2018 Term Loans 2018 Term Loans [Member] 2018 Term Loans Entity tax identification number Entity Tax Identification Number Maximum Maximum [Member] Employer contribution, discretionary, service period EBP, Employer Contribution, Discretionary, Non-Elective, Service Period EBP, Employer Contribution, Discretionary, Non-Elective, Service Period 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] 2027 EBP, Debt, Maturity, Year Two Company EBP, Employer [Member] EBP, Employer Debt, face amount EBP, Debt, Face Amount EBP, Debt, Face Amount EBP, Related Party and Party-in-Interest Transactions [Table] EBP, Related Party and Party-in-Interest Transactions [Table] EBP, Fully Benefit-Responsive Investment Contract [Table] EBP, Fully Benefit-Responsive Investment Contract [Table] Notes payable Total EBP, Debt Total deductions EBP, Change in Net Asset Available for Benefit, Decrease 2020 Term Loans 2020 Term Loans [Member] 2020 Term Loans Maximum borrowing, amount EBP, Note Receivable from Participant, Account, Maximum Borrowing, Amount Minimum borrowing, amount EBP, Note Receivable from Participant, Account, Minimum Borrowing, Amount Interfund transfers EBP, Change In Net Assets Available For Benefit, Interfund Transfers EBP, Change In Net Assets Available For Benefit, Interfund Transfers Unpaid administrative expenses EBP, Accrued Expense 2028 EBP, Debt, Maturity, Year Three Related party transaction fees EBP, Related Party Transaction Fees EBP, Related Party Transaction Fees EBP, Fully Benefit-Responsive Investment Contract [Abstract] Debt Instrument [Axis] Debt Instrument [Axis] Total investments EBP, Investment, Excluding Plan Interest in Master Trust, Fair Value Vesting percentage, graded EBP, Employer Contribution Vesting Percentage, Graded EBP, Employer Contribution Vesting Percentage, Graded Participant contributions, after tax, annual maximum EBP, Participant Contributions, After Tax, Annual Maximum EBP, Participant Contributions, After Tax, Annual Maximum Common shares released to participants (in dollars per share) EBP, Common Shares Released To Participants, Per Share EBP, Common Shares Released To Participants, Per Share Excess Contributions Payable EBP, Excess Contribution Payable [Policy Text Block] TOTAL ASSETS EBP, Asset ASSETS: EBP, Asset [Abstract] Statistical Measurement [Axis] Statistical Measurement [Axis] Additions (Reductions): 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] Termination and Withdrawal Benefit Payments EBP, Payment to Participant [Policy Text Block] Transfer from merged-in plan EBP, Change in Net Asset Available for Benefit, Transfer to (from) Plan TOTAL LIABILITIES EBP, Liability Amendment Flag Amendment Flag Number of loans EBP, Note Receivable from Participant, Account, Maximum Borrowing, Number EBP, Note Receivable from Participant, Account, Maximum Borrowing, Number Employee contributions EBP, Change in Net Asset Available for Benefit, Increase from Participant Contribution 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] Funds in course of settlement EBP, Investment Sale, Receivable Number of Shares/Units (in shares) EBP, Investment, Number of Shares EBP, Description of Plan and Accounting Change [Abstract] Receivables: EBP, Receivable [Abstract] EBP, Contingency [Table] EBP, Contingency [Table] Investments EBP, Investment [Text Block] EBP, Investment Participant-Directed EBP, Participant-Directed [Member] EBP, Contingency [Abstract] Common shares released to participants EBP, Change in Net Asset Available for Benefit, Increase From Common Shares Released To Participants EBP, Change in Net Asset Available for Benefit, Increase From Common Shares Released To Participants Investments [Domain] Investments [Domain] Service period for divestiture of company stock, employer contributions before 2025 EBP, Service Period For Divestiture Of Company Stock, Employer Contributions Before 2025 EBP, Service Period For Divestiture Of Company Stock, Employer Contributions Before 2025 Use of Estimates EBP, Use of Estimate [Policy Text Block] EBP, Related Party and Party-in-Interest [Domain] EBP, Related Party and Party-in-Interest [Domain] Schedule H, Line 4i – Schedule of Assets (Held At End of Year) EBP, Schedule of Asset Held for Investment [Text Block] Cover [Abstract] Maximum vesting age EBP, Employer Contribution Maximum Vesting Age Maximum Vesting age of participant for company contribution and/ or investment earning in Company Matching Contributions, Fixed Rate Contributions, Discretionary Profit-Sharing Contributions, Qualified Non-Elective Contributions, and Disability Contributions. Employer contributions EBP, Change in Net Asset Available for Benefit, Increase from Employer Contribution, Cash Total Investments, at Fair Value Investments At Fair