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[Member] Alight, Inc. 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[Member] Cannae Holdings Inc. [Member] Entity [Domain] Entity [Domain] Payment for shares withheld for taxes and in treasury Payment, Tax Withholding, Share-based Payment Arrangement Issuance of restricted stock (in shares) Stock Issued During Period, Shares, Restricted Stock Award, Gross 2023 Recorded Unconditional Purchase Obligation, to be Paid, Year Three Senator Focused Strategies Senator Focused Strategies [Member] Senator Focused Strategies Other Intangible Assets Intangible Assets Disclosure [Text Block] Unrealized gain upon change in accounting Equity Securities, FV-NI, Unrealized Gain Property and equipment, useful lives Property and equipment useful life Property, Plant and Equipment, Useful Life Affiliated Entity Affiliated Affiliated Entity [Member] Goodwill [Line Items] Goodwill [Line Items] Lessee, Lease, Description [Line Items] Lessee, Lease, Description [Line Items] Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] Accounts payable and other accrued liabilities, current Accounts Payable and Accrued Liabilities, Current [Abstract] Customer relationships and contracts Customer Relationships And Contracts [Member] Customer Relationships And Contracts [Member] Net deferred tax (liability) asset Net deferred tax (liability) asset Deferred Tax Assets, Net Fixed maturity securities available for sale, at fair value Fair Value Debt Securities, Available-for-sale Commitment to purchase, shares, warrants (in shares) Forward Purchase Agreement, Commitment to Purchase, Shares Forward Purchase Agreement, Commitment to Purchase, Shares Depreciation and amortization Cost, Depreciation and Amortization Restricted Stock Transactions Under Omnibus Plan Share-based Payment Arrangement, Activity [Table Text Block] Equity offering proceeds, net of capitalized costs Proceeds from Issuance or Sale of Equity Restricted Stock Restricted Stock [Member] Share-based Payment Arrangement [Abstract] Share-based Payment Arrangement [Abstract] Consolidated Entities [Domain] Consolidated Entities [Domain] Land Land [Member] Lease liabilities, current Less: operating lease liability as of December 31, 2020, current Operating Lease, Liability, Current Financing obligations assumed by O'Charley's in exchange for property Right-of-Use Asset Obtained in Exchange for Finance Lease Liability Cash acquired upon acquisition of Legendary Baking and VIBSQ - see Note I Cash Acquired in Excess of Payments to Acquire Business Cost of restaurant revenue Other Cost of Operating Revenue Fair Value Measurements Fair Value Disclosures [Text Block] Brasada Interstate Loans Interstate Credit Agreement Brasada Credit Agreement [Member] Brasada Credit Agreement [Member] Cumulative Effect, Period of Adoption, Adjustment Cumulative Effect, Period of Adoption, Adjustment [Member] Alight Subscription Agreement, Purchase of Common Stock Alight Subscription Agreement, Purchase of Common Stock [Member] Alight Subscription Agreement, Purchase of Common Stock Other Intangible Assets Goodwill and Intangible Assets, Intangible Assets, Policy [Policy Text Block] 2020 Margin Facility 2020 Margin Facility [Member] 2020 Margin Facility Entity Registrant Name Entity Registrant Name Subsequent Event Type [Domain] Subsequent Event Type [Domain] Business Acquisition [Line Items] Business Acquisition [Line Items] Lease weighted average discount rate, percent Operating Lease, Weighted Average Discount Rate, Percent Optimal Blue Optimal Blue [Member] Optimal Blue Bakery sales Bakery Sales [Member] Bakery Sales [Member] Impairments of assets Asset Impairment Charges Dun & Bradstreet & Optimal Blue Elimination Intersegment Eliminations [Member] Debtor-in-possession financing to be provided Debtor-in-Possession Financing, Amount Arranged Property obtained by O'Charley's in exchange for stores Land Acquired In Exchange For Transferred Properties Land Acquired In Exchange For Transferred Properties Restaurant revenue Restaurant Sales [Member] Restaurant Sales [Member] Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Non-cash contribution of CoreLogic stock to Senator JV Non-cash Contribution of Stock to Joint Venture Non-cash Contribution of Stock to Joint Venture Adjustments for New Accounting Pronouncements [Axis] Accounting Standards Update [Axis] Variable interest rate, increase Debt Instrument, Basis Spread on Variable Rate, Increase Debt Instrument, Basis Spread on Variable Rate, Increase Unrealized Losses Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax