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Groupings [Abstract] Current assets: Assets, Current [Abstract] Total liabilities and equity Liabilities and Equity Schedule of Purchase Obligations Recorded Unconditional Purchase Obligations [Table Text Block] Additional ownership percentage Equity Method Investment Ownership Additional Percentage Acquired Equity Method Investment Ownership Additional Percentage Acquired Amended MSA Amended Management Services Agreement [Member] Amended Management Services Agreement LIABILITIES AND EQUITY Liabilities and Equity [Abstract] Cover [Abstract] Cover [Abstract] Cash and cash equivalents Cash and Cash Equivalents, Fair Value Disclosure Discontinued Operations Disposal Groups, Including Discontinued Operations, Disclosure [Text Block] Maximum Maximum [Member] Equity Method Investment [Table] Equity Method Investment [Table] Less: Net loss attributable to noncontrolling interests Net loss attributable to noncontrolling interests Losses of unconsolidated affiliates Net Income (Loss) Attributable to Noncontrolling Interest Unrealized earnings (loss) of investments in unconsolidated affiliates, tax expense (benefit) OCI, Equity Method Investment, Tax Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount Debt Instrument [Line Items] Debt Instrument [Line Items] Purchases of other long-term investments Payments to Acquire Other Investments Treasury Stock Treasury Stock, Common [Member] Net loss from continuing operations Net (loss) earnings from continuing operations Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] Pay vs Performance Disclosure [Line Items] Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount Proceeds from sale of investment securities and other investments in 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Combination [Domain] Business Combination [Domain] Related Party Related Party [Member] Recognized gains (losses), net Recognized gain Nonoperating Gains (Losses) Investments in unconsolidated affiliates Equity Method Investments [Member] Common stock outstanding (in shares) Beginning balance, Common Stock (in shares) Ending balance, Common Stock (in shares) Common Stock, Shares, Outstanding Common stock held as collateral for credit facility (in shares) Common Stock Held As Collateral for Credit Facility, Shares Common Stock Held As Collateral for Credit Facility, Shares PEO PEO [Member] Schedule of Disaggregation of Revenue Disaggregation of Revenue [Table Text Block] BKFC Black Knight Football and Entertainment LP [Member] Black Knight Football and Entertainment LP Non-cash investing and financing activities: Noncash Investing and Financing Items [Abstract] (Loss) earnings before income taxes and equity in earnings (losses) of unconsolidated affiliates Income (Loss) from Continuing 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Group, Including Discontinued Operation, Assets, Noncurrent Related Party [Domain] Related and Nonrelated Parties [Domain] Total current liabilities Liabilities, Current Net gains (losses) recognized during the period on equity securities Equity Securities, FV-NI, Gain (Loss) Derivative Instrument [Axis] Derivative Instrument [Axis] Individual: Individual [Axis] 2029 Recorded Unconditional Purchase Obligation, to be Paid, Year Four Liabilities: Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] Dividends paid Payments of Ordinary Dividends, Common Stock Other current assets Other Assets, Current 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 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[Member] Alight, Inc. Ownership [Domain] Ownership [Domain] 99 Restaurants Ninety-Nine Restaurants [Member] Ninety-Nine Restaurants [Member] Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total Shareholder Return [Text Block] Initial Payment-AUM threshold from September 2026 through December 2028 Achievement Initial Payment-AUM threshold from September 2026 through December 2028 Achievement [Member] Initial Payment-AUM threshold from September 2026 through December 2028 Achievement Fair Value, Recurring and Nonrecurring [Table] Fair Value, Recurring and Nonrecurring [Table] Contingent consideration for investment in JANA Non Cash, Contingent Consideration Liability For Investment Non Cash, Contingent Consideration Liability For Investment Deferred tax asset Deferred Income Tax Assets, Net Additions to property and equipment and other intangible assets Payments to Acquire Productive Assets Net loss from continuing operations attributable to Cannae Holdings, Inc. common 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Credit Facility Revolving Credit Facility [Member] Investment in JANA paid through reissuance of common stock from treasury Noncash Or Part Noncash Investment, Common Stock Re-Issued From Treasury, Consideration Paid Noncash Or Part Noncash Investment, Common Stock Re-Issued From