Accumulated Amortization Finite-Lived Intangible Assets, Accumulated Amortization Debt and Equity Securities, FV-NI [Line Items] Debt and Equity Securities, FV-NI [Line Items] Schedule of Prior Year Loss Development for the AmTrust Reinsurance Legacy Operations Schedule of prior year loss development by line of business [Table Text Block] Schedule of prior year loss development by line of business Award Timing Predetermined Award Timing Predetermined [Flag] Entity File Number Entity File 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 Additional paid-in capital Additional Paid-in Capital [Member] Quarterly brokerage fee, above portfolio threshold, percent of average holdings Related Party Transaction, Quarterly Brokerage Fee, Above Portfolio Threshold, Percent of Average Holdings Related Party Transaction, Quarterly Brokerage Fee, Above Portfolio Threshold, Percent of Average Holdings 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] Schedule of Quota Share Arrangements with AmTrust Schedule of Related Party Transactions [Table Text Block] Diversified Legacy Reinsurance Diversified Legacy Segment [Member] Diversified Legacy Segment 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] Percent of premiums written, net of cost of unaffiliated inuring reinsurance from related party Related Party Transaction, Percent of Premium Written, Net of Cost of Unaffiliated Inuring Reinsurance From Related Party Related Party Transaction, Percent of Premium Written, Net of Cost of Unaffiliated Inuring Reinsurance From Related Party Amortized cost Fixed Maturities, Amortized Cost Basis Fixed Maturities, Amortized Cost Basis Schedule of Stock by Class [Table] Stock, Class of Stock [Table] Percent of ceded underwriting risk in exchange for ceding fee Related Party Transaction, Percent of Ceded Underwriting Risk in Exchange for Ceding Fee Related Party Transaction, Percent of Ceded Underwriting Risk in Exchange for Ceding Fee AmTrust Quota Share AmTrust Quota Share [Member] AmTrust Quota Share Related party transaction, loan agreement, obligation threshold Related Party Transaction, Loan Agreement, Obligation Threshold Related Party Transaction, Loan Agreement, Obligation Threshold Assets held for sale 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 Share-based compensation expense Share-Based Payment Arrangement, Noncash Expense Stock Options Share-Based Payment Arrangement, Option [Member] Schedule of Amortized Cost, Gross Unrealized Gains and Losses and Fair Value on Fixed Maturities Schedule of Investments Reconciliation [Table Text Block] Schedule of Investments Reconciliation [Table Text Block] Total shareholders’ equity Beginning balance Ending balance Equity, Attributable to Parent Accrued investment income Disposal Group, Including Discontinued Operation, Accrued Investment Income Disposal Group, Including Discontinued Operation, Accrued Investment Income Schedule of Available-for-sale Securities [Table] Debt Securities, Available-for-Sale [Table] Insider Trading Policies and Procedures [Line Items] Authorized share capital (in shares) Common Stock, Shares Authorized Common Stock Held Directly Common Stock Ownership, Held Directly [Member] Common Stock Ownership, Held Directly Gain Contingencies [Table] Gain Contingencies [Table] Funds withheld receivable: (Allowance for expected credit losses: 2026: $2; 2025: $2) Funds withheld receivable Funds Held under Reinsurance Agreements, Asset Reinsurance balances receivable, net (includes $0 and $2 from related parties in 2026 and 2025, respectively. Allowance for expected credit losses: 2026 - $14; 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] Maximum High Maximum [Member] Discount for present value Lessee, Operating Lease, Liability, Fair Value Discount Lessee, Operating Lease, Liability, Fair Value Discount Loss and LAE Policyholder Benefits and Claims Incurred, Net [Abstract] Restricted Stock Restricted Stock [Member] Value Change - Company Performance Measurement Input, Change in Guideline Public Company Multiples [Member] Measurement Input, Change in Guideline Public Company Multiples Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount Debt Instrument [Line Items] Debt Instrument [Line Items] Terry Lee Ledbetter Terry Lee Ledbetter [Member] Terry Lee Ledbetter Cancellation notice period Related Party Transaction, Cancellation Notice Period Related Party Transaction, Cancellation Notice Period Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] Direct Direct Premiums Earned External Credit Rating, Standard & Poor's [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 Bargain purchase gain Business Combination, Bargain Purchase, Gain Recognized, Amount Non-Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated [Flag] Segment Concentration Risk Segment Concentration Risk [Member] Segment Concentration Risk [Member] Entity Shell Company Entity Shell Company Schedule of Long-term Debt Instruments [Table] Schedule of Long-Term Debt Instruments [Table] Kestrel Group Kestrel Group [Member] Kestrel Group Schedule of Composition of Other Investments Summary of Other Investments [Table Text Block] Summary of Other Investments [Table Text Block] 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] Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Net loss from continuing operations Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent Business combination, stock conversion ratio Business Combination, Stock Conversion Ratio Business Combination, Stock Conversion Ratio 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) Expenses from related party transactions Management Fee Expense 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, net Intangible Assets, Net (Including Goodwill) Accrued investment income Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Accrued investment income Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Accrued Investment Income Award Timing Method Award Timing Method [Text Block] Litigation Case [Domain] Litigation Case [Domain] Basic loss from continuing operations per share attributable to Kestrel