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Root Reinsurance Company, Ltd. [Member] Root Reinsurance Company, Ltd. 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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] Arizona ARIZONA Schedule of Warrants Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block] Schedule of Reserve Balance Schedule of Liability for Unpaid Claims and Claims Adjustment Expense [Table Text Block] Schedule of Option Activity Share-Based Payment Arrangement, Option, Activity [Table Text Block] Weighted-Average Exercise Price Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] 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 premiums earned Net premiums earned Premiums Earned, Net Tranche One Payment Term, Tranche One [Member] Payment Term, Tranche One 12 Months or More Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss OTHER COMPREHENSIVE (LOSS) INCOME AND ACCUMULATED OTHER COMPREHENSIVE (LOSS) INCOME Comprehensive Income (Loss) Note [Text Block] Equity Components [Axis] Equity Components [Axis] Class of Stock [Line Items] Class of Stock [Line Items] California CALIFORNIA Class A Shares Class A common stock Common Class A [Member] Entity Interactive Data Current Entity Interactive Data Current Effects of Reinsurance [Line Items] Effects of Reinsurance [Line Items] Carvana Carvana [Member] Carvana 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 Fair Value Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Fair Value [Abstract] Entity Small Business Entity Small Business Comprehensive income Comprehensive Income (Loss), Net of Tax, Attributable to Parent Debt Instrument, Payment Term, Period [Domain] Debt Instrument, Payment Term, Period [Domain] Debt Instrument, Payment Term, Period [Domain] Termination Date Trading Arrangement Termination Date Federal income tax rate (as percent) Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total Shareholder Return [Text Block] Common stock—option exercises and restricted stock units vesting, net of shares withheld for employee taxes Restricted Stock, Value, Shares Issued Net of Tax Withholdings MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] Current year Current Year Claims and Claims Adjustment Expense Document Type Document Type Loss on extinguishment of debt Loss on extinguishment of debt Gain (Loss) on Extinguishment of Debt Fair Value as of Grant Date Award Grant Date Fair Value Allowance for Expected Credit Losses Debt Securities, Available-for-Sale, Allowance for Credit Loss, Excluding Accrued Interest Schedule of Unrealized Losses Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value [Table Text Block] BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Significant Accounting Policies [Text Block] Premiums payable Premiums Payable Premiums Payable Interest on fixed maturities and short-term investments Fixed Maturities and Short Term Investments [Member] Fixed Maturities and Short Term Investments Redeemable Convertible Preferred Stock Increase (Decrease) in Temporary Equity [Roll Forward] Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Interest on cash, cash equivalents, restricted cash, and restricted cash equivalents Cash and Cash Equivalents [Member] Arrangement Duration Trading Arrangement Duration Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Total intrinsic value of awards vested Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Vested Local Phone Number Local Phone Number Root Insurance Company Root Insurance Company [Member] Root Insurance Company Entity Address, Postal Zip Code Entity Address, Postal Zip Code Entity Registrant Name Entity Registrant Name Less than 12 Months Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss Income before income tax expense Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Reinsurance recoverable, net of allowance Reinsurance Recoverable, Allowance for Credit Loss Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] Commitments and Contingencies Commitments and Contingencies Total revenues Revenues Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] Accounts payable and accrued expenses Increase (Decrease) in Accounts Payable and Accrued Liabilities Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount External Credit Rating, Standard & Poor's [Domain] External Credit Rating, Standard & Poor's [Domain] Executive Category: Executive Category [Axis] Schedule of Restricted Stock Units Activity Schedule of Nonvested Restricted Stock Units Activity [Table Text Block] Vesting period Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period Counterparty Name [Axis] Counterparty Name [Axis] Liabilities, Redeemable Convertible Preferred Stock and Stockholders’ Equity Liabilities and Equity [Abstract] REINSURANCE GEOGRAPHICAL BREAKDOWN OF GROSS PREMIUMS WRITTEN Reinsurance [Text Block] Redeemable convertible preferred stock, $0.0001 par value, 100.0 shares authorized, 14.1 shares issued and outstanding at June 30, 2026 and December 31, 2025 (redemption value of $126.5) Beginning balance Ending balance Temporary Equity, Carrying Amount, Attributable to Parent Award Type [Domain] Award Type [Domain] Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount FAIR VALUE OF FINANCIAL INSTRUMENTS Fair Value Disclosures [Text Block] Level 3 Fair Value, Inputs, Level 3 [Member] Technology and development