Genesis Legacy Solutions Genesis Legacy Solutions [Member] Genesis Legacy Solutions Accumulated Amortization Finite-Lived Intangible Assets, Accumulated Amortization Investments Investment, Policy [Policy Text Block] Debt and Equity Securities, FV-NI [Line Items] Debt and Equity Securities, FV-NI [Line Items] Award Timing Predetermined Award Timing Predetermined [Flag] Investment in direct lending entities Investments In Direct Lending Entities [Member] Investments In Direct Lending Entities Entity File Number Entity File Number Additional paid-in capital Additional Paid-in Capital [Member] Tabular List, Table Tabular List [Table Text Block] Recently Adopted Accounting Standards and Recently Issued Accounting Standards Not Yet Adopted New Accounting Pronouncements, Policy [Policy Text Block] 2019 Short-Duration Insurance Contract, Accident Year 2019 [Member] Schedule of Quota Share Arrangements with AmTrust Schedule of Related Party Transactions [Table Text Block] Schedule of Carrying Value and Fair Value of Senior Notes Fair Value, by Balance Sheet Grouping [Table Text Block] Change in unearned premiums (Increase) Decrease in Unearned Premiums, Net Measurement Basis [Axis] Measurement Basis [Axis] Adjustment to Compensation: Adjustment to Compensation [Axis] Related Party Transactions Related Party Transactions Disclosure [Text Block] Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Number of non-independent director Number Of Non-Independent Directors Number Of Non-Independent Directors Stock, Class of Stock [Table] Stock, Class of Stock [Table] Schedule of Statutory Capital and Surplus and Statutory Net Income (Loss) of Principal Operating Subsidiaries Statutory Accounting Practices Disclosure [Table Text Block] Assets held for sale Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed, Assets Held For Sale Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed, Assets Held For Sale Collateral held by related party Related Party Transaction, Collateral Held by Related Party Related Party Transaction, Collateral Held by Related Party Total current tax (benefit) expense Current Income Tax Expense (Benefit) Assets held for sale Total assets held for sale Disposal Group, Including Discontinued Operation, Assets Adjustment to Compensation, Amount Adjustment to Compensation Amount Concentration risk, percentage Concentration Risk, Percentage Exit Cap Rate Measurement Input, Cap Rate [Member] Less: unamortized fair value adjustment Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net Other assets Increase (Decrease) in Other Operating Assets Basis of Reporting and Consolidation Consolidation, Policy [Policy Text Block] Share Options Share-Based Payment Arrangement, Option [Member] Favorable PPD reinsurance Liability for Unpaid Claims and Claims Adjustment Expense, Period Decrease, Net of Commission Changes Liability for Unpaid Claims and Claims Adjustment Expense, Period Decrease, Net of Commission Changes Property, Plant and Equipment [Table] Property, Plant and Equipment [Table] Cash and Cash Equivalents Cash and Cash Equivalents, Policy [Policy Text Block] Cash paid for income taxes Income Taxes Paid Percent Effective Income Tax Rate Reconciliation, Percent [Abstract] Deposit contracts Deposit Contracts, Liabilities Distributions to shareholders Dividends, Common Stock, Cash Total shareholders’ equity Beginning balance Ending balance Cumulative translation adjustment Equity, Attributable to Parent Debt Securities, Available-for-sale [Table] Debt Securities, Available-for-Sale [Table] Insider Trading Policies and Procedures [Line Items] 2017 Short-Duration Insurance Contracts, Accident Year 2017 [Member] Common stock, shares authorized (in shares) Common Stock, Shares Authorized Schedule of Depreciable Fixed Assets Property, Plant and Equipment [Table Text Block] Issuance of vested restricted shares and exercised common share options (in shares) Stock Issued During Period, Shares, New Issues Value Change - Market/Industry Factors Measurement Input, Change in Guideline Public Company TIC [Member] Measurement Input, Change in Guideline Public Company TIC Gain Contingencies [Table] Gain Contingencies [Table] Funds withheld receivable (Allowance for expected credit losses: 2025 - $2) Funds withheld receivable Funds Held under Reinsurance Agreements, Asset Reinsurance balances receivable, net (includes $2 from related parties in 2025. Allowance for expected credit losses: 2025 - $14) Reinsurance balances receivable, net Premiums Receivable, Net Cover [Abstract] Cover [Abstract] Portion at Fair Value Measurement Portion at Fair Value Measurement [Member] Assets Held for Sale Disposal Groups, Including Discontinued Operations, Disclosure [Text Block] Kestrel Group Ltd shares retained as treasury shares by Maiden Reinsurance at Closing (in shares) Business Combination, Consideration Transferred, Equity Interests Issued and Issuable, Treasury Shares Retained Business Combination, Consideration Transferred, Equity Interests Issued and Issuable, Treasury Shares Retained Maximum High Maximum [Member] Total exercisable (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Weighted Average Exercise Price As a percentage of total assets Percent of Assets Measured at Fair Value to Total Assets Percent of Assets Measured at Fair Value to Total Assets AmTrust European Hospital Liability Quota Share Agreement AmTrust European Hospital Liability Quota Share Agreement [Member] AmTrust European Hospital Liability Quota Share Agreement [Member] Loss and LAE Policyholder Benefits and Claims Incurred, Net [Abstract] Collateral Debt Instrument, Collateral Amount Kestrel Group Kestrel Group [Member] Kestrel Group Restricted Shares Restricted Stock [Member] Net adverse PPD for Legacy Reinsurance Segment Net adverse PPD reinsurance Total Diversified Reinsurance adverse PPD Total AmTrust Reinsurance favorable PPD Liability for Unpaid Claims and Claims Adjustment Expense, Period Increase (Decrease), Net of Commission Changes Liability for Unpaid Claims and Claims Adjustment Expense, Period Increase (Decrease), Net of Commission Changes Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount Debt Instrument [Line Items] Debt Instrument [Line Items] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Schedule of Restricted Share Awards Share-Based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity [Table Text Block] Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] Direct Direct Premiums Earned Credit Rating [Domain] External Credit Rating, Standard & Poor's [Domain] Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount Gain on bargain purchase Gain on bargain purchase option Gain on bargain purchase Gain on bargain purchase Bargain purchase gain Business Combination, Bargain Purchase, Gain Recognized, Amount Non-Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated [Flag] Total income (loss) before income taxes Income (loss) before income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Entity Shell Company Entity Shell Company Schedule of Long-term Debt Instruments [Table] Schedule of Long-Term Debt Instruments [Table] Reserve for loss and loss adjustment expenses Increase (Decrease) in Liability for Claims and Claims Adjustment Expense Reserve Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Operating Segments Operating Segments [Member] Schedule of Income Tax Paid Schedule of Cash Flow, Supplemental Disclosures [Table Text