common shareholders (in dollars per share) Basic loss from continuing operations per share attributable to Kestrel shareholders (in dollars per share) Income (Loss) from Continuing Operations, Per Basic Share AmTrust Financial Services, Inc. AmTrust Financial Services, Inc. AmTrust Financial Services, Inc. [Member] AmTrust Financial Services, Inc. [Member] Award Type Award Type [Axis] Foreign currency translation Accumulated Foreign Currency Adjustment Attributable to Parent [Member] Silverstone Venture 2 Silverstone Venture 2 [Member] Silverstone Venture 2 Investment, Name [Domain] Investment, Name [Domain] Trading Symbol Trading Symbol 2030 Lessee, Operating Lease, Liability, to be Paid, Year Four Common Stock Held Indirectly Common Stock Ownership, Held Indirectly [Member] Common Stock Ownership, Held Indirectly Accounting Treatment for the Combination Business Combination [Policy Text Block] Number of securities in an unrealized loss position Fixed Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions Fixed Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions Operating Loss Carryforwards [Table] Operating Loss Carryforwards [Table] Gross loss and LAE Policyholder Benefits and Claims Incurred, Direct EBITDA & Commission Equity Volatility Rate Measurement Input, EBITDA and Commission Volatility Rate [Member] Measurement Input, EBITDA and Commission Volatility Rate Accrued expenses and other liabilities (includes $27,468 and $16,443 from related parties in 2026 and 2025, respectively) Accrued expenses and other liabilities Accrued Liabilities and Other Liabilities Fair value of unrealized loss positions Investments, Continuous Unrealized Loss Position, Fair Value Investments, Continuous Unrealized Loss Position, Fair Value Entity Address, City or Town Entity Address, City or Town Effect of exchange rate changes on foreign currency cash, restricted cash and cash equivalents Effect of Exchange Rate on Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount Statement of Income Location, Balance [Domain] Statement of Income Location, Balance [Domain] 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 Entity Emerging Growth Company Entity Emerging Growth Company Changes in assets – (increase) decrease: Increase (Decrease) in Operating Assets [Abstract] 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] Less: unamortized fair value adjustment Debt Issuance Costs, Net Restricted cash and cash equivalents Restricted cash and cash equivalents, end of period Total restricted cash Restricted Cash and Cash Equivalent Diversified Legacy Reinsurance Diversified Reinsurance legacy business Diversified Reinsurance Segment [Member] Diversified Reinsurance Segment [Member] Common shares, outstanding (in shares) Common Stock, Shares, Outstanding Insurance [Abstract] Insurance [Abstract] Reinsurance, amount retained, per policy Reinsurance, Amount Retained, Per Policy GLS to RPP GLS to RPP [Member] GLS to RPP Investments transferred out related to Partial Termination Amendment and Commutation AmTrust Quota Shares Reinsurance Agreement, Partial Termination Amendment [Member] AmTrust Quota Shares Reinsurance Agreement, Partial Termination Amendment [Member] Issuance of common shares from vesting of stock based compensation Stock Issued During Period, Value, Stock Options Exercised 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] Fixed maturities, available-for-sale, at fair value Disposal Group Including Discontinued Operation, Debt Securities Disposal Group Including Discontinued Operation, Debt Securities 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 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 Less: income tax expense Income tax expense Income tax expense Income Tax Expense (Benefit) Fed funds rate Debt Instrument, Basis Spread on Variable Rate Basic loss from discontinued operations per share attributable to Kestrel common shareholders (in dollars per share) Basic loss from discontinued operations per share attributable to Kestrel 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, Standard & Poor's [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] Discontinued Operations, Held-for-sale Discontinued Operations, Held-for-Sale [Member] Discontinued Operations and Disposal Groups [Abstract] Discontinued Operations and Disposal Groups [Abstract] Investment Management Fee Investment Management Fees [Member] Investment Management Fees [Member] Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Solvency ratio Related Party Transaction, Solvency Ratio Related Party Transaction, Solvency Ratio 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 Collateral held by related party Related Party Transaction, Collateral Held by Related Party Related Party Transaction, Collateral Held by Related Party Number of directors, selected by affiliate Number of Directors, Selected by Affiliate Number of Directors, Selected by Affiliate 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 Collateral on exposure Related Party Transaction, Percentage Of Collateral On Exposure Related Party Transaction, Percentage Of Collateral On Exposure Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] Estimated recovery amount, maximum Gain Contingency, Estimated Recovery from Third Party, Amount Gain Contingency, Estimated Recovery from Third Party, Amount 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 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 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 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 Long-term Debt, Type [Axis] Long-Term Debt, Type [Axis] Underwriting-related derivative liability, measurement inputs Derivative Liability, Measurement Input Loss contingency, aggregate coverage amount Loss Contingency, Aggregate Coverage Amount Loss Contingency, Aggregate Coverage Amount 2026 Finite-Lived Intangible Asset, Expected Amortization, Remainder of Fiscal Year Denominator: Weighted Average Number of Shares Outstanding, Basic [Abstract] Schedule of Investments [Abstract] Schedule of Investments [Abstract] Equity Components [Axis] Equity Components [Axis] Net unrealized losses on held for sale AFS fixed maturities OCI, Debt Securities, Held-for-Sale, Unrealized Holding Gain (Loss), before Adjustment and Tax OCI, Debt Securities, Held-for-Sale, Unrealized Holding Gain (Loss), before Adjustment and Tax Non-Rule 10b5-1 Arrangement Adopted Non-Rule 10b5-1 Arrangement Adopted [Flag] Number of reporting segments Number of Reportable Segments Reinsurance principal amount Loans Payable Net loss and loss adjustment expenses Net loss and LAE Net Net loss and LAE Policyholder Benefits and Claims Incurred, Net Entity Address, Country Entity Address, Country Antidilutive Security, Excluded EPS Calculation [Table] Antidilutive Security, Excluded EPS Calculation [Table] Individual: Individual [Axis] Private equity investments - preferred shares 1 Privately Held Equity Investments in Preferred Stock 1 [Member] Privately Held Equity Investments in Preferred Stock 1 Reinsurance Retention Policy [Table] Reinsurance Retention [Table] Income Tax Authority [Domain] Income Tax Jurisdiction [Domain] Equity method investments Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed, Equity Method Investments Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed, Equity Method Investments Acquisition option term Business Combination, Acquisition Option Term Business Combination, Acquisition Option Term Other investments Other Investment [Member] Other Investment 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] Minority interest Subsidiary, Ownership Percentage, Noncontrolling Owner Entity Interactive Data Current Entity Interactive Data Current Other investments Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed, Other Investments Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed, Other Investments Net loan receivable from related party Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Net Loan Receivable From Related Party Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Net Loan Receivable From Related Party Fixed maturities, available-for-sale, at fair value Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed, Fixed Maturities, Available For Sale Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed, Fixed Maturities, Available For Sale Related Party Transaction, By Type [Axis] Related Party Transaction, By Type [Axis] Related Party Transaction, By Type [Axis] Ownership [Domain] Ownership [Domain] Portion of the Maiden awards attributable to pre-combination service Business Combination Consideration Transferred Attributable to Pre Combination Service Business Combination Consideration Transferred Attributable to Pre Combination Service Accrued interest Interest Payable, Current Entity Central Index Key Entity Central Index Key PEO Name PEO Name 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 Net realized and unrealized gains (losses) on investment, gross gains Realized And Unrealized Gain On Investments Realized And Unrealized Gain On Investments Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Quota Share Reinsurance Agreements Quota Share Reinsurance Agreements [Member] Quota Share Reinsurance Agreements [Member] Net premiums written Net premiums written Net premiums written Net Premiums Written, Net 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 Less: change in cash and cash equivalents held for sale Increase (Decrease) in Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Held-for-Sale Increase (Decrease) in Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Held-for-Sale Investments in direct lending entities Direct Lending Entities [Member] Direct Lending Entities 2029 Finite-Lived Intangible Asset, Expected Amortization, Year Three Cash and cash equivalents Disposal Group, Including Discontinued Operation, Cash and Cash Equivalents 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 Gross premiums written Premiums Written, Gross Entity Address, Address Line One Entity Address, Address Line One Net unrealized losses on held for sale AFS investments Equity Method Investment, Unrealized Gain (Loss) Equity Method Investment, Unrealized Gain (Loss) 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] Reinsurance recoverable on unpaid losses: (Allowance for expected credit losses: 2026: $1,930; 2025: $1,740) Reinsurance recoverable on unpaid losses Reinsurance Recoverable for Unpaid Claims and Claims Adjustments Business Combination, Asset Acquisition, Transaction between Entities under Common Control, and Joint Venture Formation [Abstract] 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 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] Cavello Cavello [Member] Cavello Fair Value as of Grant Date Award Grant Date Fair Value Equity securities, at fair value, cost Cost Equity Securities, FV-NI, Cost 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 Operating loss carryforwards Operating Loss Carryforwards Schedule of Issuances of Senior Notes Outstanding Schedule of Long-Term Debt Instruments [Table Text Block] Share-based compensation arrangement by share-based payment award, equity instruments other than options, grants in period (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period Increase in allowance for expected credit losses on reinsurance recoverable where credit losses were previously recognized Reinsurance Recoverable, Credit Loss Expense (Reversal) Related Party Transaction [Line Items] Related Party Transaction [Line Items] Document Quarterly Report Document Quarterly Report Silverstone Venture 1 Silverstone Venture 1 [Member] Silverstone Venture 1 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] Counterparty Name [Domain] Counterparty Name [Domain] 2028 Lessee, Operating Lease, Liability, to be Paid, Year Two Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, Footnote [Text Block] Accrued investment income Accrued Investment Income Receivable Net operating loss carryforwards, with no expiry date, percentage Deferred Tax Assets, Operating Loss Carryforwards, Not Subject to Expiration, Percentage Deferred Tax Assets, Operating Loss Carryforwards, Not Subject to