Treasury, Consideration Paid 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] Number of restaurants Number of Restaurants Subsequent Event Type [Axis] Subsequent Event Type [Axis] ASSETS Assets [Abstract] Notes payable, long-term Notes payable, long term Long-Term Debt, Excluding Current Maturities Credit Facility [Axis] Credit Facility [Axis] Underlying Security Market Price Change Underlying Security Market Price Change, Percent 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] 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 Thereafter Recorded Unconditional Purchase Obligation, to be Paid, After Year Four Recorded Unconditional Purchase Obligation, to be Paid, After Year Four Treasury stock repurchases Stock repurchases cost Treasury Stock, Value, Acquired, Cost Method Accumulated Other Comp (Loss) Earnings AOCI Attributable to Parent [Member] Interest rate incurred Debt Instrument, Interest Rate, Stated Percentage Investment, Name [Axis] Investment, Name [Axis] 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, Noncurrent CSI CSI [Member] CSI Ownership [Axis] Ownership [Axis] 2025 Repurchase Program 2025 Repurchase Program [Member] 2025 Repurchase Program 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] Fair Value as of Grant Date Award Grant Date Fair Value Trade receivables, net Accounts Receivable, after Allowance for Credit Loss Entity Registrant Name Entity Registrant Name Stock Price or TSR Estimation 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Shareholder Return Amount Restatement Determination Date: Restatement Determination Date [Axis] Non-PEO NEO Non-PEO NEO [Member] 2027 Recorded Unconditional Purchase Obligation, to be Paid, Year Two Other activity in non-controlling interests Proceeds from (Payment for) Other Financing Activity Name Trading Arrangement, Individual Name All Award Types Award Type [Domain] Noncontrolling interests Equity, Attributable to Noncontrolling Interest Equity Awards Adjustments Equity Awards Adjustments [Member] Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block] Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Compensation Amount Outstanding Recovery Compensation Amount Temporary Equity, by Class of Stock [Table] Temporary Equity, by Class of Stock [Table] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Condensed Consolidated Statements of Comprehensive Earnings Statement of Comprehensive Income [Abstract] Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Revenue recognized that was included in deferred revenue Contract with Customer, Liability, Revenue Recognized Share Repurchase Program [Axis] Share Repurchase Program [Axis] Income tax expense (benefit) Discontinued Operation, Tax Effect of Discontinued Operation Number of tranches Number Of Contingent Consideration Tranches Number Of Contingent Consideration Tranches MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] Name Awards Close in Time to MNPI Disclosures, Individual Name WineDirect Inc WineDirect Inc [Member] WineDirect Inc Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] Accounts payable, accrued liabilities, deferred revenue and other liabilities Increase (Decrease) In Accounts Payable, Accrued Liabilities, Contract Liabilities, And Other Operating Liabilities Increase (Decrease) In Accounts Payable, Accrued Liabilities, Contract Liabilities, And Other Operating Liabilities Settlement amount Option Contract Indexed to Equity, Settlement, Cash, Amount Revenues: Revenues [Abstract] Stock-based compensation APIC, Share-Based Payment Arrangement, Increase for Cost Recognition Less: Treasury stock, 43,224,192 and 31,538,780 shares as of September 30, 2025 and December 31, 2024, respectively, at cost Treasury Stock, Value Accumulated other comprehensive income (loss) Accumulated Other Comprehensive Income (Loss), Net of Tax 2026 Long-Term Debt, Maturity, Year One Segments [Domain] Segments [Domain] Short-term investments Short-term Investments At Fair Value Short-term Investments At Fair Value Available borrowing capacity Line of Credit Facility, Remaining Borrowing Capacity Shares subject to possible redemption (in shares) Option Indexed to Issuer's Equity, Indexed Shares Aggregate Pension Adjustments Service Cost Aggregate Pension Adjustments Service Cost [Member] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Minimum Minimum [Member] Earnings Per Share Earnings Per Share, Policy [Policy Text Block] Company Selected Measure Name Company Selected Measure Name Notes Payable Debt Disclosure [Text Block] Preferred stock, 0.0001 par value; authorized 10,000,000 shares; none issued and outstanding as of September 30, 2025 and December 31, 2024 Preferred Stock, Value, Issued Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Issuance of restricted stock and shares held in trust (in shares) Stock Issued During Period, Shares, Restricted Stock Units, Gross