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Common Shareholders’ Equity and Non-controlling Interests Common Shareholders’ Equity and Non-controlling Interests (Tables)
 12 Months Ended
Dec. 31, 2019
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, 2019 and 2018:
 
 
December 31, 2019
 
December 31, 2018
$ in Millions
 
Non-controlling Percentage
 
Non-controlling Equity
 
Non-controlling Percentage
 
Non-controlling Equity
Non-controlling interests, excluding BAM
 
 
 
 
 
 
 
 
HG Global
 
3.1
%
$
14.4

 
3.1
%
$
14.5

NSM
 
3.6
 
14.9

 
4.5
 
13.6

Other NSM
 
13.4
 
(.1
)
 
13.4
 
.3

Kudu
 
—
 
2.2

 
—
 
—

MediaAlpha
 
—
 
—

 
39.0
 
16.2

Other Operations
 
various
 
(1.5
)
 
various
 
1.1

Total, excluding BAM
 
 
 
29.9

 
 
 
45.7

 
 
 
 
 
 
 
 
 
BAM
 
100.0
 
(146.7
)
 
100.0
 
(170.6
)
Total non-controlling interests
 
 
 
$
(116.8
)
 

 
$
(124.9
)