Percentage of assets and uncompromised liabilities acquired Business Acquisition, Percentage of Assets and Uncompromised Liabilities Acquired Business Acquisition, Percentage of Assets and Uncompromised Liabilities Acquired ASU 2016-02 Accounting Standards Update 2016-02 [Member] Operating Loss Carryforwards [Line Items] Operating Loss Carryforwards [Line Items] Sale of Stock [Axis] Sale of Stock [Axis] Entity Address, Postal Zip Code Entity Address, Postal Zip Code Total deferred tax asset Deferred Tax Assets, Net of Valuation Allowance Depreciation and amortization Disposal Group, Including Discontinued Operation, Depreciation and Amortization Goodwill Balance, beginning of year Balance, end of year Goodwill Goodwill Debt Securities, Available-for-sale [Line Items] Debt Securities, Available-for-sale [Line Items] Purchases of other long-term investments Payments to Acquire Long-term Investments Paysafe Paysafe [Member] Paysafe Net operating loss carryforwards Deferred Tax Assets, Operating Loss Carryforwards Net change in income taxes Increase (Decrease) in Income Taxes Payable Face amount of loan Debt Instrument, Face Amount Unrealized gains recognized during the reporting period on equity securities still held at December 31, 2020 Equity Securities, FV-NI, Realized Gain (Loss) Other current assets Other Assets, Current Schedule of Goodwill Schedule of Goodwill [Table Text Block] Asset Class [Domain] Asset Class [Domain] Total assets Assets, Fair Value Disclosure Dun & Bradstreet equity issuance costs Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs Discontinued Operations Disposal Groups, Including Discontinued Operations, Disclosure [Text Block] CoreLogic, Inc. CoreLogic, Inc. [Member] CoreLogic, Inc. Gain (Loss) on Securities Gain (Loss) on Securities [Table Text Block] Deferred revenue Contract with Customer, Liability, Current Weighted average shares outstanding Cannae Holdings common stock, diluted basis (in shares) Weighted Average Number of Shares Outstanding, Diluted Letter of credit Letter of Credit [Member] Accounts Payable and Other Accrued Liabilities, Current and Long Term Schedule of Accounts Payable and Accrued Liabilities [Table Text Block] Services agreement, successive renewal terms Management Services Agreement, Renewal Term Management Services Agreement, Renewal Term Debt Disclosure [Abstract] Debt Disclosure [Abstract] Net cash provided by (used in) financing activities Net Cash Provided by (Used in) Financing Activities Debt service payments Repayment of debt Repayments of Long-term Debt Unrecognized tax benefits Unrecognized Tax Benefits Counterparty Name [Axis] Counterparty Name [Axis] Cannae common stock, $0.0001 par value; authorized 115,000,000 shares as of 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of CSA services from FNF Stock Issued During Period, Value, Issued for Services Notes payable, long-term Notes payable, long term Long-term Debt, Excluding Current Maturities Trade receivables, billed Accounts Receivable, after Allowance for Credit Loss Segment Reporting [Abstract] Segment Reporting [Abstract] Debt Instrument [Line Items] Debt Instrument [Line Items] Total Cannae shareholders' equity Beginning balance Ending balance Stockholders' Equity Attributable to Parent Total consideration transferred Business Combination, Consideration Transferred Shares issued in business combination (in shares) Business Acquisition, Equity Interest Issued or Issuable, Number of Shares Entity Address, City or Town Entity Address, City or Town Accrued payroll and employee benefits Employee-related Liabilities, Current Legendary Baking and VIBSQ Legendary Baking and VIBSQ [Member] Legendary Baking and VIBSQ The Omnibus Plan The Omnibus Plan [Member] The Omnibus Plan [Member] Fair Value Hierarchy 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[Member] Fidelity National Financial, Inc. [Member] Ceridian Ceridian HCM Holding, Inc. [Member] Ceridian HCM Holding, Inc. 