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SCHEDULE IV REINSURANCE
 12 Months Ended
Dec. 31, 2016
Supplemental Schedule of Reinsurance Premiums for Insurance Companies [Abstract]  
SCHEDULE IV REINSURANCE
WHITE MOUNTAINS INSURANCE GROUP, LTD.
REINSURANCE (3) 
(Millions)

Column A
 
Column B
 
Column C
 
Column D
 
Column E
 
Column F
Premiums earned

$ in millions
 
Gross amount
 
Ceded to other
companies
 
Assumed from
other companies
 
Net amount
 
Percentage of
amount assumed
to net
Years ended:
 
 

 
 

 
 

 
 

 
 

December 31, 2016
 
 

 
 

 
 

 
 

 
 

OneBeacon
 
$
1,177.0

 
$
(105.8
)
 
$
29.4

 
$
1,100.6

 
2.7
%
HG/BAM
 
5.9

 
—

 
—

 
5.9

 
—
%
Other operations (2)
 
15.2

 
(7.7
)
 
—

 
7.5

 
—

December 31, 2015
 
 

 
 

 
 

 
 

 
 

OneBeacon (1)
 
$
1,298.0

 
$
(167.7
)
 
$
45.9

 
$
1,176.2

 
3.9
%
HG/BAM
 
3.3

 
—

 
—

 
3.3

 
—
%
Other operations (2)
 
20.7

 
(12.0
)
 
—

 
8.7

 
—

December 31, 2014
 
 

 
 

 
 

 
 
 
 

OneBeacon (1)
 
$
1,209.1

 
$
(102.9
)
 
$
70.9

 
$
1,177.1

 
6.0
%
HG/BAM
 
1.8

 
—

 
—

 
1.8

 
—
%
Other operations (2)
 
$
22.6

 
$
(16.5
)
 
$
—

 
$
6.1

 
—
%
(1)
The amounts shown excludes balances reclassified to discontinued operations in the consolidated income statement related to the Runoff Transaction as of December 31, 2015 and 2014. See Note 22 — “Held for Sale and Discontinued Operations”.
(2) 
The Other operations amounts shown relate to SSIE. SSIE’s results are attributed to non-controlling interests.
(3) 
Schedule excludes activity related to Sirius Group for all periods presented. See Note 22 — “Held for Sale and Discontinued Operations”.




























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