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Segment Reporting - Summary 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, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Gross premiums written | $ 474,123 | $ 400,811 | $ 1,517,247 | $ 1,305,421
Lloyd's of London |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Gross premiums written | 189,155 | 145,940 | 507,326 | 417,286
Ireland |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Gross premiums written | 96,272 | 110,263 | 271,002 | 255,539
U.S. |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Gross premiums written | 21,713 | 13,025 | 53,721 | 26,143
Total International |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Gross premiums written | 307,140 | 269,228 | 832,049 | 698,968
Bermuda |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Gross premiums written | $ 166,983 | $ 131,583 | $ 685,198 | $ 606,453

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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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