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SEGMENT INFORMATION - Summary of Gross Premiums Written by Geographical Location of Subsidiaries (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Revenues from External Customers and Long-Lived Assets [Line Items]      
Gross premiums written $ 8,356,525 $ 8,214,595 $ 7,685,984
U.S.      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Gross premiums written 4,484,789 4,342,707 4,002,748
Ireland      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Gross premiums written 1,837,177 1,931,815 1,667,496
Lloyd's of London      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Gross premiums written 1,759,990 1,567,458 1,473,047
Bermuda      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Gross premiums written $ 274,569 $ 372,615 $ 542,693