Entity tax identification number Entity Tax Identification Number Maximum Maximum [Member] Less: Change in deemed distributions EBP, Reconciliation to Form 5500, Change in Net Asset Available for Benefit, Increase (Decrease) from Deemed Distribution Legal Entity [Axis] Legal Entity [Axis] Statistical Measurement [Domain] Statistical Measurement [Domain] EBP, Description of Plan [Table] EBP, Description of Plan [Table] Mutual funds Mutual Fund [Member] EBP, Related Party and Party-in-Interest Transactions [Table] EBP, Related Party and Party-in-Interest Transactions [Table] Total deductions EBP, Change in Net Asset Available for Benefit, Decrease Maximum borrowing amount EBP, Note Receivable from Participant, Account, Maximum Borrowing, Amount Fair Value Measurements EBP, Investment, Fair Value and NAV [Text Block] Minimum borrowing amount EBP, Note Receivable from Participant, Account, Minimum Borrowing, Amount Other EBP, Change in Net Asset Available for Benefit, Other Increase EBP, Change in Net Asset Available for Benefit, Other Increase Investments, at fair value Total financial assets EBP, Investment, Excluding Plan Interest in Master Trust, Fair Value Money market funds Money Market Funds [Member] Level 1 Fair Value, Inputs, Level 1 [Member] Annual increase deferral rate EBP, Participant Contribution, Automatic, Annual Increase Deferral Rate Annual increase in percentage of eligible compensation contributed for participant automatically enrolled in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)) until the contribution reaches maximum threshold. Schedule of Reconciliation of Financial Statement to Form 5500 EBP, Reconciliation of Financial Statement to Form 5500 [Table Text Block] EBP, Investment, Fair Value and NAV [Abstract] Total assets EBP, Asset Assets EBP, Asset [Abstract] Statistical Measurement [Axis] Statistical Measurement [Axis] Additions EBP, Change in Net Asset Available for Benefit, Increase [Abstract] EBP, Statement of Change in Net Asset Available for Benefit [Table] EBP, Statement of Change in Net Asset Available for Benefit [Table] Payment of Benefits EBP, Payment to Participant [Policy Text Block] Trustee EBP, Trustee [Member] Amendment Flag Amendment Flag Employee EBP, Change in Net Asset Available for Benefit, Increase from Participant Contribution Less: Deemed distributions EBP, Reconciliation to Form 5500, Net Asset Available for Benefit, Deemed Distribution Basis of Accounting EBP, Basis of Accounting [Policy Text Block] EBP, Schedule of Asset Held for Investment [Table] EBP, Schedule of Asset Held for Investment [Table] Investment, number of common stock (in shares) Investment, number of shares (in shares) EBP, Investment, Number of Shares EBP, Description of Plan and Accounting Change [Abstract] Receivables: EBP, Receivable [Abstract] Schedule of Fair Value Hierarchy for Assets Measured at Fair Value on Recurring Basis EBP, Investment, Fair Value and NAV [Table Text Block] Payment of maintenance fees EBP, Change in Net Asset Available for Benefit, Payment Of Maintenance Fees EBP, Change in Net Asset Available for Benefit, Payment Of Maintenance Fees Investments [Domain] Investments [Domain] Use of Estimates EBP, Use of Estimate [Policy Text Block] Vesting percentage EBP, Employer Contribution Vesting Percentage Company contribution and/ or investment earning percentage vesting to the participant in Company Matching Contributions, Fixed Rate Contributions, Discretionary Profit-Sharing Contributions, Qualified Non-Elective Contributions, and Disability Contributions, upon completion of minimum service period or attainment of maximum vesting age EBP, Related Party and Party-in-Interest [Domain] EBP, Related Party and Party-in-Interest [Domain] Schedule H, Line 4(i) - Schedule of Assets (Held at End of Year) EBP, Schedule of Asset Held for Investment [Text Block] Cover [Abstract] Annual compensation to total compensation, percentage EBP, Participant Contribution, Annual Compensation To Total Compensation, Percentage EBP, Participant Contribution, Annual Compensation To Total Compensation, Percentage Risk and Uncertainties EBP, Risk and Uncertainty [Text Block] Employer EBP, Change in Net Asset Available for Benefit, Increase from Employer Contribution, Cash EBP, Related Party and Party-in-Interest [Axis] EBP, Related Party and