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Segment Information | 12 Months Ended
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Dec. 31, 2014
Segment Reporting [Abstract] |
Segment Information | Segment Information White Mountains has determined that its reportable segments are OneBeacon, Sirius Group, HG Global/BAM and Other Operations. White Mountains has made its segment determination based on consideration of the following criteria: (i) the nature of the business activities of each of the Company’s subsidiaries and affiliates; (ii) the manner in which the Company’s subsidiaries and affiliates are organized; (iii) the existence of primary managers responsible for specific subsidiaries and affiliates; and (iv) the organization of information provided to the chief operating decision makers and the Board of Directors. OneBeacon is a specialty property and casualty insurance writer that offers a wide range of insurance products through independent agencies, regional and national brokers, wholesalers and managing general agencies. Sirius Group provides insurance and reinsurance products for property, accident and health, aviation and space, trade credit, marine, agriculture and certain other exposures on a worldwide basis. The HG Global/BAM segment consists of White Mountains’s investment in HG Global and the consolidated results of BAM. BAM is a municipal bond insurer domiciled in New York that was established to provide insurance on bonds issued to support essential U.S. public purposes such as schools, utilities, core governmental functions and existing transportation facilities. HG Global, together with its subsidiaries, provided the initial capitalization of BAM through the purchase of BAM Surplus Notes. HG Global also provides 15%-of-par, first loss reinsurance protection for policies underwritten by BAM. BAM's results are attributed to non-controlling interests. Other Operations consists of the Company, the Company’s intermediate holding companies, WM Advisors, WM Life Re, Tranzact, Wobi, QuoteLab, Star & Shield and SSIE as well as and various other entities and investments. Significant intercompany transactions among White Mountains’s segments have been eliminated herein. SSIE’s results are attributed to non-controlling interests. Financial information for White Mountains’s segments follows:
|  |  |  |  |  | HG Global/BAM |  |  |  |
Millions |  | OneBeacon |  | Sirius Group |  | HG Global |  | BAM(1) |  | Other Operations |  | Total
Year Ended December 31, 2014 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earned insurance and reinsurance premiums |  | $ | 1,177.1 |  |  | $ | 873.9 |  |  | $ | 1.4 |  |  | $ | .4 |  |  | $ | 6.1 |  |  | $ | 2,058.9 |
Net investment income |  | 41.7 |  |  | 41.1 |  |  | 1.4 |  |  | 5.7 |  |  | 15.1 |  |  | 105.0 |
Net investment income (loss) - surplus note interest |  | — |  |  | — |  |  | 15.7 |  |  | (15.7 | ) |  | — |  |  | — |
Net realized and unrealized investment gains |  | 40.4 |  |  | 209.2 |  |  | 1.7 |  |  | 6.6 |  |  | 26.0 |  |  | 283.9 |
Other revenue (loss) |  | 5.8 |  |  | (62.4 | ) |  | — |  |  | .6 |  |  | 118.4 |  |  | 62.4 |
Total revenues |  | 1,265.0 |  |  | 1,061.8 |  |  | 20.2 |  |  | (2.4 | ) |  | 165.6 |  |  | 2,510.2 |
Losses and LAE |  | 815.1 |  |  | 345.3 |  |  | — |  |  | — |  |  | 8.9 |  |  | 1,169.3 |
Insurance and reinsurance acquisition expenses |  | 203.3 |  |  | 193.6 |  |  | .3 |  |  | 1.8 |  |  | .8 |  |  | 399.8 |
Other underwriting expenses |  | 179.2 |  |  | 129.7 |  |  | — |  |  | .4 |  |  | — |  |  | 309.3 |
General and administrative expenses |  | 13.8 |  |  | 30.5 |  |  | 1.6 |  |  | 35.9 |  |  | 206.4 |  |  | 288.2 |
Interest expense |  | 13.0 |  |  | 26.3 |  |  | — |  |  | — |  |  | 2.6 |  |  | 41.9 |
Total expenses |  | 1,224.4 |  |  | 725.4 |  |  | 1.9 |  |  | 38.1 |  |  | 218.7 |  |  | 2,208.5 |
