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Segment Information (Tables) | 3 Months Ended
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Mar. 31, 2015
Segment Reporting [Abstract] |
Financial information for White Mountains' segments | 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 |  | Sirius Group |  | HG |  | BAM |  | Other Operations |  | Total
Three Months Ended March 31, 2015 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earned insurance and reinsurance premiums |  | $ | 286.6 |  |  | $ | 205.0 |  |  | $ | .5 |  |  | $ | .2 |  |  | $ | 2.0 |  |  | $ | 494.3 |
Net investment income |  | 10.5 |  |  | 8.0 |  |  | .4 |  |  | 1.0 |  |  | 3.4 |  |  | 23.3 |
Net investment income (loss) - surplus note interest |  | — |  |  | — |  |  | 4.0 |  |  | (4.0 | ) |  | — |  |  | — |
Net realized and unrealized investment gains |  | 14.2 |  |  | 79.9 |  |  | 1.1 |  |  | 3.0 |  |  | 5.2 |  |  | 103.4 |
Other (loss) revenue |  | (3.1 | ) |  | (27.4 | ) |  | — |  |  | .1 |  |  | 66.2 |  |  | 35.8 |
Total revenues |  | 308.2 |  |  | 265.5 |  |  | 6.0 |  |  | .3 |  |  | 76.8 |  |  | 656.8 |
Losses and LAE |  | 165.9 |  |  | 97.5 |  |  | — |  |  | — |  |  | 2.0 |  |  | 265.4 |
Insurance and reinsurance acquisition expenses |  | 51.0 |  |  | 42.6 |  |  | .1 |  |  | .8 |  |  | 1.1 |  |  | 95.6 |
Other underwriting expenses |  | 55.9 |  |  | 25.5 |  |  | — |  |  | .1 |  |  | — |  |  | 81.5 |
General and administrative expenses |  | 4.1 |  |  | 6.2 |  |  | .4 |  |  | 8.2 |  |  | 97.5 |  |  | 116.4 |
Interest expense |  | 3.2 |  |  | 6.8 |  |  | — |  |  | — |  |  | 1.1 |  |  | 11.1 |
Total expenses |  | 280.1 |  |  | 178.6 |  |  | .5 |  |  | 9.1 |  |  | 101.7 |  |  | 570.0 |
Pre-tax income (loss) |  | $ | 28.1 |  |  | $ | 86.9 |  |  | $ | 5.5 |  |  | $ | (8.8 | ) |  | $ | (24.9 | ) |  | $ | 86.8 |
|  |  |  |  |  | HG Global/BAM |  |  |  |
Millions |  | OneBeacon |  | Sirius Group |  | HG |  | BAM |  | Other Operations |  | Total
Three Months Ended March 31, 2014 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earned insurance and reinsurance premiums |  | $ | 276.5 |  |  | $ | 215.5 |  |  | $ | .2 |  |  | $ | .1 |  |  | $ | 1.3 |  |  | $ | 493.6 |
Net investment income |  | 10.4 |  |  | 8.7 |  |  | .3 |  |  | 1.4 |  |  | 3.9 |  |  | 24.7 |
Net investment income (loss) - surplus note interest |  | — |  |  | — |  |  | 3.9 |  |  | (3.9 | ) |  | — |  |  | — |
Net realized and unrealized investment gains |  | 18.9 |  |  | 28.1 |  |  | .7 |  |  | 3.0 |  |  | 13.1 |  |  | 63.8 |
Other revenue (loss) |  | 1.0 |  |  | (5.3 | ) |  | — |  |  | .2 |  |  | .7 |  |  | (3.4 | )
Total revenues |  | 306.8 |  |  | 247.0 |  |  | 5.1 |  |  | .8 |  |  | 19.0 |  |  | 578.7 |
Losses and LAE |  | 149.4 |  |  | 78.8 |  |  | — |  |  | — |  |  | 1.1 |  |  | 229.3 |
Insurance and reinsurance acquisition expenses |  | 46.7 |  |  | 47.4 |  |  | .1 |  |  | .4 |  |  | .5 |  |  | 95.1 |
Other underwriting expenses |  | 49.4 |  |  | 31.8 |  |  | — |  |  | .1 |  |  | .1 |  |  | 81.4 |
General and administrative expenses |  | 3.3 |  |  | 8.4 |  |  | .4 |  |  | 8.9 |  |  | 29.3 |  |  | 50.3 |
Interest expense |  | 3.2 |  |  | 6.6 |  |  | — |  |  | — |  |  | .3 |  |  | 10.1 |
Total expenses |  | 252.0 |  |  | 173.0 |  |  | .5 |  |  | 9.4 |  |  | 31.3 |  |  | 466.2 |
Pre-tax income (loss) |  | $ | 54.8 |  |  | $ | 74.0 |  |  | $ | 4.6 |  |  | $ | (8.6 | ) |  | $ | (12.3 | ) |  | $ | 112.5 |

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- Definition Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8721-108599 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8813-108599 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 Reference 4: 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 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8736-108599 + Details
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