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Segment Information | 6 Months Ended
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Jun. 30, 2013
Segment Reporting [Abstract] |
Segment Informartion | 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. Significant intercompany transactions among White Mountains’ segments have been eliminated herein. Financial information for White Mountains’ segments follows:
|  |  |  |  |  | HG Global/BAM |  |  |  |
Millions |  | OneBeacon |  | Sirius Group |  | HG |  | BAM |  | Other Operations |  | Total
Three Months Ended June 30, 2013 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earned insurance and reinsurance premiums |  | $ | 280.8 |  |  | $ | 216.6 |  |  | $ | .1 |  |  | $ | — |  |  | $ | — |  |  | $ | 497.5 |
Net investment income |  | 11.4 |  |  | 11.4 |  |  | .2 |  |  | 1.1 |  |  | 4.6 |  |  | 28.7 |
Net investment income - surplus note income |  | — |  |  | — |  |  | 10.0 |  |  | (10.0 | ) |  | — |  |  | — |
Net realized and unrealized investment (losses) gains |  | (25.5 | ) |  | 6.7 |  |  | (2.0 | ) |  | (9.4 | ) |  | (7.1 | ) |  | (37.3 | )
Other revenue |  | .6 |  |  | (16.0 | ) |  | — |  |  | — |  |  | 15.8 |  |  | .4 |
Total revenues |  | 267.3 |  |  | 218.7 |  |  | 8.3 |  |  | (18.3 | ) |  | 13.3 |  |  | 489.3 |
Losses and loss adjustment expenses |  | 157.0 |  |  | 117.6 |  |  | — |  |  | — |  |  | — |  |  | 274.6 |
Insurance and reinsurance acquisition expenses |  | 52.5 |  |  | 23.2 |  |  | — |  |  | .4 |  |  | — |  |  | 76.1 |
Other underwriting expenses |  | 54.6 |  |  | 29.8 |  |  | — |  |  | .1 |  |  | — |  |  | 84.5 |
General and administrative expenses |  | 2.9 |  |  | 6.0 |  |  | .5 |  |  | 7.9 |  |  | 22.9 |  |  | 40.2 |
Interest expense on debt |  | 3.3 |  |  | 6.5 |  |  | — |  |  | — |  |  | .5 |  |  | 10.3 |
Total expenses |  | 270.3 |  |  | 183.1 |  |  | .5 |  |  | 8.4 |  |  | 23.4 |  |  | 485.7 |
Pre-tax (loss) income |  | $ | (3.0 | ) |  | $ | 35.6 |  |  | $ | 7.8 |  |  | $ | (26.7 | ) |  | $ | (10.1 | ) |  | $ | 3.6 |
|  |  |  |  |  | HG Global/BAM |  |  |  |
Millions |  | OneBeacon |  | Sirius Group |  | HG |  | BAM |  | Other Operations |  | Total
Six Months Ended June 30, 2013 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earned insurance and reinsurance premiums |  | $ | 567.3 |  |  | $ | 425.5 |  |  | $ | .1 |  |  | $ | — |  |  | $ | — |  |  | $ | 992.9 |
Net investment income |  | 20.8 |  |  | 24.5 |  |  | .5 |  |  | 2.2 |  |  | 9.2 |  |  | 57.2 |
Net investment income - surplus note income |  | — |  |  | — |  |  | 20.1 |  |  | (20.1 | ) |  | — |  |  | — |
Net realized and unrealized investment gains (losses) |  | 2.9 |  |  | 19.8 |  |  | (2.2 | ) |  | (10.5 | ) |  | 27.9 |  |  | 37.9 |
Other revenue |  | 24.6 |  |  | (5.5 | ) |  | — |  |  | .1 |  |  | 9.5 |  |  | 28.7 |
Total revenues |  | 615.6 |  |  | 464.3 |  |  | 18.5 |  |  | (28.3 | ) |  | 46.6 |  |  | 1,116.7 |
Losses and loss adjustment expenses |  | 305.9 |  |  | 213.0 |  |  | — |  |  | — |  |  | — |  |  | 518.9 |
Insurance and reinsurance acquisition expenses |  | 107.3 |  |  | 66.5 |  |  | — |  |  | .5 |  |  | — |  |  | 174.3 |
Other underwriting expenses |  | 103.9 |  |  | 59.5 |  |  | — |  |  | .2 |  |  | — |  |  | 163.6 |
General and administrative expenses |  | 6.9 |  |  | 15.5 |  |  | .8 |  |  | 16.1 |  |  | 44.7 |  |  | 84.0 |
Interest expense on debt |  | 6.5 |  |  | 13.1 |  |  | — |  |  | — |  |  | .9 |  |  | 20.5 |
Total expenses |  | 530.5 |  |  | 367.6 |  |  | .8 |  |  | 16.8 |  |  | 45.6 |  |  | 961.3 |
