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Cover
Dec. 12, 2025
Dec. 31, 2024
Cover [Abstract]    
Document Type 8-K  
Document Period End Date Dec. 12, 2025  
Entity Registrant Name Cannae Holdings, Inc.  
Entity File Number 1-38300  
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  
Written Communications false  
Soliciting Material false  
Pre-commencement Tender Offer false  
Pre-commencement Issuer Tender Offer false  
Title of 12(b) Security Cannae Common Stock, $0.0001 par value  
Trading Symbol CNNE  
Security Exchange Name NYSE  
Entity Emerging Growth Company false  
Entity Central Index Key 0001704720  
Amendment Flag false  
Current Fiscal Year End Date   --12-31