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] 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] S1 Backstop Agreement System1 Backstop Agreement [Member] System1 Backstop Agreement System1 System1 [Member] System1 Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Net (loss) earnings attributable to Cannae Holdings, Inc. common shareholders Net Income (Loss) Attributable to Parent Entity Emerging Growth Company Entity Emerging Growth Company Lease assets Operating Lease, Right-of-Use Asset Number of restaurants Number of Restaurants Preferred stock outstanding (in shares) Preferred Stock, Shares Outstanding Unrealized (losses) gains of investments in unconsolidated affiliates Other comprehensive earnings — unrealized losses of investments in unconsolidated affiliates, net of tax Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) On Equity Method Investments Arising During Period, Net Of Tax Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) On Equity Method Investments Arising During Period, Net Of Tax Statistical Measurement [Domain] Statistical Measurement [Domain] Entity Address, Address Line One Entity Address, Address Line One Gross Principal Maturities of Notes Payable Schedule of Maturities of Long-term Debt [Table Text Block] Equity securities: Equity Securities, FV-NI, Current Proceeds from sales of property and equipment Proceeds from Sale of Property, Plant, and Equipment Revenue from Contract with Customer [Abstract] Revenue from Contract with Customer [Abstract] Contract Balances Contract with Customer, 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Holdings LLC Parent ownership percentage Noncontrolling Interest, Ownership Percentage by Parent Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] 2025 Recorded Unconditional Purchase Obligation, to be Paid, Year Three Franchise and other Franchise And Other [Member] Franchise And Other [Member] Related Party [Axis] Related Party [Axis] Distributions from investments in unconsolidated affiliates Proceeds from Equity Method Investment, Distribution Finite-Lived Intangible Assets Finite-Lived Intangible Assets [Member] Recognized (losses) gains, net Nonoperating Gains (Losses) Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] Comprehensive (loss) earnings Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Entity Interactive Data Current Entity Interactive Data Current Backstop subscription, sponsors of Trebia , class B ordinary shares forfeited, exchanged for investee class B ordinary shares as consideration Backstop Subscription, Sponsors of Investee , Class B Ordinary Shares Forfeited, Exchanged for Trebia Class B Ordinary Share Backstop Subscription, Sponsors of Investee , Class B Ordinary Shares Forfeited, Exchanged for Trebia Class B Ordinary Share Amount available to be drawn Line of Credit Facility, Remaining Borrowing Capacity Net (loss) earnings per share (in usd per share) Earnings Per Share, Basic Unrealized (losses) gains recognized during the reporting period on equity securities held at the reporting date Equity Securities, FV-NI, Realized Gain (Loss) Revenue Recognition Revenue from Contract with Customer [Text Block] Document Type Document Type Investments in Alight, net of subscription fees earned Payments to Acquire Equity Securities, FV-NI 2023 Long-Term Debt, Maturity, Year One 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Average Cost Per Share Number of shares sold (in shares) Equity Method Investment, Number of Shares Sold Equity Method Investment, Number of Shares Sold Ownership percentage Ownership (as percentage) Equity Method Investment, Ownership Percentage Condensed Consolidated Balance Sheets Equity Method Investment, Summarized Financial Information [Abstract] Non-cash carried interest expense Paid-in-Kind Interest Maturity on anniversary of closing date Debt Instrument, Maturity, Period Debt Instrument, Maturity, Period Minimum Minimum [Member] Sale of noncontrolling interest in consolidated subsidiary Proceeds from Contributions from Affiliates Basis of Financial Statements Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Affiliated Entity Affiliated Entity [Member] Line of credit outstanding balance Long-term Line of Credit Balance Sheet Location [Domain] Balance Sheet Location [Domain] Less: Comprehensive (loss) earnings attributable to noncontrolling interests Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest (Loss) earnings before income taxes and equity in earnings of unconsolidated affiliates (Loss) earnings before income taxes and equity in earnings 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 D&B Dun & Bradstreet Dun And Bradstreet Corporation [Member] Dun And Bradstreet Corporation [Member] Trading Symbol Trading Symbol 2023 Recorded Unconditional Purchase Obligation, to be Paid, Year One AmeriLife AmeriLife Joint Venture [Member] Equity Funding To AmeriLife Joint Venture [Member] Deferred tax asset Deferred Income Tax Assets, Net Current liabilities: Liabilities, Current [Abstract] 2026 Long-Term Debt, Maturity, Year Four Supplemental Cash Flow Information Cash Flow, Supplemental Disclosures [Text Block] Notes Payable Debt Disclosure [Text Block] Beginning balance, Common Stock (in shares) Ending balance, Common Stock (in shares) Shares, Outstanding Line of Credit Loan Line of Credit Line of Credit [Member] Level 3 Fair Value, Inputs, Level 3 [Member] Difference between carrying amount and underlying equity Equity Method Investment, Difference Between Carrying Amount and Underlying Equity Accounts payable and other accrued liabilities, long term Accounts Payable and Accrued Liabilities, Noncurrent D&B shares received as partial consideration for the Optimal Blue Disposition Noncash or Part Noncash Divestiture, Amount of Consideration Received Senior Lien Senior Lien [Member] Cannae common stock, 0.0001 par value; authorized 115,000,000 shares as of June 30, 2022 and December 31, 2021; outstanding of 80,140,436 and 86,886,034 shares as of June 30, 2022 and December 31, 2021, respectively, and issued of 92,490,514 and 92,460,514 shares as of June 30, 2022 and December 31, 2021, respectively Common Stock, Value, Issued Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Total other (expense) income Nonoperating Income (Expense) Additions to notes receivable Payments to Acquire Notes Receivable Treasury Stock Treasury Stock, Common [Member] Commitments and contingencies - see Note F Commitments and Contingencies Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax Number of directors to be appointed Number of Directors Number of Directors Other Commitments [Table] Other Commitments [Table] Ownership [Axis] Ownership [Axis] Document Period End Date Document Period End Date 2021 Repurchase Program 2021 Repurchase Program [Member] 2021 Repurchase Program Total operating expenses Costs and Expenses Entity Registrant Name Entity Registrant Name Restaurant Group Restaurant Group [Member] Restaurant Group [Member] Change in Accounting Principle Change in Accounting Principle, Equity Method Investments [Policy Text 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Schedule of Available-for-sale Securities [Table] Management Fee Expense , Interest Payable Management Fee Expense , Interest Payable [Member] Management Fee Expense , Interest Payable Consolidation Items [Domain] Consolidation Items [Domain] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Alight Alight, Inc. [Member] Alight, Inc. 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Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Schedule of Investments, Aggregate Fair Value of Ownership and Equity in Earnings of Unconsolidated Affiliates Equity Method Investments [Table Text Block] Subscription for Trebia Class A Common Stock Subscription for Trebia Class A Common Stock [Member] Subscription for Trebia Class A Common Stock Share Repurchase Program [Axis] Share Repurchase Program [Axis] Condensed Consolidated Statements of Operations Income Statement [Abstract] Investments in unconsolidated affiliates Aggregate investment value Equity Method Investments Amendment Flag Amendment Flag Asset Class [Domain] Asset Class [Domain] Paysafe Warrants Paysafe Warrants [Member] Paysafe Warrants Guarantee of all borrowers obligations, period (up to) Guarantee of All Borrowers Obligations, Maximum Period Guarantee of All Borrowers Obligations, Maximum Period 2026 Recorded Unconditional Purchase Obligation, to be Paid, Year Four Related Party Transaction [Axis] Related Party Transaction [Axis] Issuance of restricted stock (in shares) Stock Issued During Period, Shares, Restricted Stock Award, Gross Income tax (benefit) expense Income Tax Expense (Benefit) Total equity Beginning balance Ending balance Total equity Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Other Commitments [Domain] Other Commitments [Domain] O'Charley's and Restaurant Growth Services, LLC O'Charley's and Restaurant Growth Services, LLC [Member] O'Charley's and Restaurant Growth Services, LLC Borrowings Proceeds from Issuance of Long-term Debt Equity Components [Axis] Equity Components [Axis] Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] AAII FPA Forward Purchase Agreement, Purchase of Common Stock [Member] Forward Purchase Agreement, Purchase of Common Stock Total current assets Total current assets Assets, Current Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Sale of Stock 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cash used in operating activities Net Cash Provided by (Used in) Operating Activities Reclassification 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 adjustments for unrealized gains and losses on investments and other financial instruments, net of tax, (excluding investments in unconsolidated affiliates) included in net earnings 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 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stock outstanding (in shares) Common Stock, Shares, Outstanding Financial Instruments [Domain] Financial Instruments [Domain] Shares converted, ratable portion, shares (in shares) Equity Method Investment, Shares Converted, Shares Equity Method Investment, Shares Converted, Shares Percentage of ownership after sale of stock transaction Sale of Stock, Percentage of Ownership after Transaction Recognized losses and asset impairments, net Gain (Loss) on Sale of Assets and Asset Impairment Charges Cost of restaurant revenue Cost of Goods and Services Sold Revenues: Revenues [Abstract] Stock repurchase program, number of shares authorized to be repurchased (up to) Stock Repurchase Program, Number of Shares Authorized to be Repurchased Proceeds from sale of investments in unconsolidated affiliates and other long term investments Proceeds from Sale of Other Investments Forward purchase agreement, commitment to purchase, shares (in shares) Forward Purchase Agreement, Commitment to Purchase, Shares Forward Purchase Agreement, Commitment to Purchase, Shares Equity: Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] Sightline 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 Schedule of Notes Payable Schedule of Long-term Debt Instruments [Table Text Block] Treasury stock repurchases (in shares) Treasury Stock, Shares, Acquired Debt Instrument [Line Items] Debt Instrument [Line Items] Net valuation gain included in other comprehensive earnings Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) Debt service payments Repayments of Long-term Debt Earnings per share Earnings Per Share [Abstract] Reclassification adjustments for unrealized gains and losses of 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 