v3.25.4
Financial Risk Management - Liquidity Risk (Details)
$ / shares in Units, $ in Millions, $ in Millions
12 Months Ended
Dec. 31, 2025
USD ($)
$ / shares
Dec. 31, 2024
USD ($)
Dec. 31, 2025
CAD ($)
Jul. 16, 2025
USD ($)
Dec. 31, 2024
CAD ($)
Financial Risk Management.          
Borrowings, Principal $ 13,743.3 $ 11,874.1      
Holding company cash and investments (net of derivative obligations) 2,716.9 2,502.1      
Portfolio investments cash and investments, net 72,142.9 64,864.1      
Foreign currency risk | Unsecured senior notes | Hedges of net investment in Canadian subsidiaries          
Financial Risk Management.          
Principal amount of hedged item     $ 3,840.0   $ 3,140.0
Holding company          
Financial Risk Management.          
Commitment to pay dividends in the next fiscal year $ 329.1        
Commitment to pay dividends in the next fiscal year (per share) | $ / shares $ 15        
Borrowings, Principal $ 8,922.7 7,976.1      
Holding company | Run-off          
Financial Risk Management.          
Capital Contribution 115.0        
Holding company | Revolving Credit Facility          
Financial Risk Management.          
Borrowings, Principal       $ 2,000.0  
Maximum borrowing capacity 2,000.0        
Holding company | 4.70% due December 16, 2026 (Cdn$450.0)          
Financial Risk Management.          
Borrowings, Principal $ 328.3 $ 312.9 $ 450.0   $ 450.0
Interest rate 4.70% 4.70% 4.70%   4.70%
Holding company | 8.30% due April 15, 2026          
Financial Risk Management.          
Borrowings, Principal $ 91.8 $ 91.8      
Interest rate 8.30% 8.30% 8.30%   8.30%
Holding company | Burgan Bank and First Abu Dhabi Bank          
Financial Risk Management.          
Borrowings, Principal $ 330.0        
Commitment for payment deed in next fiscal year 165.0        
Holding company | Long equity total return swap contracts          
Financial Risk Management.          
Cash received from settlement of derivative contracts 57.9 $ 517.7      
Insurance and reinsurance subsidiaries          
Financial Risk Management.          
Borrowings, Principal 1,607.5 979.2      
Insurance and reinsurance subsidiaries | Fairfax India          
Financial Risk Management.          
Investments lacking liquidity or inactively traded $ 1,250.7 $ 1,020.7      
Insurance and reinsurance subsidiaries | Investments that may lack liquidity or are inactively traded          
Financial Risk Management.          
Risk exposure percentage 21.80% 20.70% 21.80%   20.70%
Non-insurance companies          
Financial Risk Management.          
Borrowings, Principal $ 3,213.1 $ 2,918.8      
Non-insurance companies | Dexterra, Peak Achievement and Sporting Life Group's credit facilities          
Financial Risk Management.          
Repayments of borrowings in next fiscal year $ 264.3