit Loss OtherAssetsAllowanceForCreditLoss	700000	usd
CY2023Q4	aiz	Other Assets Allowance For Credit Loss OtherAssetsAllowanceForCreditLoss	700000	usd
CY2024Q3	us-gaap	Other Assets OtherAssets	1004200000	usd
CY2023Q4	us-gaap	Other Assets OtherAssets	862300000	usd
CY2024Q3	us-gaap	Assets Assets	35332300000	usd
CY2023Q4	us-gaap	Assets Assets	33635200000	usd
CY2024Q3	us-gaap	Liability For Future Policy Benefits LiabilityForFuturePolicyBenefits	504000000.0	usd
CY2023Q4	us-gaap	Liability For Future Policy Benefits LiabilityForFuturePolicyBenefits	487200000	usd
CY2024Q3	us-gaap	Unearned Premiums UnearnedPremiums	20400000000	usd
CY2023Q4	us-gaap	Unearned Premiums UnearnedPremiums	20110400000	usd
CY2024Q3	us-gaap	Liability For Claims And Claims Adjustment Expense LiabilityForClaimsAndClaimsAdjustmentExpense	3049000000	usd
CY2023Q4	us-gaap	Liability For Claims And Claims Adjustment Expense LiabilityForClaimsAndClaimsAdjustmentExpense	1989200000	usd
CY2024Q3	us-gaap	Accrued Sales Commission Current And Noncurrent AccruedSalesCommissionCurrentAndNoncurrent	526200000	usd
CY2023Q4	us-gaap	Accrued Sales Commission Current And Noncurrent AccruedSalesCommissionCurrentAndNoncurrent	542800000	usd
CY2024Q3	us-gaap	Reinsurance Payable ReinsurancePayable	511800000	usd
CY2023Q4	us-gaap	Reinsurance Payable ReinsurancePayable	430100000	usd
CY2024Q3	us-gaap	Funds Held Under Reinsurance Agreements Liability FundsHeldUnderReinsuranceAgreementsLiability	257800000	usd
CY2024Q3	aiz	High Deductible Claims Allowance For Credit Loss For Unsecured Portion Of Recoverables HighDeductibleClaimsAllowanceForCreditLossForUnsecuredPortionOfRecoverables	3900000	usd
CY2023Q4	aiz	High Deductible Claims Allowance For Credit Loss For Unsecured Portion Of Recoverables HighDeductibleClaimsAllowanceForCreditLossForUnsecuredPortionOfRecoverables	8300000	usd
CY2024Q3	us-gaap	Accounts Payable And Accrued Liabilities Current And Noncurrent AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent	2745700000	usd
CY2023Q4	us-gaap	Accounts Payable And Accrued Liabilities Current And Noncurrent AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent	2792700000	usd
CY2024Q3	us-gaap	Unsecured Debt UnsecuredDebt	2082500000	usd
CY2023Q4	us-gaap	Unsecured Debt UnsecuredDebt	2080600000	usd
CY2024Q3	us-gaap	Liabilities Liabilities	30077000000	usd
CY2024Q3	us-gaap	Common Stock Value CommonStockValue	500000	usd
CY2023Q4	us-gaap	Treasury Stock Common Shares TreasuryStockCommonShares	2296089	shares
CY2024Q3	us-gaap	Treasury Stock Common Shares TreasuryStockCommonShares	2296089	shares
CY2024Q3	us-gaap	Stockholders Equity StockholdersEquity	5255300000	usd
CY2023Q4	us-gaap	Stockholders Equity StockholdersEquity	4809500000	usd
	us-gaap	Premiums Earned Net PremiumsEarnedNet	6965800000	usd
CY2023Q3	us-gaap	Other Income OtherIncome	310400000	usd
	us-gaap	Other Income OtherIncome	1200000000	usd
	us-gaap	Other Income OtherIncome	888800000	usd
CY2023Q3	us-gaap	Net Investment Income NetInvestmentIncome	125500000	usd
	us-gaap	Net Investment Income NetInvestmentIncome	381100000	usd
	us-gaap	Net Investment Income NetInvestmentIncome	343600000	usd
CY2023Q3	aiz	Investment Impairment Lossesincludedin Net Realized Gains Losses InvestmentImpairmentLossesincludedinNetRealizedGainsLosses	800000	usd
CY2023Q3	us-gaap	Gain Loss On Investments GainLossOnInvestments	-19100000	usd
	us-gaap	Gain Loss On Investments GainLossOnInvestments	-46700000	usd
	us-gaap	Gain Loss On Investments GainLossOnInvestments	-49700000	usd
	us-gaap	Net Income Loss NetIncomeLoss	460000000.0	usd
CY2023Q3	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax	-30200000	usd
	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax	42400000	usd
	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax	-19100000	usd
CY2023Q3	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	-112900000	usd
	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	154500000	usd
	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	-80600000	usd
CY2023Q3	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationTax	-300000	usd
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationTax	-300000	usd
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationTax	300000	usd
CY2023Q3	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax	-1200000	usd
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax	-1100000	usd
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax	1000000.0	usd
CY2023Q3	us-gaap	Other Comprehensive Income Foreign Currency Translation Gain Loss Arising During Period Tax OtherComprehensiveIncomeForeignCurrencyTranslationGainLossArisingDuringPeriodTax	-400000	usd
	us-gaap	Other Comprehensive Income Foreign Currency Translation Gain Loss Arising During Period Tax OtherComprehensiveIncomeForeignCurrencyTranslationGainLossArisingDuringPeriodTax	-4600000	usd
	us-gaap	Other Comprehensive Income Foreign Currency Translation Gain Loss Arising During Period Tax OtherComprehensiveIncomeForeignCurrencyTranslationGainLossArisingDuringPeriodTax	1700000	usd
CY2023Q3	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	-11300000	usd
CY2023Q3	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	2900000	usd
	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	7200000	usd
	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	7600000	usd
CY2023Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-128300000	usd
	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	137800000	usd
	aiz	Decrease To Equity From Acquisition Of Common Stock DecreaseToEquityFromAcquisitionOfCommonStock	88000000.0	usd
	us-gaap	Net Income Loss NetIncomeLoss	460000000.0	usd
CY2023Q3	us-gaap	Stockholders Equity StockholdersEquity	4490600000	usd
	us-gaap	Net Income Loss NetIncomeLoss	558900000	usd
	us-gaap	Net Income Loss NetIncomeLoss	460000000.0	usd
	us-gaap	Deferred Income Taxes And Tax Credits DeferredIncomeTaxesAndTaxCredits	219900000	usd
	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	159600000	usd
	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	141200000	usd
	us-gaap	Marketable Securities Gain Loss Excluding Other Than Temporary Impairments MarketableSecuritiesGainLossExcludingOtherThanTemporaryImpairments	-46700000	usd
	us-gaap	Marketable Securities Gain Loss Excluding Other Than Temporary Impairments MarketableSecuritiesGainLossExcludingOtherThanTemporaryImpairments	-49700000	usd
	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	0	usd
	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	100000	usd
	us-gaap	Share Based Compensation ShareBasedCompensation	58300000	usd
	us-gaap	Share Based Compensation ShareBasedCompensation	53600000	usd
	us-gaap	Restructuring Costs RestructuringCosts	200000	usd
	us-gaap	Restructuring Costs RestructuringCosts	18300000	usd
	aiz	Change In Insurance Policy Reserves And Expenses ChangeInInsurancePolicyReservesAndExpenses	1409800000	usd
	aiz	Change In Insurance Policy Reserves And Expenses ChangeInInsurancePolicyReservesAndExpenses	66900000	usd
	aiz	Change In Premiums And Accounts Receivable ChangeInPremiumsAndAccountsReceivable	-485700000	usd
	aiz	Change In Premiums And Accounts Receivable ChangeInPremiumsAndAccountsReceivable	-10400000	usd
	us-gaap	Increase Decrease In Reinsurance Recoverable IncreaseDecreaseInReinsuranceRecoverable	968200000	usd
	us-gaap	Increase Decrease In Reinsurance Recoverable IncreaseDecreaseInReinsuranceRecoverable	-330800000	usd
	us-gaap	Increase Decrease In Reinsurance Payables IncreaseDecreaseInReinsurancePayables	83500000	usd
	us-gaap	Increase Decrease In Funds Held Under Reinsurance Agreements IncreaseDecreaseInFundsHeldUnderReinsuranceAgreements	134300000	usd
	us-gaap	Increase Decrease In Funds Held Under Reinsurance Agreements IncreaseDecreaseInFundsHeldUnderReinsuranceAgreements	-36400000	usd
	aiz	Change In Deferred Acquisition Costs And Value Of Business Acquired ChangeInDeferredAcquisitionCostsAndValueOfBusinessAcquired	75000000.0	usd
	aiz	Change In Deferred Acquisition Costs And Value Of Business Acquired ChangeInDeferredAcquisitionCostsAndValueOfBusinessAcquired	68400000	usd
	us-gaap	Increase Decrease In Income Taxes IncreaseDecreaseInIncomeTaxes	-167300000	usd
	us-gaap	Increase Decrease In Income Taxes IncreaseDecreaseInIncomeTaxes	-45400000	usd
	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	387600000	usd
	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	83800000	usd
	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	51600000	usd
	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	8700000	usd
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	1229900000	usd
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	775500000	usd
	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	924600000	usd
	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	955700000	usd
	aiz	Proceeds From The Sale Of Equity Securities ProceedsFromTheSaleOfEquitySecurities	73800000	usd
	aiz	Proceeds From The Sale Of Equity Securities ProceedsFromTheSaleOfEquitySecurities	11100000	usd
	us-gaap	Proceeds From Sale Of Other Investments ProceedsFromSaleOfOtherInvestments	71000000.0	usd
	us-gaap	Proceeds From Sale Of Other Investments ProceedsFromSaleOfOtherInvestments	30000000.0	usd
CY2024Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	1813400000	usd
CY2023Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	1425300000	usd
CY2024Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	151500000	usd
CY2023Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	228800000	usd
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	677300000	usd
CY2023Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	38700000	usd
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	118400000	usd
CY2024Q3	us-gaap	Net Income Loss NetIncomeLoss	133800000	usd
CY2023Q3	us-gaap	Net Income Loss NetIncomeLoss	190100000	usd
