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Reserve for Loss and Loss Expense (Historical Claims Duration) (Details)
$ in Thousands
Dec. 31, 2020
USD ($)
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Net outstanding liabilities $ 12,185,164
Standard Commercial Lines [Member] | General Liability [Member]  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Short-duration Insurance Contracts, Historical Claims Duration, Year One 6.30%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two 12.20%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three 15.70%
Short-duration Insurance Contracts, Historical Claims Duration, Year Four 17.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five 14.90%
Short-duration Insurance Contracts, Historical Claims Duration, Year Six 9.80%
Short-duration Insurance Contracts, Historical Claims Duration, Year Seven 6.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Eight 5.10%
Short-duration Insurance Contracts, Historical Claims Duration, Year Nine 2.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Ten 1.80%
Standard Commercial Lines [Member] | Workers Compensation [Member]  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Short-duration Insurance Contracts, Historical Claims Duration, Year One 21.80%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two 25.60%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three 13.50%
Short-duration Insurance Contracts, Historical Claims Duration, Year Four 8.10%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five 4.30%
Short-duration Insurance Contracts, Historical Claims Duration, Year Six 3.60%
Short-duration Insurance Contracts, Historical Claims Duration, Year Seven 3.50%
Short-duration Insurance Contracts, Historical Claims Duration, Year Eight 2.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Nine 1.60%
Short-duration Insurance Contracts, Historical Claims Duration, Year Ten 1.20%
Standard Commercial Lines [Member] | Commercial Automobile [Member]  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Short-duration Insurance Contracts, Historical Claims Duration, Year One 37.50%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two 17.30%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three 14.10%
Short-duration Insurance Contracts, Historical Claims Duration, Year Four 12.70%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five 10.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Six 4.60%
Short-duration Insurance Contracts, Historical Claims Duration, Year Seven 1.60%
Short-duration Insurance Contracts, Historical Claims Duration, Year Eight 0.80%
Short-duration Insurance Contracts, Historical Claims Duration, Year Nine 0.90%
Short-duration Insurance Contracts, Historical Claims Duration, Year Ten 0.30%
Standard Commercial Lines [Member] | Business Owners' Policies [Member]  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Short-duration Insurance Contracts, Historical Claims Duration, Year One 48.60%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two 19.40%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three 8.50%
Short-duration Insurance Contracts, Historical Claims Duration, Year Four 8.90%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five 6.70%
Short-duration Insurance Contracts, Historical Claims Duration, Year Six 3.70%
Short-duration Insurance Contracts, Historical Claims Duration, Year Seven 1.50%
Short-duration Insurance Contracts, Historical Claims Duration, Year Eight 0.20%
Short-duration Insurance Contracts, Historical Claims Duration, Year Nine 0.20%
Short-duration Insurance Contracts, Historical Claims Duration, Year Ten 0.20%
Standard Commercial Lines [Member] | Commercial Property [Member]  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Short-duration Insurance Contracts, Historical Claims Duration, Year One 70.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two 25.70%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three 2.80%
Short-duration Insurance Contracts, Historical Claims Duration, Year Four 1.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five 0.40%
Short-duration Insurance Contracts, Historical Claims Duration, Year Six 0.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Seven 0.10%
Short-duration Insurance Contracts, Historical Claims Duration, Year Eight 0.10%
Short-duration Insurance Contracts, Historical Claims Duration, Year Nine 0.10%
Short-duration Insurance Contracts, Historical Claims Duration, Year Ten 0.10%
Standard Personal Lines | Personal Automobile [Member]  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Short-duration Insurance Contracts, Historical Claims Duration, Year One 58.40%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two 18.80%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three 9.60%
Short-duration Insurance Contracts, Historical Claims Duration, Year Four 6.70%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five 4.20%
Short-duration Insurance Contracts, Historical Claims Duration, Year Six 1.30%
Short-duration Insurance Contracts, Historical Claims Duration, Year Seven 0.50%
Short-duration Insurance Contracts, Historical Claims Duration, Year Eight 0.20%
Short-duration Insurance Contracts, Historical Claims Duration, Year Nine 0.20%
Short-duration Insurance Contracts, Historical Claims Duration, Year Ten 0.10%
Standard Personal Lines | Homeowners [Member]  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Short-duration Insurance Contracts, Historical Claims Duration, Year One 71.90%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two 20.40%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three 3.30%
Short-duration Insurance Contracts, Historical Claims Duration, Year Four 1.70%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five 1.70%
Short-duration Insurance Contracts, Historical Claims Duration, Year Six 0.30%
Short-duration Insurance Contracts, Historical Claims Duration, Year Seven 0.10%
Short-duration Insurance Contracts, Historical Claims Duration, Year Eight 0.10%
Short-duration Insurance Contracts, Historical Claims Duration, Year Nine 0.10%
Short-duration Insurance Contracts, Historical Claims Duration, Year Ten 0.30%
E&S Lines [Member] | General Liability [Member]  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Short-duration Insurance Contracts, Historical Claims Duration, Year One 4.10%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two 12.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three 17.40%
Short-duration Insurance Contracts, Historical Claims Duration, Year Four 21.70%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five 13.50%
Short-duration Insurance Contracts, Historical Claims Duration, Year Six 9.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Seven 7.20%
Short-duration Insurance Contracts, Historical Claims Duration, Year Eight 3.50%
Short-duration Insurance Contracts, Historical Claims Duration, Year Nine 2.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Ten 2.00%