Short-term investments Short-term investments Other Short-Term Investments Short-term investments and other, gross realized gains Short Term Investments And Other Gross Realized Gains Represents the gross profit realized on the sale of short term investment and other. Bank loan participations: Bank Loan Participations [Abstract] Sales – fixed maturity securities Proceeds from Sale of Debt Securities, Available-for-Sale Discontinued operations (in dollars per share) Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Diluted Share Statistical Measurement [Domain] Statistical Measurement [Domain] Interest expense Disposal Group, Including Discontinued Operation, Interest Expense Line of credit (up to) Line of credit Line of Credit Facility, Maximum Borrowing Capacity Reserve For Losses And Loss Adjustment Expenses [Table] Reserve For Losses And Loss Adjustment Expenses [Table] A table or schedule providing information pertaining to reserve for losses and Loss adjustment expenses. Convertible preferred stock, shares issued upon conversion Convertible Preferred Stock, Shares Issued upon Conversion Short-term investments and other, gross realized losses Short Term Investments And Other Gross Realized Losses Represents the gross loss realized on the sale of short term investment and other. Award Type [Domain] Award Type [Domain] Sales Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales Investment, Name [Domain] Investment, Name [Domain] Unvested, beginning of period (in shares) Unvested, end of period (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number Senior Debt Debt Disclosure [Text Block] Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] Short-Duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Schedule of Available-for-Sale Investments Schedule of Available-for-Sale Securities Reconciliation [Table Text Block] Segment Reporting [Abstract] Segment Reporting [Abstract] Discontinued Operations and Disposal Groups [Abstract] Transfers out of Level 3 Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 Investment, Name [Axis] Investment, Name [Axis] Corporate Corporate Debt Securities [Member] Beginning balance Ending balance Asset value Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value Commitments and contingent liabilities Commitments and Contingencies Exercisable, end of period (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Number Capital Stock and Equity Awards Equity [Text Block] Specialty Admitted Insurance Specialty Admitted Insurance [Member] Represents information regarding specialty admitted insurance. Geographical [Axis] Geographical [Axis] Change in net unearned premiums Disposal Group, Including Discontinued Operation, (Increase) Decrease in Unearned Premiums, Net Disposal Group, Including Discontinued Operation, (Increase) Decrease in Unearned Premiums, Net Reserve for losses and loss adjustment expenses gross of reinsurance recoverables on unpaid losses and loss adjustment expenses at end of period Liability for Claims and Claims Adjustment Expense Vesting of RSUs (in shares) Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures Net cash provided by investing activities of discontinued operations Cash Provided by (Used in) Investing Activities, Discontinued Operations Business Acquisition [Line Items] Business Acquisition [Line Items] 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] Cash payment Proceeds from Divestiture of Businesses Subsequent Event Type [Domain] Subsequent Event Type [Domain] Dividends on common shares Payments of Ordinary Dividends, Common Stock Jrg Re Jrg Re [Member] Represents information about JRG Re. Diluted (in dollars per share) Earnings Per Share, Diluted Ceded written premiums Disposal Group, Including Discontinued Operation, Ceded Premiums Written Disposal Group, Including Discontinued Operation, Ceded Premiums Written Payables to reinsurers Reinsurance Payable Unrealized losses Bank Loan Participations, Unrealized Losses, Credit Related Impairments Bank Loan Participations, Unrealized Losses, Credit Related Impairments Cumulative amounts ceded under loss portfolio transfer Cumulative Amounts Ceded Under Loss Portfolio Transfer Cumulative Amounts Ceded Under Loss Portfolio Transfer Significant Unobservable Inputs Level 3 Fair Value, Inputs, Level 3 [Member] Schedule of Gain (Loss) on Securities [Table] Schedule of Gain (Loss) on Securities [Table] Preferred stock, dividend term Preferred Stock, Dividend Term Preferred Stock, Dividend Term Payments for reinsurance Payments for Reinsurance Beginning of period (in shares) End of period (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number After five years through ten years Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 Trading Symbol Trading Symbol Amount of letters of credit issued Letters of Credit Outstanding, Amount Purchases Payments to Acquire Equity Method Investments Granted (in dollars per share) Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price Preferred stock, discount rate, percentage Preferred Stock, Discount Rate, Percentage Preferred Stock, Discount Rate, Percentage Non-employee directors Non-employee Directors [Member] Non-employee Directors [Member] Preferred stock, dividend payment rate, variable spread Preferred Stock, Dividend Payment Rate, Variable Spread Preferred Stock, Dividend Payment Rate, Variable Spread Add: Reinsurance recoverables on unpaid losses and loss adjustment expenses at end of period Reinsurance Recoverables on Unpaid Losses, Gross Tax on net unrealized gains (losses) OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment, Tax Net income Net income Net Income (Loss) Fixed maturity securities Total fixed maturity securities, available-for-sale Debt Securities [Member] Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] Indefinite-lived Intangible Assets, Major Class Name [Domain] Indefinite-Lived Intangible Assets, Major Class Name [Domain] After one year through five years Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year One Through Five Indemnity Trust And Loss Fund Trust Indemnity Trust And Loss Fund Trust [Member] Indemnity Trust And Loss Fund Trust Total Intangible Assets, Gross Intangible Assets, Gross (Excluding Goodwill) Deferred policy acquisition costs Deferred Policy Acquisition Cost Liabilities and Shareholders’ Equity Liabilities and Equity [Abstract] Required collateral, percentage Required Collateral, Percentage Required Collateral, Percentage Lapsed (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Lapsed in Period Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Lapsed in Period Total principal balance received Proceeds from Sale and Maturity of Other Investments Shareholders’ equity: Equity, Attributable to Parent [Abstract] Total investments available-for-sale, Gross Unrealized Losses Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax Other Operating Expenses [Abstract] Other Operating Expenses and Other Expenses [Abstract] Other Operating Expenses and Other Expenses [Abstract] Exercised (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period BBB- or better Standard & Poor's, BBB- or Better Rating [Member] Standard & Poor's, BBB- or Better Rating [Member] Ceded premiums payable Ceded Premiums Payable Schedule of Reconciliation of Numerator and Denominator of Basic and Diluted Earnings Per Share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Vesting period (in years) Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period Schedule of Gross Carrying Amounts for Indefinite-Lived Intangible Assets Schedule of Indefinite-Lived Intangible Assets [Table Text Block] Schedule of Reconciliation of Securities Measured at Fair Value on a Recurring Basis Using Significant Unobservable Inputs Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] Ceded written premiums Ceded Premiums Written Cash Flows from Discontinued Operations Net Cash Provided by (Used in) Discontinued Operations [Abstract] Pre close dividend Selling Agreement, Pre Close Dividend Selling Agreement, Pre Close Dividend Private debt Private Debt [Member] Private Debt Shares Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Bank loan participations, at fair value Bank loan participations Fair Value, Option, Loans Held as Assets, Aggregate Fair Value Fair Value, Option, Loans Held as Assets, Aggregate Fair Value Exercised (in dollars per share) Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Quoted Prices in Active Markets for Identical Assets Level 1 Fair Value, Inputs, Level 1 [Member] Senior revolving credit facility Line of Credit Facility, Current Borrowing Capacity Carrying Value Reported Value Measurement [Member] Goodwill Segment goodwill Goodwill Fortitude Reinsurance Fortitude Reinsurance [Member] Fortitude Reinsurance Equity Components [Axis] Equity Components [Axis] Financial Instruments [Domain] Financial Instruments [Domain] Total revenues Disposal Group, Including Discontinued Operation, Revenue Number of shares available for grant (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant Investment Type [Axis] Investment Type [Axis] Current year Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Current Year Purchases Payment To Acquire Bank Loan Participations Represents payment to acquire Bank loan participations. Measurement Basis [Axis] Measurement Basis [Axis] Granted (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross Entity Small Business Entity Small Business Weighted-average common shares outstanding: Weighted Average Number of Shares Outstanding, Basic [Abstract] Investments [Domain] Investments [Domain] Prior years Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Prior Years Other Comprehensive (Loss) Income Comprehensive Income (Loss) Note [Text Block] Local Phone Number Local Phone Number Fair Value Measurement [Domain] Fair Value Measurement [Domain] Deferred reinsurance gain Disposal Group, Including Discontinued Operation, Deferred Reinsurance Gain Disposal Group, Including Discontinued Operation, Deferred Reinsurance Gain Forecast Forecast [Member] Dividend declared per common share (in dollars per share) Dividend declared per share (in dollars per share) Common Stock, Dividends, Per Share, Declared Unrealized (losses) gains arising during the period, net of U.S. income taxes OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, after Tax Measurement Frequency [Axis] Measurement Frequency [Axis] Net Investment Income [Line Items] Net Investment Income [Line Items] Add: Incurred losses and loss adjustment expenses net of reinsurance: Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims [Abstract] Schedule of Available-for-Sale Investments by Contractual Maturity Investments Classified by Contractual Maturity Date [Table Text Block] RSUs RSUs Restricted Stock Units (RSUs) [Member] Issuance costs Payments of Stock Issuance Costs Fair Value Measurement Inputs and Valuation Techniques [Table] Fair Value Measurement Inputs and Valuation Techniques [Table] Trademarks Trademarks [Member] Portion at Fair Value Measurement Portion at Fair Value Measurement [Member] Acquired Intangible Assets [Line Items] Acquired Intangible Assets [Line Items] Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Assets Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] Allowance for credit losses on reinsurance recoverables Reinsurance Recoverables on Unpaid Losses, Allowance 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] Accrued investment income Accrued Investment Income Receivable Vesting of RSUs Share-Based Payment Arrangement, Decrease for Tax Withholding Obligation Assets deposited for securing letters of credit Assets Deposited For Securing Letters Of Credit Represents amount of assets deposited for securing letters of credit. Dilutive potential common shares (in shares) Weighted Average Number of Shares Outstanding, Diluted, Adjustment Cash and cash equivalents Disposal Group, Including Discontinued Operation, Cash and Cash Equivalents Number of shares issued during period (in shares) Sale of Stock, Number of Shares Issued in Transaction After ten years Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 10 Variable Interest Entities Consolidation, Variable Interest Entity, Policy [Policy Text Block] Total revenues Segment revenues Revenues Schedule of Carrying Value and Fair Value of Financial Instruments Fair Value, by Balance Sheet Grouping [Table Text Block] Other expenses Disposal Group, Including Discontinued Operation, Other Expense Cash equivalent collateral returned to trust Cash Equivalent Collateral Returned to Trust Cash Equivalent Collateral Returned to Trust Commercial mortgage and asset-backed Commercial Mortgage-Backed Securities [Member] Series A redeemable preferred shares – 2024 and 2023: $0.00125 par value; 20,000,000 shares authorized; 150,000 shares issued and outstanding Temporary Equity, Carrying Amount, Attributable to Parent 2013 Facility 2013 Facility [Member] 2013 Facility Reserve for losses and loss adjustment expenses net of reinsurance recoverables at beginning of period Reserve for losses and loss adjustment expenses net of reinsurance recoverables at end of period Liability for Unpaid Claims and Claims Adjustment Expense, Net Other expenses Other Expenses Premiums receivable and agents’ balances, net Disposal Group, Including Discontinued Operation, Premiums And Other Receivables, Net Disposal Group, Including Discontinued Operation, Premiums And Other Receivables, Net Award Type [Axis] Award Type [Axis] Number of securities excluded from the calculations of diluted earnings per share (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Granted (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period Plan Name [Domain] Plan Name [Domain] Document Quarterly Report Document Quarterly Report Underwriting profit Underwriting Profit (Loss) Represents the amount related to underwriting profit (loss) during the period. Commitment to investment in notes Commitment To Investment In Notes Commitment To Investment In Notes Interest expense Interest expense Interest expense Interest Expense Residential mortgage-backed Residential Mortgage Backed Fair Value Represents fair value of residential mortgage backed. Dividends on common shares Dividends, Common Stock Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Total loss and loss adjustment expense payments Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid Maximum number of shares available for issuance (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized Bank holding companies Bank Holding Companies [Member] Name of the investment category. Schedule of Dividends Dividends Declared [Table Text Block] Stockholders' Equity Note [Abstract] Stockholders' Equity Note [Abstract] Estimates and Assumptions Use of Estimates, Policy [Policy Text Block] Long-term Debt, Type [Domain] Long-Term Debt, Type [Domain] Schedule of Other Operating