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SCHEDULE III SUPPLEMENTARY INSURANCE INFORMATION | 12 Months Ended
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Dec. 31, 2012
Supplementary Insurance Information [Abstract] |
SCHEDULE III SUPPLEMENTARY INSURANCE INFORMATION | WHITE MOUNTAINS INSURANCE GROUP, LTD. SUPPLEMENTARY INSURANCE INFORMATION (Millions)
Column A |  | Column B |  | Column C |  | Column D |  | Column E |  | Column F |  | Column G |  | Column H |  | Column I |  | Column J |  | Column K
Segment |  | Deferred acquisition costs |  | Future policy benefits, losses, claims and loss expenses |  | Unearned premiums |  | Other policy claims and benefits payable |  | Premiums earned |  | Net investment income (1) |  | Benefits, claims, losses, and settlement expenses |  | Amortization of deferred policy acquisition costs |  | Other operating expenses |  | Premiums written
Years ended: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
December 31, 2012: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
OneBeacon |  | $ | 123.9 |  |  | $ | 1,000.0 |  |  | $ | 573.8 |  |  | $ | — |  |  | $ | 1,132.0 |  |  | $ | 53.6 |  |  | $ | 650.0 |  |  | $ | 249.4 |  |  | $ | 205.2 |  |  | $ | 1,179.2 |
Sirius Group |  | 71.4 |  |  | 2,168.9 |  |  | 350.2 |  |  | — |  |  | 931.6 |  |  | 65.0 |  |  | 543.9 |  |  | 180.8 |  |  | 116.4 |  |  | 947.7 |
HG Global/BAM |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 2.2 |  |  | — |  |  | — |  |  | .2 |  |  | — |
Other operations |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 0.5 |  |  | — |  |  | — |  |  | — |  |  | — |
December 31, 2011: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
OneBeacon |  | $ | 123.5 |  |  | $ | 3,358.6 |  |  | $ | 528.0 |  |  | $ | — |  |  | $ | 1,012.2 |  |  | $ | 71.4 |  |  | $ | 548.3 |  |  | $ | 221.2 |  |  | $ | 162.3 |  |  | $ | 1,062.7 |
Sirius Group |  | 63.5 |  |  | 2,343.7 |  |  | 319.0 |  |  | — |  |  | 912.3 |  |  | 89.9 |  |  | 626.0 |  |  | 181.0 |  |  | 105.8 |  |  | 915.7 |
Other operations |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (0.1 | ) |  | — |  |  | — |  |  | — |  |  | — |
December 31, 2010: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
OneBeacon |  | $ | 114.5 |  |  | $ | 3,295.5 |  |  | $ | 627.5 |  |  | $ | — |  |  | $ | 1,181.1 |  |  | $ | 96.6 |  |  | $ | 685.6 |  |  | $ | 252.1 |  |  | $ | 196.1 |  |  | $ | 1,167.7 |
Sirius Group |  | 61.6 |  |  | 2,441.3 |  |  | 311.2 |  |  | — |  |  | 847.9 |  |  | 90.5 |  |  | 531.0 |  |  | 167.5 |  |  | 99.8 |  |  | 865.8 |
Other operations |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (0.1 | ) |  | — |  |  | — |  |  | — |  |  | — |
(1) | The amounts shown exclude net investment income relating to non-insurance operations in the other operations segment of $32.3, $23.3 and $21.9 for the twelve months ended December 31, 2012, 2011 and 2010, respectively.

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- Definition The entire disclosure for required supplementary insurance information giving segment detail in support of various balance sheet and income statement captions. The balance sheet information generally is presented as of the date of each audited balance sheet filed, and the income statement information generally is presented for each period for which an audited income statement is required to be filed. Supplementary insurance information table includes segment name; deferred policy acquisition costs; future policy benefits, losses, claims and loss expenses; unearned premiums; other policy claims and benefits payable; premium revenue; net investment income; benefits, claims, losses and settlement expenses; amortization of deferred policy acquisition costs; other operating expenses; and premiums written. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 10 -Section S99 -Paragraph 3 -Subparagraph (SX 210.7-05.(c) Schedule III) -URI http://asc.fasb.org/extlink&oid=6879921&loc=d3e569147-122900 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 16 -Article 12 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 05 -Paragraph c -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-16) -URI http://asc.fasb.org/extlink&oid=6588446&loc=d3e574960-122915 + Details
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