3.25.4 html 854 816 1 false 240 0 false 12 false false R1.htm 0000001 - Document - Cover Page Sheet http://www.assurant.com/role/CoverPage Cover Page Cover 1 false false R2.htm 0000002 - Document - Audit Information Sheet http://www.assurant.com/role/AuditInformation Audit Information Cover 2 false false R3.htm 9952151 - Statement - Consolidated Balance Sheets Sheet http://www.assurant.com/role/ConsolidatedBalanceSheets Consolidated Balance Sheets Statements 3 false false R4.htm 9952152 - Statement - Consolidated Balance Sheets (Parenthetical) Sheet http://www.assurant.com/role/ConsolidatedBalanceSheetsParenthetical Consolidated Balance Sheets (Parenthetical) Statements 4 false false R5.htm 9952153 - Statement - Consolidated Statements of Operations Sheet http://www.assurant.com/role/ConsolidatedStatementsofOperations Consolidated Statements of Operations Statements 5 false false R6.htm 9952154 - Statement - Consolidated Statements of Operations (Parenthetical) Sheet http://www.assurant.com/role/ConsolidatedStatementsofOperationsParenthetical Consolidated Statements of Operations (Parenthetical) Statements 6 false false R7.htm 9952155 - Statement - Consolidated Statements of Comprehensive Income Sheet http://www.assurant.com/role/ConsolidatedStatementsofComprehensiveIncome Consolidated Statements of Comprehensive Income Statements 7 false false R8.htm 9952156 - Statement - Consolidated Statements of Comprehensive Income (Parenthetical) Sheet http://www.assurant.com/role/ConsolidatedStatementsofComprehensiveIncomeParenthetical Consolidated Statements of Comprehensive Income (Parenthetical) Statements 8 false false R9.htm 9952157 - Statement - Consolidated Statements of Changes in Stockholders' Equity Sheet http://www.assurant.com/role/ConsolidatedStatementsofChangesinStockholdersEquity Consolidated Statements of Changes in Stockholders' Equity Statements 9 false false R10.htm 9952158 - Statement - Consolidated Statements of Changes in Stockholders' Equity (Parenthetical) Sheet http://www.assurant.com/role/ConsolidatedStatementsofChangesinStockholdersEquityParenthetical Consolidated Statements of Changes in Stockholders' Equity (Parenthetical) Statements 10 false false R11.htm 9952159 - Statement - Consolidated Statements of Cash Flows Sheet http://www.assurant.com/role/ConsolidatedStatementsofCashFlows Consolidated Statements of Cash Flows Statements 11 false false R12.htm 9952160 - Disclosure - Nature of Operations Sheet http://www.assurant.com/role/NatureofOperations Nature of Operations Notes 12 false false R13.htm 9952161 - Disclosure - Summary of Significant Accounting Policies Sheet http://www.assurant.com/role/SummaryofSignificantAccountingPolicies Summary of Significant Accounting Policies Notes 13 false false R14.htm 9952162 - Disclosure - Disposition Sheet http://www.assurant.com/role/Disposition Disposition Notes 14 false false R15.htm 9952163 - Disclosure - Allowance for Credit Losses Sheet http://www.assurant.com/role/AllowanceforCreditLosses Allowance for Credit Losses Notes 15 false false R16.htm 9952164 - Disclosure - Segment Information Sheet http://www.assurant.com/role/SegmentInformation Segment Information Notes 16 false false R17.htm 9952165 - Disclosure - Contract Revenues Sheet http://www.assurant.com/role/ContractRevenues Contract Revenues Notes 17 false false R18.htm 9952166 - Disclosure - Investments Sheet http://www.assurant.com/role/Investments Investments Notes 18 false false R19.htm 9952167 - Disclosure - Variable Interest Entities Sheet http://www.assurant.com/role/VariableInterestEntities Variable Interest Entities Notes 19 false false R20.htm 9952168 - Disclosure - Fair Value Disclosures Sheet http://www.assurant.com/role/FairValueDisclosures Fair Value Disclosures Notes 20 false false R21.htm 9952169 - Disclosure - Premiums and Accounts Receivable Sheet http://www.assurant.com/role/PremiumsandAccountsReceivable Premiums and Accounts Receivable Notes 21 false false R22.htm 9952170 - Disclosure - Income Taxes Sheet http://www.assurant.com/role/IncomeTaxes Income Taxes Notes 22 false false R23.htm 9952171 - Disclosure - Deferred Acquisition Costs Sheet http://www.assurant.com/role/DeferredAcquisitionCosts Deferred Acquisition Costs Notes 23 false false R24.htm 9952172 - Disclosure - Property and Equipment Sheet http://www.assurant.com/role/PropertyandEquipment Property and Equipment Notes 24 false false R25.htm 9952173 - Disclosure - Goodwill Sheet http://www.assurant.com/role/Goodwill Goodwill Notes 25 false false R26.htm 9952174 - Disclosure - VOBA and Other Intangible Assets Sheet http://www.assurant.com/role/VOBAandOtherIntangibleAssets VOBA and Other Intangible Assets Notes 26 false false R27.htm 9952175 - Disclosure - Reserves Sheet http://www.assurant.com/role/Reserves Reserves Notes 27 false false R28.htm 9952176 - Disclosure - Reinsurance Sheet http://www.assurant.com/role/Reinsurance Reinsurance Notes 28 false false R29.htm 9952177 - Disclosure - Debt Sheet http://www.assurant.com/role/Debt Debt Notes 29 false false R30.htm 9952178 - Disclosure - Equity Transactions Sheet http://www.assurant.com/role/EquityTransactions Equity Transactions Notes 30 false false R31.htm 9952179 - Disclosure - Stock Based Compensation Sheet http://www.assurant.com/role/StockBasedCompensation Stock Based Compensation Notes 31 false false R32.htm 9952180 - Disclosure - Accumulated Other Comprehensive Income Sheet http://www.assurant.com/role/AccumulatedOtherComprehensiveIncome Accumulated Other Comprehensive Income Notes 32 false false R33.htm 9952181 - Disclosure - Statutory Information Sheet http://www.assurant.com/role/StatutoryInformation Statutory Information Notes 33 false false R34.htm 9952182 - Disclosure - Retirement and Other Employee Benefits Sheet http://www.assurant.com/role/RetirementandOtherEmployeeBenefits Retirement and Other Employee Benefits Notes 34 false false R35.htm 9952183 - Disclosure - Earnings Per Common Share Sheet http://www.assurant.com/role/EarningsPerCommonShare Earnings Per Common Share Notes 35 false false R36.htm 9952184 - Disclosure - Restructuring and Related Impairment Charges Sheet http://www.assurant.com/role/RestructuringandRelatedImpairmentCharges Restructuring and Related Impairment Charges Notes 36 false false R37.htm 9952185 - Disclosure - Commitments and Contingencies Sheet http://www.assurant.com/role/CommitmentsandContingencies Commitments and Contingencies Notes 37 false false R38.htm 9952186 - Disclosure - Schedule I ??? Summary of Investments - Other Than Investments in Related Parties Sheet http://www.assurant.com/role/ScheduleISummaryofInvestmentsOtherThanInvestmentsinRelatedParties Schedule I ??? Summary of Investments - Other Than Investments in Related Parties Notes 38 false false