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Loss and Loss Adjustment Expense Reserves - Average Annual Percentage Payout of Incurred Losses and Allocated LAE by Age, Net of Reinsurance (Details)
Dec. 31, 2021
Property and Accident & Health  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
1 31.50%
2 33.40%
3 19.20%
4 5.70%
5 1.20%
6 1.40%
7 0.80%
8 0.30%
9 0.00%
10 0.10%
Marine & Energy  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
1 19.80%
2 37.70%
3 20.20%
4 5.70%
5 4.30%
6 7.20%
7 0.40%
8 0.10%
9 0.40%
10 0.20%
Specialty  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
1 34.00%
2 33.80%
3 7.30%
4 0.50%
5 4.60%
6 4.40%
7 4.60%
8 3.10%
9 3.50%
10 1.00%
Casualty - Active  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
1 9.10%
2 14.70%
3 18.50%
4 14.20%
5 9.60%
6 10.70%
7 3.90%
8 3.10%
9 1.00%
10 3.10%
Casualty - Runoff  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
1 9.40%
2 15.30%
3 17.00%
4 15.90%
5 9.70%
6 8.10%
7 7.00%
8 3.60%
9 2.50%
10 1.70%