	us-gaap	Net Income Loss NetIncomeLoss	558900000	usd
CY2024Q3	aiz	Realized Investment Gains Loss Relatedto Salesand Other RealizedInvestmentGainsLossRelatedtoSalesandOther	-8900000	usd
CY2023Q3	aiz	Realized Investment Gains Loss Relatedto Salesand Other RealizedInvestmentGainsLossRelatedtoSalesandOther	-18300000	usd
CY2023Q3	aiz	Investment Impairment Lossesincludedin Net Realized Gains Losses InvestmentImpairmentLossesincludedinNetRealizedGainsLosses	800000	usd
CY2024Q3	us-gaap	Gain Loss On Investments GainLossOnInvestments	-18300000	usd
CY2023Q3	us-gaap	Gain Loss On Investments GainLossOnInvestments	-19100000	usd
CY2024Q3	us-gaap	Equity Securities Without Readily Determinable Fair Value Upward Price Adjustment Annual Amount EquitySecuritiesWithoutReadilyDeterminableFairValueUpwardPriceAdjustmentAnnualAmount	2500000	usd
	us-gaap	Equity Securities Without Readily Determinable Fair Value Upward Price Adjustment Annual Amount EquitySecuritiesWithoutReadilyDeterminableFairValueUpwardPriceAdjustmentAnnualAmount	6600000	usd
CY2024Q3	us-gaap	Equity Securities Without Readily Determinable Fair Value Impairment Loss Annual Amount EquitySecuritiesWithoutReadilyDeterminableFairValueImpairmentLossAnnualAmount	9200000	usd
	us-gaap	Equity Securities Without Readily Determinable Fair Value Impairment Loss Annual Amount EquitySecuritiesWithoutReadilyDeterminableFairValueImpairmentLossAnnualAmount	20000000.0	usd
CY2024Q3	us-gaap	Equity Securities Fv Ni Realized Gain Loss EquitySecuritiesFvNiRealizedGainLoss	1400000	usd
CY2023Q3	us-gaap	Equity Securities Fv Ni Realized Gain Loss EquitySecuritiesFvNiRealizedGainLoss	100000	usd
CY2024Q2	us-gaap	Deferred Policy Acquisition Costs DeferredPolicyAcquisitionCosts	10041000000	usd
CY2023Q2	us-gaap	Deferred Policy Acquisition Costs DeferredPolicyAcquisitionCosts	9818500000	usd
CY2023Q4	us-gaap	Deferred Policy Acquisition Costs DeferredPolicyAcquisitionCosts	9967200000	usd
CY2024Q3	us-gaap	Deferred Policy Acquisition Costs Additions DeferredPolicyAcquisitionCostsAdditions	1005300000	usd
CY2023Q3	us-gaap	Deferred Policy Acquisition Costs Additions DeferredPolicyAcquisitionCostsAdditions	1090700000	usd
	us-gaap	Deferred Policy Acquisition Costs Additions DeferredPolicyAcquisitionCostsAdditions	3117100000	usd
CY2024Q3	us-gaap	Deferred Policy Acquisition Cost Amortization Expense DeferredPolicyAcquisitionCostAmortizationExpense	962500000	usd
CY2023Q3	us-gaap	Deferred Policy Acquisition Cost Amortization Expense DeferredPolicyAcquisitionCostAmortizationExpense	1005400000	usd
	us-gaap	Deferred Policy Acquisition Cost Amortization Expense DeferredPolicyAcquisitionCostAmortizationExpense	3000500000	usd
CY2024Q3	us-gaap	Deferred Policy Acquisition Costs DeferredPolicyAcquisitionCosts	10083800000	usd
CY2023Q3	us-gaap	Deferred Policy Acquisition Costs DeferredPolicyAcquisitionCosts	9903800000	usd
CY2024Q3	us-gaap	Deferred Policy Acquisition Costs DeferredPolicyAcquisitionCosts	10083800000	usd
CY2023Q4	us-gaap	Reinsurance Recoverable For Unpaid Claims And Claims Adjustments ReinsuranceRecoverableForUnpaidClaimsAndClaimsAdjustments	886600000	usd
CY2023Q4	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Net LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet	1102600000	usd
	us-gaap	Supplemental Information For Property Casualty Insurance Underwriters Current Year Claims And Claims Adjustment Expense SupplementalInformationForPropertyCasualtyInsuranceUnderwritersCurrentYearClaimsAndClaimsAdjustmentExpense	2194900000	usd
	us-gaap	Supplemental Information For Property Casualty Insurance Underwriters Prior Year Claims And Claims Adjustment Expense SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense	-98900000	usd
	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Incurred Claims1 LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1	2096000000	usd
	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Claims Paid Current Year1 LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidCurrentYear1	1315200000	usd
	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Claims Paid Prior Years1 LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidPriorYears1	570600000	usd
	us-gaap	Payments For Losses And Loss Adjustment Expense PaymentsForLossesAndLossAdjustmentExpense	1885800000	usd
CY2024Q3	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Net LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet	1312800000	usd
CY2024Q3	us-gaap	Reinsurance Recoverable For Unpaid Claims And Claims Adjustments ReinsuranceRecoverableForUnpaidClaimsAndClaimsAdjustments	1736200000	usd
CY2024Q3	us-gaap	Liability For Claims And Claims Adjustment Expense LiabilityForClaimsAndClaimsAdjustmentExpense	3049000000	usd
	us-gaap	Supplemental Information For Property Casualty Insurance Underwriters Prior Year Claims And Claims Adjustment Expense SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense	-98900000	usd
CY2024Q3	us-gaap	Other Investments OtherInvestments	501700000	usd
CY2023Q4	us-gaap	Other Investments OtherInvestments	499000000.0	usd
CY2024Q3	us-gaap	Investments Investments	8971200000	usd
CY2023Q4	us-gaap	Investments Investments	8220900000	usd
CY2024Q3	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	1813400000	usd
CY2023Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	1627400000	usd
CY2024Q3	aiz	Premiums And Accounts Receivable Allowance For Credit Loss PremiumsAndAccountsReceivableAllowanceForCreditLoss	6300000	usd
CY2023Q4	us-gaap	Reinsurance Recoverables Allowance ReinsuranceRecoverablesAllowance	4800000	usd
CY2023Q4	us-gaap	Funds Held Under Reinsurance Agreements Liability FundsHeldUnderReinsuranceAgreementsLiability	392700000	usd
CY2023Q4	us-gaap	Liabilities Liabilities	28825700000	usd
CY2024Q3	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		usd
CY2023Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		usd
CY2024Q3	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2023Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2023Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	800000000	shares
CY2024Q3	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	800000000	shares
CY2024Q3	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	53672292	shares
CY2023Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	54252083	shares
CY2024Q3	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	51376203	shares
CY2023Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	51955994	shares
CY2023Q4	us-gaap	Common Stock Value CommonStockValue	600000	usd
CY2023Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	1668500000	usd
CY2024Q3	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	4321500000	usd
CY2024Q3	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-627200000	usd
CY2023Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-765000000.0	usd
CY2024Q3	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	35332300000	usd
CY2023Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	33635200000	usd
CY2024Q3	us-gaap	Premiums Earned Net PremiumsEarnedNet	2417200000	usd
CY2023Q3	us-gaap	Premiums Earned Net PremiumsEarnedNet	2357300000	usd
	us-gaap	Premiums Earned Net PremiumsEarnedNet	7238300000	usd
CY2024Q3	us-gaap	Other Income OtherIncome	439100000	usd
CY2024Q3	us-gaap	Net Investment Income NetInvestmentIncome	129700000	usd
CY2024Q3	aiz	Investment Impairment Lossesincludedin Net Realized Gains Losses InvestmentImpairmentLossesincludedinNetRealizedGainsLosses	9400000	usd
	aiz	Investment Impairment Lossesincludedin Net Realized Gains Losses InvestmentImpairmentLossesincludedinNetRealizedGainsLosses	21200000	usd
	aiz	Investment Impairment Lossesincludedin Net Realized Gains Losses InvestmentImpairmentLossesincludedinNetRealizedGainsLosses	6400000	usd
CY2024Q3	us-gaap	Gain Loss On Investments GainLossOnInvestments	-18300000	usd
CY2023Q3	us-gaap	Revenues Revenues	2774100000	usd
	us-gaap	Revenues Revenues	8772700000	usd
	us-gaap	Revenues Revenues	8148500000	usd
CY2024Q3	us-gaap	Policyholder Benefits And Claims Incurred Net PolicyholderBenefitsAndClaimsIncurredNet	776800000	usd
CY2023Q3	us-gaap	Policyholder Benefits And Claims Incurred Net PolicyholderBenefitsAndClaimsIncurredNet	644600000	usd
	us-gaap	Policyholder Benefits And Claims Incurred Net PolicyholderBenefitsAndClaimsIncurredNet	2096000000	usd
	us-gaap	Policyholder Benefits And Claims Incurred Net PolicyholderBenefitsAndClaimsIncurredNet	1922700000	usd
CY2024Q3	aiz	Underwriting Selling General And Administrative Expense UnderwritingSellingGeneralAndAdministrativeExpense	2012700000	usd
CY2023Q3	aiz	Underwriting Selling General And Administrative Expense UnderwritingSellingGeneralAndAdministrativeExpense	1873700000	usd
	aiz	Underwriting Selling General And Administrative Expense UnderwritingSellingGeneralAndAdministrativeExpense	5919200000	usd
	aiz	Underwriting Selling General And Administrative Expense UnderwritingSellingGeneralAndAdministrativeExpense	5564500000	usd
CY2024Q3	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	0	usd
CY2023Q3	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	0	usd
	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	0	usd
	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	100000	usd
CY2023Q3	us-gaap	Benefits Losses And Expenses BenefitsLossesAndExpenses	2545300000	usd
	us-gaap	Benefits Losses And Expenses BenefitsLossesAndExpenses	8095400000	usd
	us-gaap	Benefits Losses And Expenses BenefitsLossesAndExpenses	7568300000	usd
CY2024Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	151500000	usd
CY2023Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	228800000	usd
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	677300000	usd
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	580200000	usd
CY2024Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	17700000	usd