R39.htm 9952187 - Disclosure - Schedule II ??? Condensed Financial Statements (Parent Only) Sheet http://www.assurant.com/role/ScheduleIICondensedFinancialStatementsParentOnly Schedule II ??? Condensed Financial Statements (Parent Only) Notes 39 false false R40.htm 9952188 - Disclosure - Schedule III - Supplementary Insurance Information Sheet http://www.assurant.com/role/ScheduleIIISupplementaryInsuranceInformation Schedule III - Supplementary Insurance Information Notes 40 false false R41.htm 9952189 - Disclosure - Schedule IV ??? Reinsurance Sheet http://www.assurant.com/role/ScheduleIVReinsurance Schedule IV ??? Reinsurance Notes 41 false false R42.htm 9952190 - Disclosure - Schedule V ??? Valuation and Qualifying Accounts Sheet http://www.assurant.com/role/ScheduleVValuationandQualifyingAccounts Schedule V ??? Valuation and Qualifying Accounts Notes 42 false false R43.htm 995445 - Disclosure - Insider Trading Arrangements Sheet http://xbrl.sec.gov/ecd/role/InsiderTradingArrangements Insider Trading Arrangements Notes 43 false false R44.htm 995447 - Disclosure - Insider Trading Policies and Procedures Sheet http://xbrl.sec.gov/ecd/role/InsiderTradingPoliciesProc Insider Trading Policies and Procedures Notes 44 false false R45.htm 995550 - Disclosure - Cybersecurity Risk Management and Strategy Disclosure Sheet http://xbrl.sec.gov/cyd/role/CybersecurityRiskManagementAndStrategyDisclosure Cybersecurity Risk Management and Strategy Disclosure Notes 45 false false R46.htm 9955511 - Disclosure - Summary of Significant Accounting Policies (Policies) Sheet http://www.assurant.com/role/SummaryofSignificantAccountingPoliciesPolicies Summary of Significant Accounting Policies (Policies) Policies http://www.assurant.com/role/SummaryofSignificantAccountingPolicies 46 false false R47.htm 9955512 - Disclosure - Summary of Significant Accounting Policies (Tables) Sheet http://www.assurant.com/role/SummaryofSignificantAccountingPoliciesTables Summary of Significant Accounting Policies (Tables) Tables http://www.assurant.com/role/SummaryofSignificantAccountingPolicies 47 false false R48.htm 9955513 - Disclosure - Allowance for Credit Losses (Tables) Sheet http://www.assurant.com/role/AllowanceforCreditLossesTables Allowance for Credit Losses (Tables) Tables http://www.assurant.com/role/AllowanceforCreditLosses 48 false false R49.htm 9955514 - Disclosure - Segment Information (Tables) Sheet http://www.assurant.com/role/SegmentInformationTables Segment Information (Tables) Tables http://www.assurant.com/role/SegmentInformation 49 false false R50.htm 9955515 - Disclosure - Investments (Tables) Sheet http://www.assurant.com/role/InvestmentsTables Investments (Tables) Tables http://www.assurant.com/role/Investments 50 false false R51.htm 9955516 - Disclosure - Fair Value Disclosures (Tables) Sheet http://www.assurant.com/role/FairValueDisclosuresTables Fair Value Disclosures (Tables) Tables http://www.assurant.com/role/FairValueDisclosures 51 false false R52.htm 9955517 - Disclosure - Premiums and Accounts Receivable (Tables) Sheet http://www.assurant.com/role/PremiumsandAccountsReceivableTables Premiums and Accounts Receivable (Tables) Tables http://www.assurant.com/role/PremiumsandAccountsReceivable 52 false false R53.htm 9955518 - Disclosure - Income Taxes (Tables) Sheet http://www.assurant.com/role/IncomeTaxesTables Income Taxes (Tables) Tables http://www.assurant.com/role/IncomeTaxes 53 false false R54.htm 9955519 - Disclosure - Deferred Acquisition Costs (Tables) Sheet http://www.assurant.com/role/DeferredAcquisitionCostsTables Deferred Acquisition Costs (Tables) Tables http://www.assurant.com/role/DeferredAcquisitionCosts 54 false false R55.htm 9955520 - Disclosure - Property and Equipment (Tables) Sheet http://www.assurant.com/role/PropertyandEquipmentTables Property and Equipment (Tables) Tables http://www.assurant.com/role/PropertyandEquipment 55 false false R56.htm 9955521 - Disclosure - Goodwill (Tables) Sheet http://www.assurant.com/role/GoodwillTables Goodwill (Tables) Tables http://www.assurant.com/role/Goodwill 56 false false R57.htm 9955522 - Disclosure - VOBA and Other Intangible Assets (Tables) Sheet http://www.assurant.com/role/VOBAandOtherIntangibleAssetsTables VOBA and Other Intangible Assets (Tables) Tables http://www.assurant.com/role/VOBAandOtherIntangibleAssets 57 false false R58.htm 9955523 - Disclosure - Reserves (Tables) Sheet http://www.assurant.com/role/ReservesTables Reserves (Tables) Tables http://www.assurant.com/role/Reserves 58 false false R59.htm 9955524 - Disclosure - Reinsurance (Tables) Sheet http://www.assurant.com/role/ReinsuranceTables Reinsurance (Tables) Tables http://www.assurant.com/role/Reinsurance 59 false false R60.htm 9955525 - Disclosure - Debt (Tables) Sheet http://www.assurant.com/role/DebtTables Debt (Tables) Tables http://www.assurant.com/role/Debt 60 false false R61.htm 9955526 - Disclosure - Equity Transactions (Tables) Sheet http://www.assurant.com/role/EquityTransactionsTables Equity Transactions (Tables) Tables http://www.assurant.com/role/EquityTransactions 61 false false R62.htm 9955527 - Disclosure - Stock Based Compensation (Tables) Sheet http://www.assurant.com/role/StockBasedCompensationTables Stock Based Compensation (Tables) Tables http://www.assurant.com/role/StockBasedCompensation 62 false false R63.htm 9955528 - Disclosure - Accumulated Other Comprehensive Income (Tables) Sheet http://www.assurant.com/role/AccumulatedOtherComprehensiveIncomeTables Accumulated Other Comprehensive Income (Tables) Tables http://www.assurant.com/role/AccumulatedOtherComprehensiveIncome 63 false false R64.htm 9955529 - Disclosure - Statutory Information (Tables) Sheet http://www.assurant.com/role/StatutoryInformationTables Statutory Information (Tables) Tables http://www.assurant.com/role/StatutoryInformation 64 false false R65.htm 9955530 - Disclosure - Retirement and Other Employee Benefits (Tables) Sheet http://www.assurant.com/role/RetirementandOtherEmployeeBenefitsTables Retirement and Other Employee Benefits (Tables) Tables http://www.assurant.com/role/RetirementandOtherEmployeeBenefits 65 false false R66.htm 9955531 - Disclosure - Earnings Per Common Share (Tables) Sheet http://www.assurant.com/role/EarningsPerCommonShareTables Earnings Per Common Share (Tables) Tables http://www.assurant.com/role/EarningsPerCommonShare 66 false false R67.htm 9955532 - Disclosure - Restructuring and Related Impairment Charges (Tables) Sheet http://www.assurant.com/role/RestructuringandRelatedImpairmentChargesTables Restructuring and Related Impairment Charges (Tables) Tables http://www.assurant.com/role/RestructuringandRelatedImpairmentCharges 67 false false R68.htm 9955533 - Disclosure - Commitments and Contingencies (Tables) Sheet