Expiration, Percentage 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 Effect of foreign exchange rate movements Liability for Unpaid Claims and Claims Adjustment Expense, Foreign Currency Transaction and Translation Adjustment Increase (decrease) in liability for unpaid claims and claims adjustment expense due to foreign currency transaction and translation adjustments. Other investments, net Gain (Loss) on Other Securities, Excluding Debt and Equity Securities Gain (Loss) on Other Securities, Excluding Debt and Equity Securities Schedule of the Credit Ratings of Fixed Maturities Schedule of Investment Credit Ratings [Table Text Block] Schedule of Investment Credit Ratings [Table Text Block] Total PPD for Legacy Reinsurance Segment Total AmTrust Reinsurance PPD Total AmTrust Reinsurance 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 Upfront cash Payments to Acquire Businesses, Gross Net unrealized gains on fixed maturity investments Investments, Net Unrealized Gain (Loss) Investments, Net Unrealized Gain (Loss) Non-PEO NEO Non-PEO NEO [Member] 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 Fee revenue Fee revenue Fee Income Genesis Legacy Solutions Genesis Legacy Solutions [Member] Genesis Legacy Solutions 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] All Award Types Award Type [Domain] 2027 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] Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block] Restricted Cash and Investments Items [Line Items] Restricted Cash and Investments [Line Items] Restricted Cash and Investments [Line Items] Number of directors Number Of Directors Number Of Directors Compensation Amount Outstanding Recovery Compensation Amount Luke Ledbetter Luke Ledbetter [Member] Luke Ledbetter Senior Notes - MHNC – 7.75% 2013 Senior Notes Senior Notes 2013 [Member] Senior Notes 2013 [Member] 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] Estimate of Fair Value Measurement Fair Value Estimate of Fair Value Measurement [Member] % of Total Fair Value, Investments, Entities That Calculate Net Asset Value Per Share, Unfunded Commitments, Percentage Of Total Fair Value, Investments, Entities That Calculate Net Asset Value Per Share, Unfunded Commitments, Percentage Of Total Policy inception, grace period Insurance Contracts, Program Fee Receivables, Premium Receivable, Collection Period Insurance Contracts, Program Fee Receivables, Premium Receivable, Collection Period 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] 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 Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] Number of reinsurance agreements, open Reinsurance Agreement, Open Reinsurance Agreement, Open Adjustment for reclassification of net realized gains recognized in net loss Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax Revenues Revenues [Abstract] Non-U.S. government bonds Non-U.S. government bonds Foreign Government Debt [Member] Net realized and unrealized gains (losses) on investment, gross losses Realized And Unrealized Loss On Investments Realized And Unrealized Loss On Investments 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] Purchases Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 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 Net loss available to Kestrel common shareholders before discontinued operations, diluted Net Income (Loss) from Continuing Operations Available to Common Shareholders, Diluted Company Selected Measure Name Company Selected Measure Name Fair Value Measurement [Domain] Fair Value Measurement [Domain] Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Stock Appreciation Rights (SARs) Stock Appreciation Rights (SARs) [Member] 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 Net loss attributable to Kestrel common shareholders, diluted Net Income (Loss) Available to Common Stockholders, Diluted Stockholders' Equity Note [Abstract] Stockholders' Equity Note [Abstract] Commitments, Contingencies and Guarantees Commitments and Contingencies Disclosure [Text Block] Weighted average number of common shares - diluted (in shares) Weighted average number of common shares - diluted (in shares) Weighted Average Number of Shares Outstanding, Diluted 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] Legacy Reinsurance Legacy Reinsurance Segment Legacy Reinsurance Segment [Member] Legacy Reinsurance Segment Entity Small Business Entity Small Business Income Tax Disclosure [Abstract] Fair value Fixed Maturities, Continuous Unrealized Loss Position, Fair Value [Abstract] Fixed Maturities, Continuous Unrealized Loss Position, Fair Value [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 Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] 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 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 Income Taxes Income Tax Disclosure [Text Block] AEL AEL [Member] AEL [Member] Awards Close in Time to MNPI Disclosures, Table Awards Close in Time to MNPI Disclosures [Table Text Block] Schedule of Investments [Table] Schedule of Investments [Table] Shares acquired, average cost (in dollars per share) Shares Acquired, Average Cost Per Share % of Total fair value Fixed Maturities, Percent of Total Fair Value Fixed Maturities, Percent of Total Fair Value % of Total Equity Method Investments, Percent Of Total Equity Method Investments, Percent Of Total Document Type Document Type Significant Unobservable Inputs (Level 3) Fair Value, Inputs, Level 3 [Member] Schedule of Reconciliation to Consolidated Total Assets Reconciliation of Assets from Segment to Consolidated [Table Text Block] Earnings per Common Share Earnings Per Share [Text Block] Name Outstanding Recovery, Individual Name Percent of losses with respect to current lines of business, excluding those above covered business threshold to related party Related Party Transaction, Percent of Losses With Respect to Current Lines of Business, Excluding Those Above Covered Business Threshold To Related Party Related Party Transaction, Percent of Losses With Respect to Current Lines of