Pre-tax income (loss) |  | $ | 40.6 |  |  | $ | 336.4 |  |  | $ | 18.3 |  |  | $ | (40.5 | ) |  | $ | (53.1 | ) |  | $ | 301.7 |
|  |  |  |  |  | HG Global/BAM |  |  |  |
Millions |  | OneBeacon |  | Sirius Group |  | HG Global |  | BAM(1) |  | Other Operations |  | Total
Year Ended December 31, 2013 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earned insurance and reinsurance premiums |  | $ | 1,120.4 |  |  | $ | 866.4 |  |  | $ | .4 |  |  | $ | .1 |  |  | $ | — |  |  | $ | 1,987.3 |
Net investment income |  | 41.1 |  |  | 48.8 |  |  | 1.0 |  |  | 4.7 |  |  | 15.3 |  |  | 110.9 |
Net investment income (loss) - surplus note interest |  | — |  |  | — |  |  | 40.2 |  |  | (40.2 | ) |  | — |  |  | — |
Net realized and unrealized investment gains (losses) |  | 49.4 |  |  | 26.7 |  |  | (2.0 | ) |  | (9.3 | ) |  | 96.9 |  |  | 161.7 |
Other revenue |  | 31.2 |  |  | 16.8 |  |  | — |  |  | .4 |  |  | 9.1 |  |  | 57.5 |
Total revenues |  | 1,242.1 |  |  | 958.7 |  |  | 39.6 |  |  | (44.3 | ) |  | 121.3 |  |  | 2,317.4 |
Losses and LAE |  | 622.1 |  |  | 418.4 |  |  | — |  |  | — |  |  | — |  |  | 1,040.5 |
Insurance and reinsurance acquisition expenses |  | 208.9 |  |  | 166.5 |  |  | .1 |  |  | 1.4 |  |  | — |  |  | 376.9 |
Other underwriting expenses |  | 204.8 |  |  | 126.1 |  |  | — |  |  | .4 |  |  | — |  |  | 331.3 |
General and administrative expenses |  | 12.0 |  |  | 32.2 |  |  | 1.4 |  |  | 32.5 |  |  | 103.2 |  |  | 181.3 |
Interest expense |  | 13.0 |  |  | 26.3 |  |  | — |  |  | — |  |  | 3.2 |  |  | 42.5 |
Total expenses |  | 1,060.8 |  |  | 769.5 |  |  | 1.5 |  |  | 34.3 |  |  | 106.4 |  |  | 1,972.5 |
Pre-tax income (loss) |  | $ | 181.3 |  |  | $ | 189.2 |  |  | $ | 38.1 |  |  | $ | (78.6 | ) |  | $ | 14.9 |  |  | $ | 344.9 |
|  |  |  |  |  | HG Global/BAM |  |  |  |
Millions |  | OneBeacon |  | Sirius Group |  | HG Global |  | BAM(1) |  | Other Operations |  | Total
Year Ended December 31, 2012 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earned insurance and reinsurance premiums |  | $ | 1,132.0 |  |  | $ | 931.6 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 2,063.6 |
Net investment income |  | 53.6 |  |  | 65.0 |  |  | .3 |  |  | 1.9 |  |  | 32.8 |  |  | 153.6 |
Net investment income (loss) - surplus note interest |  | — |  |  | — |  |  | 18.4 |  |  | (18.4 | ) |  | — |  |  | — |
Net realized and unrealized investment gains |  | 55.7 |  |  | 17.3 |  |  | — |  |  | — |  |  | 45.2 |  |  | 118.2 |
Other (loss) revenue |  | (.5 | ) |  | 70.6 |  |  | — |  |  | — |  |  | 30.2 |  |  | 100.3 |
Total revenues |  | 1,240.8 |  |  | 1,084.5 |  |  | 18.7 |  |  | (16.5 | ) |  | 108.2 |  |  | 2,435.7 |
Losses and LAE |  | 650.0 |  |  | 543.9 |  |  | — |  |  | — |  |  | — |  |  | 1,193.9 |
Insurance and reinsurance acquisition expenses |  | 249.4 |  |  | 180.8 |  |  | — |  |  | — |  |  | — |  |  | 430.2 |
Other underwriting expenses |  | 205.2 |  |  | 116.4 |  |  | — |  |  | .2 |  |  | — |  |  | 321.8 |
General and administrative expenses |  | 13.4 |  |  | 45.9 |  |  | 4.5 |  |  | 19.6 |  |  | 98.8 |  |  | 182.2 |
Interest expense |  | 16.9 |  |  | 26.2 |  |  | — |  |  | — |  |  | 1.7 |  |  | 44.8 |
Total expenses |  | 1,134.9 |  |  | 913.2 |  |  | 4.5 |  |  | 19.8 |  |  | 100.5 |  |  | 2,172.9 |
Pre-tax income (loss) |  | $ | 105.9 |  |  | $ | 171.3 |  |  | $ | 14.2 |  |  | $ | (36.3 | ) |  | $ | 7.7 |  |  | $ | 262.8 |
|  |  |  |  |  | HG Global/BAM |  |  |  |
Selected Balance Sheet Data Millions |  | OneBeacon |  | Sirius Group |  | HG Global |  | BAM |  | Other Operations |  | Total
December 31, 2014: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total investments |  | $ | 2,527.0 |  |  | $ | 3,178.4 |  |  | $ | 121.0 |  |  | $ | 454.2 |  |  | $ | 605.7 |  |  | $ | 6,886.3 |
