XML 118 R94.htm IDEA: XBRL DOCUMENT v3.24.0.1
RESERVE FOR LOSSES AND LOSS EXPENSES - Reconciliation of Development Tables to Consolidated Balance Sheet (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Claims Development [Line Items]        
Net outstanding liabilities $ 10,436,507      
Reinsurance recoverable on unpaid claims 6,323,083 $ 5,831,172 $ 5,017,611 $ 4,496,641
Gross outstanding liabilities 16,759,590      
Unallocated claims adjustment expenses 183,260      
Foreign exchange and other 12,442      
Ceded reserves related to retroactive transactions (521,274)      
Reserve for losses and loss expenses 16,434,018 $ 15,168,863 $ 14,653,094 $ 13,926,766
Insurance        
Claims Development [Line Items]        
Net outstanding liabilities 5,166,419      
Reinsurance recoverable on unpaid claims 4,477,039      
Gross outstanding liabilities 9,643,458      
Insurance | Property        
Claims Development [Line Items]        
Net outstanding liabilities 662,936      
Reinsurance recoverable on unpaid claims 402,222      
Gross outstanding liabilities 1,065,158      
Insurance | Accident and health        
Claims Development [Line Items]        
Net outstanding liabilities 114,493      
Reinsurance recoverable on unpaid claims 3,006      
Gross outstanding liabilities 117,499      
Insurance | Marine and aviation        
Claims Development [Line Items]        
Net outstanding liabilities 678,482      
Reinsurance recoverable on unpaid claims 278,215      
Gross outstanding liabilities 956,697      
Insurance | Cyber        
Claims Development [Line Items]        
Net outstanding liabilities 322,071      
Reinsurance recoverable on unpaid claims 430,627      
Gross outstanding liabilities 752,698      
Insurance | Professional lines        
Claims Development [Line Items]        
Net outstanding liabilities 1,930,348      
Reinsurance recoverable on unpaid claims 1,442,546      
Gross outstanding liabilities 3,372,894      
Insurance | Credit and political risk        
Claims Development [Line Items]        
Net outstanding liabilities 125,355      
Reinsurance recoverable on unpaid claims 35,191      
Gross outstanding liabilities 160,546      
Insurance | Liability        
Claims Development [Line Items]        
Net outstanding liabilities 1,332,734      
Reinsurance recoverable on unpaid claims 1,885,232      
Gross outstanding liabilities 3,217,966      
Reinsurance        
Claims Development [Line Items]        
Net outstanding liabilities 5,270,088      
Reinsurance recoverable on unpaid claims 1,846,044      
Gross outstanding liabilities 7,116,132      
Reinsurance | Accident and health        
Claims Development [Line Items]        
Net outstanding liabilities 194,150      
Reinsurance recoverable on unpaid claims 49,314      
Gross outstanding liabilities 243,464      
Reinsurance | Marine and aviation        
Claims Development [Line Items]        
Net outstanding liabilities 138,264      
Reinsurance recoverable on unpaid claims 33,185      
Gross outstanding liabilities 171,449      
Reinsurance | Professional lines        
Claims Development [Line Items]        
Net outstanding liabilities 1,054,117      
Reinsurance recoverable on unpaid claims 370,345      
Gross outstanding liabilities 1,424,462      
Reinsurance | Liability        
Claims Development [Line Items]        
Net outstanding liabilities 1,738,680      
Reinsurance recoverable on unpaid claims 690,141      
Gross outstanding liabilities 2,428,821      
Reinsurance | Agriculture        
Claims Development [Line Items]        
Net outstanding liabilities 147,622      
Reinsurance recoverable on unpaid claims 8,343      
Gross outstanding liabilities 155,965      
Reinsurance | Credit and surety        
Claims Development [Line Items]        
Net outstanding liabilities 278,501      
Reinsurance recoverable on unpaid claims 103,174      
Gross outstanding liabilities 381,675      
Reinsurance | Motor        
Claims Development [Line Items]        
Net outstanding liabilities 1,020,952      
Reinsurance recoverable on unpaid claims 315,344      
Gross outstanding liabilities 1,336,296      
Reinsurance | Run-off lines        
Claims Development [Line Items]        
Net outstanding liabilities 697,802      
Reinsurance recoverable on unpaid claims 276,198      
Gross outstanding liabilities $ 974,000