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Investments in Unconsolidated Affiliates (Tables) | 6 Months Ended
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Jun. 30, 2013
Equity Method Investments and Joint Ventures [Abstract] |
Investments in and Advances to 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.
Millions |  | June 30, 2013 |  | December 31, 2012
Symetra common shares |  | $ | 343.8 |  |  | $ | 288.4 |
Unrealized gains from Symetra's fixed maturity portfolio |  | (17.8 | ) |  | 62.8 |
Carrying value of Symetra common shares |  | 326.0 |  |  | 351.2 |
Symetra warrants |  | — |  |  | 30.3 |
Total investment in Symetra |  | 326.0 |  |  | 381.5 |
Hamer |  | 3.5 |  |  | 4.0 |
Bri-Mar |  | 2.4 |  |  | 1.9 |
Pentelia Capital Management |  | — |  |  | .5 |
Total investments in unconsolidated affiliates |  | $ | 331.9 |  |  | $ | 387.9 |
Schedule of Changes in Investments in Unconsolidated Affiliates | The following table summarizes amounts recorded by White Mountains relating to its investment in Symetra for the three and six months ended June 30, 2013 and 2012:
|  | Three Months Ended |  | Three Months Ended
|  | June 30, 2013 |  | June 30, 2012
Millions |  | Common Shares |  | Warrants |  | Total |  | Common Shares |  | Warrants |  | Total
Carrying value of investment in Symetra as of March 31 |  | $ | 350.9 |  |  | $ | 26.6 |  |  | $ | 377.5 |  |  | $ | 269.5 |  |  | $ | 23.7 |  |  | $ | 293.2 |
Equity in earnings (1)(2) |  | 7.2 |  |  | — |  |  | 7.2 |  |  | 7.0 |  |  | — |  |  | 7.0 |
Equity in net unrealized gains from Symetra’s fixed maturity portfolio(3) |  | (71.8 | ) |  | — |  |  | (71.8 | ) |  | 30.6 |  |  | — |  |  | 30.6 |
Dividends received |  | (1.4 | ) |  | — |  |  | (1.4 | ) |  | (1.2 | ) |  | — |  |  | (1.2 | )
Increase in value of warrants |  | — |  |  | 14.5 |  |  | 14.5 |  |  | — |  |  | 6.1 |  |  | 6.1 |
Exercise of warrants |  | 41.1 |  |  | (41.1 | ) |  | — |  |  | — |  |  | — |  |  | — |
Carrying value of investment in Symetra as June(4)(5) |  | $ | 326.0 |  |  | $ | — |  |  | $ | 326.0 |  |  | $ | 305.9 |  |  | $ | 29.8 |  |  | $ | 335.7 |
(1) Equity in earnings excludes tax expense of $0.6 and $0.6. (2) Equity in earnings includes $0.8 and $0.7 increase relating to the pre-tax amortization of the Symetra common share impairment. (3) Net unrealized gains includes $2.8 and $3.3 increase relating to the pre-tax amortization of the Symetra common share impairment. (4) Includes White Mountains’ equity in net unrealized (losses) gains from Symetra’s fixed maturity portfolio of $(17.8) and $29.4 as of June 30, 2013 and 2012, which exclude deferred tax assets (liabilities) of $1.4 and $(2.4). (5) The aggregate value of White Mountains’ investment in common shares of Symetra was $320.6 based upon the quoted market price of $15.99 per share at June 30, 2013.
|  | Six Months Ended |  | Six Months Ended
|  | June 30, 2013 |  | June 30, 2012
Millions |  | Common Shares |  | Warrants |  | Total |  | Common Shares |  | Warrants |  | Total
Carrying value of investment in Symetra as of January 1 |  | $ | 351.2 |  |  | $ | 30.3 |  |  | $ | 381.5 |  |  | $ | 261.0 |  |  | $ | 12.6 |  |  | $ | 273.6 |
Equity in earnings (1)(2) |  | 17.0 |  |  | — |  |  | 17.0 |  |  | 17.9 |  |  | — |  |  | 17.9 |
Equity in net unrealized gains from Symetra’s fixed maturity portfolio(3) |  | (80.5 | ) |  | — |  |  | (80.5 | ) |  | 29.4 |  |  | — |  |  | 29.4 |
Dividends received |  | (2.8 | ) |  | — |  |  | (2.8 | ) |  | (2.4 | ) |  | — |  |  | (2.4 | )
Increase in value of warrants |  | — |  |  | 10.8 |  |  | 10.8 |  |  | — |  |  | 17.2 |  |  | 17.2 |
Exercise of warrants |  | 41.1 |  |  | (41.1 | ) |  | — |  |  | — |  |  | — |  |  | — |
Carrying value of investment in Symetra as June 30(4)(5) |  | $ | 326.0 |  |  | $ | — |  |  | $ | 326.0 |  |  | $ | 305.9 |  |  | $ | 29.8 |  |  | $ | 335.7 |
(1) Equity in earnings excludes tax expense of $1.4 and $1.5. (2) Equity in earnings includes $1.5 and $1.8 increase relating to the pre-tax amortization of the Symetra common share impairment. (3) Net unrealized gains includes $5.5 and $6.6 increase relating to the pre-tax amortization of the Symetra common share impairment. (4) Includes White Mountains’ equity in net unrealized gains from Symetra’s fixed maturity portfolio of $(17.8) and $29.4 as of June 30, 2013 and 2012, which exclude deferred tax assets (liabilities) of $1.4 and $(2.4). (5) The aggregate value of White Mountains’ investment in common shares of Symetra was $320.6 based upon the quoted market price of $15.99 per share at June 30, 2013.

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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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