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Common Shareholders’ Equity and Non-controlling Interests Common Shareholders’ Equity and Non-controlling Interests (Tables)
 12 Months Ended
Dec. 31, 2017
Noncontrolling Interest [Abstract]  
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, 2017 and 2016:
 
 
December 31, 2017
 
December 31, 2016
$ in millions
 
Non-controlling Percentage
 
Non-controlling Equity
 
Non-controlling Percentage
 
Non-controlling Equity
OneBeacon
 
—
%
 
$
—

 
23.9
%
 
$
244.6

 
 
 
 
 
 
 
 
 
Other, excluding mutuals and reciprocals
 
 
 
 
 
 
 
 
HG Global
 
3.1

 
15.9

 
3.1

 
16.6

MediaAlpha
 
35.7

 
13.1

 
40.0

 
11.7

Dewar (1)
 
—

 
—

 
18.8

 
3.9

Buzzmove
 
22.9

 
2.5

 
29.1

 
3.0

Total other, excluding mutuals and reciprocals
 
 
 
31.5

 
 
 
35.2

 
 
 
 
 
 
 
 
 
Mutuals and reciprocals
 
 
 
 
 
 
 
 
BAM
 
100.0

 
(163.2
)
 
100.0

 
(150.9
)
SSIE
 
—

 
—

 
100.0

 
4.4

Total mutuals and reciprocals
 
 
 
(163.2
)
 
 
 
(146.5
)
Total non-controlling interests
 
 
 
$
(131.7
)
 
 
 
$
133.3


(1) Dewar is a subsidiary of OneBeacon.