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RESERVE FOR LOSSES AND LOSS EXPENSES (Tables)
3 Months Ended
Mar. 31, 2024
Insurance [Abstract]  
Summary of Reconciliation of Beginning and Ending Gross Reserve for Losses and Loss Expenses and Net Reserve for Unpaid Losses and Loss Expenses
The following table presents a reconciliation of the Company's beginning and ending gross reserve for losses and loss expenses and net reserve for unpaid losses and loss expenses:
Three months ended March 31,
20242023
Gross reserve for losses and loss expenses, beginning of period$16,434,018 $15,168,863 
Less reinsurance recoverable on unpaid losses and loss expenses, beginning of period(6,323,083)(5,831,172)
Net reserve for unpaid losses and loss expenses, beginning of period10,110,935 9,337,691 
Net incurred losses and loss expenses related to:
Current year728,671 724,680 
Prior years (4,038)
 728,671 720,642 
Net paid losses and loss expenses related to:
Current year(50,724)(38,662)
Prior years(612,571)(574,538)
 (663,295)(613,200)
Foreign exchange and other(48,602)46,094 
Net reserve for unpaid losses and loss expenses, end of period10,127,709 9,491,227 
Reinsurance recoverable on unpaid losses and loss expenses, end of period6,503,188 5,823,417 
Gross reserve for losses and loss expenses, end of period$16,630,897 $15,314,644 
Summary of Prior Year Loss Development The following table presents net prior year reserve development by segment:
  Three months ended March 31,
20242023
Favorable (Adverse)Favorable (Adverse)
Insurance$ $1,041 
Reinsurance 2,997 
Total$ $4,038 
Prior year reserve development by line of business was as follows:
Three months ended March 31,
20242023
Favorable (Adverse)Favorable (Adverse)
Property$8,011 $5,900 
Accident and health (304)
Marine and aviation(8,011)13,221 
Cyber 8,452 
Professional lines (12,594)
Credit and political risk 4,519 
Liability (18,153)
Total$ $1,041 
Prior year reserve development by line of business was as follows:
  Three months ended March 31,
  20242023
Favorable
(Adverse)
Favorable
(Adverse)
Accident and health$ $6,988 
Agriculture 11,891 
Marine and aviation (250)
Professional lines (3,225)
Credit and surety (546)
Motor (17,122)
Liability (32,853)
Run-off lines
Catastrophe 31,058 
Property 6,883 
Engineering 173 
Total run-off lines 38,114 
Total$ $2,997