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SCHEDULE VI SUPPLEMENTAL INFORMATION FOR PROPERTY AND CASUALTY INSURANCE UNDERWRITERS | 12 Months Ended
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Dec. 31, 2011
SCHEDULE VI SUPPLEMENTAL INFORMATION FOR PROPERTY AND CASUALTY INSURANCE UNDERWRITERS |
SCHEDULE VI SUPPLEMENTAL INFORMATION FOR PROPERTY AND CASUALTY INSURANCE UNDERWRITERS |
SCHEDULE VI WHITE MOUNTAINS INSURANCE GROUP, LTD. SUPPLEMENTAL INFORMATION FOR PROPERTY AND CASUALTY INSURANCE UNDERWRITERS (Millions)
Column A |  | Column B |  | Column C |  | Column D |  | Column E |  | Column F |  | Column G |  | Column H |  | Column I |  | Column J |  | Column K |
|  | Deferred |  | Reserves for Unpaid Claims and Claims |  | Discount, if any, |  |  |  |  |  | Net |  | Claims and Claims Adjustment Expenses Incurred Related to |  | Amortization of deferred policy |  | Paid Claims and Claims |  |  |
Affiliation with registrant |  | acquisition costs |  | Adjustment Expenses |  | deducted in Column C |  | Unearned Premiums |  | Earned Premiums |  | investment income |  | (1) Current Year |  | (2) Prior Year |  | acquisition costs |  | Adjustment Expenses |  | Premiums written |
OneBeacon: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2011 |  | $ | 123.5 |  | $ | 3,358.6 |  | $ | 271.6 | (1) | $ | 528.0 |  | $ | 1,015.5 |  | $ | 71.4 |  | $ | 583.8 |  | $ | (2.9 | ) | $ | 219.0 |  | $ | 714.8 |  | $ | 1,062.9 |
2010 |  | 114.5 |  | 3,295.5 |  | 295.9 | (1) | 627.5 |  | 1,487.7 |  | 96.6 |  | 981.4 |  | (51.2 | ) | 320.7 |  | 1,038.8 |  | 1,236.3 |
2009 |  | 215.0 |  | 3,934.8 |  | 317.5 | (1) | 1,018.3 |  | 1,959.5 |  | 125.5 |  | 1,205.3 |  | (83.4 | ) | 398.3 |  | 1,176.1 |  | 1,906.7 |
Sirius Group: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2011 |  | $ | 63.5 |  | $ | 2,343.7 |  | $ | 12.8 | (2) | $ | 319.0 |  | $ | 912.3 |  | $ | 89.9 |  | $ | 672.9 |  | $ | (46.9 | ) | $ | 181.0 |  | $ | 642.0 |  | $ | 915.7 |
2010 |  | 61.6 |  | 2,441.3 |  | 21.1 | (2) | 311.2 |  | 847.9 |  | 90.5 |  | 588.1 |  | (57.1 | ) | 167.5 |  | 437.0 |  | 865.8 |
2009 |  | 57.2 |  | 2,444.4 |  | 29.5 | (2) | 287.5 |  | 858.8 |  | 107.7 |  | 449.1 |  | (30.4 | ) | 170.9 |  | 772.9 |  | 806.8 |
Other operations: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2011 |  | $ | — |  | $ | — |  | $ | — |  | $ | — |  | $ | — |  | $ | — |  | $ | — |  | $ | — |  | $ | — |  | $ | — |  | $ | — |
2010 |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |
2009 |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |
50%-or-less owned property and casualty investees:(3) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Delos(4): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2011 |  | $ | — |  | $ | — |  | $ | — |  | $ | — |  | $ | — |  | $ | — |  | $ | — |  | $ | — |  | $ | — |  | $ | — |  | $ | — |
2010 |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |
2009 |  | 3.9 |  | 73.3 |  | — |  | 26.1 |  | 33.3 |  | 1.7 |  | 24.3 |  | — |  | — |  | 18.2 |  | 31.7 |
(1) The amounts shown represent OneBeacon’s discount on its long-term workers compensation loss and LAE reserves, as such liabilities constitute unpaid but settled claims under which the payment pattern and ultimate costs are fixed and determinable on an individual basis. OneBeacon discounts these reserves using a discount rate which is determined based on the facts and circumstances applicable at the time the claims are settled (4.5%, 5.0% and 5.3% at December 31, 2011, 2010 and 2009). Also the amounts shown include unamortized fair value adjustments to reserves for unpaid claims and claims adjustment expenses made in purchase accounting as a result of White Mountains’ purchase of OneBeacon for the years ended December 31, 2011, 2010 and 2009. (2) The amount shown represents unamortized fair value adjustments to reserves for unpaid claims and claims adjustment expenses made in purchase accounting as a result of White Mountains’ purchase of Sirius International during 2004. (3) The amounts shown represent White Mountains’ share of its 50% owned unconsolidated property and casualty insurance affiliates. (4) In August 2006, White Mountains acquired an equity interest of approximately 18% in Delos. During the fourth quarter of 2010, White Mountains sold its entire interest in Delos.

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- Definition The entire disclosure for the supplemental schedule of information for an entity who has a consolidated property-casualty insurance underwriter, unconsolidated property-casualty subsidiary or fifty percent-or-less owned property-casualty equity investee. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 18 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-18) -URI http://asc.fasb.org/extlink&oid=6588446&loc=d3e575016-122915 + Details
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