v3.25.2
Cover - shares
6 Months Ended
Jun. 30, 2025
Aug. 08, 2025
Cover [Abstract]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Jun. 30, 2025  
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 Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Large Accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   56,014,815
Amendment Flag false  
Document Fiscal Year Focus 2025  
Document Fiscal Period Focus Q2  
Entity Central Index Key 0001704720  
Current Fiscal Year End Date --12-31