And Employee StockTrust Stock Issued During Period, Shares, Restricted Stock Units, Gross And Employee Stock Trust Stock Appreciation Rights (SARs) Stock Appreciation Rights (SARs) [Member] All Executive Categories All Executive Categories [Member] Cannae common stock, 0.0001 par value; authorized 115,000,000 shares as of September 30, 2025 and December 31, 2024; issued of 94,802,328 and 94,328,322 shares as of September 30, 2025 and December 31, 2024, respectively, and outstanding of 51,578,136 and 62,789,542 shares as of September 30, 2025 and December 31, 2024, respectively (excluding the 2,413,357 shares subject to possible redemption) Common Stock, Value, Issued DSA, term Director Services Agreement, Term Director Services Agreement, Term Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Title and Position [Axis] Title and Position [Axis] Weighted average shares outstanding Cannae Holdings common stock, diluted basis (in shares) Weighted Average Number of Shares Outstanding, Diluted Commitments and contingencies - see Note H Commitments and Contingencies Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] Business Combination [Axis] Business Combination [Axis] Comprehensive loss Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Entity Small Business Entity Small Business Watkins Watkins [Member] Watkins Other operating expenses Other Cost and Expense, Operating Non-controlling Interests Noncontrolling Interest [Member] Preferred stock outstanding (in shares) Preferred Stock, Shares Outstanding JANA JANA [Member] JANA Document Transition Report Document Transition Report Ownership percentage Equity Method Investment, Ownership Percentage Underlying Securities Award Underlying Securities Amount Equity Component [Domain] Equity Component [Domain] Document Period End Date Document Period End Date PEO Actually Paid Compensation Amount PEO Actually Paid Compensation Amount Diluted Earnings Per Share, Diluted [Abstract] Awards Close in Time to MNPI Disclosures, Table Awards Close in Time to MNPI Disclosures [Table Text Block] Revenue from Contract with Customer [Abstract] Revenue from Contract with Customer [Abstract] Recognized losses and asset impairments, net Gain (Loss) on Sale of Assets and Asset Impairment Charges Total equity Beginning balance Ending balance Equity, Including Portion Attributable to Noncontrolling Interest Stock repurchase, average price per share (in usd per share) Shares Acquired, Average Cost Per Share Document Type Document Type Level 3 Fair Value, Inputs, Level 3 [Member] Name Outstanding Recovery, Individual Name Additional paid-in capital Additional Paid in Capital Product and Service [Axis] Product and Service [Axis] Derivative Contract [Domain] Derivative Contract [Domain] Total operating revenues Total revenues Total operating revenues Revenue from Contract with Customer, Excluding Assessed Tax All Individuals All Individuals [Member] Long-term Debt, Type [Domain] Long-Term Debt, Type [Domain] Thereafter Long-Term Debt, Maturity, after Year Four Long-Term Debt, Maturity, after Year Four Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] Name Forgone Recovery, Individual Name Total current assets Assets, Current Statistical Measurement [Axis] Statistical Measurement [Axis] 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] Disposal Group Classification [Axis] Disposal Group Classification [Axis] Stock repurchase program, authorized amount (up to) Share Repurchase Program, Authorized, Amount Lease liabilities Increase (Decrease) In Lease Liabilities Increase (Decrease) In Lease Liabilities Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Disposal Group Name [Axis] Disposal Group Name [Axis] Payment for vested shares withheld for taxes and in treasury Payment, Tax Withholding, Share-Based Payment Arrangement Potential future payments Equity Method Investment, Contingent Consideration Equity Method Investment, Contingent Consideration Peer Group Issuers, Footnote Peer Group Issuers, Footnote [Text Block] Short-term investments Other Short-Term Investments Net loss attributable to Cannae Holdings, Inc. common shareholders Net loss attributable to Alight Net Income (Loss) Available to Common Stockholders, Basic Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Loss from discontinued operations before income taxes Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax Share Repurchase Program [Domain] Share Repurchase Program [Domain] Current liabilities: Liabilities, Current [Abstract] Line of Credit Facility [Line Items] Line of Credit Facility [Line Items] Guarantor Obligations, Nature [Domain] Guarantor Obligations, Nature [Domain] Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] O'Charley's O'Charley's [Member] O'Charley's Share price (in usd per share) Business Combination, Price Per Share Line of credit outstanding balance Long-Term Line of Credit Level 1 Fair