Related Party Transactions |
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| Related Party Transactions [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Related Party Transactions Disclosure [Text Block] | Related Party Transactions The Company engages in certain related party transactions in the normal course of business at arm's length. Fund Management The Company provides investment and insurance management services through Nephila Holdings Ltd. (together with its subsidiaries, Nephila). Nephila serves as the investment manager to several Bermuda based private funds (the Nephila Funds). To provide access for the Nephila Funds to a variety of insurance-linked securities in the property catastrophe, climate and specialty insurance markets, Nephila also acts as an insurance manager to certain Bermuda licensed reinsurers and as the managing agent to Lloyd's Syndicate 2357 and Lloyd's Syndicate 2358 (collectively, the Nephila Reinsurers). Neither the Nephila Funds nor the Nephila Reinsurers are consolidated by the Company. Nephila receives management fees for investment and insurance management services based on either the net asset value of the accounts managed or gross premium volume for the underlying risks to which the investors subscribed. Nephila also may earn incentive fees from certain funds based on annual performance. For the quarter and six months ended June 30, 2025, total fund management revenues attributed to unconsolidated entities managed by Nephila were $29.1 million and $54.6 million, respectively. For the quarter and six months ended June 30, 2024, total fund management revenues attributed to unconsolidated entities managed by Nephila were $21.8 million and $41.1 million, respectively. Fronting The Company engages in fronting activities in both its State National business and its Markel Insurance business. Within both of these businesses, the Company's fronting activities include programs with the Nephila Reinsurers through which the Company writes insurance policies that are fully ceded to the Nephila Reinsurers in exchange for fronting fees. Through these programs, Nephila utilizes certain of the Company's licensed insurance companies to write a portion of its portfolio of U.S. catastrophe-exposed property and specialty risks. Gross premiums written through these programs that were ceded to the Nephila Reinsurers were $1.3 billion and $1.7 billion for the quarter and six months ended June 30, 2025, respectively. Gross premiums written through these programs that were ceded to the Nephila Reinsurers were $741.7 million and $1.1 billion for the quarter and six months ended June 30, 2024, respectively. As of June 30, 2025 and December 31, 2024, reinsurance recoverables on the consolidated balance sheets included $986.2 million and $968.9 million, respectively, due from the Nephila Reinsurers. Under its programs with the Nephila Reinsurers, the Company bears underwriting risk for annual aggregate agreement year losses in excess of a limit the Company believes is unlikely to be exceeded. To the extent losses under these programs exceed the prescribed limits, the Company is obligated to pay such losses to the cedents without recourse to the Nephila Reinsurers. While the Company believes losses under these programs are unlikely, those losses, if incurred, could be material to the Company's consolidated results of operations and financial condition. Beginning in the second quarter of 2024, in order for the Nephila Reinsurers to obtain reinsurance protection for a portion of their exposures, the Company also fronted ceded reinsurance contracts, primarily in the form of industry loss warranties, for the Nephila Reinsurers. Through this arrangement, the underlying risk of the Nephila Reinsurers was retroceded back to the Company and then fully ceded to third-party reinsurers. For the quarter and six months ended June 30, 2025, the Company's gross written premiums from the Nephila Reinsurers under this fronting program were $60.5 million and $74.2 million, respectively, all of which were ceded to third parties. For both the quarter and six months ended June 30, 2024, the Company's gross written premiums from the Nephila Reinsurers under this fronting program were $168.0 million, all of which were ceded to third parties. The Company has also entered into other assumed and ceded reinsurance transactions with the Nephila Reinsurers in the normal course of business, which are not material to the Company's consolidated financial statements. Hagerty The Company holds a minority ownership interest in Hagerty, Inc. (Hagerty), which operates primarily as a managing general agent focused on the global automobile enthusiast market and also includes Hagerty Reinsurance Limited (Hagerty Re), a Bermuda Class 3 reinsurance company. Through the Company's underwriting operations, the Company underwrites insurance for Hagerty, a portion of which is ceded to Hagerty Re. The amounts attributed to these arrangements are summarized in the following table.
As of June 30, 2025 and December 31, 2024, reinsurance recoverables on the consolidated balance sheets included $314.7 million and $308.8 million, respectively, due from Hagerty Re.
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