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Common Shareholders’ Equity and Noncontrolling Interests (Tables) | 12 Months Ended
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Dec. 31, 2025
Equity [Abstract] |
Schedule of noncontrolling interest | The following table presents the balance of noncontrolling interests included in White Mountains’s total equity and the related percentage of each consolidated entity’s total equity owned by noncontrolling shareholders as of December 31, 2025 and 2024:
|  | December 31, 2025 |  | December 31, 2024 |
$ in Millions |  | Nonredeemable Noncontrolling Percentage (1) |  | Nonredeemable Noncontrolling Equity |  | Nonredeemable Noncontrolling Percentage (1) |  | Nonredeemable Noncontrolling Equity |
Nonredeemable noncontrolling interests: |  |  |  |  |  |  |  |  |
Ark (2) |  | 27.9 | % |  | $ | 465.2 |  |  | 27.9 | % |  | $ | 410.4 |  |
HG Global |  | 3.1 | % |  | (18.4) |  |  | 3.1 | % |  | (13.4) |  |
Kudu (3) |  | 8.8 | % |  | 141.2 |  |  | 9.6 | % |  | 127.6 |  |
Bamboo |  | — | % |  | — |  |  | 27.2 | % |  | 113.6 |  |
Distinguished (4) |  | 13.1 | % |  | 73.7 |  |  | — |  |  | — |  |
Other |  | various |  | 36.5 |  |  | various |  | 9.1 |  |
Total nonredeemable noncontrolling interests |  |  |  | $ | 698.2 |  |  |  |  | $ | 647.3 |  |
(1) The noncontrolling percentage represents the basic ownership interests held by noncontrolling shareholders with the exception of HG Global, for which the noncontrolling percentage represents the preferred share ownership held by noncontrolling shareholders. (2) As of December 31, 2025 and 2024, Ark’s noncontrolling equity includes $58.6 and $42.9 related to management’s equity incentives. (3) As of December 31, 2025 and 2024, Kudu’s noncontrolling equity includes $52.3 and $47.9 related to management’s equity incentives. (4) As of December 31, 2025, Distinguished’s nonredeemable noncontrolling interests include $33.3 related to management’s equity incentives.

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- Definition Tabular disclosure of redeemable noncontrolling interest (as defined) included in the statement of financial position as either a liability or temporary equity. As of the date of the statement of financial position, such redeemable noncontrolling interest is currently redeemable, as defined, for cash or other assets of the entity at (1) at a fixed or determinable price on a fixed or determinable date, (2) at the option of the holder of the noncontrolling interest, or (3) upon occurrence of an event that is not solely within the control of the entity. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 480 -SubTopic 10 -Name Accounting Standards Codification -Section S45 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479887/480-10-S45-3 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 480 -SubTopic 10 -Name Accounting Standards Codification -Section S50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479857/480-10-S50-3 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 480 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 3A -Subparagraph (24) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480244/480-10-S99-3A + Details
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