Business, Excluding Those Above Covered Business Threshold To Related Party Additional paid-in capital Additional Paid in Capital Product and Service [Axis] Product and Service [Axis] Funds withheld receivable Increase (Decrease) in Funds Held under Reinsurance Agreements Business Combination, Intangible Asset, Acquired, Finite-Lived [Table] Business Combination, Intangible Asset, Acquired, Finite-Lived [Table] Reinsurance recoverables on unpaid losses Reinsurance Recoverables on Unpaid Losses, Gross Reinsurer, Name [Domain] Reinsurer, Name [Domain] 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 Assumed Assumed Premiums Earned Statistical Measurement [Axis] Statistical Measurement [Axis] Income on funds withheld Funds Withheld Arrangement [Member] Funds Withheld Arrangement [Member] Private credit investments Private Credit Lending [Member] Private Credit Lending Premium Repayment Loan Agreement Premium Repayment Loan Agreement [Member] Premium Repayment Loan Agreement Other investments, gross gains Marketable Securities, Realized Gain Marketable Securities, Realized Gain Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Maximum limit of liability attaching Related Party Transaction, Maximum Limit of Liability Attaching Related Party Transaction, Maximum Limit of Liability Attaching Peer Group Issuers, Footnote Peer Group Issuers, Footnote [Text Block] Net loss attributable to Kestrel common shareholders, basic Net Income (Loss) Available to Common Stockholders, Basic Share Repurchase Program [Domain] Share Repurchase Program [Domain] Investment Ownership, Issued at closing of Combination Investment Ownership, At Merger Closing [Member] Investment Ownership, At Merger Closing Other comprehensive loss, after tax Net current period other comprehensive (loss) income Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Thereafter Lessee, Operating Lease, Liability, Payments Due After Year Four Lessee, Operating Lease, Liability, Payments Due After Year Four General and administrative expenses Operating 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Fair Value, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 Schedule of Fixed Maturities Table [Line Items] Schedule of Fixed Maturities Table [Line Items] [Line Items] for Schedule of Fixed Maturities Table [Table] Treasury shares, at cost (in shares) Treasury shares (in shares) Treasury Stock, Common, Shares Kestrel Intermediate Ledbetter Holdings Kestrel Intermediate Ledbetter Holdings [Member] Kestrel Intermediate Ledbetter Holdings Consolidation Items [Domain] Consolidation Items [Domain] Derivative Liability, Statement of Financial Position [Extensible Enumeration] Derivative Liability, Statement of Financial Position [Extensible Enumeration] Common Stock Ownership [Domain] Common Stock Ownership [Domain] Common Stock Ownership [Domain] Value Change - Market/Industry Factors Measurement Input, Change in Guideline Public Company TIC [Member] Measurement Input, Change in Guideline Public Company TIC Reinsurer, Name [Axis] Reinsurer, Name [Axis] Less: 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amount Long-Term Debt, Gross Post-Termination Endorsement Post-Termination Endorsement [Member] Post-Termination Endorsement [Member] Stock owned by shareholder (in shares) Investment Owned, Balance, Shares Expiration Date Trading Arrangement Expiration Date Related party transaction amount (returned) Related Party Transaction, Amounts of Transaction EQUITY Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] Collaborative arrangement, reserves expected to be commuted Collaborative Arrangement, Reserves Expected to be Commuted Collaborative Arrangement, Reserves Expected to be Commuted Fixed maturities Fixed Income Securities [Member] Other equity method investments at fair value option elected Other Investments Total unfunded commitments on other investments Other Investments [Member] 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] A+, A, A- Standard & Poor's SingleA Plus, SingleA, and SingleA Minus [Member] Standard & Poor's, A-Plus, A, A- Rating [Member] Entity Current Reporting Status Entity Current Reporting Status Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Consolidated Entities [Domain] Consolidated Entities [Domain] 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 Number of independent directors Number of Independent Directors Number of Independent Directors 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] 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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 Equity Awards Adjustments, Excluding Value Reported in Compensation Table Equity Awards Adjustments, Excluding Value Reported in the Compensation Table [Member] Commission and Other Acquisition Expenses Business Acquisition Costs [Member] Business Acquisition Costs Liabilities held for sale Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed, Liabilities Held For Sale Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed, Liabilities Held For Sale 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] 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Maiden Holdings, Ltd. [Member] Maiden Holdings, Ltd. [Member] Valuation Approach and Technique [Axis] Valuation Approach and Technique [Axis] Seiden LP & Seiden MGMT LP Seiden LP & Seiden MGMT LP [Member] Seiden LP & Seiden MGMT LP Disposal Group Classification [Domain] Disposal Group Classification [Domain] Total expenses Benefits, Losses and Expenses, Net Benefits, Losses and Expenses, Net 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 for the fair value adjustment Amortization of Debt Issuance Costs Unrealized losses of unrealized loss positions Investments, Continuous Unrealized Loss Position, Accumulated Loss Investments, Continuous Unrealized Loss Position, Accumulated Loss Investment expenses Investment Income, Investment Expense Entity Tax Identification Number Entity Tax Identification Number Discounted cash flows Valuation Technique, Discounted Cash Flow [Member] 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[Member] AUM Reinsurance