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Loss and Loss Adjustment Expense Reserves | 3 Months Ended
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Mar. 31, 2015
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, 2015 and 2014:
|  | Three Months Ended
|  | March 31,
Millions |  | 2015 |  | 2014
Gross beginning balance |  | $ | 3,159.8 |  |  | $ | 3,079.3 |
Less beginning reinsurance recoverable on unpaid losses |  | (483.9 | ) |  | (428.1 | )
Net loss and LAE reserves |  | 2,675.9 |  |  | 2,651.2 |
Loss and LAE reserves consolidated — SSIE |  | — |  |  | 13.6 |
Loss and LAE incurred relating to: |  |  |  |  |  |
Current year losses |  | 266.8 |  |  | 240.5 |
Prior year losses |  | (1.4 | ) |  | (11.2 | )
Total incurred losses and LAE |  | 265.4 |  |  | 229.3 |
Foreign currency translation adjustment to loss and LAE reserves |  | (22.4 | ) |  | 1.8 |
Loss and LAE paid relating to: |  |  |  |  |  |
Current year losses |  | (40.6 | ) |  | (35.0 | )
Prior year losses |  | (280.2 | ) |  | (237.7 | )
Total loss and LAE payments |  | (320.8 | ) |  | (272.7 | )
Net ending balance |  | 2,598.1 |  |  | 2,623.2 |
Plus ending reinsurance recoverable on unpaid losses |  | 436.9 |  |  | 425.2 |
Gross ending balance |  | $ | 3,035.0 |  |  | $ | 3,048.4 |
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 $1.4 million. For the three months ended March 31, 2015, OneBeacon had net favorable loss reserve development of $1.8 million, Sirius Group had net unfavorable loss reserve development of $0.5 million and 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, 2014 For the three months ended March 31, 2014, White Mountains experienced $11.2 million of net favorable loss reserve development. For the three months ended March 31, 2014, OneBeacon had net favorable loss reserve development of $1.4 million primarily related to its ocean marine business and its technology business. For the three months ended March 31, 2014, Sirius Group had net favorable loss reserve development of $9.8 million primarily related to its casualty and accident and health lines of business.

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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 SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 13 -Article 7 Reference 2: 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 Reference 3: 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 4: 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 5: 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 + Details
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