http://www.assurant.com/role/CommitmentsandContingenciesTables Commitments and Contingencies (Tables) Tables http://www.assurant.com/role/CommitmentsandContingencies 68 false false R69.htm 9955534 - Disclosure - Nature of Operations (Details) Sheet http://www.assurant.com/role/NatureofOperationsDetails Nature of Operations (Details) Details http://www.assurant.com/role/NatureofOperations 69 false false R70.htm 9955535 - Disclosure - Summary of Significant Accounting Policies (Narrative) (Details) Sheet http://www.assurant.com/role/SummaryofSignificantAccountingPoliciesNarrativeDetails Summary of Significant Accounting Policies (Narrative) (Details) Details http://www.assurant.com/role/SummaryofSignificantAccountingPoliciesTables 70 false false R71.htm 9955536 - Disclosure - Summary of Significant Accounting Policies (Reserve Information by Segment) (Details) Sheet http://www.assurant.com/role/SummaryofSignificantAccountingPoliciesReserveInformationbySegmentDetails Summary of Significant Accounting Policies (Reserve Information by Segment) (Details) Details http://www.assurant.com/role/SummaryofSignificantAccountingPoliciesTables 71 false false R72.htm 9955537 - Disclosure - Disposition (Details) Sheet http://www.assurant.com/role/DispositionDetails Disposition (Details) Details http://www.assurant.com/role/Disposition 72 false false R73.htm 9955538 - Disclosure - Allowance for Credit Losses (Narrative) (Details) Sheet http://www.assurant.com/role/AllowanceforCreditLossesNarrativeDetails Allowance for Credit Losses (Narrative) (Details) Details http://www.assurant.com/role/AllowanceforCreditLossesTables 73 false false R74.htm 9955539 - Disclosure - Allowance for Credit Losses (Allowance for Credit Losses, Period Increase (Decrease)) (Details) Sheet http://www.assurant.com/role/AllowanceforCreditLossesAllowanceforCreditLossesPeriodIncreaseDecreaseDetails Allowance for Credit Losses (Allowance for Credit Losses, Period Increase (Decrease)) (Details) Details http://www.assurant.com/role/AllowanceforCreditLossesTables 74 false false R75.htm 9955540 - Disclosure - Allowance for Credit Losses (Changes in Reinsurance Receivables Allowance for Credit Losses) (Details) Sheet http://www.assurant.com/role/AllowanceforCreditLossesChangesinReinsuranceReceivablesAllowanceforCreditLossesDetails Allowance for Credit Losses (Changes in Reinsurance Receivables Allowance for Credit Losses) (Details) Details http://www.assurant.com/role/AllowanceforCreditLossesTables 75 false false R76.htm 9955541 - Disclosure - Allowance for Credit Losses (Changes in Premium and Account Receivables Allowance for Credit Losses) (Details) Sheet http://www.assurant.com/role/AllowanceforCreditLossesChangesinPremiumandAccountReceivablesAllowanceforCreditLossesDetails Allowance for Credit Losses (Changes in Premium and Account Receivables Allowance for Credit Losses) (Details) Details http://www.assurant.com/role/AllowanceforCreditLossesTables 76 false false R77.htm 9955542 - Disclosure - Segment Information (Narrative) (Details) Sheet http://www.assurant.com/role/SegmentInformationNarrativeDetails Segment Information (Narrative) (Details) Details http://www.assurant.com/role/SegmentInformationTables 77 false false R78.htm 9955543 - Disclosure - Segment Information (Segment Adjusted EBITDA) (Details) Sheet http://www.assurant.com/role/SegmentInformationSegmentAdjustedEBITDADetails Segment Information (Segment Adjusted EBITDA) (Details) Details http://www.assurant.com/role/SegmentInformationTables 78 false false R79.htm 9955544 - Disclosure - Segment Information (Segment Adjusted EBITDA Disclosure) (Details) Sheet http://www.assurant.com/role/SegmentInformationSegmentAdjustedEBITDADisclosureDetails Segment Information (Segment Adjusted EBITDA Disclosure) (Details) Details http://www.assurant.com/role/SegmentInformationTables 79 false false R80.htm 9955545 - Disclosure - Segment Information (Financial Information by Geographic Location) (Details) Sheet http://www.assurant.com/role/SegmentInformationFinancialInformationbyGeographicLocationDetails Segment Information (Financial Information by Geographic Location) (Details) Details http://www.assurant.com/role/SegmentInformationTables 80 false false R81.htm 9955546 - Disclosure - Segment Information (Asset by Segment) (Details) Sheet http://www.assurant.com/role/SegmentInformationAssetbySegmentDetails Segment Information (Asset by Segment) (Details) Details http://www.assurant.com/role/SegmentInformationTables 81 false false R82.htm 9955547 - Disclosure - Contract Revenues (Details) Sheet http://www.assurant.com/role/ContractRevenuesDetails Contract Revenues (Details) Details http://www.assurant.com/role/ContractRevenues 82 false false R83.htm 9955548 - Disclosure - Investments (Amortized Cost, Allowance for Credit Losses, Gross Unrealized Gains and Losses, and Fair Value) (Details) Sheet http://www.assurant.com/role/InvestmentsAmortizedCostAllowanceforCreditLossesGrossUnrealizedGainsandLossesandFairValueDetails Investments (Amortized Cost, Allowance for Credit Losses, Gross Unrealized Gains and Losses, and Fair Value) (Details) Details http://www.assurant.com/role/InvestmentsTables 83 false false R84.htm 9955549 - Disclosure - Investments (Amortized Cost and Fair Value of Fixed Maturity Securities by Contractual Maturity) (Details) Sheet http://www.assurant.com/role/InvestmentsAmortizedCostandFairValueofFixedMaturitySecuritiesbyContractualMaturityDetails Investments (Amortized Cost and Fair Value of Fixed Maturity Securities by Contractual Maturity) (Details) Details http://www.assurant.com/role/InvestmentsTables 84 false false R85.htm 9955550 - Disclosure - Investments (Net Investment Income) (Details) Sheet http://www.assurant.com/role/InvestmentsNetInvestmentIncomeDetails Investments (Net Investment Income) (Details) Details http://www.assurant.com/role/InvestmentsTables 85 false false R86.htm 9955551 - Disclosure - Investments (Narrative) (Details) Sheet http://www.assurant.com/role/InvestmentsNarrativeDetails Investments (Narrative) (Details) Details http://www.assurant.com/role/InvestmentsTables 86 false false R87.htm 9955552 - Disclosure - Investments (Sales of Available-For-Sale Securities and the Gross Realized Gains and Gross Realized Losses) (Details) Sheet http://www.assurant.com/role/InvestmentsSalesofAvailableForSaleSecuritiesandtheGrossRealizedGainsandGrossRealizedLossesDetails Investments (Sales of Available-For-Sale Securities and the Gross Realized Gains and Gross Realized Losses) (Details) Details http://www.assurant.com/role/InvestmentsTables 87 false false R88.htm 9955553 - Disclosure - Investments (Net Realized Gains (Losses) on Investments and Fair Value Change to Equity Securities) (Details) Sheet