Term of automatic extension Debt Instrument, Term Of Automatic Extension Debt Instrument, Term Of Automatic Extension Assets: Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] VIBSQ VIBSQ [Member] VIBSQ Aggregate value of ownership based on quoted market price Equity Method Investment, Quoted Market Value Cash paid during the period: Supplemental Cash Flow Information [Abstract] Letter of Credit Letter of Credit [Member] Earnings Per Share Earnings Per Share, Policy [Policy Text Block] Trade receivables, net Disposal Group, Including Discontinued Operation, Accounts, Notes and Loans Receivable, Net Tailwind Subscription Agreement, Purchase of Common Stock Tailwind Subscription Agreement, Purchase of Common Stock [Member] Tailwind Subscription Agreement, Purchase of Common Stock Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Net earnings (loss) attributable to Cannae Holdings, Inc. common shareholders Net earnings (loss) 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[Member] QOMPLX, Inc. [Member] Fair Value Measurement [Domain] Fair Value Measurement [Domain] Diluted Earnings Per Share, Diluted [Abstract] Entity Current Reporting Status Entity Current Reporting Status Sponsor of Foley Traisimene Acquisition Corp Sponsor of Foley Traisimene Acquisition Corp [Member] Sponsor of Foley Traisimene Acquisition Corp Interest, investment and other income Investment Income, Interest and Dividend Senator JV Senator Focused Strategies [Member] Senator Focused Strategies Disposal Groups, Including Discontinued Operations [Table] Disposal Groups, Including Discontinued Operations [Table] Total Long Term Debt Long-term Debt, Gross Gains on Equity Securities Included in Recognized Gains and Losses Gain (Loss) on Securities [Table Text Block] Plan Name [Axis] Plan Name [Axis] Long-term debt Long-term debt Notes payable, total Long-term debt Long-term Debt Total Assets Assets, Fair Value Disclosure Equity securities received in exchange for investment holdings of corporate debt 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Securities [Abstract] Investments, Debt and Equity Securities [Abstract] Trade receivables, net Accounts Receivable, after Allowance for Credit Loss Deferred revenue Contract with Customer, Liability, Current 99 Revolver 99 Restaurants Credit Facility 99 Restaurants Credit Facility [Member] 99 Restaurants Credit Facility [Member] Scenario [Axis] Scenario [Axis] Colt Colt Holdings, LLC [Member] Restricted cash Restricted Cash Additional paid-in capital Additional Paid in Capital Supplemental Cash Flow Elements [Abstract] Supplemental Cash Flow Elements [Abstract] LIABILITIES AND EQUITY Liabilities and Equity [Abstract] Accounts payable and other accrued liabilities, current Accounts Payable and Accrued Liabilities, Current Acquisition Loan, C Note Notes Payable To Banks, Acquisition Loan, C Note [Member] Notes Payable To Banks, Acquisition Loan, C Note Income Tax Contingency [Table] Income Tax Contingency [Table] Intangible assets Disposal Group, Including Discontinued Operation, 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(losses) earnings of unconsolidated affiliates (Loss) earnings before income taxes and equity in earnings (losses) of unconsolidated affiliates Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest Preferred stock authorized (in shares) Preferred Stock, Shares Authorized 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 loss Other Comprehensive (Income) Loss, Reclassification Adjustment For Net Unrealized (Gains) Losses On Unconsolidated Affiliates And Other Investment Included In Net Earnings, Net Of Tax Other Comprehensive (Income) Loss, Reclassification Adjustment For Net Unrealized (Gains) Losses On Unconsolidated Affiliates and Other Investments Included In Net Earnings, Net of Tax FTAC Foley Trasimene Acquisition Corp [Member] Foley Trasimene Acquisition Corp Legendary Baking Legendary Baking [Member] Legendary Baking Unrealized Gains Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax Sale of noncontrolling interest in consolidated subsidiary Noncontrolling Interest, Increase from Sale of Parent Equity Interest D & B Dun & Bradstreet Dun And Bradstreet Corporation Dun And Bradstreet Corporation [Member] Dun And Bradstreet Corporation [Member] Trading Symbol Trading Symbol 2022 Recorded Unconditional Purchase Obligation, to be Paid, Year One Ownership after business acquisition, percentage Business Acquisition, Percentage of Voting Interests Acquired AmeriLife AmeriLife Joint Venture [Member] Equity Funding To