Block] Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Reclassification out of Accumulated Other Comprehensive Income [Table] Reclassification out of Accumulated Other Comprehensive Income [Table] Net income (loss) from continuing operations Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent Letter of Credit Letter of Credit [Member] Income before income taxes – Domestic (Bermuda) Income (Loss) from Continuing Operations before Income Taxes, Domestic Expenses from related party transactions Management Fee Expense Acquire option term Business Acquisition, Option Term Business Acquisition, Option Term Solvency ratio Related Party Transaction, Solvency Ratio Related Party Transaction, Solvency Ratio Document Fiscal Period Focus Document Fiscal Period Focus Foreign currency translation adjustment Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax, Portion Attributable to Parent Intangible assets Intangible assets Intangible Assets, Net (Including Goodwill) Purchase significant reinsurance for losses above Short Duration Insurance Contracts, Minimum Losses Purchased Short Duration Insurance Contracts, Minimum Losses Purchased Award Timing Method Award Timing Method [Text Block] Litigation Case [Domain] Litigation Case [Domain] Schedule of Fixed Maturities Table [Line Items] Schedule of Fixed Maturities Table [Line Items] [Line Items] for Schedule of Fixed Maturities Table [Table] Basic earnings (loss) from continuing operations per share attributable to Kestrel common shareholders (in dollars per share) Income (Loss) from Continuing Operations, Per Basic Share Net unrealized gains on fixed maturity investments Investments, Net Unrealized Gain (Loss) Investments, Net Unrealized Gain (Loss) Award Type [Axis] Award Type [Axis] Interest and amortization expenses Interest and amortization expenses Interest and Amortization Expenses, Net Interest and Amortization Expenses, Net Foreign currency translation adjustments Accumulated Foreign Currency Adjustment Attributable to Parent [Member] Selected Financial Information, Pro Forma Business Combination, Pro Forma Information [Table Text Block] Investment, Name [Domain] Investment, Name [Domain] Share-Based Compensation Expense Share-Based Payment Arrangement [Policy Text Block] Trading Symbol Trading Symbol 2029 Lessee, Operating Lease, Liability, to be Paid, Year Four Accounting Treatment for the Combination Business Combination [Policy Text Block] Valuation allowance in respect of U.S. taxes Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Percent Operating Loss Carryforwards [Table] Operating Loss Carryforwards [Table] Gross loss and LAE Policyholder Benefits and Claims Incurred, Direct Accrued expenses and other liabilities (includes $16,443 and $0 from related parties in 2025 and 2024, respectively) Accrued expenses and other liabilities Accrued Liabilities and Other Liabilities Entity Address, City or Town Entity Address, City or Town Effect of exchange rate changes on foreign currency cash Effect of Exchange Rate on Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Deferred tax assets, net Deferred Tax Assets, Net of Valuation Allowance Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount RSUs Restricted Stock Units (RSUs) [Member] Prior notice to be given before redemption date Debt Instrument, Prior Notice, Redemption Period, Start Date Debt Instrument, Prior Notice, Redemption Period, Start Date Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Total consideration effectively transferred Total consideration effectively transferred Business Combination, Consideration Transferred Statutory Accounting Practices [Line Items] Statutory Accounting Practices [Line Items] Entity Emerging Growth Company Entity Emerging Growth Company Year 3 Short-Duration Insurance Contracts, Historical Claims Duration, Year Three Changes in assets – (increase) decrease: Increase (Decrease) in Operating Assets [Abstract] Outstanding, ending balance (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number Commission rate, adjustment criteria, loss ratio floor Related Party Transaction, Commission Rate, Adjustment Criteria, Loss Ratio Floor Related Party Transaction, Commission Rate, Adjustment Criteria, Loss Ratio Floor Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year [Member] Accrued interest on collateral held by related party Related Party Transaction, Accrued Interest on Collateral Held by Related Party Related Party Transaction, Accrued Interest on Collateral Held by Related Party Less: unamortized fair value adjustment Debt Issuance Costs, Net 2014 Short-Duration Insurance Contracts, Accident Year 2014 [Member] Restricted cash and cash equivalents Restricted cash and cash equivalents, end of year Total restricted cash Restricted Cash and Cash Equivalent 12 Months or More Fixed Maturities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss Fixed Maturities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss AUM Reinsurance Segment AUM Reinsurance Segment [Member] AUM Reinsurance Segment Underwriting loss and fee income Underwriting Income Loss Net Net premiums earned less: net losses and loss expenses, acquisition costs and general and administrative expenses directly related to underwriting activities. Common shares, outstanding (in shares) Outstanding shares, beginning balance (in shares) Outstanding shares, ending balance (in shares) Common Stock, Shares, Outstanding Insurance [Abstract] Insurance [Abstract] Reinsurance, amount retained, per policy Reinsurance, Amount Retained, Per Policy Schedule of Changes in Common Shares Outstanding Schedule of Common Stock Outstanding Roll Forward [Table Text Block] (Decrease) increase in valuation allowance Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount 2013 Short-Duration Insurance Contracts, Accident Year 2013 [Member] Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year [Member] Schedule of Estimated Aggregate Amortization Expense Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] Intangible Assets Intangible Assets, Finite-Lived, Policy [Policy Text Block] Claims Development [Line Items] Claims Development [Line Items] Number of Restricted Units Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Effective interest rate Debt Instrument, Interest Rate, Effective Percentage Entity Address, Postal Zip Code Entity Address, Postal Zip Code Restatement Determination Date Restatement Determination Date Business Combination, Pro Forma Information [Abstract] Business Combination, Pro Forma Information [Abstract] Income tax expense Income tax expense Total income tax expense Less: income tax expense Income Tax Expense (Benefit) Debt instrument, basis spread on variable rate Debt Instrument, Basis Spread on Variable Rate Basic loss from discontinued operations per share attributable to Kestrel common shareholders (in dollars per share) Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic Share Other assets Other Assets Balance - beginning of period Total Level 3 investments - end of period Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value Credit Rating [Axis] Credit Rating, Standard & Poor's [Axis] Pension Adjustments Service Cost Pension Adjustments Service Cost [Member] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] EBITDA & Commission Discount Rate Measurement Input, EBITDA and Commission Discount Rate [Member] Measurement Input, EBITDA and Commission Discount Rate Gross Property, Plant and Equipment, Gross Schedule of Fixed Maturities in an