Non-controlling Interest (Tables)

3 Months Ended

Mar. 31, 2017

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 March 31, 2017 and December 31, 2016:

	March 31, 2017					December 31, 2016
$ in millions	Non-controlling Percentage		Non-controlling Equity			Non-controlling Percentage		Non-controlling Equity
OneBeacon Ltd.	24.3	%	$	250.7		23.9	%	$	244.6
Other, excluding mutuals and reciprocals
HG Global	3.1		16.5			3.1		16.6
MediaAlpha	40.0		11.0			40.0		11.7
Wobi	5.0		1.0			5.0		.7
Dewar	18.8		3.4			18.8		3.9
Buzzmove	29.1		2.8			29.1		2.9
Total other, excluding mutuals and reciprocals			34.7					35.8
Mutuals and reciprocals
BAM	100.0		(153.0		)	100.0		(150.9		)
SSIE	—		—			100.0		4.4
Total mutuals and reciprocals			(153.0		)			(146.5		)
Total non-controlling interests			$	132.4				$	133.9