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Equity Method Eligible Investments (Tables)
 9 Months Ended
Sep. 30, 2023
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, 2023 and December 31, 2022:
September 30, 2023December 31, 2022
$ in Millions
Ownership Interest (1)
Carrying Value
Ownership Interest (1)
Carrying Value
Kudu’s Participation Contracts
4.1% - 30.0%
$775.3 
4.1% - 30.0%
$695.9 
Investment in MediaAlpha35.3%188.8 27.1%168.6 
PassportCard/DavidShield53.8%150.0 53.8%135.0 
Elementum Holdings, L.P.26.6%35.0 29.7%30.0 
Other equity method eligible investments, at fair valueUnder 50.0%279.0 Under 50.0%84.4 
Other equity method eligible investments, at fair value50.0% and over25.2 50.0% and over— 
(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.