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SEGMENT REPORTING - Schedule of Gross Premiums Written Allocated to the Territory of Coverage Exposure (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 (Note 7)	$ 11,733,066	$ 8,862,366	$ 9,213,540
Gross Premiums Written, Benchmark | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk , percentage	100.00%	100.00%	100.00%
Property
Revenues from External Customers and Long-Lived Assets [Line Items]
Gross premiums written (Note 7)	$ 4,823,731	$ 3,562,414	$ 3,734,241
Property | Gross Premiums Written, Benchmark | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk , percentage	41.10%	40.30%	40.50%
Property | U.S. and Caribbean
Revenues from External Customers and Long-Lived Assets [Line Items]
Gross premiums written (Note 7)	$ 2,996,981	$ 2,303,013	$ 2,343,830
Property | U.S. and Caribbean | Gross Premiums Written, Benchmark | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk , percentage	25.50%	26.00%	25.50%
Property | Worldwide
Revenues from External Customers and Long-Lived Assets [Line Items]
Gross premiums written (Note 7)	$ 1,063,292	$ 798,623	$ 1,053,369
Property | Worldwide | Gross Premiums Written, Benchmark | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk , percentage	9.10%	9.00%	11.40%
Property | Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Gross premiums written (Note 7)	$ 244,523	$ 163,500	$ 62,998
Property | Europe | Gross Premiums Written, Benchmark | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk , percentage	2.10%	1.90%	0.70%
Property | Worldwide (excluding U.S.)
Revenues from External Customers and Long-Lived Assets [Line Items]
Gross premiums written (Note 7)	$ 180,688	$ 70,646	$ 37,436
Property | Worldwide (excluding U.S.) | Gross Premiums Written, Benchmark | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk , percentage	1.50%	0.80%	0.40%
Property | Japan
Revenues from External Customers and Long-Lived Assets [Line Items]
Gross premiums written (Note 7)	$ 106,533	$ 85,823	$ 104,767
Property | Japan | Gross Premiums Written, Benchmark | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk , percentage	0.90%	1.00%	1.10%
Property | Australia and New Zealand
Revenues from External Customers and Long-Lived Assets [Line Items]
Gross premiums written (Note 7)	$ 101,976	$ 70,107	$ 86,080
Property | Australia and New Zealand | Gross Premiums Written, Benchmark | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk , percentage	0.90%	0.80%	0.90%
Property | Other
Revenues from External Customers and Long-Lived Assets [Line Items]
Gross premiums written (Note 7)	$ 129,738	$ 70,702	$ 45,761
Property | Other | Gross Premiums Written, Benchmark | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk , percentage	1.10%	0.80%	0.50%
Casualty and Specialty
Revenues from External Customers and Long-Lived Assets [Line Items]
Gross premiums written (Note 7)	$ 6,909,335	$ 5,299,952	$ 5,479,299
Casualty and Specialty | Gross Premiums Written, Benchmark | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk , percentage	58.90%	59.70%	59.50%
Casualty and Specialty | U.S. and Caribbean
Revenues from External Customers and Long-Lived Assets [Line Items]
Gross premiums written (Note 7)	$ 2,986,956	$ 2,333,096	$ 2,556,466
Casualty and Specialty | U.S. and Caribbean | Gross Premiums Written, Benchmark | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk , percentage	25.50%	26.30%	27.70%
Casualty and Specialty | Worldwide
Revenues from External Customers and Long-Lived Assets [Line Items]
Gross premiums written (Note 7)	$ 3,217,662	$ 2,280,687	$ 2,328,030
Casualty and Specialty | Worldwide | Gross Premiums Written, Benchmark | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk , percentage	27.30%	25.70%	25.30%
Casualty and Specialty | Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Gross premiums written (Note 7)	$ 353,863	$ 197,228	$ 327,831
Casualty and Specialty | Europe | Gross Premiums Written, Benchmark | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk , percentage	3.00%	2.20%	3.60%
Casualty and Specialty | Worldwide (excluding U.S.)
Revenues from External Customers and Long-Lived Assets [Line Items]
Gross premiums written (Note 7)	$ 195,489	$ 130,334	$ 177,746
Casualty and Specialty | Worldwide (excluding U.S.) | Gross Premiums Written, Benchmark | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk , percentage	1.70%	1.50%	1.90%
Casualty and Specialty | Australia and New Zealand
Revenues from External Customers and Long-Lived Assets [Line Items]
Gross premiums written (Note 7)	$ 43,183	$ 27,397	$ 35,973
Casualty and Specialty | Australia and New Zealand | Gross Premiums Written, Benchmark | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk , percentage	0.40%	0.30%	0.40%
Casualty and Specialty | Other
Revenues from External Customers and Long-Lived Assets [Line Items]
Gross premiums written (Note 7)	$ 112,182	$ 331,210	$ 53,253
Casualty and Specialty | Other | Gross Premiums Written, Benchmark | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk , percentage	1.00%	3.70%	0.60%

X

- Definition

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