Segment Investments Investment Holdings [Text Block] Reinsurance Disclosures [Abstract] Reinsurance Disclosures [Abstract] 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 period Cash and Cash Equivalent Share Repurchase Plan Share Repurchase Plan [Member] Share Repurchase Plan Common shares Privately held common stocks Common Stock [Member] 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 Significant Accounting Policies Significant Accounting Policies [Text Block] 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 Statistical Measurement [Domain] Statistical Measurement [Domain] Related party transaction, percentage of required funding on obligations Related Party Transaction, Percentage Of Required Funding On Obligations Related Party Transaction, Percentage Of Required Funding On Obligations Allowance for expected credit losses Debt Securities, Available-for-Sale, Allowance for Credit Loss, Writeoff Net incurred losses related to Prior years Prior Year Claims and Claims Adjustment Expense 2026 Lessee, Operating Lease, Liability, to be Paid, Remainder of Fiscal Year Related Party Transaction [Axis] Related Party Transaction [Axis] Valuation Approach and Technique [Domain] Valuation Approach and Technique [Domain] Net realized and unrealized gains during the period Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) Interest in loss of equity method investments Interest in loss of equity method investments Income (Loss) from Equity Method Investments 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 Unearned premiums (includes $16,815 and $17,227 from related parties in 2026 and 2025, respectively) Unearned premiums Unearned Premiums KILH KILH [Member] KILH 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 And Income Statement Disclosures Classified as Held for Sale Disposal Groups, Including Discontinued Operations [Table Text Block] Gross unrealized losses Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax Trading Arrangements, by Individual Trading Arrangements, by Individual [Table] Basic loss per share attributable to Kestrel shareholders (in dollars per share) Earnings Per Share, Basic Reinsurance Recoverable, Allowance for Credit Loss [Roll Forward] Reinsurance Recoverable, Allowance for Credit Loss [Roll Forward] Discount rate Measurement Input, Discount Rate [Member] Schedule of Reconciliation of Reportable Segments Underwriting Results to Consolidated Net Loss 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) Diluted loss from discontinued operations per share attributable to Kestrel shareholders (in dollars per share) Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Diluted Share Interest and amortization expenses Interest and amortization expenses Interest and Amortization Expenses, Net Interest and Amortization Expenses, Net Measurement Input Type [Domain] Measurement Input Type [Domain] Affiliated Entity Affiliated Entity [Member] Total unfunded commitments on alternative investments Other Investments And Equity Method Investments [Member] Other Investments And Equity Method Investments Discount for Lack of Marketability Measurement Input, Discount for Lack of Marketability [Member] 12 Months or More Fixed Maturities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value Fixed Maturities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value Award Timing MNPI Disclosure Award Timing MNPI Disclosure [Text Block] Other general and administrative expenses Other General and Administrative Expense Total Fixed Maturities, Continuous Unrealized Loss Position, Accumulated Loss Fixed Maturities, Continuous Unrealized Loss Position, Accumulated Loss Purchases of equity method investments Payments to Acquire Equity Method Investments Segment Reporting, Asset Reconciling Item [Line Items] Segment Reporting, Asset Reconciling Item [Line Items] Investment in direct lending entities Investments In Direct Lending Entities [Member] Investments In Direct Lending Entities Fair value discount on net reserves acquired Amortization expense: fair value discount on net reserves acquired Fair Value Discount on Acquired Reserves [Member] Fair Value Discount on Acquired Reserves Total liabilities and equity Liabilities and Equity Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Axis] Post-Termination Endorsement, Maximum Loss Corridor Post-Termination Endorsement, Maximum Loss Corridor [Member] Post-Termination Endorsement, Maximum Loss Corridor [Member] Cash, restricted cash and cash equivalents, end of period Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Including Discontinued Operation Assets, valued by third party, percentage Assets, Fair Value Disclosure, Valued by Third Party, Percentage Assets, Fair Value Disclosure, Valued by Third Party, Percentage General and Administrative Expenses General and Administrative Expense [Member] Schedule of Equity Method Investments [Table] Equity Method Investment [Table] 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] Foreign exchange and other gains Foreign exchange and other gains Foreign exchange and other gains, net Foreign Currency Transaction and Other Gain (Loss), before Tax Foreign Currency Transaction and Other Gain (Loss), before Tax Purchases of other investments Payments to Acquire Other Investments Net loss from continuing operations Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest Treasury shares Treasury Stock, Common [Member] Pay vs Performance Disclosure [Line Items] Contingent Receivable, measurement inputs Business Combination, Contingent Consideration, Asset, Measurement Input Business Combination, Contingent Consideration, Asset, Measurement Input Operating lease, liability Total discounted operating lease liabilities Operating Lease, Liability U.S. agency bonds – mortgage-backed US Government Agencies Debt Securities [Member] Unearned premiums Increase (Decrease) in Unearned Premiums LIABILITIES Liabilities [Abstract] Business Combination Business Combination [Text Block] Total Senior Notes Financial Liabilities Fair Value Disclosure Program Services Program Services Segment [Member] Program