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Noncontrolling Interests (Tables)

9 Months Ended

Sep. 30, 2025

Noncontrolling Interest [Abstract]

Schedule of Noncontrolling Interest

The following table presents the nonredeemable 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 September 30, 2025 and December 31, 2024:

						September 30, 2025												December 31, 2024
$ in Millions						Nonredeemable Noncontrolling Percentage (1)						Nonredeemable Noncontrolling Equity						Nonredeemable Noncontrolling Percentage (1)						Nonredeemable Noncontrolling Equity
Nonredeemable noncontrolling interests:
Ark						27.9		%				$	480.7		(2)			27.9		%				$	410.4		(2)
HG Global						3.1		%				(11.9)						3.1		%				(13.4)
Kudu						8.8		%				135.5			(3)			9.6		%				127.6			(3)
Bamboo						27.2		%				97.8			(4)			27.2		%				113.6			(4)
Distinguished						13.1		%				75.3			(5)			—						—
Other						various						39.7						various						9.1
Total nonredeemable noncontrolling interests												$	817.1											$	647.3

(1) The nonredeemable noncontrolling percentage represents the basic ownership interests held by noncontrolling shareholders with the exception of HG Global, for which the nonredeemable noncontrolling percentage represents the preferred share ownership held by noncontrolling shareholders.

(2) As of September 30, 2025 and December 31, 2024, Ark’s nonredeemable noncontrolling interests include $66.6 and $42.9 related to management’s equity incentives.

(3) As of September 30, 2025 and December 31, 2024, Kudu’s nonredeemable noncontrolling interests include $48.8 and $47.9 related to management’s equity incentives.

(4) As of September 30, 2025 and December 31, 2024, Bamboo’s nonredeemable noncontrolling interests include $2.6 and $0.0 related to management’s equity incentives.

(5) As of September 30, 2025, Distinguished’s nonredeemable noncontrolling interests include $21.2 related to management’s equity incentives.

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- References

No definition available.

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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

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