Party-in-Interest [Axis] Minimum Minimum [Member] Investment Type [Axis] Investment Type [Axis] Interest from notes receivable from participants EBP, Change in Net Asset Available for Benefit, Increase from Interest Income on Note Receivable from Participant Total contributions EBP, Change in Net Asset Available for Benefit, Increase from Contribution Net appreciation in fair value of investments EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Gain (Loss) on Investment Dividends and interest EBP, Change in Net Asset Available for Benefit, Increase from Interest and Dividend Income on Investment EBP, Description of Plan [Line Items] EBP, Description of Plan [Line Items] Plan number EBP, Plan Number EBP, Investment, Fair Value and NAV [Line Items] EBP, Investment, Fair Value and NAV [Line Items] Description of the Plan EBP, Description of Plan [Text Block] EBP, Statement of Change in Net Asset Available for Benefit [Line Items] EBP, Statement of Change in Net Asset Available for Benefit [Line Items] EBP, Schedule of Asset Held for Investment [Line Items] EBP, Schedule of Asset Held for Investment [Line Items] Assurant, Inc. common stock EBP, Employer, Common Stock [Member] EBP, Schedule of Asset Held for Investment [Abstract] EBP, Accounting Policy [Table] EBP, Accounting Policy [Table] Total additions EBP, Change in Net Asset Available for Benefit, Increase Borrowing term EBP, Note Receivable From Participant, Account ,Borrowing Term EBP, Note Receivable From Participant, Account ,Borrowing Term Investment income: EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Income (Loss) on Investment [Abstract] Document [Domain] Document [Domain] Investment, Identifier [Axis] Investment, Identifier [Axis] Administrative expenses EBP, Change in Net Asset Available for Benefit, Decrease from Administrative Expense Document Information [Line Items] Document Information [Line Items] Basis spread on variable rate EBP, Participant Loan, Basis Spread On Variable Rate EBP, Participant Loan, Basis Spread On Variable Rate EBP, Risk and Uncertainty [Line Items] EBP, Risk and Uncertainty [Line Items] EBP 002 EBP 002 [Member] EBP 002 EBP, Risk and Uncertainty [Table] EBP, Risk and Uncertainty [Table] Realized gains (losses) from investments EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Realized Gain (Loss) on Investment Participant compensation matched, percentage EBP, Employer Contribution, Participant Compensation Matched, Percentage EBP, Statement of Change in Net Asset Available for Benefit [Abstract] Level 2 Fair Value, Inputs, Level 2 [Member] Maximum borrowing term for the purchase of primary residence EBP, Note Receivable From Participant, Account, Primary Residence, Maximum Borrowing Term EBP, Note Receivable From Participant, Account, Primary Residence, Maximum Borrowing Term Maximum common stock to total asset, percentage EBP, Investment, Employer, Common Stock, to Total Asset, Percentage Number of loans allowed EBP, Note Receivable From Participant, Number Of Loans Allowed EBP, Note Receivable From Participant, Number Of Loans Allowed Net income per Form 5500 EBP, Form 5500 Caption, Net Income (Loss) Participant contribution, required employment period EBP, Participant Contribution, Required Employment Period EBP, Participant Contribution, Required Employment Period EBP, Tax Status [Table] EBP, Tax Status [Table] Net increase Net increase EBP, Change in Net Asset Available for Benefit, Increase (Decrease) Related Parties EBP, Related Party and Party-in-Interest Transactions [Text Block] EBP, Related Party and Party-in-Interest Transactions [Abstract] EBP, Accounting Policy, Accounting Standard Update, and Change in Accounting Principle [Abstract] Other payables EBP, Excess Contribution Payable Total receivables EBP, Receivable Employer contributions EBP, Employer Contribution, Receivable Unrealized gains (losses) from investments EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Unrealized Gain (Loss) on Investment Automatic deferral rate EBP, Participant Contribution, Automatic, Deferral Rate Dividend income on investment EBP, Change in Net Asset Available for Benefit, Increase from Dividend Income on Investment Benefits paid to participants EBP, Change in Net Asset Available for Benefit, Decrease from Payment to Participant Investment, current value EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Current Value Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] EBP, Accounting Policy [Line Items] EBP, Accounting Policy [Line Items] EBP, Tax Status [Abstract] EBP, Reconciliation of Financial Statement to Form 5500 [Table] EBP, Reconciliation of Financial Statement to Form 5500 [Table] Forfeitures used to reduce administrative expenses and employer contribution EBP, Forfeited Nonvested Account, Decrease from Administrative Expense And Employer Contribution EBP, Forfeited Nonvested Account, Decrease from Administrative Expense And Employer Contribution EBP, Reconciliation of Financial Statement to Form 5500 [Line Items] EBP, Reconciliation of Financial Statement to Form 5500 [Line Items] Reconciliation of Plan Financial Statements to Form 5500 EBP, Reconciliation of Financial Statement to Form 5500 [Text Block] Notes receivable from participants, current value EBP, Asset Held for Investment, Participant Loan, after Deemed Distribution Use of Estimates and Income Recognition EBP, Investment [Policy Text Block] Fair Value, Inputs, Level 1, Level 2, and Level 3 Fair Value, Inputs, Level 1, Level 2, and Level 3 [Member] Document Type Document Type Custodian EBP, Other Related Party and Party-in-Interest [Member] Plan Termination EBP, Plan Termination [Text Block] Entity Central Index Key Entity Central Index Key Participant loan, interest rate Interest rate EBP, Asset Held for Investment, Participant Loan, Interest Rate EBP, Reconciliation of Financial Statement to Form 5500 [Abstract] Collective investment trusts Common Collective Trust [Member] Net assets available for benefits EBP, Net Asset Available for Benefit [Abstract] EBP, Risk and Uncertainty [Abstract] EBP, Tax Status [Line Items] EBP, Tax Status [Line Items] EBP, Subsequent Event [Table] EBP, Subsequent Event [Table] Deductions EBP, Change in Net Asset Available for Benefit, Decrease [Abstract] Notes receivable from participants EBP, Note Receivable from Participant Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Significant Accounting Policies EBP, Summary of Accounting Policy [Text Block] Entity Registrant Name Entity Registrant Name Concentration of investment at fair value to net assets, percentage EBP, Risk and Uncertainty, Concentration of Investment at Fair Value to Net Assets, Percentage EBP, Subsequent Event [Abstract] Liabilities EBP, Liability [Abstract] Subsequent Events EBP, Subsequent Event [Text Block] Income Tax Status EBP, Tax Status [Text Block] Maximum borrowing of vested account balance, percentage EBP, Note Receivable from Participant, Account, Maximum Borrowing, to Total Account, Percentage EBP, Subsequent Event [Line Items] EBP, Subsequent Event [Line Items] Document Information [Table] Document Information [Table] Participant Loans EBP, Note Receivable from Participant [Policy Text Block] Total investment income EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Income (Loss) on Investment Cash dividends, vesting percentage EBP, Investment, Cash Dividends, Vesting Percentage EBP, Investment, Cash Dividends, Vesting Percentage EBP, Related Party and Party-in-Interest Transactions [Line Items] EBP, Related Party and Party-in-Interest Transactions [Line Items] Level 3 Fair Value, Inputs, Level 3 [Member] Other receivables EBP, Other Receivable Net assets available for benefits Beginning of year End of year Net assets available for benefits EBP, Net Asset Available for Benefit Entity [Domain] Entity [Domain] Contributions: EBP, Change in Net Asset Available for Benefit, Increase from Contribution [Abstract] Remaining forfeitures balance EBP, Forfeited Nonvested Account Employer contribution, matching percentage EBP, Employer Contribution, Matching Percentage Vesting service period EBP, Employer Contribution, Vesting Service Period Minimum Vesting service period for company contribution and/ or investment earning to the participant in Company Matching Contributions, Fixed Rate Contributions, Discretionary Profit-Sharing Contributions, Qualified Non-Elective Contributions, and Disability Contributions. Document Information, Document [Axis] Document Information, Document [Axis] Net assets available for benefits per Form 5500 EBP, Form 5500 Caption, Net Assets EBP, Investment, Fair Value and NAV [Table] EBP, Investment, Fair Value and NAV [Table]