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Loss and Loss Adjustment Expense Reserves (Tables) | 9 Months Ended
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Sep. 30, 2012
Insurance Loss Reserves [Abstract] |
Loss and loss adjustment expense ("LAE") reserve activities | The following table summarizes the loss and loss adjustment expense (“LAE”) reserve activities of White Mountains’ insurance and reinsurance subsidiaries for the three and nine months ended September 30, 2012 and 2011:
|  | Three Months Ended |  | Nine Months Ended
|  | September 30, |  | September 30,
Millions |  | 2012 |  | 2011 |  | 2012 |  | 2011
Gross beginning balance |  | $ | 5,329.8 |  |  | $ | 5,642.4 |  |  | $ | 5,702.3 |  |  | $ | 5,736.8 |
Less beginning reinsurance recoverable on unpaid losses |  | (2,369.4 | ) |  | (2,193.0 | ) |  | (2,507.3 | ) |  | (2,344.0 | )
Net loss and LAE reserves |  | 2,960.4 |  |  | 3,449.4 |  |  | 3,195.0 |  |  | 3,392.8 |
Less: Beginning net loss and LAE reserves for AutoOne and OneBeacon's runoff business (1) |  | (296.0 | ) |  | (503.2 | ) |  | (384.1 | ) |  | (620.6 | )
Loss and LAE incurred relating to: |  |  |  |  |  |  |  |  |  |  |  |
Current year losses |  | 318.2 |  |  | 307.1 |  |  | 842.9 |  |  | 968.0 |
Prior year losses |  | (10.1 | ) |  | (26.9 | ) |  | (21.2 | ) |  | (47.6 | )
Total incurred losses and LAE |  | 308.1 |  |  | 280.2 |  |  | 821.7 |  |  | 920.4 |
Accretion of fair value adjustment to loss and LAE reserves |  | 1.1 |  |  | 2.1 |  |  | 9.4 |  |  | 6.2 |
Foreign currency translation adjustment to loss and LAE reserves |  | 12.0 |  |  | (25.5 | ) |  | 11.7 |  |  | 5.7 |
Loss and LAE paid relating to: |  |  |  |  |  |  |  |  |  |  |  |
Current year losses |  | (101.1 | ) |  | (109.7 | ) |  | (223.9 | ) |  | (226.3 | )
Prior year losses |  | (181.5 | ) |  | (186.9 | ) |  | (726.8 | ) |  | (571.8 | )
Total loss and LAE payments |  | (282.6 | ) |  | (296.6 | ) |  | (950.7 | ) |  | (798.1 | )
Plus: Ending net loss and LAE reserves for AutoOne and OneBeacon's runoff business (1) |  | — |  |  | 394.4 |  |  | — |  |  | 394.4 |
Net ending balance |  | 2,703.0 |  |  | 3,300.8 |  |  | 2,703.0 |  |  | 3,300.8 |
Plus ending reinsurance recoverable on unpaid losses |  | 356.8 |  |  | 2,581.2 |  |  | 356.8 |  |  | 2,581.2 |
Gross ending balance |  | $ | 3,059.8 |  |  | $ | 5,882.0 |  |  | $ | 3,059.8 |  |  | $ | 5,882.0 |
(1) Loss and LAE reserve balances for OneBeacon's run-off business prior to September 30, 2012 and AutoOne prior to September 30, 2011 were not classified as held for sale. Adjustment is to present loss and LAE reserve activities from continuing operations.

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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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