Pre-tax income (loss) |  | $ | 85.1 |  |  | $ | 96.7 |  |  | $ | 17.7 |  |  | $ | (45.1 | ) |  | $ | 1.0 |  |  | $ | 155.4 |
Millions |  | OneBeacon |  | Sirius Group |  | Other Operations |  | Total
Three Months Ended June 30, 2012 |  |  |  |  |  |  |  |  |  |  |  |
Earned insurance and reinsurance premiums |  | $ | 280.3 |  |  | $ | 230.2 |  |  | $ | — |  |  | $ | 510.5 |
Net investment income |  | 14.0 |  |  | 17.1 |  |  | 9.3 |  |  | 40.4 |
Net realized and unrealized investment (losses) gains |  | (11.9 | ) |  | 18.1 |  |  | (14.3 | ) |  | (8.1 | )
Other revenue |  | .2 |  |  | (17.6 | ) |  | 16.9 |  |  | (.5 | )
Total revenues |  | 282.6 |  |  | 247.8 |  |  | 11.9 |  |  | 542.3 |
Losses and loss adjustment expenses |  | 151.4 |  |  | 112.5 |  |  | — |  |  | 263.9 |
Insurance and reinsurance acquisition expenses |  | 60.9 |  |  | 48.6 |  |  | — |  |  | 109.5 |
Other underwriting expenses |  | 51.3 |  |  | 27.0 |  |  | — |  |  | 78.3 |
General and administrative expenses |  | 2.6 |  |  | 6.2 |  |  | 33.3 |  |  | 42.1 |
Interest expense on debt |  | 4.0 |  |  | 6.6 |  |  | .3 |  |  | 10.9 |
Total expenses |  | 270.2 |  |  | 200.9 |  |  | 33.6 |  |  | 504.7 |
Pre-tax income (loss) |  | $ | 12.4 |  |  | $ | 46.9 |  |  | $ | (21.7 | ) |  | $ | 37.6 |
Millions |  | OneBeacon |  | Sirius Group |  | Other Operations |  | Total
Six Months Ended June 30, 2012 |  |  |  |  |  |  |  |  |  |  |  |
Earned insurance and reinsurance premiums |  | $ | 552.1 |  |  | $ | 456.4 |  |  | $ | — |  |  | $ | 1,008.5 |
Net investment income |  | 28.7 |  |  | 34.2 |  |  | 19.3 |  |  | 82.2 |
Net realized and unrealized investment gains |  | 17.9 |  |  | 31.8 |  |  | .8 |  |  | 50.5 |
Other revenue |  | .3 |  |  | .7 |  |  | 29.7 |  |  | 30.7 |
Total revenues |  | 599.0 |  |  | 523.1 |  |  | 49.8 |  |  | 1,171.9 |
Losses and loss adjustment expenses |  | 287.8 |  |  | 225.9 |  |  | — |  |  | 513.7 |
Insurance and reinsurance acquisition expenses |  | 119.0 |  |  | 99.6 |  |  | — |  |  | 218.6 |
Other underwriting expenses |  | 98.8 |  |  | 53.0 |  |  | — |  |  | 151.8 |
General and administrative expenses |  | 5.3 |  |  | 25.1 |  |  | 57.2 |  |  | 87.6 |
Interest expense on debt |  | 8.1 |  |  | 13.1 |  |  | .6 |  |  | 21.8 |
Total expenses |  | 519.0 |  |  | 416.7 |  |  | 57.8 |  |  | 993.5 |
Pre-tax income (loss) |  | $ | 80.0 |  |  | $ | 106.4 |  |  | $ | (8.0 | ) |  | $ | 178.4 |

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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 Statement of Financial Accounting Standard (FAS) -Number 131 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: 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 3: 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 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 26 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8844-108599 Reference 6: 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 7: 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 8: 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 9: 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 10: 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 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 41 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e9038-108599 Reference 13: 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 14: 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 15: 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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