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Investment Funds
 9 Months Ended
Sep. 30, 2025
Equity Method Investments and Joint Ventures [Abstract]  
Investment Funds Investment Funds
    The Company evaluates whether it is an investor in a variable interest entity ("VIE"). Such entities do not have sufficient equity at risk to finance their activities without additional subordinated financial support, or the equity investors, as a group, do not have the characteristics of a controlling financial interest (primary beneficiary). The Company determines whether it is the primary beneficiary of an entity subject to consolidation based on a qualitative assessment of the VIE's capital structure, contractual terms, nature of the VIE's operations and purpose, and the Company's relative exposure to the related risks of the VIE on the date it becomes initially involved in the VIE and on an ongoing basis. The Company is not the primary beneficiary in any of its investment funds, and accordingly, carries its interests in investment funds under the equity method of accounting.    
    The Company’s maximum exposure to loss with respect to these investments is limited to the carrying amount reported on the Company’s consolidated balance sheet and its unfunded commitments, which were $252 million as of September 30, 2025.
    Investment funds consisted of the following:
Carrying Value as of Income (Loss) from
Investment Funds
September 30,December 31,For the Nine Months
Ended September 30,
(In thousands)2025202420252024
Financial services$374,134 $430,163 $9,917 $(16,908)
Transportation272,874 286,426 29,325 962 
Real Estate177,082 178,685 2,054 11,471 
Infrastructure164,911 151,560 10,279 12,730 
Energy42,429 42,776 667 9,473 
Other funds399,561 378,636 7,471 (16,860)
Total$1,430,991 $1,468,246 $59,713 $868 
    The Company's share of the earnings or losses from investment funds is generally reported on a one-quarter lag in order to facilitate the timely completion of the Company's consolidated financial statements.
Financial services investment funds include the minority investment in Lifson Re Ltd. ("Lifson Re"), a Bermuda reinsurance company. Lifson Re participated on a fully collateralized basis in a majority of the Company’s reinsurance placements for a 30.0% share of placed amounts in 2024, which percentage was increased to 32.5% effective January 1, 2025. This pertains to all traditional reinsurance/retrocessional placements for both property and casualty business where there is more than one open market reinsurer participating. For the nine months ended September 30, 2025 and 2024, the Company ceded approximately $482 million and $315 million, respectively, of written premiums to Lifson Re.
Other funds include deferred compensation trust assets of $42 million and $38 million as of September 30, 2025 and December 31, 2024, respectively. These assets support other liabilities reflected in the balance sheet of an equal amount for employees who have elected to defer a portion of their compensation. The change in the net asset value of the trust is recorded in other funds within net investment income with an offsetting equal amount within corporate expenses.