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Equity Method Eligible Investments (Tables) | 12 Months Ended
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Dec. 31, 2025
Equity Method Investments and Joint Ventures [Abstract] |
Schedule of significant equity method eligible investments | The following table presents the ownership interests and carrying values of White Mountains’s equity method eligible investments as of December 31, 2025 and 2024:
|  | December 31, 2025 |  | December 31, 2024
$ in Millions |  | Ownership Interest |  | Carrying Value |  | Ownership Interest |  | Carrying Value
Kudu’s Participation Contracts (1) |  | 4.1% - 30.0% |  | $ | 1,285.0 |  |  | 4.1% - 30.0% |  | $ | 1,008.4 |
Bamboo SPV |  | 27.9% |  | 250.0 |  |  | —% |  | — |
Investment in MediaAlpha (2) |  | 27.4% |  | 231.2 |  |  | 26.6% |  | 201.6 |
PassportCard/DavidShield |  | 53.8% |  | 170.0 |  |  | 53.8% |  | 150.0 |
BroadStreet SPV |  | 10.9% |  | 160.0 |  |  | —% |  | — |
Elementum |  | 26.6% |  | 35.0 |  |  | 26.6% |  | 35.0 |
Other equity method eligible investments (3) |  | Under 50.0% |  | 266.0 |  |  | Under 50.0% |  | 243.7 |
(1) Ownership interest references basic ownership interest with the exception of Kudu’s Participation Contracts, which are generally noncontrolling equity interests in the form of revenue and earnings participation contracts. (2) MediaAlpha’s ownership interest as of December 31, 2025 is based on the total class A and class B common shares outstanding in MediaAlpha’s Report on Form 10-Q dated October 29, 2025. (3) Includes certain other unconsolidated entities, private equity funds and an ILS fund. The following tables present aggregated summarized financial information for White Mountains’s investments in equity method eligible unconsolidated entities:
|  | December 31, |  |
Millions |  | 2025 |  | 2024 |  |
Balance sheet data (1): |  |  |  |  |  |
Total assets |  | $ | 6,429.6 |  |  | $ | 3,719.1 |  |  |
Total liabilities |  | $ | 1,303.2 |  |  | $ | 1,063.9 |  |  |
(1) Financial data for White Mountains’s equity method eligible investees is generally reported on a one-quarter lag.
|  | Year Ended December 31, |  |
Millions |  | 2025 |  | 2024 |  | 2023 |  |
Income statement data (1): |  |  |  |  |  |  |  |
Total revenues |  | $ | 2,455.4 |  |  | $ | 2,011.8 |  |  | $ | 1,575.4 |  |  |
Total expenses |  | $ | 1,983.3 |  |  | $ | 1,634.9 |  |  | $ | 1,126.2 |  |  |
Net income (loss) |  | $ | 472.1 |  |  | $ | 376.9 |  |  | $ | 449.2 |  |  |
(1) Financial data for White Mountains’s equity method eligible investees is generally reported on a one-quarter lag.

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- Definition Tabular disclosure of equity method investments including, but not limited to, name of each investee or group of investments, percentage ownership, difference between recorded amount of an investment and the value of the underlying equity in the net assets, and summarized financial information. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 323 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481687/323-10-50-3 + Details
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