Value [Member] Investments At Fair Value Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Debt term EBP, Debt, Term EBP, Debt, Term Employer Matching Contribution Formula [Domain] Employer Matching Contribution Formula [Domain] Employer Matching Contribution Formula Minimum Minimum [Member] EBP, Related Party and Party-in-Interest [Axis] EBP, Related Party and Party-in-Interest [Axis] Accrued interest and dividends EBP, Investment Income, Receivable Investment Type [Axis] Investment Type [Axis] Objective Objective [Member] Objective EBP, Description of Plan [Line Items] EBP, Description of Plan [Line Items] 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 Plan number EBP, Plan Number 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, Statement of Net Asset Available for Benefit [Table] EBP, Statement of Net Asset Available for Benefit [Table] Common stock released (in shares) EBP, Common Stock Released, Number of Shares EBP, Common Stock Released, Number of Shares EBP, Schedule of Asset Held for Investment [Line Items] EBP, Schedule of Asset Held for Investment [Line Items] Interest income EBP, Change in Net Asset Available for Benefit, Increase from Interest Income on Investment Contributions EBP, Contribution [Policy Text Block] Common stocks 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 Notes Payable EBP, Debt [Text Block] Short-term investments Short-Term Investments [Member] Investment, Identifier [Axis] Investment, Identifier [Axis] Administrative expenses EBP, Change in Net Asset Available for Benefit, Decrease from Administrative Expense TOTAL INVESTMENTS HELD EBP, Asset Held for Investment Employer Matching Contribution EBP, Employer Matching Contribution [Member] EBP, Employer Matching Contribution Risks and Uncertainties EBP, Risk and Uncertainty [Policy Text Block] Document Information [Line Items] Document Information [Line Items] Vesting service period, graded EBP, Employer Contribution Vesting Service Period, Graded EBP, Employer Contribution Vesting Service Period, Graded Vesting 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. NET ASSETS AVAILABLE FOR BENEFITS: EBP, Change in Net Asset Available for Benefit, Increase (Decrease) [Abstract] EBP 002 EBP 002 [Member] EBP 002 EBP, Risk and Uncertainty [Line Items] EBP, Risk and Uncertainty [Line Items] Annual variable rate contribution, percentage EBP, Employer Contribution, Annual Variable Rate Contribution, Percentage EBP, Employer Contribution, Annual Variable Rate Contribution, Percentage EBP, Employer Contribution, Type [Domain] EBP, Employer Contribution, Type [Domain] EBP, Employer Contribution, Type [Domain] EBP, Risk and Uncertainty [Table] EBP, Risk and Uncertainty [Table] Participant compensation matched, percentage EBP, Employer Contribution, Participant Compensation Matched, Percentage EBP, Statement of Change in Net Asset Available for Benefit [Abstract] Common shares released to participants (in shares) EBP, Common Shares Released To Participants EBP, Common Shares Released To Participants Discretionary contribution, percentage EBP, Employer Contribution, Discretionary, Non-Elective, Percentage EBP, Employer Contribution, Discretionary, Non-Elective, Percentage EBP, Employer Contribution, Type [Axis] EBP, Employer Contribution, Type [Axis] EBP, Employer Contribution, Type Common stock unallocated (in shares) EBP, Common Stock Unallocated, Number of Shares EBP, Common Stock Unallocated, Number of Shares EBP, Fully Benefit-Responsive Investment Contract [Line Items] EBP, Fully Benefit-Responsive Investment Contract [Line Items] Employer contributions EBP, Change in Net Asset Available for Benefit, Increase from Employer Contribution, Cash and Noncash EBP, Allocation Status [Domain] EBP, Allocation Status [Domain] EBP, Tax Status [Table] EBP, Tax Status [Table] Net additions EBP, Change in Net Asset Available for Benefit, Increase (Decrease) Related Parties and Parties in Interest EBP, Related Party and Party-in-Interest Transactions [Text Block] 2030 EBP, Debt, Maturity, Year Five EBP, Related Party and Party-in-Interest Transactions [Abstract] EBP, Accounting Policy, Accounting Standard Update, and Change in Accounting Principle [Abstract] EBP, Accounting Policy, Accounting Standard Update, and Change in Accounting Principle [Abstract] Total receivables EBP, Receivable Text Block [Abstract] Contributions from employers EBP, Employer Contribution, Receivable Net appreciation in value of 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 Investments, at fair value: EBP, Investment, Fair Value [Abstract] Common shares released to participants EBP, Change in Net Asset Available for Benefit, Decrease From Common Shares Released To Participants EBP, Change in Net Asset Available for