http://www.assurant.com/role/InvestmentsNetRealizedGainsLossesonInvestmentsandFairValueChangetoEquitySecuritiesDetails Investments (Net Realized Gains (Losses) on Investments and Fair Value Change to Equity Securities) (Details) Details http://www.assurant.com/role/InvestmentsTables 88 false false R89.htm 9955554 - Disclosure - Investments (Fair Value Changes to Equity Securities) (Details) Sheet http://www.assurant.com/role/InvestmentsFairValueChangestoEquitySecuritiesDetails Investments (Fair Value Changes to Equity Securities) (Details) Details http://www.assurant.com/role/InvestmentsTables 89 false false R90.htm 9955555 - Disclosure - Investments (Equity Securities without Readily Determinable Fair Value) (Details) Sheet http://www.assurant.com/role/InvestmentsEquitySecuritieswithoutReadilyDeterminableFairValueDetails Investments (Equity Securities without Readily Determinable Fair Value) (Details) Details http://www.assurant.com/role/InvestmentsTables 90 false false R91.htm 9955556 - Disclosure - Investments (Category and Duration of Gross Unrealized Losses on Fixed Maturity Securities and Equity Securities) (Details) Sheet http://www.assurant.com/role/InvestmentsCategoryandDurationofGrossUnrealizedLossesonFixedMaturitySecuritiesandEquitySecuritiesDetails Investments (Category and Duration of Gross Unrealized Losses on Fixed Maturity Securities and Equity Securities) (Details) Details http://www.assurant.com/role/InvestmentsTables 91 false false R92.htm 9955557 - Disclosure - Investments (Amortized Cost and Fair Value of Fixed Maturity Securities in an Unrealized Loss Position by Contractual Maturity) (Details) Sheet http://www.assurant.com/role/InvestmentsAmortizedCostandFairValueofFixedMaturitySecuritiesinanUnrealizedLossPositionbyContractualMaturityDetails Investments (Amortized Cost and Fair Value of Fixed Maturity Securities in an Unrealized Loss Position by Contractual Maturity) (Details) Details http://www.assurant.com/role/InvestmentsTables 92 false false R93.htm 9955558 - Disclosure - Investments (Credit Quality Indicators) (Details) Sheet http://www.assurant.com/role/InvestmentsCreditQualityIndicatorsDetails Investments (Credit Quality Indicators) (Details) Details http://www.assurant.com/role/InvestmentsTables 93 false false R94.htm 9955559 - Disclosure - Variable Interest Entities (Details) Sheet http://www.assurant.com/role/VariableInterestEntitiesDetails Variable Interest Entities (Details) Details http://www.assurant.com/role/VariableInterestEntities 94 false false R95.htm 9955560 - Disclosure - Fair Value Disclosures (Fair Value for Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Details) Sheet http://www.assurant.com/role/FairValueDisclosuresFairValueforAssetsandLiabilitiesMeasuredatFairValueonaRecurringBasisDetails Fair Value Disclosures (Fair Value for Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Details) Details http://www.assurant.com/role/FairValueDisclosuresTables 95 false false R96.htm 9955561 - Disclosure - Fair Value Disclosures (Change in Balance Sheet Carrying Value Associated With Level 3 Financial Assets Carried at Fair Value) (Details) Sheet http://www.assurant.com/role/FairValueDisclosuresChangeinBalanceSheetCarryingValueAssociatedWithLevel3FinancialAssetsCarriedatFairValueDetails Fair Value Disclosures (Change in Balance Sheet Carrying Value Associated With Level 3 Financial Assets Carried at Fair Value) (Details) Details http://www.assurant.com/role/FairValueDisclosuresTables 96 false false R97.htm 9955562 - Disclosure - Fair Value Disclosures (Narrative) (Details) Sheet http://www.assurant.com/role/FairValueDisclosuresNarrativeDetails Fair Value Disclosures (Narrative) (Details) Details http://www.assurant.com/role/FairValueDisclosuresTables 97 false false R98.htm 9955563 - Disclosure - Fair Value Disclosures (Carrying Value and Fair Value of the Financial Instruments That are Not Recognized or are Not Carried at Fair Value) (Details) Sheet http://www.assurant.com/role/FairValueDisclosuresCarryingValueandFairValueoftheFinancialInstrumentsThatareNotRecognizedorareNotCarriedatFairValueDetails Fair Value Disclosures (Carrying Value and Fair Value of the Financial Instruments That are Not Recognized or are Not Carried at Fair Value) (Details) Details http://www.assurant.com/role/FairValueDisclosuresTables 98 false false R99.htm 9955564 - Disclosure - Premiums and Accounts Receivable (Allowance for Uncollectible Amounts) (Details) Sheet http://www.assurant.com/role/PremiumsandAccountsReceivableAllowanceforUncollectibleAmountsDetails Premiums and Accounts Receivable (Allowance for Uncollectible Amounts) (Details) Details http://www.assurant.com/role/PremiumsandAccountsReceivableTables 99 false false R100.htm 9955565 - Disclosure - Income Taxes (Information About Domestic and Foreign Pre-Tax Income) (Details) Sheet http://www.assurant.com/role/IncomeTaxesInformationAboutDomesticandForeignPreTaxIncomeDetails Income Taxes (Information About Domestic and Foreign Pre-Tax Income) (Details) Details http://www.assurant.com/role/IncomeTaxesTables 100 false false R101.htm 9955566 - Disclosure - Income Taxes (Components of Income Tax Expense (Benefit) (Details) Sheet http://www.assurant.com/role/IncomeTaxesComponentsofIncomeTaxExpenseBenefitDetails Income Taxes (Components of Income Tax Expense (Benefit) (Details) Details http://www.assurant.com/role/IncomeTaxesTables 101 false false R102.htm 9955567 - Disclosure - Income Taxes (Reconciliation of Federal Income Tax Rate Reflecting the Adoption of ASU 2023-09) (Details) Sheet http://www.assurant.com/role/IncomeTaxesReconciliationofFederalIncomeTaxRateReflectingtheAdoptionofASU202309Details Income Taxes (Reconciliation of Federal Income Tax Rate Reflecting the Adoption of ASU 2023-09) (Details) Details http://www.assurant.com/role/IncomeTaxesTables 102 false false R103.htm 9955568 - Disclosure - Income Taxes (Reconciliation of Effective Income Tax Rate prior to the Adoption of ASU 2023-09) (Details) Sheet http://www.assurant.com/role/IncomeTaxesReconciliationofEffectiveIncomeTaxRatepriortotheAdoptionofASU202309Details Income Taxes (Reconciliation of Effective Income Tax Rate prior to the Adoption of ASU 2023-09) (Details) Details http://www.assurant.com/role/IncomeTaxesTables 103 false false R104.htm 9955569 - Disclosure - Income Taxes (Income Tax Paid) (Details) Sheet http://www.assurant.com/role/IncomeTaxesIncomeTaxPaidDetails Income Taxes (Income Tax Paid) (Details) Details http://www.assurant.com/role/IncomeTaxesTables 104 false false R105.htm 9955570 - Disclosure - Income Taxes (Unrecognized Tax Benefits) (Details) Sheet http://www.assurant.com/role/IncomeTaxesUnrecognizedTaxBenefitsDetails Income Taxes (Unrecognized Tax Benefits) (Details) Details http://www.assurant.com/role/IncomeTaxesTables 105 false