Technology And Development Expense Technology And Development Expense Accounts payable and accrued expenses Accounts Payable and Accrued Liabilities PEO Name PEO Name Geographical [Axis] Geographical [Axis] Total paid Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid Other assets Other Assets AAA Standard & Poor's, AAA Rating [Member] Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Entity Tax Identification Number Entity Tax Identification Number Common stock—option exercises and restricted stock units vesting, net of shares withheld for employee taxes (in shares) Restricted Stock, Shares Issued Net of Shares for Tax Withholdings Exercised (in dollars per share) Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Schedule of Credit Ratings Fair Value, Concentration of Risk [Table Text Block] Cash, cash equivalents, restricted cash, and restricted cash equivalents at beginning of period Cash, cash equivalents, restricted cash, and restricted cash equivalents at end of period Total cash, cash equivalents, restricted cash, and restricted cash equivalents shown in the condensed consolidated statements of cash flows Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Total grant date fair value of awards granted Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other Than Options, Grants In Period, Fair Value Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other Than Options, Grants In Period, Fair Value Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Change due to performance criteria achievement (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Change Due To Performance Achievement Criteria Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Change Due To Performance Achievement Criteria Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] Effects of Reinsurance [Table] Effects of Reinsurance [Table] 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] Ownership percentage (as percent) Equity Method Investment, Ownership Percentage Share-based compensation Share-Based Payment Arrangement, Noncash Expense Conversion of Class B to Class A common stock (in shares) Stock Issued During Period, Shares, Conversion of Convertible Securities Georgia GEORGIA Investment, Name [Domain] Investment, Name [Domain] 2027 Long-Term Debt, Maturity, Year One Long-term Debt, Type [Domain] Long-Term Debt, Type [Domain] Due five years through 10 years Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 Basic (in dollars per share) Basic (in dollars per share) Earnings Per Share, Basic Reinsurance premiums receivable, net of allowance of zero at June 30, 2026 and December 31, 2025 Reinsurance Premiums Receivable Reinsurance Premiums Receivable Repurchase and retirement of common stock Payments for Repurchase of Common Stock Statistical Measurement [Axis] Statistical Measurement [Axis] Insider Trading Arrangements [Line Items] Root Property & Casualty Insurance Company Root Property & Casualty Insurance Company [Member] Root Property & Casualty Insurance Company Award Type [Axis] Award Type [Axis] Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Accumulated loss Retained Earnings (Accumulated Deficit) Florida FLORIDA Deferred policy acquisition costs, amortization expense Deferred Policy Acquisition Costs, Amortization Expense Fair value of special deposits Regulatory Asset Requirement, Special Deposits, Fair Value Regulatory Asset Requirement, Special Deposits, Fair Value 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] Tranche 5 Share-Based Payment Arrangement, Tranche Five [Member] Share-Based Payment Arrangement, Tranche Five Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Class A and Class B Convertible Common Stock Common Stock [Member] Fair Value Measurement [Domain] Fair Value Measurement [Domain] Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Cover [Abstract] Reclassification Reclassification, Comparability Adjustment [Policy Text Block] Insurance [Abstract] A+, A, A- Standard & Poor's, A Plus, A, A Minus Rating [Member] Standard & Poor's, A Plus, A, A Minus Rating % of Total Fair Value % of Total Concentration Risk, Percentage Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Axis] Colorado COLORADO Equity Awards Adjustments Equity Awards Adjustments [Member] Assumed Assumed Premiums Earned Net realized gains on investments Debt Securities, Available-for-Sale, Realized Gain (Loss) Total liabilities, redeemable convertible preferred stock and stockholders’ equity Liabilities and Equity Tranche 4 Share-Based Payment Arrangement, Tranche Four [Member] Share-Based Payment Arrangement, Tranche Four Net realized gains on investments Realized Investment Gains (Losses) Stock options Employee Stock Option Share-Based Payment Arrangement, Option [Member] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Other liabilities Increase (Decrease) in Other Operating Liabilities Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Plan Name [Axis] Plan Name [Axis] Premiums 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 Plus reinsurance recoverable on unpaid losses Reinsurance Recoverable for Unpaid Claims and Claims Adjustments Reinsurance recoverable Increase (Decrease) in Reinsurance Recoverable Short-term investments Short-Term Investments [Member] Name Awards Close in Time to MNPI Disclosures, Individual Name Amortized cost, short term