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SCHEDULE IV REINSURANCE
 12 Months Ended
Dec. 31, 2014
Supplemental Schedule of Reinsurance Premiums for Insurance Companies [Abstract]  
SCHEDULE IV REINSURANCE
WHITE MOUNTAINS INSURANCE GROUP, LTD.
REINSURANCE
(Millions)

Column A
 
Column B
 
Column C
 
Column D
 
Column E
 
Column F
Premiums earned
 
Gross amount
 
Ceded to other
companies
 
Assumed from
other companies
 
Net amount
 
Percentage of
amount assumed
to net
Years ended:
 
 

 
 

 
 

 
 

 
 

December 31, 2014
 
 

 
 

 
 

 
 

 
 

OneBeacon (1)
 
$
1,209.1

 
$
(102.9
)
 
$
70.9

 
$
1,177.1

 
6.0
%
Sirius Group
 
200.2

 
(251.7
)
 
925.4

 
873.9

 
105.9
%
HG/BAM
 
1.8

 
—

 
—

 
1.8

 
—
%
Other operations(2)
 
22.6

 
(16.5
)
 
—

 
6.1

 
—

December 31, 2013
 
 

 
 

 
 

 
 

 
 

OneBeacon(1)
 
$
1,043.3

 
$
(71.4
)
 
$
148.5

 
$
1,120.4

 
13.3
%
Sirius Group
 
174.0

 
(246.2
)
 
938.6

 
866.4

 
108.3
%
December 31, 2012
 
 

 
 

 
 

 
 

 
 

OneBeacon(1)
 
$
1,158.3

 
$
(79.1
)
 
$
52.8

 
$
1,132.0

 
4.7
%
Sirius Group
 
169.9

 
(226.6
)
 
988.3

 
931.6

 
106.1
%
(1)
The amounts shown excludes balances reclassified to discontinued operations in the consolidated income statement related to the Runoff Transaction as of December 31, 2014, 2013 and 2012. See Note 22 - “Discontinued Operations”.
(2) 
The Other operations amounts shown relate to SSIE. SSIE’s results are attributed to non-controlling interests.




























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