Trading Arrangements, by Individual Trading Arrangements, by Individual [Table] Weighted average shares outstanding: Weighted Average Number of Shares Outstanding, Diluted [Abstract] Trading Arrangement: Trading Arrangement [Axis] Maximum Maximum [Member] Statistical Measurement [Domain] Statistical Measurement [Domain] Ceded Ceded premiums earned Ceded Premiums Earned Title of 12(b) Security Title of 12(b) Security Ceding commission Deferred Policy Acquisition Cost, Ceding Commission Deferred Policy Acquisition Cost, Ceding Commission Document Fiscal Year Focus Document Fiscal Year Focus Adjustment to Compensation, Amount Adjustment to Compensation Amount Financial Instrument [Axis] Financial Instrument [Axis] Number of RSUs Number of PSUs Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Ryan Specialty Group Holdings, Inc. Ryan Specialty Group Holdings, Inc., Broker [Member] Ryan Specialty Group Holdings, Inc., Broker Customer [Axis] Customer [Axis] Segment Reporting [Abstract] Schedule of Investments Measured at Fair Value By Level Fair Value, Assets Measured on Recurring Basis [Table Text Block] Common stock Common Stock, Value, Issued Unearned premiums Increase (Decrease) in Unearned Premiums Exercise price (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Exercise Price Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Exercise Price Line of Credit Line of Credit [Member] Entity Ex Transition Period Entity Ex Transition Period Restatement Determination Date Restatement Determination Date Reinsurance balances payable Reinsurance Payable U.S. government and government agency US Treasury and Government [Member] Award exercise period Share-Based Compensation Arrangement by Share-Based Payment Award, Award Exercise Period Share-Based Compensation Arrangement by Share-Based Payment Award, Award Exercise Period Amendment Flag Amendment Flag Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Marketable Securities [Line Items] Marketable Securities [Line Items] Net investment income Net investment income Net Investment Income Warrant expense Warrant expense Fair Value Adjustment of Warrants Gross Unrealized Losses Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax Asset-backed securities Asset-Backed Securities [Member] Schedule of Amortized Cost and Fair Value of Fixed Maturity Securities Debt Securities, Available-for-Sale [Table Text Block] Federal Home Loan Bank Federal Home Loan Bank, Advances [Text Block] Loss Contingencies [Table] Loss Contingencies [Table] Related Party Transactions Related Party Transactions Disclosure [Text Block] Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] Entity Address, State or Province Entity Address, State or Province Total, Gross Unrealized Losses Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss Gross Unrealized Losses Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss [Abstract] PEO Total Compensation Amount PEO Total Compensation Amount Common stock, par value (in dollars per share) Common Stock, Par or Stated Value Per Share Nonvested at the beginning of the period (in shares) Nonvested at the end of the period (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number Basic (in shares) Basic weighted average shares outstanding (in shares) Weighted Average Number of Shares Outstanding, Basic Share-Based Payment Arrangement, Tranche One Share-Based Payment Arrangement, Tranche One [Member] Amortization of premium/discounts on fixed maturity securities Accretion (Amortization) of Discounts and Premiums, Investments Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount Loss Contingencies [Line Items] Loss Contingencies [Line Items] Number of reportable segments Number of Reportable Segments Deferred policy acquisition costs Increase (Decrease) in Deferred Policy Acquisition Costs Stock-based compensation expense Temporary Equity, Share-Based Payment Arrangement, Increase for Cost Recognition Temporary Equity, Share-Based Payment Arrangement, Increase for Cost Recognition Investments Investments [Abstract] Due after five years through ten years Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 CRC Insurance Services, Inc. CRC Insurance Services, Inc., Broker [Member] CRC Insurance Services, Inc., Broker Concentration Risk [Table] Concentration Risk [Table] Fixed maturities amortized cost Amortized Cost Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss Entity Address, City or Town Entity Address, City or Town Granted (in shares) Number of PSUs (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period Capital stock Federal Home Loan Bank Stock Amortized Cost Debt Securities, Available-for-Sale, Amortized Cost, Fiscal Year Maturity [Abstract] Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] Statement of Financial Position [Abstract] Award Timing MNPI Disclosure Award Timing MNPI Disclosure [Text Block] Vested (in shares) Vested (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period Basis of Presentation Basis of Accounting, Policy [Policy Text Block] Peer Group Total Shareholder Return Amount Peer Group Total Shareholder Return Amount Net incurred losses and loss adjustment expenses related to: Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims [Abstract] Level 2 Fair Value, Inputs, Level 2 [Member] Total Shareholder Return Vs Peer Group Total Shareholder Return Vs Peer Group [Text Block] Line of credit facility, maximum borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Non-Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated [Flag] Capital stock par value (in dollars per share) Federal Home Loan Bank, Advances, Par Value Concentration Risk Type [Axis] Concentration Risk Type [Axis] Investment expenses Investment Income, Investment Expense Recent Accounting Pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Use of Estimates Use of Estimates, Policy [Policy Text Block] Non-cash amortization of deferred issuance costs Amortization of Debt Issuance Costs Related and Nonrelated Parties [Axis] Related and Nonrelated Parties [Axis] Other comprehensive income (loss), net of tax Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Debt Long-Term Debt Purchase obligations due in 2029 Purchase Obligation, to be Paid, Year Three 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 Income taxes payable Increase (Decrease) in Income Taxes Payable Document Period End Date Document Period End Date Net changes in operating assets and liabilities: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Increase (Decrease) in Operating Capital [Abstract] Net cash used in investing activities Cash Provided by (Used in) Investing Activity, Including Discontinued Operation Equity Awards Adjustments, Excluding Value Reported in Compensation Table Equity Awards Adjustments, Excluding Value Reported in the Compensation Table [Member] Unrecognized tax benefits Unrecognized Tax Benefits Debt instrument, face amount Debt Instrument, Face Amount Stockholders’ Equity Equity [Text Block] Security Exchange Name Security Exchange Name Gross written premiums Premiums Written, Gross Reinsurance Recoverable Including Reinsurance Premium Paid Reinsurance Recoverable Including Reinsurance Premium Paid [Member] Due after ten years Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 10 Reinsurance balances payable Increase (Decrease) in Reinsurance Payables Issuance of common stock under stock-based compensation plan Shares Issued, Value, Share-Based Payment Arrangement, before Forfeiture Accumulated other comprehensive (loss) income Accumulated Other Comprehensive Income (Loss), Net of Tax Entity Shell Company Entity Shell Company Consolidation Items [Domain] Consolidation Items [Domain] Authorized shares for stock based compensation (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized 12 Months or Greater of Fair Value Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer Marketable Securities [Table] Marketable Securities [Table] Earnings Per Share Earnings Per Share [Text Block] Name Outstanding Recovery, Individual Name Earnings per share: Earnings Per Share [Abstract] Award Timing, How MNPI Considered Award Timing, How MNPI Considered [Text Block] Document Fiscal Period Focus Document Fiscal Period Focus Peer Group Issuers, Footnote Peer Group Issuers, Footnote [Text Block] Exercised in period (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Exercised Schedule of Revenues by Underwriting Division Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Table Text Block] Purchase obligations due in 2027 Purchase Obligation, to be Paid, Year One Total liabilities Liabilities Trading Symbol Trading Symbol Fixed maturity securities, available for sale, at fair value (amortized cost of $1,678,981 and $1,364,228, respectively) Fair Value Fair Value Total fixed maturity securities Debt Securities, Available-for-Sale, Excluding Accrued Interest Purchase of property and equipment, net Payments to Acquire Property, Plant, and Equipment 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] Pension Adjustments Prior Service Cost Pension Adjustments Prior Service Cost [Member] Number of business days Sale Of Stock, Threshold Consecutive Trading Days Sale Of Stock, Threshold Consecutive Trading Days Company Selected Measure Name Company Selected Measure Name 2025 Credit Agreement 2025 Credit Agreement [Member] 2025 Credit Agreement Fixed maturity securities Payments to Acquire Debt Securities, Available-for-Sale Income Tax Disclosure [Abstract] Bold Penguin Bold Penguin [Member] Bold Penguin Concentration Risk [Line Items] Concentration Risk [Line Items] Credit Facility [Domain] Credit Facility [Domain] Reserve for losses and loss adjustment expenses Gross reserves for losses and loss adjustment expenses, beginning of year Gross reserves for losses and loss adjustment expenses, end of period Liability for Claims and Claims Adjustment Expense Related Party Transactions [Abstract] Cash flows from operating activities: Cash Provided by (Used in) Operating Activity, Including Discontinued Operation [Abstract] Compensation Amount Outstanding Recovery Compensation Amount Individual: Individual [Axis] Warrants Warrant [Member] Diluted (in shares) Diluted weighted average shares outstanding (in shares) Weighted Average Number of Shares Outstanding, Diluted Entity Emerging Growth Company Entity Emerging Growth Company Equity Valuation Assumption Difference, Footnote Equity Valuation Assumption Difference, Footnote [Text Block] Related Party Transaction [Line Items] Related Party Transaction [Line Items] Schedule of A.M. Best Financial Strength Rating and Percent of Total Reinsurance Recoverable Ceded Credit Risk [Table Text Block] Line of Credit Facility [Table] Line of Credit Facility [Table] Underlying Security Market Price Change Underlying Security