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Segment Reporting - Schedule of Gross Premiums Written by Geographical Location of Subsidiaries (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Gross premiums written | $ 553,401 | $ 474,123 | $ 1,878,645 | $ 1,517,247
Total International |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Gross premiums written | 325,525 | 307,140 | 957,981 | 832,049
Lloyd's of London |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Gross premiums written | 192,380 | 189,155 | 590,339 | 507,326
Ireland |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Gross premiums written | 99,650 | 96,272 | 283,776 | 271,002
U.S. |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Gross premiums written | 33,495 | 21,713 | 83,866 | 53,721
Bermuda |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Gross premiums written | $ 227,876 | $ 166,983 | $ 920,664 | $ 685,198

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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/1943274/2147479032/944-605-50-1 + Details
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