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Common Shareholders’ Equity and Noncontrolling Interests (Tables) | 12 Months Ended
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Dec. 31, 2024
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, 2024 and 2023:
|  | December 31, 2024 |  | December 31, 2023 |
$ in Millions |  | Noncontrolling Percentage (1) |  | Noncontrolling Equity |  | Noncontrolling Percentage (1) |  | Noncontrolling Equity |
Noncontrolling interests: |  |  |  |  |  |  |  |  |
Ark |  | 27.9 | % |  | $ | 410.4 |  | (2) | 28.0 | % |  | $ | 336.9 |  | (2)
HG Global |  | 3.1 | % |  | (13.4) |  |  | 3.1 | % |  | .8 |  |
Kudu |  | 9.6 | % |  | 127.6 |  | (3) | 10.5 | % |  | 113.8 |  | (3)
Bamboo |  | 27.2 | % |  | 113.6 |  |  | — |  |  | — |  |
Other |  | various |  | 9.1 |  |  | various |  | 9.4 |  |
Total, excluding BAM |  |  |  | 647.3 |  |  |  |  | 460.9 |  |
BAM (4) |  | 100.0 | % |  | — |  |  | 100.0 | % |  | (139.8) |  |
Total noncontrolling interests |  |  |  | $ | 647.3 |  |  |  |  | $ | 321.1 |  |
(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, 2024 and 2023, Ark’s noncontrolling equity includes $42.9 and $21.0 related to management’s equity incentives. (3) As of December 31, 2024 and 2023, Kudu’s noncontrolling equity includes $47.9 and $38.7 related to management’s equity incentives. (4) Effective July 1, 2024, White Mountains no longer consolidates BAM. Through June 30, 2024, BAM’s results are attributed to noncontrolling interests in White Mountains’s consolidated financial statements.

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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 No definition available. + Details
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