Debt instrument, term of automatic extension Debt Instrument, Term Of Automatic Extension Debt Instrument, Term Of Automatic Extension Document Type Document Type Total other expense Disposal Group, Including Discontinued Operation, Other Expense Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Schedule of Variable Interest Entities Schedule of Variable Interest Entities [Table Text Block] Related Party [Axis] Related Party [Axis] Treasury Stock Treasury Stock [Member] Segments [Axis] Segments [Axis] Unrealized earnings (loss) of investments in unconsolidated affiliates Other comprehensive earnings — unrealized earnings 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 Level 3 Fair Value, Inputs, Level 3 [Member] Corporate Services Agreement Corporate Services Agreement [Member] Corporate Services Agreement Derivative contracts, at fair value Derivative Asset Corporate debt securities, with maturity of more than one year and less than five years Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five Coding Solutions Coding Solutions [Member] Coding Solutions [Member] Statistical Measurement [Domain] Statistical Measurement [Domain] LIABILITIES AND EQUITY Liabilities and Equity [Abstract] Line of Credit Loan Line of Credit [Member] Purchase Redeemable Warrants Forward Purchase Agreement, Purchase Redeemable Warrants [Member] Forward Purchase Agreement, Purchase Redeemable Warrants Debt securities held with previously recognized other than temporary impairment Available-for-sale, Amount Held with Previously Recognized Other Than Temporary Impairments Available-for-sale, Amount Held with Previously Recognized Other Than Temporary Impairments Subsidiary dividends paid to noncontrolling interests Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders Deferred tax liability Deferred Income Tax Liabilities, Net Personnel costs Labor and Related Expense Security Exchange Name Security Exchange Name Other intangible assets, net Intangible Assets, Net (Excluding Goodwill) Recognized loss Disposal Group, Including Discontinued Operation, Realized Gains (Losses) Disposal Group, Including Discontinued Operation, Realized Gains (Losses) DIP Loan converted to equity Debtor-in-Possession Financing, Loan Converted to Equity Debtor-in-Possession Financing, Loan Converted to Equity Trebia Trebia [Member] Trebia Borrowings Proceeds from Issuance of Long-term Debt Operating loss Operating income (loss) Operating Income (Loss) Total current liabilities Current liabilities Liabilities, Current Development Loan Notes Payable To Banks, Development Loan [Member] Notes Payable To Banks, Development Loan [Member] Contract Balances Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block] Prepaid expenses and other current assets Investment in Equity Fund, prepaid expense Prepaid Expense and Other Assets, Current NV Brasada FNF NV Brasada, LLC [Member] FNF NV Brasada, LLC [Member] Variable Rate [Domain] Variable Rate [Domain] Investments by Consolidated and Nonconsolidated Entities [Axis] Investments by Consolidated and Nonconsolidated Entities [Axis] Earnings before equity in (losses) earnings of unconsolidated affiliates (Loss) earnings before equity in earnings of unconsolidated affiliates Income (Loss) From Continuing Operations Before Minority Interest And Income (Loss) On Equity Method Investments, Net Of Income Tax Income (Loss) From Continuing Operations Before Minority Interest And Income (Loss) On Equity Method Investments, Net Of Income Tax Capital received in advance Capital Received In Advance Capital Received In Advance Variable Rate [Axis] Variable Rate [Axis] Unrealized earnings (losses) of investments in unconsolidated affiliates, income tax expense (benefit) Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) On Equity Method Investments Arising During Period, Tax Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) On Equity Method Investments Arising During Period, Tax Commitments and contingencies - see Note G Commitments and Contingencies Fixed maturity securities available for sale, at fair value Debt Securities, Available-for-sale, Noncurrent Treasury stock repurchases Payments for Repurchase of Common Stock ASSETS Assets [Abstract] Investment, Name [Axis] Investment, Name [Axis] DIP Loan DIP Loan [Member] DIP Loan Restricted Cash Cash and Cash Equivalents, Restricted Cash and Cash Equivalents, Policy [Policy Text Block] Entity Address, State or Province Entity Address, State or Province 2023 Long-Term Debt, Maturity, Year Three Retained earnings Retained Earnings (Accumulated Deficit) Noncontrolling interest - nonredeemable Nonredeemable Noncontrolling Interest Discount rate Debt Securities, Available-for-sale, Measurement Input Equity Method Investment, Financial Statement, Reported Amounts [Abstract] Equity Method Investment, Financial Statement, Reported Amounts [Abstract] Lease assets Operating Lease, Right-of-Use Asset Real estate and resort Real Estate And Resort [Member] Real Estate And Resort [Member] Other Other Investments In Unconsolidated Affiliates [Member] Other Investments In Unconsolidated Affiliates [Member] 2021 Lessee, Operating Lease, Liability, to be Paid, Year One Treasury stock repurchases (in shares) Treasury Stock, Shares, Acquired Corporate Services Agreement, term Corporate Services Agreement, Term Corporate Services Agreement, Term Equity: Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] 2024 Lessee, Operating Lease, Liability, to be Paid, Year Four 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] Corporate Services Agreement, notice of termination period Corporate Services Agreement, Notice of Termination Period Corporate Services Agreement, Notice of Termination Period Paid-in-kind dividends Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Issuances Beginning balance (in shares) Ending balance (in shares) Shares, Outstanding Preferred stock, 0.0001 par value; authorized 