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Historical Loss and LAE Development - Cumulative Paid Loss and Loss Adjustment Expenses, Net of Reinsurance (Details)
Dec. 31, 2024
Property segment  
Shortduration Insurance Contracts Historical Claims Duration [Line Items]  
Average annual percentage payout of incurred losses by age, Year 1 49.50%
Average annual percentage payout of incurred losses by age, Year 2 30.00%
Average annual percentage payout of incurred losses by age, Year 3 7.10%
Average annual percentage payout of incurred losses by age, Year 4 3.90%
Average annual percentage payout of incurred losses by age, Year 5 2.40%
Average annual percentage payout of incurred losses by age, Year 6 0.90%
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 1.40%
Surety Segment  
Shortduration Insurance Contracts Historical Claims Duration [Line Items]  
Average annual percentage payout of incurred losses by age, Year 1 17.20%
Average annual percentage payout of incurred losses by age, Year 2 30.80%
Average annual percentage payout of incurred losses by age, Year 3 12.90%
Average annual percentage payout of incurred losses by age, Year 4 8.80%
Average annual percentage payout of incurred losses by age, Year 5 9.80%
Average annual percentage payout of incurred losses by age, Year 6 (4.80%)
Average annual percentage payout of incurred losses by age, Year 7 8.00%
Average annual percentage payout of incurred losses by age, Year 8 (2.80%)
Average annual percentage payout of incurred losses by age, Year 9 1.40%
Average annual percentage payout of incurred losses by age, Year 10 (3.30%)
Primary Occurrence | Casualty Segment  
Shortduration Insurance Contracts Historical Claims Duration [Line Items]  
Average annual percentage payout of incurred losses by age, Year 1 12.90%
Average annual percentage payout of incurred losses by age, Year 2 13.80%
Average annual percentage payout of incurred losses by age, Year 3 13.40%
Average annual percentage payout of incurred losses by age, Year 4 15.00%
Average annual percentage payout of incurred losses by age, Year 5 12.20%
Average annual percentage payout of incurred losses by age, Year 6 9.20%
Average annual percentage payout of incurred losses by age, Year 7 6.10%
Average annual percentage payout of incurred losses by age, Year 8 5.50%
Average annual percentage payout of incurred losses by age, Year 9 1.60%
Average annual percentage payout of incurred losses by age, Year 10 3.30%
Excess Occurrence | Casualty Segment  
Shortduration Insurance Contracts Historical Claims Duration [Line Items]  
Average annual percentage payout of incurred losses by age, Year 1 4.00%
Average annual percentage payout of incurred losses by age, Year 2 14.30%
Average annual percentage payout of incurred losses by age, Year 3 13.40%
Average annual percentage payout of incurred losses by age, Year 4 11.80%
Average annual percentage payout of incurred losses by age, Year 5 9.60%
Average annual percentage payout of incurred losses by age, Year 6 6.70%
Average annual percentage payout of incurred losses by age, Year 7 8.00%
Average annual percentage payout of incurred losses by age, Year 8 8.30%
Average annual percentage payout of incurred losses by age, Year 9 1.80%
Average annual percentage payout of incurred losses by age, Year 10 6.40%
Claims Made | Casualty Segment  
Shortduration Insurance Contracts Historical Claims Duration [Line Items]  
Average annual percentage payout of incurred losses by age, Year 1 3.90%
Average annual percentage payout of incurred losses by age, Year 2 15.60%
Average annual percentage payout of incurred losses by age, Year 3 14.80%
Average annual percentage payout of incurred losses by age, Year 4 14.90%
Average annual percentage payout of incurred losses by age, Year 5 15.40%
Average annual percentage payout of incurred losses by age, Year 6 9.00%
Average annual percentage payout of incurred losses by age, Year 7 6.70%
Average annual percentage payout of incurred losses by age, Year 8 5.00%
Average annual percentage payout of incurred losses by age, Year 9 2.30%
Average annual percentage payout of incurred losses by age, Year 10 1.00%
Transportation | Casualty Segment  
Shortduration Insurance Contracts Historical Claims Duration [Line Items]  
Average annual percentage payout of incurred losses by age, Year 1 13.90%
Average annual percentage payout of incurred losses by age, Year 2 18.90%
Average annual percentage payout of incurred losses by age, Year 3 16.60%
Average annual percentage payout of incurred losses by age, Year 4 17.10%
Average annual percentage payout of incurred losses by age, Year 5 11.00%
Average annual percentage payout of incurred losses by age, Year 6 8.40%
Average annual percentage payout of incurred losses by age, Year 7 6.00%
Average annual percentage payout of incurred losses by age, Year 8 3.50%
Average annual percentage payout of incurred losses by age, Year 9 2.10%
Average annual percentage payout of incurred losses by age, Year 10 2.70%