Unrealized Loss Position and Aggregate Fair Value Securities, Continuous Unrealized Loss Position, Fair Value [Table Text Block] Securities, Continuous Unrealized Loss Position, Fair Value Discontinued Operations, Held-for-sale Discontinued Operations, Held-for-Sale [Member] Subsidiary or Equity Method Investee, Sale of Stock [Table] Subsidiary or Equity Method Investee, Sale of Stock [Table] Discontinued Operations and Disposal Groups [Abstract] Discontinued Operations and Disposal Groups [Abstract] Treasury Shares Stockholders' Equity, Policy [Policy Text Block] Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Federal (Bermuda) Income Tax Paid, Federal, after Refund Received All Trading Arrangements All Trading Arrangements [Member] Equity Awards Adjustments, Footnote Equity Awards Adjustments, Footnote [Text Block] Total Shareholder Return Vs Peer Group Total Shareholder Return Vs Peer Group [Text Block] Redemption price percentage Debt Instrument, Redemption Price, Percentage Deferred tax liabilities: Deferred Tax Liabilities, Gross [Abstract] Issued and outstanding upon vesting of restricted shares (in shares) Non-vested, ending balance (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] Net present value of total distributions Equity Method Investments, Distributions, Net Present Value Equity Method Investments, Distributions, Net Present Value Asset Management Agreement Asset Management Agreement [Member] Asset Management Agreement [Member] Proceeds from insurance premiums collected Proceeds from Insurance Premiums Collected Net cash used in operating activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation Statutory Accounting Practice, Jurisdiction [Axis] Statutory Accounting Practice, Jurisdiction [Axis] AA+, AA, AA- Standard & Poor's, AA Plus, AA, AA Minus Rating [Member] Standard & Poor's, AA+, AA, AA- Rating Gross equity portion of consideration transferred at Closing Business Combination, Consideration Transferred, Equity Interest, Excluding Treasury Stock Business Combination, Consideration Transferred, Equity Interest, Excluding Treasury Stock Effective Income Tax Rate Reconciliation [Table] Effective Income Tax Rate Reconciliation [Table] Proceeds from sales of fixed maturities Proceeds from Sale of Debt Securities, Available-for-Sale Increase in allowance for expected credit losses on reinsurance recoverable where credit losses were previously recognized on acquired assets Reinsurance Recoverable, Allowance for Credit Loss, Recovery Sales Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales Other assets Business Combination, Recognized Asset Acquired, Other Asset, Current Common shares held by Maiden Reinsurance (in shares) Common Shares Held by Subsidiary in Exchange for Preference Shares Common Shares Held by Subsidiary in Exchange for Preference Shares Schedule of Equity Method Investments [Line Items] Schedule of Equity Method Investments [Line Items] Equity Valuation Assumption Difference, Footnote Equity Valuation Assumption Difference, Footnote [Text Block] PEO Total Compensation Amount PEO Total Compensation Amount Foreign Income Tax Paid, Foreign, after Refund Received [Abstract] Long-term Debt, Type [Axis] Long-Term Debt, Type [Axis] Underwriting-related derivative liability, measurement inputs Derivative Liability, Measurement Input Denominator: Weighted Average Number of Shares Outstanding, Basic [Abstract] Schedule of Investments [Abstract] Schedule of Investments [Abstract] Equity Components [Axis] Equity Components [Axis] Property, Plant and Equipment [Line Items] Property, Plant and Equipment [Line Items] Net investment income and net realized and unrealized investment gains Investment Income and Gain (Loss) on Investments, Net Investment Income and Gain (Loss) on Investments, Net Other (predominantly Europe) Other Countries [Member] Other Countries [Member] Non-Rule 10b5-1 Arrangement Adopted Non-Rule 10b5-1 Arrangement Adopted [Flag] Silverstone Venture 3 Silverstone Venture 3 [Member] Silverstone Venture 3 Number of reportable segments Number of Reportable Segments Principal repayment Loans Payable GLS to ADC GLS to ADC [Member] GLS to ADC Number of directors selected by affiliate Number of Directors, Selected by Affiliate Number of Directors, Selected by Affiliate Net loss and loss adjustment expenses Net loss and LAE Net Net loss and loss adjustment expenses Policyholder Benefits and Claims Incurred, Net Investment Ownership, At Merger Closing Investment Ownership, At Merger Closing [Member] Investment Ownership, At Merger Closing Entity Address, Country Entity Address, Country Amount of loss from discontinued operations allocated to participating common shareholders, basic Net Income (Loss) from Discontinued Operations Available to Common Shareholders, Basic Antidilutive Security, Excluded EPS Calculation [Table] Antidilutive Security, Excluded EPS Calculation [Table] Assets valued by third party, percentage Assets, Fair Value Disclosure, Valued by Third Party, Percentage Assets, Fair Value Disclosure, Valued by Third Party, Percentage Assets and liabilities associated with reinsurance business retroceded Reinsurance, Assets And Liabilities, Retroceded, Percentage Reinsurance, Assets And Liabilities, Retroceded, Percentage Individual: Individual [Axis] Defined contribution plans expense Defined Contribution Plan, Cost % of Total Equity Method Investments, Percent Of Total Equity Method Investments, Percent Of Total Income Tax Jurisdiction [Domain] Income Tax Jurisdiction [Domain] Dividends paid – Kestrel equityholders Payments of Ordinary Dividends, Common Stock Document Annual Report Document Annual Report Number of remaining retroactive reinsurance contracts Number Of Remaining Retroactive Reinsurance Agreements Number Of Remaining Retroactive Reinsurance Agreements Estimated recovery from third party Loss Contingency, Estimated Recovery from Third Party Amortized cost of securities without single maturities Debt Securities, Available-for-Sale, Maturity, without Single Maturity Date, Amortized Cost Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Noncontrolling interest, ownership percentage Subsidiary, Ownership Percentage, Noncontrolling Owner Segment Concentration Risk Segment Concentration Risk [Member] Segment Concentration Risk [Member] Entity Interactive Data Current Entity Interactive Data Current Earn Out Liability Earn Out Liability [Policy Text Block] Earn Out Liability Investment Management Fee Investment Management Fees [Member] Investment Management Fees [Member] Total exercisable, Aggregate Intrinsic Value Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Intrinsic Value Net operating losses Deferred Tax Assets, Operating Loss Carryforwards Number of votes per share Common Stock, Number Of Votes Per Share Common Stock, Number Of Votes Per Share Long-Lived Tangible Asset [Axis] Long-Lived Tangible Asset [Axis] Ownership [Domain] Ownership [Domain] Proceeds from maturities, paydowns and calls of fixed maturities Proceeds From Maturities, Prepayments And Calls Of Debt Securities, Investing Activities Proceeds From Maturities, Prepayments And Calls Of Debt Securities, Investing Activities Reserve for loss and loss adjustment expenses Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed, Reserve For Loss And Loss Adjustment Expenses Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed, Reserve For Loss And Loss Adjustment Expenses Maiden LF Maiden LF [Member] Maiden LF [Member] Change in net unrealized gains on investment Change, net of deferred income tax Other Comprehensive Income (Loss), Investments Adjustment, Net of Tax, Portion Attributable To Parent Other Comprehensive Income (Loss), Investments Adjustment, Net of Tax, Portion Attributable To Parent All outstanding liabilities prior to 2008, net of reinsurance Short-Duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net, Not Separately Presented Accrued interest Interest Payable, Current Entity Central Index Key Entity Central Index Key PEO Name PEO Name Discounted cash flows & option pricing models Valuation Technique, Discounted Cash Flow and Option Pricing Model [Member] Valuation Technique, Discounted Cash Flow and Option Pricing Model Total revenues Revenues Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year [Member] Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount Investment Ownership, 5 Percent Investment Ownership, 5 Percent [Member] Investment Ownership, 5 Percent Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Vesting on First Anniversary of Grant Date Share-Based Payment Arrangement, Tranche One [Member] Statutory Net Income (Loss) Statutory Accounting Practices, Statutory Net Income Amount Net premiums written Net premiums written Premiums Written, Net Statutory assets Assets Held by Insurance Regulators Reinsurance balances receivable, net, allowance for expected credit losses Premium Receivable, Allowance for Credit Loss Exercise Price Award Exercise Price Entity Filer Category Entity Filer Category Federal tax rate Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 2028 Finite-Lived Intangible Asset, Expected Amortization, Year Three Vesting [Domain] Vesting [Domain] Leah Karfunkel Leah Karfunkel [Member] Leah Karfunkel Cash and cash equivalents Disposal Group, Including Discontinued Operation, Cash and Cash Equivalents Deferred tax assets: Deferred Tax Assets, Net [Abstract] Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year [Member] Gross premiums written Premiums Written, Gross Entity Address, Address Line One Entity Address, Address Line One Accumulated other comprehensive income Total AOCI Attributable to Parent [Member] Accrued expenses and other liabilities Increase (Decrease) in Accrued Liabilities and Other Operating Liabilities Investments [Domain] Investments [Domain] Issuance of common shares due to the Combination (in shares) Stock Issued During Period, Shares, Conversion of Convertible Securities Reinsurance recoverable on unpaid losses (Allowance for expected credit losses: 2025 - $1,740) Reinsurance recoverable on unpaid losses Impact of LPT/ADC Reinsurance Recoverable for Unpaid Claims and Claims Adjustments Common shares issued or to be issued (in shares) Business Combination, Contingent Consideration, Shares issued or To Be Issued Business Combination, Contingent Consideration, Shares issued or To Be Issued Business Combination, Asset Acquisition, Transaction between Entities under Common Control, and Joint Venture Formation [Abstract] Ownership [Axis] Ownership [Axis] Proceeds from sale and redemption of other investments Proceeds from Sale and Maturity of Other Investments Awards replaced (in shares) Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Replaced In Period Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Replaced In Period Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] % of Total fair value Fixed Maturities, Percent of Total Fair Value Fixed Maturities, Percent of Total Fair Value Fair Value as of Grant Date Award Grant Date Fair Value Equity securities, at fair value, cost Cost Equity Securities, FV-NI, Cost Restricted Cash and Investments Items [Line Items] Restricted Cash and Investments [Line Items] Restricted Cash and Investments [Line Items] AmTrust Financial Services, Inc. AmTrust Financial Services, Inc. [Member] AmTrust Financial Services, Inc. [Member] Operating Loss carryforwards Operating Loss Carryforwards Reinsurance balances receivable, net Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Reinsurance Balances Receivable, Net Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Reinsurance Balances Receivable, Net Schedule of Issuances of Senior Notes Outstanding Schedule of Long-Term Debt Instruments [Table Text Block] Awards granted (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period Shareholder voting power, percentage Common Stock, Shareholder Voting Power, Percentage Common Stock, Shareholder Voting Power, Percentage Title and Position [Domain] Title and Position [Domain] Total unrecognized compensation cost Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount Awards forfeited (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeited in Period Related Party Transaction [Line Items] Related Party Transaction [Line Items] Expected credit losses on acquired recoverables under the Combination Increase in allowance for expected credit losses on reinsurance recoverable where credit losses were previously recognized on acquired assets Reinsurance Recoverable, Credit Loss Expense (Reversal) Schedule of Significant Unobservable Inputs for Determining Fair Value of Other Investments Fair Value Measurement Inputs and Valuation Techniques [Table Text Block] Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] 2021 Short-Duration Insurance Contract, Accident Year 2021 [Member] 2027 Lessee, Operating Lease, Liability, to be Paid, Year Two Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, Footnote [Text Block] Outstanding, Weighted Average Remaining Contractual Term Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term Accrued investment income Accrued Investment Income Receivable 2009 Short-Duration Insurance Contracts, Accident Year 2009 [Member] Investment Type [Axis] Investment Type [Axis] Total investments Investments Title Trading Arrangement, Individual Title Peer Group Total Shareholder Return Amount Peer Group Total Shareholder Return Amount US Treaty business ceded to Cavello Short-Duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] George Karfunkel, less than 5% ownership George Karfunkel [Member] George Karfunkel [Member] Amortized cost Investments, Original or Amortized Cost Basis Investments, Original or Amortized Cost Basis Schedule of Prior Year Loss Development by Line of Business Schedule of prior year loss development by line of business [Table Text Block] Schedule of prior year loss development by line of business Upfront cash Extraordinary dividend Payments to Acquire Businesses, Gross Non-PEO NEO Non-PEO NEO [Member] Outstanding, Aggregate Intrinsic Value Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Intrinsic Value Letters of credit outstanding Letters of Credit Outstanding, Amount Allowance for expected credit losses Debt Securities, Available-for-Sale, Allowance for Credit Loss Net operating loss carryforwards expire Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration Schedule of Reconciliation of Claims Development to Liability Short-Duration Insurance Contracts, Reconciliation of Claims Development to Liability [Table Text Block] Fee revenue, net Fee revenue Fee Income Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated Other Comprehensive Income (Loss) [Line Items] Gross unrealized gains Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax Identifiable Intangible Asset, Excluding Goodwill [Abstract] Business Combination, Recognized Asset Acquired, Identifiable Intangible Asset, Excluding Goodwill [Abstract] ASSETS Disposal Group, Including Discontinued Operation, Assets [Abstract] Award Type [Domain] Award Type [Domain] Award Type [Domain] 2026 Lessee, Operating Lease, Liability, to be Paid, Year One Net loan receivable from related party Payments for (Proceeds from) Loans Receivable Additional claims estimated Reinsurance Recoverables, Incurred but Not Reported Claims Equity Awards Adjustments Equity Awards Adjustments [Member] Leasehold improvements Leasehold Improvements [Member] Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block] Compensation Amount Outstanding Recovery Compensation Amount Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Schedule for Reserve for Loss and LAE and Schedule of Prior Period Development Experienced Schedule of Liability for Unpaid Claims and Claims Adjustment Expense [Table Text Block] Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Fair Value Estimate of Fair Value Measurement [Member] Market comparable companies & Option Pricing Models Valuation Technique, Price of Comparable Business [Member] Schedule of Investments [Line Items] Schedule of Investments [Line Items] MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] Amortized cost Fixed Maturities, Amortized Cost Basis Fixed Maturities, Amortized Cost Basis Due after one year through five years Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year One Through Five Foreign tax rate Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Percent AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] Equity securities, gross gains Equity Securities, FV-NI, Realized And Unrealized Gain Equity Securities, FV-NI, Realized And Unrealized Gain Senior notes - at fair value Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed, Long-Term Debt Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed, Long-Term Debt Incurred loss and LAE, net of reinsurance Short-Duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net Shares issued to Maiden Reinsurance Treasury Stock, Shares Issued to Subsidiary Treasury Stock, Shares Issued to Subsidiary Value of Business Acquired Amortization expense: VOBA Value of Business Acquired [Member] Value of Business Acquired Revenues Revenues [Abstract] Investment Milestone, Type [Axis] Investment Milestone, Type [Axis] Investment Milestone, Type Documents Incorporated by Reference Documents Incorporated by Reference [Text Block] Non-U.S. government bonds Non-U.S. government bonds Foreign Government Debt [Member] Due after five years through ten years Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 Cash and cash equivalents and investments Total restricted cash and investments Restricted Cash and Investments Schedule of Fair Value of Restricted Assets Schedule of Financial Instruments Owned and Pledged as Collateral [Table Text Block] Accrued investment income Increase (Decrease) in Accrued Investment Income Receivable Accumulated other comprehensive income Accumulated Other Comprehensive Income (Loss), Net of Tax Financial Instruments [Domain] Financial Instruments [Domain] Deferred tax liabilities Deferred Tax Liabilities, Gross Percent of ceding commission payable, period increase Related Party Transaction, Percent Of Ceding Commission Payable, Period Increase (Decrease) Related Party Transaction, Percent Of Ceding Commission Payable, Period Increase (Decrease) Fair value recurring basis unobservable input reconciliation asset gain loss statement of other comprehensive income extensible list not disclosed flag Fair Value Recurring Basis Unobservable Input Reconciliation Asset Gain Loss Statement Of Other Comprehensive Income Extensible List Not Disclosed Flag Fair Value Recurring Basis Unobservable Input Reconciliation Asset Gain Loss Statement Of Other Comprehensive Income Extensible List Not Disclosed Flag Purchases Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases Bermuda BERMUDA Aggregate Pension Adjustments Service Cost Aggregate Pension Adjustments Service Cost [Member] LIABILITIES Disposal Group, Including Discontinued Operation, Liabilities [Abstract] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Minimum Low Minimum [Member] Other assets Disposal Group, Including Discontinued Operation, Other Assets Income (loss) available to Kestrel common shareholders, continuing operations, diluted Net Income (Loss) from Continuing Operations Available to Common Shareholders, Diluted Company Selected Measure Name Company Selected Measure Name Net loss Business Combination, Pro Forma Information, Pro Forma Income (Loss), after Tax Fair Value Measurement [Domain] Fair Value Measurement [Domain] Aggregate Available Trading Arrangement, Securities Aggregate Available Amount 2018 Short-Duration Insurance Contracts, Accident Year 2018 [Member] Stock Appreciation Rights (SARs) Stock Appreciation Rights (SARs) [Member] Year 1 Short-Duration Insurance Contracts, Historical Claims Duration, Year One Extell Hudson Waterfront Holdings Extell Hudson Waterfront Holdings [Member] Extell Hudson Waterfront Holdings Net income (loss) attributable to Kestrel common shareholders, diluted Net Income (Loss) Available to Common Stockholders, Diluted Stockholders' Equity Note [Abstract] Stockholders' Equity Note [Abstract] Current tax (benefit) expense – Foreign (U.S. and others) Current Foreign Tax Expense (Benefit) Commitments, Contingencies and Guarantees Commitments and Contingencies Disclosure [Text Block] Vesting on Each Quarter Following First Anniversary Share-Based Payment Arrangement, Tranche Two [Member] Historic Reinsurance Historic Reinsurance [Member] Historic Reinsurance Weighted average number of common shares - diluted (in shares) Weighted Average Number of Shares Outstanding, Diluted Summit Financial Services, Inc. Summit Financial Services, Inc. [Member] Summit Financial Services, Inc. Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] Reconciliation of Assets from Segment to Consolidated [Table] Reconciliation of Assets from Segment to Consolidated [Table] Percentage ceded Related Party Transaction, Percent Of Ceded Business Amount Related Party Transaction, Percent Of Ceded Business Amount Entity Small Business Entity Small Business Income Tax Disclosure [Abstract] Income Tax Disclosure [Abstract] Loss contingency, loss in period Loss Contingency, Loss in Period Long-Term Debt Long-Term Debt [Text Block] Document Transition Report Document Transition Report Program Services Program Services Segment [Member] Program Services Segment Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Due after one year through five years Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five Underlying Securities Award Underlying Securities Amount Fixed maturities, gross gains Debt Securities, Available-for-Sale, Realized Gain Equity Component [Domain] Equity Component [Domain] Document Period End Date Document Period End Date Total Fixed Maturities, Continuous Unrealized Loss Position, Fair Value Fixed Maturities, Continuous Unrealized Loss Position, Fair Value EBITDA & Commission Equity Volatility Rate Measurement Input, EBITDA and Commission Volatility Rate [Member] Measurement Input, EBITDA and Commission Volatility Rate Private credit funds Private Credit Lending [Member] Private Credit Lending Income Taxes Income Tax Disclosure [Text Block] Awards Close in Time to MNPI Disclosures, Table Awards Close in Time to MNPI Disclosures [Table Text Block] Privately held preferred stocks Private equity investments - 