10,000,000 shares; issued and outstanding, none as of September 30, 2020 and December 31, 2019 Preferred Stock, Value, Issued Net earnings per share from continuing operations (in usd per share) Income (Loss) from Continuing Operations, Per Diluted Share Commitment to purchase, share price (in usd per share) Forward Purchase Agreement, Commitment to Purchase, Warrants, Share Price Forward Purchase Agreement, Commitment to Purchase, Warrants, Share Price Net loss per share from discontinued operations (in usd per share) Discontinued Operation, Income (Loss) from Discontinued Operation, Net of Tax, Per Diluted Share Investments in unconsolidated affiliates Additional investment Equity investment Payments to Acquire Equity Method Investments Other comprehensive earnings (loss), net of tax: Other Comprehensive Income (Loss), Net of Tax [Abstract] Gain on sale of stock by equity investee, tax expense Gain (Loss) On Sale of Previously Unissued Stock By Equity Investee, Tax Expense (Benefit) Gain (Loss) On Sale of Previously Unissued Stock By Equity Investee, Tax Expense (Benefit) Common stock, par value (in usd per share) Common Stock, Par or Stated Value Per Share Other non-current liabilities Other Liabilities, Noncurrent Deferred tax asset Deferred Income Tax Assets, Net Net other investing activities Payments for (Proceeds from) Other Investing Activities Optimal Blue Optimal Blue [Member] Optimal Blue Bakery sales Bakery Sales [Member] Bakery Sales [Member] Equity securities, at fair value - see Note A Equity Securities, FV-NI, Noncurrent Equity Securities, FV-NI, Noncurrent Stock-based compensation APIC, Share-based Payment Arrangement, Increase for Cost Recognition Inventory Inventory, Net Number of business records (more than) Number Of Business Records Number Of Business Records Total operating revenues Revenues from external customers Total operating revenues Revenue from Contract with Customer, Excluding Assessed Tax Equity Securities Investment, Policy [Policy Text Block] Earnings from continuing operations Net (loss) earnings from continuing operations Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest Franchise and other Franchise And Other [Member] Franchise And Other [Member] Business Acquisition [Axis] Business Acquisition [Axis] Statement [Line Items] Statement [Line Items] Change in deferred taxes Increase (Decrease) in Deferred Income Taxes Debt instrument, term Debt Instrument, Term Additions to notes receivable Payments to Acquire Notes Receivable Measurement Input Type [Domain] Measurement Input Type [Domain] Statement [Table] Statement [Table] Statistical Measurement [Axis] Statistical Measurement [Axis] Fixed-maturity securities available for sale: Investments, Fair Value Disclosure [Abstract] Credit Facility [Axis] Credit Facility [Axis] Preferred stock issued (in shares) Preferred Stock, Shares Issued Net proceeds from sales and maturities of short-term investment securities Payments for (Proceeds from) Short-term Investments Weighted Average Weighted Average [Member] Acquisition Loan, A Note Notes Payable To Banks, Acquisition Loan, A Note [Member] Notes Payable To Banks, Acquisition Loan, A Note [Member] Margin Facility Margin Loan Agreement Margin Loan Agreement [Member] Margin Loan Agreement [Member] Entity Small Business Entity Small Business Principles of Consolidation and Basis of Presentation Consolidation, Policy [Policy Text Block] Investments in unconsolidated affiliates Equity Method Investments [Member] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] QOMPLX QOMPLX, Inc. [Member] QOMPLX, Inc. [Member] Sale of stock (in shares) Sale of Stock, Number of Shares Issued in Transaction Notes Payable Debt Disclosure [Text Block] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Total operating revenues Disposal Group, Including Discontinued Operation, Revenue Proceeds from equity offering, net of offering expenses Proceeds from Issuance of Common Stock Debtor-in-possession financing to be provided Debtor-In-Possession Financing, Commitment To Fund Affiliate, Maximum Amount Debtor-In-Possession Financing, Commitment To Fund Affiliate, Maximum Amount Goodwill [Roll Forward] Goodwill [Roll Forward] Amendment Flag Amendment Flag Weighted Average Shares Outstanding Weighted Average Number of Shares Outstanding, Diluted [Abstract] 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] Amounts attributable to Cannae Holdings, Inc. common shareholders Income Amounts Attributable to Parent, Disclosures [Abstract] Summary of Changes in the Fair Values of Level 3 Assets Measured on a Recurring Basis Fair Value, Assets Measured on Recurring Basis [Table Text Block] Senator Focused Strategies Senator Focused Strategies [Member] Senator Focused Strategies Proceeds from issuance of equity Proceeds from Issuance of Private Placement Schedule of Investments and Equity in Earnings of Unconsolidated Affiliates Equity Method Investments [Table Text Block] Proceeds from Restaurant Group sale and leaseback of corporate office, net of issuance costs Proceeds From Sale Of Property Plant And Equipment, Leaseback, Finance Lease, Financing Activity Proceeds From Sale Of Property Plant And Equipment, Leaseback, Finance Lease, Financing Activity Net cash used in operating activities Net Cash Provided by (Used in) Operating Activities Subsidiary distributions paid to noncontrolling interest shareholders Payments of Ordinary Dividends, Noncontrolling Interest Entity Central Index Key Entity Central Index Key Related Party [Domain] Related Party [Domain] Related Party Transaction [Line Items] Related Party Transaction [Line Items] Revolving Line of Credit Two Revolving Line of Credit Two [Member] Revolving Line of Credit Two Proceeds from equity offering, net of offering expenses Cash Deconsolidated From Reorganization Cash Deconsolidated From Reorganization Financial Instruments [Domain] Financial Instruments [Domain] Maximum Exposure Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount Fair Value Measurement [Domain] Fair Value Measurement [Domain] Supplemental Cash Flow Information Cash Flow, Supplemental Disclosures [Text Block] 99 Revolver 99 Restaurants Credit Facility 99 Restaurants Credit Facility [Member] 99 Restaurants Credit Facility [Member] Segments [Domain] Segments [Domain] Cost Basis Debt Securities, Available-for-sale, Amortized Cost Senior Notes Due 2027 Senior Notes Due 2027 [Member] Senior Notes Due 2027 Unrealized Gains Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] 2024 Long-Term Debt, Maturity, Year Four Net valuation gain included in earnings Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Shares pledged as collateral, shares released (in shares) Debt Instrument, Shares Pledged As Collateral, Shares Released Debt Instrument, Shares Pledged As Collateral, Shares Released 2022 Lessee, Operating Lease, Liability, to be Paid, Year Two Indefinite-lived Intangible Assets [Line Items] Indefinite-lived Intangible Assets [Line Items] Maximum borrowing increment Line Of Credit Facility, Maximum Borrowing Increment Line Of Credit Facility, Maximum Borrowing Increment Cash flows from financing activities: Net Cash Provided by (Used in) Financing Activities [Abstract] Schedule of Carrying Amounts and Fair Values of Available for Sale Securities Schedule of Available-for-sale Securities Reconciliation [Table Text Block] Line of Credit Facility [Table] Line of Credit Facility [Table] 2023 Lessee, Operating Lease, Liability, to be Paid, Year Three Other assets Other Assets, Noncurrent Blue Ribbon American Blue Ribbon Holdings, LLC [Member] American Blue Ribbon Holdings, LLC [Member] Other liabilities Other Liabilities Segment Information Segment Reporting Disclosure [Text Block] Equity offering, net of offering costs Stock Issued During Period, Value, New Issues Reclassification adjustments for unrealized earnings 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 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 Net earnings from continuing operations attributable to Cannae Holdings, Inc. common shareholders Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent Foley Trasimene Acquisition Corp Foley Trasimene Acquisition Corp [Member] Foley Trasimene Acquisition Corp Total assets Assets Assets Impairment of intangible assets Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill) Title of 12(b) Security Title of 12(b) Security Disposal Group Classification [Axis] Disposal Group Classification [Axis] Dun And Bradstreet Corporation Dun & Bradstreet Dun And Bradstreet Corporation [Member] Dun And Bradstreet Corporation [Member] Loss from discontinued operations before income taxes Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax Net gains recognized during the period on equity securities Equity Securities, FV-NI, Gain (Loss) AmeriLife AmeriLife Joint Venture [Member] Equity Funding To AmeriLife Joint Venture [Member] Income taxes payable Accrued Income Taxes, Current Subsequent Event Type [Axis] Subsequent Event Type [Axis] Unrealized gain on investments and other financial instruments, net (excluding investments in unconsolidated affiliates) Other comprehensive earnings — unrealized gain on investments and other financial instruments, net of tax OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, after Tax Investments, Debt and Equity Securities [Abstract] Investments, Debt and Equity Securities [Abstract] Unrealized gain on investments and other financial instruments, income tax expense OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, Tax Interest expense Interest Expense Lease asset amortization Amortization of Leased Asset Proceeds from sale of stock Sale of Stock, Consideration Received on Transaction Depreciation and amortization Depreciation, Depletion and Amortization Collective voting interest with other equity sponsors (greater than) Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners Less: net gains recognized during the period on equity securities sold during the period Equity Securities, FV-NI, Unrealized Gain (Loss) Product and Service [Axis] Product and Service [Axis] Total liabilities Liabilities Investment Type [Axis] Investment Type [Axis] Supplemental Cash Flow Elements [Abstract] Supplemental Cash Flow Elements [Abstract] Less: discount Lessee, Operating Lease, Liability, Undiscounted Excess Amount 2022 Long-Term Debt, Maturity, Year Two Schedule of Related Party Transactions, by Related Party [Table] Schedule of Related Party Transactions, by Related Party [Table] Revenue recognized that was included in deferred revenue Contract with Customer, Liability, Revenue Recognized Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] Net loss Net Income (Loss) Available to Common Stockholders, Basic Level 1 Fair Value, Inputs, Level 1 [Member] Fair Value, Recurring and Nonrecurring [Table] Fair Value, Recurring and Nonrecurring [Table] Number of directors to be appointed Number of Directors Number of Directors Change in unrealized (loss) gain on securities and derivative contracts Unrealized Gain (Loss) on Derivatives Net loss per share from discontinued operations (in usd per share) Discontinued Operation, Income (Loss) from Discontinued Operation, Net of Tax, Per Basic Share Acquisition Loan, B Note Notes Payable To Banks, Acquisition Loan, B Note [Member] Notes Payable To Banks, Acquisition Loan, B Note [Member] Debt Instrument [Axis] Debt Instrument [Axis] Sale of noncontrolling interest in consolidated subsidiary Noncontrolling Interest, Increase from Sale of Parent Equity Interest Additional Paid-in Capital Additional Paid-in Capital [Member] Dividends attributable to preferred equity and noncontrolling interest expense Preferred Stock Dividends and Other Adjustments Assets: Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] Other assets Other Assets Operating