Services Segment Collaborative arrangement, payment of commuted reserves Collaborative Arrangement, Payment of Commuted Reserves Collaborative Arrangement, Payment of Commuted Reserves EBITDA & Commission Discount Rate Measurement Input, EBITDA and Commission Discount Rate [Member] Measurement Input, EBITDA and Commission Discount Rate 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] Schedule of Variable Interest Entities [Table] Variable Interest Entity [Table] Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Company Selected Measure Amount Company Selected Measure Amount 2029 Lessee, Operating Lease, Liability, to be Paid, Year Three Original fair value adjustment at acquisition date Debt Issuance Costs, Gross Comprehensive loss Comprehensive Income (Loss), Net of Tax, Attributable to Parent Measurement Input Type [Axis] Measurement Input Type [Axis] Name Measure Name Reinsurance recoverable on unpaid losses Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Reinsurance Recoverable on Unpaid Losses Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Reinsurance Recoverable on Unpaid Losses Due in one year or less Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, Year One Other comprehensive loss, before tax Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent Class of Stock [Line Items] Class of Stock [Line Items] Amortized cost Investments, Original or Amortized Cost Basis Investments, Original or Amortized Cost Basis Total equity method investments with fair value option Investments, Fair Value Option [Member] Investments, Fair Value Option Loss from discontinued operations, net of income tax Less: net loss from discontinued operations Loss from discontinued operations, net of income tax Net loss from discontinued operations Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent Assumed Assumed Premiums Written Schedule of Net Unrealized Losses Included in Accumulated Other Comprehensive Income Unrealized Gain (Loss) on Investments [Table Text Block] Fair value Fixed Maturities, Fair Value Fixed Maturities, Fair Value Senior notes, net Carrying value Long-Term Debt Legal Entity [Axis] Legal Entity [Axis] Total assets Assets 2027 Finite-Lived Intangible Asset, Expected Amortization, Year One Private equity investments - preferred shares 3 Privately Held Equity Investments in Preferred Stock 3 [Member] Privately Held Equity Investments in Preferred Stock 3 Third Party Agreements Third Party Agreements [Member] Third Party Agreements [Member] Cash flows from operating activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation [Abstract] Collateral by third party Reinsurance, Collateral By Third Party Reinsurance, Collateral By Third Party Basis of Presentation Organization, Consolidation and Presentation of Financial Statements Disclosure and Significant Accounting Policies [Text Block] Weighted Average Amortization Period Acquired Finite-Lived Intangible Assets, Weighted Average Useful Life Concentration Risk Type [Axis] Concentration Risk Type [Axis] Private equity funds Private Equity Funds [Member] 2030 Finite-Lived Intangible Asset, Expected Amortization, Year Four Variable Interest Entity [Line Items] Variable Interest Entity [Line Items] Other investments Total other investments at fair value Other Investments Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Debt Securities, Available-for-sale [Line Items] Debt Securities, Available-for-Sale [Line Items] Significant Other Observable Inputs (Level 2) Fair Value, Inputs, Level 2 Fair Value, Inputs, Level 2 [Member] Carrying Value Equity Method Investments Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] Business Combination [Domain] Business Combination [Domain] Related Party Agreements Related Party Agreements [Member] Related Party Agreements [Member] Equity method investments with fair value option elected Total unfunded commitments on equity method investments Extell Hudson Waterfront Holdings Equity Method Investments [Member] Plan Name [Axis] Plan Name [Axis] PEO PEO [Member] Extell Hudson Waterfront Holdings Extell Hudson Waterfront Holdings [Member] Extell Hudson Waterfront Holdings Schedule of Contractual Maturities of Fixed Maturities Investments Classified by Contractual Maturity Date [Table Text Block] Net loss before income taxes Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest UNITED STATES UNITED STATES Retained earnings (accumulated deficit) Retained Earnings [Member] Net paid losses Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid Income Tax Authority [Axis] Income Tax Jurisdiction [Axis] Cash, restricted cash and cash equivalents, beginning of period Cash, restricted cash and cash equivalents, end of period, excluding held-for-sale Total cash, restricted cash and cash equivalents, end of period Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Net Income (Loss) Income Statement [Abstract] Other comprehensive (loss) income before reclassifications OCI, before Reclassifications, before Tax, Attributable to Parent Premiums written Premiums Written, Net [Abstract] Purchases of fixed maturities  Payments to Acquire Marketable Securities Total Level 3 Investments Investments, Fair Value Disclosure Product and Service [Domain] Product and Service [Domain] Senior Notes - MHLA – 6.625% 2016 Senior Notes Senior Notes 2016 [Member] Senior Notes 2016 [Member] Diluted loss from continuing operations per share attributable to Kestrel common shareholders (in dollars per share) Diluted loss from continuing operations per share attributable to Kestrel shareholders (in dollars per share) Income (Loss) from Continuing Operations, Per Diluted Share Reinsurance, excess retention, amount reinsured, per policy Reinsurance, Excess Retention, Amount Reinsured, Per Policy Equity securities, measurement input Equity Securities, FV-NI, Measurement Input Restatement does not require Recovery Restatement Does Not Require Recovery [Text Block] Business Combination [Table] Business Combination [Table] Organization, Consolidation and Presentation of Financial Statements [Abstract] Organization, Consolidation and