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preferred shares 3 Privately Held Equity Investments in Preferred Stock 3 [Member] Privately Held Equity Investments in Preferred Stock 3 Add: Net loss from discontinued operations Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest Auditor Location Auditor Location Legacy Reinsurance Legacy Reinsurance Segment [Member] Legacy Reinsurance Segment Maximum limit of liability attaching (in EUR) Related Party Transaction, Maximum Limit of Liability Attaching Related Party Transaction, Maximum Limit of Liability Attaching Reinsurer, Name [Axis] Reinsurer, Name [Axis] Schedule of Incurred Losses And LAE And Cumulative Paid Losses And LAE Short-Duration Insurance Contracts, Claims Development [Table Text Block] Number of short duration insurance contracts Short Duration Insurance Contracts, Number Of Major Contracts Short Duration Insurance Contracts, Number Of Major Contracts Less: reinsurance recoverable on unpaid losses, January 1 Reinsurance recoverable on unpaid losses, December 31 Reinsurance Recoverables, Including Reinsurance Premium Paid Gain (Loss) on Securities [Line Items] Gain (Loss) on Securities [Line Items] Accrued expenses and other liabilities Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Accrued Expenses and Other Liabilities Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Accrued Expenses and Other Liabilities Total income taxes paid Income Taxes Paid, Net Corporate bonds Corporate Bond Securities [Member] 2027 Finite-Lived Intangible Asset, Expected Amortization, Year Two All other lines Insurance, Other [Member] Senior notes - principal amount Principal amount Long-Term Debt, Gross Entity Well-known Seasoned Issuer Entity Well-known Seasoned Issuer 2024 Short-Duration Insurance Contract, Accident Year 2024 [Member] General Liability Property, Liability and Casualty Insurance Product Line [Member] Stock owned by shareholder (in shares) Investment Owned, Balance, Shares Expiration Date Trading Arrangement Expiration Date Restricted Cash and Investments, Type [Axis] Restricted Cash and Investments, Type [Axis] Restricted Cash and Investments, Type [Axis] 2030 Finite-Lived Intangible Asset, Expected Amortization, Year Five Related party transaction amount (returned) Related Party Transaction, Amounts of Transaction Real estate investments at fair value option elected Real Estate Investments At Fair Value [Member] Real Estate Investments At Fair Value EQUITY Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] Net unrealized gains recognized for equity securities held at reporting date Equity Securities, FV-NI, Unrealized Gain (Loss) Fixed maturities Fixed Income Securities [Member] A+, A, A- Standard & Poor's SingleA Plus, SingleA, and SingleA Minus [Member] Standard & Poor's, A-Plus, A, A- Rating [Member] Other equity method investments at fair value option elected Other Investments Total unfunded commitments on other investments Other Investments [Member] Net carrying value Net carrying value Property, Plant and Equipment, Net Schedule of Equity Method Investments and Carrying Value and Beneficial Ownership Percentage of Equity Method Investments Equity Method Investments [Table Text Block] Ceded Ceded Premiums Written Compensation Actually Paid vs. Net Income Compensation Actually Paid vs. Net Income [Text Block] Entity Current Reporting Status Entity Current Reporting Status GLS GLS Insurance [Member] GLS Insurance Private equity investments - preferred shares 2 Privately Held Equity Investments in Preferred Stock 2 [Member] Privately Held Equity Investments in Preferred Stock 2 Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Consolidated Entities [Domain] Consolidated Entities [Domain] Premiums and losses related to policies, percentage Related Party Transaction, Premiums and Losses Related to Policies Related Party Transaction, Premiums and Losses Related to Policies Due in one year or less Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, Year One Reinsurance recoverables on paid losses, gross Reinsurance Recoverables on Paid Losses, Gross U.S. taxes at statutory rates - Federal Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount Equity portion of consideration transferred to Maiden Reinsurance Business Combination, Consideration Transferred, Equity Interest in Treasury Stock Business Combination, Consideration Transferred, Equity Interest in Treasury Stock Financial Instrument [Axis] Financial Instrument [Axis] Financial Instrument [Axis] Expenses Benefits, Losses and Expenses [Abstract] Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Executive Category: Executive Category [Axis] Seiden LP & Seiden MGMT LP Seiden LP & Seiden MGMT LP [Member] Seiden LP & Seiden MGMT LP Current Fiscal Year End Date Current Fiscal Year End Date Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Collaborative arrangement, reserves expected to be commuted Collaborative Arrangement, Reserves Expected to be Commuted Collaborative Arrangement, Reserves Expected to be Commuted Weighted Average Grant-Date Fair Value Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] Net paid losses related to Prior years Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Prior Years Common shares remain for future issuance (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant Underwriting-related derivative liability Derivative Liability Other investments, net Gain (Loss) on Other Securities, Excluding Debt and Equity Securities Gain (Loss) on Other Securities, Excluding Debt and Equity Securities Equity Awards Adjustments, Excluding Value Reported in Compensation Table Equity Awards Adjustments, Excluding Value Reported in the Compensation Table [Member] Number of reinsurance agreements, completing run-off Reinsurance Agreement, Completing Run-Off Reinsurance Agreement, Completing Run-Off Schedule of Financial Instruments Measured at Fair Value on a Recurring Basis Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Equity securities, at fair value (Cost: 2025 - $11,145) Fair Value Equity securities Equity Securities, FV-NI, Current Shares issued on Combination Agreement Stock Issued During Period, Value, Acquisitions Net assets Net assets Business Combination, Recognized Asset Acquired to Liability Assumed, Excess (Less) Unrecognized tax benefits Unrecognized Tax Benefits Other run-off lines Other Run-off Lines Insurance [Member] Other Run-off Lines Insurance Discretionary Performance-Based Restricted Shares Discretionary Performance-Based Restricted Shares [Member] Discretionary Performance-Based Restricted Shares 2025 Short-Duration Insurance Contract, Accident Year 2025 [Member] Year 4 Short-Duration Insurance Contracts, Historical Claims Duration, Year Four Net unrealized gains on investments Deferred Tax Assets, Investments Net cash used in financing activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Kestrel Group, Ltd. Kestrel Group, Ltd. [Member] Kestrel Group, Ltd. Measure: Measure [Axis] Valuation Approach and Technique [Axis] Valuation Approach and Technique [Axis] % of Total Net premiums earned Premiums Earned, Net as a Percent of Total Premiums Earned, Net as a Percent of Total Number of directors Number of Directors Number of Directors Barry Zyskind Barry Zyskind [Member] Barry Zyskind Long-Lived Tangible Asset [Domain] Long-Lived Tangible Asset [Domain] 2016 Senior Notes - MHLA – 6.625% 2016 Senior Notes Senior Notes 2016 [Member] Senior Notes 2016 [Member] Private