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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
	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

X

- 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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+ References

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