Segments Operating Segments [Member] Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Asset Class [Axis] Asset Class [Axis] Treasury stock repurchases Treasury Stock, Value, Acquired, Cost Method Adjustments to reconcile net earnings to net cash used in operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Net earnings per share from continuing operations (in usd per share) Income (Loss) from Continuing Operations, Per Basic Share Revenue from Contract with Customer [Abstract] Revenue from Contract with Customer [Abstract] Restaurant Group Restaurant Group [Member] Restaurant Group [Member] Common stock outstanding (in shares) Common Stock, Shares, Outstanding Investments in unconsolidated affiliates Investment in partnership Equity Method Investments Thereafter Lessee, Operating Lease, Liability, to be Paid, after Year Four Lessee, Operating Lease, Liability, to be Paid, after Year Four Recognized gains and losses, net Recognized gains Nonoperating Gains (Losses) Schedule of Goodwill [Table] Schedule of Goodwill [Table] Revolving credit facility Revolver Note Revolving Credit Facility [Member] Variable Interest Entities Variable Interest Entity Disclosure [Text Block] Loss before income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Revenues: Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract] IPO IPO [Member] Variable Interest Entity, Not Primary Beneficiary Variable Interest Entity, Not Primary Beneficiary [Member] Subsequent Event Subsequent Event [Member] Total operating expenses Disposal Group, Including Discontinued Operation, Operating Expense Notes payable to banks Notes Payable to Banks [Member] Common stock authorized (in shares) Common Stock, Shares Authorized Summary of Financial Information Concerning Reportable Segments Schedule of Segment Reporting Information, by Segment [Table Text Block] 2021 Recorded Unconditional Purchase Obligation, to be Paid, Year One 99 Restaurants Ninety-Nine Restaurants [Member] Ninety-Nine Restaurants [Member] Condensed Consolidated Statements of Operations Income Statement [Abstract] Accumulated Other Comp (Loss) Earnings AOCI Attributable to Parent [Member] Lease liabilities, long term Operating lease liability as of September 30, 2020, long term Operating Lease, Liability, Noncurrent Over-Allotment Option Over-Allotment Option [Member] Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Disposal Groups, Including Discontinued Operations [Table] Disposal Groups, Including Discontinued Operations [Table] Corporate Services Agreement, standard allocation, plus additional percentage Corporate Services Agreement, Standard Allocation, Additional Percentage Corporate Services Agreement, Standard Allocation, Additional Percentage Management Estimates Use of Estimates, Policy [Policy Text Block] Current assets: Assets, Current [Abstract] Number of shares called by each warrant Forward Purchase Agreement, Common Stock, Number Of Securities Called By Each Warrant or Right Forward Purchase Agreement, Common Stock, Number Of Securities Called By Each Warrant or Right Comprehensive earnings attributable to Cannae Holdings, Inc. Comprehensive Income (Loss), Net of Tax, Attributable to Parent Preferred stock par value (in usd per share) Preferred Stock, Par or Stated Value Per Share 2021 Long-Term Debt, Maturity, Year One Management Services Agreement, fees earned Management Services Agreement, Fees Earned [Member] Management Services Agreement, Fees Earned Counterparty Name [Domain] Counterparty Name [Domain] Legal Entity [Axis] Legal Entity [Axis] City Area Code City Area Code Consolidation Items [Domain] Consolidation Items [Domain] Due from brokers and counterparties Receivables from Brokers-Dealers and Clearing Organizations Document Period End Date Document Period End Date Goodwill and Other Intangible Assets Goodwill and Intangible Assets Disclosure [Text Block] 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] Equity in earnings (losses) of unconsolidated affiliates Equity in (earnings) losses of unconsolidated affiliates Equity in earnings (losses) from equity investments Income (Loss) from Equity Method Investments Net earnings Net loss Net earnings Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Disaggregation of Revenue Disaggregation of Revenue [Table Text Block] Earnings before income taxes and equity in (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 99 DLOC Loan 99 DLOC Loan Development Line Of Credit Loan [Member] Development Line Of Credit Loan [Member] Corporate services Agreement, renewal term Corporate Services Agreement, Renewal Term Corporate Services Agreement, Renewal Term Thereafter Recorded Unconditional Purchase Obligation, to be Paid, After Year Four Recorded Unconditional Purchase Obligation, to be Paid, After Year Four Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Notes payable Notes Payable, Other Payables [Member] Member's equity Members' Equity Long-term Debt, Type [Domain] Long-term Debt, Type [Domain] Stock-based compensation cost Share-based Payment Arrangement, Noncash Expense Additions to property and equipment and other intangible assets Payments to Acquire Productive Assets Equity investment Equity Securities: Equity Securities, FV-NI 2020 (remaining) Long-Term Debt, Maturity, Remainder of Fiscal Year Entity [Domain] Entity [Domain] Cover [Abstract] Cover [Abstract] Base Rate Base Rate [Member] Measurement Input Type [Axis] Measurement Input Type [Axis] 2023 Recorded Unconditional Purchase Obligation, to be Paid, Year Three Distributions from investments in unconsolidated affiliates Proceeds from Equity Method Investment, Distribution Equity Method Investee Equity Method Investee [Member] Total member's equity Limited Liability Company (LLC) Members' Equity, Including Portion Attributable to Noncontrolling Interest Unrealized gain upon change in accounting Equity Securities, FV-NI, Unrealized Gain Goodwill [Line Items] Goodwill [Line Items] Long-term debt Long-term debt Notes payable, total Long-term debt Long-term Debt Affiliated Entity Affiliated Entity [Member] Leases Lessee, Operating Leases [Text Block] Revolving Line of Credit One Revolving Line of Credit One [Member] Revolving Line of Credit One Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] Fair value, beginning of period Fair value, end of period Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value Cost of restaurant revenue Cost of Goods and Services Sold Corporate debt securities Fair Value Debt Securities, Available-for-sale 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 Net loss from discontinued operations attributable to Cannae Holdings, Inc. common shareholders Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent Total operating expenses Costs and Expenses Change in net assets from operations Investment Company, Net Assets from Operations, Increase (Decrease) Equity Components [Axis] Equity Components [Axis] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Minimum Minimum [Member] Other than temporary impairment of investment Equity Method Investment, Other than Temporary Impairment Lease liabilities, current Less: operating lease liability as of September 30, 2020, current Operating Lease, Liability, Current Schedule of Supplemental Cash Flow information Schedule of Cash Flow, Supplemental Disclosures [Table Text Block] Less: Net loss attributable to non-controlling interests Income attributable to noncontrolling interests Net Income (Loss) Attributable to Noncontrolling Interest Entity Interactive Data Current Entity Interactive Data Current Revenues: Revenues [Abstract] Fair Value Measurements Fair Value Disclosures [Text Block] Cash flows from operating activities: Net Cash Provided by (Used in) Operating Activities [Abstract] Cumulative Effect, Period of Adoption, Adjustment Cumulative Effect, Period of Adoption, Adjustment [Member] Entity Registrant Name Entity Registrant Name 2022 Recorded Unconditional Purchase Obligation, to be Paid, Year Two Subsequent Event Type [Domain] Subsequent Event Type [Domain] Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Forward Purchase Agreements Forward Purchase Agreement, Purchase of Common Stock [Member] Forward Purchase Agreement, Purchase of Common Stock Dun & Bradstreet and Optimal Blue Elimination Intersegment Eliminations [Member] Management fee expenses Management Fee Expense Other operating expenses Other Cost and Expense, Operating Proceeds from sales of property and equipment Proceeds from Sale of Property, Plant, and Equipment Distribution of shares received (in shares) Equity Method Investment, Distribution, Shares Received Equity Method Investment, Distribution, Shares Received Net decrease (increase) in 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 Schedule of Equity Method Investments [Table] Schedule of Equity Method Investments [Table] Variable rate interest Debt Instrument, Interest Rate, Effective Percentage Consolidation Items [Axis] Consolidation Items [Axis] Financing arranged Debtor-in-Possession Financing, Amount Arranged Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Goodwill impairment Goodwill impairment Goodwill, Impairment Loss Trade receivables Accounts Receivable, after Allowance for Credit Loss, Current Total lease payments, undiscounted Lessee, Operating Lease, Liability, to be Paid Depreciation and amortization Depreciation, Depletion and Amortization, Nonproduction Impairment Other-than-temporary impairment charges related to corporate debt securities Other-than-temporary Impairment Loss, Debt Securities, Available-for-sale Unrealized Losses Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax Sale of Stock [Axis] Sale of Stock [Axis] Entity Address, Postal Zip Code Entity Address, Postal Zip Code Purchase Obligations Recorded Unconditional Purchase Obligations [Table Text Block] Depreciation and amortization Disposal Group, Including Discontinued Operation, Depreciation and Amortization Other Other [Member] Other Goodwill Goodwill Balance, December 31, 2019 Balance, September 30, 2020 Goodwill Debt Securities, Available-for-sale [Line Items] Debt Securities, Available-for-sale [Line Items] Corporate debt securities, with maturity of less than one year Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, Year One CoreLogic CoreLogic, Inc. [Member] CoreLogic, Inc. Document Transition Report Document Transition Report Purchases of other long term investments Payments to Acquire Long-term Investments Net change in income taxes Increase (Decrease) in Income Taxes Payable Other income (expense): Nonoperating Income (Expense) [Abstract] Notes, face amounts Debt Instrument, Face Amount Unrealized gains recognized during the reporting period on equity securities still held at the reporting date Equity Securities, FV-NI, Realized Gain (Loss) Level 2 Fair Value, Inputs, Level 2 [Member] Document Quarterly Report Document Quarterly Report Schedule of Goodwill Schedule of Goodwill [Table Text Block] Asset Class [Domain] Asset Class [Domain] Total 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] Gain (Loss) on Securities Gain (Loss) on Securities [Table Text Block] Equity securities, FV-NI, ownership percentage Equity Securities, FV-NI, Ownership Percentage Equity Securities, FV-NI, Ownership Percentage Deferred revenue Contract with Customer, Liability, Current D & B Private Placement D & B Private Placement [Member] D & B Private Placement Cumulative Effect, Period of Adoption [Axis] Cumulative Effect, Period of Adoption [Axis] Credit Facility [Domain] Credit Facility [Domain] Weighted average shares outstanding Cannae Holdings common stock, diluted basis (in shares) Weighted Average Number of Shares Outstanding, Diluted Net earnings per share (in usd per share) Earnings Per Share, Basic Number of revolving lines of credit Number of Revolving