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Segment Information | 3 Months Ended
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Mar. 31, 2017
Segment Reporting [Abstract] |
Segment Informartion | Segment Information White Mountains has determined that its reportable segments are OneBeacon, HG Global/BAM and Other Operations. As a result of the Sirius Group and Tranzact sales, the results of operations for Sirius Group, previously reported in its own segment, and Tranzact, previously reported in the Other Operations segment, have been classified as discontinued operations and are now presented, net of related income taxes, as such in the statement of operations and comprehensive income. Prior year amounts have been reclassified to conform to the current period’s presentation. See Note 17 — “Held for Sale and Discontinued 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’s segments have been eliminated herein. Financial information for White Mountains’s segments follows:
|  |  |  | HG Global/BAM |  |  |  |
Millions |  | OneBeacon |  | HG |  | BAM(1) |  | Other Operations |  | Total
Three Months Ended March 31, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |
Earned insurance premiums |  | $ | 261.8 |  |  | $ | 1.5 |  |  | $ | .5 |  |  | $ | 1.0 |  |  | $ | 264.8 |
Net investment income |  | 12.2 |  |  | .6 |  |  | 2.0 |  |  | 11.3 |  |  | 26.1 |
Net investment income (loss) - surplus note interest |  | — |  |  | 4.8 |  |  | (4.8 | ) |  | — |  |  | — |
Net realized and unrealized investment gains |  | 15.0 |  |  | .3 |  |  | 1.0 |  |  | 35.0 |  |  | 51.3 |
Other revenue |  | 3.4 |  |  | — |  |  | .4 |  |  | 39.9 |  | (2) | 43.7 |
Total revenues |  | 292.4 |  |  | 7.2 |  |  | (.9 | ) |  | 87.2 |  |  | 385.9 |
Losses and LAE |  | 150.6 |  |  | — |  |  | — |  |  | 1.1 |  |  | 151.7 |
Insurance acquisition expenses |  | 45.3 |  |  | .3 |  |  | .9 |  |  | .1 |  |  | 46.6 |
Other underwriting expenses |  | 51.7 |  |  | — |  |  | .1 |  |  | — |  |  | 51.8 |
General and administrative expenses |  | 4.7 |  |  | .3 |  |  | 10.3 |  |  | 76.0 |  | (3) | 91.3 |
Amortization of other intangible assets |  | .3 |  |  | — |  |  | — |  |  | 2.6 |  |  | 2.9 |
Interest expense |  | 3.3 |  |  | — |  |  | — |  |  | .4 |  |  | 3.7 |
Total expenses |  | 255.9 |  |  | .6 |  |  | 11.3 |  |  | 80.2 |  |  | 348.0 |
Pre-tax income (loss) |  | $ | 36.5 |  |  | $ | 6.6 |  |  | $ | (12.2 | ) |  | $ | 7.0 |  |  | $ | 37.9 |
|  |  |  | HG Global/BAM |  |  |  |
Millions |  | OneBeacon |  | HG |  | BAM(1) |  | Other Operations |  | Total
Three Months Ended March 31, 2016 |  |  |  |  |  |  |  |  |  |  |  |  |
Earned insurance premiums |  | $ | 278.6 |  |  | $ | .9 |  |  | $ | .3 |  |  | $ | 2.3 |  |  | $ | 282.1 |
Net investment income |  | 14.4 |  |  | .5 |  |  | 1.6 |  |  | 1.4 |  |  | 17.9 |
Net investment income (loss) - surplus note interest |  | — |  |  | 4.5 |  |  | (4.5 | ) |  | — |  |  | — |
Net realized and unrealized investment gains |  | 16.6 |  |  | 2.1 |  |  | 4.9 |  |  | 5.9 |  |  | 29.5 |
Other revenue |  | .9 |  |  | — |  |  | .1 |  |  | 38.8 |  | (2) | 39.8 |
Total revenues |  | 310.5 |  |  | 8.0 |  |  | 2.4 |  |  | 48.4 |  |  | 369.3 |
Losses and LAE |  | 158.8 |  |  | — |  |  | — |  |  | 2.3 |  |  | 161.1 |
Insurance acquisition expenses |  | 51.0 |  |  | .2 |  |  | .7 |  |  | .8 |  |  | 52.7 |
Other underwriting expenses |  | 55.3 |  |  | — |  |  | .1 |  |  | — |  |  | 55.4 |
General and administrative expenses |  | 3.6 |  |  | .5 |  |  | 9.2 |  |  | 70.7 |  | (3) | 84.0 |
Amortization of other intangible assets |  | .3 |  |  | — |  |  | — |  |  | 2.8 |  |  | 3.1 |
Interest expense |  | 3.3 |  |  | — |  |  | — |  |  | 1.2 |  |  | 4.5 |
Total expenses |  | 272.3 |  |  | .7 |  |  | 10.0 |  |  | 77.8 |  |  | 360.8 |
Pre-tax income (loss) |  | $ | 38.2 |  |  | $ | 7.3 |  |  | $ | (7.6 | ) |  | $ | (29.4 | ) |  | $ | 8.5 |
(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) Includes $32.5 from MediaAlpha for the three months ended March 31, 2017, and $32.7 from MediaAlpha for the three months ended March 31, 2016. (3) Includes $30.9 from MediaAlpha for the three months ended March 31, 2017, and $30.5 from MediaAlpha for the three months ended March 31, 2016.

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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 34 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8981-108599 Reference 2: 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=68060357&loc=d3e9038-108599 Reference 3: 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=68060357&loc=d3e8971-108599 Reference 4: 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=68060357&loc=d3e8595-108599 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=68060357&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 32 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8933-108599 Reference 7: 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=68060357&loc=d3e8844-108599 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=68060357&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 40 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e9031-108599 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=68060357&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 10 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8538-108599 Reference 12: 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=68060357&loc=d3e8864-108599 Reference 13: 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=68060357&loc=d3e8924-108599 Reference 14: 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=68060357&loc=d3e8906-108599 + Details
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