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Property and Casualty Insurance Reserves - Historical Claims Duration (Details)
Dec. 31, 2019
Specialty Personal Automobile Insurance—Liability  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 43.20%
Year 2 81.10%
Year 3 92.30%
Year 4 96.30%
Year 5 98.40%
Specialty Personal Automobile Insurance—Physical Damage  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 93.90%
Year 2 100.70%
Year 3 100.10%
Year 4 100.00%
Year 5 99.90%
Commercial Automobile Insurance—Liability  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 29.90%
Year 2 61.10%
Year 3 77.60%
Year 4 88.80%
Year 5 97.20%
Commercial Automobile Insurance—Physical Damage  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 92.20%
Year 2 100.00%
Year 3 99.70%
Year 4 100.00%
Year 5 100.00%
Preferred Personal Automobile Insurance—Liability  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 37.20%
Year 2 68.20%
Year 3 83.90%
Year 4 91.60%
Year 5 95.60%
Preferred Personal Automobile Insurance—Physical Damage  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 98.00%
Year 2 100.60%
Year 3 100.10%
Year 4 100.00%
Year 5 100.00%
Homeowners  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 69.30%
Year 2 96.30%
Year 3 96.40%
Year 4 98.20%
Year 5 99.00%