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Financial Risk Management - Concentration of insurance risk (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Financial Risk Management.    
Insurance $ 31,064.1 $ 26,934.8
Reinsurance $ (6,197.7) (4,977.4)
Reserving risk    
Asbestos and environmental claims, maximum settlement period (in years) 40 years  
Catastrophe risk    
Normalized Net Earnings, Percent Return On Common Shareholders' Equity Adjusted To Pre-Tax Basis 15.00%  
Canada    
Financial Risk Management.    
Insurance $ 2,869.1 2,772.7
United States    
Financial Risk Management.    
Insurance 17,167.6 16,922.7
Middle East and Asia    
Financial Risk Management.    
Insurance 5,249.5 1,958.6
Other International    
Financial Risk Management.    
Insurance 5,777.9 5,280.8
Property    
Financial Risk Management.    
Insurance 10,796.9 9,743.2
Casualty    
Financial Risk Management.    
Insurance 16,820.5 14,948.4
Specialty    
Financial Risk Management.    
Insurance 3,446.7 2,243.2
Insurance risk    
Financial Risk Management.    
Insurance 31,064.1 26,934.8
Reinsurance (6,197.7) (4,977.4)
Net insurance revenue 24,866.4 21,957.4
Insurance risk | Canada    
Financial Risk Management.    
Insurance 2,868.9 2,772.7
Reinsurance (265.9) (286.1)
Net insurance revenue 2,603.0 2,486.6
Insurance risk | United States    
Financial Risk Management.    
Insurance 17,167.9 16,922.7
Reinsurance (2,870.7) (3,004.3)
Net insurance revenue 14,297.2 13,918.4
Insurance risk | Middle East and Asia    
Financial Risk Management.    
Insurance 5,249.6 1,958.6
Reinsurance (1,790.5) (433.8)
Net insurance revenue 3,459.1 1,524.8
Insurance risk | Other International    
Financial Risk Management.    
Insurance 5,777.7 5,280.8
Reinsurance (1,270.6) (1,253.2)
Net insurance revenue 4,507.1 4,027.6
Insurance risk | Property    
Financial Risk Management.    
Net insurance revenue 8,524.4 7,798.8
Insurance risk | Property | Canada    
Financial Risk Management.    
Net insurance revenue 1,392.4 1,268.1
Insurance risk | Property | United States    
Financial Risk Management.    
Net insurance revenue 3,828.1 4,021.1
Insurance risk | Property | Middle East and Asia    
Financial Risk Management.    
Net insurance revenue 1,320.3 735.0
Insurance risk | Property | Other International    
Financial Risk Management.    
Net insurance revenue 1,983.6 1,774.6
Insurance risk | Casualty    
Financial Risk Management.    
Net insurance revenue 13,739.6 12,411.7
Insurance risk | Casualty | Canada    
Financial Risk Management.    
Net insurance revenue 1,113.8 1,124.4
Insurance risk | Casualty | United States    
Financial Risk Management.    
Net insurance revenue 9,582.3 9,188.7
Insurance risk | Casualty | Middle East and Asia    
Financial Risk Management.    
Net insurance revenue 1,274.1 556.0
Insurance risk | Casualty | Other International    
Financial Risk Management.    
Net insurance revenue 1,769.4 1,542.6
Insurance risk | Specialty    
Financial Risk Management.    
Net insurance revenue 2,602.4 1,746.9
Insurance risk | Specialty | Canada    
Financial Risk Management.    
Net insurance revenue 96.8 94.1
Insurance risk | Specialty | United States    
Financial Risk Management.    
Net insurance revenue 886.8 708.6
Insurance risk | Specialty | Middle East and Asia    
Financial Risk Management.    
Net insurance revenue 864.7 233.8
Insurance risk | Specialty | Other International    
Financial Risk Management.    
Net insurance revenue 754.1 710.4
Life insurance and Run-off    
Financial Risk Management.    
Insurance 189.6 135.5
Life insurance and Run-off | United States    
Financial Risk Management.    
Insurance 10.9 13.2
Life insurance and Run-off | Middle East and Asia    
Financial Risk Management.    
Insurance 42.0  
Life insurance and Run-off | Other International    
Financial Risk Management.    
Insurance 136.7 122.3
Life insurance and Run-off | Casualty    
Financial Risk Management.    
Insurance 10.9 13.2
Life insurance and Run-off | Specialty    
Financial Risk Management.    
Insurance 178.7 122.3
Life insurance and Run-off | Insurance risk    
Financial Risk Management.    
Net insurance revenue $ 151.9 $ 118.4