v3.25.4
Segmented Information - Insurance revenue and operating income (loss) by reporting segment (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Segmented Information    
Insurance revenue $ 31,595.0 $ 31,064.1
Insurance service result 3,847.5 4,452.2
Other insurance operating expenses (1,150.7) (1,182.9)
Interest and dividends 2,332.7 2,341.9
Share of profit of associates 734.7 859.5
Non-insurance revenue 8,537.6 6,682.8
Non-insurance expenses (8,196.9) (6,470.5)
Operating income (loss) 6,104.9 6,683.0
Net finance income (expense) from insurance contracts and reinsurance contract assets held (1,836.8) (1,279.9)
Net gains on investments 3,151.4 1,067.2
Interest expense (821.9) (649.0)
Corporate overhead and other (480.5) (450.2)
Earnings before income taxes 6,440.3 5,638.5
Provision for income taxes (1,156.5) (1,375.6)
Net earnings 5,283.8 4,262.9
Attributable to:    
Shareholders of Fairfax 4,772.4 3,874.9
Non-controlling interests 511.4 388.0
Net earnings 5,283.8 4,262.9
Property and Casualty Insurance and Reinsurance    
Segmented Information    
Insurance revenue 31,341.7 30,874.5
Insurance service result 4,151.1 4,602.1
Other insurance operating expenses (1,043.1) (1,038.1)
Interest and dividends 2,241.5 2,224.6
Share of profit of associates 571.7 745.1
Operating income (loss) 5,921.2 6,533.7
Property and Casualty Insurance and Reinsurance | North American Insurers    
Segmented Information    
Insurance revenue 9,150.2 8,731.8
Insurance service result 1,128.9 1,101.1
Other insurance operating expenses (322.6) (318.7)
Interest and dividends 538.7 512.9
Share of profit of associates 51.2 143.1
Operating income (loss) 1,396.2 1,438.4
Property and Casualty Insurance and Reinsurance | Global Insurers and Reinsurers    
Segmented Information    
Insurance revenue 16,222.0 15,513.0
Insurance service result 2,413.4 3,037.4
Other insurance operating expenses (427.4) (434.6)
Interest and dividends 1,343.1 1,259.4
Share of profit of associates 371.6 450.3
Operating income (loss) 3,700.7 4,312.5
Property and Casualty Insurance and Reinsurance | International Insurers and Reinsurers    
Segmented Information    
Insurance revenue 5,969.5 6,629.7
Insurance service result 608.8 463.6
Other insurance operating expenses (293.1) (284.8)
Interest and dividends 359.7 452.3
Share of profit of associates 148.9 151.7
Operating income (loss) 824.3 782.8
Life insurance and Run-off    
Segmented Information    
Insurance revenue 253.3 189.6
Insurance service result (303.6) (149.9)
Other insurance operating expenses (107.6) (144.8)
Interest and dividends 113.5 126.4
Share of profit of associates 84.0 76.2
Non-insurance revenue 0.0  
Non-insurance expenses 0.0  
Operating income (loss) (213.7) (92.1)
Non-insurance companies    
Segmented Information    
Interest and dividends (22.3) (9.1)
Share of profit of associates 79.0 38.2
Non-insurance revenue 8,537.6 6,682.8
Non-insurance expenses (8,196.9) (6,470.5)
Operating income (loss) 397.4 241.4
Attributable to:    
Non-controlling interests 67.9 (62.6)
Operating segments    
Segmented Information    
Insurance revenue 32,032.5 31,490.1
Corporate overhead and other (157.3) (182.8)
Operating segments | Property and Casualty Insurance and Reinsurance    
Segmented Information    
Insurance revenue 31,779.2 31,290.1
Operating segments | Property and Casualty Insurance and Reinsurance | North American Insurers    
Segmented Information    
Insurance revenue 9,212.2 8,779.9
Operating segments | Property and Casualty Insurance and Reinsurance | Global Insurers and Reinsurers    
Segmented Information    
Insurance revenue 16,388.6 15,684.7
Operating segments | Property and Casualty Insurance and Reinsurance | International Insurers and Reinsurers    
Segmented Information    
Insurance revenue 6,178.4 6,825.5
Operating segments | Life insurance and Run-off    
Segmented Information    
Insurance revenue 253.3 200.0
Operating segments | Non-insurance companies    
Segmented Information    
Interest and dividends (22.3) (9.1)
Non-insurance revenue 8,537.6 6,682.8
Non-insurance expenses (8,196.9) (6,470.5)
Operating income (loss) 397.4 241.4
Intercompany insurance revenue    
Segmented Information    
Insurance revenue (437.5) (426.0)
Intercompany insurance revenue | Property and Casualty Insurance and Reinsurance    
Segmented Information    
Insurance revenue (437.5) (415.6)
Intercompany insurance revenue | Property and Casualty Insurance and Reinsurance | North American Insurers    
Segmented Information    
Insurance revenue (62.0) (48.1)
Intercompany insurance revenue | Property and Casualty Insurance and Reinsurance | Global Insurers and Reinsurers    
Segmented Information    
Insurance revenue (166.6) (171.7)
Intercompany insurance revenue | Property and Casualty Insurance and Reinsurance | International Insurers and Reinsurers    
Segmented Information    
Insurance revenue (208.9) (195.8)
Intercompany insurance revenue | Life insurance and Run-off    
Segmented Information    
Insurance revenue $ 0.0 $ (10.4)