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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

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- Definition Amount of direct and assumed premiums written. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 1 -SubTopic 605 -Topic 944 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479655/944-605-50-1 + Details
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