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Held for Sale
 12 Months Ended
Dec. 31, 2025
Discontinued Operations and Disposal Groups [Abstract]  
Held for Sale Held for Sale
On December 5, 2025, White Mountains completed the Bamboo Sale Transaction. See Note 2 — “Significant Transactions” on page F-19. As a result, the Bamboo Group’s assets and liabilities have been presented as held for sale as of December 31, 2024. The following table summarizes the Bamboo Group’s assets and liabilities classified as held for sale as of December 31, 2024:
MillionsDecember 31, 2024
Assets held for sale
Fixed maturity investments, at fair value$40.7 
Short-term investments, at fair value 17.3 
Total investments58.0 
Cash (restricted $59.5)
74.5 
Premiums, commissions and fees receivable70.0 
Goodwill and other intangible assets355.0 
Other assets28.2 
Total assets held for sale585.7 
Liabilities held for sale
Loss and loss adjustment expense reserves17.8 
Unearned insurance premiums31.5 
Premiums and commissions payable88.1 
Other liabilities30.3 
Total liabilities held for sale167.7 
Net assets held for sale$418.0 
In addition, White Mountains reported assets and liabilities held for sale related to the pending sale of an Other Operating Business. As of December 31, 2025 and 2024, amounts held for sale related to this Other Operating Business included $5.0 million and $6.5 million of short-term investments, cash and other assets, as well as $3.6 million and $5.9 million of other liabilities.