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SCHEDULE IV REINSURANCE
 12 Months Ended
Dec. 31, 2019
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Abstract]  
SCHEDULE IV REINSURANCE
WHITE MOUNTAINS INSURANCE GROUP, LTD.
REINSURANCE (1) 

Column A
 
Column B
 
Column C
 
Column D
 
Column E
 
Column F
$ in Millions

Premiums Earned
 
Gross Amount
 
Ceded to Other
Companies
 
Assumed from
Other Companies
 
Net Amount
 
Percentage of
Amount Assumed
to Net
Year ended:
 
 

 
 

 
 

 
 

 
 

December 31, 2019
 
 

 
 

 
 

 
 

 
 

HG Global/BAM
 
$
13.6

 
$
—

 
$
2.7

 
$
16.3

 
16.6
%
Other Operations
 
—

 
—

 
—

 
—

 
—

December 31, 2018
 
 

 
 

 
 

 
 

 
 

HG Global/BAM
 
13.6

 
—

 
.3

 
13.9

 
2.2

Other Operations
 
—

 
—

 
—

 
—

 
—

December 31, 2017
 
 

 
 

 
 

 
 
 
 

HG Global/BAM
 
9.4

 
—

 
—

 
9.4

 
—

Other Operations (2)
 
1.0

 
—

 
—

 
1.0

 
—

(1) 
Schedule excludes activity related to OneBeacon and Sirius Group for the year ended December 31, 2017. See Note 20 — “Held for Sale and Discontinued Operations”.
(2) 
The Other Operations amounts shown relate to SSIE. White Mountains completed the sale of SSIE on March 7, 2017. See Note 20 — “Held for Sale and Discontinued Operations”.































Schedules of the Registrant should be read in conjunction with the Consolidated Financial Statements and Notes.