Expenses Schedule of Other Operating Cost and Expense, by Component [Table Text Block] Securities available-for-sale: Fixed maturity securities, available-for-sale: Debt Securities, Available-for-Sale [Abstract] Entity File Number Entity File Number Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Aleka Aleka [Member] Aleka Schedule Of Acquired Intangible Assets [Table] Schedule Of Acquired Intangible Assets [Table] Represents the tabular information related to intangible assets acquired in the acquisition. Amortization of intangible assets Amortization of intangible assets Amortization of Intangible Assets Entity Shell Company Entity Shell Company Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] Unearned premiums Unearned Premiums Adopted and Prospective Accounting Standards New Accounting Pronouncements, Policy [Policy Text Block] Temporary Equity [Line Items] Temporary Equity [Line Items] Dividends on Series A preferred shares Less: Dividends on Series A preferred shares Temporary Equity, Dividends, Adjustment Write down of JRG Re to fair value less cost to sell Disposal Group, Including Discontinued Operation, Write Down Disposal Group, Including Discontinued Operation, Write Down Counterparty Name [Domain] Counterparty Name [Domain] Rate of interest Investment Interest Rate Various LLCs Various LLCs [Member] Various LLCs Cash, cash equivalents, and restricted cash equivalents at beginning of period Cash, cash equivalents, and restricted cash equivalents at end of period Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents Asset Class [Axis] Asset Class [Axis] Accumulated Amortization Finite-Lived Intangible Assets, Accumulated Amortization Equity securities, gross realized losses Equity Securities, FV-NI, Realized Loss Per share price (in dollars per share) Sale of Stock, Price Per Share Private Placement Private Placement [Member] Weighted average common shares outstanding: Weighted Average Number of Shares Outstanding Reconciliation [Abstract] Fixed maturity securities, 12 months or more, fair value Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer Common stock, shares issued (in shares) Common Stock, Shares, Issued Schedule of RSU Activity Schedule of Nonvested Restricted Stock Units Activity [Table Text Block] Vested (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period Schedule of Net Unrealized Gains and Losses on Investments Unrealized Gain (Loss) on Investments [Table Text Block] Series A convertible preferred shares (in dollars per share) Temporary Equity, Par or Stated Value Per Share Raiser Raiser [Member] Raiser [Member] Security Exchange Name Security Exchange Name Fixed maturity securities, gross unrealized losses Gross unrealized losses Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss Investment Income [Table] Investment Income [Table] Sale of stock, consideration received on transaction Sale of Stock, Consideration Received on Transaction Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax Short-term investments and other Short Term Investments And Other Gross Realized Gains (Losses) Short Term Investments And Other Gross Realized Gains (Losses) Options Employee Stock Option [Member] Weighted-average period of unrecognized share based compensation expense Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition Maximum Maximum [Member] Total comprehensive income Comprehensive Income (Loss), Net of Tax, Attributable to Parent Unrecognized share based compensation expense Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount Document Type Document Type Total expenses Benefits, Losses and Expenses External Credit Rating, Standard & Poor's [Domain] External Credit Rating, Standard & Poor's [Domain] Accrued investment income Disposal Group, Including Discontinued Operation, Accrued Investment Income Receivable Disposal Group, Including Discontinued Operation, Accrued Investment Income Receivable Net investment income Disposal Group, Including Discontinued Operation, Net Investment Income Disposal Group, Including Discontinued Operation, Net Investment Income Discontinued operations (in dollars per share) Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic Share Entity Address, Address Line One Entity Address, Address Line One Entity Address, Address Line Two Entity Address, Address Line Two Entity Address, Address Line Three Entity Address, Address Line Three Other income and expenses Other Income And Expenses Represents other income and expenses. Investment in variable interest entities Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount Contingent Liabilities [Line Items] Contingent Liabilities [Line Items] Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Liabilities Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Subsequent Event [Table] Subsequent Event [Table] Schedule of Net Realized Gains and Losses on Investments Realized Gain (Loss) on Investments [Table Text Block] Basis of Presentation Basis of Accounting, Policy [Policy Text Block] Purchases – fixed maturity securities Payments to Acquire Debt Securities, Available-for-Sale Weighted- Average Exercise Price Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] Dividends on Series A preferred shares Dividends on Series A preferred shares Payments of Ordinary Dividends, Preferred Stock and Preference Stock Business Acquisition [Axis] Business Acquisition [Axis] Funds held Disposal Group, Including Discontinued Operation, Funds Held under Reinsurance Agreements, Liability Disposal Group, Including Discontinued Operation, Funds Held under Reinsurance Agreements, Liability Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Net gain (loss) in bank loan participations Bank loan participations Bank Loan Participations, Net Gain (Loss) Bank Loan Participations, realized and unrealized net gains (losses) Subsequent Event Subsequent Event [Member] Schedule of Gross Carrying Amounts and Accumulated Amortization for Finite-Lived Intangible Assets Schedule of Finite-Lived Intangible Assets [Table Text Block] Income Statement [Abstract] Income Statement [Abstract] Forfeited (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Forfeitures in Period Net investment income Net investment income Net Investment Income Title of 12(b) Security Title of 12(b) Security LPT Trust And Loss Fund Trust LPT Trust And Loss Fund Trust [Member] LPT Trust And Loss Fund Trust Held-for-Sale and Discontinued Operations Discontinued Operations, Policy [Policy Text Block] Equity securities: Short-Term Investments [Abstract] Commercial Auto Business Commercial Auto Business [Member] Commercial Auto Business Other assets Disposal Group, Including Discontinued Operation, Other Assets Restricted stock unit dividend equivalents Restricted Stock Unit Dividend Equivalents Represents amount of dividend equivalent of RSU's. Identifiable intangibles not subject to amortization Indefinite-Lived Intangible Assets (Excluding Goodwill) Associated Trust Agreement [Domain] Associated Trust Agreement [Domain] Associated Trust Agreement [Domain] Operating Segments Operating Segments [Member] Unvested, beginning of period (in dollars per share) Unvested, end of period (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Stock options, restricted share units ("RSU's") and convertible preferred stock Stock Options, Restricted Stock Units And Convertible Preferred Stock [Member] Stock options and share instrument which is convertible to stock or an equivalent