false R106.htm 9955571 - Disclosure - Income Taxes (Narrative) (Details) Sheet http://www.assurant.com/role/IncomeTaxesNarrativeDetails Income Taxes (Narrative) (Details) Details http://www.assurant.com/role/IncomeTaxesTables 106 false false R107.htm 9955572 - Disclosure - Income Taxes (Deferred Tax Assets and Deferred Tax Liabilities) (Details) Sheet http://www.assurant.com/role/IncomeTaxesDeferredTaxAssetsandDeferredTaxLiabilitiesDetails Income Taxes (Deferred Tax Assets and Deferred Tax Liabilities) (Details) Details http://www.assurant.com/role/IncomeTaxesTables 107 false false R108.htm 9955573 - Disclosure - Income Taxes (Net Operating Loss Carryforwards) (Details) Sheet http://www.assurant.com/role/IncomeTaxesNetOperatingLossCarryforwardsDetails Income Taxes (Net Operating Loss Carryforwards) (Details) Details http://www.assurant.com/role/IncomeTaxesTables 108 false false R109.htm 9955574 - Disclosure - Deferred Acquisition Costs (Deferred Acquisition Costs) (Details) Sheet http://www.assurant.com/role/DeferredAcquisitionCostsDeferredAcquisitionCostsDetails Deferred Acquisition Costs (Deferred Acquisition Costs) (Details) Details http://www.assurant.com/role/DeferredAcquisitionCostsTables 109 false false R110.htm 9955575 - Disclosure - Property and Equipment (Components of Property and Equipment) (Details) Sheet http://www.assurant.com/role/PropertyandEquipmentComponentsofPropertyandEquipmentDetails Property and Equipment (Components of Property and Equipment) (Details) Details http://www.assurant.com/role/PropertyandEquipmentTables 110 false false R111.htm 9955576 - Disclosure - Property and Equipment (Narrative) (Details) Sheet http://www.assurant.com/role/PropertyandEquipmentNarrativeDetails Property and Equipment (Narrative) (Details) Details http://www.assurant.com/role/PropertyandEquipmentTables 111 false false R112.htm 9955577 - Disclosure - Goodwill (Narrative) (Details) Sheet http://www.assurant.com/role/GoodwillNarrativeDetails Goodwill (Narrative) (Details) Details http://www.assurant.com/role/GoodwillTables 112 false false R113.htm 9955578 - Disclosure - Goodwill (Goodwill by Reportable Segments) (Details) Sheet http://www.assurant.com/role/GoodwillGoodwillbyReportableSegmentsDetails Goodwill (Goodwill by Reportable Segments) (Details) Details http://www.assurant.com/role/GoodwillTables 113 false false R114.htm 9955579 - Disclosure - VOBA and Other Intangible Assets (Information About VOBA) (Details) Sheet http://www.assurant.com/role/VOBAandOtherIntangibleAssetsInformationAboutVOBADetails VOBA and Other Intangible Assets (Information About VOBA) (Details) Details http://www.assurant.com/role/VOBAandOtherIntangibleAssetsTables 114 false false R115.htm 9955580 - Disclosure - VOBA and Other Intangible Assets (Estimated Amortization of VOBA) (Details) Sheet http://www.assurant.com/role/VOBAandOtherIntangibleAssetsEstimatedAmortizationofVOBADetails VOBA and Other Intangible Assets (Estimated Amortization of VOBA) (Details) Details http://www.assurant.com/role/VOBAandOtherIntangibleAssetsTables 115 false false R116.htm 9955581 - Disclosure - VOBA and Other Intangible Assets (Other Intangible Assets) (Details) Sheet http://www.assurant.com/role/VOBAandOtherIntangibleAssetsOtherIntangibleAssetsDetails VOBA and Other Intangible Assets (Other Intangible Assets) (Details) Details http://www.assurant.com/role/VOBAandOtherIntangibleAssetsTables 116 false false R117.htm 9955582 - Disclosure - VOBA and Other Intangible Assets (Intangible Assets Amortization Expense) (Details) Sheet http://www.assurant.com/role/VOBAandOtherIntangibleAssetsIntangibleAssetsAmortizationExpenseDetails VOBA and Other Intangible Assets (Intangible Assets Amortization Expense) (Details) Details http://www.assurant.com/role/VOBAandOtherIntangibleAssetsTables 117 false false R118.htm 9955583 - Disclosure - VOBA and Other Intangible Assets (Future Amortization Expenses) (Details) Sheet http://www.assurant.com/role/VOBAandOtherIntangibleAssetsFutureAmortizationExpensesDetails VOBA and Other Intangible Assets (Future Amortization Expenses) (Details) Details http://www.assurant.com/role/VOBAandOtherIntangibleAssetsTables 118 false false R119.htm 9955584 - Disclosure - Reserves (Balances of and Changes in Liability for Future Policy Benefits) (Details) Sheet http://www.assurant.com/role/ReservesBalancesofandChangesinLiabilityforFuturePolicyBenefitsDetails Reserves (Balances of and Changes in Liability for Future Policy Benefits) (Details) Details http://www.assurant.com/role/ReservesTables 119 false false R120.htm 9955585 - Disclosure - Reserves (Policyholder Account Balances, Future Policy Benefits and Claims) (Details) Sheet http://www.assurant.com/role/ReservesPolicyholderAccountBalancesFuturePolicyBenefitsandClaimsDetails Reserves (Policyholder Account Balances, Future Policy Benefits and Claims) (Details) Details http://www.assurant.com/role/ReservesTables 120 false false R121.htm 9955586 - Disclosure - Reserves (Undiscounted Expected Future Benefit Payments and Expected Gross Premiums) (Details) Sheet http://www.assurant.com/role/ReservesUndiscountedExpectedFutureBenefitPaymentsandExpectedGrossPremiumsDetails Reserves (Undiscounted Expected Future Benefit Payments and Expected Gross Premiums) (Details) Details http://www.assurant.com/role/ReservesTables 121 false false R122.htm 9955587 - Disclosure - Reserves (Gross Premium and Interest Expense) (Details) Sheet http://www.assurant.com/role/ReservesGrossPremiumandInterestExpenseDetails Reserves (Gross Premium and Interest Expense) (Details) Details http://www.assurant.com/role/ReservesTables 122 false false R123.htm 9955588 - Disclosure - Reserves (Discount Rate) (Details) Sheet http://www.assurant.com/role/ReservesDiscountRateDetails Reserves (Discount Rate) (Details) Details http://www.assurant.com/role/ReservesTables 123 false false R124.htm 9955589 - Disclosure - Reserves (Narrative) (Details) Sheet http://www.assurant.com/role/ReservesNarrativeDetails Reserves (Narrative) (Details) Details http://www.assurant.com/role/ReservesTables 124 false false R125.htm 9955590 - Disclosure - Reserves (Roll Forward of Claims and Benefits Payable) (Details) Sheet http://www.assurant.com/role/ReservesRollForwardofClaimsandBenefitsPayableDetails Reserves (Roll Forward of Claims and Benefits Payable) (Details) Details http://www.assurant.com/role/ReservesTables 125 false false R126.htm 9955591 - Disclosure - Reserves (Prior Year Incurred Losses by Year) (Details) Sheet http://www.assurant.com/role/ReservesPriorYearIncurredLossesbyYearDetails Reserves (Prior Year Incurred Losses by Year) (Details) Details http://www.assurant.com/role/ReservesTables 126 false false R127.htm 9955592 - Disclosure - Reserves (Claims Development) (Details) Sheet