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Loss And Loss Adjustment Expense Reserves Historical Claims Duration (Details)
Dec. 31, 2018
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 47.10%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two 30.70%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three 11.60%
Short-duration Insurance Contracts, Historical Claims Duration, Year Four 5.40%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five 2.10%
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 98.90%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two 1.10%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three (0.10%)
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 46.10%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two 31.20%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three 12.20%
Short-duration Insurance Contracts, Historical Claims Duration, Year Four 5.90%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five 2.20%
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 100.10%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two (0.10%)
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 24.60%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two 27.70%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three 20.10%
Short-duration Insurance Contracts, Historical Claims Duration, Year Four 12.60%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five 6.80%
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 90.40%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two 9.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three (0.10%)
Short-duration Insurance Contracts, Historical Claims Duration, Year Four 0.10%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five 0.10%
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 20.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three 3.30%
Short-duration Insurance Contracts, Historical Claims Duration, Year Four 1.40%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five 0.40%