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flows from investing activities: Net Cash Provided by (Used in) Investing Activities [Abstract] 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] Net (increase) decrease in trade receivables Increase (Decrease) in Accounts Receivable Statement of Comprehensive Income [Abstract] Statement of Comprehensive Income [Abstract] Total liabilities and equity Total liabilities and equity Liabilities and Equity ASU 2014-09 Accounting Standards Update 2014-09 [Member] Loss Contingencies [Line Items] Loss Contingencies [Line Items] Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax Income Taxes Income Tax Disclosure [Text Block] Portion at Fair Value Measurement [Member] Portion at Fair Value Measurement [Member] Foley Trasimene Acquisition Corp Foley Trasimene Acquisition Corp [Member] Foley Trasimene Acquisition Corp Fifth Third Bank Fifth Third Bank [Member] Fifth Third Bank [Member] Operating lease cost Operating Lease, Cost Total liabilities assumed Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities Antidilutive shares excluded from calculation of diluted earnings per share (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Current Current Income Tax Expense (Benefit) Line of Credit Facility [Line Items] Line of Credit Facility [Line Items] Intangible assets, useful lives Finite-Lived Intangible Asset, Useful Life Equity Component [Domain] Equity Component [Domain] Condensed Combined Balance Sheets Equity Method Investment, Summarized Financial Information [Abstract] Equity Method Investment, Nonconsolidated Investee [Axis] Equity Method Investment, Nonconsolidated Investee [Axis] Property and equipment, net Property and equipment, net Property, Plant and Equipment, Net Entity Tax Identification Number Entity Tax Identification Number Lessee, Lease, Description [Table] Lessee, Lease, Description [Table] Employee Benefit Plans Share-based Payment Arrangement [Text Block] Net earnings attributable to Cannae Holdings, Inc. common shareholders Net Income (Loss) Attributable to Parent Changes in assets and liabilities, net of effects from acquisitions: Increase (Decrease) in Operating Capital [Abstract] Schedule of Variable Interest Entities [Table] Schedule of Variable Interest Entities [Table] LIBOR London Interbank Offered Rate (LIBOR) [Member] Tradenames Tradenames Trade Names [Member] Current Fiscal Year End Date Current Fiscal Year End Date Operating expenses: Operating Expenses [Abstract] Ninety-Nine Restaurants, LLC 99 Restaurants Ninety-Nine Restaurants [Member] Ninety-Nine Restaurants [Member] Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated Other Comprehensive Income (Loss) [Line Items] Subscription Agreement, Purchase of Common Stock Paysafe Subscription Agreement Paysafe Subscription Agreement, Purchase of Common Stock [Member] Paysafe Subscription Agreement, Purchase of Common Stock Accounts payable and other accrued liabilities, long-term Accounts payable and other accrued liabilities, long term Accounts Payable and Accrued Liabilities, Noncurrent Cash paid during the year: Supplemental Cash Flow Information [Abstract] Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] Collections of notes receivable Proceeds from Collection of Notes Receivable Proceeds from sale of LifeWorks Proceeds From Divestiture Of Business Two Proceeds From Divestiture Of Business Two Property, Plant and Equipment [Line Items] Property, Plant and Equipment [Line Items] Property, Plant and Equipment, Type [Domain] Long-Lived Tangible Asset [Domain] Non-cash investing and financing activities: Non Cash Investing Activities [Abstract] Non Cash Investing Activities [Abstract] 2025 Recorded Unconditional Purchase Obligation, to be Paid, Year Five Decrease borrowing capacity Line of Credit Facility, Increase (Decrease) Borrowing Capacity Line of Credit Facility, Increase (Decrease) Borrowing Capacity Schedule of Property and Equipment Property, Plant and Equipment [Table Text Block] Other Commitments [Domain] Other Commitments [Domain] Amount available to borrow Line of Credit Facility, Remaining Borrowing Capacity Shares issued for during the period (in shares) Stock issued (in shares) Stock Issued During Period, Shares, New Issues Amortizable intangible assets, gross Finite-Lived Intangible Assets, Gross Unrealized (loss) gain relating to investments in unconsolidated affiliates Accumulated Net Unconsolidated Investment Gain (Loss) Including Portion Attributable To Parent [Member] Accumulated Net Unconsolidated Investment Gain (Loss) Including Portion Attributable To Parent [Member] Other intangible assets: Finite-Lived Intangible Assets, Net [Abstract] Less than 12 Months Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss Accumulated depreciation and amortization Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Related Party Transactions [Abstract] Related Party Transactions [Abstract] 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) Future Payments Under Operating Lease Arrangements Under ASC Topic 842 Lessee, Operating Lease, Liability, Maturity [Table Text Block] Basis of Presentation Basis of Accounting, Policy [Policy Text Block] Weighted average shares outstanding Cannae Holdings common stock, basic