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Losses, Claims and Settlement Expenses - Consolidated - Historical Average Annual Payout of Incurred Claims (Details)
Dec. 31, 2023
Workers' compensation [Member]  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 16.20%
Year 2 23.90%
Year 3 14.20%
Year 4 8.40%
Year 5 4.80%
Year 6 3.50%
Year 7 2.20%
Year 8 1.30%
Year 9 0.90%
Year 10 1.00%
General liability [Member]  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 5.10%
Year 2 11.80%
Year 3 15.10%
Year 4 15.60%
Year 5 13.70%
Year 6 7.50%
Year 7 5.10%
Year 8 4.40%
Year 9 3.00%
Year 10 3.40%
Commercial automobile [Member]  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 35.70%
Year 2 23.40%
Year 3 16.00%
Year 4 11.10%
Year 5 6.10%
Year 6 2.50%
Year 7 0.80%
Year 8 0.80%
Year 9 0.60%
Year 10 0.30%