CY2023Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	38700000	usd
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	118400000	usd
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	120200000	usd
CY2024Q3	us-gaap	Net Income Loss NetIncomeLoss	133800000	usd
CY2023Q3	us-gaap	Net Income Loss NetIncomeLoss	190100000	usd
	us-gaap	Net Income Loss NetIncomeLoss	558900000	usd
	us-gaap	Net Income Loss NetIncomeLoss	460000000.0	usd
CY2024Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.56
CY2023Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.55
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	10.66
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	8.58
CY2024Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.55
CY2023Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	3.54
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	10.60
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	8.55
CY2023Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	53535982	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	52411457	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	53591495	shares
CY2024Q3	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	260465	shares
CY2023Q3	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	209191	shares
	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	293417	shares
	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	232889	shares
CY2024Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	52464522	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	52704874	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	53824384	shares
CY2024Q3	us-gaap	Net Income Loss NetIncomeLoss	133800000	usd
	us-gaap	Net Income Loss NetIncomeLoss	558900000	usd
CY2024Q3	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax	56200000	usd
CY2024Q3	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	209700000	usd
CY2024Q3	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationTax	800000	usd
CY2024Q3	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax	3000000.0	usd
CY2024Q3	us-gaap	Other Comprehensive Income Foreign Currency Translation Gain Loss Arising During Period Tax OtherComprehensiveIncomeForeignCurrencyTranslationGainLossArisingDuringPeriodTax	-2800000	usd
CY2024Q3	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	15200000	usd
	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	-8400000	usd
	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	22400000	usd
CY2024Q3	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	700000	usd
CY2023Q3	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	700000	usd
	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	2000000.0	usd
	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	2000000.0	usd
CY2024Q3	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	2400000	usd
CY2024Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	225500000	usd
	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-64800000	usd
CY2024Q3	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	359300000	usd
CY2023Q3	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	61800000	usd
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	696700000	usd
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	395200000	usd
CY2024Q3	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	7500000	usd
CY2024Q3	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	23700000	usd
CY2024Q3	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.72
CY2024Q3	us-gaap	Dividends Common Stock DividendsCommonStock	37500000	usd
CY2024Q3	aiz	Decrease To Equity From Acquisition Of Common Stock DecreaseToEquityFromAcquisitionOfCommonStock	102000000.0	usd
CY2024Q3	us-gaap	Net Income Loss NetIncomeLoss	133800000	usd
CY2024Q3	us-gaap	Stockholders Equity StockholdersEquity	5255300000	usd
CY2023Q2	us-gaap	Stockholders Equity StockholdersEquity	4486000000	usd
CY2023Q3	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	7500000	usd
CY2023Q3	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	23900000	usd
CY2023Q3	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.70
CY2023Q3	us-gaap	Dividends Common Stock DividendsCommonStock	37100000	usd
	us-gaap	Equity Securities Fv Ni Realized Gain Loss EquitySecuritiesFvNiRealizedGainLoss	-2200000	usd
	us-gaap	Deferred Income Taxes And Tax Credits DeferredIncomeTaxesAndTaxCredits	-69100000	usd
	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2024
	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	30339
	dei	City Area Code CityAreaCode	770
	dei	Local Phone Number LocalPhoneNumber	763-1000
	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
CY2024Q3	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	1683300000	usd
CY2023Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	4028200000	usd
CY2024Q3	us-gaap	Treasury Stock Common Value TreasuryStockCommonValue	122800000	usd
CY2023Q4	us-gaap	Treasury Stock Common Value TreasuryStockCommonValue	122800000	usd
CY2024Q3	us-gaap	Interest Expense Debt InterestExpenseDebt	26700000	usd
	us-gaap	Interest Expense Debt InterestExpenseDebt	80200000	usd
	us-gaap	Interest Expense Debt InterestExpenseDebt	81200000	usd
CY2024Q3	us-gaap	Benefits Losses And Expenses BenefitsLossesAndExpenses	2816200000	usd
CY2024Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	52204057	shares
CY2023Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	53745173	shares
CY2023Q3	us-gaap	Net Income Loss NetIncomeLoss	190100000	usd
CY2024Q3	us-gaap	Equity Securities Fv Ni Unrealized Gain Loss EquitySecuritiesFvNiUnrealizedGainLoss	9800000	usd
CY2023Q3	us-gaap	Net Income Loss NetIncomeLoss	190100000	usd
CY2024Q3	us-gaap	Dividends Common Stock DividendsCommonStock	37500000	usd
CY2023Q3	us-gaap	Dividends Common Stock DividendsCommonStock	37100000	usd
CY2023Q3	us-gaap	Undistributed Earnings Diluted UndistributedEarningsDiluted	153000000.0	usd
	us-gaap	Undistributed Earnings UndistributedEarnings	444100000	usd
	us-gaap	Undistributed Earnings Diluted UndistributedEarningsDiluted	444100000	usd
CY2023Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	53535982	shares
CY2024Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	52464522	shares
CY2023Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	53745173	shares
CY2024Q3	us-gaap	Earnings Per Share Basic Distributed EarningsPerShareBasicDistributed	0.72
CY2024Q3	us-gaap	Earnings Per Share Basic Undistributed EarningsPerShareBasicUndistributed	1.84
CY2023Q3	us-gaap	Earnings Per Share Basic Undistributed EarningsPerShareBasicUndistributed	2.86
CY2024Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.56
CY2023Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.55
CY2024Q3	us-gaap	Earnings Per Share Diluted Distributed EarningsPerShareDilutedDistributed	0.71
CY2023Q3	us-gaap	Earnings Per Share Diluted Distributed EarningsPerShareDilutedDistributed	0.69
CY2024Q3	us-gaap	Earnings Per Share Diluted Undistributed EarningsPerShareDilutedUndistributed	1.84
CY2023Q3	us-gaap	Earnings Per Share Diluted Undistributed EarningsPerShareDilutedUndistributed	2.85
CY2024Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.55
CY2023Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	3.54
CY2023Q3	us-gaap	Restructuring And Related Cost Incurred Cost RestructuringAndRelatedCostIncurredCost	13200000	usd
	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2023Q4	us-gaap	Other Short Term Investments OtherShortTermInvestments	258100000	usd
CY2024Q3	us-gaap	Revenues Revenues	2967700000	usd
CY2023Q3	us-gaap	Interest Expense Debt InterestExpenseDebt	27000000.0	usd
CY2024Q2	us-gaap	Stockholders Equity StockholdersEquity	5004300000	usd
CY2024Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	225500000	usd
CY2023Q3	aiz	Decrease To Equity From Acquisition Of Common Stock DecreaseToEquityFromAcquisitionOfCommonStock	51500000	usd
CY2023Q3	us-gaap	Net Income Loss NetIncomeLoss	190100000	usd
CY2023Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-128300000	usd
CY2023Q3	us-gaap	Stockholders Equity StockholdersEquity	4490600000	usd
CY2023Q4	us-gaap	Stockholders Equity StockholdersEquity	4809500000	usd
	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	14800000	usd
	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	58300000	usd
	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	2.16
	us-gaap	Dividends Common Stock DividendsCommonStock	114800000	usd
	aiz	Decrease To Equity From Acquisition Of Common Stock DecreaseToEquityFromAcquisitionOfCommonStock	209200000	usd
	us-gaap	Net Income Loss NetIncomeLoss	558900000	usd
	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	137800000	usd
CY2024Q3	us-gaap	Stockholders Equity StockholdersEquity	5255300000	usd
CY2022Q4	us-gaap	Stockholders Equity StockholdersEquity	4228700000	usd
	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	14900000	usd
	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	53600000	usd
	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	2.10
	us-gaap	Dividends Common Stock DividendsCommonStock	113800000	usd
	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-64800000	usd
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	aiz	Increase Decrease In Commissions Payable IncreaseDecreaseInCommissionsPayable	-39300000	usd
	us-gaap	Increase Decrease In Reinsurance Payables IncreaseDecreaseInReinsurancePayables	-77000000.0	usd
	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	384200000	usd
	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	199200000	usd
	us-gaap	Proceeds From Sale And Collection Of Mortgage Notes Receivable ProceedsFromSaleAndCollectionOfMortgageNotesReceivable	35400000	usd
	us-gaap	Proceeds From Sale And Collection Of Mortgage Notes Receivable ProceedsFromSaleAndCollectionOfMortgageNotesReceivable	15400000	usd
	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	1822900000	usd
