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Recovery, Explanation of Impracticability [Text Block] Commitment obligations Other Commitment Contract Balances Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block] Difference between the historical cost of treasury stock and fair value upon reissuance for investment in JANA Noncash, Increase (Decrease) Treasury Stock, Historical Costs And Fair Value At Reissuance Noncash, Increase (Decrease) Difference Treasury Stock, Historical Costs And Fair Value At Reissuance Other Other Notes Payable [Member] Other Notes Payable [Member] Operating expenses: Operating Expenses [Abstract] Revenue Recognition Revenue from Contract with Customer [Text Block] Company Selected Measure Amount Company Selected Measure Amount Additional Paid-in Capital Additional Paid-in Capital [Member] MSA termination fee annual installments, payment period Management Services Agreement, Termination Fee Annual Installments, Payment Period Management Services Agreement, Termination Fee Annual Installments, Payment Period Unrealized gains (losses) recognized during the reporting period on equity securities held at the reporting date Equity Securities, FV-NI, Realized Gain (Loss) Total assets Assets Assets Name Awards Close in Time to MNPI Disclosures, Individual Name 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 Share Repurchase Program [Axis] Share Repurchase Program [Axis] Cover [Abstract] Cover [Abstract] Reclassification adjustments for unrealized gains and losses on unconsolidated affiliates, net of tax, included in net earnings Reclassification adjustments for unrealized gains and losses on unconsolidated affiliates, net of tax, included in net earnings (loss) Other Comprehensive Income Loss Reclassification Adjustment For Net Unrealized Gains Losses On Unconsolidated Affiliates, Net Of Tax, Include Net Earnings Other Comprehensive Income Loss Reclassification Adjustment For Net Unrealized Gains Losses On Unconsolidated Affiliates, Net Of Tax, Include Net Earnings Stock-based compensation APIC, Share-Based Payment Arrangement, Increase for Cost Recognition Personnel costs Labor and Related Expense Treasury shares issued for investment in JANA Stock Issued During Period, Value, Purchase of Assets Other non-current liabilities Other Liabilities, Noncurrent Non-NEOs Non-NEOs [Member] Schedule of Supplemental Cash Flow information Schedule of Cash Flow, Supplemental Disclosures [Table Text Block] Underwritten Secondary Public Offering Underwritten Secondary Public Offering [Member] Underwritten Secondary Public Offering [Member] Segment Information Segment Reporting Disclosure [Text Block] Net increase (decrease) in cash and cash equivalents Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Cash flows from financing activities: Net Cash Provided by (Used in) Financing Activities [Abstract] (Loss) earnings before income taxes and equity in losses 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 Non-PEO NEO Non-PEO NEO [Member] Equity Component [Domain] Equity Component [Domain] Adjustment to Compensation: Adjustment to Compensation [Axis] Option to increase limit Line of Credit Facility, Accordion Feature, Increase Limit Line of Credit Facility, Accordion Feature, Increase Limit 2020 Margin Facility 2020 Margin Facility [Member] 2020 Margin Facility Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] Debt Instrument [Line Items] Debt Instrument [Line Items] Weighted average shares outstanding Cannae Holdings common stock, basic basis (in shares) Weighted Average Number of Shares Outstanding, Basic Entity Current Reporting Status Entity Current Reporting Status Operating loss Operating income Operating Income (Loss) Revenues: Revenues [Abstract] Consolidated Entities [Domain] Consolidated Entities [Domain] Restaurant revenue Restaurant sales Restaurant Sales [Member] Restaurant Sales [Member] Related Party Transaction [Axis] Related Party Transaction [Axis] Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Segments [Axis] Segments [Axis] Statement [Line Items] Statement [Line Items] Other comprehensive earnings (loss), net of tax: Other Comprehensive Income (Loss), Net of Tax [Abstract] Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Line of credit outstanding balance Long-Term Line of Credit Equity: Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] Non-controlling Interests Noncontrolling Interest [Member]