http://www.assurant.com/role/ReservesClaimsDevelopmentDetails Reserves (Claims Development) (Details) Details http://www.assurant.com/role/ReservesTables 127 false false R128.htm 9955593 - Disclosure - Reserves (Average Annual Payout of Incurred Claims by Age, Net of Reinsurance) (Details) Sheet http://www.assurant.com/role/ReservesAverageAnnualPayoutofIncurredClaimsbyAgeNetofReinsuranceDetails Reserves (Average Annual Payout of Incurred Claims by Age, Net of Reinsurance) (Details) Details http://www.assurant.com/role/ReservesTables 128 false false R129.htm 9955594 - Disclosure - Reserves (Reconciliation of Net Incurred and Paid Claims Development to Liability for Claims and Benefits Payable) (Details) Sheet http://www.assurant.com/role/ReservesReconciliationofNetIncurredandPaidClaimsDevelopmenttoLiabilityforClaimsandBenefitsPayableDetails Reserves (Reconciliation of Net Incurred and Paid Claims Development to Liability for Claims and Benefits Payable) (Details) Details http://www.assurant.com/role/ReservesTables 129 false false R130.htm 9955595 - Disclosure - Reinsurance (Reinsurance Recoverable) (Details) Sheet http://www.assurant.com/role/ReinsuranceReinsuranceRecoverableDetails Reinsurance (Reinsurance Recoverable) (Details) Details http://www.assurant.com/role/ReinsuranceTables 130 false false R131.htm 9955596 - Disclosure - Reinsurance (Rating for Existing Reinsurance) (Details) Sheet http://www.assurant.com/role/ReinsuranceRatingforExistingReinsuranceDetails Reinsurance (Rating for Existing Reinsurance) (Details) Details http://www.assurant.com/role/ReinsuranceTables 131 false false R132.htm 9955597 - Disclosure - Reinsurance (Effect of Reinsurance on Premiums Earned and Benefits Incurred) (Details) Sheet http://www.assurant.com/role/ReinsuranceEffectofReinsuranceonPremiumsEarnedandBenefitsIncurredDetails Reinsurance (Effect of Reinsurance on Premiums Earned and Benefits Incurred) (Details) Details http://www.assurant.com/role/ReinsuranceTables 132 false false R133.htm 9955598 - Disclosure - Reinsurance (Narrative) (Details) Sheet http://www.assurant.com/role/ReinsuranceNarrativeDetails Reinsurance (Narrative) (Details) Details http://www.assurant.com/role/ReinsuranceTables 133 false false R134.htm 9955599 - Disclosure - Debt (Principal Amount and Carrying Value of Outstanding Debt) (Details) Sheet http://www.assurant.com/role/DebtPrincipalAmountandCarryingValueofOutstandingDebtDetails Debt (Principal Amount and Carrying Value of Outstanding Debt) (Details) Details http://www.assurant.com/role/DebtTables 134 false false R135.htm 9955600 - Disclosure - Debt (Senior Notes and Subordinated Notes) (Details) Notes http://www.assurant.com/role/DebtSeniorNotesandSubordinatedNotesDetails Debt (Senior Notes and Subordinated Notes) (Details) Details http://www.assurant.com/role/DebtTables 135 false false R136.htm 9955601 - Disclosure - Debt (Credit Facility and Commercial Paper Program) (Details) Sheet http://www.assurant.com/role/DebtCreditFacilityandCommercialPaperProgramDetails Debt (Credit Facility and Commercial Paper Program) (Details) Details http://www.assurant.com/role/DebtTables 136 false false R137.htm 9955602 - Disclosure - Debt (Covenants) (Details) Sheet http://www.assurant.com/role/DebtCovenantsDetails Debt (Covenants) (Details) Details http://www.assurant.com/role/DebtTables 137 false false R138.htm 9955603 - Disclosure - Debt (Interest Rate Derivatives) (Details) Sheet http://www.assurant.com/role/DebtInterestRateDerivativesDetails Debt (Interest Rate Derivatives) (Details) Details http://www.assurant.com/role/DebtTables 138 false false R139.htm 9955604 - Disclosure - Equity Transactions (Common Stock) (Details) Sheet http://www.assurant.com/role/EquityTransactionsCommonStockDetails Equity Transactions (Common Stock) (Details) Details http://www.assurant.com/role/EquityTransactionsTables 139 false false R140.htm 9955605 - Disclosure - Equity Transactions (Preferred Stock) (Details) Sheet http://www.assurant.com/role/EquityTransactionsPreferredStockDetails Equity Transactions (Preferred Stock) (Details) Details http://www.assurant.com/role/EquityTransactionsTables 140 false false R141.htm 9955606 - Disclosure - Equity Transactions (Stock Repurchase) (Details) Sheet http://www.assurant.com/role/EquityTransactionsStockRepurchaseDetails Equity Transactions (Stock Repurchase) (Details) Details http://www.assurant.com/role/EquityTransactionsTables 141 false false R142.htm 9955607 - Disclosure - Stock Based Compensation (Narrative) (Details) Sheet http://www.assurant.com/role/StockBasedCompensationNarrativeDetails Stock Based Compensation (Narrative) (Details) Details http://www.assurant.com/role/StockBasedCompensationTables 142 false false R143.htm 9955608 - Disclosure - Stock Based Compensation (Outstanding Restricted Stock Units) (Details) Sheet http://www.assurant.com/role/StockBasedCompensationOutstandingRestrictedStockUnitsDetails Stock Based Compensation (Outstanding Restricted Stock Units) (Details) Details http://www.assurant.com/role/StockBasedCompensationTables 143 false false R144.htm 9955609 - Disclosure - Stock Based Compensation (RSU Activity) (Details) Sheet http://www.assurant.com/role/StockBasedCompensationRSUActivityDetails Stock Based Compensation (RSU Activity) (Details) Details http://www.assurant.com/role/StockBasedCompensationTables 144 false false R145.htm 9955610 - Disclosure - Stock Based Compensation (Outstanding Performance Share Units) (Details) Sheet http://www.assurant.com/role/StockBasedCompensationOutstandingPerformanceShareUnitsDetails Stock Based Compensation (Outstanding Performance Share Units) (Details) Details http://www.assurant.com/role/StockBasedCompensationTables 145 false false R146.htm 9955611 - Disclosure - Stock Based Compensation (Fair Value of Awards) (Details) Sheet http://www.assurant.com/role/StockBasedCompensationFairValueofAwardsDetails Stock Based Compensation (Fair Value of Awards) (Details) Details http://www.assurant.com/role/StockBasedCompensationTables 146 false false R147.htm 9955612 - Disclosure - Stock Based Compensation (PSU Activity) (Details) Sheet http://www.assurant.com/role/StockBasedCompensationPSUActivityDetails Stock Based Compensation (PSU Activity) (Details) Details http://www.assurant.com/role/StockBasedCompensationTables 147 false false R148.htm 9955613 - Disclosure - Stock Based Compensation (Share-Based Payment Award, ESPP, Valuation Assumptions) (Details) Sheet http://www.assurant.com/role/StockBasedCompensationShareBasedPaymentAwardESPPValuationAssumptionsDetails Stock Based Compensation (Share-Based Payment Award, ESPP, Valuation Assumptions) (Details) Details http://www.assurant.com/role/StockBasedCompensationTables 148 false false R149.htm 9955614 - Disclosure - Accumulated