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SCHEDULE V VALUATION AND QUALIFYING ACCOUNTS | 12 Months Ended
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Dec. 31, 2012
Valuation and Qualifying Accounts [Abstract] |
SCHEDULE V VALUATION AND QUALIFYING ACCOUNTS | WHITE MOUNTAINS INSURANCE GROUP, LTD. VALUATION AND QUALIFYING ACCOUNTS
Column A |  | Column B |  | Column C |  | Column D |  | Column E
|  |  |  | Additions (subtractions) |  |  |  |
Millions |  | Balance at beginning of period |  | Charged to costs and expenses |  | Charged to other accounts |  | Deductions described (1) |  | Balance at end of period
Years ended: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
December 31, 2012 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reinsurance recoverable on paid losses: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for reinsurance balances |  | $ | 34.4 |  |  | $ | (.6 | ) |  | $ | — |  |  | $ | 1.7 |  |  | $ | 35.5 |
Property and casualty insurance and reinsurance premiums receivable: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for uncollectible accounts |  | 3.4 |  |  | 1.1 |  |  | — |  |  | (.1 | ) |  | 4.4 |
December 31, 2011 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reinsurance recoverable on paid losses: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for reinsurance balances |  | $ | 29.4 |  |  | $ | 8.5 |  |  | $ | — |  |  | $ | (3.5 | ) |  | $ | 34.4 |
Property and casualty insurance and reinsurance premiums receivable: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for uncollectible accounts |  | 3.9 |  |  | — |  |  | (.5 | ) |  | — |  |  | 3.4 |
December 31, 2010 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reinsurance recoverable on paid losses: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for reinsurance balances |  | $ | 30.0 |  |  | $ | (.4 | ) |  | $ | — |  |  | $ | (.2 | ) |  | $ | 29.4 |
Property and casualty insurance and reinsurance premiums receivable: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for uncollectible accounts |  | 6.3 |  |  | .2 |  |  | (1.0 | ) |  | (1.6 | ) |  | 3.9 |
(1) | Represents net collections (charge-offs) of balances receivables and foreign currency translation.

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- Definition The entire disclosure for any allowance and reserve accounts (their beginning and ending balances, as well as a reconciliation by type of activity during the period). Alternatively, disclosure of the required information may be within the footnotes to the financial statements or a supplemental schedule to the financial statements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 09 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e24092-122690 + Details
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- Details
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