Common Shareholders’ Equity and Non-controlling Interests (Tables)

12 Months Ended

Dec. 31, 2022

Stockholders' Equity Note [Abstract]

Schedule of noncontrolling interest

The following table presents the balance of non-controlling interests included in White Mountains’s total equity and the related percentage of each consolidated entity’s total equity owned by non-controlling shareholders as of December 31, 2022 and 2021:

	December 31, 2022				December 31, 2021
$ in Millions	Non-controlling Percentage (1)		Non-controlling Equity		Non-controlling Percentage (1)		Non-controlling Equity
Non-controlling interests, excluding BAM
HG Global	3.1	%	$	(.6)	3.1	%	$	8.9
Ark	28.0	%	247.9		28.0	%	230.7
Kudu	10.8	%	75.1		2.5	%	12.4
NSM (2)	—	%	—		3.5	%	16.7
Other	various		20.4		various		11.9
Total, excluding BAM			342.8				280.6
BAM	100.0	%	(154.7)		100.0	%	(124.0)
Total non-controlling interests			$	188.1			$	156.6

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

(2) As a result of the NSM Transaction, NSM has been classified as discontinued operations through the closing of the transaction. See Note 21 — “Held for Sale and Discontinued Operations.”