SEGMENT INFORMATION - Summary of Gross Premiums Written by Geographical Location of Subsidiaries (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Revenues from External Customers and Long-Lived Assets [Line Items]
Gross premiums written	$ 8,214,595	$ 7,685,984	$ 6,826,938
U.S.
Revenues from External Customers and Long-Lived Assets [Line Items]
Gross premiums written	4,342,707	4,002,748	3,398,108
Ireland
Revenues from External Customers and Long-Lived Assets [Line Items]
Gross premiums written	1,931,815	1,667,496	1,516,596
Lloyd's of London
Revenues from External Customers and Long-Lived Assets [Line Items]
Gross premiums written	1,567,458	1,473,047	1,309,802
Bermuda
Revenues from External Customers and Long-Lived Assets [Line Items]
Gross premiums written	$ 372,615	$ 542,693	$ 602,432