Other Comprehensive Income (Components of Accumulated Other Comprehensive Income, Net of Tax) (Details) Sheet http://www.assurant.com/role/AccumulatedOtherComprehensiveIncomeComponentsofAccumulatedOtherComprehensiveIncomeNetofTaxDetails Accumulated Other Comprehensive Income (Components of Accumulated Other Comprehensive Income, Net of Tax) (Details) Details http://www.assurant.com/role/AccumulatedOtherComprehensiveIncomeTables 149 false false R150.htm 9955615 - Disclosure - Accumulated Other Comprehensive Income (Reclassification out of Accumulated Other Comprehensive Income) (Details) Sheet http://www.assurant.com/role/AccumulatedOtherComprehensiveIncomeReclassificationoutofAccumulatedOtherComprehensiveIncomeDetails Accumulated Other Comprehensive Income (Reclassification out of Accumulated Other Comprehensive Income) (Details) Details http://www.assurant.com/role/AccumulatedOtherComprehensiveIncomeTables 150 false false R151.htm 9955616 - Disclosure - Statutory Information (Statutory Net Income and Capital and Surplus) (Details) Sheet http://www.assurant.com/role/StatutoryInformationStatutoryNetIncomeandCapitalandSurplusDetails Statutory Information (Statutory Net Income and Capital and Surplus) (Details) Details http://www.assurant.com/role/StatutoryInformationTables 151 false false R152.htm 9955617 - Disclosure - Statutory Information (Narrative) (Details) Sheet http://www.assurant.com/role/StatutoryInformationNarrativeDetails Statutory Information (Narrative) (Details) Details http://www.assurant.com/role/StatutoryInformationTables 152 false false R153.htm 9955618 - Disclosure - Retirement and Other Employee Benefits (Narrative) (Details) Sheet http://www.assurant.com/role/RetirementandOtherEmployeeBenefitsNarrativeDetails Retirement and Other Employee Benefits (Narrative) (Details) Details http://www.assurant.com/role/RetirementandOtherEmployeeBenefitsTables 153 false false R154.htm 9955619 - Disclosure - Retirement and Other Employee Benefits (Pension Benefits and Retirement Health Benefits Plans) (Details) Sheet http://www.assurant.com/role/RetirementandOtherEmployeeBenefitsPensionBenefitsandRetirementHealthBenefitsPlansDetails Retirement and Other Employee Benefits (Pension Benefits and Retirement Health Benefits Plans) (Details) Details http://www.assurant.com/role/RetirementandOtherEmployeeBenefitsTables 154 false false R155.htm 9955620 - Disclosure - Retirement and Other Employee Benefits (Projected Benefit Obligations and the Accumulated Benefit Obligations) (Details) Sheet http://www.assurant.com/role/RetirementandOtherEmployeeBenefitsProjectedBenefitObligationsandtheAccumulatedBenefitObligationsDetails Retirement and Other Employee Benefits (Projected Benefit Obligations and the Accumulated Benefit Obligations) (Details) Details http://www.assurant.com/role/RetirementandOtherEmployeeBenefitsTables 155 false false R156.htm 9955621 - Disclosure - Retirement and Other Employee Benefits (Recognized in Consolidated Balance Sheets) (Details) Sheet http://www.assurant.com/role/RetirementandOtherEmployeeBenefitsRecognizedinConsolidatedBalanceSheetsDetails Retirement and Other Employee Benefits (Recognized in Consolidated Balance Sheets) (Details) Details http://www.assurant.com/role/RetirementandOtherEmployeeBenefitsTables 156 false false R157.htm 9955622 - Disclosure - Retirement and Other Employee Benefits (Recognized in Accumulated Other Comprehensive Income) (Details) Sheet http://www.assurant.com/role/RetirementandOtherEmployeeBenefitsRecognizedinAccumulatedOtherComprehensiveIncomeDetails Retirement and Other Employee Benefits (Recognized in Accumulated Other Comprehensive Income) (Details) Details http://www.assurant.com/role/RetirementandOtherEmployeeBenefitsTables 157 false false R158.htm 9955623 - Disclosure - Retirement and Other Employee Benefits (Components of Net Periodic Benefit Cost) (Details) Sheet http://www.assurant.com/role/RetirementandOtherEmployeeBenefitsComponentsofNetPeriodicBenefitCostDetails Retirement and Other Employee Benefits (Components of Net Periodic Benefit Cost) (Details) Details http://www.assurant.com/role/RetirementandOtherEmployeeBenefitsTables 158 false false R159.htm 9955624 - Disclosure - Retirement and Other Employee Benefits (Weighted Average Assumptions Used to Determine Projected Benefit Obligation) (Details) Sheet http://www.assurant.com/role/RetirementandOtherEmployeeBenefitsWeightedAverageAssumptionsUsedtoDetermineProjectedBenefitObligationDetails Retirement and Other Employee Benefits (Weighted Average Assumptions Used to Determine Projected Benefit Obligation) (Details) Details http://www.assurant.com/role/RetirementandOtherEmployeeBenefitsTables 159 false false R160.htm 9955625 - Disclosure - Retirement and Other Employee Benefits (Weighted Average Assumptions Used to Determine Net Periodic Benefit Cost) (Details) Sheet http://www.assurant.com/role/RetirementandOtherEmployeeBenefitsWeightedAverageAssumptionsUsedtoDetermineNetPeriodicBenefitCostDetails Retirement and Other Employee Benefits (Weighted Average Assumptions Used to Determine Net Periodic Benefit Cost) (Details) Details http://www.assurant.com/role/RetirementandOtherEmployeeBenefitsTables 160 false false R161.htm 9955626 - Disclosure - Retirement and Other Employee Benefits (Health Care Cost Trend Rates) (Details) Sheet http://www.assurant.com/role/RetirementandOtherEmployeeBenefitsHealthCareCostTrendRatesDetails Retirement and Other Employee Benefits (Health Care Cost Trend Rates) (Details) Details http://www.assurant.com/role/RetirementandOtherEmployeeBenefitsTables 161 false false R162.htm 9955627 - Disclosure - Retirement and Other Employee Benefits (Fair Value Hierarchy for Plan Assets) (Details) Sheet http://www.assurant.com/role/RetirementandOtherEmployeeBenefitsFairValueHierarchyforPlanAssetsDetails Retirement and Other Employee Benefits (Fair Value Hierarchy for Plan Assets) (Details) Details http://www.assurant.com/role/RetirementandOtherEmployeeBenefitsTables 162 false false R163.htm 9955628 - Disclosure - Retirement and Other Employee Benefits (Estimated Future Benefit Payments From the Plans) (Details) Sheet http://www.assurant.com/role/RetirementandOtherEmployeeBenefitsEstimatedFutureBenefitPaymentsFromthePlansDetails Retirement and Other Employee Benefits (Estimated Future Benefit Payments From the Plans) (Details) Details http://www.assurant.com/role/RetirementandOtherEmployeeBenefitsTables 163 false false R164.htm 9955629 - Disclosure - Earnings Per Common Share (Net Income, Weighted Average Common Shares Used in Calculating Basic Earnings Per Common Share and Diluted EPS) (Details) Sheet http://www.assurant.com/role/EarningsPerCommonShareNetIncomeWeightedAverageCommonSharesUsedinCalculatingBasicEarningsPerCommonShareandDilutedEPSDetails