equity investments - preferred shares 4 Privately Held Equity Investments in Preferred Stock 4 [Member] Privately Held Equity Investments in Preferred Stock 4 Disposal Group Classification [Domain] Disposal Group Classification [Domain] Statutory Capital and Surplus Statutory capital and surplus Statutory Accounting Practices, Statutory Capital and Surplus, Balance Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Forgone Recovery due to Violation of Home Country Law, Amount Forgone Recovery due to Violation of Home Country Law, Amount Amortization expense, debt issuance costs Amortization of Debt Issuance Costs Investment expenses Investment Income, Investment Expense Entity Tax Identification Number Entity Tax Identification Number Discounted cash flows Valuation Technique, Discounted Cash Flow [Member] Fair value of securities without single maturities Debt Securities, Available-for-Sale, Maturity, without Single Maturity Date, Fair Value Post-Termination Endorsement No. 2 Post-Termination Endorsement No. 2 [Member] Post-Termination Endorsement No. 2 [Member] Year 10 Short-Duration Insurance Contracts, Historical Claims Duration, Year 10 Outstanding, ending balance (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price Percentage of outstanding debt holders in lawsuit (at least) Loss Contingency, Percentage of Outstanding Debt Holders Involved in Lawsuit Loss Contingency, Percentage of Outstanding Debt Holders Involved in Lawsuit Common shares, issued (in shares) Common Stock, Shares, Issued Employee Employee [Member] Employee Operating lease, weighted average remaining lease term Operating Lease, Weighted Average Remaining Lease Term Privately held equity investments Other Privately Held Investments [Member] Other Privately Held Investments Reconciliation to net income Reconciliation to Net Income (Loss) [Abstract] Reconciliation to Net Income (Loss) [Abstract] Post-Termination Endorsement, Minimum Excess Funding Requirement Post-Termination Endorsement, Minimum Excess Funding Requirement [Member] Post-Termination Endorsement, Minimum Excess Funding Requirement [Member] U.S. agency bonds – mortgage-backed Mortgage-Backed Security, Issued by US Government-Sponsored Enterprise [Member] Entity Public Float Entity Public Float Trading Arrangement: Trading Arrangement [Axis] Total Shareholder Return Amount Total Shareholder Return Amount Loss Contingencies [Line Items] Loss Contingencies [Line Items] Corporate assets Segment Reporting, Reconciling Item, Corporate Nonsegment [Member] Security Exchange Name Security Exchange Name Total Foreign Income Tax Paid, Foreign, after Refund Received Reinsurance recoverable, allowance for credit loss Allowance for expected credit losses on reinsurance recoverable, beginning of period Allowance for expected credit losses on reinsurance recoverable, end of period Reinsurance Recoverable, Allowance for Credit Loss Collateral by third party Reinsurance, Collateral By Third Party Reinsurance, Collateral By Third Party Post-Termination Endorsement No. 1 Post-Termination Endorsement No. 1 [Member] Post-Termination Endorsement No. 1 [Member] 2023 Short-Duration Insurance Contract, Accident Year 2023 [Member] Ceded Ceded Premiums Earned Investments Investment Holdings [Text Block] Reinsurance Disclosures [Abstract] Reinsurance Disclosures [Abstract] 2022 Short-Duration Insurance Contract, Accident Year 2022 [Member] Unrealized losses of unrealized loss positions Investments, Continuous Unrealized Loss Position, Accumulated Loss Investments, Continuous Unrealized Loss Position, Accumulated Loss Statement [Line Items] Statement [Line Items] Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Cash and cash equivalents Cash and cash equivalents, end of year Cash and Cash Equivalent Common shares Privately held common stocks Common Stock [Member] Awards vested (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period Statutory Requirements and Dividend Restrictions Statutory Requirements [Text Block] Disclosure of statutory requirements of certain operating subsidiaries, including, but not limited to capital and solvency metrics and restrictions on dividend and capital movements. Net increase (decrease) in cash, restricted cash and cash equivalents Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation Potentially dilutive securities (in shares) Weighted Average Number of Shares Outstanding, Diluted, Adjustment Premiums and Related Expenses Revenue Recognition, Premiums Earned, Policy [Policy Text Block] Significant Accounting Policies Significant Accounting Policies [Text Block] Statistical Measurement [Domain] Statistical Measurement [Domain] 2016 Short-Duration Insurance Contracts, Accident Year 2016 [Member] Thereafter Lessee, Operating Lease, Liability, to be Paid, after Year Five Commission rate, percent of ceded written premiums Related Party Transaction, Commission Rate, Percent of Ceded Written Premiums Related Party Transaction, Commission Rate, Percent of Ceded Written Premiums Allowance for expected credit losses, receivables Debt Securities, Available-for-Sale, Allowance for Credit Loss, Writeoff Loss contingency, coverage with aggregate limits Loss Contingency, Aggregate Coverage Amount Loss Contingency, Aggregate Coverage Amount Net incurred losses related to Prior year Prior Year Claims and Claims Adjustment Expense Options replaced (in dollars per share) Share-Based Compensation Arrangement By Share-Based Payment Award, Options, Replaced In Period, Weighted Average Exercise Price Share-Based Compensation Arrangement By Share-Based Payment Award, Options, Replaced In Period, Weighted Average Exercise Price Related Party Transaction [Axis] Related Party Transaction [Axis] Intercompany settlement Business Combination, Consideration Transferred, Intercompany Settlement Business Combination, Consideration Transferred, Intercompany Settlement Collaborative arrangement, reserves expected to be commuted, exit cost Collaborative Arrangement, Reserves Expected to be Commuted, Exit Cost Collaborative Arrangement, Reserves Expected to be Commuted, Exit Cost Valuation Approach and Technique [Domain] Valuation Approach and Technique [Domain] Net realized and unrealized gains recognized in the statement of income Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) % of Total Other Investments, Percent of Total Other Investments, Percent of Total Interest in income of equity method investments Interest in income of equity method investments Interest in income from equity method investments Income (Loss) from Equity Method Investments European Hospital Liability European Hospital Insurance Product Line [Member] European Hospital Insurance Product Line [Member] Unearned premiums (includes $17,227 from related parties in 2025) Unearned premiums Unearned Premiums Intangible Asset, Acquired, Finite-Lived [Line Items] Intangible Asset, Acquired, Finite-Lived [Line Items] Common shares (in shares) Kestrel Group Ltd shares issued at Closing (in shares) Business Combination, Consideration Transferred, Equity Interest, Share Issued, Number of Shares Gain Contingencies [Line Items] Gain Contingencies [Line Items] Schedule of Assets and Liabilities Classified as Held for Sale Disposal Groups, Including Discontinued Operations [Table Text Block] Other investments Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed, Other Investments Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed, Other Investments Sweden SWEDEN Gross