Less: net (losses) gains recognized during the period on equity securities sold or transferred during the period Equity Securities, FV-NI, Unrealized Gain (Loss) Related Party Transaction [Domain] Related Party Transaction [Domain] Document Quarterly Report Document Quarterly Report Total revenues Total revenues, other income and realized gains (losses), net Revenues Net decrease in other assets Increase (Decrease) in Other Operating Assets Line of Credit Facility [Table] Line of Credit Facility [Table] Cash proceeds from settlement of fixed maturity securities and equity in Colt Proceeds from Sale of Debt Securities, Available-for-sale Other long term investments and non-current assets Investments and Other Noncurrent Assets Other Commitments [Line Items] Other Commitments [Line Items] Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Paysafe Paysafe [Member] Paysafe Long-term Debt, Excluding Current Maturities Notes payable, long term Long-term Debt, Excluding Current Maturities Schedule of Related Party Transactions, by Related Party [Table] Schedule of Related Party Transactions, by Related Party [Table] 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] Document Fiscal Period Focus Document Fiscal Period Focus Effective tax rate Effective Income Tax Rate Reconciliation, Percent Lien Category [Axis] Lien Category [Axis] Personnel costs Labor and Related Expense Net (loss) earnings Net (loss) earnings Net loss 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] Counterparty Name [Axis] Counterparty Name [Axis] Forward purchase agreement, investment commitment Forward Purchase Agreement, Commitment To Purchase Equity Interests Forward Purchase Agreement, Commitment To Purchase Equity Interests Ceridian Ceridian [Member] Ceridian [Member] 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 Owned investment (in shares) Investment Owned, Balance, Shares Condensed Consolidated Statements of Comprehensive Earnings Statement of Comprehensive Income [Abstract] Current assets: Assets, Current [Abstract] Leases [Abstract] Leases [Abstract] Cash and cash equivalents classified as held for sale Disposal Group, Including Discontinued Operation, Cash and Cash Equivalents Entity Central Index Key Entity Central Index Key Security Exchange Name Security Exchange Name 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 Other Comprehensive Income (Loss), Net of Tax AmeriLife AmeriLife [Member] AmeriLife Collections of notes receivable Proceeds from Collection of Notes Receivable Fidelity National Financial Inc. Fidelity National Financial Inc. [Member] Fidelity National Financial Inc. Long-term Debt, Type [Axis] Long-term Debt, Type [Axis] Related Party [Domain] Related Party [Domain] Current Fiscal Year End Date Current Fiscal Year End Date Interest rate basis Debt Instrument, Basis Spread on Variable Rate 2024 Recorded Unconditional Purchase Obligation, to be Paid, Year Two 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] Investment in System1 and additional investments in unconsolidated affiliates Payments to Acquire Equity Method Investments Credit Facility [Axis] Credit Facility [Axis] Net cash provided by (used in) investing activities Net Cash Provided by (Used in) Investing Activities 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, net of tax, included in net earnings Reclassification adjustments for unrealized gains and losses on unconsolidated affiliates, net of tax, included in net earnings 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 Underwritten Secondary Public Offering Underwritten Secondary Public Offering [Member] Underwritten Secondary Public Offering [Member] Line of Credit Facility [Line Items] Line of Credit Facility [Line Items] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Title of 12(b) Security Title of 12(b) Security AAII Warrants Austerlitz II Warrants Austerlitz II Warrants [Member] Austerlitz II Warrants Statement [Table] Statement [Table] Other current assets Other Assets, Current Investment commitment to provide line of credit facility (up to) Equity Method Investment, Commitment, Line of Credit Facility, Maximum Borrowing Capacity Equity Method Investment, Commitment, Line of Credit Facility, Maximum Borrowing Capacity Recent Accounting Pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Option to increase limit Line of Credit Facility, Accordion Feature, Increase Limit Line of Credit Facility, Accordion Feature, Increase Limit Other Commitments [Axis] Other Commitments [Axis] 2020 Margin Facility 2020 Margin Facility [Member] 2020 Margin Facility Goodwill Goodwill [Member] Statistical Measurement [Axis] Statistical Measurement [Axis] Subsequent Event Subsequent Event [Member] Cash and cash equivalents Cash and cash equivalents at beginning of period Cash and cash equivalents at end of period Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Including Disposal Group and Discontinued Operations Cover [Abstract] Cover [Abstract] Goodwill Goodwill Goodwill Brasada Interstate Loans Brasada Credit Agreement Brasada Credit Agreement [Member] Brasada Credit Agreement [Member] Total purchase commitments Recorded Unconditional Purchase Obligation Noncontrolling interests Stockholders' Equity Attributable to Noncontrolling Interest Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Restaurant revenue Restaurant sales Restaurant Sales [Member] Restaurant Sales [Member] Net (loss) earnings from continuing operations Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest Income taxes payable Accrued Income Taxes, Current Adjustments to reconcile net loss to net cash used in operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Subsequent Event Type [Axis] Subsequent Event Type [Axis] Purchase of AAII Warrants Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases