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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) - Ark
Dec. 31, 2023
Property and Accident & Health  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
1 25.80%
2 35.50%
3 20.10%
4 6.10%
5 1.30%
6 1.10%
7 0.40%
8 0.30%
9 0.10%
10 0.00%
Specialty  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
1 20.50%
2 30.60%
3 9.70%
4 6.00%
5 7.70%
6 6.00%
7 1.20%
8 1.70%
9 3.10%
10 0.50%
Marine & Energy  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
1 14.20%
2 34.90%
3 19.40%
4 6.10%
5 4.30%
6 6.50%
7 0.30%
8 0.30%
9 0.30%
10 0.10%
Casualty-Active  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
1 4.80%
2 8.80%
3 14.20%
4 11.30%
5 8.80%
6 10.90%
7 6.10%
8 4.60%
9 2.00%
10 3.20%
Casualty-Runoff  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
1 8.60%
2 14.00%
3 15.50%
4 14.80%
5 8.60%
6 7.00%
7 5.50%
8 4.20%
9 3.00%
10 2.10%