Market Price Change, Percent Schedule of Components in Net Investment Income Investment Income [Table Text Block] Stock award, vesting percentage Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] AmFam AmFam [Member] AmFam Accrued investment income Accrued Investment Income Receivable Mortgage backed securities in Amortized Cost Debt Securities, Available-for-Sale, Maturity, without Single Maturity Date, Amortized Cost Award Timing Predetermined Award Timing Predetermined [Flag] Employment taxes, penalties and interests related to the employment taxes accrued Income Tax Examination, Penalties and Interest Accrued Reinsurance recoverable on paid losses and loss adjustment expenses Reinsurance Recoverable for Paid Claims and Claims Adjustments Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, Footnote [Text Block] Net Policyholder Benefits and Claims Incurred, Net Stock-based compensation expense APIC, Share-Based Payment Arrangement, Increase for Cost Recognition Level 1 Fair Value, Inputs, Level 1 [Member] Non-operating expenses Other Nonoperating Expense Net reserves for unpaid losses and loss adjustment expenses, beginning of year Net reserves for unpaid losses and loss adjustment expenses, end of period Liability for Unpaid Claims and Claims Adjustment Expense, Net Schedules of Gross Written Premium Concentration of Risk Schedules of Concentration of Risk, by Risk Factor [Table Text Block] Effective income tax rate, percent Effective Income Tax Rate Reconciliation, Percent Dilutive awards (in shares) Incremental Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangements Nonvested at the beginning of the period (in dollars per share) Nonvested at the end of the period (in dollars per share) Grant Date Fair Value (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 All Executive Categories All Executive Categories [Member] Pension Adjustments Service Cost Pension Adjustments Service Cost [Member] Restricted assets Restricted Investments Residential mortgage-backed securities Residential Mortgage-Backed Securities [Member] Preferred stock, par value (in dollars per share) Preferred Stock, Par or Stated Value Per Share Ceded Ceded losses and loss adjustment expenses Policyholder Benefits and Claims Incurred, Ceded Vesting [Domain] Vesting [Domain] Plan Name [Domain] Plan Name [Domain] Marsh & McLennan Companies Marsh & McLennan Companies, Broker [Member] Marsh & McLennan Companies, Broker Fixed maturity securities in Amortized Cost Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Amortized Cost Concentration Risk Type [Domain] Concentration Risk Type [Domain] Net paid losses and loss adjustment expenses related to: Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid [Abstract] Schedule of Deferred Policy Acquisition Costs Deferred Policy Acquisition Costs [Table Text Block] Due in one year or less Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, Year One Income taxes receivable Increase (Decrease) in Income Taxes Receivable Schedule of Earnings Per Share, Basic and Diluted Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Fair Value Disclosures [Abstract] Debt Disclosure [Abstract] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Reinsurance recoverable, net Reinsurance recoverable, net Reinsurance Recoverable for Paid and Unpaid Claims and Claims Adjustments Additions to deferred balance Deferred Policy Acquisition Cost, Capitalization Increase percent of authorized shares for stock based compensation Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Authorized Increased Percent Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Authorized Increased Percent All other reinsurers Reinsurer, Other [Member] Segment, Geographic, and Product Line Information Segment Reporting [Text Block] Investments Investment in Debt and Equity Securities and Other Trading Assets [Text Block] Minimum Minimum [Member] Expiration Date Trading Arrangement Expiration Date Total investments Investments, Fair Value Disclosure Liabilities Liabilities [Abstract] Denominator Weighted Average Number of Shares Outstanding Reconciliation [Abstract] Fair Value Debt Securities, Available-for-Sale, Unrealized Loss Position [Abstract] Restricted cash and cash equivalents Restricted cash and cash equivalents Restricted cash and cash equivalents Restricted Cash and Cash Equivalent Non-Rule 10b5-1 Arrangement Adopted Non-Rule 10b5-1 Arrangement Adopted [Flag] Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table [Member] Net of income tax (expense) benefit Other Comprehensive Income (Loss), Available-for-Sale Securities, Tax, Portion Attributable to Parent Other liabilities Other Liabilities 7.75% Senior Notes 7.75% Senior Notes [Member] 7.75% Senior Notes Aggregate Pension Adjustments Service Cost Aggregate Pension Adjustments Service Cost [Member] Deferred Policy Acquisition Cost [Table] Deferred Policy Acquisition Cost [Table] Common stock, authorized shares (in shares) Common Stock, Shares Authorized Antidilutive Security, Excluded EPS Calculation [Table] Antidilutive Security, Excluded EPS Calculation [Table] Schedule of RSU Activity Share-Based Payment Arrangement, Restricted Stock Unit, Activity [Table Text Block] Due after ten years Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10 Exercise Price Award Exercise Price Net cash used in investing activities Cash Provided by (Used in) Investing