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Reserves for Unpaid Losses and Loss Adjustment Expenses (Tables) | 12 Months Ended
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Dec. 31, 2012
Insurance Loss Reserves [Abstract] |
Loss and LAE reserve activities | The following table summarizes the loss and LAE reserve activities of White Mountains’ insurance and reinsurance subsidiaries for the years ended December 31, 2012, 2011 and 2010:
|  | Year Ended December 31,
Millions |  | 2012 |  | 2011 |  | 2010
Gross beginning balance |  | $ | 5,702.3 |  |  | $ | 5,736.8 |  |  | $ | 6,379.2 |
Less beginning reinsurance recoverable on unpaid losses |  | (2,507.3 | ) |  | (2,344.0 | ) |  | (2,771.5 | )
Net loss and LAE reserves |  | 3,195.0 |  |  | 3,392.8 |  |  | 3,607.7 |
Less: Beginning net loss and LAE reserves for AutoOne and the Runoff Transaction (1) |  | (383.3 | ) |  | (619.6 | ) |  | (759.0 | )
Loss and LAE reserves acquired (2) |  | 17.0 |  |  | 21.0 |  |  | 17.6 |
Loss and LAE reserves sold—OneBeacon Personal Lines |  | — |  |  | — |  |  | (231.0 | )
Losses and LAE incurred relating to: |  |  |  |  |  |
Current year losses |  | 1,235.8 |  |  | 1,251.0 |  |  | 1,309.7 |
Prior year losses |  | (41.9 | ) |  | (76.7 | ) |  | (93.1 | )
Total incurred losses and LAE |  | 1,193.9 |  |  | 1,174.3 |  |  | 1,216.6 |
Accretion of fair value adjustment to net loss and LAE reserves |  | 10.6 |  |  | 8.3 |  |  | 8.5 |
Foreign currency translation adjustment to net loss and LAE reserves |  | 12.9 |  |  | .1 |  |  | 4.7 |
Loss and LAE paid relating to: |  |  |  |  |  |
Current year losses |  | (404.7 | ) |  | (387.9 | ) |  | (445.9 | )
Prior year losses |  | (901.6 | ) |  | (777.3 | ) |  | (646.0 | )
Total loss and LAE payments |  | (1,306.3 | ) |  | (1,165.2 | ) |  | (1,091.9 | )
Plus: Ending net loss and LAE reserves for AutoOne and the Runoff Transaction (1) |  | — |  |  | 383.3 |  |  | 619.6 |
Net ending balance |  | 2,739.8 |  |  | 3,195.0 |  |  | 3,392.8 |
Plus ending reinsurance recoverable on unpaid losses |  | 429.1 |  |  | 2,507.3 |  |  | 2,344.0 |
Gross ending balance |  | $ | 3,168.9 |  |  | $ | 5,702.3 |  |  | $ | 5,736.8 |
(1) | Loss and LAE reserve balances from OneBeacon’s runoff business prior to December 31, 2012 and AutoOne prior to December 31, 2011 were not classified as held for sale. Adjustment is to present loss and LAE reserve activities for continuing operations.
(2) | Loss and LAE reserves acquired relate to WM Solutions purchases of PICO, Citation, American General and American General Property in 2012, Old Lyme in 2011 and Central National in 2010.
Schedule of asbestos and environmental loss and LAE reserve activities | Sirius Group
Net A&E Loss Reserve Activity |  | Year Ended December 31,
|  | 2012 |  | 2011 |  | 2010
Millions |  | Gross |  | Net |  | Gross |  | Net |  | Gross |  | Net
Asbestos: |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  | $ | 185.1 |  |  | $ | 146.2 |  |  | $ | 191.9 |  |  | $ | 151.5 |  |  | $ | 187.0 |  |  | $ | 146.6 |
Losses and LAE acquired |  | 11.0 |  |  | 11.0 |  |  | — |  |  | — |  |  | 10.4 |  |  | 9.7 |
Incurred losses and LAE |  | 46.8 |  |  | 46.4 |  |  | 13.6 |  |  | 10.3 |  |  | 9.0 |  |  | 7.3 |
Paid losses and LAE |  | (34.7 | ) |  | (29.4 | ) |  | (20.4 | ) |  | (15.6 | ) |  | (14.5 | ) |  | (12.1 | )
Ending balance |  | 208.2 |  |  | 174.2 |  |  | 185.1 |  |  | 146.2 |  |  | 191.9 |  |  | 151.5 |
Environmental: |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  | 22.1 |  |  | 16.5 |  |  | 22.4 |  |  | 18.1 |  |  | 22.2 |  |  | 17.9 |
Losses and LAE acquired |  | 0.7 |  |  | 0.7 |  |  | — |  |  | — |  |  | 3.5 |  |  | 2.4 |
Incurred losses and LAE |  | (0.1 | ) |  | (0.5 | ) |  | 2.9 |  |  | 2.0 |  |  | (2.5 | ) |  | (1.3 | )
Paid losses and LAE |  | (2.3 | ) |  | (1.5 | ) |  | (3.2 | ) |  | (3.6 | ) |  | (.8 | ) |  | (.9 | )
Ending balance |  | 20.4 |  |  | 15.2 |  |  | 22.1 |  |  | 16.5 |  |  | 22.4 |  |  | 18.1 |
Total asbestos and environmental: |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  | 207.2 |  |  | 162.7 |  |  | 214.3 |  |  | 169.6 |  |  | 209.2 |  |  | 164.5 |
Losses and LAE acquired |  | 11.7 |  |  | 11.7 |  |  | — |  |  | — |  |  | 13.9 |  |  | 12.1 |
Incurred losses and LAE |  | 46.7 |  |  | 45.9 |  |  | 16.5 |  |  | 12.3 |  |  | 6.5 |  |  | 6.0 |
Paid losses and LAE |  | (37.0 | ) |  | (30.9 | ) |  | (23.6 | ) |  | (19.2 | ) |  | (15.3 | ) |  | (13.0 | )
Ending balance |  | $ | 228.6 |  |  | $ | 189.4 |  |  | $ | 207.2 |  |  | $ | 162.7 |  |  | $ | 214.3 |  |  | $ | 169.6 |
The following tables summarize reported A&E loss and LAE reserve activities (gross and net of reinsurance) for OneBeacon for the years ended December 31, 2012, 2011 and 2010, respectively.