Benefit, Decrease From Common Shares Released To Participants Termination and withdrawal benefits EBP, Change in Net Asset Available for Benefit, Decrease from Payment to Participant Dividend income EBP, Change in Net Asset Available for Benefit, Increase from Dividend Income on Investment Scheduled Loan Maturities EBP, Debt [Table Text Block] Interest expense EBP, Change in Net Asset Available for Benefit, Decrease from Interest Expense on Debt TOTAL INVESTMENTS EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Current Value Debt, released for ESOP, number of shares (in shares) EBP, Debt, Released for ESOP, Number of Shares EBP, Statement of Net Asset Available for Benefit [Abstract] EBP, Accounting Policy [Line Items] EBP, Accounting Policy [Line Items] Threshold Threshold [Member] Threshold EBP, Tax Status [Abstract] Schedule of Matching Contributions EBP, Contribution [Table Text Block] Debt, interest rate EBP, Debt, Interest Rate Administrative Expenses EBP, Expense [Policy Text Block] Participant loan, current value EBP, Asset Held for Investment, Participant Loan, after Deemed Distribution Investment Valuation and Income Recognition EBP, Investment [Policy Text Block] Document Type Document Type Termination Priorities EBP, Plan Termination [Text Block] Entity Central Index Key Entity Central Index Key Non-participant directed shares (in shares) EBP, Non-participant Directed Shares EBP, Non-participant Directed Shares Participant loan, interest rate EBP, Asset Held for Investment, Participant Loan, Interest Rate EBP, Tax Status [Line Items] EBP, Tax Status [Line Items] Participating Subsidiary Companies EBP, Subsidiary Companies [Member] EBP, Subsidiary Companies Deductions: EBP, Change in Net Asset Available for Benefit, Decrease [Abstract] Forfeited nonvested account, decrease from employer contribution EBP, Forfeited Nonvested Account, Decrease from Employer Contribution Non-participant directed shares, value EBP, Non-participant Directed Shares, Value EBP, Non-participant Directed Shares, Value Notes receivable from participants EBP, Note Receivable from Participant Nondiscrimination Refunds EBP, Nondiscrimination Refunds [Text Block] EBP, Nondiscrimination Refunds Summary of Accounting Policies EBP, Summary of Accounting Policy [Text Block] Entity Registrant Name Entity Registrant Name Unallocated EBP, Unallocated [Member] LIABILITIES: EBP, Liability [Abstract] Cost EBP, Investment, Excluding Plan Interest in Master Trust, Cost Subsequent Events EBP, Subsequent Event [Policy Text Block] Tax Status EBP, Tax Status [Text Block] EBP, Allocation Status [Axis] EBP, Allocation Status [Axis] Maximum borrowing, to total account, percentage EBP, Note Receivable from Participant, Account, Maximum Borrowing, to Total Account, Percentage EBP, Participant-Directed and Nonparticipant-Directed Status [Domain] EBP, Participant-Directed and Nonparticipant-Directed Status [Domain] EBP, Contingency [Line Items] EBP, Contingency [Line Items] EBP, Participant-Directed and Nonparticipant-Directed Status [Axis] EBP, Participant-Directed and Nonparticipant-Directed Status [Axis] Document Information [Table] Document Information [Table] 2026 EBP, Debt, Maturity, Year One Nonparticipant-Directed EBP, Nonparticipant-Directed [Member] Discretionary Contribution EBP, Discretionary Contribution [Member] EBP, Discretionary Contribution Notes Receivable from Participants EBP, Note Receivable from Participant [Policy Text Block] 2029 EBP, Debt, Maturity, Year Four Basis spread on variable rate EBP, Participant Loan, Basis Spread On Variable Rate EBP, Participant Loan, Basis Spread On Variable Rate Nondiscrimination refunds payable EBP, Nondiscrimination Refunds Payable EBP, Nondiscrimination Refunds Payable EBP, Related Party and Party-in-Interest Transactions [Line Items] EBP, Related Party and Party-in-Interest Transactions [Line Items] Participant loan, cost EBP, Asset Held for Investment, Participant Loan, Cost EBP, Asset Held for Investment, Participant Loan, Cost Employer Matching Contribution Formula [Axis] Employer Matching Contribution Formula [Axis] Employer Matching Contribution Formula NET ASSETS AVAILABLE FOR BENEFITS Beginning of year End of year EBP, Net Asset Available for Benefit Entity [Domain] Entity [Domain] Annual Old Republic combined ratio achievement objective for the Plan year EBP, Annual Combined Ratio Achievement Objective, Percent EBP, Annual Combined Ratio Achievement Objective, Percent EBP, Statement of Net Asset Available for Benefit [Line Items] EBP, Statement of Net Asset Available for Benefit [Line Items] General loan, borrowing term EBP, Note Receivable From Participant, General Loan, Maximum Borrowing Term EBP, Note Receivable From Participant, General Loan, Maximum Borrowing Term