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Loss And Loss Adjustment Expense Reserves Historical Claims Duration (Details)
Dec. 31, 2019
Personal Lines Segment | Agency Channel | Personal Lines - Liability  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Short-duration Insurance Contracts, Historical Claims Duration, Year One 46.30%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two 31.30%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three 12.10%
Short-duration Insurance Contracts, Historical Claims Duration, Year Four 5.70%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five 2.40%
Personal Lines Segment | Agency Channel | Personal Lines - Physical Damage  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Short-duration Insurance Contracts, Historical Claims Duration, Year One 98.70%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two 1.50%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three (0.20%)
Short-duration Insurance Contracts, Historical Claims Duration, Year Four 0.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five 0.00%
Personal Lines Segment | Direct Channel | Personal Lines - Liability  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Short-duration Insurance Contracts, Historical Claims Duration, Year One 45.40%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two 31.90%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three 12.60%
Short-duration Insurance Contracts, Historical Claims Duration, Year Four 6.30%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five 2.50%
Personal Lines Segment | Direct Channel | Personal Lines - Physical Damage  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Short-duration Insurance Contracts, Historical Claims Duration, Year One 100.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two 0.20%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three (0.20%)
Short-duration Insurance Contracts, Historical Claims Duration, Year Four 0.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five 0.00%
Commercial Lines Segment | Commercial Lines - Liability  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Short-duration Insurance Contracts, Historical Claims Duration, Year One 23.10%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two 28.90%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three 20.80%
Short-duration Insurance Contracts, Historical Claims Duration, Year Four 14.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five 7.00%
Commercial Lines Segment | Commercial Lines - Physical Damage  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Short-duration Insurance Contracts, Historical Claims Duration, Year One 89.60%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two 9.90%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three 0.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Four 0.10%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five 0.00%
Property Segment | Property  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Short-duration Insurance Contracts, Historical Claims Duration, Year One 73.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two 20.40%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three 3.20%
Short-duration Insurance Contracts, Historical Claims Duration, Year Four 1.70%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five 0.90%