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Loss and Loss Adjustment Expense Reserves | 3 Months Ended
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Mar. 31, 2016
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, 2016 and 2015:
|  | Three Months Ended
|  | March 31,
Millions |  | 2016 |  | 2015
Gross beginning balance |  | $ | 1,395.8 |  |  | $ | 1,350.0 |
Less beginning reinsurance recoverable on unpaid losses |  | (186.5 | ) |  | (161.7 | )
Net loss and LAE reserves |  | 1,209.3 |  |  | 1,188.3 |
Loss and LAE incurred relating to: |  |  |  |
Current year losses |  | 161.2 |  |  | 169.8 |
Prior year losses |  | (0.1 | ) |  | (1.9 | )
Total incurred losses and LAE |  | 161.1 |  |  | 167.9 |
Loss and LAE paid relating to: |  |  |  |
Current year losses |  | (23.1 | ) |  | (23.3 | )
Prior year losses |  | (148.6 | ) |  | (164.0 | )
Total loss and LAE payments |  | (171.7 | ) |  | (187.3 | )
Net ending balance |  | 1,198.7 |  |  | 1,168.9 |
Plus ending reinsurance recoverable on unpaid losses |  | 150.9 |  |  | 141.7 |
Gross ending balance |  | $ | 1,349.6 |  |  | $ | 1,310.6 |
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. During the three months ended March 31, 2016, OneBeacon experienced no net loss and LAE 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. Loss and LAE incurred relating to prior year losses for the three months ended March 31, 2015 For the three months ended March 31, 2015, White Mountains experienced net favorable loss reserve development of $1.9 million. For the three months ended March 31, 2015, OneBeacon had net favorable loss reserve development of $1.8 million primarily attributable to favorable development from Crop resulting from the 2014 crop year and favorable development in several other businesses, including Ocean Marine, Technology, Government Risks, Surety and Specialty Property. This favorable development was mostly offset by unfavorable development in Entertainment driven by several claims and by losses within the Inland Marine business driven by a few large claims. For the three months ended March 31, 2015, 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=6482485&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=6482485&loc=d3e14764-158437 + Details
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