Activity, Including Discontinued Operation [Abstract] Related Party Transaction [Axis] Related Party Transaction [Axis] Fixed maturity securities Proceeds from Sale and Maturity of Debt Securities, Available-for-Sale Document Quarterly Report Document Quarterly Report Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested [Member] Segments [Domain] Segments [Domain] State and municipal US States and Political Subdivisions Debt Securities [Member] Unrecognized tax benefits, income tax penalties and interest expense Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense Debt and Financing Arrangements Debt Disclosure [Text Block] Prior accident years Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Prior Years Unamortized deferred financing fees Debt Issuance Costs, Net Awards Close in Time to MNPI Disclosures, Table Awards Close in Time to MNPI Disclosures [Table Text Block] 2024 Plan 2024 Plan [Member] 2024 Plan Equity Component [Domain] Equity Component [Domain] Deferred policy acquisition costs Deferred policy acquisition costs, beginning of year Deferred policy acquisition costs, end of period Deferred Policy Acquisition Cost PEO Actually Paid Compensation Amount PEO Actually Paid Compensation Amount Losses and Loss Adjustment Expenses Benefits, Losses and Expenses [Abstract] Fair Value Debt Securities, Available-for-Sale, Fair Value, Fiscal Year Maturity [Abstract] Adoption Date Trading Arrangement Adoption Date Conversion price (in dollars per share) Merger, Conversion Price Per Share Merger, Conversion Price Per Share Counterparty Name [Domain] Counterparty Name [Domain] Debt instrument, interest rate, stated percentage Debt Instrument, Interest Rate, Stated Percentage Total stockholders' equity Equity beginning balance Equity ending balance Equity, Attributable to Parent Assumed Policyholder Benefits and Claims Incurred, Assumed Schedule of Valuation Assumptions Schedule of Share-Based Payment Award, Equity Instruments Other Than Options, Valuation Assumptions [Table Text Block] Schedule of Share-Based Payment Award, Equity Instruments Other Than Options, Valuation Assumptions Assets Assets [Abstract] Title Trading Arrangement, Individual Title Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount American Family Connect Property and Casualty Insurance Company American Family Connect Property and Casualty Insurance Company [Member] American Family Connect Property and Casualty Insurance Company Markel Global Reinsurance Company Markel Global Reinsurance Company [Member] Markel Global Reinsurance Company Accounting Policies [Abstract] Restatement does not require Recovery Restatement Does Not Require Recovery [Text Block] Risk-free interest rate Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Risk Free Interest Rate Earnings per share Earnings Per Share, Basic and Diluted EPS [Abstract] Earnings Per Share, Basic and Diluted EPS Insider Trading Policies and Procedures [Line Items] Insider Trading Policies and Procedures Adopted Insider Trading Policies and Procedures Adopted [Flag] Performance stock units Performance Shares [Member] Deferred income taxes Deferred Income Tax Expense (Benefit) Current accident year Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Current Year Net losses and loss adjustment expenses Liability for unpaid claims and claims adjustment expense, incurred claims, total Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims Letter of Credit Letter of Credit [Member] Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Geographical Area, Revenue and Long-Lived Asset [Line Items] Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Geographical Area, Revenue and Long-Lived Asset [Line Items] Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Compensation Actually Paid vs. Net Income Compensation Actually Paid vs. Net Income [Text Block] Number of operating segments Number of Operating Segments Antidilutive awards excluded from calculation of diluted weighted averages shares outstanding (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Number of underwriting divisions Number Of Underwriting Divisions Number Of Underwriting Divisions Restricted stock units Restricted Stock Units (RSUs) [Member] Entity Central Index Key Entity Central Index Key Written Premiums Premiums Written, Net [Abstract] All Adjustments to Compensation All Adjustments to Compensation [Member] Equity [Abstract] 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] Net cash provided by operating activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation Prior accident years Prior Year Claims and Claims Adjustment Expense Quota share agreement, percentage Quota Share Agreement, Percentage Quota Share Agreement, Percentage Income Statement [Abstract] Stockholders' equity Equity, Attributable to Parent [Abstract] Document Transition Report Document Transition Report Ownership [Axis] Ownership [Axis] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Investment, Name [Axis] Investment, Name [Axis] Expenses Operating Expenses [Abstract] Deferred tax assets, net Deferred Income Tax Assets, Net Stock Appreciation Rights (SARs) Stock Appreciation Rights (SARs) [Member] Schedule of Reinsurance Effects on Written and Earned Premiums and Losses and Loss Adjustment Expenses Effects of Reinsurance [Table Text Block] Debt instrument, basis spread on variable rate Debt Instrument, Basis Spread on Variable