	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	1495600000	usd
	aiz	Payments To Acquire Equity Securities PaymentsToAcquireEquitySecurities	55400000	usd
	aiz	Payments To Acquire Equity Securities PaymentsToAcquireEquitySecurities	3400000	usd
	us-gaap	Payments To Acquire Mortgage Notes Receivable PaymentsToAcquireMortgageNotesReceivable	38100000	usd
	us-gaap	Payments To Acquire Mortgage Notes Receivable PaymentsToAcquireMortgageNotesReceivable	44400000	usd
	us-gaap	Payments To Acquire Other Investments PaymentsToAcquireOtherInvestments	66800000	usd
	us-gaap	Payments To Acquire Other Investments PaymentsToAcquireOtherInvestments	37000000.0	usd
	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	153300000	usd
	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	148200000	usd
	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	12900000	usd
	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	300000	usd
	us-gaap	Payments For Proceeds From Short Term Investments PaymentsForProceedsFromShortTermInvestments	68400000	usd
	us-gaap	Payments For Proceeds From Short Term Investments PaymentsForProceedsFromShortTermInvestments	124000000.0	usd
	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	0	usd
	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-700000	usd
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-728800000	usd
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-640800000	usd
	us-gaap	Proceeds From Debt Net Of Issuance Costs ProceedsFromDebtNetOfIssuanceCosts	0	usd
	us-gaap	Proceeds From Debt Net Of Issuance Costs ProceedsFromDebtNetOfIssuanceCosts	173200000	usd
	us-gaap	Repayments Of Debt RepaymentsOfDebt	0	usd
	us-gaap	Repayments Of Debt RepaymentsOfDebt	225000000.0	usd
	us-gaap	Payment For Contingent Consideration Liability Financing Activities PaymentForContingentConsiderationLiabilityFinancingActivities	0	usd
	us-gaap	Payment For Contingent Consideration Liability Financing Activities PaymentForContingentConsiderationLiabilityFinancingActivities	2500000	usd
	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	187100000	usd
	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	67100000	usd
	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	114800000	usd
	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	113800000	usd
	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	15900000	usd
	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	6700000	usd
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-317800000	usd
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-241900000	usd
	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	2700000	usd
	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	-4200000	usd
	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	186000000.0	usd
	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-111400000	usd
CY2023Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	1627400000	usd
CY2022Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	1536700000	usd
	us-gaap	Nature Of Operations NatureOfOperations	Nature of Operations <div style="margin-bottom:6pt;text-indent:22.5pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Assurant, Inc. (the “Company”) is a leading global business services company that supports, protects and connects major consumer purchases. The Company supports the advancement of the connected world by partnering with the world’s leading brands to develop innovative solutions and to deliver an enhanced customer experience. The Company operates in North America, Latin America, Europe and Asia Pacific through two operating segments: Global Lifestyle and Global Housing. Through its Global Lifestyle segment, the Company provides mobile device solutions, extended service contracts and related services for consumer electronics and appliances, and credit and other insurance products (referred to as “Connected Living”); and vehicle protection services, commercial equipment services and other related services (referred to as “Global Automotive”). Through its Global Housing segment, the Company provides lender-placed homeowners, manufactured housing and flood insurance, as well as voluntary manufactured housing, condominium and homeowners insurance (referred to as “Homeowners”); and renters insurance and other products (referred to as “Renters and Other”).</span></div><div style="margin-bottom:6pt;text-indent:22.5pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">The Company’s common stock is traded on the New York Stock Exchange under the symbol “AIZ”.</span></div>
	us-gaap	Number Of Operating Segments NumberOfOperatingSegments	2	segment
	us-gaap	Basis Of Accounting BasisOfAccounting	Basis of Presentation <div style="margin-bottom:6pt;text-indent:22.5pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">The accompanying unaudited interim consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”) for interim financial information. Accordingly, these statements do not include all of the information and notes required by GAAP for complete financial statements. </span></div><div style="margin-bottom:6pt;text-indent:22.5pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">The consolidated balance sheet as of September 30, 2024, the consolidated statements of operations, consolidated statements of comprehensive income and consolidated statements of changes in equity for the three and nine months ended September 30, 2024 and 2023 and the consolidated statements of cash flows for the nine months ended September 30, 2024 and 2023 are unaudited. In the opinion of management, the interim data includes all normal recurring adjustments necessary for a fair statement of the results for the interim periods. The unaudited interim consolidated financial statements include the accounts of the Company and all of its wholly owned subsidiaries. All inter-company transactions and balances are eliminated in consolidation. </span></div><div style="margin-bottom:6pt;text-indent:22.5pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Operating results for the three and nine months ended September 30, 2024 are not necessarily indicative of the results that may be expected for the year ending December 31, 2024. The accompanying unaudited interim consolidated financial statements should be read in conjunction with the audited consolidated financial statements and related notes included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2023. </span></div><div style="margin-bottom:6pt"><span id="i6adb8fdbf378466687d1db607813ba63"></span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-style:italic;font-weight:700;line-height:120%">Restricted Cash</span></div><div style="margin-bottom:6pt;text-indent:22.5pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Restricted cash and cash equivalents of $115.4 million and $43.6 million as of September 30, 2024 and December 31, 2023, respectively, principally related to cash deposits involving insurance programs with restrictions as to withdrawal and use, are classified within cash and cash equivalents in the consolidated balance sheets.</span></div>
CY2024Q3	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	115400000	usd
CY2023Q4	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	43600000	usd
	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	2	segment
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	580200000	usd
CY2024Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	17700000	usd
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	120200000	usd
	us-gaap	Net Income Loss NetIncomeLoss	460000000.0	usd
CY2024Q3	us-gaap	Assets Assets	35332300000	usd
CY2023Q4	us-gaap	Assets Assets	33635200000	usd
CY2024Q3	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	7766400000	usd
CY2024Q3	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss DebtSecuritiesAvailableForSaleAllowanceForCreditLoss	0	usd
CY2024Q3	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	146200000	usd
CY2024Q3	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	316500000	usd
CY2024Q3	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	7596100000	usd
CY2023Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	7292400000	usd
CY2023Q4	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss DebtSecuritiesAvailableForSaleAllowanceForCreditLoss	0	usd
CY2023Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	81700000	usd
CY2023Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	462000000.0	usd
CY2023Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	6912100000	usd
CY2024Q3	us-gaap	Available For Sale Securities Debt Maturities Within One Year Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost	202600000	usd
CY2024Q3	us-gaap	Available For Sale Securities Debt Maturities Within One Year Fair Value AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue	202100000	usd
CY2024Q3	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost	1488100000	usd
CY2024Q3	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue	1492800000	usd
CY2024Q3	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost	2980700000	usd
CY2024Q3	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue	2969800000	usd
CY2024Q3	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost	1111800000	usd
CY2024Q3	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue	1011800000	usd
CY2024Q3	aiz	Available For Sale Securities Debt Maturities Contractual Maturity Total AvailableForSaleSecuritiesDebtMaturitiesContractualMaturityTotal	5783200000	usd
CY2024Q3	aiz	Available For Sale Securities Debt Maturities Contractual Maturity Fair Value Total AvailableForSaleSecuritiesDebtMaturitiesContractualMaturityFairValueTotal	5676500000	usd
CY2024Q3	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	7766400000	usd
