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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, 2023
Dec. 31, 2022
Dec. 31, 2021
Revenues from External Customers and Long-Lived Assets [Line Items]      
Gross premiums written (Note 7) $ 8,862,366 $ 9,213,540 $ 7,833,798
Property      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Gross premiums written (Note 7) 3,562,414 3,734,241 3,958,724
Property | U.S. and Caribbean      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Gross premiums written (Note 7) 2,303,013 2,343,830 2,257,088
Property | Worldwide      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Gross premiums written (Note 7) 798,623 1,053,369 1,188,737
Property | Europe      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Gross premiums written (Note 7) 163,500 62,998 253,678
Property | Japan      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Gross premiums written (Note 7) 85,823 104,767 114,981
Property | Worldwide (excluding U.S.)      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Gross premiums written (Note 7) 70,646 37,436 34,742
Property | Australia and New Zealand      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Gross premiums written (Note 7) 70,107 86,080 69,188
Property | Other      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Gross premiums written (Note 7) 70,702 45,761 40,310
Casualty and Specialty      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Gross premiums written (Note 7) 5,299,952 5,479,299 3,875,074
Casualty and Specialty | U.S. and Caribbean      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Gross premiums written (Note 7) 2,333,096 2,556,466 1,721,663
Casualty and Specialty | Worldwide      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Gross premiums written (Note 7) 2,280,687 2,328,030 1,746,450
Casualty and Specialty | Europe      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Gross premiums written (Note 7) 197,228 327,831 217,721
Casualty and Specialty | Worldwide (excluding U.S.)      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Gross premiums written (Note 7) 130,334 177,746 108,376
Casualty and Specialty | Australia and New Zealand      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Gross premiums written (Note 7) 27,397 35,973 29,001
Casualty and Specialty | Other      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Gross premiums written (Note 7) $ 331,210 $ 53,253 $ 51,863