amount of cash, after a specified period of time or when specified performance conditions are met. Schedule of Other Invested Assets Other Invested Asset [Table Text Block] Tabular disclosure of other invested assets consisting of private debt and equity investments. Prior years - retroactive reinsurance Losses and loss adjustment expenses - retroactive reinsurance Prior Year Claims and Claims Adjustment Expense, Retroactive Reinsurance Prior Year Claims and Claims Adjustment Expense, Retroactive Reinsurance U.S. income taxes OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, Tax Schedule of Reconciliation of Beginning and Ending Reserve Balances for Losses and Loss Adjustment Expenses Schedule of Liability for Unpaid Claims and Claims Adjustment Expense [Table Text Block] Diluted Net income (loss) per common share, Diluted Earnings Per Share, Diluted [Abstract] Entity Tax Identification Number Entity Tax Identification Number Dividends on Series A preferred shares Dividends, Preferred Stock Losses and loss adjustment expenses Disposal Group, Including Discontinued Operation, Losses And Loss Adjustment Expenses Disposal Group, Including Discontinued Operation, Losses And Loss Adjustment Expenses Number of insurance companies Number Of Insurance Companies This element represents number of insurance companies owned by the entity. (Loss) income from discontinued operations Net Income (Loss) from Discontinued Operations Available to Common Shareholders, Basic Common stock, covenant, threshold, cash paid (in dollars per share) Common Stock, Dividend Per Share, Cash Payments, Threshold Common Stock, Dividend Per Share, Cash Payments, Threshold Other operating expenses Disposal Group, Including Discontinued Operation, Operating Expense Other underwriting expenses of the operating segments Other Underwriting Expense Percentage of then-applicable conversion price threshold Preferred Stock, Convertible, Mandatory Conversion, Percentage Preferred Stock, Convertible, Mandatory Conversion, Percentage Statistical Measurement [Axis] Statistical Measurement [Axis] Letters of credit facility, amount Letter Of Credit Facility Amount Represents amount of letter of credit facility. Discontinued Operations Disposal Groups, Including Discontinued Operations, Disclosure [Text Block] Financial Instrument [Axis] Financial Instrument [Axis] Entity Interactive Data Current Entity Interactive Data Current Payout for achievement, maximum Share-Based Compensation Arrangement by Share-Based Payment Award, Payout For Achievement, Maximum Share-Based Compensation Arrangement by Share-Based Payment Award, Payout For Achievement, Maximum Debt Securities, Available-for-sale [Table] Debt Securities, Available-for-Sale [Table] Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Gain (Loss) on Securities [Line Items] Gain (Loss) on Securities [Line Items] Deduct: Change in deferred reinsurance gain - retroactive reinsurance Increase (Decrease) In Deferred Reinsurance Gain Increase (Decrease) In Deferred Reinsurance Gain Deferred policy acquisition costs Disposal Group, Including Discontinued Operation, Deferred Policy Acquisition Costs Disposal Group, Including Discontinued Operation, Deferred Policy Acquisition Costs Segments [Domain] Segments [Domain] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Reinsurance recoverables Reinsurance Recoverables, Gross Number of notes issued Number Of Notes Issued Number Of Notes Issued Payout for achievement, target Share-Based Compensation Arrangement by Share-Based Payment Award, Payout For Achievement, Target Share-Based Compensation Arrangement by Share-Based Payment Award, Payout For Achievement, Target Consolidation Items [Domain] Consolidation Items [Domain] Retained deficit Retained Earnings (Accumulated Deficit) Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] Transfers in to Level 3 Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 Change in net unearned premiums (Increase) Decrease in Unearned Premiums, Net Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Amount to settle litigation Amount To Settle Litigation Amount To Settle Litigation Prior years - excluding retroactive reinsurance Development on prior year loss reserves Prior Year Claims and Claims Adjustment Expense Equity securities, at fair value (cost: 2024 – $119,788; 2023 – $114,107) Equity securities Equity Securities, FV-NI Assets held-for-sale (Note 2 - discontinued operations) Assets held for sale Disposal Group, Including Discontinued Operation, Assets Counterparty Name [Axis] Counterparty Name [Axis] Residential mortgage-backed Residential Mortgage-Backed Securities [Member] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Number of credit facilities Number Of Letter Credit Facilities Number Of Letter Credit Facilities Continuing operations (in dollars per share) Income (Loss) from Continuing Operations, Per Basic Share Common stock, shares outstanding (in shares) Balance (in shares) Balance (in shares) Common Stock, Shares, Outstanding Maturities and calls – fixed maturity securities Proceeds from Maturities, Prepayments and Calls of Debt Securities, Available-for-Sale Other invested assets Carrying Value Other Investments Disposal Group Name [Domain] Disposal Group Name [Domain] Premiums receivable and agents’ balances, net Premiums and Other Receivables, Net Basic Net income (loss) per common share, Basic Earnings Per Share, Basic [Abstract] Schedule of Components of Comprehensive Loss Comprehensive Income (Loss) [Table Text Block] Other operating expenses Total Other Cost and Expense, Operating Asset Class [Domain] Asset Class [Domain] Discontinued operations (Note 2): Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent [Abstract] Common stock, par value (in dollars per share) Common Stock, Par or Stated Value Per Share Sale of Stock [Axis] Sale of Stock [Axis] Rasier and Aleka Rasier And Aleka [Member] Rasier And Aleka U.S. income taxes Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax Class of Stock [Domain] Class of Stock [Domain] Total invested assets Disposal Group, Including Discontinued Operation, Total Invested Assets Disposal Group, Including Discontinued Operation, Total Invested Assets Net cash provided by investing activities Net Cash Provided by (Used in) Investing Activities Total equity securities Equity Securities, FV-NI, Current Outstanding commitments to invest Commitment to Investment In Limited Partnership Commitment to Investment In Limited Partnership Net income available to common shareholders Net Income (Loss) Available to Common Stockholders, Basic Shares Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding [Roll Forward] Number of issuers Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions Net income from continuing operations Net income from continuing operations Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent Discontinued Operations, Held-for-Sale Discontinued Operations, Held-for-Sale [Member] Liabilities held-for-sale (Note 2 - discontinued operations) Liabilities held for sale Disposal Group, Including Discontinued Operation, Liabilities Effective tax Effective Income Tax Rate Reconciliation, Percent Sales Proceeds From Bank Loan Participations Represents cash inflow from sales of bank loan participations. Securities receivable or payable, net Payments for (Proceeds from) Unsettled Investments, Net Payments for (Proceeds from) Unsettled Investments, Net Available-for-sale