Reinsurance recoverable on paid and unpaid losses |  | 173.8 |  |  | 333.6 |  |  | — |  |  | — |  |  | .1 |  |  | 507.5 |
Assets held for sale |  | 58.1 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 58.1 |
Total assets |  | 3,561.0 |  |  | 5,034.7 |  |  | 704.4 |  |  | (89.4 | ) | (2 | ) | 1,246.2 |  |  | 10,456.9 |
Loss and LAE reserves |  | 1,342.2 |  |  | 1,809.8 |  |  | — |  |  | — |  |  | 7.8 |  |  | 3,159.8 |
Total liabilities |  | 2,510.5 |  |  | 3,180.6 |  |  | 120.9 |  |  | 32.5 |  |  | 72.8 |  |  | 5,917.3 |
Total White Mountains’s common shareholders’ equity |  | 788.4 |  |  | 1,604.1 |  |  | 565.5 |  |  | — |  |  | 1,038.6 |  |  | 3,996.6 |
Non-controlling interest |  | 262.1 |  |  | 250.0 |  |  | 17.9 |  |  | (121.9 | ) |  | 134.9 |  |  | 543.0 |
December 31, 2013: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total investments |  | $ | 2,364.9 |  |  | $ | 3,251.4 |  |  | $ | 107.9 |  |  | $ | 468.6 |  |  | $ | 999.8 |  |  | $ | 7,192.6 |
Reinsurance recoverable on paid and unpaid losses |  | 89.9 |  |  | 363.6 |  |  | — |  |  | — |  |  | — |  |  | 453.5 |
Assets held for sale |  | 1,880.1 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 1,880.1 |
Total assets |  | 5,191.3 |  |  | 5,124.1 |  |  | 675.0 |  |  | (77.9 | ) | (2 | ) | 1,231.8 |  |  | 12,144.3 |
Loss and LAE reserves |  | 1,054.3 |  |  | 2,025.0 |  |  | — |  |  | — |  |  | — |  |  | 3,079.3 |
Liabilities held for sale |  | 1,880.1 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 1,880.1 |
Total liabilities |  | 4,083.9 |  |  | 3,414.5 |  |  | 68.9 |  |  | 19.7 |  |  | 159.9 |  |  | 7,746.9 |
Total White Mountains’s common shareholders’ equity |  | 830.6 |  |  | 1,459.6 |  |  | 589.5 |  |  | — |  |  | 1,025.8 |  |  | 3,905.5 |
Non-controlling interest |  | 276.8 |  |  | 250.0 |  |  | 16.6 |  |  | (97.6 | ) |  | 46.1 |  |  | 491.9 |
(1) | BAM manages its affairs on a statutory accounting basis. BAM’s statutory surplus includes surplus notes and is not reduced by accruals of interest expense on the surplus notes. BAM’s statutory surplus is reduced only after a payment of principal or interest has been approved by the New York Department of Financial Services.
(2) | BAM total assets reflect the elimination of $503.0 in surplus notes issued to HG Global and its subsidiaries, and $74.4 and $58.6 in accrued interest related to those surplus notes as of December 31, 2014 and 2013.

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- Definition The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 29 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8864-108599 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8933-108599 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 26 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8844-108599 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8538-108599 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8380-108599 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 34 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8981-108599 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 35 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8984-108599 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e9038-108599 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8906-108599 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 42 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e9054-108599 Reference 11: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 31 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8924-108599 Reference 12: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 40 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e9031-108599 Reference 13: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8971-108599 Reference 14: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8595-108599 + Details
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