CY2024Q3	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	7596100000	usd
	aiz	Realized Investment Gains Loss Relatedto Salesand Other RealizedInvestmentGainsLossRelatedtoSalesandOther	-25500000	usd
	aiz	Realized Investment Gains Loss Relatedto Salesand Other RealizedInvestmentGainsLossRelatedtoSalesandOther	-43300000	usd
CY2024Q3	aiz	Investment Impairment Lossesincludedin Net Realized Gains Losses InvestmentImpairmentLossesincludedinNetRealizedGainsLosses	9400000	usd
	aiz	Investment Impairment Lossesincludedin Net Realized Gains Losses InvestmentImpairmentLossesincludedinNetRealizedGainsLosses	21200000	usd
	aiz	Investment Impairment Lossesincludedin Net Realized Gains Losses InvestmentImpairmentLossesincludedinNetRealizedGainsLosses	6400000	usd
	us-gaap	Gain Loss On Investments GainLossOnInvestments	-46700000	usd
	us-gaap	Gain Loss On Investments GainLossOnInvestments	-49700000	usd
CY2023Q3	us-gaap	Equity Securities Without Readily Determinable Fair Value Upward Price Adjustment Annual Amount EquitySecuritiesWithoutReadilyDeterminableFairValueUpwardPriceAdjustmentAnnualAmount	200000	usd
	us-gaap	Equity Securities Without Readily Determinable Fair Value Upward Price Adjustment Annual Amount EquitySecuritiesWithoutReadilyDeterminableFairValueUpwardPriceAdjustmentAnnualAmount	600000	usd
CY2023Q3	us-gaap	Equity Securities Without Readily Determinable Fair Value Impairment Loss Annual Amount EquitySecuritiesWithoutReadilyDeterminableFairValueImpairmentLossAnnualAmount	0	usd
	us-gaap	Equity Securities Without Readily Determinable Fair Value Impairment Loss Annual Amount EquitySecuritiesWithoutReadilyDeterminableFairValueImpairmentLossAnnualAmount	3500000	usd
CY2024Q3	us-gaap	Equity Securities Fv Ni Gain Loss EquitySecuritiesFvNiGainLoss	11200000	usd
CY2023Q3	us-gaap	Equity Securities Fv Ni Gain Loss EquitySecuritiesFvNiGainLoss	-3000000.0	usd
	us-gaap	Equity Securities Fv Ni Gain Loss EquitySecuritiesFvNiGainLoss	21300000	usd
	us-gaap	Equity Securities Fv Ni Gain Loss EquitySecuritiesFvNiGainLoss	-15900000	usd
	us-gaap	Equity Securities Fv Ni Realized Gain Loss EquitySecuritiesFvNiRealizedGainLoss	6500000	usd
CY2023Q3	us-gaap	Equity Securities Fv Ni Unrealized Gain Loss EquitySecuritiesFvNiUnrealizedGainLoss	-3100000	usd
	us-gaap	Equity Securities Fv Ni Unrealized Gain Loss EquitySecuritiesFvNiUnrealizedGainLoss	14800000	usd
	us-gaap	Equity Securities Fv Ni Unrealized Gain Loss EquitySecuritiesFvNiUnrealizedGainLoss	-13700000	usd
CY2024Q3	aiz	Equity Securities Without Readily Determinable Fair Value Initial Cost EquitySecuritiesWithoutReadilyDeterminableFairValueInitialCost	72800000	usd
CY2023Q4	aiz	Equity Securities Without Readily Determinable Fair Value Initial Cost EquitySecuritiesWithoutReadilyDeterminableFairValueInitialCost	86800000	usd
CY2024Q3	us-gaap	Equity Securities Without Readily Determinable Fair Value Upward Price Adjustment Cumulative Amount EquitySecuritiesWithoutReadilyDeterminableFairValueUpwardPriceAdjustmentCumulativeAmount	57700000	usd
CY2023Q4	us-gaap	Equity Securities Without Readily Determinable Fair Value Upward Price Adjustment Cumulative Amount EquitySecuritiesWithoutReadilyDeterminableFairValueUpwardPriceAdjustmentCumulativeAmount	51100000	usd
CY2024Q3	aiz	Equity Securities Without Readily Determinable Fair Value Downward Price Adjustment And Impairment Loss Cumulative Amount EquitySecuritiesWithoutReadilyDeterminableFairValueDownwardPriceAdjustmentAndImpairmentLossCumulativeAmount	21400000	usd
CY2023Q4	aiz	Equity Securities Without Readily Determinable Fair Value Downward Price Adjustment And Impairment Loss Cumulative Amount EquitySecuritiesWithoutReadilyDeterminableFairValueDownwardPriceAdjustmentAndImpairmentLossCumulativeAmount	17900000	usd
CY2024Q3	us-gaap	Equity Securities Without Readily Determinable Fair Value Amount EquitySecuritiesWithoutReadilyDeterminableFairValueAmount	109100000	usd
CY2023Q4	us-gaap	Equity Securities Without Readily Determinable Fair Value Amount EquitySecuritiesWithoutReadilyDeterminableFairValueAmount	120000000.0	usd
CY2024Q3	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months	478200000	usd
CY2024Q3	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	20100000	usd
CY2024Q3	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger	2523900000	usd
CY2024Q3	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	296400000	usd
CY2024Q3	us-gaap	Debt Securities Available For Sale Unrealized Loss Position DebtSecuritiesAvailableForSaleUnrealizedLossPosition	3002100000	usd
CY2024Q3	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Accumulated Loss DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss	316500000	usd
CY2023Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months	766500000	usd
CY2023Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	35900000	usd
CY2023Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger	3618900000	usd
CY2023Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	426100000	usd
CY2023Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position DebtSecuritiesAvailableForSaleUnrealizedLossPosition	4385400000	usd
CY2023Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Accumulated Loss DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss	462000000.0	usd
CY2024Q3	aiz	Available For Sale Securities Gross Unrealized Losses Percentage AvailableForSaleSecuritiesGrossUnrealizedLossesPercentage	0.11
CY2023Q4	aiz	Available For Sale Securities Gross Unrealized Losses Percentage AvailableForSaleSecuritiesGrossUnrealizedLossesPercentage	0.11
CY2024Q3	aiz	Available For Sale Securities Continuous Unrealized Loss Position Less Than12 Months Aggregate Losses Percentage AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLossesPercentage	0.06
CY2023Q4	aiz	Available For Sale Securities Continuous Unrealized Loss Position Less Than12 Months Aggregate Losses Percentage AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLossesPercentage	0.08
CY2024Q3	aiz	Number Of Available For Sale Securities Comprising Gross Unrealized Loss NumberOfAvailableForSaleSecuritiesComprisingGrossUnrealizedLoss	2282	investment
CY2023Q4	aiz	Number Of Available For Sale Securities Comprising Gross Unrealized Loss NumberOfAvailableForSaleSecuritiesComprisingGrossUnrealizedLoss	3096	investment
	aiz	Approximate Percentage Outstanding Principal Balance Of Commercial Mortgage Loans ApproximatePercentageOutstandingPrincipalBalanceOfCommercialMortgageLoans	0.35
	us-gaap	Deferred Policy Acquisition Costs Text Block1 DeferredPolicyAcquisitionCostsTextBlock1	Deferred Acquisition Costs<div style="margin-bottom:6pt;text-indent:22.5pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">The following table discloses information about deferred acquisition costs as of the dates indicated:</span></div><div style="margin-bottom:6pt"><table style="border-collapse:collapse;display:inline-table;margin-bottom:5pt;vertical-align:text-bottom;width:100.000%"><tr><td style="width:1.0%"></td><td style="width:31.063%"></td><td style="width:0.1%"></td><td style="width:1.0%"></td><td style="width:15.420%"></td><td style="width:0.1%"></td><td style="width:0.1%"></td><td style="width:0.384%"></td><td style="width:0.1%"></td><td style="width:1.0%"></td><td style="width:15.420%"></td><td style="width:0.1%"></td><td style="width:0.1%"></td><td style="width:0.384%"></td><td style="width:0.1%"></td><td style="width:1.0%"></td><td style="width:15.420%"></td><td style="width:0.1%"></td><td style="width:0.1%"></td><td style="width:0.384%"></td><td style="width:0.1%"></td><td style="width:1.0%"></td><td style="width:15.425%"></td><td style="width:0.1%"></td></tr><tr><td colspan="3" style="padding:0 1pt"></td><td colspan="9" style="padding:2px 1pt;text-align:center;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:700;line-height:120%">For the Three Months Ended September 30,</span></td><td colspan="3" style="padding:0 1pt"></td><td colspan="9" style="padding:2px 1pt;text-align:center;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:700;line-height:120%">For the Nine Months Ended September 30,</span></td></tr><tr><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:400;line-height:120%"> </span></td><td colspan="3" style="border-top:1pt solid #000;padding:2px 1pt;text-align:center;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:700;line-height:120%">2024</span></td><td colspan="3" style="border-top:1pt solid #000;padding:0 1pt"></td><td colspan="3" style="border-top:1pt solid #000;padding:2px 1pt;text-align:center;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:700;line-height:120%">2023</span></td><td colspan="3" style="padding:0 1pt"></td><td colspan="3" style="border-top:1pt solid #000;padding:2px 1pt;text-align:center;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:700;line-height:120%">2024</span></td><td colspan="3" style="border-top:1pt solid #000;padding:0 1pt"></td><td colspan="3" style="border-top:1pt solid #000;padding:2px 1pt;text-align:center;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:700;line-height:120%">2023</span></td></tr><tr><td colspan="3" style="background-color:#cceeff;padding:2px 1pt;text-align:left;vertical-align:top"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Beginning balance</span></td><td style="background-color:#cceeff;border-top:1pt solid #000000;padding:2px 0 2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">$</span></td><td style="background-color:#cceeff;border-top:1pt solid #000000;padding:2px 0;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">10,041.0 </span></td><td style="background-color:#cceeff;border-top:1pt solid #000000;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"></td><td colspan="3" style="background-color:#cceeff;padding:0 1pt"></td><td style="background-color:#cceeff;border-top:1pt solid #000000;padding:2px 