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[Policy Text Block] Rate Effective Income Tax Rate Reconciliation, Percent [Abstract] Other non-current assets Investments and Other Noncurrent Assets Watkins Watkins [Member] Watkins Proceeds from other sales of investments in unconsolidated affiliates, equity securities and other long- term investments Proceeds from Sale of Other Investments Equity investment Payments to Acquire Equity Method Investments Dividends declared Dividends, Common Stock, Cash Total Cannae shareholders' equity Equity, Attributable to Parent Debt Securities, Available-for-sale [Table] Debt Securities, Available-for-Sale [Table] Other comprehensive (loss) earnings, net of tax: Other Comprehensive Income (Loss), Net of Tax [Abstract] Insider Trading Policies and Procedures [Line Items] Clearlake Capital Group, L.P Clearlake Capital Group, L.P [Member] Clearlake Capital Group, L.P Schedule of Property and Equipment Property, Plant and Equipment [Table Text Block] Common stock, shares authorized (in shares) 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Assets Valuation Allowance, Amount Proceeds from sales of Dayforce shares Proceeds From Sale Of Equity Method Investments, One Proceeds From Sale Of Equity Method Investments, One Retained Earnings Retained Earnings [Member] Sale of stock permitted up to (in shares) Voting And Support Agreement, Number Of Owned Shares Of Equity Investment Permitted to Sell Prior To Close Or Termination Of Merger Agreement Voting And Support Agreement, Number Of Owned Shares Of Equity Investment Permitted to Sell Prior To Close Or Termination Of Merger Agreement Income Tax Jurisdiction [Axis] Income Tax Jurisdiction [Axis] Additional Payment-AUM threshold As Of December 2028 Achievement Additional Payment-AUM threshold As Of December 2028 Achievement [Member] Additional Payment-AUM threshold As Of December 2028 Achievement Entity Address, Postal Zip Code Entity Address, Postal Zip Code Restatement Determination Date Restatement Determination Date Cash and cash equivalents at beginning of period Cash and 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Tax Other Comprehensive Income Loss Reclassification Adjustment For Net Unrealized Gains Losses On Unconsolidated Affiliates, Net Of Tax, Include Net Earnings. Tax Variable Interest Entities Variable Interest Entity Disclosure [Text Block] Other Performance Measure, Amount Other Performance Measure, Amount Entity Address, State or Province Entity Address, State or Province Net loss from discontinued operations attributable to Cannae Holdings, Inc. common shareholders Net Income (Loss) from Discontinued Operations Available to Common Shareholders, Basic Lease asset impairment Operating Lease, Impairment Loss Non-current assets of discontinued operations - see Note Q Disposal Group, Including Discontinued Operation, Assets, Noncurrent Net loss from discontinued operations - see note Q Income (Loss) From Equity Method Investment, Discontinued Operations Income (Loss) From Equity Method Investment, Discontinued Operations Related Party [Domain] Related and Nonrelated Parties [Domain] Total current liabilities Current liabilities Liabilities, Current Tax Income Tax Expense (Benefit), Effective Income Tax Rate Reconciliation, Amount [Abstract] Non-deductible executive compensation Effective Income Tax Rate Reconciliation, Nondeductible Expense, Executive Compensation, Percent Effective Income Tax Rate Reconciliation, Nondeductible Expense, Executive Compensation, Percent Net (losses) gains recognized during the period on equity securities Equity Securities, FV-NI, Gain (Loss) Derivative Instrument [Axis] Derivative Instrument [Axis] CSI CSI [Member] CSI Issuance of restricted stock (in shares) Stock Issued During Period, Shares, Restricted Stock Award, Gross Individual: Individual [Axis] Fair Value of Financial Instruments Fair Value of Financial Instruments, Policy [Policy Text Block] 2029 Recorded Unconditional Purchase Obligation, to be Paid, Year Four Liabilities: Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] Income Tax Jurisdiction [Domain] Income Tax Jurisdiction [Domain] Dividend paid Payments of Ordinary Dividends, Common Stock Other current assets Other Assets, Current Document Annual Report Document Annual Report WineDirect Inc WineDirect Inc [Member] WineDirect Inc MSA Termination Agreement second installment of unpaid termination fees (as defined in the MSA) Management Services Agreement, Termination Agreement, Second Annual Installment Of Termination Fee, Amount Management Services Agreement, Termination Agreement, Second Annual Installment Of Termination Fee, Amount Entity [Domain] Entity [Domain] Net cash provided by investing activities Cash Provided by (Used in) Investing Activity, Including Discontinued Operation Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table [Member] Interest Interest Paid, Excluding Capitalized Interest, Operating Activity Document Fiscal Year Focus Document Fiscal Year Focus Maximum Exposure Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount Basis of Presentation Basis of Accounting, Policy [Policy Text Block] Lease assets Operating Lease, Right-of-Use Asset Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Debt service payments Repayments of Long-Term Debt Effective tax rate Effective Income Tax Rate Reconciliation, Percent Entity Interactive Data Current Entity Interactive Data Current FNF Revolver Corporate Revolver Note Corporate Revolver Note [Member] Corporate Revolver Note [Member] Operating lease cost Operating Lease, Cost Computer software Software Computer Software, Intangible Asset [Member] Equity Method Investment, Nonconsolidated Investee [Axis] Equity Method Investment, Nonconsolidated Investee [Axis] Weighted average period Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition Total accounts payable and other accrued liabilities, current Accounts Payable and Accrued