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Goodwill and Other Intangible Assets - Narrative (Details) - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Nov. 01, 2023 | Dec. 31, 2021
Goodwill and Intangible Assets [Line Items] |  |  |  |
Amortization of intangible assets | $ 13,600,000 | $ 6,500,000 |  |
Impairment of indefinite-lived intangible asset | 0 | 0 |  |
Validus |  |  |  |
Goodwill and Intangible Assets [Line Items] |  |  |  |
Identifiable intangible assets | 453,066,000 |  | $ 460,884,000 |
Goodwill and Other Intangible Assets |  |  |  |
Goodwill and Intangible Assets [Line Items] |  |  |  |
Goodwill, gross | 302,800,000 | 213,200,000 |  | $ 213,200,000
Goodwill, accumulated impairment loss | 2,300,000 | 2,300,000 |  |
Goodwill and Other Intangible Assets Included in Investments in Other Ventures, Under Equity Method |  |  |  |
Goodwill and Intangible Assets [Line Items] |  |  |  |
Goodwill, gross | 15,300,000 | 14,400,000 |  | $ 14,400,000
Goodwill, accumulated impairment loss | $ 4,500,000 | $ 4,500,000 |  |
Low |  |  |  |
Goodwill and Intangible Assets [Line Items] |  |  |  |
Finite-lived intangible assets, useful life | 3 months 18 days |  |  |
High |  |  |  |
Goodwill and Intangible Assets [Line Items] |  |  |  |
Finite-lived intangible assets, useful life | 14 years 9 months 18 days |  |  |
Weighted Average or Actual |  |  |  |
Goodwill and Intangible Assets [Line Items] |  |  |  |
Finite-lived intangible assets, useful life | 13 years 4 months 24 days |  |  |

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- Definition Schedule of Goodwill and Intangible Assets [Line Items] + References No definition available. + Details
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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-28 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482686/350-30-45-2 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482665/350-30-50-2 + Details
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- Definition Amount of intangible assets, excluding goodwill, acquired at the acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479907/805-20-50-1 + Details
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- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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