fixed maturity securities and equity securities Securities (Assets) [Member] Credit Facility [Axis] Credit Facility [Axis] Unrealized (losses) gains arising during the period, before U.S. income taxes OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment and Tax Total liabilities Liabilities Estimated transaction value Disposal Group, Including Discontinued Operation, Consideration Accumulated Other Comprehensive Loss AOCI Attributable to Parent [Member] Fixed maturity securities, fair value Total fair value Debt Securities, Available-for-Sale, Unrealized Loss Position Measurement Frequency [Domain] Measurement Frequency [Domain] Accrued expenses Disposal Group, Including Discontinued Operation, Accrued Liabilities Title of Individual [Axis] Title of Individual [Axis] Letter of Credit 30 Million Letter Of Credit 30 Million [Member] Letter Of Credit 30 Million Number of shares to be received per PRSU (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Contingent Right, Number Of Shares To Be Received Share-Based Compensation Arrangement by Share-Based Payment Award, Contingent Right, Number Of Shares To Be Received Segment assets Assets Excluding Assets Held For Sale Assets Excluding Assets Held For Sale James River Group, Inc. James River Group Inc [Member] Represents information regarding James River Group, Inc. Disposal Groups, Including Discontinued Operations [Table] Disposal Groups, Including Discontinued Operations [Table] Plan Name [Axis] Plan Name [Axis] Debt Disclosure [Abstract] Debt Disclosure [Abstract] Number of trading days Preferred Stock, Convertible, Number Of Trading Days Preferred Stock, Convertible, Number Of Trading Days U.S. tax benefit on share based compensation expense Share-Based Payment Arrangement, Expense, Tax Benefit Number of reportable segments Number of Reportable Segments Estimated loss on sale Discontinued Operation, Provision for Loss (Gain) on Disposal, before Income Tax Net income (loss) per common share: Earnings Per Share [Abstract] Earnings Per Share [Abstract] Subsequent Event [Line Items] Subsequent Event [Line Items] Temporary Equity, by Class of Stock [Table] Temporary Equity, by Class of Stock [Table] Fixed maturity securities, less than 12 months, fair value Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months After one year through five years Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five Investment Income Investment Income, Net Total expenses Disposal Group, Including Discontinued Operation, Total Expense Disposal Group, Including Discontinued Operation, Total Expense Preferred stock Preferred Stock [Member] Gross written premiums Disposal Group, Including Discontinued Operation, Gross Written Premiums Disposal Group, Including Discontinued Operation, Gross Written Premiums Equity securities Equity Securities [Member] Cash provided by (used in) operating activities excluding reduction in collateral funds Net Cash Provided by (Used in) Operating Activities Excluding Change in Collateral Funds Net Cash Provided by (Used in) Operating Activities Excluding Change in Collateral Funds Indemnity Trust Indemnity Trust [Member] Indemnity Trust Supplemental information Supplemental Cash Flow Information [Abstract] Maturities Proceeds From Maturities From Bank Loan Participations Represents cash inflow from maturities of bank loan participations. Entity Filer Category Entity Filer Category Net earned premiums Disposal Group, Including Discontinued Operation, Premiums Earned, Net Disposal Group, Including Discontinued Operation, Premiums Earned, Net Statement [Table] Statement [Table] Other liabilities Other Liabilities Subsegments [Domain] Subsegments [Domain] Current Fiscal Year End Date Current Fiscal Year End Date Goodwill and Intangible Assets Goodwill and Intangible Assets Disclosure [Text Block] Unpaid principal balance Fair Value, Option, Loans Held as Assets, Aggregate Unpaid Principal Balance Fair Value, Option, Loans Held as Assets, Aggregate Unpaid Principal Balance Letter of credit 100 Million 2017 Facility [Member] 2017 Facility Fair Value, by Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping [Table] PRSU PRSU [Member] PRSU Issuance of Series A preferred shares (Note 12) Proceeds from Issuance of Preferred Stock and Preference Stock Preferred stock, convertible, conversion price Preferred Stock, Convertible, Conversion Price Total invested assets Investments Granted (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] U.S. Treasury securities and obligations guaranteed by the U.S. government US Treasury and Government [Member] Junior subordinated debt Junior subordinated debt Junior Subordinated Debenture Owed to Unconsolidated Subsidiary Trust Reserve For Losses And Loss Adjustment Expenses [Line Items] Reserve For Losses And Loss Adjustment Expenses [Line Items] Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Contingent Liabilities [Table] Contingent Liabilities [Table] Discloses information about contingent liabilities. Net cash provided by operating activities Net Cash Provided by (Used in) Operating Activities Class of Stock [Axis] Class of Stock [Axis] Prepaid reinsurance premiums Prepaid Reinsurance Premiums Total gains or losses (realized/unrealized)-Included in other comprehensive income Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) Other income Other Income Corporate and Other Corporate, Non-Segment [Member] Net written premiums Premiums Written, Net Income from continuing operations available to common shareholders Net Income (Loss) from Continuing Operations Available to Common Shareholders, Basic Underwriting profit (loss) of operating segments Total underwriting profit of operating segments Underwriting Profit Loss Of Operating Segments This element represents amount of underwriting Profit (loss) of operating segments. Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Equity securities, at fair value Disposal Group, Including Discontinued Operation, Equity Securities, FV-NI Disposal Group, Including Discontinued Operation, Equity Securities, FV-NI Total shareholders’ equity Balance Balance Equity, Attributable to Parent Fixed maturity securities, gross realized gains Debt Securities, Available-for-Sale, Realized Gain Consolidation Items [Axis] Consolidation Items [Axis] Liquidation preference (in dollars per share) Temporary Equity, Liquidation Preference Per Share Maturities, calls and paydowns Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements Net earned premiums Net earned premiums Premiums Earned, Net Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Gross fee income Fee Income Subsegments [Axis] Subsegments [Axis] Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] 2014 Director Plan Non Employee Director Incentive Plan 2014 [Member] Represents information regarding 2014 Non Employee Director Incentive Plan. Reinsurance recoverable on unpaid and paid losses, net Disposal Group, Including Discontinued Operation, Reinsurance Recoverable for Unpaid Claims and Claims Adjustments Disposal Group, Including Discontinued Operation, Reinsurance Recoverable for Unpaid Claims and Claims Adjustments Subsequent Events [Abstract] Subsequent Events [Abstract] Income from continuing operations before income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Assets held in trust Asset, Held-in-Trust Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Reserve for Losses and Loss Adjustment Expenses Liability For