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Property and Casualty Insurance Reserves - Historical Claims Duration (Details)
Dec. 31, 2020
Specialty Personal Automobile Insurance—Liability  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 41.90%
Year 2 80.90%
Year 3 92.60%
Year 4 96.70%
Year 5 98.60%
Specialty Personal Automobile Insurance—Physical Damage  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 93.00%
Year 2 100.80%
Year 3 100.10%
Year 4 100.00%
Year 5 100.00%
Commercial Automobile Insurance—Liability  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 29.50%
Year 2 61.50%
Year 3 78.30%
Year 4 88.70%
Year 5 94.90%
Commercial Automobile Insurance—Physical Damage  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 89.30%
Year 2 99.90%
Year 3 99.90%
Year 4 100.00%
Year 5 100.00%
Preferred Personal Automobile Insurance—Liability  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 33.60%
Year 2 66.40%
Year 3 83.00%
Year 4 90.70%
Year 5 95.50%
Preferred Personal Automobile Insurance—Physical Damage  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 97.20%
Year 2 100.80%
Year 3 100.10%
Year 4 100.00%
Year 5 100.00%
Homeowners  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 67.30%
Year 2 96.30%
Year 3 97.40%
Year 4 98.60%
Year 5 99.20%