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RESERVE FOR LOSSES AND LOSS EXPENSES (Tables)
 6 Months Ended
Jun. 30, 2025
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:
Six months ended June 30,
20252024
Gross reserve for losses and loss expenses, beginning of period$17,218,929 $16,434,018 
Less reinsurance recoverable on unpaid losses and loss expenses, beginning of period(6,840,897)(6,323,083)
Net reserve for unpaid losses and loss expenses, beginning of period10,378,032 10,110,935 
Net incurred losses and loss expenses related to:
Current year1,625,845 1,494,659 
Prior years(38,166)— 
 1,587,679 1,494,659 
Net paid losses and loss expenses related to:
Current year(166,553)(159,455)
Prior years(1,395,871)(1,251,637)
 (1,562,424)(1,411,092)
Foreign exchange and other(1,611,164)(47,452)
Net reserve for unpaid losses and loss expenses, end of period8,792,123 10,147,050 
Reinsurance recoverable on unpaid losses and loss expenses, end of period9,086,900 6,591,821 
Gross reserve for losses and loss expenses, end of period$17,879,023 $16,738,871 
Summary of Prior Year Loss Development The following table presents net favorable (adverse) prior year reserve development by segment:
  Three months ended June 30,Six months ended June 30,
2025202420252024
Favorable (Adverse)Favorable (Adverse)Favorable (Adverse)Favorable (Adverse)
Insurance$15,216 $— $29,194 $— 
Reinsurance5,013 — 8,972 — 
Total$20,229 $— $38,166 $— 
Prior year reserve development by reserve class was as follows:
Three months ended June 30,Six months ended June 30,
2025202420252024
Favorable (Adverse)Favorable (Adverse)Favorable (Adverse)Favorable (Adverse)
Property
$6,980 $— $16,976 $8,011 
Casualty
— — — — 
Specialty other
8,236 — 12,218 (8,011)
Total$15,216 $— $29,194 $— 
Prior year reserve development by reserve class was as follows:
  Three months ended June 30,Six months ended June 30,
  2025202420252024
Favorable
(Adverse)		Favorable
(Adverse)		Favorable
(Adverse)		Favorable
(Adverse)
Casualty
$— $— $— $— 
Specialty
5,013 — 8,847 — 
Run-off
— — 125 — 
Total$5,013 $— $8,972 $— 
Summary of the Lines of Business Categories by Reserve Class
The following table maps the Company's lines of business to reserve classes:
Insurance segment
Reserve class
Property
Casualty
Specialty other
Reported lines of business
PropertyX
Professional linesX
Liability
X
CyberX
Marine and aviation
X
Accident and healthX
Credit and political risk
X
The following table maps the Company's lines of business to reserve classes:
Reinsurance segment
Reserve class
Casualty
Specialty
Run-off
Reported lines of business
Liability
X
Professional lines
X
Motor
X
Accident and health
X
Credit and surety
X
Agriculture
X
Marine and aviation
X
Catastrophe
X
Property
X
Engineering
X