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v3.25.1

Segment Reporting - Summary of the Schedule of the Company's gross written premiums based on the location of the insured risk (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Segment Reporting Information [Line Items] |  |  |
Gross written premiums | $ 4,609.3 | $ 3,967.6 | $ 4,338.7
Australia/Asia |  |  |
Segment Reporting Information [Line Items] |  |  |
Gross written premiums | 177.8 | 177.8 | 257.5
Europe |  |  |
Segment Reporting Information [Line Items] |  |  |
Gross written premiums | 208.1 | 179.4 | 194.5
United Kingdom & Ireland |  |  |
Segment Reporting Information [Line Items] |  |  |
Gross written premiums | 614.8 | 532.5 | 485.8
United States & Canada |  |  |
Segment Reporting Information [Line Items] |  |  |
Gross written premiums | 2,947.0 | 2,472.0 | 2,715.7
Worldwide excluding United States |  |  |
Segment Reporting Information [Line Items] |  |  |
Gross written premiums | 33.4 | 28.8 | 24.2
Worldwide including United States |  |  |
Segment Reporting Information [Line Items] |  |  |
Gross written premiums | 435.0 | 417.2 | 541.7
Other (4) |  |  |
Segment Reporting Information [Line Items] |  |  |
Gross written premiums | $ 193.2 | $ 159.9 | $ 119.3

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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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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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