AmeriLife Joint Venture [Member] Current liabilities: Liabilities, Current [Abstract] 2025 Long-Term Debt, Maturity, Year Four Equity offering, net of offering costs Stock Issued During Period, Value, New Issues Management fee expenses Management Fee Expense Supplemental 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December 31, 2020, respectively Common Stock, Value, Issued Dividends attributable to preferred equity and noncontrolling interest expense Preferred Stock Dividends and Other Adjustments Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Total other income (expense) Nonoperating Income (Expense) Total liabilities Disposal Group, Including Discontinued Operation, Liabilities Additions to notes receivable Payments to Acquire Notes Receivable Commitments and contingencies - see Note G Commitments and Contingencies Shares received (in shares) Investment in Equity Securities, Shares Converted Common Stock of New Entity, Received Investment in Equity Securities, Shares of Converted Common Stock of New Entity Received Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax Number of directors to be appointed Number of Directors Number of Directors Acquisition Loan, B Note Notes Payable To Banks, Acquisition Loan, B Note 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Investment, Nonconsolidated Investee [Axis] 2021 (remaining) Recorded Unconditional Purchase Obligation, to be Paid, Remainder of Fiscal Year Equity securities, at fair value Equity Securities, FV-NI, Noncurrent Forward purchase agreement, sale of stock, proceeds Forward Purchase Agreement, Sale of Stock, Consideration Received on Transaction Forward Purchase Agreement, Sale of Stock, Consideration Received on Transaction Net other investing activities Payments for (Proceeds from) Other Investing Activities Investments Investments In Available-For-Sale Debt Securities And Equity Method Investments [Text Block] Investments In Available-For-Sale Debt Securities And Equity Method Investments [Text Block] Reclassification from accumulated other comprehensive income for gain, tax benefit Reclassification from accumulated other comprehensive income for gain, tax Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax Total liabilities Total 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adjustments for unrealized gains and losses on investments and other financial instruments, net of tax, (excluding investments in unconsolidated affiliates) included in net earnings Reclassification from accumulated other comprehensive income for gain Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax Other noncurrent assets: Other Assets, Noncurrent, Fair Value Other Assets, Noncurrent, Fair Value Fair Value, Recurring and Nonrecurring [Table] Fair Value, Recurring and Nonrecurring [Table] Schedule of Long-term Debt Instruments [Table] Schedule of Long-term Debt Instruments [Table] Entity Tax Identification Number Entity Tax Identification Number Purchase Obligations Recorded Unconditional Purchase Obligations [Table Text Block] Basic Earnings Per Share, Basic [Abstract] Other assets Disposal Group, Including Discontinued Operation, Other Assets Thereafter Long-Term Debt, Maturity, after Year Four Long-Term Debt, Maturity, after 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shareholders Comprehensive Income (Loss), Net of Tax, Attributable to Parent Other intangible assets, net Intangible Assets, Net (Excluding Goodwill) Deferred revenue (contract liabilities) Contract with Customer, Liability Proceeds from investment in PIPE, fees Proceeds from Investment in Private Placement in Public Equity, Fees Proceeds from Investment in Private Placement in Public Equity, Fees Valuation of, and recorded non-cash gain on, the Alight Subscription Agreement and Tailwind Subscription Agreement Valuation of, and recorded non-cash gain on, the Alight Subscription Agreement and Tailwind Subscription Agreement [Member] Valuation of, and recorded non-cash gain on, the Alight Subscription Agreement and Tailwind Subscription Agreement Net cash (used in) provided by financing activities Net Cash Provided by (Used in) Financing Activities Operating leases Cash Paid For Operating Leases Cash Paid For Operating Leases Other comprehensive (loss) earnings, net of tax: Other Comprehensive Income (Loss), Net of Tax [Abstract] Less: Treasury stock, 3,268,876 and 740,708 shares as of June 30, 2021 and December 31, 2020, respectively, at cost Treasury Stock, Value Weighted Average Shares Outstanding Weighted Average Number of Shares