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Non-controlling Interest (Tables)
 9 Months Ended
Sep. 30, 2018
Noncontrolling Interest [Abstract]  
Non-controlling Interests
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 September 30, 2018 and December 31, 2017:
 
 
September 30, 2018
 
December 31, 2017
$ in millions
 
Non-controlling Percentage
 
Non-controlling Equity
 
Non-controlling Percentage
 
Non-controlling Equity
Other, excluding mutuals
 
 
 
 
 
 
 
 
HG Global
 
3.1
%
 
$
14.8

 
3.1
%
 
$
15.9

NSM
 
5.0

 
14.1

 
—

 
—

MediaAlpha
 
37.8

 
15.3

 
35.7

 
13.1

Buzzmove
 
22.9

 
1.5

 
22.9

 
2.5

Total other, excluding mutuals
 
 
 
45.7

 
 
 
31.5

Mutuals
 
 
 
 
 
 
 
 
BAM
 
100.0

 
(190.1
)
 
100.0

 
(163.2
)
Total non-controlling interests
 


 
$
(144.4
)
 
 
 
$
(131.7
)