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Loss and Loss Adjustment Expense Reserves (Tables) | 6 Months Ended
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Jun. 30, 2014
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’s insurance and reinsurance subsidiaries for the three and six months ended June 30, 2014 and 2013:
|  | Three Months Ended |  | Six Months Ended
|  | June 30, |  | June 30,
Millions |  | 2014 |  | 2013 |  | 2014 |  | 2013
Gross beginning balance |  | $ | 3,048.4 |  |  | $ | 3,100.6 |  |  | $ | 3,079.3 |  |  | $ | 3,168.9 |
Less beginning reinsurance recoverable on unpaid losses |  | (425.2 | ) |  | (410.8 | ) |  | (428.1 | ) |  | (429.1 | )
Net loss and LAE reserves |  | 2,623.2 |  |  | 2,689.8 |  |  | 2,651.2 |  |  | 2,739.8 |
Loss and LAE reserves acquired (1) |  | — |  |  | — |  |  | — |  |  | 21.3 |
Loss and LAE reserves consolidated — SSIE |  | — |  |  | — |  |  | 13.6 |  |  | — |
Loss and LAE incurred relating to: |  |  |  |  |  |  |  |  |  |
Current year losses |  | 278.4 |  |  | 290.0 |  |  | 518.9 |  |  | 532.9 |
Prior year losses |  | 4.3 |  |  | (15.4 | ) |  | (6.9 | ) |  | (14.0 | )
Total incurred losses and LAE |  | 282.7 |  |  | 274.6 |  |  | 512.0 |  |  | 518.9 |
Accretion of fair value adjustment to loss and LAE reserves |  | .2 |  |  | .1 |  |  | .4 |  |  | 1.3 |
Foreign currency translation adjustment to loss and LAE reserves |  | (.5 | ) |  | (4.6 | ) |  | 1.3 |  |  | (14.2 | )
Loss and LAE paid relating to: |  |  |  |  |  |  |  |  |  |
Current year losses |  | (65.8 | ) |  | (83.3 | ) |  | (100.8 | ) |  | (119.9 | )
Prior year losses |  | (219.7 | ) |  | (207.3 | ) |  | (457.6 | ) |  | (477.9 | )
Total loss and LAE payments |  | (285.5 | ) |  | (290.6 | ) |  | (558.4 | ) |  | (597.8 | )
Net ending balance |  | 2,620.1 |  |  | 2,669.3 |  |  | 2,620.1 |  |  | 2,669.3 |
Plus ending reinsurance recoverable on unpaid losses |  | 433.2 |  |  | 388.6 |  |  | 433.2 |  |  | 388.6 |
Gross ending balance |  | $ | 3,053.3 |  |  | $ | 3,057.9 |  |  | $ | 3,053.3 |  |  | $ | 3,057.9 |
(1) Loss and LAE reserves acquired relate to WM Solutions purchase of Ashmere in the first quarter of 2013.

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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 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
Name: | us-gaap_ScheduleOfLiabilityForUnpaidClaimsAndClaimsAdjustmentExpense
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Period Type: | duration