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Equity Method Eligible Investments (Tables) | 9 Months Ended
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Sep. 30, 2024
Equity Method Investments and Joint Ventures [Abstract] |
Equity method investments | The following table presents the ownership interests and carrying values of White Mountains’s equity method eligible investments as of September 30, 2024 and December 31, 2023:
|  | September 30, 2024 |  | December 31, 2023
$ in Millions |  | Ownership Interest |  | Carrying Value |  | Ownership Interest |  | Carrying Value
Kudu’s Participation Contracts (1) |  | 4.1% - 30.0% |  | $ | 930.6 |  |  | 4.1% - 30.0% |  | $ | 890.5 |
Investment in MediaAlpha |  | 26.8% |  | 323.4 |  |  | 34.9% |  | 254.9 |
PassportCard/DavidShield |  | 53.8% |  | 150.0 |  |  | 53.8% |  | 150.0 |
Elementum |  | 26.6% |  | 35.0 |  |  | 26.6% |  | 35.0 |
Other equity method eligible investments, at fair value |  | Under 50.0% |  | 243.9 |  |  | Under 50.0% |  | 291.7 |
Other equity method eligible investments, at fair value |  | 50.0% and over |  | — |  |  | 50.0% and over |  | 24.8 |
(1) Ownership interest generally references basic ownership interest with the exception of Kudu’s Participation Contracts, which are noncontrolling equity interests in the form of revenue and earnings participation contracts.

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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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