Value, Inputs, Level 1 [Member] Unrealized earnings (loss) of investments in unconsolidated affiliates Other comprehensive earnings (loss) — unrealized gains and losses of investments in unconsolidated affiliates, net of tax OCI, Equity Method Investment, after Tax Related Party Transaction [Table] Related Party Transaction [Table] Net loss per share (in usd per share) Earnings Per Share, Diluted Erroneously Awarded Compensation Recovery Erroneously Awarded Compensation Recovery [Table] Title of 12(b) Security Title of 12(b) Security Disposal Groups, Including Discontinued Operations [Table] Disposal Groups, Including Discontinued Operations [Table] Employment agreement, lump-sum payment Employment Agreement, Lump-sum Payment, Amount Employment Agreement, Lump-sum Payment, Amount FNF Revolver Corporate Revolver Note [Member] Corporate Revolver Note [Member] Sale of stock (in shares) Sale of Stock, Number of Shares Issued in Transaction Treasury shares (in shares) Beginning balance, Treasury Stock (in shares) Ending balance, Treasury Stock (in shares) Treasury Stock, Common, Shares Earnings per share Earnings Per Share [Abstract] Termination Fees Expense Termination Fees Expenses [Member] Termination Fees Expenses Consolidation Items [Domain] Consolidation Items [Domain] Total other income (expense) Nonoperating Income (Expense) Parent ownership percentage Subsidiary, Ownership Percentage, Parent Distributions from investments in unconsolidated affiliates Proceeds from WD transaction Proceeds from Equity Method Investment, Distribution, Return of Capital Investments, Debt and Equity Securities [Abstract] Investments, Debt and Equity Securities [Abstract] Net loss from discontinued operations, net of tax - see Note J Net (loss) earnings from discontinued operations Net loss from discontinued operations, net of tax Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest Variable Interest Entity, Not Primary Beneficiary Variable Interest Entity, Not Primary Beneficiary [Member] Option Indexed to Issuer's Equity [Axis] Option Indexed to Issuer's Equity [Axis] Gross profit Gross Profit Net loss from discontinued operations - see Note J Income (Loss) From Equity Method Investment, Discontinued Operations Income (Loss) From Equity Method Investment, Discontinued Operations Other activity in non-controlling interests Stockholders' Equity, Other Equity securities, at fair value Equity securities Equity Securities, FV-NI, Noncurrent MSA Termination Agreement , aggregate remaining unpaid monthly management fees Management Services Agreement, Termination Agreement , Final Installment Of Unpaid Management Fees, Amount Management Services Agreement, Termination Agreement , Final Installment Of Unpaid Management Fees, Amount Income taxes Income Taxes Paid, Net Treasury stock repurchases (in shares) Treasury Stock, Shares, Acquired 2023 Repurchase Program 2023 Repurchase Program [Member] 2023 Repurchase Program Award Timing Disclosures [Line Items] Debt outstanding Total Long-Term Debt, Gross Schedule of Gains on Equity Securities Included in Recognized Gains and Losses Gain (Loss) on Securities [Table Text Block] Subsidiary dividends paid to noncontrolling interests Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders Reclassification adjustments for unrealized gains and losses on unconsolidated affiliates, net of tax, included in net earnings, tax expense Other Comprehensive Income Loss Reclassification Adjustment For Net Unrealized Gains Losses On Unconsolidated Affiliates, Net Of Tax, Include Net Earnings. Tax Other Comprehensive Income Loss Reclassification Adjustment For Net Unrealized Gains Losses On Unconsolidated Affiliates, Net Of Tax, Include Net Earnings. Tax Owned investment (in shares) Investment Owned, Balance, Shares Net loss attributable to Cannae Holdings, Inc. common shareholders Net income (loss) attributable to Dun & Bradstreet Net Income (Loss) Attributable to Parent Expiration Date Trading Arrangement Expiration Date Equity Method Investment, Nonconsolidated Investee [Domain] Equity Method Investment, Nonconsolidated Investee [Domain] Other Commitments [Domain] Other Commitments [Domain] Equity: Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] Less: net gains (losses) recognized during the period on equity securities sold, transferred or disposed during the period Equity Securities, FV-NI, Unrealized Gain (Loss) Schedule of Investments, Aggregate Fair Value of Ownership and Equity in Earnings of Unconsolidated Affiliates Equity Method Investments [Table Text Block] Property and equipment, net Property, Plant and Equipment, Net Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Preferred stock authorized (in shares) Preferred Stock, Shares Authorized Treasury stock repurchases Payments for Repurchase of Common Stock Adoption Date Trading Arrangement Adoption Date Compensation Actually Paid vs. Net