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

12 Months Ended

Dec. 31, 2015

Noncontrolling Interest [Abstract]

Noncontrolling Interest

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 December 31, 2015 and 2014:

		December 31, 2015							December 31, 2014
$ in millions		Non-controlling Percentage			Non-controlling Equity				Non-controlling Percentage			Non-controlling Equity
OneBeacon Ltd.		24.5	%		$	245.6			24.7	%		$	258.4
SIG Preference Shares		100.0			250.0				100.0			250.0
Other, excluding mutuals and reciprocals
HG Global		3.1			17.1				3.1			17.9
MediaAlpha		40.0			14.4				40.0			22.6
Tranzact		36.8			79.4				36.8			88.2
Wobi		3.9			.6				36.7			5.4
Prospector Offshore Fund		—			—				23.4			31.1
Dewar		19.0			3.7				18.0			3.4
Total other, excluding mutuals and      reciprocals					115.2							168.6
Mutuals and reciprocals
BAM		100.0			(140.0		)		100.0			(121.9		)
SSIE		100.0			(16.0		)		100.0			(12.4		)
Total non-controlling interests					$	454.8						$	542.7

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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.

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