basis (in shares) Weighted Average Number of Shares Outstanding, Basic Basis spread on variable rate Debt Instrument, Basis Spread on Variable Rate Ownership [Axis] Ownership [Axis] Recognized loss Disposal Group, Including Discontinued Operation, Realized Gains (Losses) Disposal Group, Including Discontinued Operation, Realized Gains (Losses) Restaurant Group Restructuring Adjustments To Additional Paid In Capital, Restructuring Credit Facility, Subsidiary Adjustments to Additional Paid in Capital, Restructuring Of Loan To Subsidiary Loss Contingencies [Table] Loss Contingencies [Table] Carrying Value Reported Value Measurement [Member] Plan Name [Domain] Plan Name [Domain] Entity Well-Known Seasoned Issuer Entity Well-known Seasoned Issuer Revenue Recognition Revenue from Contract with Customer [Text Block] Ownership (as a percent) Ownership interest, equity method investment (as a percent) Equity Method Investment, Ownership Percentage Lease assets recognized in exchange for lease liabilities Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Cash and Cash Equivalents Cash and Cash Equivalents, Policy [Policy Text Block] Inventory Inventory, Policy [Policy Text Block] Income tax expense Income tax (benefit) expense Income tax (benefit) expense Income Tax Expense (Benefit) Property and Equipment, net Property, Plant and Equipment, Policy [Policy Text Block] Gross Principal Maturities Based Upon Contractual Maturities of Notes Payable Schedule of Maturities of Long-term Debt [Table Text Block] Debt Securities, Available-for-sale [Table] Debt Securities, Available-for-sale [Table] Indefinite-lived Intangible Assets, Major Class Name [Domain] Indefinite-lived Intangible Assets, Major Class Name [Domain] Local Phone Number Local Phone Number Cumulative Effect, Period of Adoption [Domain] Cumulative Effect, Period of Adoption [Domain] Operating loss Disposal Group, Including Discontinued Operation, Operating Income (Loss) Income tax expense (benefit) Discontinued Operation, Tax Effect of Discontinued Operation Schedule of Non-Amortizable Intangible Assets Schedule of Indefinite-Lived Intangible Assets [Table Text Block] Total Long Term Debt Long-term Debt, Gross Deferred revenue (contract liabilities) Contract with Customer, Liability Related Party Transaction [Domain] Related Party Transaction [Domain] Schedule of Finite-Lived Intangible Assets [Table] Schedule of Finite-Lived Intangible Assets [Table] Aggregate borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Award Type [Axis] Award Type [Axis] Weighted Average Grant Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] Forward Purchase Agreement, Purchase of Common Stock Forward Purchase Agreement, Purchase of Common Stock [Member] Forward Purchase Agreement, Purchase of Common Stock Other noncurrent assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets Restricted cash Restricted Cash Accounts payable and accrued liabilities Accounts Payable and Accrued Liabilities Black Knight, Inc. Black Knight, Inc. [Member] Black Knight, Inc. Retained Earnings Retained Earnings [Member] Preferred stock, shares outstanding (in shares) Preferred Stock, Shares Outstanding Measurement Basis [Axis] Measurement Basis [Axis] Net cash (used in) provided by investing activities Net Cash Provided by (Used in) Investing Activities Award Type [Domain] Award Type [Domain] Corporate debt securities Corporate debt securities Corporate Debt Securities [Member] Discontinued Operations and Disposal Groups [Abstract] Discontinued Operations and Disposal Groups [Abstract] Property and Equipment Property, Plant and Equipment Disclosure [Text Block] Commitment to purchase Other Commitment Bargain purchase gain recognized Business Combination, Bargain Purchase, Gain Recognized, Amount Less: Treasury stock, 740,708 and 211,139 shares as of December 31, 2020 and December 31, 2019, respectively, at cost Treasury Stock, Value Current liabilities: Liabilities, Current [Abstract] Federal statutory rate Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent Based on quoted market prices, aggregate fair value of ownership Equity Method Investment, Quoted Market Value Real estate and resort Real Estate And Resort [Member] Real Estate And Resort [Member] Number of business records Number Of Business Records Number Of Business Records Proceeds from line of credit Proceeds from Lines of Credit Recent Accounting Pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Discount Rate Measurement Input, Discount Rate [Member] Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Basic Earnings Per Share, Basic [Abstract]