Claims And Claims Adjustment Expense [Text Block] The entire disclosure for the liability for claims and claims adjustment expense. State and municipal US States and Political Subdivisions Debt Securities [Member] Short-term investments, net Payments for (Proceeds from) Short-Term Investments Significant Other Observable Inputs Level 2 Fair Value, Inputs, Level 2 [Member] Temporary Equity [Abstract] Current year Current Year Claims and Claims Adjustment Expense Credit Rating, Standard & Poor's [Axis] Credit Rating, Standard & Poor's [Axis] Entity Emerging Growth Company Entity Emerging Growth Company Fair Value Debt Securities, Available-for-Sale, Fair Value, Fiscal Year Maturity [Abstract] Purchases – equity securities Payments to Acquire Equity Securities, FV-NI Intangible assets, net Intangible Assets, Net (Excluding Goodwill) Disposal Group Classification [Domain] Disposal Group Classification [Domain] Cash equivalent collateral trust arrangement Cash Equivalent Collateral Held In Trust Arrangement Cash Equivalent Collateral Held In Trust Arrangement Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Deferred reinsurance gain Deferred Reinsurance Gain Deferred Reinsurance Gain Broker relationships Broker Relationships [Member] Represents information related to broker relationships. Document Fiscal Period Focus Document Fiscal Period Focus Cash dividend declared (in dollars per share) Dividends Payable, Amount Per Share Life (Years) Finite-Lived Intangible Asset, Useful Life Antidilutive Securities [Axis] Antidilutive Securities [Axis] Net cash (used in) provided by discontinued operations Net Cash Provided by (Used in) Discontinued Operations Beginning of period (in dollars per share) End of period (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price Loss Portfolio Transfer Loss Portfolio Transfer [Member] Loss Portfolio Transfer Common Shares Common stock Common Stock [Member] Accounting Policies [Table] Accounting Policies [Table] Accounting Policies City Area Code City Area Code Entity Address, Postal Zip Code Entity Address, Postal Zip Code Earnings Per Share Earnings Per Share [Text Block] Associated Trust Agreement [Axis] Associated Trust Agreement [Axis] Associated Trust Agreement Ownership percentage Equity Method Investment, Ownership Percentage Losses and loss adjustment expenses Policyholder Benefits and Claims Incurred, Net, Property, Casualty and Liability Document Fiscal Year Focus Document Fiscal Year Focus Geographical [Domain] Geographical [Domain] L PT Trust LPT Trust [Member] LPT Trust Amount owed by buyer Selling Agreement, Consideration Receivable In Event Of Certain Stock Purchase Agreement Conditions Met Selling Agreement, Consideration Receivable In Event Of Certain Stock Purchase Agreement Conditions Met Retroactive reinsurance benefit recognized Retroactive Reinsurance Benefit Recognized Retroactive Reinsurance Benefit Recognized Invested assets: Investments [Abstract] Minimum Minimum [Member] Cash distributions from LLCs Proceeds from Equity Method Investment, Distribution Schedule of Option Activity Share-Based Payment Arrangement, Option, Activity [Table Text Block] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Disposal Group Classification [Axis] Disposal Group Classification [Axis] Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Total Amount Dividends, Common Stock, Cash Assets Assets [Abstract] Total incurred losses and loss and adjustment expenses Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims After ten years Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10 Goodwill and Intangible Assets Disclosure [Abstract] Goodwill and Intangible Assets Disclosure [Abstract] Payroll taxes withheld and remitted on net settlement of RSUs Payment, Tax Withholding, Share-Based Payment Arrangement Financing activities Net Cash Provided by (Used in) Financing Activities, Continuing Operations [Abstract] Liabilities: Liabilities [Abstract] Net realized and unrealized (losses) gains on investments Disposal Group, Including Discontinued Operation, Gain (Loss) On Investments Disposal Group, Including Discontinued Operation, Gain (Loss) On Investments Net cash used in financing activities Net Cash Provided by (Used in) Financing Activities Preferred stock, convertible, term Preferred Stock, Convertible, Term Preferred Stock, Convertible, Term Schedule of Assets Measured at Fair Value on a Recurring Basis Fair Value, Assets Measured on Recurring Basis [Table Text Block] Revenues: Disposal Group, Including Discontinued Operation, Revenue [Abstract] Disposal Group, Including Discontinued Operation, Revenue Contingent Liabilities Commitments and Contingencies Disclosure [Text Block] Continuing operations (in dollars per share) Income (Loss) from Continuing Operations, Per Diluted Share Reinsurance, amount remaining Reinsurance, Aggregate Coverage Limit, Amount Remaining Reinsurance, Aggregate Coverage Limit, Amount Remaining Percentage of outstanding shares Business Acquisition, Percentage of Voting Interests Acquired Retained Deficit Retained Earnings [Member] Schedule of Share Based Compensation Expense and Related Tax Benefit Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] Schedule of Underwriting Profit of Operating Segments by Individual Segment and Reconciliation to Consolidated Income Before Taxes Reconciliation of Operating Profit (Loss) from Segments to Consolidated [Table Text Block] Total liabilities, Series A redeemable preferred shares, and shareholders’ equity Liabilities and Equity Fixed maturity securities, available-for-sale, at amortized cost Total fixed maturity securities, Cost or Amortized Cost Debt Securities, Available-for-Sale, Amortized Cost Basic (in dollars per share) Earnings Per Share, Basic Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Table] Short-Duration Insurance Contracts, Reconciliation of Claims Development to Liability [Table] Other liabilities Disposal Group, Including Discontinued Operation, Other Liabilities Schedule of Long-term Debt Instruments [Table] Schedule of Long-Term Debt Instruments [Table] Accounting Policies [Abstract] Accounting Policies [Abstract] Sale of Stock [Domain] Sale of Stock [Domain] Residential mortgage-backed Residential Mortgage Backed Amortized Cost Represents Amortized Cost of Residential mortgage-backed securities. Entity Address, City or Town Entity Address, City or Town Schedule of Company's Segment Results Schedule of Segment Reporting Information, by Segment [Table Text Block] Reinsurance, aggregate coverage limit Reinsurance, Aggregate Coverage Limit Reinsurance, Aggregate Coverage Limit Investing activities Net Cash Provided by (Used in) Investing Activities, Continuing Operations [Abstract] Document Transition Report Document Transition Report Schedule of Business Acquisitions, by Acquisition [Table] Schedule of Business Acquisitions, by Acquisition [Table] Amortization of discount Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Amortization of Discount Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Amortization of Discount Restricted cash equivalents Restricted cash equivalents at beginning of period Restricted cash equivalents at end of period Restricted Cash Equivalents Common stock, shares authorized (in shares) Common Stock, Shares Authorized Expenses: Disposal Group, Including Discontinued Operation, Expenses [Abstract] Disposal Group, Including Discontinued Operation, Expenses Fixed maturity securities, available-for-sale, at fair value (amortized cost: 2024 – $1,377,965; 2023 – $1,405,136) Fixed maturity securities, available-for-sale Total investments available-for-sale, Fair Value Total fixed maturity securities, available-for-sale Debt Securities, Available-for-Sale Deduct: Loss and loss adjustment expense payments net of reinsurance: Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid [Abstract] Equity securities, gross realized gain Equity Securities, FV-NI, Realized Gain Total investments available-for-sale, Gross Unrealized Gains Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax Equity securities Net realized and unrealized gains (losses) on investments in equity securities Equity Securities, FV-NI, Gain (Loss) Other Operating Expenses and Other Expenses Other Operating Income and Expense [Text Block] Fixed maturity securities, at fair value Disposal Group, Including Discontinued Operation, Debt Securities, Available-For-Sale Disposal Group, Including Discontinued Operation, Debt Securities, Available-For-Sale Convertible Preferred Stock Convertible Preferred Stock [Member] Indefinite-lived Intangible Assets [Axis] Indefinite-Lived Intangible Assets [Axis] Entity Address, Country Entity Address, Country Reinsurance recoverable on unpaid losses, net Reinsurance Recoverable for Unpaid Claims and Claims Adjustments Commercial mortgage and asset-backed Commercial Mortgage And Asset Backed Amortized Cost Represents amortized cost of commercial mortgage and asset-backed. Amount of insurance deductible paid Payment Of Insurance Deductible Payment Of Insurance Deductible One year or less Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, Year One Number of underlying projects sold Number of Underlying Projects Sold Number of Underlying Projects Sold Common shares – 2024 and 2023: $0.0002 par value; 200,000,000 shares authorized; 37,822,340 and 37,641,563 shares issued and outstanding, respectively Common Stock, Value, Outstanding Title of Individual [Domain] Title of Individual [Domain] Investments Investment [Text Block] Limited partnerships Partnership Interest [Member] Bank loan participations, gross realized losses Bank Loan Participations, Gross Realized Loss Represents the gross realized losses on bank loan participations. Dividends payable Dividends Payable Preferred stock, convertible, floor conversion price Preferred Stock, Convertible, Floor Conversion Price Preferred Stock, Convertible, Floor Conversion Price Notes receivable two Notes Receivable Two [Member] Notes Receivable Two Net realized and unrealized gains on investments Total Net realized and unrealized gains on investments Gain (Loss) on Investments Additional paid-in capital Additional Paid in Capital Changes in fair values of short-term investments and other Short Term Investments And Other, Changes in Fair Value Short Term Investments And Other, Changes in Fair Value After five years through ten years Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 Forfeited (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value Excess and Surplus Lines Excess And Surplus Lines [Member] Represents information regarding excess and surplus lines segment. Changes in fair values of bank loan participations Bank Loan Participations, Changes in Fair Value Bank Loan Participations, Changes in Fair Value Subsequent Event Type [Axis] Subsequent Event Type [Axis] Gross written premiums Premiums Written, Gross Percentage of available for sale securities Percentage Of Available For Sale Debt Securities Represents percentage of available for sale debt securities. Forfeited (in dollars per share) Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price Income Tax Expense Income Tax, Policy [Policy Text Block] Forfeited (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeited in Period Loss Fund Trust Loss Fund Trust [Member] Loss Fund Trust Reinsurance premium Reinsurance Premium Reinsurance Premium Notes receivable one Notes Receivable One [Member] Notes Receivable One Gain on held for sale classification of discontinued operations Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax Return of capital Proceeds from Equity Method Investment, Distribution, Return of Capital Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Other assets Other Assets Entity Registrant Name Entity Registrant Name Lapsed (in dollars per share) Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Lapsed in Period, Weighted Average Exercise Price Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Lapsed in Period, Weighted Average Exercise Price Changes in fair values of equity securities Equity Securities, FV-NI, Unrealized Gain (Loss) Document Period End Date Document Period End Date Preferred stock, dividend rate, percentage Preferred Stock, Dividend Rate, Percentage Disposal Group Name [Axis] Disposal Group Name [Axis] Exercisable, end of period (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Weighted Average Exercise Price Dividend payable, record date Dividends Payable, Date of Record Corporate and Other Corporate and Other [Member] Other invested assets: Other Investments [Abstract] Entity Central Index Key Entity Central Index Key Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Dividends payable, date to be paid Dividends Payable, Date to be Paid Commercial mortgage and asset-backed Commercial Mortgage And Asset Backed Fair Value Represents fair value of commercial mortgage and asset backed. Accounting Policies Basis of Presentation and Significant Accounting Policies [Text Block] Total gains or losses (realized/unrealized)-Included in earnings Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings Series A Preferred Shares Temporary Equity Disclosure [Text Block] Temporary Equity Disclosure Share based compensation expense Share-Based Payment Arrangement, Expense Reinsurance Transaction [Axis] Reinsurance Transaction [Axis] Reinsurance Transaction Gross Carrying Amount Finite-Lived Intangible Assets, Gross Income tax expense on continuing operations Income Tax Expense (Benefit) Series A convertible preferred shares, authorized (in shares) Temporary Equity, Shares Authorized Fair Value Measurements Fair Value Disclosures [Text Block] Accounting Policies [Line Items] Accounting Policies [Line Items] Accounting Policies Net unrealized (losses) gains, net of taxes of $(2,066) in 2024 and $5,001 in 2023 Other comprehensive income (loss) Other comprehensive (loss) income Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Net cash used in operating activities of discontinued operations Cash Provided by (Used in) Operating Activities, Discontinued Operations Unearned premiums Disposal Group, Including Discontinued Operation, Unearned Premiums Disposal Group, Including Discontinued Operation, Unearned Premiums Fixed maturity securities, 12 months or more, gross unrealized losses Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss Reclassification adjustment for investment losses realized in net income Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax Debt Securities, Available-for-sale [Line Items] Debt Securities, Available-for-Sale [Line Items] Interest paid by discontinued operations Interest Paid, Discontinued Operations (Loss) income from discontinued operations (Loss) income from discontinued operations Discontinued Operation, Income (Loss) from Discontinued Operation During Phase-out Period, Net of Tax Renewable energy LLCs Renewable Energy