0 2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">$</span></td><td style="background-color:#cceeff;border-top:1pt solid #000000;padding:2px 0;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">9,818.5 </span></td><td style="background-color:#cceeff;border-top:1pt solid #000000;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"></td><td colspan="3" style="background-color:#cceeff;padding:0 1pt"></td><td style="background-color:#cceeff;border-top:1pt solid #000000;padding:2px 0 2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">$</span></td><td style="background-color:#cceeff;border-top:1pt solid #000000;padding:2px 0;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">9,967.2 </span></td><td style="background-color:#cceeff;border-top:1pt solid #000000;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"></td><td colspan="3" style="background-color:#cceeff;padding:0 1pt"></td><td style="background-color:#cceeff;border-top:1pt solid #000000;padding:2px 0 2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">$</span></td><td style="background-color:#cceeff;border-top:1pt solid #000000;padding:2px 0;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">9,677.1 </span></td><td style="background-color:#cceeff;border-top:1pt solid #000000;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"></td></tr><tr><td colspan="3" style="padding:2px 1pt 2px 19pt;text-align:left;vertical-align:top"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Costs deferred</span></td><td colspan="2" style="padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">1,005.3 </span></td><td style="padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"></td><td colspan="3" style="padding:0 1pt"></td><td colspan="2" style="padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">1,090.7 </span></td><td style="padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"></td><td colspan="3" style="padding:0 1pt"></td><td colspan="2" style="padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">3,117.1 </span></td><td style="padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"></td><td colspan="3" style="padding:0 1pt"></td><td colspan="2" style="padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">3,249.9 </span></td><td style="padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"></td></tr><tr><td colspan="3" style="background-color:#cceeff;padding:2px 1pt 2px 19pt;text-align:left;vertical-align:top"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Amortization</span></td><td colspan="2" style="background-color:#cceeff;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">(962.5)</span></td><td style="background-color:#cceeff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"></td><td colspan="3" style="background-color:#cceeff;padding:0 1pt"></td><td colspan="2" style="background-color:#cceeff;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">(1,005.4)</span></td><td style="background-color:#cceeff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"></td><td colspan="3" style="background-color:#cceeff;padding:0 1pt"></td><td colspan="2" style="background-color:#cceeff;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">(3,000.5)</span></td><td style="background-color:#cceeff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"></td><td colspan="3" style="background-color:#cceeff;padding:0 1pt"></td><td colspan="2" style="background-color:#cceeff;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">(3,023.2)</span></td><td style="background-color:#cceeff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"></td></tr><tr><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:top"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Ending balance</span></td><td style="border-bottom:3pt double #000;border-top:1pt solid #000;padding:2px 0 2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">$</span></td><td style="border-bottom:3pt double #000;border-top:1pt solid #000;padding:2px 0;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">10,083.8 </span></td><td style="border-bottom:3pt double #000;border-top:1pt solid #000;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"></td><td colspan="3" style="padding:0 1pt"></td><td style="border-bottom:3pt double #000;border-top:1pt solid #000;padding:2px 0 2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">$</span></td><td style="border-bottom:3pt double #000;border-top:1pt solid #000;padding:2px 0;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">9,903.8 </span></td><td style="border-bottom:3pt double #000;border-top:1pt solid #000;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"></td><td colspan="3" style="padding:0 1pt"></td><td style="border-bottom:3pt double #000000;border-top:1pt solid #000000;padding:2px 0 2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">$</span></td><td style="border-bottom:3pt double #000000;border-top:1pt solid #000000;padding:2px 0;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">10,083.8 </span></td><td style="border-bottom:3pt double #000000;border-top:1pt solid #000000;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"></td><td colspan="3" style="padding:0 1pt"></td><td style="border-bottom:3pt double #000000;border-top:1pt solid #000000;padding:2px 0 2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">$</span></td><td style="border-bottom:3pt double #000000;border-top:1pt solid #000000;padding:2px 0;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">9,903.8 </span></td><td style="border-bottom:3pt double #000000;border-top:1pt solid #000000;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"></td></tr></table></div>
CY2022Q4	us-gaap	Deferred Policy Acquisition Costs DeferredPolicyAcquisitionCosts	9677100000	usd
	us-gaap	Deferred Policy Acquisition Costs Additions DeferredPolicyAcquisitionCostsAdditions	3249900000	usd
	us-gaap	Deferred Policy Acquisition Cost Amortization Expense DeferredPolicyAcquisitionCostAmortizationExpense	3023200000	usd
CY2023Q3	us-gaap	Deferred Policy Acquisition Costs DeferredPolicyAcquisitionCosts	9903800000	usd
	us-gaap	Schedule Of Liability For Unpaid Claims And Claims Adjustment Expense ScheduleOfLiabilityForUnpaidClaimsAndClaimsAdjustmentExpense	<div style="margin-bottom:6pt;text-indent:22.5pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">The following table provides a roll forward of the Company’s beginning and ending claims and benefits payable balances. Claims and benefits payable is the liability for unpaid loss and loss adjustment expenses and is comprised of case and incurred but not reported (“IBNR”) reserves.</span></div><div style="margin-bottom:6pt;text-indent:22.5pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Since unpaid loss and loss adjustment expenses are estimates, the Company’s actual losses incurred may be more or less than the Company’s previously developed estimates, which is referred to as either unfavorable or favorable development, respectively.</span></div><div style="margin-bottom:6pt;text-indent:22.5pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">The best estimate of ultimate loss and loss adjustment expense is generally selected from a blend of methods that are applied consistently each period. There have been no significant changes in the methodologies and assumptions utilized in estimating the liability for unpaid loss and loss adjustment expenses for any of the periods presented. </span></div><div style="margin-bottom:6pt;text-align:center"><table style="border-collapse:collapse;display:inline-table;margin-bottom:5pt;vertical-align:text-bottom;width:100.000%"><tr><td style="width:1.0%"></td><td style="width:68.929%"></td><td style="width:0.1%"></td><td style="width:1.0%"></td><td style="width:13.519%"></td><td style="width:0.1%"></td><td style="width:0.1%"></td><td style="width:0.530%"></td><td style="width:0.1%"></td><td style="width:1.0%"></td><td style="width:13.522%"></td><td style="width:0.1%"></td></tr><tr><td colspan="3" style="padding:0 1pt"></td><td colspan="9" style="padding:2px 1pt;text-align:center;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:700;line-height:120%">For the Nine Months Ended September 30,</span></td></tr><tr><td colspan="3" style="padding:0 1pt"></td><td colspan="3" style="border-top:1pt solid #000000;padding:2px 1pt;text-align:center;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:700;line-height:120%">2024</span></td><td colspan="3" style="border-top:1pt solid #000000;padding:0 1pt"></td><td colspan="3" style="border-top:1pt solid #000000;padding:2px 1pt;text-align:center;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:700;line-height:120%">2023</span></td></tr><tr><td colspan="3" style="background-color:#cceeff;padding:2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Claims and benefits payable, at beginning of period</span></td><td style="background-color:#cceeff;border-top:1pt solid #000000;padding:2px 0 2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">$</span></td><td style="background-color:#cceeff;border-top:1pt solid #000000;padding:2px 0;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">1,989.2 </span></td><td style="background-color:#cceeff;border-top:1pt solid #000000;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"></td><td colspan="3" style="background-color:#cceeff;padding:0 1pt"></td><td style="background-color:#cceeff;border-top:1pt solid #000000;padding:2px 0 2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">$</span></td><td style="background-color:#cceeff;border-top:1pt solid #000000;padding:2px 0;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">2,210.0 </span></td><td style="background-color:#cceeff;border-top:1pt solid #000000;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"></td></tr><tr><td