XML 98 R85.htm IDEA: XBRL DOCUMENT v3.8.0.1
Reserve for Loss and Loss Expense Reserve for Loss and Loss Expense (Historical Claims Duration) (Details)
Dec. 31, 2017
General Liability [Member] | Standard Commercial Lines [Member]  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Short-duration Insurance Contracts, Historical Claims Duration, Year One 6.60%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two 12.50%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three 15.40%
Short-duration Insurance Contracts, Historical Claims Duration, Year Four 16.70%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five 14.90%
Short-duration Insurance Contracts, Historical Claims Duration, Year Six 10.10%
Short-duration Insurance Contracts, Historical Claims Duration, Year Seven 6.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Eight 4.60%
Short-duration Insurance Contracts, Historical Claims Duration, Year Nine 2.20%
Short-duration Insurance Contracts, Historical Claims Duration, Year Ten 1.30%
General Liability [Member] | E&S Lines [Member]  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Short-duration Insurance Contracts, Historical Claims Duration, Year One 4.50%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two 12.50%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three 18.20%
Short-duration Insurance Contracts, Historical Claims Duration, Year Four 20.40%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five 15.50%
Short-duration Insurance Contracts, Historical Claims Duration, Year Six 8.30%
Workers Compensation [Member] | Standard Commercial Lines [Member]  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Short-duration Insurance Contracts, Historical Claims Duration, Year One 20.20%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two 23.90%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three 13.60%
Short-duration Insurance Contracts, Historical Claims Duration, Year Four 8.30%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five 5.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Six 3.90%
Short-duration Insurance Contracts, Historical Claims Duration, Year Seven 2.80%
Short-duration Insurance Contracts, Historical Claims Duration, Year Eight 2.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Nine 1.80%
Short-duration Insurance Contracts, Historical Claims Duration, Year Ten 1.90%
Commercial Automobile [Member] | Standard Commercial Lines [Member]  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Short-duration Insurance Contracts, Historical Claims Duration, Year One 38.20%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two 17.40%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three 14.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Four 12.80%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five 9.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Six 4.10%
Short-duration Insurance Contracts, Historical Claims Duration, Year Seven 1.60%
Short-duration Insurance Contracts, Historical Claims Duration, Year Eight 1.40%
Short-duration Insurance Contracts, Historical Claims Duration, Year Nine 0.70%
Short-duration Insurance Contracts, Historical Claims Duration, Year Ten 0.10%
Business Owners' Policies [Member] | Standard Commercial Lines [Member]  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Short-duration Insurance Contracts, Historical Claims Duration, Year One 46.60%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two 20.80%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three 8.10%
Short-duration Insurance Contracts, Historical Claims Duration, Year Four 7.50%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five 7.50%
Short-duration Insurance Contracts, Historical Claims Duration, Year Six 4.10%
Short-duration Insurance Contracts, Historical Claims Duration, Year Seven 2.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Eight 1.60%
Short-duration Insurance Contracts, Historical Claims Duration, Year Nine 0.10%
Short-duration Insurance Contracts, Historical Claims Duration, Year Ten 1.10%
Commercial Property [Member] | Standard Commercial Lines [Member]  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Short-duration Insurance Contracts, Historical Claims Duration, Year One 70.50%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two 25.60%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three 2.70%
Short-duration Insurance Contracts, Historical Claims Duration, Year Four 0.70%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five 0.40%
Short-duration Insurance Contracts, Historical Claims Duration, Year Six 0.10%
Short-duration Insurance Contracts, Historical Claims Duration, Year Seven 0.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Eight 0.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Nine 0.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Ten 0.00%
Personal Automobile [Member] | Standard Personal Lines [Member]  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Short-duration Insurance Contracts, Historical Claims Duration, Year One 56.10%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two 18.90%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three 10.70%
Short-duration Insurance Contracts, Historical Claims Duration, Year Four 7.40%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five 4.20%
Short-duration Insurance Contracts, Historical Claims Duration, Year Six 1.50%
Short-duration Insurance Contracts, Historical Claims Duration, Year Seven 0.40%
Short-duration Insurance Contracts, Historical Claims Duration, Year Eight 0.10%
Short-duration Insurance Contracts, Historical Claims Duration, Year Nine 0.20%
Short-duration Insurance Contracts, Historical Claims Duration, Year Ten 0.00%
Homeowners [Member] | Standard Personal Lines [Member]  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Short-duration Insurance Contracts, Historical Claims Duration, Year One 71.10%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two 21.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three 3.30%
Short-duration Insurance Contracts, Historical Claims Duration, Year Four 2.10%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five 1.60%
Short-duration Insurance Contracts, Historical Claims Duration, Year Six 0.10%
Short-duration Insurance Contracts, Historical Claims Duration, Year Seven 0.00%
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%