Rate City Area Code City Area Code Variable Rate [Domain] Variable Rate [Domain] Accumulated Other Comprehensive Income (Loss) AOCI Attributable to Parent [Member] All Individuals All Individuals [Member] Subsequent Events Subsequent Events [Text Block] Non-cash lease expense Operating Lease, Right-of-Use Asset, Periodic Reduction Name Forgone Recovery, Individual Name Baleen Specialty Baleen Specialty [Member] Baleen Specialty Weighted average remaining recognition period (in years) Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] 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] Statement [Line Items] Statement [Line Items] Total assets Assets Defined Benefit Plan [Table] Defined Benefit Plan [Table] Operating Segments Operating Segments [Member] Restricted fixed maturity securities Restricted Fixed Maturity Securities Restricted Fixed Maturity Securities Gross Unrealized Gains Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax Stock-Based Compensation Share-Based Payment Arrangement [Text Block] Mortgage-backed securities in Fair Value Debt Securities, Available-for-Sale, Maturity, without Single Maturity Date, Fair Value Other assets Increase (Decrease) in Other Operating Assets PEO PEO [Member] Compensation costs Share-Based Payment Arrangement, Expense Reinsurer Concentration Risk Reinsurer Concentration Risk [Member] Reinsurer, Name [Domain] Reinsurer, Name [Domain] Additional shares for stock based compensation (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Additional Shares Authorized Forgone Recovery due to Violation of Home Country Law, Amount Forgone Recovery due to Violation of Home Country Law, Amount Grant date fair value per share (in dollars per share) Share based Compensation Arrangement By Share based Payment Award Grant Date Fair Value Per Share Share based Compensation Arrangement By Share based Payment Award Grant Date Fair Value Per Share Credit Rating, AM Best [Axis] Credit Rating, AM Best [Axis] Total investments 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 Accrued investment income Increase (Decrease) in Accrued Investment Income Receivable Due in one year or less Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, Year One Retained Earnings Retained Earnings [Member] Operating expenses Operating Expenses Revolving Credit Facility Revolving Credit Facility [Member] 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 Fair Value Measurements Fair Value Measurement, Policy [Policy Text Block] Erroneously Awarded Compensation Recovery Erroneously Awarded Compensation Recovery [Table] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Common stock, shares outstanding (in shares) Beginning balance (in shares) Ending balance (in shares) Common Stock, Shares, Outstanding Award Timing Disclosures [Line Items] Corporate Corporate Debt Securities [Member] Diluted (in dollars per share) Earnings Per Share, Diluted Reinsurer Three Reinsurer Three [Member] Reinsurer Three Entity Current Reporting Status Entity Current Reporting Status Net cash used in financing activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Total Shareholder Return Amount Total Shareholder Return Amount Number of shares earned percent Share-Based Compensation Arrangement by Share-Based Payment Award, Number Of Shares Earned Percent Share-Based Compensation Arrangement by Share-Based Payment Award, Number Of Shares Earned Percent Common stock withheld for taxes Share-Based Payment Arrangement, Decrease for Tax Withholding Obligation Broker commission Broker Commission [Member] Broker Commission Line of Credit Facility [Line Items] Line of Credit Facility [Line Items] Ownership [Domain] Ownership [Domain] Adjustments to reconcile net income to net cash provided by operating activities: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity [Abstract] Reinsurer, Name [Axis] Reinsurer, Name [Axis] Ascot Bermuda Limited Ascot Bermuda Limited [Member] Ascot Bermuda Limited Ceded Credit Risk [Line Items] Ceded Credit Risk [Line Items] Schedule Of PSUs Earned Activity Share-Based Payment Arrangement, Performance Shares, Outstanding Activity [Table Text Block] Net written premiums Net written premiums Premiums Written, Net Share-Based Payment Arrangement [Abstract] Net cash used in financing activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract] Property and equipment, net Property, Plant, and Equipment, after Accumulated Depreciation, Depletion, and Amortization Stock-based compensation expense Equity And Temporary Equity, Share Based Payment Arrangement, Increase For Cost Recognition Equity And Temporary Equity, Share Based Payment Arrangement, Increase For Cost Recognition Financial Instruments [Domain] Financial Instruments [Domain] Prepaid reinsurance premiums Increase (Decrease) in Prepaid Reinsurance Premiums Other comprehensive (loss) income Other Comprehensive Income (Loss), Tax [Abstract] Prepaid reinsurance premiums Prepaid Reinsurance Premiums Others Other Deferred Policy Acquisition Costs [Member] Other Deferred Policy Acquisition Costs Other insurance-related income Other Income Equity Awards Adjustments, Footnote Equity Awards Adjustments, Footnote [Text Block] Underlying Securities Award Underlying Securities Amount Short-term investments Payments to Acquire Short-Term Investments Subsegments [Domain] Subsegments [Domain] Assumed Assumed Premiums Written Subsegments [Axis] Subsegments [Axis] Related Party Transaction [Table] Related Party Transaction [Table] AM Best, A Rating AM Best, A Rating [Member] Commitments and Contingencies Disclosure [Abstract] All Trading Arrangements All Trading Arrangements [Member] Less than 12 Months of Fair value Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months Other Performance Measure, Amount Other Performance Measure, Amount Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Current Fiscal Year End Date Current Fiscal Year End Date Proceeds from debt Proceeds from Issuance of Debt Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount Total net additions Total net additions Total net additions Related Party Transaction [Domain] Related Party Transaction [Domain] Issuance of common stock under stock-based compensation plan (in shares) Shares Issued, Shares, Share-Based Payment Arrangement, before Forfeiture 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] Entity File Number Entity File Number Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Schedule of Contractual Maturity of Fixed Maturity Securities Investments Classified by Contractual Maturity Date [Table Text Block] Schedule of Reconciliation of The Beginning And Ending Reserve Balances Schedule of Liability for Unpaid Claims and Claims Adjustment Expense [Table Text Block] Total mezzanine equity and stockholders' equity Mezzanine and Stockholders' Equity beginning balance Mezzanine and Stockholders' Equity ending balance Equity And Temporary Equity Attributable To Parent Equity And Temporary Equity Attributable To Parent Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Common stock, shares issued (in shares) Common Stock, Shares, Issued Measure: Measure [Axis] Net earned premiums Premiums Earned, Net Purchase obligations due in 2028 Purchase Obligation, to be Paid, Year Two 12 Months or Greater of Gross Unrealized Losses Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss Change in net unearned premiums (Increase) Decrease in Unearned Premiums, Net Equity Components [Axis] Equity Components [Axis] Product and Service [Domain] Product and Service [Domain] Related Party Related Party [Member] Entity Interactive Data Current Entity Interactive Data Current Variable Rate [Axis] Variable Rate [Axis] Effects of Reinsurance [Line Items] Effects of Reinsurance [Line Items] AM Best, A+ Rating AM Best, A+ Rating [Member] Endurance Assurance Corporation Endurance Assurance Corporation [Member] Endurance Assurance Corporation Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] 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 Entity Small Business Entity Small Business Premiums Written Gross Premiums Written Gross [Member] Premiums Written Gross Total comprehensive (loss) income Comprehensive Income (Loss), Net of Tax, Attributable to Parent Unearned premiums Unearned Premiums Termination Date Trading Arrangement Termination Date Common stock withheld for taxes (in shares) Share-Based Payment Arrangement, Shares Withheld for Tax Withholding Obligation Subsequent Events [Abstract] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Fair Value, Recurring and Nonrecurring [Table] Nature of Operations and Significant Accounting Policies Business Description and Accounting Policies [Text Block] Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total Shareholder Return [Text Block] MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] Current accident year Current Year Claims and Claims Adjustment Expense Document Type Document Type 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] Schedule of Share Based Payment Award Warrants Valuation Assumptions Schedule Of Share Based Payment Award Warrants Valuation Assumptions [Table Text Block] Schedule Of Share Based Payment Award Warrants Valuation Assumptions Fair Value as of Grant Date Award Grant Date Fair Value Schedule of Available for Sale Securities in Unrealized Loss Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value [Table Text Block] Proceeds from the sale and maturity of: Proceeds from Sale and Maturity of Debt Securities, Available-for-Sale [Abstract] Increase (Decrease) in Temporary Equity [Roll Forward] Increase (Decrease) in Temporary Equity [Roll Forward] Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Cash and cash equivalents Cash and Cash Equivalents [Member] Line of credit facility, accordion feature, increase limit Line of Credit Facility, Accordion Feature, Increase Limit Line of Credit Facility, Accordion Feature, Increase Limit Arrangement Duration Trading Arrangement Duration Deferred Policy Acquisition Cost [Line Items] Deferred Policy Acquisition Cost [Line Items] Statement of Stockholders' Equity [Abstract] Local Phone Number Local Phone Number Consolidation Items [Axis] Consolidation Items [Axis] New York Federal Reserve Bank Rate New York Federal Reserve Bank Rate [Member] New York Federal Reserve Bank Rate Entity Address, Postal Zip Code Entity Address, Postal Zip Code Entity Registrant Name Entity Registrant Name Less than 12 Months of Gross Unrealized Losses Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss Allowance for credit losses Allowance for credit losses Reinsurance Recoverable, Allowance for Credit Loss Schedule of PSU Activity Share-Based Payment Arrangement, Performance Shares, Activity [Table Text Block] Income before