colspan="3" style="background-color:#ffffff;padding:2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Less: Reinsurance ceded and other</span></td><td colspan="2" style="background-color:#ffffff;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">(886.6)</span></td><td style="background-color:#ffffff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"></td><td colspan="3" style="background-color:#ffffff;padding:0 1pt"></td><td colspan="2" style="background-color:#ffffff;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">(1,228.8)</span></td><td style="background-color:#ffffff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"></td></tr><tr><td colspan="3" style="background-color:#cceeff;padding:2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Net claims and benefits payable, at beginning of period</span></td><td colspan="2" style="background-color:#cceeff;border-top:1pt solid #000000;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">1,102.6 </span></td><td style="background-color:#cceeff;border-top:1pt solid #000000;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"></td><td colspan="3" style="background-color:#cceeff;padding:0 1pt"></td><td colspan="2" style="background-color:#cceeff;border-top:1pt solid #000000;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">981.2 </span></td><td style="background-color:#cceeff;border-top:1pt solid #000000;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"></td></tr><tr><td colspan="3" style="background-color:#ffffff;padding:2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Incurred losses and loss adjustment expenses related to:</span></td><td colspan="3" style="background-color:#ffffff;border-top:1pt solid #000000;padding:0 1pt"></td><td colspan="3" style="background-color:#ffffff;padding:0 1pt"></td><td colspan="3" style="background-color:#ffffff;border-top:1pt solid #000000;padding:0 1pt"></td></tr><tr><td colspan="3" style="background-color:#cceeff;padding:2px 1pt 2px 19pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Current year</span></td><td colspan="2" style="background-color:#cceeff;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">2,194.9 </span></td><td style="background-color:#cceeff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"></td><td colspan="3" style="background-color:#cceeff;padding:0 1pt"></td><td colspan="2" style="background-color:#cceeff;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">1,953.4 </span></td><td style="background-color:#cceeff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"></td></tr><tr><td colspan="3" style="background-color:#ffffff;padding:2px 1pt 2px 19pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Prior years</span></td><td colspan="2" style="background-color:#ffffff;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">(98.9)</span></td><td style="background-color:#ffffff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"></td><td colspan="3" style="background-color:#ffffff;padding:0 1pt"></td><td colspan="2" style="background-color:#ffffff;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">(30.7)</span></td><td style="background-color:#ffffff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"></td></tr><tr><td colspan="3" style="background-color:#cceeff;padding:2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Total incurred losses and loss adjustment expenses</span></td><td colspan="2" style="background-color:#cceeff;border-top:1pt solid #000000;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">2,096.0 </span></td><td style="background-color:#cceeff;border-top:1pt solid #000000;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"></td><td colspan="3" style="background-color:#cceeff;padding:0 1pt"></td><td colspan="2" style="background-color:#cceeff;border-top:1pt solid #000000;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">1,922.7 </span></td><td style="background-color:#cceeff;border-top:1pt solid #000000;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"></td></tr><tr><td colspan="3" style="background-color:#ffffff;padding:2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Paid losses and loss adjustment expenses related to:</span></td><td colspan="3" style="background-color:#ffffff;border-top:1pt solid #000000;padding:0 1pt"></td><td colspan="3" style="background-color:#ffffff;padding:0 1pt"></td><td colspan="3" style="background-color:#ffffff;border-top:1pt solid #000000;padding:0 1pt"></td></tr><tr><td colspan="3" style="background-color:#cceeff;padding:2px 1pt 2px 19pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Current year</span></td><td colspan="2" style="background-color:#cceeff;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">1,315.2 </span></td><td style="background-color:#cceeff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"></td><td colspan="3" style="background-color:#cceeff;padding:0 1pt"></td><td colspan="2" style="background-color:#cceeff;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">1,250.8 </span></td><td style="background-color:#cceeff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"></td></tr><tr><td colspan="3" style="background-color:#ffffff;padding:2px 1pt 2px 19pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Prior years</span></td><td colspan="2" style="background-color:#ffffff;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">570.6 </span></td><td style="background-color:#ffffff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"></td><td colspan="3" style="background-color:#ffffff;padding:0 1pt"></td><td colspan="2" style="background-color:#ffffff;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">511.8 </span></td><td style="background-color:#ffffff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"></td></tr><tr><td colspan="3" style="background-color:#cceeff;padding:2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Total paid losses and loss adjustment expenses</span></td><td colspan="2" style="background-color:#cceeff;border-top:1pt solid #000000;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">1,885.8 </span></td><td style="background-color:#cceeff;border-top:1pt solid #000000;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"></td><td colspan="3" style="background-color:#cceeff;padding:0 1pt"></td><td colspan="2" style="background-color:#cceeff;border-top:1pt solid #000000;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">1,762.6 </span></td><td style="background-color:#cceeff;border-top:1pt solid #000000;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"></td></tr><tr><td colspan="3" style="background-color:#ffffff;padding:2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Net claims and benefits payable, at end of period</span></td><td colspan="2" style="background-color:#ffffff;border-top:1pt solid #000000;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">1,312.8 </span></td><td style="background-color:#ffffff;border-top:1pt solid #000000;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"></td><td colspan="3" style="background-color:#ffffff;padding:0 1pt"></td><td colspan="2" style="background-color:#ffffff;border-top:1pt solid #000000;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">1,141.3 </span></td><td style="background-color:#ffffff;border-top:1pt solid #000000;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"></td></tr><tr><td colspan="3" style="background-color:#cceeff;padding:2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Plus: Reinsurance ceded and other (1) </span></td><td colspan="2" style="background-color:#cceeff;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">1,736.2 </span></td><td style="background-color:#cceeff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"></td><td colspan="3" style="background-color:#cceeff;padding:0 1pt"></td><td colspan="2" style="background-color:#cceeff;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">869.5 </span></td><td style="background-color:#cceeff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"></td></tr><tr><td colspan="3" style="background-color:#ffffff;padding:2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Claims and benefits payable, at end of period (1)</span></td><td style="background-color:#ffffff;border-bottom:3pt double #000000;border-top:1pt solid #000000;padding:2px 0 2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">$</span></td><td style="background-color:#ffffff;border-bottom:3pt double #000000;border-top:1pt solid #000000;padding:2px 0;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">3,049.0 </span></td><td style="background-color:#ffffff;border-bottom:3pt double #000000;border-top:1pt solid #000000;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"></td><td colspan="3" style="background-color:#ffffff;padding:0 1pt"></td><td style="background-color:#ffffff;border-bottom:3pt double #000000;border-top:1pt solid #000000;padding:2px 0 2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">$</span></td><td style="background-color:#ffffff;border-bottom:3pt double #000000;border-top:1pt solid #000000;padding:2px 0;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">2,010.8 </span></td><td style="background-color:#ffffff;border-bottom:3pt double #000000;border-top:1pt solid #000000;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"></td></tr></table></div><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:400;line-height:120%">(1)</span>Includes reinsurance recoverables and claims and benefits payable of $905.6 million and $104.9 million as of September 30, 2024 and 2023, respectively, which was ceded to the U.S. government. The Company acts as an administrator for the U.S. government under the voluntary National Flood Insurance Program.
