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Loss and Loss Adjustment Expense Reserves (Tables) | 3 Months Ended
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Mar. 31, 2017
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 months ended March 31, 2017 and 2016:
|  | Three Months Ended
|  | March 31,
Millions |  | 2017 |  | 2016
Gross beginning balance |  | $ | 1,365.6 |  |  | $ | 1,389.8 |
Less beginning reinsurance recoverable on unpaid losses |  | (172.9 | ) |  | (186.0 | )
Net loss and LAE reserves |  | 1,192.7 |  |  | 1,203.8 |
Add: SSIE reserves held for sale at beginning of the period (1) |  | 4.7 |  |  | 5.5 |
Loss and LAE incurred relating to: |  |  |  |
Current year losses |  | 151.7 |  |  | 161.2 |
Prior year losses |  | — |  |  | (.1 | )
Total incurred losses and LAE |  | 151.7 |  |  | 161.1 |
Loss and LAE paid relating to: |  |  |  |
Current year losses |  | (21.5 | ) |  | (23.1 | )
Prior year losses |  | (129.1 | ) |  | (148.6 | )
Total loss and LAE payments |  | (150.6 | ) |  | (171.7 | )
Less: Deconsolidation of SSIE (1) |  | 4.4 |  |  | — |
Less: SSIE reserves held for sale at end of the period (1) |  | — |  |  | 5.3 |
Net ending balance |  | 1,194.1 |  |  | 1,193.4 |
Plus ending reinsurance recoverable on unpaid losses |  | 174.7 |  |  | 150.4 |
Gross ending balance |  | $ | 1,368.8 |  |  | $ | 1,343.8 |
(1) Resulting from the sale of Star & Shield in the first quarter of 2017, SSIE is no longer consolidated. See Note 17 — “Held for Sale and Discontinued 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 FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=65670824&loc=d3e14764-158437 + Details
Name: | us-gaap_ScheduleOfLiabilityForUnpaidClaimsAndClaimsAdjustmentExpense
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