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Non-controlling Interests (Tables)
 9 Months Ended
Sep. 30, 2019
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, 2019 and December 31, 2018:
 
 
September 30, 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
%
 
$
14.9

 
3.1
%
 
$
14.5

NSM
 
3.6

 
15.2

 
4.5

 
13.6

Other NSM
 
13.4

 
.1

 
13.4

 
.3

Kudu
 
1.0

 
2.3

 
—

 
—

MediaAlpha
 
—

 
—

 
39.0

 
16.2

Other Operations
 
various

 
.2

 
various

 
1.1

Total, excluding BAM
 
 
 
32.7

 
 
 
45.7

BAM
 
100.0

 
(155.2
)
 
100.0

 
(170.6
)
Total non-controlling interests
 


 
$
(122.5
)
 
 
 
$
(124.9
)