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Third Party Reinsurance (Tables)
 12 Months Ended
Dec. 31, 2013
Ceded Credit Risk [Line Items]  
Schedule of direct assumed and ceded amounts
The effects of reinsurance on White Mountains’ insurance and reinsurance subsidiaries’ written and earned premiums and on losses and LAE were as follows (see Note 9 for balances related to White Mountains financial guarantee business):
 
 
Year Ended December 31, 2013
Millions
 
OneBeacon
 
Sirius Group
 
Total
Written premiums:
 
 
 
 
 
 
Direct
 
$
1,103.1

 
$
177.3

 
$
1,280.4

Assumed
 
59.8

 
943.1

 
1,002.9

Gross written premiums
 
1,162.9

 
1,120.4

 
2,283.3

Ceded
 
(74.3
)
 
(243.8
)
 
(318.1
)
Net written premiums
 
$
1,088.6

 
$
876.6

 
$
1,965.2

Earned premiums:
 
 
 
 
 
 
Direct
 
$
1,043.3

 
$
174.0

 
$
1,217.3

Assumed
 
148.5

 
938.6

 
1,087.1

Gross earned premiums
 
1,191.8

 
1,112.6

 
2,304.4

Ceded
 
(71.4
)
 
(246.2
)
 
(317.6
)
Net earned premiums
 
$
1,120.4

 
$
866.4

 
$
1,986.8

Losses and LAE:
 
 
 
 
 
 
Direct
 
$
584.9

 
$
98.1

 
$
683.0

Assumed
 
76.3

 
455.5

 
531.8

Gross losses and LAE
 
661.2

 
553.6

 
1,214.8

Ceded
 
(39.1
)
 
(135.2
)
 
(174.3
)
Net losses and LAE
 
$
622.1

 
$
418.4

 
$
1,040.5


 
 
Year Ended December 31, 2012
Millions
 
OneBeacon
 
Sirius Group
 
Total
Written premiums:
 
 
 
 
 
 
Direct
 
$
1,204.0

 
$
186.1

 
$
1,390.1

Assumed
 
55.2

 
992.7

 
1,047.9

Gross written premiums
 
1,259.2

 
1,178.8

 
2,438.0

Ceded
 
(80.0
)
 
(231.1
)
 
(311.1
)
Net written premiums
 
$
1,179.2

 
$
947.7

 
$
2,126.9

Earned premiums:
 
 
 
 
 
 
Direct
 
$
1,158.3

 
$
169.9

 
$
1,328.2

Assumed
 
52.8

 
988.3

 
1,041.1

Gross earned premiums
 
1,211.1

 
1,158.2

 
2,369.3

Ceded
 
(79.1
)
 
(226.6
)
 
(305.7
)
Net earned premiums
 
$
1,132.0

 
$
931.6

 
$
2,063.6

Losses and LAE:
 
 
 
 
 
 
Direct
 
$
687.5

 
$
96.9

 
$
784.4

Assumed
 
29.6

 
523.9

 
553.5

Gross losses and LAE
 
717.1

 
620.8

 
1,337.9

Ceded
 
(67.1
)
 
(76.9
)
 
(144.0
)
Net losses and LAE
 
$
650.0

 
$
543.9

 
$
1,193.9


 
 
Year Ended December 31, 2011
Millions
 
OneBeacon
 
Sirius Group
 
Total
Written premiums:
 
 
 
 
 
 
Direct
 
$
1,079.2

 
$
139.5

 
$
1,218.7

Assumed
 
49.1

 
988.6

 
1,037.7

Gross written premiums
 
1,128.3

 
1,128.1

 
2,256.4

Ceded
 
(65.6
)
 
(212.4
)
 
(278.0
)
Net written premiums
 
$
1,062.7

 
$
915.7

 
$
1,978.4

Earned premiums:
 
 
 
 
 
 
Direct
 
$
1,035.9

 
$
128.5

 
$
1,164.4

Assumed
 
42.3

 
989.8

 
1,032.1

Gross earned premiums
 
1,078.2

 
1,118.3

 
2,196.5

Ceded
 
(66.0
)
 
(206.0
)
 
(272.0
)
Net earned premiums
 
$
1,012.2

 
$
912.3

 
$
1,924.5

Losses and LAE:
 
 
 
 
 
 
Direct
 
$
551.8

 
$
80.0

 
$
631.8

Assumed
 
9.2

 
627.8

 
637.0

Gross losses and LAE
 
561.0

 
707.8

 
1,268.8

Ceded
 
(12.7
)
 
(81.8
)
 
(94.5
)
Net losses and LAE
 
$
548.3

 
$
626.0

 
$
1,174.3
OneBeacon
  
Ceded Credit Risk [Line Items]  
Ceded Credit Risk
The reinsurance balances associated with the Runoff Business are included in discontinued operations (see Note 21).
Standard & Poor’s Rating(1)
 
Balance at December 31, 2013
 
% of Total
AA
 
$
26.4

 
30
%
A
 
56.1

 
62
%
BBB+, Not rated and other
 
7.4

 
8
%
Total
 
$
89.9

 
100
%
(1)  Standard & Poor’s ratings as detailed above are: “AA” (Very strong), “A” (Strong) and “BBB+” (Adequate).
Sirius Group
  
Ceded Credit Risk [Line Items]  
Ceded Credit Risk
The following table provides a listing of Sirius Group’s gross and net recoverable amounts by the reinsurer’s Standard & Poor’s rating and the percentage of total recoverables.
Rating(1)
 
Gross
 
Collateral
 
Net
 
% of Net Total
AAA
 
$
62.9

 
$
—

 
$
62.9

 
19
%
AA
 
60.6

 
4.5

 
56.1

 
17
%
A
 
127.5

 
1.6

 
125.9

 
39
%
BBB+
 
21.0

 
—

 
21.0

 
7
%
BBB or lower
 
16.6

 
—

 
16.6

 
5
%
Not rated
 
75.0

 
31.5

 
43.5

 
13
%
Total
 
$
363.6

 
$
37.6

 
$
326.0

 
100
%

(1) Standard & Poor’s ratings as detailed above are: “AAA” (Extremely strong), “AA” (Very strong), “A” (Strong), and “BBB+” and “BBB” (Adequate).