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Equity Method Eligible Investments (Tables)
 9 Months Ended
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, 2024December 31, 2023
$ in MillionsOwnership InterestCarrying ValueOwnership InterestCarrying Value
Kudu’s Participation Contracts (1)
4.1% - 30.0%
$930.6 
4.1% - 30.0%
$890.5 
Investment in MediaAlpha26.8%323.4 34.9%254.9 
PassportCard/DavidShield53.8%150.0 53.8%150.0 
Elementum26.6%35.0 26.6%35.0 
Other equity method eligible investments, at fair valueUnder 50.0%243.9 Under 50.0%291.7 
Other equity method eligible investments, at fair value50.0% and over— 50.0% and over24.8 
(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.