Outstanding, Diluted [Abstract] Deferred tax liability Deferred Income Tax Liabilities, Net Equity in (losses) earnings of unconsolidated affiliates Equity in earnings of unconsolidated affiliates Income (Loss) from Equity Method Investments Income (Loss) from Equity Method Investments Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] O'Charley's O'Charley's [Member] O'Charley's Other operating expenses Other Cost and Expense, Operating Corporate debt securities Corporate debt securities Corporate Debt Securities [Member] Fair Value Measurements Fair Value Disclosures [Text Block] Depreciation and amortization Depreciation and amortization Depreciation, Depletion and Amortization Schedule of Fair Value 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[Domain] Consolidated Entities [Domain] 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] Forward purchase agreement, commitment to purchase, shares (in shares) Forward Purchase Agreement, Commitment to Purchase, Shares Forward Purchase Agreement, Commitment to Purchase, Shares Number of shares called by each warrant Subscription Agreement, Common Stock, Number Of Securities Called By Each Warrant or Right Subscription Agreement, Common Stock, Number Of Securities Called By Each Warrant or Right Subscription agreement, commitment to purchase Subscription Agreement, Commitment to Purchase, Shares, Value Subscription Agreement, Commitment to Purchase, Shares, Value Foley Trasimene Acquisition Corp, Forward Purchase Agreement Foley Trasimene Acquisition Corp, Forward Purchase Agreement [Member] Foley Trasimene Acquisition Corp, Forward Purchase Agreement Debt instrument, term Debt Instrument, Term Equity: Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] Bridge Loan Bridge Loan [Member] Disposal Group, Held-for-sale, Not Discontinued Operations Disposal Group, Held-for-sale, Not Discontinued Operations [Member] Sightline Payments LLC Sightline Payments LLC [Member] Sightline Payments LLC Property and equipment, net Property, Plant and Equipment, Net Other non-current liabilities Other Liabilities, Noncurrent Related Party Transactions Related Party Transactions [Policy Text Block] Related Party Transactions Direct interest in private placement warrants (in shares) Equity Method Investment, Direct Interest, Number of Warrants Equity Method Investment, Direct Interest, Number of Warrants Lender Name [Axis] Lender Name [Axis] Schedule of Notes Payable Schedule of Long-term Debt Instruments [Table Text Block] Treasury stock 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settlement of fixed maturity securities and equity in Colt Proceeds from sale of debt securities Proceeds from Sale of Debt Securities, Available-for-sale Foley Trasimene Acquisition Corp. II Foley Trasimene Acquisition Corp. II [Member] Foley Trasimene Acquisition Corp. II Sponsor, FTAC II Sponsor, FTAC II [Member] Sponsor, FTAC II Other long term investments and non-current assets Investments and Other Noncurrent Assets Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Noncontrolling interest - nonredeemable Nonredeemable Noncontrolling Interest Paysafe Paysafe Paysafe [Member] Paysafe Notes payable, long term Notes payable, long term Long-term Debt, Excluding Current Maturities Goodwill and other intangible assets, net Goodwill and other intangible assets, net Intangible Assets, Net (Including Goodwill) Schedule of Equity Method Investments [Line Items] Schedule of Equity Method Investments [Line Items] Collective voting interest with other equity sponsors (greater than) Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners Document Fiscal Period Focus Document Fiscal Period Focus Percentage of ownership before stock sale transaction Sale of Stock, Percentage of Ownership before Transaction Backstop Agreements Backstop Agreements [Member] Backstop Agreements Effective tax rate Effective Income Tax Rate Reconciliation, Percent Lien Category [Axis] Lien Category [Axis] Personnel costs Labor and Related Expense Net earnings (loss) Net earnings (loss) Net (loss) earnings Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Acquisition Loan Notes Payable To Banks, Acquisition Loan [Member] Notes Payable To Banks, Acquisition Loan [Member] Other Other Products And Services [Member] Other Products And Services [Member] Forward purchase agreement, investment commitment Forward Purchase Agreement, Commitment To Purchase Equity Interests Forward Purchase Agreement, Commitment To Purchase Equity Interests Ceridian Ceridian Ceridian [Member] Ceridian [Member] Senator JV Senator JV [Member] Senator JV Sale of stock (in shares) Sale of Stock, Number of Shares Issued in Transaction Common stock, par value (in usd per share) Common Stock, Par or Stated Value Per Share Total member's equity Limited Liability Company (LLC) Members' Equity, Including Portion Attributable to Noncontrolling Interest Variable Interest Entities Variable Interest Entity Disclosure [Text Block] Owned investment (in shares) Investment Owned, Balance, Shares Condensed Consolidated Statements of Comprehensive Earnings Statement of Comprehensive Income [Abstract] Current assets: Assets, Current [Abstract] Cash and cash equivalents classified as held for sale - see Note J Cash and cash equivalents Disposal Group, Including Discontinued Operation, Cash and Cash Equivalents Entity Central Index Key Entity Central Index Key LIBOR London Interbank Offered Rate (LIBOR) [Member] Security Exchange Name Security Exchange Name Disposal Group Classification [Domain] Disposal Group Classification [Domain] Revenue Recognition Revenue from Contract with Customer [Policy Text Block] Weighted average shares outstanding Cannae Holdings common stock, diluted basis (in shares) Weighted Average Number of Shares Outstanding, Diluted Fair value, beginning of period Fair value, end of period Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value Other comprehensive (loss) earnings Other Comprehensive Income (Loss), Net of Tax AmeriLife AmeriLife [Member] AmeriLife Collections of notes receivable Proceeds from Collection of Notes Receivable Gain on transaction Debt and Equity Securities, Realized Gain (Loss) Long-term Debt, Type [Axis] Long-term Debt, Type [Axis] Current Fiscal Year End Date Current Fiscal Year End Date Interest rate basis Debt Instrument, Basis Spread on Variable Rate Sponsor, FTAC Sponsor, FTAC [Member] Sponsor, FTAC Carrying Amounts of Major Classes of Assets and Liabilities Disposal Groups, Including Discontinued Operations [Table Text Block] Measurement Basis [Axis] Measurement Basis [Axis] 2023 Recorded Unconditional Purchase Obligation, to be Paid, Year Two Alight Subscription Agreement, Purchase of Common Stock Alight PIPE subscription Alight Subscription Agreement, Purchase of Common Stock [Member] Alight Subscription Agreement, Purchase of Common Stock Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Other income (expense): Nonoperating Income (Expense) [Abstract] Other Other Notes Payable [Member] Other Notes Payable [Member] Maximum Exposure Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount Additional investments in unconsolidated affiliates Equity investment Equity investment Payments to Acquire Equity Method Investments Credit Facility [Axis] Credit Facility [Axis] Net cash (used in) provided by investing activities Net Cash Provided by (Used in) Investing Activities Portion at Fair Value Measurement Portion at Fair Value Measurement [Member] Changes in assets and liabilities, net of effects from acquisitions: Increase (Decrease) in Operating Capital [Abstract] Cash flows from operating activities: Net Cash Provided by (Used in) Operating Activities [Abstract] Principles of Consolidation and Basis of Presentation Consolidation, Policy [Policy Text Block] Reclassification adjustments for unrealized gains and losses of unconsolidated affiliates, tax expense 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 Total current liabilities Current liabilities Liabilities, Current Affiliate Elimination Intersegment Eliminations [Member] Lien Category [Domain] Lien Category [Domain] Forward Purchase Agreements Forward Purchase Agreements [Member] Forward Purchase Agreements Aggregate borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Equity Method Investment, Financial Statement, Reported Amounts [Abstract] Equity Method Investment, Financial Statement, Reported Amounts [Abstract] Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Ownership [Domain] Ownership [Domain] Entity Address, Postal Zip Code Entity Address, Postal Zip Code Proceeds equity securities Proceeds from Sale of Equity Securities, FV-NI Underwritten Secondary Public Offering Underwritten Secondary Public Offering [Member] Underwritten Secondary Public Offering [Member] Decrease in borrowing capacity Line of Credit Facility, Increase (Decrease) Borrowing Capacity Line of Credit Facility, Increase (Decrease) Borrowing Capacity Line of Credit Facility [Line Items] Line of Credit Facility [Line Items] Assets held for sale - 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