Cover - USD ($) $ in Thousands	12 Months Ended
Cover - USD ($) $ in Thousands	Dec. 31, 2025	Mar. 17, 2026	Jun. 30, 2025
Document Information [Line Items]
Document Type	10-K
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	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 Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
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
ICFR Auditor Attestation Flag	true
Entity Shell Company	false
Document Financial Statement Error Correction [Flag]	false
Entity Common Stock, Shares Outstanding		11,196,169
Documents Incorporated by Reference	DOCUMENTS INCORPORATED BY REFERENCE Portions of the Definitive Proxy Statement for the registrant’s 2026 Annual Meeting of Stockholders, expected to be filed pursuant to Regulation 14A within 120 days from December 31, 2025, are incorporated by reference into Part III of this Annual Report on Form 10-K to the extent stated herein.
Amendment Flag	false
Document Fiscal Year Focus	2025
Document Fiscal Period Focus	FY
Entity Central Index Key	0002051820
Entity Public Float			$ 0
Common Stock
Document Information [Line Items]
Title of 12(b) Security	Common Stock, $0.001 par value
Trading Symbol	MLCI
Security Exchange Name	NASDAQ
Entity Common Stock, Shares Outstanding	12,786,770
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