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Third Party Reinsurance (Tables)
 6 Months Ended
Jun. 30, 2013
Reinsurance Disclosures [Abstract]  
Schedule of One Beacon Top Reinsurers [Table Text Block]
The following table provides a listing of OneBeacon's top reinsurers, excluding industry pools and associations, based upon recoverable amounts, the percentage of total recoverables and the reinsurers’ A.M. Best Rating. The reinsurance balances associated with the runoff business are included in discontinued operations (see Note 15).
Top Reinsurers (Millions)
 
Balance at June 30, 2013
 
% of Total
 
A.M. Best
Rating(1)
 
Hannover Ruckversich
 
$10.2
 
9%
 
A+
 
Munich Reinsurance America
 
6.7
 
6%
 
A+
 
Platinum Underwriters
 
5.4
 
5%
 
A
 
Swiss Reinsurance America Corp
 
5.0
 
4%
 
A+
 
Hartford Steam Boiler
 
4.9
 
4%
 
A++
 
(1)  A.M. Best ratings as detailed above are: “A++” (Superior, which is the highest of sixteen financial strength ratings), “A+” (Superior, which is the second highest of sixteen financial strength ratings) and “A” (Excellent, which is the third highest of sixteen financial strength ratings).
Listing of Sirius's top reinsurers
The following table provides a listing of Sirius Group’s top reinsurers based upon recoverable amounts, the percentage of total recoverables and the reinsurers’ A.M. Best Rating.
Top Reinsurers (Millions)
 
Balance at June 30, 2013
 
% of Total
 
A.M. Best
Rating(1)
 
% Collateralized
Berkshire Hathaway
 
$56.3
 
18%
 
A++
 
—
%
Swiss Re Group
 
34.0
 
11%
 
A+
 
—
%
Olympus Reinsurance Company(2)
 
25.0
 
8%
 
NR-5
 
100
%
Lloyds of London(3)
 
16.1
 
5%
 
A
 
16
%
International Medical Insurance Co. Ltd.
 
12.2
 
4%
 
NR-5
 
31
%
(1)  A.M. Best ratings as detailed above are: “A++” (Superior, which is the highest of sixteen financial strength ratings), “A+” (Superior, which is the second highest of sixteen financial strength ratings), “A” (Excellent, which is the third highest of sixteen financial strength ratings) and “NR-5” (Not formally followed).
(2) Non-U.S. insurance entity. The balance is fully collateralized through trust agreements or funds held.
(3) Represents the total of reinsurance recoverables due to Sirius Group from all Lloyds Syndicates.