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Historical Loss and LAE Development - Cumulative Paid Loss and Loss Adjustment Expenses, Net of Reinsurance (Details)
Dec. 31, 2021
Property segment  
Shortduration Insurance Contracts Historical Claims Duration [Line Items]  
Average annual percentage payout of incurred losses by age, Year 1 51.30%
Average annual percentage payout of incurred losses by age, Year 2 31.80%
Average annual percentage payout of incurred losses by age, Year 3 6.60%
Average annual percentage payout of incurred losses by age, Year 4 2.80%
Average annual percentage payout of incurred losses by age, Year 5 2.30%
Average annual percentage payout of incurred losses by age, Year 6 1.10%
Average annual percentage payout of incurred losses by age, Year 7 0.50%
Average annual percentage payout of incurred losses by age, Year 8 0.10%
Average annual percentage payout of incurred losses by age, Year 9 (0.10%)
Average annual percentage payout of incurred losses by age, Year 10 0.00%
Surety Segment  
Shortduration Insurance Contracts Historical Claims Duration [Line Items]  
Average annual percentage payout of incurred losses by age, Year 1 21.60%
Average annual percentage payout of incurred losses by age, Year 2 39.50%
Average annual percentage payout of incurred losses by age, Year 3 13.00%
Average annual percentage payout of incurred losses by age, Year 4 7.60%
Average annual percentage payout of incurred losses by age, Year 5 2.00%
Average annual percentage payout of incurred losses by age, Year 6 (0.70%)
Average annual percentage payout of incurred losses by age, Year 7 (1.50%)
Average annual percentage payout of incurred losses by age, Year 8 (0.90%)
Average annual percentage payout of incurred losses by age, Year 9 (0.70%)
Average annual percentage payout of incurred losses by age, Year 10 2.00%
Primary Occurrence | Casualty Segment  
Shortduration Insurance Contracts Historical Claims Duration [Line Items]  
Average annual percentage payout of incurred losses by age, Year 1 12.80%
Average annual percentage payout of incurred losses by age, Year 2 13.30%
Average annual percentage payout of incurred losses by age, Year 3 14.80%
Average annual percentage payout of incurred losses by age, Year 4 16.50%
Average annual percentage payout of incurred losses by age, Year 5 11.60%
Average annual percentage payout of incurred losses by age, Year 6 7.20%
Average annual percentage payout of incurred losses by age, Year 7 5.20%
Average annual percentage payout of incurred losses by age, Year 8 2.90%
Average annual percentage payout of incurred losses by age, Year 9 2.10%
Average annual percentage payout of incurred losses by age, Year 10 1.60%
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 12.20%
Average annual percentage payout of incurred losses by age, Year 3 15.40%
Average annual percentage payout of incurred losses by age, Year 4 15.00%
Average annual percentage payout of incurred losses by age, Year 5 9.20%
Average annual percentage payout of incurred losses by age, Year 6 4.30%
Average annual percentage payout of incurred losses by age, Year 7 4.80%
Average annual percentage payout of incurred losses by age, Year 8 9.70%
Average annual percentage payout of incurred losses by age, Year 9 2.30%
Average annual percentage payout of incurred losses by age, Year 10 0.20%
Claims Made | Casualty Segment  
Shortduration Insurance Contracts Historical Claims Duration [Line Items]  
Average annual percentage payout of incurred losses by age, Year 1 3.20%
Average annual percentage payout of incurred losses by age, Year 2 16.10%
Average annual percentage payout of incurred losses by age, Year 3 19.60%
Average annual percentage payout of incurred losses by age, Year 4 15.70%
Average annual percentage payout of incurred losses by age, Year 5 11.60%
Average annual percentage payout of incurred losses by age, Year 6 9.50%
Average annual percentage payout of incurred losses by age, Year 7 4.30%
Average annual percentage payout of incurred losses by age, Year 8 5.00%
Average annual percentage payout of incurred losses by age, Year 9 1.80%
Average annual percentage payout of incurred losses by age, Year 10 1.20%
Transportation | Casualty Segment  
Shortduration Insurance Contracts Historical Claims Duration [Line Items]  
Average annual percentage payout of incurred losses by age, Year 1 15.50%
Average annual percentage payout of incurred losses by age, Year 2 18.30%
Average annual percentage payout of incurred losses by age, Year 3 17.00%
Average annual percentage payout of incurred losses by age, Year 4 17.10%
Average annual percentage payout of incurred losses by age, Year 5 11.70%
Average annual percentage payout of incurred losses by age, Year 6 7.40%
Average annual percentage payout of incurred losses by age, Year 7 2.80%
Average annual percentage payout of incurred losses by age, Year 8 1.50%
Average annual percentage payout of incurred losses by age, Year 9 0.30%
Average annual percentage payout of incurred losses by age, Year 10 0.00%