Income Compensation Actually Paid vs. Net Income [Text Block] Wine Direct Fulfillment Wine Direct Fulfillment [Member] Wine Direct Fulfillment Paysafe Paysafe [Member] Paysafe Entity Current Reporting Status Entity Current Reporting Status 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 Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Operating loss Operating income (Loss) Operating income Operating Income (Loss) Consolidated Entities [Domain] Consolidated Entities [Domain] Retained earnings Retained Earnings (Accumulated Deficit) Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] 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] Executive Category: Executive Category [Axis] 2026 Recorded Unconditional Purchase Obligation, to be Paid, Year One Class of Stock [Axis] Class of Stock [Axis] Borrowings Proceeds from Issuance of Long-Term Debt Current Fiscal Year End Date Current Fiscal Year End Date Other Other Products And Services [Member] Other Products And Services [Member] Subsequent Event Type [Domain] Subsequent Event Type [Domain] 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] Statement [Table] Statement [Table] 2028 Recorded Unconditional Purchase Obligation, to be Paid, Year Three Clearlake Capital Group, L.P Clearlake Capital Group, L.P [Member] Clearlake Capital Group, L.P Put Right Derivative Liability Adjustments to reconcile net loss to net cash used in operating activities: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity [Abstract] Equity Securities without Readily Determinable Fair Value [Table] Equity Securities without Readily Determinable Fair Value [Table] Cash flows from financing activities: Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract] Equity Awards Adjustments, Excluding Value Reported in Compensation Table Equity Awards Adjustments, Excluding Value Reported in the Compensation Table [Member] Management Fees Expense Management Fees Expense [Member] Management Fee Expense Equity Securities without Readily Determinable Fair Value [Line Items] Equity Securities without Readily Determinable Fair Value [Line Items] Treasury shares issued for investment in JANA Stock Issued For Equity Investment, Value Stock Issued For Equity Investment, Value AmeriLife and Other AmeriLife and Other [Member] AmeriLife and Other Deferred revenue (contract liabilities) Contract with Customer, Liability Distributions from investments in unconsolidated affiliates Dividends received Proceeds from Equity Method Investment, Distribution Schedule of Fair Value of Assets and Liabilities Measured at Fair Value on a Recurring Basis Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Vesting of shares held in trust (in shares) Share-Based Compensation Arrangement, Shares Vested, Held In Trust, Shares Share-Based Compensation Arrangement, Shares Vested, Held In Trust, Shares Other long-term investments and non-current assets Other Long Term Investments And Noncurrent Assets [Member] Other Long Term Investments And Noncurrent Assets Weighted Average Shares Outstanding Weighted Average Number of Shares Outstanding, Diluted [Abstract] All Adjustments to Compensation All Adjustments to Compensation [Member] Accounts payable and other accrued liabilities, current Accounts Payable and Accrued Liabilities, Current Amendment Flag Amendment Flag 2027 Long-Term Debt, Maturity, Year Two Other Commitments [Table] Other Commitments [Table] Termination Date Trading Arrangement Termination Date Net cash used in financing activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Insider Trading Policies and Procedures Adopted Insider Trading Policies and Procedures Adopted [Flag] Measure: Measure [Axis] Difference between the historical cost of treasury stock and fair value upon reissuance for investment in JANA Noncash, Increase (Decrease) Treasury Stock, Historical Costs And Fair Value At Reissuance Noncash, Increase (Decrease) Difference Treasury Stock, Historical Costs And Fair Value At Reissuance Other Other Notes Payable [Member] Other Notes Payable [Member] Weighted average shares outstanding Cannae Holdings common stock, basic basis (in shares) Weighted Average Number of Shares Outstanding, Basic Supplemental Cash Flow Information Cash Flow, Supplemental Disclosures [Text Block] Cost of restaurant revenue Cost of revenue Cost of Product and Service Sold Sale of stock (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 Disposal Group Classification [Domain] Disposal Group Classification [Domain] MSA termination fee annual installments, payment period Management Services Agreement, Termination Fee Annual Installments, Payment Period Management Services Agreement, Termination Fee Annual Installments, Payment Period Related Party Transaction [Domain] Related Party Transaction [Domain] Segment Reporting [Abstract] Segment Reporting [Abstract] Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Debt Disclosure [Abstract] Debt Disclosure [Abstract] Forgone Recovery due to Violation of Home Country Law, Amount Forgone Recovery due to Violation of Home Country Law, Amount Reclassification adjustments for unrealized gains and losses of unconsolidated affiliates, net of tax, included in net earnings Reclassification adjustments for unrealized gains and losses on unconsolidated affiliates, net of tax, included in net earnings (loss) Other Comprehensive Income Loss Reclassification Adjustment For Net Unrealized Gains Losses On Unconsolidated Affiliates, Net Of Tax, Include Net Earnings Other Comprehensive Income Loss Reclassification Adjustment For Net Unrealized Gains Losses On Unconsolidated Affiliates, Net Of Tax, Include Net Earnings Other income (expense): Nonoperating Income (Expense) [Abstract] Entity Tax Identification Number Entity Tax Identification Number Proceeds from sale of investments in unconsolidated affiliates and other long term investments Cash proceeds from WD transaction Proceeds from Sale of Equity Method Investments Schedule of Variable Interest Entities Schedule of Variable Interest Entities [Table Text Block] Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Consolidated Entities [Axis] Consolidated Entities [Axis] Common stock, par value (in usd per share) Common Stock, Par or Stated Value Per Share Common stock issued (in shares) Common Stock, Shares, Issued Income taxes receivable Income Taxes Receivable, Current 2029 Long-Term Debt, Maturity, Year Four Unrealized gains (losses) recognized during the reporting period on equity securities held at the reporting date Equity Securities, FV-NI, Realized Gain (Loss) 2025 (remaining) Recorded Unconditional Purchase Obligation, to be Paid, Remainder of Fiscal Year Terminated Amended Management Services Agreement Termination Fees Installment That Would Have Been Due Under The MSA July 1 2026 Terminated Amended Management Services Agreement Termination Fees Installment That Would Be Due Under The MSA July 1 2026 [Member] Terminated Amended Management Services Agreement Termination Fees Installment That Would Be Due Under The MSA July 1 2026 Management Estimates Use of Estimates, Policy [Policy Text Block] Guarantor Obligations, Nature [Axis] Guarantor Obligations, Nature [Axis] Interest expense Interest expense Interest Expense, Nonoperating Trading Arrangement: Trading Arrangement [Axis] Income taxes Increase (Decrease) in Income Taxes Payable Total Shareholder Return Amount Total Shareholder Return Amount 2020 Margin Facility 2020 Margin Facility [Member] 2020 Margin Facility Insider Trading Arrangements [Line Items] Security Exchange Name Security Exchange Name Interest, investment and other income Investment Income, Interest and Dividend 2025 (remaining) Long-Term Debt, Maturity, Remainder of Fiscal Year Total liabilities Liabilities Shares held and subject to put right, percentage Common Stock, Shares Held And Subject To Put Right, Percentage Common Stock, Shares Held And Subject To Put Right, Percentage Aggregate borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Pension Adjustments Prior Service Cost Pension Adjustments Prior Service Cost [Member] Proceeds from sales of Dayforce shares Proceeds From Equity Method Investments, One Proceeds From Equity Method Investments, One Operating expenses: Operating Expenses [Abstract] Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Repurchase in excess of trading price, percentage Option Indexed to Issuer's Equity, Repurchase In Excess Of Trading Price, Percentage Option Indexed to Issuer's Equity, Repurchase In Excess Of Trading Price, Percentage Restaurant revenue Restaurant sales Restaurant Sales [Member] Restaurant Sales [Member] Asset Class [Domain] Asset Class [Domain] Equity method investment, contingent consideration liability Equity Method Investment, Contingent Consideration Liability Equity Method Investment, Contingent Consideration Liability Terminated Amended Management Services Agreement Termination Fees Installment That Would Have Been Due Under 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 Statement [Line Items] Statement [Line Items] Consolidation Items [Axis] Consolidation Items [Axis] Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Cash and cash equivalents Cash and Cash Equivalent Change in deferred taxes Increase (Decrease) in Deferred Income Taxes Common Stock Common Stock [Member] Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Non-NEOs Non-NEOs [Member] Payment Guarantee Payment Guarantee [Member] Net increase in cash and cash equivalents Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation Proceeds from sales of D&B shares Proceeds From Equity Method Investments, Two Proceeds From Equity Method Investments, Two Other operating revenue Total other operating revenue Other Operating Revenue [Member] Total Other Operating Revenue [Member]