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Loss and Loss Adjustment Expense Reserves | 3 Months Ended
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Mar. 31, 2017
Insurance Loss Reserves [Abstract] |
Loss and Loss Adjustment Expense Reserves | Loss and Loss Adjustment Expense Reserves 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”. Loss and LAE incurred relating to prior year losses for the three months ended March 31, 2017 For the three months ended March 31, 2017, White Mountains did not experience any net loss reserve development on prior accident year reserves, as unfavorable reserve development at OneBeacon, primarily in Healthcare due to an adverse settlement on a single claim was offset by favorable reserve development driven by Technology, Accident & Health and Entertainment resulting from favorable loss experience. Loss and LAE incurred relating to prior year losses for the three months ended March 31, 2016 For the three months ended March 31, 2016, White Mountains experienced net favorable loss reserve development of $0.1 million. For the three months ended March 31, 2016, OneBeacon did not experience any net loss reserve development on prior accident year reserves, as favorable development from several businesses, including Technology and Accident, was offset by unfavorable development primarily in Healthcare. For the three months ended March 31, 2016, SSIE had net favorable loss reserve development of $0.1 million.

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- Definition The entire disclosure for liabilities related to future policy benefits and unpaid claims and claim adjustments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6482852&loc=d3e14931-158439 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=65670824&loc=d3e14754-158437 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.13(a)(1),(b)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 4: 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
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