Credit Facilities Number of Revolving Credit Facilities Schedule of Indefinite-Lived Intangible Assets [Table] Schedule of Indefinite-Lived Intangible Assets [Table] Other operating revenue Total other operating revenue Total Other Operating Revenue [Member] Total Other Operating Revenue [Member] Entity File Number Entity File Number Debt Disclosure [Abstract] Debt Disclosure [Abstract] Net losses from discontinued operations, net of tax - see Note L Loss from discontinued operations Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest Reconciliation of Operations Disposal Groups, Including Discontinued Operations [Table Text Block] Net cash provided by financing activities Net Cash Provided by (Used in) Financing Activities Sale of noncontrolling interest in consolidated subsidiary Proceeds from Noncontrolling Interests Debt service payments Repayment of debt Repayments of Long-term Debt Counterparty Name [Axis] Counterparty Name [Axis] Investments by Consolidated and Nonconsolidated Entities [Domain] Investments by Consolidated and Nonconsolidated Entities [Domain] Cannae common stock, 0.0001 par value; authorized 115,000,000 shares as of September 30, 2020 and December 31, 2019; outstanding of 91,656,245 and 79,516,833 shares as of September 30, 2020 and December 31, 2019, respectively, and issued of 92,377,972 and 79,727,972 shares as of September 30, 2020 and December 31, 2019, respectively Common Stock, Value, Issued Disposal Group Name [Axis] Disposal Group Name [Axis] Goodwill and Intangible Assets Disclosure [Abstract] Goodwill and Intangible Assets Disclosure [Abstract] Document Fiscal Year Focus Document Fiscal Year Focus Notes payable, current Less: Notes payable, current Long-term Debt, Current Maturities Entity Current Reporting Status Entity Current Reporting Status Sale of stock, price per share (in usd per share) Sale of Stock, Price Per Share Interest, investment and other income Investment Income, Interest and Dividend 2024 Recorded Unconditional Purchase Obligation, to be Paid, Year Four Investments Excluding Dun & Bradstreet Investments Excluding Dun & Bradstreet [Member] Investments Excluding Dun & Bradstreet [Member] Goodwill and other intangible assets, net Intangible Assets, Net (Including Goodwill) Related Party Transaction [Axis] Related Party Transaction [Axis] Proceeds from sale of investments in unconsolidated affiliates and other long term investments Proceeds from Sale of Equity Method Investments Thereafter Long-Term Debt, Maturity, after Year Four Long-Term Debt, Maturity, after Year Four Earnings Per Share Earnings Per Share, Policy [Policy Text Block] Deconsolidation of Blue Ribbon Goodwill, Decrease Related To Deconsolidation Goodwill, Decrease Related To Deconsolidation Comprehensive earnings Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Schedule of Long-term Debt Instruments [Table] Schedule of Long-term Debt Instruments [Table] Noncontrolling interests Stockholders' Equity Attributable to Noncontrolling Interest Equity Method Investment, Nonconsolidated Investee [Domain] Equity Method Investment, Nonconsolidated Investee [Domain] Acquisition, share price (in usd per share) Business Acquisition, Share Price Preferred equity Temporary Equity, Carrying Amount, Including Portion Attributable to Noncontrolling Interests Cash flows from investing activities: Net Cash Provided by (Used in) Investing Activities [Abstract] Common stock issued (in shares) Common Stock, Shares, Issued Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Accrual for legal proceedings Estimated Litigation Liability Net decrease in lease liabilities Increase (Decrease) In Lease Liabilities Increase (Decrease) In Lease Liabilities Owned investment (in shares) Investment Owned, Balance, Shares 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] Total operating lease liability as of September 30, 2020, at present value Operating Lease, Liability Subsidiary or Equity Method Investee, Sale of Stock by Subsidiary or Equity Investee [Table] Subsidiary or Equity Method Investee, Sale of Stock by Subsidiary or Equity Investee [Table] Contribution 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, net Accounts Receivable, after Allowance for Credit Loss Segment Reporting [Abstract] Segment Reporting [Abstract] Net decrease in trade receivables Increase (Decrease) in Accounts Receivable Operating leases Cash Paid For Operating Leases Cash Paid For Operating Leases Debt Instrument [Line Items] Debt Instrument [Line Items] Condensed Consolidated Statements of Comprehensive Earnings Statement of Comprehensive Income [Abstract] Total Cannae shareholders' equity Stockholders' Equity Attributable to Parent Total liabilities and equity Liabilities and Equity O'Charley's O'Charley's [Member] O'Charley's Loss Contingencies [Line Items] Loss Contingencies [Line Items] Accumulated other comprehensive earnings (loss) Accumulated Other Comprehensive Income (Loss), Net of Tax Entity Address, City or Town Entity Address, City or Town Portion at Fair Value Measurement Portion at Fair Value Measurement [Member] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Accounts payable and other accrued liabilities, current Accounts Payable and Accrued Liabilities, Current Financial Instrument [Axis] Financial Instrument [Axis] Antidilutive shares excluded from calculation of diluted earnings per share (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Gain on sale of stock by equity investee Gain (Loss) on Sale of Previously Unissued Stock by Equity Investee Line of Credit Facility [Line Items] Line of Credit Facility [Line Items] FNF Revolver Corporate Revolver Note [Member] Corporate Revolver Note [Member] Indefinite-lived Intangible Assets [Axis] Indefinite-lived Intangible Assets [Axis] Equity Component [Domain] Equity Component [Domain] Restaurant Group reorganization and deconsolidation of Blue Ribbon Stockholders' Equity, Increase (Decrease) From Reorganization And Deconsolidation Of Subsidiary Stockholders' Equity, Increase (Decrease) From Reorganization And Deconsolidation Of Subsidiary Condensed Combined Balance Sheets Investments in Unconsolidated Affiliates Equity Method Investment, Summarized Financial Information [Abstract] Equity Method Investment, Nonconsolidated Investee [Axis] Equity Method Investment, Nonconsolidated Investee [Axis] Schedule of Available-for-sale Securities [Table] Schedule of Available-for-sale Securities [Table] Property and equipment, net Property, Plant and Equipment, Net DIP Loan Debtor-In-Possession Financing, Loan Receivable Debtor-In-Possession Financing, Loan Receivable Entity Tax Identification Number Entity Tax Identification Number Revenue Recognition Revenue from Contract with Customer [Policy Text Block] Ownership interest after sale (as a percent) Discontinued Operation, Equity Method Investment Retained after Disposal, Ownership Interest after Disposal 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] Fixed maturity securities available for sale: Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract] Schedule of Variable Interest Entities [Table] Schedule of Variable Interest Entities [Table] 2020 (remaining) Lessee, Operating Lease, Liability, to be Paid, Remainder of Fiscal Year LIBOR London Interbank Offered Rate (LIBOR) [Member] Investment, Name [Domain] Investment, Name [Domain] Other comprehensive earnings Other Comprehensive Income (Loss), Net of Tax Trade Names Trade Names [Member] Net assets Net Assets Leases [Abstract] Leases [Abstract] 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, income tax benefit Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax Commitment to purchase, shares, warrants (in shares) Forward Purchase Agreement, Commitment to Purchase, Shares Forward Purchase Agreement, Commitment to Purchase, Shares Long-term Debt, Type [Axis] Long-term Debt, Type [Axis] Total current assets Total current assets Assets, Current Current Fiscal Year End Date Current Fiscal Year End Date Corporate and Other Corporate and Other [Member] Operating expenses: Operating Expenses [Abstract] Less: Comprehensive loss attributable to noncontrolling interests Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest Earnings per share Earnings Per Share [Abstract] T-System Holdings, Inc. T-System Holdings, Inc. [Member] T-System Holdings, Inc. [Member] Equity in Losses of Unconsolidated Affiliates Investment Company, Net Assets from Operations, Increase (Decrease) [Abstract] Realized gain on securities and derivative contracts Realized Gain (Loss) on Securities And Derivatives Realized Gain (Loss) on Securities And Derivatives Disposal Group Name [Domain] Disposal Group Name [Domain] Document Fiscal Period Focus Document Fiscal Period Focus Notes receivable Notes Receivable [Member] Subsidiary, Sale of Stock [Line Items] Subsidiary, Sale of Stock [Line Items] Equity Sponsors Equity Sponsors [Member] Equity Sponsors Operating expenses: Disposal Group, Including Discontinued Operation, Operating Expense [Abstract] Disposal Group, Including Discontinued Operation, Operating Expense [Abstract] Accounts payable and other accrued liabilities, long term Accounts Payable and Accrued Liabilities, Noncurrent Cash paid during the period: Supplemental Cash Flow Information [Abstract] Unconsolidated affiliates Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member] Other long term investments and non-current assets Investments and Other Noncurrent Assets Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] Personnel costs Disposal Group, Including Discontinued Operation, Labor And Related Expense Disposal Group, Including Discontinued Operation, Labor And Related Expense Funds Held on Deposit with Equity Fund Funds Held on Deposit with Equity Fund [Member] Funds Held on Deposit with Equity Fund Foley Trasimene Acquisition Corp. II Foley Trasimene Acquisition Corp. II [Member] Foley Trasimene Acquisition Corp. II Entity Filer Category Entity Filer Category Common Stock Forward Purchase Agreement Common Stock [Member] Product and Service [Domain] Product and Service [Domain] Distributions from investments in unconsolidated affiliates Proceeds from Equity Method Investment, Distribution, Return of Capital Other operating revenue Disposal Group, Including Discontinued Operation, Other Operating Revenue Disposal Group, Including Discontinued Operation, Other Operating Revenue Other Commitments [Axis] Other Commitments [Axis] Other Commitments [Domain] Other Commitments [Domain] Net increase in inventory, prepaid expenses and other assets Increase (Decrease) In Inventories, Prepaid Expense And Other Assets Increase (Decrease) In Inventories, Prepaid Expense And Other Assets Amount available to be drawn Line of Credit Facility, Remaining Borrowing Capacity Equity offering, net of offering costs (in shares) Stock Issued During Period, Shares, New Issues Acquisition Loan Notes Payable To Banks, Acquisition Loan [Member] Notes Payable To Banks, Acquisition Loan [Member] Discontinued Operations, Held-for-sale Discontinued Operations, Held-for-sale [Member] Schedule of Equity Method Investments [Line Items] Schedule of Equity Method Investments [Line Items] Interest rate Debt Instrument, Interest Rate, Stated Percentage Other Other Products And Services [Member] Other Products And Services [Member] Ceridian Ceridian Ceridian [Member] Ceridian [Member] Diluted Earnings Per Share, Diluted [Abstract] Net decrease in cash and cash equivalents Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Total other income Nonoperating Income (Expense) 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 Lessee, Operating Lease, Liability, Maturity [Table Text Block] Weighted average shares outstanding Cannae Holdings common stock, basic basis (in shares) Weighted Average Number of Shares Outstanding, Basic Interest