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Third Party Reinsurance (Tables) | 12 Months Ended
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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).

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- Definition Tabular disclosure of reinsurer or group of reinsurers for whom the entity has a concentration of credit risk. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13537-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 825 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=28088331&loc=SL29635902-196195 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13531-108611 + Details
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