Presentation of Financial Statements [Abstract] Prior notice to be given before redemption date Debt Instrument, Prior Notice, Redemption Period, Start Date Debt Instrument, Prior Notice, Redemption Period, Start Date Number of votes per share Common Stock, Number Of Votes Per Share Common Stock, Number Of Votes Per Share Schedule of Purchase Price of Assets and Liabilities Assumed Business Combination, Recognized Asset Acquired and Liability Assumed [Table Text Block] Lease payments to escalating fee, percentage Operating Lease, Escalating Fee Percentage Operating Lease, Escalating Fee Percentage City Area Code City Area Code Award Timing, How MNPI Considered Award Timing, How MNPI Considered [Text Block] AUM Financial Services, Inc. AUM Financial Services, Inc. [Member] AUM Programs Financial Services, Inc. Weighted Average Amortization Period Weighted Average Amortization Period [Abstract] Weighted Average Amortization Period Debt Securities, Trading, and Equity Securities, FV-NI [Table] Debt Securities, Trading, and Equity Securities, FV-NI [Table] Cash flows from investing activities: Cash Provided by (Used in) Investing Activity, Including Discontinued Operation [Abstract] General and administrative expenses General and Administrative Expense Kestrel Group, Ltd. Kestrel Group, Ltd. [Member] Kestrel Group, Ltd. Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Operating Lease, Liability, Statement of Financial Position [Extensible Enumeration] Operating Lease, Liability, Statement of Financial Position [Extensible Enumeration] Accrued interest receivable Interest Receivable Related Party Transactions [Abstract] Related Party Transactions [Abstract] Cash consideration paid to shareholders at Closing for fractional shares Business Combination, Consideration Transferred, Cash Consideration Paid To Shareholders Business Combination, Consideration Transferred, Cash Consideration Paid To Shareholders Total equity securities subject to contractual sale restrictions Equity Securities, FV-NI U.S. treasury bonds US Treasury Bond Securities [Member] Net paid losses related to Current year Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Current Year Net realized and unrealized investment gains Net realized and unrealized investment gains Net realized and 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matched discount rates Measurement Input, Duration Matched Discount Rates [Member] Measurement Input, Duration Matched Discount Rates Fair Value Measurements Fair Value of Financial Instruments, Policy [Policy Text Block] AmTrust Quota Share Reinsurance Segment AmTrust Quota Share Reinsurance Segment [Member] AmTrust Quota Share Reinsurance Segment [Member] Investments: Investments [Abstract] Entity [Domain] Entity [Domain] Net cash provided by investing activities Cash Provided by (Used in) Investing Activity, Including Discontinued Operation Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table [Member] Document Fiscal Year Focus Document Fiscal Year Focus Schedule of Effect of Ceded Reinsurance on Net Premiums Written and Earned and on Net Loss and LAE Effects of Reinsurance [Table Text Block] Basis of Presentation Basis of Accounting, Policy [Policy Text Block] Operating lease, right-of-use asset Operating Lease, Right-of-Use Asset Schedule of Gain (Loss) on Securities [Table] Schedule of Gain (Loss) on Securities [Table] Number of insurance carriers Number of Insurance Carriers Number of Insurance Carriers Plan Name [Domain] Plan Name [Domain] Principal Amount Reported Value Measurement [Member] % of Total Other Investments, Percent of Total Other Investments, Percent of Total Change in net unrealized investment losses 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 Equity [Abstract] Reserve for reported loss and LAE Liability for Unpaid Claims and Claims Adjustment Expense, Reported Claims, Amount Premiums earned Premiums Earned, Net [Abstract] AA+, AA, AA- Standard & Poor's, AA Plus, AA, AA Minus Rating [Member] Standard & Poor's, AA+, AA, AA- Rating Segment Information Segment Reporting Disclosure [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 Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] U.S. treasury bonds US Treasury Securities [Member] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Schedule of Total Unfunded Commitments Other Commitments [Table Text Block] Other investments Other Debt Obligations [Member] Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total Shareholder Return [Text Block] Contingent consideration Business Combination, Contingent Consideration, Liability Weighted Average Weighted Average [Member] Fair Value, Recurring and Nonrecurring [Table] Fair Value, Recurring and Nonrecurring [Table] Amortization of intangible assets Amortization of Intangible Assets Equity Volatility Measurement Input, Price Volatility [Member] Schedule of Accumulated Other Comprehensive Income Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Net loss available to Kestrel common shareholders before discontinued operations, basic Net Income (Loss) from Continuing Operations Available to Common Shareholders, Basic Other comprehensive loss Other Comprehensive Income (Loss), before Tax [Abstract] Asset Purchase Agreement Asset Purchase Agreement [Member] Asset Purchase Agreement Insurance liabilities net Insurance Liabilities Net Insurance Liabilities Net Direct Direct Premiums Written LPT/ADC Agreement LPT/ADC Agreement [Member] LPT/ADC Agreement AmTrust Reinsurance AmTrust Reinsurance legacy business AmTrust Reinsurance Segment [Member] AmTrust Reinsurance Segment [Member] Arrangement Duration Trading Arrangement Duration Schedule of Cost and Fair Values of the Equity Securities and Privately Held Securities Held Subject to Contractual Sale Restrictions Debt Securities, Trading, and Equity Securities, FV-NI [Table Text Block] Segments [Axis] Segments [Axis] Maiden Reinsurance Maiden Reinsurance [Member] Maiden Reinsurance Local Phone Number Local Phone Number 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. 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