CY2023Q4	us-gaap	Liability For Claims And Claims Adjustment Expense LiabilityForClaimsAndClaimsAdjustmentExpense	1989200000	usd
CY2022Q4	us-gaap	Liability For Claims And Claims Adjustment Expense LiabilityForClaimsAndClaimsAdjustmentExpense	2210000000	usd
CY2022Q4	us-gaap	Reinsurance Recoverable For Unpaid Claims And Claims Adjustments ReinsuranceRecoverableForUnpaidClaimsAndClaimsAdjustments	1228800000	usd
CY2022Q4	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Net LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet	981200000	usd
	us-gaap	Supplemental Information For Property Casualty Insurance Underwriters Current Year Claims And Claims Adjustment Expense SupplementalInformationForPropertyCasualtyInsuranceUnderwritersCurrentYearClaimsAndClaimsAdjustmentExpense	1953400000	usd
	us-gaap	Supplemental Information For Property Casualty Insurance Underwriters Prior Year Claims And Claims Adjustment Expense SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense	-30700000	usd
	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Incurred Claims1 LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1	1922700000	usd
	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Claims Paid Current Year1 LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidCurrentYear1	1250800000	usd
	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Claims Paid Prior Years1 LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidPriorYears1	511800000	usd
	us-gaap	Payments For Losses And Loss Adjustment Expense PaymentsForLossesAndLossAdjustmentExpense	1762600000	usd
CY2023Q3	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Net LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet	1141300000	usd
CY2023Q3	us-gaap	Reinsurance Recoverable For Unpaid Claims And Claims Adjustments ReinsuranceRecoverableForUnpaidClaimsAndClaimsAdjustments	869500000	usd
CY2023Q3	us-gaap	Liability For Claims And Claims Adjustment Expense LiabilityForClaimsAndClaimsAdjustmentExpense	2010800000	usd
	us-gaap	Supplemental Information For Property Casualty Insurance Underwriters Prior Year Claims And Claims Adjustment Expense SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense	-30700000	usd
CY2024Q3	us-gaap	Liability For Future Policy Benefits LiabilityForFuturePolicyBenefits	504000000.0	usd
CY2023Q4	us-gaap	Liability For Future Policy Benefits LiabilityForFuturePolicyBenefits	487200000	usd
CY2024Q3	us-gaap	Liability For Future Policy Benefit Expected Future Policy Benefit Undiscounted Before Reinsurance LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitUndiscountedBeforeReinsurance	814200000	usd
CY2023Q4	us-gaap	Liability For Future Policy Benefit Expected Future Policy Benefit Undiscounted Before Reinsurance LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitUndiscountedBeforeReinsurance	829300000	usd
CY2024Q3	us-gaap	Liability For Future Policy Benefit Expected Future Gross Premium Undiscounted Before Reinsurance LiabilityForFuturePolicyBenefitExpectedFutureGrossPremiumUndiscountedBeforeReinsurance	64700000	usd
CY2023Q4	us-gaap	Liability For Future Policy Benefit Expected Future Gross Premium Undiscounted Before Reinsurance LiabilityForFuturePolicyBenefitExpectedFutureGrossPremiumUndiscountedBeforeReinsurance	69400000	usd
	us-gaap	Liability For Future Policy Benefit Gross Premium Income LiabilityForFuturePolicyBenefitGrossPremiumIncome	1500000	usd
	us-gaap	Liability For Future Policy Benefit Gross Premium Income LiabilityForFuturePolicyBenefitGrossPremiumIncome	1600000	usd
	us-gaap	Liability For Future Policy Benefit Interest Expense LiabilityForFuturePolicyBenefitInterestExpense	5700000	usd
	us-gaap	Liability For Future Policy Benefit Interest Expense LiabilityForFuturePolicyBenefitInterestExpense	5600000	usd
CY2024Q3	us-gaap	Liability For Future Policy Benefit Weighted Average Interest Accretion Rate LiabilityForFuturePolicyBenefitWeightedAverageInterestAccretionRate	0.0595
CY2023Q3	us-gaap	Liability For Future Policy Benefit Weighted Average Interest Accretion Rate LiabilityForFuturePolicyBenefitWeightedAverageInterestAccretionRate	0.0595
CY2024Q3	us-gaap	Liability For Future Policy Benefit Current Weighted Average Discount Rate LiabilityForFuturePolicyBenefitCurrentWeightedAverageDiscountRate	0.0545
CY2023Q3	us-gaap	Liability For Future Policy Benefit Current Weighted Average Discount Rate LiabilityForFuturePolicyBenefitCurrentWeightedAverageDiscountRate	0.0545
CY2024Q3	us-gaap	Other Comprehensive Income Loss Before Reclassifications Net Of Tax OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax	212200000	usd
CY2024Q3	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	-13300000	usd
CY2024Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	225500000	usd
CY2023Q3	us-gaap	Other Comprehensive Income Loss Before Reclassifications Net Of Tax OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax	-137200000	usd
CY2023Q3	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	-8900000	usd
CY2023Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-128300000	usd
	us-gaap	Other Comprehensive Income Loss Before Reclassifications Net Of Tax OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax	112300000	usd
	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	-25500000	usd
	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	137800000	usd
	us-gaap	Other Comprehensive Income Loss Before Reclassifications Net Of Tax OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax	-78600000	usd
	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	-13800000	usd
	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-64800000	usd
CY2024Q3	us-gaap	Net Income Loss NetIncomeLoss	133800000	usd
	us-gaap	Net Income Loss NetIncomeLoss	558900000	usd
	us-gaap	Net Income Loss NetIncomeLoss	460000000.0	usd
	us-gaap	Dividends Common Stock DividendsCommonStock	114800000	usd
	us-gaap	Dividends Common Stock DividendsCommonStock	113800000	usd
CY2024Q3	us-gaap	Undistributed Earnings UndistributedEarnings	96300000	usd
CY2024Q3	us-gaap	Undistributed Earnings Diluted UndistributedEarningsDiluted	96300000	usd
CY2023Q3	us-gaap	Undistributed Earnings UndistributedEarnings	153000000.0	usd
	us-gaap	Undistributed Earnings UndistributedEarnings	346200000	usd
	us-gaap	Undistributed Earnings Diluted UndistributedEarningsDiluted	346200000	usd
CY2024Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	52204057	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	52411457	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	53591495	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	52704874	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	53824384	shares
CY2023Q3	us-gaap	Earnings Per Share Basic Distributed EarningsPerShareBasicDistributed	0.69
	us-gaap	Earnings Per Share Basic Distributed EarningsPerShareBasicDistributed	2.19
	us-gaap	Earnings Per Share Basic Distributed EarningsPerShareBasicDistributed	2.12
	us-gaap	Earnings Per Share Basic Undistributed EarningsPerShareBasicUndistributed	8.47
	us-gaap	Earnings Per Share Basic Undistributed EarningsPerShareBasicUndistributed	6.46
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	10.66
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	8.58
	us-gaap	Earnings Per Share Diluted Distributed EarningsPerShareDilutedDistributed	2.17
	us-gaap	Earnings Per Share Diluted Distributed EarningsPerShareDilutedDistributed	2.12
	us-gaap	Earnings Per Share Diluted Undistributed EarningsPerShareDilutedUndistributed	8.43
	us-gaap	Earnings Per Share Diluted Undistributed EarningsPerShareDilutedUndistributed	6.43
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	10.60
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	8.55
CY2024Q3	us-gaap	Defined Benefit Plan Funded Status Of Plan DefinedBenefitPlanFundedStatusOfPlan	86500000	usd
CY2023Q4	us-gaap	Defined Benefit Plan Funded Status Of Plan DefinedBenefitPlanFundedStatusOfPlan	86600000	usd
CY2024Q3	us-gaap	Defined Benefit Plan Funded Percentage DefinedBenefitPlanFundedPercentage	1.16
CY2023Q4	us-gaap	Defined Benefit Plan Funded Percentage DefinedBenefitPlanFundedPercentage	1.16
	us-gaap	Pension Contributions PensionContributions	0	usd
CY2024Q3	us-gaap	Defined Benefit Plan Expected Future Employer Contributions Remainder Of Fiscal Year DefinedBenefitPlanExpectedFutureEmployerContributionsRemainderOfFiscalYear	0	usd
CY2024Q3	us-gaap	Restructuring And Related Cost Incurred Cost RestructuringAndRelatedCostIncurredCost	-1000000.0	usd
	us-gaap	Restructuring And Related Cost Incurred Cost RestructuringAndRelatedCostIncurredCost	200000	usd
	us-gaap	Restructuring And Related Cost Incurred Cost RestructuringAndRelatedCostIncurredCost	18300000	usd
CY2024Q3	us-gaap	Restructuring And Related Cost Expected Cost Remaining1 RestructuringAndRelatedCostExpectedCostRemaining1	3200000	usd
CY2024Q3	us-gaap	Restructuring And Related Cost Expected Cost1 RestructuringAndRelatedCostExpectedCost1	90600000	usd
CY2024Q3	us-gaap	Letters Of Credit Outstanding Amount LettersOfCreditOutstandingAmount	1800000	usd
CY2023Q4	us-gaap	Letters Of Credit Outstanding Amount LettersOfCreditOutstandingAmount	2900000	usd
	us-gaap	Reinsurance Retention Amount Retained Per Event ReinsuranceRetentionAmountRetainedPerEvent	150000000	usd
CY2024Q3	ecd	Non Rule10b51 Arr Adopted Flag NonRule10b51ArrAdoptedFlag	false
CY2024Q3	ecd	Rule10b51 Arr Adopted Flag Rule10b51ArrAdoptedFlag	false
CY2024Q3	ecd	Rule10b51 Arr Trmntd Flag Rule10b51ArrTrmntdFlag	false
CY2024Q3	ecd	Non Rule10b51 Arr Trmntd Flag NonRule10b51ArrTrmntdFlag	false

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0001267238-24-000047-xbrl.zip	Edgar Link	pending
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aiz-20240930_pre.xml	Edgar Link	unprocessable
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report.css	Edgar Link	pending
Show.js	Edgar Link	pending
FilingSummary.xml	Edgar Link	unprocessable

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$AIZ
ASSURANT, INC. Stock $aiz

2024 Q4 Form 10-Q Financial Statement

#000126723824000047 Filed on November 07, 2024

Income Statement

Balance Sheet

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$AIZ ASSURANT, INC. Stock $aiz

2024 Q4 Form 10-Q Financial Statement

#000126723824000047 Filed on November 07, 2024

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$AIZ
ASSURANT, INC. Stock $aiz