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Earnings per Share (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Earnings per Share    
Net earnings attributable to shareholders of Fairfax $ 3,874.9 $ 4,381.8
Preferred share dividends (48.6) (49.7)
Excess of book value over consideration of preferred shares redeemed 53.5  
Net earnings attributable to common shareholders - basic and diluted $ 3,879.8 $ 4,332.1
Weighted average common shares outstanding - basic (in shares) 22,373,092 23,182,558
Share-based payment awards (in shares) 1,790,368 1,823,558
Weighted average common shares outstanding - diluted (in shares) 24,163,460 25,006,116
Net earnings per common share - basic (in dollars per share) $ 173.41 $ 186.87
Net earnings per common share - diluted (in dollars per share) $ 160.56 $ 173.24