v3.26.1

Cover - USD ($)	12 Months Ended
Cover - USD ($)	Dec. 31, 2025	Feb. 20, 2026	Jun. 30, 2025
Cover [Abstract]
Document Type	10-K/A
Document Annual Report	true
Document Period End Date	Dec. 31, 2025
Current Fiscal Year End Date	--12-31
Document Transition Report	false
Entity File Number	1-38300
Entity Registrant Name	CANNAE HOLDINGS, INC.
Entity Incorporation, State or Country Code	NV
Entity Tax Identification Number	82-1273460
Entity Address, Address Line One	1701 Village Center Circle,
Entity Address, City or Town	Las Vegas,
Entity Address, State or Province	NV
Entity Address, Postal Zip Code	89134
City Area Code	702
Local Phone Number	323-7330
Title of 12(b) Security	Cannae Common Stock, $0.0001 par value
Trading Symbol	CNNE
Security Exchange Name	NYSE
Entity Well-Known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	true
Document Financial Statement Error Correction [Flag]	false
Entity Shell Company	false
Entity Public Float			$ 1,061,691,612
Entity Common Stock, Shares Outstanding		44,220,506
Amendment Flag	true
Amendment Description	This Amendment No. 1 (the "Amendment") on Form 10-K/A is being filed with respect to the Registrant’s Annual Report on Form 10-K for the fiscal year ended December 31, 2025 filed with the Securities and Exchange Commission on March 2, 2026 (the "Form 10-K"). This Amendment updates Part III in its entirety to contain the information required therein. Except for the changes to Part III and the filing of related certifications added to the list of Exhibits in Part IV, this Amendment makes no changes to the Form 10-K. This Amendment does not reflect events occurring after the filing of the Form 10-K or modify disclosures affected by subsequent events.
Document Fiscal Year Focus	2025
Document Fiscal Period Focus	FY
Entity Central Index Key	0001704720

Description of changes contained within amended document.

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Indicate number of shares or other units outstanding of each of registrant's classes of capital or common stock or other ownership interests, if and as stated on cover of related periodic report. Where multiple classes or units exist define each class/interest by adding class of stock items such as Common Class A [Member], Common Class B [Member] or Partnership Interest [Member] onto the Instrument [Domain] of the Entity Listings, Instrument.

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Commission file number. The field allows up to 17 characters. The prefix may contain 1-3 digits, the sequence number may contain 1-8 digits, the optional suffix may contain 1-4 characters, and the fields are separated with a hyphen.

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The aggregate market value of the voting and non-voting common equity held by non-affiliates computed by reference to the price at which the common equity was last sold, or the average bid and asked price of such common equity, as of the last business day of the registrant's most recently completed second fiscal quarter.

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Cannae Holdings, Inc. 10-K/A