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Historical Loss and LAE Development - Cumulative Paid Loss and Loss Adjustment Expenses, Net of Reinsurance (Details)
Dec. 31, 2023
Property segment  
Shortduration Insurance Contracts Historical Claims Duration [Line Items]  
Average annual percentage payout of incurred losses by age, Year 1 51.60%
Average annual percentage payout of incurred losses by age, Year 2 31.30%
Average annual percentage payout of incurred losses by age, Year 3 6.50%
Average annual percentage payout of incurred losses by age, Year 4 3.50%
Average annual percentage payout of incurred losses by age, Year 5 2.30%
Average annual percentage payout of incurred losses by age, Year 6 1.20%
Average annual percentage payout of incurred losses by age, Year 7 0.40%
Average annual percentage payout of incurred losses by age, Year 8 0.60%
Average annual percentage payout of incurred losses by age, Year 9 0.20%
Average annual percentage payout of incurred losses by age, Year 10 0.10%
Surety Segment  
Shortduration Insurance Contracts Historical Claims Duration [Line Items]  
Average annual percentage payout of incurred losses by age, Year 1 18.30%
Average annual percentage payout of incurred losses by age, Year 2 37.40%
Average annual percentage payout of incurred losses by age, Year 3 10.20%
Average annual percentage payout of incurred losses by age, Year 4 7.10%
Average annual percentage payout of incurred losses by age, Year 5 3.40%
Average annual percentage payout of incurred losses by age, Year 6 (5.50%)
Average annual percentage payout of incurred losses by age, Year 7 0.60%
Average annual percentage payout of incurred losses by age, Year 8 (3.50%)
Average annual percentage payout of incurred losses by age, Year 9 0.90%
Average annual percentage payout of incurred losses by age, Year 10 (0.10%)
Primary Occurrence | Casualty Segment  
Shortduration Insurance Contracts Historical Claims Duration [Line Items]  
Average annual percentage payout of incurred losses by age, Year 1 13.60%
Average annual percentage payout of incurred losses by age, Year 2 13.60%
Average annual percentage payout of incurred losses by age, Year 3 13.90%
Average annual percentage payout of incurred losses by age, Year 4 14.90%
Average annual percentage payout of incurred losses by age, Year 5 11.80%
Average annual percentage payout of incurred losses by age, Year 6 8.50%
Average annual percentage payout of incurred losses by age, Year 7 5.70%
Average annual percentage payout of incurred losses by age, Year 8 4.80%
Average annual percentage payout of incurred losses by age, Year 9 1.90%
Average annual percentage payout of incurred losses by age, Year 10 2.20%
Excess Occurrence | Casualty Segment  
Shortduration Insurance Contracts Historical Claims Duration [Line Items]  
Average annual percentage payout of incurred losses by age, Year 1 4.10%
Average annual percentage payout of incurred losses by age, Year 2 12.90%
Average annual percentage payout of incurred losses by age, Year 3 13.10%
Average annual percentage payout of incurred losses by age, Year 4 11.90%
Average annual percentage payout of incurred losses by age, Year 5 9.50%
Average annual percentage payout of incurred losses by age, Year 6 6.00%
Average annual percentage payout of incurred losses by age, Year 7 7.30%
Average annual percentage payout of incurred losses by age, Year 8 8.50%
Average annual percentage payout of incurred losses by age, Year 9 2.80%
Average annual percentage payout of incurred losses by age, Year 10 7.80%
Claims Made | Casualty Segment  
Shortduration Insurance Contracts Historical Claims Duration [Line Items]  
Average annual percentage payout of incurred losses by age, Year 1 3.80%
Average annual percentage payout of incurred losses by age, Year 2 16.10%
Average annual percentage payout of incurred losses by age, Year 3 17.40%
Average annual percentage payout of incurred losses by age, Year 4 15.70%
Average annual percentage payout of incurred losses by age, Year 5 12.60%
Average annual percentage payout of incurred losses by age, Year 6 8.00%
Average annual percentage payout of incurred losses by age, Year 7 3.60%
Average annual percentage payout of incurred losses by age, Year 8 5.30%
Average annual percentage payout of incurred losses by age, Year 9 1.30%
Average annual percentage payout of incurred losses by age, Year 10 0.00%
Transportation | Casualty Segment  
Shortduration Insurance Contracts Historical Claims Duration [Line Items]  
Average annual percentage payout of incurred losses by age, Year 1 14.80%
Average annual percentage payout of incurred losses by age, Year 2 19.30%
Average annual percentage payout of incurred losses by age, Year 3 16.80%
Average annual percentage payout of incurred losses by age, Year 4 16.90%
Average annual percentage payout of incurred losses by age, Year 5 12.20%
Average annual percentage payout of incurred losses by age, Year 6 7.90%
Average annual percentage payout of incurred losses by age, Year 7 5.40%
Average annual percentage payout of incurred losses by age, Year 8 3.00%
Average annual percentage payout of incurred losses by age, Year 9 2.50%
Average annual percentage payout of incurred losses by age, Year 10 0.10%