rate basis Debt Instrument, Basis Spread on Variable Rate Ownership [Axis] Ownership [Axis] Treasury shares (in shares) Treasury Stock, Shares Sale of Stock [Domain] Sale of Stock [Domain] Loss Contingencies [Table] Loss Contingencies [Table] Ownership [Domain] Ownership [Domain] Carrying Value Reported Value Measurement [Member] Revenue Recognition Revenue from Contract with Customer [Text Block] Interest Interest Paid, Excluding Capitalized Interest, Operating Activities Outstanding voting equity Ownership interest, equity method investment Ownership percentage Equity Method Investment, Ownership Percentage Investment without readily determinable fair value Equity Securities without Readily Determinable Fair Value, Amount Total equity Beginning balance Ending balance Total equity Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Cannae and Other Investors Cannae, THL And Other Investors [Member] Cannae, THL And Other Investors [Member] Basis of Financial Statements Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Additional paid-in capital Additional Paid in Capital Total revenues Total revenues and other income Revenues Income tax expense Income tax (benefit) expense Income Tax Expense (Benefit) Other Other Notes Payable [Member] Other Notes Payable [Member] Income taxes Income Taxes Paid, Net Shares pledged as collateral (in shares) Debt Instrument, Shares, Pledged As Collateral Debt Instrument, Shares, Pledged As Collateral 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 Recognized gains and losses and asset impairments, net Gain (Loss) on Sale of Assets and Asset Impairment Charges Gross Principal Maturities of Notes Payable Schedule of Maturities of Long-term Debt [Table Text Block] Indefinite-lived Intangible Assets, Major Class Name [Domain] Indefinite-lived Intangible Assets, Major Class Name [Domain] Net earnings per share (in usd per share) Earnings Per Share, Diluted Variable Interest Entity [Line Items] Variable Interest Entity [Line Items] Proceeds from partial sale of Ceridian shares - see Note A Proceeds from Sale of Debt Securities, Available-for-sale Local Phone Number Local Phone Number Total purchase commitments Recorded Unconditional Purchase Obligation 2020 (remaining) Recorded Unconditional Purchase Obligation, to be Paid, Remainder of Fiscal Year Cumulative Effect, Period of Adoption [Domain] Cumulative Effect, Period of Adoption [Domain] Operating loss Disposal Group, Including Discontinued Operation, Operating Income (Loss) Distribution of shares owned , increased ownership Equity Method Investment, Distribution of Shares Owned Equity Method Investment, Distribution of Shares Owned Reclassification adjustments for unrealized earnings 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 Income tax expense (benefit) Discontinued Operation, Tax Effect of Discontinued Operation Total net investment loss Interest, investment and other income, including recognized gains and losses, net Investment Income, Net Total Long Term Debt Long-term Debt, Gross Schedule of Notes Payable Schedule of Long-term Debt Instruments [Table Text Block] Entity Address, Address Line One Entity Address, Address Line One Deferred revenue (contract liabilities) Contract with Customer, Liability Related Party Transaction [Domain] Related Party Transaction [Domain] Entity Emerging Growth Company Entity Emerging Growth Company Other operating expenses Disposal Group, Including Discontinued Operation, Other Operating Expense Disposal Group, Including Discontinued Operation, Other Operating Expense Management services agreement, renewal term Management Services Agreement, Renewal Term Management Services Agreement, Renewal Term Aggregate borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Consolidated Entity Consolidated Entity Excluding Variable Interest Entities (VIE) [Member] Maximum Maximum [Member] Preferred stock authorized (in shares) Preferred Stock, Shares Authorized Term Loan Term Loan [Member] Term Loan Non-controlling Interests Noncontrolling Interest [Member] Restricted cash Restricted Cash Retained Earnings Retained Earnings [Member] Preferred stock outstanding (in shares) Preferred Stock, Shares Outstanding Measurement Basis [Axis] Measurement Basis [Axis] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Effective tax rate Effective Income Tax Rate Reconciliation, Percent Net cash used in investing activities Net Cash Provided by (Used in) Investing Activities Management services agreement, term Management Services Agreement, Term Management Services Agreement, Term Investments [Domain] Investments [Domain] Corporate debt securities Corporate Debt Securities [Member] Trading Symbol Trading Symbol Brasada Interstate Loans Brasada Credit Agreement Brasada Credit Agreement [Member] Brasada Credit Agreement [Member] Discontinued Operations and Disposal Groups [Abstract] Discontinued Operations and Disposal Groups [Abstract] Disposal Group Classification [Domain] Disposal Group Classification [Domain] Commitment to purchase Other Commitment Restaurant revenue Restaurant sales Restaurant Sales [Member] Restaurant Sales [Member] Less: Treasury stock, 721,727 and 211,139 shares as of September 30, 2020 and December 31, 2019, respectively, at cost Treasury Stock, Value Organization, Consolidation and Presentation of Financial Statements [Abstract] Organization, Consolidation and Presentation of Financial Statements [Abstract] Black Knight, Inc. Black Knight, Inc. [Member] Black Knight, Inc. Current liabilities: Liabilities, Current [Abstract] Entity Shell Company Entity Shell Company Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Aggregate value of ownership based on quoted market price Equity Method Investment, Quoted Market Value 99 Term Loan 99 Term Loan 99 Term Loan [Member] 99 Term Loan [Member] 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] Short-term investments Short-term Investments