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Segment Information (Tables) | 12 Months Ended
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Dec. 31, 2012
Segment Reporting [Abstract] |
Financial information for White Mountains' segments | Financial information for White Mountains’ segments follows:
|  |  |  |  |  | HG Global/BAM |  |  |  |
Millions |  | OneBeacon |  | Sirius Group |  | HG Global |  | BAM |  | 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 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 on debt |  | 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 |
Millions |  | OneBeacon |  | Sirius Group |  | Other Operations |  | Total
Year ended December 31, 2011 |  |  |  |  |  |  |  |  |  |  |  |
Earned insurance and reinsurance premiums |  | $ | 1,012.2 |  |  | $ | 912.3 |  |  | $ | — |  |  | $ | 1,924.5 |
Net investment income |  | 71.4 |  |  | 89.9 |  |  | 23.2 |  |  | 184.5 |
Net realized and unrealized investment gains |  | 10.6 |  |  | 53.2 |  |  | 10.3 |  |  | 74.1 |
Other revenue |  | (12.4 | ) |  | 4.1 |  |  | (1.7 | ) |  | (10.0 | )
Total revenues |  | 1,081.8 |  |  | 1,059.5 |  |  | 31.8 |  |  | 2,173.1 |
Losses and LAE |  | 548.3 |  |  | 626.0 |  |  | — |  |  | 1,174.3 |
Insurance and reinsurance acquisition expenses |  | 221.2 |  |  | 181.0 |  |  | — |  |  | 402.2 |
Other underwriting expenses |  | 162.3 |  |  | 105.8 |  |  | — |  |  | 268.1 |
General and administrative expenses |  | 9.8 |  |  | 34.1 |  |  | 131.4 |  |  | 175.3 |
Interest expense on debt |  | 20.5 |  |  | 31.6 |  |  | 3.1 |  |  | 55.2 |
Total expenses |  | 962.1 |  |  | 978.5 |  |  | 134.5 |  |  | 2,075.1 |
Pre-tax income (loss) |  | $ | 119.7 |  |  | $ | 81.0 |  |  | $ | (102.7 | ) |  | $ | 98.0 |
Millions |  | OneBeacon |  | Sirius Group |  | Other Operations |  | Total
Year ended December 31, 2010 |  |  |  |  |  |  |  |  |  |  |  |
Earned insurance and reinsurance premiums |  | $ | 1,181.1 |  |  | $ | 847.9 |  |  | $ | — |  |  | $ | 2,029.0 |
Net investment income |  | 96.6 |  |  | 96.5 |  |  | 15.8 |  |  | 208.9 |
Net realized and unrealized investment gains (losses) |  | 74.6 |  |  | (14.8 | ) |  | 17.8 |  |  | 77.6 |
Other revenue |  | (.6 | ) |  | 40.9 |  |  | (22.1 | ) |  | 18.2 |
Total revenues |  | 1,351.7 |  |  | 970.5 |  |  | 11.5 |  |  | 2,333.7 |
Losses and LAE |  | 685.6 |  |  | 531.0 |  |  | — |  |  | 1,216.6 |
Insurance and reinsurance acquisition expenses |  | 252.1 |  |  | 167.5 |  |  | — |  |  | 419.6 |
Other underwriting expenses |  | 196.1 |  |  | 99.8 |  |  | — |  |  | 295.9 |
General and administrative expenses |  | 12.9 |  |  | 31.6 |  |  | 110.5 |  |  | 155.0 |
Interest expense on debt |  | 29.6 |  |  | 26.6 |  |  | 1.1 |  |  | 57.3 |
Total expenses |  | 1,176.3 |  |  | 856.5 |  |  | 111.6 |  |  | 2,144.4 |
Pre-tax income (loss) |  | $ | 175.4 |  |  | $ | 114.0 |  |  | $ | (100.1 | ) |  | $ | 189.3 |
Schedule of selected balance sheet data by segment |
|  |  |  |  |  | HG Global/BAM |  |  |  |
Selected Balance Sheet Data Millions |  | OneBeacon |  | Sirius Group |  | HG Global |  | BAM |  | Other Operations |  | Total
December 31, 2012 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total investments |  | $ | 2,291.5 |  |  | $ | 3,534.3 |  |  | $ | 101.5 |  |  | $ | 472.4 |  |  | $ | 878.4 |  |  | $ | 7,278.1 |
Reinsurance recoverable on paid and unpaid losses |  | 110.7 |  |  | 336.3 |  |  | — |  |  | — |  |  | — |  |  | 447.0 |
Assets held for sale |  | 2,226.8 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 2,226.8 |
Total assets |  | 5,382.3 |  |  | 5,962.0 |  |  | 623.6 |  |  | (28.6 | ) | (1 | ) | 956.1 |  |  | 12,895.4 |
Loss and LAE reserves |  | 1,000.0 |  |  | 2,168.9 |  |  | — |  |  | — |  |  | — |  |  | 3,168.9 |
Liabilities held for sale |  | 2,226.8 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 2,226.8 |
Total liabilities |  | 4,365.0 |  |  | 4,123.2 |  |  | .9 |  |  | 7.4 |  |  | 140.7 |  |  | 8,637.2 |
Total White Mountains’ common shareholders’ equity |  | 763.1 |  |  | 1,559.7 |  |  | 606.2 |  |  | — |  |  | 802.8 |  |  | 3,731.8 |
Non-controlling interest |  | 254.2 |  |  | 279.1 |  |  | 16.5 |  |  | (36.0 | ) |  | 12.6 |  |  | 526.4 |
December 31, 2011 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total investments |  | $ | 2,707.6 |  |  | $ | 3,640.5 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,919.9 |  |  | $ | 8,268.0 |
Reinsurance recoverable on paid and unpaid losses |  | 2,184.1 |  |  | 353.7 |  |  | — |  |  | — |  |  | — |  |  | 2,537.8 |
Assets held for sale |  | 132.6 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 132.6 |
Total assets |  | 5,792.4 |  |  | 5,337.9 |  |  | — |  |  | — |  |  | 2,933.7 |  |  | 14,064.0 |
Loss and LAE reserves |  | 3,358.6 |  |  | 2,343.7 |  |  | — |  |  | — |  |  | — |  |  | 5,702.3 |
Liabilities held for sale |  | 107.6 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 107.6 |
Total liabilities |  | 4,678.5 |  |  | 3,784.1 |  |  | — |  |  | — |  |  | 933.5 |  |  | 9,396.1 |
Total White Mountains’ common shareholders’ equity |  | 826.7 |  |  | 1,264.3 |  |  | — |  |  | — |  |  | 1,996.7 |  |  | 4,087.7 |
Non-controlling interest |  | 287.2 |  |  | 289.5 |  |  | — |  |  | — |  |  | 3.5 |  |  | 580.2 |
(1) BAM total assets reflect the elimination of $503.0 in surplus notes issued to HG Global and its subsidiaries, and $18.4 in accrued interest related to those surplus notes.

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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 22 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8736-108599 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 Statement of Financial Accounting Standard (FAS) -Number 131 -Paragraph 27, 28 -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 5: 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 6: 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 + Details
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