income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] Commitments and contingencies (Note 14) Commitments and Contingencies Total revenues Revenues Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Credit Rating, AM Best [Domain] Credit Rating, AM Best [Domain] Executive Category: Executive Category [Axis] Fixed maturity securities in Fair Value Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Fair Value Employee stock award, vesting period Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period Counterparty Name [Axis] Counterparty Name [Axis] Premiums and Reinsurance Related Information Reinsurance [Text Block] Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward] Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward] Performance stock units Beginning balance Ending balance Temporary Equity, Carrying Amount, Attributable to Parent All Award Types Award Type [Domain] Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount Fair Value Measurements Fair Value Disclosures [Text Block] Level 3 Fair Value, Inputs, Level 3 [Member] U.S. government and government agency US Government Agencies Debt Securities [Member] Healthcare Liability Healthcare Liability [Member] Healthcare Liability Expected term (in years) Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Term PEO Name PEO Name Liability for unpaid claims and claims adjustment expense, claims paid, total Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid Accrued expenses Increase (Decrease) in Accrued Liabilities AmWINS Group, Inc. AmWINS Group, Inc. Broker [Member] AmWINS Group, Inc. Broker Other assets Other Assets Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Entity Tax Identification Number Entity Tax Identification Number Interest expense and financing fees Interest Expense, Debt Related party, ownership interest Related Party, Ownership Interest Related Party, Ownership Interest Cash, cash equivalents and restricted cash, beginning of period Cash, cash equivalents and restricted cash, end of period Total cash and cash equivalents and restricted cash Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Non-NEOs Non-NEOs [Member] 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] Debt Instrument [Axis] Debt Instrument [Axis] Stock‐based compensation Share-Based Payment Arrangement, Noncash Expense Related party transaction, amounts of transaction Related Party Transaction, Amounts of Transaction Customer [Domain] Customer [Domain] Investment, Name [Domain] Investment, Name [Domain] Long-Term Debt, Type [Domain] Long-Term Debt, Type [Domain] 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 Basic (in dollars per share) Earnings Per Share, Basic Statistical Measurement [Axis] Statistical Measurement [Axis] Insider Trading Arrangements [Line Items] Award Type Award Type [Axis] Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Ceding fee Ceding Fees Ceding Fees [Member] Ceding Fees Warrant expense Adjustments to Additional Paid in Capital, Warrant Issued Change in unrealized (loss) gain on investments (net of income tax benefit (expense) of $9,964, $(1,407), $13,202, $(4,226), respectively Other Comprehensive Income (Loss), Available-for-Sale Securities Adjustment, Net of Tax, Portion Attributable to Parent Retained earnings Retained Earnings (Accumulated Deficit) Product and Service [Axis] Product and Service [Axis] Net acquisition costs Amortization of net policy acquisition costs Amortization of net policy acquisition costs Deferred Policy Acquisition Costs, Amortization Expense 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] Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Common Stock Common Stock [Member] Expected volatility Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Rate Professional Liability Professional Liability [Member] Professional Liability Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Cover [Abstract] Insurance [Abstract] Expected dividend yield Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Dividend Rate Reinsurance recoverables (percent) Concentration risk, percentage Concentration Risk, Percentage Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Axis] Taxes paid on withholding Payments (Proceeds), Tax Withholding, Share-Based Payment Arrangement Payments (Proceeds), Tax Withholding, Share-Based Payment Arrangement Equity Awards Adjustments Equity Awards Adjustments [Member] Purchase obligations due in remainder of fiscal year 2026 Purchase Obligation, to be Paid, Remainder of Fiscal Year Assumed Assumed Premiums Earned Total liabilities, mezzanine equity and stockholders' equity Liabilities and Equity Deferred Policy Acquisition Costs Deferred Policy Acquisition Costs [Text Block] Underwriting Division Underwriting Division [Member] Underwriting Division Net realized investment losses Net realized investment losses Realized Investment Gains (Losses) Employee Stock Option Share-Based Payment Arrangement, Option [Member] Ceded Credit Risk [Table] Ceded Credit Risk [Table] Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Geographical Area, Revenue and Long-Lived Asset [Table] Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Geographical Area, Revenue and Long-Lived Asset [Table] Casualty Casualty [Member] Casualty Segments [Axis] Segments [Axis] Other liabilities Increase (Decrease) in Other Operating Liabilities Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Plan Name [Axis] Plan Name [Axis] Related and Nonrelated Parties [Domain] Related and Nonrelated Parties [Domain] Premium balances receivable Increase (Decrease) in Premiums Receivable Tabular List, Table Tabular List [Table Text Block] Vesting [Axis] Vesting [Axis] Additional paid-in capital Additional Paid in Capital Reinsurance recoverable on unpaid losses, beginning of year Reinsurance recoverable on unpaid losses, end of period Reinsurance recoverable on unpaid losses and loss adjustment expenses Reinsurance Recoverable for Unpaid Claims and Claims Adjustments Reinsurance recoverable Increase (Decrease) in Reinsurance Recoverable Reserve for Losses and Loss Adjustment Expenses Liability for Future Policy Benefits and Unpaid Claims Disclosure [Text Block] Reinsurer One Reinsurer One [Member] Reinsurer One Short-term investments Short-Term Investments [Member] Name Awards Close in Time to MNPI Disclosures, Individual Name Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested [Member] Ceded written premiums Ceded Ceded written premiums Ceded Premiums Written Forfeited (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeited in Period Schedule of Restricted Assets Schedule of Restricted Assets [Table Text Block] Schedule of Restricted Assets Grant Price (in dollars per share) Sale of Stock, Price Per Share Preferred stock, authorized shares (in shares) Preferred Stock, Shares Authorized Adjustment to Compensation: Adjustment to Compensation [Axis] Reinsurer Two Reinsurer Two [Member] Reinsurer Two Commercial mortgage-backed securities Commercial Mortgage-Backed Securities [Member] Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Statement of Cash Flows [Abstract] Renaissance Reinsurance U.S. Inc Renaissance Reinsurance U.S. Inc [Member] Renaissance Reinsurance U.S. Inc Credit Facility [Axis] Credit Facility [Axis] Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Name Measure Name Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward] Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward] Income Taxes Income Tax Disclosure [Text Block] Reconciliation of restricted cash Restricted Cash Equivalent [Abstract] Pay vs Performance Disclosure [Line Items] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Reserve for losses and loss expenses Increase (Decrease) in Liability for Claims and Claims Adjustment Expense Reserve Additional Paid-in Capital Additional Paid-in Capital [Member] Entity Filer Category Entity Filer Category Total, Fair Value Debt Securities, Available-for-Sale, Unrealized Loss Position Accrued expenses Accrued Liabilities Name Trading Arrangement, Individual Name Compensation costs associated with the award unrecognized Share-Based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount Cash and cash equivalents Cash and cash equivalents Cash and Cash Equivalent Purchases of: Payments to Acquire Investments [Abstract] Concentration Risk Benchmark [Domain] Concentration Risk Benchmark [Domain] Company Selected Measure Amount Company Selected Measure Amount Income taxes receivable Income Taxes Receivable Investments, Debt and Equity Securities [Abstract] Depreciation and amortization Depreciation, Depletion and Amortization Earned Premiums Premiums Earned, Net [Abstract] Secured Overnight Financing Rate (SOFR) Secured Overnight Financing Rate (SOFR) [Member] 2024 Credit Agreement 2024 Credit Agreement [Member] 2024 Credit Agreement Gross investment income Gross Investment Income, Operating Non-PEO NEO Non-PEO NEO [Member] Senior Notes Senior Notes [Member] Entity Address, Address Line One Entity Address, Address Line One Total expenses Benefits, Losses and Expenses 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 Short-term investments Proceeds from Sale, Maturity and Collection of Short-Term Investments Income tax expense Income tax expense Income Tax Expense (Benefit) Foreign exchange losses Gain (Loss), Foreign Currency Transaction, before Tax Effect of dilutive awards: Dilutive Securities, Effect on Basic Earnings Per Share [Abstract] Customer Concentration Risk Customer Concentration Risk [Member] Award Timing Method Award Timing Method [Text Block] Net change in cash, cash equivalents and restricted cash Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Schedule of Reinsurance Recoverable on Paid and Unpaid Losses and Loss Adjustment Expenses Schedule Of Reinsurance Recoverable On Paid And Unpaid Losses And Loss Adjustment Expenses [Table Text Block] Schedule Of Reinsurance Recoverable On Paid And Unpaid Losses And Loss Adjustment Expenses Premium balances receivable Premiums Receivable, Net Net income Net income Net income Net Income (Loss) Attributable to Parent Long-Term Debt, Type [Axis] Long-Term Debt, Type [Axis] Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Ceding commission Ceding Commission [Member] Ceding Commission Statement [Table] Statement [Table] Share-Based Payment Arrangement, Tranche Two Share-Based Payment Arrangement, Tranche Two [Member] Restatement Determination Date: Restatement Determination Date [Axis] Federal Home Loan Banks [Abstract] Income taxes payable Accrued Income Taxes Revenues Revenues [Abstract] Overallotment Warrants Overallotment Warrants [Member] Overallotment Warrants Mezzanine equity Temporary Equity [Abstract] Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block] Numerator Net Income (Loss) Available to Common Stockholders, Diluted [Abstract]