v3.26.1
Cover - shares
 6 Months Ended
Jun. 30, 2026
Aug. 11, 2026
Document Information [Line Items]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Jun. 30, 2026  
Document Transition Report false  
Entity File Number 001-42813  
Entity Registrant Name MOUNT LOGAN CAPITAL INC.  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 33-2698952  
Entity Address, Address Line One 650 Madison Ave, 3rd Floor  
Entity Address, City or Town New York  
Entity Address, State or Province NY  
Entity Address, Postal Zip Code 10022  
City Area Code 212  
Local Phone Number 891-2880  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Non-accelerated Filer  
Entity Small Business true  
Entity Emerging Growth Company true  
Entity Ex Transition Period false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   11,188,768
Amendment Flag false  
Document Fiscal Year Focus 2026  
Document Fiscal Period Focus Q2  
Entity Central Index Key 0002051820  
Current Fiscal Year End Date --12-31  
Common Stock    
Document Information [Line Items]    
Title of 12(b) Security Common Stock, $0.001 par value  
Trading Symbol MLCI  
Security Exchange Name NASDAQ  
Senior Notes Due 2031    
Document Information [Line Items]    
Title of 12(b) Security 8.00% Senior Notes Due 2031  
Trading Symbol MLCIL  
Security Exchange Name NASDAQ