Non-controlling Interest (Tables)

6 Months Ended

Jun. 30, 2016

Noncontrolling Interest [Abstract]

Noncontrolling Interest Disclosure

The following table details 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 June 30, 2016 and December 31, 2015:

	June 30, 2016					December 31, 2015
$ in millions	Non-controlling Percentage		Non-controlling Equity			Non-controlling Percentage		Non-controlling Equity
OneBeacon Ltd.	23.9	%	$	244.8		24.5	%	$	245.6
SIG Preference Shares	N/A		—			100.0		250.0
Other, excluding mutuals and reciprocals
HG Global	3.1		17.0			3.1		17.1
MediaAlpha	40.0		13.2			40.0		14.4
Tranzact	36.8		79.2			36.8		79.4
Wobi	3.5		.5			3.9		.6
Dewar	18.8		3.7			18.6		3.7
Total other, excluding mutuals and reciprocals			113.6					115.2
Mutuals and reciprocals
BAM	100.0		(138.0		)	100.0		(140.0		)
SSIE	100.0		3.8			100.0		(16.0		)
Total mutuals and reciprocals			(134.2		)			(156.0		)
Total non-controlling interests			$	224.2				$	454.8