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Investments in Unconsolidated Affiliates (Tables) | 12 Months Ended
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Dec. 31, 2012
Equity Method Investments and Joint Ventures [Abstract] |
Schedule of investments in unconsolidated affiliates | White Mountains’ investments in unconsolidated affiliates represent investments in other companies in which White Mountains has a significant voting and economic interest but does not control the entity.
|  | December 31,
Millions |  | 2012 |  | 2011
Symetra common shares |  | $ | 288.4 |  |  | $ | 261.0 |
Unrealized gains from Symetra’s fixed maturity portfolio |  | 62.8 |  |  | — |
Carrying value of Symetra common shares |  | $ | 351.2 |  |  | $ | 261.0 |
Symetra warrants |  | 30.3 |  |  | 12.6 |
Total investment in Symetra |  | 381.5 |  |  | 273.6 |
Hamer, LLC (1) |  | 4.0 |  |  | — |
Bri-Mar Manufacturing, LLC (1) |  | 1.9 |  |  | — |
Pentelia Capital Management |  | .5 |  |  | 1.7 |
Total investments in unconsolidated affiliates |  | $ | 387.9 |  |  | $ | 275.3 |
(1) As of October 1, 2012, Hamer and Bri-Mar are no longer consolidated and are accounted for as investments in unconsolidated affiliates.
Schedule of changes in unconsolidated affiliates | The following table summarizes amounts recorded by White Mountains relating to its investment in Symetra:
Millions |  | Common shares |  | Warrants |  | Total
Carrying value of investment in Symetra as of December 31, 2009 (2) |  | $ | 269.2 |  |  | $ | 38.5 |  |  | $ | 307.7 |
Equity in earnings (1)(3)(8) |  | 11.1 |  |  | — |  |  | 11.1 |
Net unrealized gains from Symetra’s fixed maturity portfolio (6)(7) |  | 72.7 |  |  | — |  |  | 72.7 |
Dividends received |  | (2.6 | ) |  | — |  |  | (2.6 | )
Decrease in value of warrants |  | — |  |  | (1.4 | ) |  | (1.4 | )
Carrying value of investment in Symetra as of December 31, 2010 (2) |  | 350.4 |  |  | 37.1 |  |  | 387.5 |
Equity in earnings (1)(8) |  | 28.2 |  |  | — |  |  | 28.2 |
Impairment of equity in earnings of Symetra (4) |  | (50.0 | ) |  | — |  |  | (50.0 | )
Equity in net unrealized gains from Symetra’s fixed maturity portfolio (7) |  | 85.0 |  |  | — |  |  | 85.0 |
Impairment of net unrealized gains from Symetra’s fixed maturity portfolio (5) |  | (148.6 | ) |  | — |  |  | (148.6 | )
Dividends received |  | (4.0 | ) |  | — |  |  | (4.0 | )
Decrease in value of warrants |  | — |  |  | (24.5 | ) |  | (24.5 | )
Carrying value of investment in Symetra as of December 31, 2011 (2) |  | 261.0 |  |  | 12.6 |  |  | 273.6 |
Equity in earnings (1)(8)(9) |  | 32.3 |  |  | — |  |  | 32.3 |
Equity in net unrealized gains from Symetra’s fixed maturity portfolio (7) |  | 62.8 |  |  | — |  |  | 62.8 |
Dividends received |  | (4.9 | ) |  | — |  |  | (4.9 | )
Increase in value of warrants |  | — |  |  | 17.7 |  |  | 17.7 |
Carrying value of investment in Symetra as of December 31, 2012 (2)(11) |  | $ | 351.2 |  |  | $ | 30.3 |  |  | $ | 381.5 |
(1) | Equity in earnings for the years end December 31, 2012, 2011 and 2010 excludes tax expense of $2.6, $2.3, and $1.4
(2) | Includes White Mountains’ equity in net unrealized gains (losses) from Symetra’s fixed maturity portfolio of $62.8, $0, and $63.7 as of December 31, 2012, 2011 and 2010, which excludes tax expense of $5.1, $0 and $5.2
(3) | Includes a $17.9 loss from the dilutive effect of Symetra’s public offering
(4) | Impairment of equity in earnings of Symetra excludes tax benefit of $4.1
(5) | Impairment of net unrealized gains from Symetra’s fixed maturity portfolio excludes tax benefit of $12.0
(6) | Includes a $1.9 gain from the dilutive effect of Symetra’s public offering.
(7) | Net unrealized gains (losses) from Symetra’s fixed maturity portfolio excludes tax (expense) benefit of $(5.1), $(6.9) and $0.8 for the years ended December 31, 2012, 2011 and 2010.
(8) | Equity in earnings for the years end December 31, 2012, 2011 and 2010 includes $1.3, $1.0, and $0.8 loss from the dilutive effect of Symetra’s yearly dividend and the issuance of restricted shares by Symetra
(9) | Equity in earnings includes $3.5 increase relating to the pre-tax amortization of Symetra common share impairment from December 31, 2012.
(10) | Net unrealized gains includes $13.1 increase relating to the pre-tax amortization of Symetra common share impairment from December 31, 2012.
(11) | The aggregate value of White Mountains’ investment in common shares of Symetra was $225.9 based upon the quoted market price of $12.98 per share
at December 31, 2012.
Summarized statement of financial position of Symetra | The following table summarizes financial information for Symetra as of December 31, 2012 and 2011:
|  | December 31,
Millions |  | 2012 |  | 2011
Symetra balance sheet data: |  |  |  |  |  |
Total investments |  | $ | 27,556.4 |  |  | $ | 26,171.7 |
Separate account assets |  | 807.7 |  |  | 795.8 |
Total assets (1) |  | 29,460.9 |  |  | 28,183.3 |
Policyholder liabilities |  | 23,735.2 |  |  | 23,140.6 |
Long-term debt |  | 449.4 |  |  | 449.2 |
Separate account liabilities |  | 807.7 |  |  | 795.8 |
Total liabilities (1) |  | 25,830.8 |  |  | 25,068.4 |
Common shareholders’ equity (1) |  | 3,630.1 |  |  | 3,114.9 |
Summarized statement of operations of Symetra | The following table summarizes financial information for Symetra for the years ended December 31, 2012, 2011 and 2010:
|  | Years ended December 31,
Millions |  | 2012 |  | 2011 |  | 2010
Symetra income statement data: |  |  |  |  |  |  |  |
Net premiums earned |  | $ | 605.0 |  |  | $ | 540.5 |  |  | $ | 473.0 |
Net investment income |  | 1,275.2 |  |  | 1,270.9 |  |  | 1,199.4 |
Total revenues (1) |  | 2,101.2 |  |  | 1,999.3 |  |  | 1,878.8 |
Policy benefits |  | 1,371.8 |  |  | 1,307.3 |  |  | 1,234.6 |
Total expenses (1) |  | 1,831.1 |  |  | 1,726.1 |  |  | 1,600.5 |
Net income (1) |  | 205.4 |  |  | 195.8 |  |  | 193.8 |
Comprehensive net income |  | 549.3 |  |  | 785.5 |  |  | 679.0 |
(1) Amounts for the years ended December 31, 2011 and 2010 have been restated for the effect of Symetra’s adoption of ASU 2010-26.

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- Definition Tabular disclosure of investments in and advances to affiliates. Does not include the tabular disclosure of the disaggregation of investments in and advances to affiliates across legal entities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 6 -Subparagraph (SX 210.12-14) -URI http://asc.fasb.org/extlink&oid=6955306&loc=d3e611322-123010 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 14 -Article 12 + Details
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