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

12 Months Ended

Dec. 31, 2020

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, 2020 and 2019:

	December 31, 2020				December 31, 2019
$ in Millions	Non-controlling Percentage		Non-controlling Equity		Non-controlling Percentage		Non-controlling Equity
Non-controlling interests, excluding BAM
HG Global	3.1	%	$	13.5	3.1	%	$	14.4
NSM	3.4	%	17.0		3.6	%	14.9
Kudu	.7	%	2.3		.9	%	2.2
Other	various		2.4		various		(1.6)
Total, excluding BAM			35.2				29.9
BAM	100.0	%	(123.3)		100.0	%	(146.7)
Total non-controlling interests			$	(88.1)			$	(116.8)