Llcs [Member] Name of the investment category. Long-term Debt, Type [Axis] Long-Term Debt, Type [Axis] Number of trading days immediately preceding Mandatory Conversion Preferred Stock, Dividend, Trading Days Preferred Stock, Dividend, Trading Days Amendment Flag Amendment Flag Series A convertible preferred shares, outstanding (in shares) Temporary Equity, Shares Outstanding Identifiable intangible assets subject to amortization Finite-Lived Intangible Assets, Net [Abstract] Net realized investment losses Net realized investment losses on available-for-sale fixed maturities Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax Net written premiums Disposal Group, Including Discontinued Operation, Premiums Written, Net Disposal Group, Including Discontinued Operation, Premiums Written, Net Bank loan participations, gross realized gains Bank Loan Participations, Gross Realized Gain Represents the gross realized gains on bank loan participations. Fixed maturity securities, less than 12 months, gross unrealized losses Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Insurance licenses and authorities Licensing Agreements [Member] Liability for Claims and Claims Adjustment Expense [Abstract] Liability for Claims and Claims Adjustment Expense [Abstract] Interest paid Interest Paid, Excluding Capitalized Interest, Operating Activities One year or less Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, Year One Credit Facility [Domain] Credit Facility [Domain] Series A convertible preferred shares, issued (in shares) Temporary Equity, Shares Issued Liability for Unpaid Claims and Claims Adjustment Expense, Period Increase (Decrease) [Abstract] Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward] Less reclassification adjustment: OCI, Debt Securities, Available-for-Sale, Gain (Loss), before Adjustment, after Tax [Abstract] Pre close dividend, forgiveness Selling Agreement, Pre Close Dividend, Forgiveness Selling Agreement, Pre Close Dividend, Forgiveness Proceeds from sales Proceeds from Sale of Equity Method Investments Diluted (in shares) Diluted (in shares) Weighted Average Number of Shares Outstanding, Diluted Reinsurance recoverable on paid losses Reinsurance Recoverable for Paid Claims and Claims Adjustments Common stock, covenant, threshold (in dollars per share) Common Stock, Covenant Threshold, Per Share Common Stock, Covenant Threshold, Per Share Amortization of policy acquisition costs Deferred Policy Acquisition Costs, Amortization Expense Accrued expenses Accrued Liabilities Private speciality credit Private Speciality Credit [Member] Private Speciality Credit Fixed maturity securities Debt Securities, Available-for-Sale, Realized Gain (Loss) Schedule of Disposal Groups, JRG Re's Assets and Liabilities and Operating Results Disposal Groups, Including Discontinued Operations [Table Text Block] Expenses Operating Expenses [Abstract] Renewable energy notes receivable Renewable Energy Bridge Financing Notes [Member] Name of the investment category. Fixed maturity securities, gross realized losses Debt Securities, Available-for-Sale, Realized Loss Purchases of property and equipment Payments to Acquire Property, Plant, and Equipment Other operating expenses of the Corporate and Other segment Other operating expenses of the Corporate and Other segment Other Operating Expenses Of Corporate And Other Segment Represents Other operating expenses of the Corporate and Other segment. Additional Paid-in Capital Additional Paid-in Capital [Member] Sales – equity securities Proceeds from Sale of Equity Securities, FV-NI Total assets Assets Investment Income Income (Loss) from Equity Method Investments Reserve for losses and loss adjustment expenses Liability for Claims and Claims Adjustment Expense, Property-Casualty Liability Cover [Abstract] Cover [Abstract] Subsequent Events Subsequent Events [Text Block] Compensation expense under share incentive plans APIC, Share-Based Payment Arrangement, Increase for Cost Recognition UNITED STATES UNITED STATES Recurring basis Fair Value, Recurring Fair Value, Recurring [Member] Series A Preferred Stock Series A Preferred Stock [Member] Fair Value Measurement Inputs and Valuation Techniques [Line Items] Fair Value Measurement Inputs and Valuation Techniques [Line Items] 2014 LTIP Long Term Incentive Plan 2014 [Member] Represents information regarding Long Term Incentive Plan 2014. Vested (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Number of equity securities held Number Of Equity Securities Held Number Of Equity Securities Held Investment in LLC Investment In Llc [Member] Represents investment in LLC`s. Purchases Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases Segment Information Segment Reporting Disclosure [Text Block] 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] Change in cash, cash equivalents, and restricted cash equivalents Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Third-party Reinsureds Third-party Reinsureds [Member] Third-party Reinsureds Secured Debt Secured Debt [Member] Net investment income Gross Investment Income, Operating Change in restricted cash equivalents Increase (Decrease) In Restricted Cash Equivalents Increase (Decrease) In Restricted Cash Equivalents Equity Component [Domain] Equity Component [Domain] Equity securities, at cost Equity Securities, FV-NI, Cost Scenario [Axis] Scenario [Axis] Debt Instrument [Line Items] Debt Instrument [Line Items] Basic (in shares) Weighted Average Number of Shares Outstanding, Basic Entity Current Reporting Status Entity Current Reporting Status Crediting rate on funds withheld Crediting Rate On Funds Withheld Crediting Rate On Funds Withheld Payout for achievement, threshold Share-Based Compensation Arrangement by Share-Based Payment Award, Payout For Achievement, Threshold Share-Based Compensation Arrangement by Share-Based Payment Award, Payout For Achievement, Threshold Funds held Funds Held under Reinsurance Agreements, Liability Revenues Revenues [Abstract] Reserve for losses and loss adjustment expenses Disposal Group, Including Discontinued Operation, Reserve For Losses And Loss Adjustment Expenses Disposal Group, Including Discontinued Operation, Reserve For Losses And Loss Adjustment Expenses Cash paid to JRGH Payment For Selling Agreement, Pre Close Dividend Payment For Selling Agreement, Pre Close Dividend Segments [Axis] Segments [Axis] Operating activities Net Cash Provided by (Used in) Operating Activities, Continuing Operations [Abstract] Statement [Line Items] Statement [Line Items] Fair Value Estimate of Fair Value Measurement [Member] Reinsurance Transaction [Domain] Reinsurance Transaction [Domain] Reinsurance Transaction [Domain] Other comprehensive (loss) income: Other Comprehensive Income (Loss), Net of Tax [Abstract] Other Comprehensive Income (Loss), Net of Tax [Abstract] Investment in private subordinated notes Other invested assets – notes receivable Notes Receivable Represents carrying value of notes receivable as on reporting date. Scenario [Domain] Scenario [Domain] Senior debt Senior debt Long-Term Line of Credit Schedule of Gross Unrealized Losses and Fair Value for Available-for-Sale Securities Debt Securities, Available-for-Sale [Table Text Block] Cost or Amortized Cost Debt Securities, Available-for-Sale, Amortized Cost, Fiscal Year Maturity [Abstract] Total (loss) income from discontinued operations Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent