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SCHEDULE IV REINSURANCE
 12 Months Ended
Dec. 31, 2017
Supplemental Schedule of Reinsurance Premiums for Insurance Companies [Abstract]  
SCHEDULE IV REINSURANCE
WHITE MOUNTAINS INSURANCE GROUP, LTD.
REINSURANCE (2) 

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
Years ended:
 
 

 
 

 
 

 
 

 
 

December 31, 2017
 
 

 
 

 
 

 
 

 
 

HG Global/BAM
 
$
9.4

 
$
—

 
$
—

 
$
9.4

 
—
%
Other operations (1)
 
1.0

 
—

 
—

 
1.0

 
—

December 31, 2016
 
 

 
 

 
 

 
 

 
 

HG Global/BAM
 
5.9

 
—

 
—

 
5.9

 
—
%
Other operations (1)
 
15.2

 
(7.7
)
 
—

 
7.5

 
—

December 31, 2015
 
 

 
 

 
 

 
 
 
 

HG Global/BAM
 
3.3

 
—

 
—

 
3.3

 
—
%
Other operations (1)
 
20.7

 
(12.0
)
 
$
—

 
8.7

 
—
%
(1) 
The Other operations amounts shown relate to SSIE. White Mountains completed the sale of SSIE on March 7, 2017. See Note 19 — “Held for Sale and Discontinued Operations”.
(2) 
Schedule excludes activity related to OneBeacon and Sirius Group for all periods presented. See Note 19 — “Held for Sale and Discontinued Operations”.
































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