Net A&E Loss |  | Year Ended December 31,
Reserve Activity |  | 2012 |  | 2011 |  | 2010
|  |  |  | Pre-NICO |  |  |  |  |  | Pre-NICO |  |  |  |  |  | Pre-NICO |  |
Millions |  | Gross |  | Net (1) |  | Net (2) |  | Gross |  | Net (1) |  | Net (2) |  | Gross |  | Net (1) |  | Net (2)
Asbestos: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  | $ | 1,074.3 |  |  | $ | 681.2 |  |  | $ | 2.2 |  |  | $ | 904.0 |  |  | $ | 647.3 |  |  | $ | 6.4 |  |  | $ | 985.6 |  |  | $ | 688.8 |  |  | $ | 6.5 |
Incurred losses and LAE |  | (.3 | ) |  | (.5 | ) |  | (.5 | ) |  | 256.8 |  |  | 32.2 |  |  | (4.0 | ) |  | — |  |  | — |  |  | — |
Paid losses and LAE |  | (144.6 | ) |  | (78.2 | ) |  | .7 |  |  | (86.5 | ) |  | 1.7 |  |  | (.2 | ) |  | (81.6 | ) |  | (41.5 | ) |  | (.1 | )
Ending balance |  | 929.4 |  |  | 602.5 |  |  | 2.4 |  |  | 1,074.3 |  |  | 681.2 |  |  | 2.2 |  |  | 904.0 |  |  | 647.3 |  |  | 6.4 |
Environmental: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  | 279.8 |  |  | 151.6 |  |  | 9.0 |  |  | 119.0 |  |  | 93.8 |  |  | 9.2 |  |  | 350.7 |  |  | 218.6 |  |  | 7.6 |
Incurred losses and LAE |  | (.9 | ) |  | (.5 | ) |  | (.5 | ) |  | 231.8 |  |  | 62.2 |  |  | 10.0 |  |  | 6.2 |  |  | 6.0 |  |  | 6.0 |
Paid losses and LAE |  | (45.9 | ) |  | (25.7 | ) |  | (2.1 | ) |  | (71.0 | ) |  | (4.4 | ) |  | (10.2 | ) |  | (237.9 | ) |  | (130.8 | ) |  | (4.4 | )
Ending balance |  | 233.0 |  |  | 125.4 |  |  | 6.4 |  |  | 279.8 |  |  | 151.6 |  |  | 9.0 |  |  | 119.0 |  |  | 93.8 |  |  | 9.2 |
Total asbestos and environmental: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  | 1,354.1 |  |  | 832.8 |  |  | 11.2 |  |  | 1,023.0 |  |  | 741.1 |  |  | 15.6 |  |  | 1,336.3 |  |  | 907.4 |  |  | 14.1 |
Incurred losses and LAE |  | (1.2 | ) |  | (1.0 | ) |  | (1.0 | ) |  | 488.6 |  |  | 94.4 |  |  | 6.0 |  |  | 6.2 |  |  | 6.0 |  |  | 6.0 |
Paid losses and LAE |  | (190.5 | ) |  | (103.9 | ) |  | (1.4 | ) |  | (157.5 | ) |  | (2.7 | ) |  | (10.4 | ) |  | (319.5 | ) |  | (172.3 | ) |  | (4.5 | )
Ending balance |  | $ | 1,162.4 |  |  | $ | 727.9 |  |  | $ | 8.8 |  |  | $ | 1,354.1 |  |  | $ | 832.8 |  |  | $ | 11.2 |  |  | $ | 1,023.0 |  |  | $ | 741.1 |  |  | $ | 15.6 |
(1) Represents A&E reserve activity, net of third-party reinsurance, but prior to the NICO Cover. (2) Includes NICO cover

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- Definition Tabular disclosure of the activity in the reserve for settling insured claims and expenses incurred in the claims settlement process for the period. The estimated liability includes the amount of money that will be required for future payments of (a) claims that have been reported to the insurer, (b) claims related to insured events that have occurred but that have not been reported to the insurer as of the date the liability is estimated, and (c) claim adjustment expenses. Claim adjustment expenses include costs incurred in the claim settlement process such as legal fees; outside adjuster fees; and costs to record, process, and adjust claims. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 94-5 -Paragraph 11 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6482485&loc=d3e14764-158437 + Details
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- Definition Tabular disclosure of asbestos and environmental loss and LAE reserve activities including beginning balance, incurred losses and LAE, paid losses and LAE and ending balance. + References No definition available. + Details
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