Liabilities, Fair Value Disclosure Less: valuation allowance Deferred Tax Assets, Valuation Allowance Terminated Amended Management Services Agreement Termination Fees Installment That Would Be Due Under The MSA July 1 2025 Terminated Amended Management Services Agreement Termination Fees Installment That Would Be Due Under The MSA July 1 2025 [Member] Terminated Amended Management Services Agreement Termination Fees Installment That Would Be Due Under The MSA July 1 2025 Revenue Recognition Revenue from Contract with Customer [Policy Text Block] Equity in Fulfillment received as consideration in the WD Transaction Consideration Received for Beneficial Interest Obtained for Transferring Financial Asset Buildings Building [Member] Segment Information Segment Reporting Disclosure [Text Block] Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] 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] Net operating loss carryforwards Deferred Tax Assets, Operating Loss Carryforwards Long-Lived Tangible Asset [Axis] Long-Lived Tangible Asset [Axis] Other Commitments [Line Items] Other Commitments [Line Items] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Finite-Lived Intangible Assets [Line Items] Finite-Lived Intangible Assets [Line Items] Ownership [Domain] Ownership [Domain] Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total Shareholder Return [Text Block] Equity investments Effective Income Tax Rate Reconciliation, Equity Investments, Percent Effective Income Tax Rate Reconciliation, Equity Investments, Percent Fair Value, Recurring and Nonrecurring [Table] Fair Value, Recurring and Nonrecurring [Table] Amortization expense for amortizable intangible assets Amortization of Intangible Assets Leases Lessee, Leases [Policy Text Block] Goodwill Goodwill and Intangible Assets, Goodwill, Policy [Policy Text Block] Deferred tax assets Deferred Income Tax Assets, Net Additions to property and equipment and other intangible assets Payments to Acquire Productive Assets Alight Alight, Inc. [Member] Alight, Inc. MSA Termination Agreement, monthly installment of management fees payable, amount Management Services Agreement, Termination Agreement , Monthly Installment Of Management Fees Payable, Amount Management Services Agreement, Termination Agreement , Monthly Installment Of Management Fees Payable, Amount Net loss from continuing operations attributable to Cannae Holdings, Inc. common shareholders Net Income (Loss) from Continuing Operations Available to Common Shareholders, Basic Depreciation and amortization Depreciation and amortization Depreciation, Depletion and Amortization Other assets Other Assets, Noncurrent Entity Central Index Key Entity Central Index Key PEO Name PEO Name Total revenues Total revenues Revenues Schedule of Gross Principal Maturities of Notes Payable Schedule of Maturities of Long-Term Debt [Table Text Block] Proceeds from sale of stock Sale of Stock, Consideration Received on Transaction 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] Supplemental Cash Flow Elements [Abstract] Supplemental Cash Flow Elements [Abstract] Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount Revolving Credit Facility Revolver Note Revolving Credit Facility [Member] Trade Receivables Accounts Receivable [Policy Text Block] Arrangement Duration Trading Arrangement Duration Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Deferred revenue Contract with Customer, Liability, Current Segments [Axis] Segments [Axis] Exercise Price Award Exercise Price Entity Filer Category Entity Filer Category Class of Stock [Domain] Class of Stock [Domain] Amounts attributable to Cannae Holdings, Inc. common shareholders Income Amounts Attributable to Parent, Disclosures [Abstract] Local Phone Number Local Phone Number Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Federal statutory rate Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent Number of restaurants Number of Restaurants Thereafter Long-Term Debt, Maturity, after Year Five Subsequent Event Type [Axis] Subsequent Event Type [Axis] Equity investments Deferred Tax Assets, Equity Method Investments Management Fee Expense Payable Management Fee Expense Payable [Member] Management Fee Expense Payable Other operating revenue Other revenues Other Operating Revenue [Member] Other Operating Revenue ASSETS Assets [Abstract] Notes payable, long-term Notes payable, long-term Long-Term Debt, Excluding Current Maturities Credit Facility [Axis] Credit Facility [Axis] 2025 Repurchase Program 2025 Repurchase Program [Member] 2025 Repurchase Program Underlying Security Market Price Change Underlying Security Market Price Change, Percent Estimated amortization expense, 2028 Finite-Lived Intangible Asset, Expected Amortization, Year Three Other Commitments [Axis] Other Commitments [Axis] Debt Instrument [Axis] Debt Instrument [Axis] Fair Value Measurements Fair Value Disclosures [Text Block] Credit Facility [Domain] Credit Facility [Domain] Amortizable intangible assets, gross Finite-Lived Intangible Assets, Gross 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] Entity Address, Address Line One Entity Address, Address Line One Treasury stock repurchases Stock repurchases Treasury Stock, Value, Acquired, Cost Method Accumulated Other Comp (Loss) Earnings AOCI Attributable to Parent [Member] Interest rate incurred (as a percent) Notes receivable, interest rate Debt Instrument, Interest Rate, Stated Percentage Investment, Name [Axis] Investment, Name [Axis] RSU vesting and payment for shares withheld for taxes and in treasury (in shares) Share-Based Payment Arrangement, Shares Withheld for Tax Withholding Obligation Lease liabilities, long-term Operating lease liability as of December 31, 2025, long-term Operating Lease, Liability, Noncurrent Entity Voluntary Filers Entity Voluntary Filers CNNE Cannae Holdings Inc. [Member] Cannae Holdings Inc. 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