SEGMENT INFORMATION - Summary of Gross Premiums Written by Geographical Location of Subsidiaries (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Revenues from External Customers and Long-Lived Assets [Line Items]
Gross premiums written	$ 9,005,888	$ 8,356,525	$ 8,214,595
U.S.
Revenues from External Customers and Long-Lived Assets [Line Items]
Gross premiums written	4,864,074	4,484,789	4,342,707
Ireland
Revenues from External Customers and Long-Lived Assets [Line Items]
Gross premiums written	1,923,006	1,837,177	1,931,815
Lloyd's of London
Revenues from External Customers and Long-Lived Assets [Line Items]
Gross premiums written	1,998,217	1,759,990	1,567,458
Bermuda
Revenues from External Customers and Long-Lived Assets [Line Items]
Gross premiums written	$ 220,591	$ 274,569	$ 372,615