Earnings Per Common Share (Net Income, Weighted Average Common Shares Used in Calculating Basic Earnings Per Common Share and Diluted EPS) (Details) Details http://www.assurant.com/role/EarningsPerCommonShareTables 164 false false R165.htm 9955630 - Disclosure - Earnings Per Common Share (Narrative) (Details) Sheet http://www.assurant.com/role/EarningsPerCommonShareNarrativeDetails Earnings Per Common Share (Narrative) (Details) Details http://www.assurant.com/role/EarningsPerCommonShareTables 165 false false R166.htm 9955631 - Disclosure - Restructuring and Related Impairment Charges (Narrative) (Details) Sheet http://www.assurant.com/role/RestructuringandRelatedImpairmentChargesNarrativeDetails Restructuring and Related Impairment Charges (Narrative) (Details) Details http://www.assurant.com/role/RestructuringandRelatedImpairmentChargesTables 166 false false R167.htm 9955632 - Disclosure - Restructuring and Related Impairment Charges (Restructuring and Related Costs) (Details) Sheet http://www.assurant.com/role/RestructuringandRelatedImpairmentChargesRestructuringandRelatedCostsDetails Restructuring and Related Impairment Charges (Restructuring and Related Costs) (Details) Details http://www.assurant.com/role/RestructuringandRelatedImpairmentChargesTables 167 false false R168.htm 9955633 - Disclosure - Restructuring and Related Impairment Charges (Rollforward of Accrued Liability) (Details) Sheet http://www.assurant.com/role/RestructuringandRelatedImpairmentChargesRollforwardofAccruedLiabilityDetails Restructuring and Related Impairment Charges (Rollforward of Accrued Liability) (Details) Details http://www.assurant.com/role/RestructuringandRelatedImpairmentChargesTables 168 false false R169.htm 9955634 - Disclosure - Commitments and Contingencies (Narrative) (Details) Sheet http://www.assurant.com/role/CommitmentsandContingenciesNarrativeDetails Commitments and Contingencies (Narrative) (Details) Details http://www.assurant.com/role/CommitmentsandContingenciesTables 169 false false R170.htm 9955635 - Disclosure - Commitments and Contingencies (Future Minimum Lease Payments for Operating Leases) (Details) Sheet http://www.assurant.com/role/CommitmentsandContingenciesFutureMinimumLeasePaymentsforOperatingLeasesDetails Commitments and Contingencies (Future Minimum Lease Payments for Operating Leases) (Details) Details http://www.assurant.com/role/CommitmentsandContingenciesTables 170 false false R171.htm 9955636 - Disclosure - Schedule I ??? Summary of Investments - Other Than Investments in Related Parties (Details) Sheet http://www.assurant.com/role/ScheduleISummaryofInvestmentsOtherThanInvestmentsinRelatedPartiesDetails Schedule I ??? Summary of Investments - Other Than Investments in Related Parties (Details) Details http://www.assurant.com/role/ScheduleISummaryofInvestmentsOtherThanInvestmentsinRelatedParties 171 false false R172.htm 9955637 - Disclosure - Schedule II ??? Condensed Financial Statements (Parent Only) - Balance Sheet (Details) Sheet http://www.assurant.com/role/ScheduleIICondensedFinancialStatementsParentOnlyBalanceSheetDetails Schedule II ??? Condensed Financial Statements (Parent Only) - Balance Sheet (Details) Details http://www.assurant.com/role/ScheduleIICondensedFinancialStatementsParentOnly 172 false false R173.htm 9955638 - Disclosure - Schedule II ??? Condensed Financial Statements (Parent Only) - Balance Sheet (Additional Information) (Details) Sheet http://www.assurant.com/role/ScheduleIICondensedFinancialStatementsParentOnlyBalanceSheetAdditionalInformationDetails Schedule II ??? Condensed Financial Statements (Parent Only) - Balance Sheet (Additional Information) (Details) Details http://www.assurant.com/role/ScheduleIICondensedFinancialStatementsParentOnly 173 false false R174.htm 9955639 - Disclosure - Schedule II ??? Condensed Financial Statements (Parent Only) - Income Statement (Details) Sheet http://www.assurant.com/role/ScheduleIICondensedFinancialStatementsParentOnlyIncomeStatementDetails Schedule II ??? Condensed Financial Statements (Parent Only) - Income Statement (Details) Details http://www.assurant.com/role/ScheduleIICondensedFinancialStatementsParentOnly 174 false false R175.htm 9955640 - Disclosure - Schedule II ??? Condensed Financial Statements (Parent Only) - Comprehensive Income (Details) Sheet http://www.assurant.com/role/ScheduleIICondensedFinancialStatementsParentOnlyComprehensiveIncomeDetails Schedule II ??? Condensed Financial Statements (Parent Only) - Comprehensive Income (Details) Details http://www.assurant.com/role/ScheduleIICondensedFinancialStatementsParentOnly 175 false false R176.htm 9955641 - Disclosure - Schedule II ??? Condensed Financial Statements (Parent Only) - Comprehensive Income (Additional Information) (Details) Sheet http://www.assurant.com/role/ScheduleIICondensedFinancialStatementsParentOnlyComprehensiveIncomeAdditionalInformationDetails Schedule II ??? Condensed Financial Statements (Parent Only) - Comprehensive Income (Additional Information) (Details) Details http://www.assurant.com/role/ScheduleIICondensedFinancialStatementsParentOnly 176 false false R177.htm 9955642 - Disclosure - Schedule II ??? Condensed Financial Statements (Parent Only) - Cash Flows (Details) Sheet http://www.assurant.com/role/ScheduleIICondensedFinancialStatementsParentOnlyCashFlowsDetails Schedule II ??? Condensed Financial Statements (Parent Only) - Cash Flows (Details) Details http://www.assurant.com/role/ScheduleIICondensedFinancialStatementsParentOnly 177 false false R178.htm 9955643 - Disclosure - Schedule III - Supplementary Insurance Information (Details) Sheet http://www.assurant.com/role/ScheduleIIISupplementaryInsuranceInformationDetails Schedule III - Supplementary Insurance Information (Details) Details http://www.assurant.com/role/ScheduleIIISupplementaryInsuranceInformation 178 false false R179.htm 9955644 - Disclosure - Schedule IV ??? Reinsurance (Details) Sheet http://www.assurant.com/role/ScheduleIVReinsuranceDetails Schedule IV ??? Reinsurance (Details) Details http://www.assurant.com/role/ScheduleIVReinsurance 179 false false R180.htm 9955645 - Disclosure - Schedule V ??? Valuation and Qualifying Accounts (Details) Sheet http://www.assurant.com/role/ScheduleVValuationandQualifyingAccountsDetails Schedule V ??? Valuation and Qualifying Accounts (Details) Details http://www.assurant.com/role/ScheduleVValuationandQualifyingAccounts 180 false false All Reports Book All Reports aiz-20251231.htm aiz-20251231.xsd aiz-20251231_cal.xml aiz-20251231_def.xml aiz-20251231_lab.xml aiz-20251231_pre.xml aiz-20251231_g1.jpg http://fasb.org/srt/2025 http://fasb.org/us-gaap/2025 http://xbrl.sec.gov/cyd/2025 http://xbrl.sec.gov/dei/2025 http://xbrl.sec.gov/ecd/2025 true true