investments Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss, Current 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] Outstanding, aggregate intrinsic value Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Intrinsic Value Ceded Ceded Premiums Written Forfeited, expired or canceled (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeited in Period General and administrative General and Administrative Expense Conversion of Class B to Class A common stock Stock Issued During Period, Value, Conversion of Convertible Securities Preferred stock, shares authorized (in shares) Preferred Stock, Shares Authorized BBB+, BBB, BBB- Standard & Poor's, BBB Plus, BBB, BBB Minus Rating [Member] Standard & Poor's, BBB Plus, BBB, BBB Minus Rating Adjustment to Compensation: Adjustment to Compensation [Axis] Class of Stock [Domain] Class of Stock [Domain] Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Premiums payable Increase (Decrease) In Premiums Payables Increase (Decrease) In Premiums Payables Short-term investments (amortized cost: $10.8 and zero at June 30, 2026 and December 31, 2025, respectively) Debt Securities, Available-for-Sale, Excluding Accrued Interest, Current Net income attributable to participating securities Less: Undistributed income allocated to participating securities Undistributed Earnings (Loss) Allocated to Participating Securities, Basic Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Total assets at fair value Assets, Fair Value Disclosure Investments Investment, Policy [Policy Text Block] Short-term investments Debt Securities Available For Sale Current [Member] Debt Securities Available For Sale Current 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] Pay vs Performance Disclosure [Line Items] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Allowance for reinsurance premiums Reinsurance Premiums Receivable, Allowance For Credit Loss Reinsurance Premiums Receivable, Allowance For Credit Loss Debt Instrument [Line Items] Debt Instrument [Line Items] Realized gains (losses) on investments Gain (Loss) on Sale of Other Investments Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Losses and loss adjustment expenses reserves 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 Debt Securities, Available-for-Sale, Unrealized Loss Position Capitalization of internally developed software Payments to Develop Software Name Trading Arrangement, Individual Name Restricted cash equivalents Restricted Cash And Cash Equivalents, Fair Value Disclosure Restricted Cash And Cash Equivalents, Fair Value Disclosure Cash and cash equivalents Cash and cash equivalents Cash and Cash Equivalent Concentration Risk Benchmark [Domain] Concentration Risk Benchmark [Domain] Company Selected Measure Amount Company Selected Measure Amount Investments, Debt and Equity Securities [Abstract] Premiums earned: Premiums Earned, Net [Abstract] Entity Address, Address Line Two Entity Address, Address Line Two Stock, Class of Stock [Table] Stock, Class of Stock [Table] Preferred stock, redemption amount Preferred Stock, Redemption Amount Total Gross Investment Income, Operating Short Term Warrant Short Term Warrant [Member] Short Term Warrant Unearned premiums Unearned Premiums, Gross Unearned Premiums, Gross Non-PEO NEO Non-PEO NEO [Member] Entity Address, Address Line One Entity Address, Address Line One 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 Income tax expense Income Tax Expense (Benefit) Effect of dilutive securities: Dilutive Securities, Effect on Basic Earnings Per Share [Abstract] Award Timing Method Award Timing Method [Text Block] Basis of Consolidation Consolidation, Policy [Policy Text Block] Net (decrease) increase in cash, cash equivalents, restricted cash, and restricted cash equivalents 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] Premiums receivable, net of allowance of $8.5 and $8.9 at June 30, 2026 and December 31, 2025, respectively Premiums Receivable, Net AOCI Attributable to Parent, Net of Tax [Roll Forward] AOCI Attributable to Parent, Net of Tax [Roll Forward] Tranche 3 Share-Based Payment Arrangement, Tranche Three [Member] 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] Statement [Table] Statement [Table] Tranche 2 Share-Based Payment Arrangement, Tranche Two [Member] Redeemable convertible preferred stock Redeemable Convertible Preferred Stock [Member] Restatement Determination Date: Restatement Determination Date [Axis] Proceeds from exercise of stock options and restricted stock units Proceeds from Stock Options Exercised Schedule of Changes in Accumulated Other Comprehensive (Loss) Income Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table] Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table] Credit Rating, Standard & Poor's [Axis] Credit Rating, Standard & Poor's [Axis] Loss and loss adjustment expense reserves Gross loss and LAE reserves, January 1 Gross loss and LAE reserves, June 30 Liability For Claims And Claims Adjustment Expense, Gross Liability For Claims And Claims Adjustment Expense, Gross Reinsurance premiums receivable Increase (Decrease) In Reinsurance Premiums Receivable Increase (Decrease) In Reinsurance Premiums Receivable Revenues: Revenues [Abstract] Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block] Numerator: Net Income (Loss) Available to Common Stockholders, Diluted [Abstract]