unrealized losses Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax Share-based Payment Arrangement, Noncash Expense [Abstract] Share-Based Payment Arrangement, Noncash Expense [Abstract] Trading Arrangements, by Individual Trading Arrangements, by Individual [Table] Total IBNR Short-Duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net Basic earnings (loss) per share available to Kestrel common shareholders (in dollars per share) Earnings Per Share, Basic Typical insurance limit Short Duration Insurance Contract, Policy Limit Short Duration Insurance Contract, Policy Limit Reinsurance Recoverable, Allowance for Credit Loss [Roll Forward] Reinsurance Recoverable, Allowance for Credit Loss [Roll Forward] Deferred tax assets before valuation allowance Deferred Tax Assets, Gross Discount rate Measurement Input, Discount Rate [Member] Diversified Reinsurance Net adverse PPD for Diversified Reinsurance legacy business Diversified Reinsurance Diversified Reinsurance Segment [Member] Diversified Reinsurance Segment [Member] GLS to RPP GLS to RPP [Member] GLS to RPP Schedule of Reconciliation of Reportable Segments Underwriting Results to Consolidated Net Income Schedule of Segment Reporting Information, by Segment [Table Text Block] Diluted loss from discontinued operations per share attributable to Kestrel common shareholders (in dollars per share) Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Diluted Share Value Change - Company Performance Measurement Input, Change in Guideline Public Company Multiples [Member] Measurement Input, Change in Guideline Public Company Multiples Measurement Input Type [Domain] Measurement Input Type [Domain] Affiliated Entity Affiliated Entity [Member] Discount for Lack of Marketability Measurement Input, Discount for Lack of Marketability [Member] Net Maiden Legacy run-off business acquired Liability for Unpaid Claims and Claims Adjustment Expense, Assumed Business Liability for Unpaid Claims and Claims Adjustment Expense, Assumed Business Award Timing MNPI Disclosure Award Timing MNPI Disclosure [Text Block] AmTrust North America Inc AmTrust North America Inc [Member] AmTrust North America Inc Other general and administrative expenses Other General and Administrative Expense Schedule of the Credit Ratings of Fixed Maturities Schedule of Investment Credit Ratings [Table Text Block] Schedule of Investment Credit Ratings [Table Text Block] Lease payments to escalating fee, percentage Operating Lease, Escalating Fee Percentage Operating Lease, Escalating Fee Percentage Adverse development cover Reinsurance Recoverable For Paid And Unpaid Claims And Claims Adjustments, Adverse Development Cover Reinsurance Recoverable For Paid And Unpaid Claims And Claims Adjustments, Adverse Development Cover Purchases of equity method investments Payments to Acquire Equity Method Investments Other comprehensive income before reclassifications OCI, before Reclassifications, Net of Tax, Attributable to Parent Share-based expense Share-Based Payment Arrangement, Expense 2020 Short-Duration Insurance Contract, Accident Year 2020 [Member] Segment Reporting, Asset Reconciling Item [Line Items] Segment Reporting, Asset Reconciling Item [Line Items] Fair value Fixed Maturities, Continuous Unrealized Loss Position, Fair Value [Abstract] Fixed Maturities, Continuous Unrealized Loss Position, Fair Value [Abstract] Maiden Reinsurance Maiden Reinsurance [Member] Maiden Reinsurance 2011 Short-Duration Insurance Contracts, Accident Year 2011 [Member] Total liabilities and equity Liabilities and Equity Foreign Currency Transactions Foreign Currency Transactions and Translations Policy [Policy Text Block] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Number of Share Options Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding [Roll Forward] Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Axis] Cash, cash equivalents and restricted cash, end of year Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Including Discontinued Operation Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] Amounts reclassified from AOCI to net income, net of tax Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent Others Deferred Tax Assets, Other Equity Method Investment [Table] Equity Method Investment [Table] Total Fixed Maturities, Continuous Unrealized Loss Position, Accumulated Loss Fixed Maturities, Continuous Unrealized Loss Position, Accumulated Loss Accounting Policies [Abstract] Accounting Policies [Abstract] Scheduled of Maturity of Operating Lease Liabilities Lessee, Operating Lease, Liability, to be Paid, Maturity [Table Text Block] Concentration Risk Type [Domain] Concentration Risk Type [Domain] Purchases of other investments Payments to Acquire Other Investments Net income (loss) Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest Treasury shares Treasury Stock, Common [Member] Fair value of units vested Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value Pay vs Performance Disclosure [Line Items] Operating lease, liability Total discounted operating lease liabilities Operating Lease, Liability U.S. agency bonds US Government Agencies Debt Securities [Member] Awards replaced (in dollars per share) Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Replaced In Period, Weighted Average Grant Date Fair Value Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Replaced In Period, Weighted Average Grant Date Fair Value Unearned premiums Increase (Decrease) in Unearned Premiums Foreign currency translation adjustment Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent Percent basis currency equivalent of maximum limit of liability attaching Related Party Transaction, Percent Basis Currency Equivalent of Maximum Limit of Liability Attaching Related Party Transaction, Percent Basis Currency Equivalent of Maximum Limit of Liability Attaching Post-Termination Endorsement, Maximum Loss Corridor Post-Termination Endorsement, Maximum Loss Corridor [Member] Post-Termination Endorsement, Maximum Loss Corridor [Member] LIABILITIES Liabilities [Abstract] Business Combination Business Combination [Text Block] Total Senior Notes Financial Liabilities Fair Value Disclosure Related Party Transaction, By Type [Axis] Related Party Transaction, By Type [Axis] Related Party Transaction, By Type Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Short-duration Insurance Contracts, Historical Claims Duration [Line Items] Short-Duration Insurance Contracts, Historical Claims Duration [Line Items] Year 8 Short-Duration Insurance Contracts, Historical Claims Duration, Year Eight Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Company Selected Measure Amount Company Selected Measure Amount 2028 Lessee, Operating Lease, Liability, to be Paid, Year Three Number of subsidiaries, domiciled insurance Number of Subsidiaries, Domiciled Insurance Number of Subsidiaries, Domiciled Insurance 2013 Senior Notes - MHNC – 7.75% 2013 Senior Notes Senior Notes 2013 [Member] Senior Notes 2013 [Member] Original fair value adjustment at acquisition date Debt Issuance Costs, Gross Comprehensive income (loss) Comprehensive Income (Loss), Net of Tax, Attributable to Parent Measurement Input Type [Axis] Measurement Input Type [Axis] Name Measure Name Due in one year or less Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, Year One Other comprehensive gain, before tax Other Comprehensive Income (Loss), before 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