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Reserve for Claims and Claim Expenses - Historical Claims Duration (Details)
Dec. 31, 2023
Property  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Average annual percentage payout, year one 21.30%
Average annual percentage payout, year two 27.90%
Average annual percentage payout, year three 15.50%
Average annual percentage payout, year four 7.40%
Average annual percentage payout, year five 3.50%
Average annual percentage payout, year six 0.20%
Average annual percentage payout, year seven 1.10%
Average annual percentage payout, year eight 0.20%
Average annual percentage payout, year nine 0.50%
Average annual percentage payout, year ten 0.70%
Casualty and Specialty  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Average annual percentage payout, year one 14.20%
Average annual percentage payout, year two 17.60%
Average annual percentage payout, year three 12.20%
Average annual percentage payout, year four 12.80%
Average annual percentage payout, year five 10.20%
Average annual percentage payout, year six 7.40%
Average annual percentage payout, year seven 5.30%
Average annual percentage payout, year eight 2.90%
Average annual percentage payout, year nine 2.10%
Average annual percentage payout, year ten 0.40%