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Investments in Unconsolidated Affiliates (Tables) | 6 Months Ended
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Jun. 30, 2014
Equity Method Investments and Joint Ventures [Abstract] |
Investments in and Advances to Affiliates | White Mountains’s 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, 2014 |  | December 31, 2013
Symetra common shares |  | $ | 384.4 |  |  | $ | 360.9 |
Unrealized gains (losses) from Symetra’s fixed maturity portfolio |  | 31.1 |  |  | (43.6 | )
Carrying value of Symetra common shares |  | 415.5 |  |  | 317.3 |
Hamer |  | 3.6 |  |  | 4.1 |
Total investments in unconsolidated affiliates |  | $ | 419.1 |  |  | $ | 321.4 |
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, 2014 and 2013:
|  | Three Months Ended |  | Three Months Ended
|  | June 30, 2014 |  | June 30, 2013
Millions |  | Common Shares |  | Warrants |  | Total |  | Common Shares |  | Warrants |  | Total
Carrying value of investment in Symetra at beginning of period |  | $ | 369.0 |  |  | $ | — |  |  | $ | 369.0 |  |  | $ | 350.9 |  |  | $ | 26.6 |  |  | $ | 377.5 |
Equity in earnings (1)(2) |  | 13.1 |  |  | — |  |  | 13.1 |  |  | 7.2 |  |  | — |  |  | 7.2 |
Equity in net unrealized gains (losses) from Symetra’s fixed maturity portfolio(3) |  | 35.4 |  |  | — |  |  | 35.4 |  |  | (71.8 | ) |  | — |  |  | (71.8 | )
Dividends received |  | (2.0 | ) |  | — |  |  | (2.0 | ) |  | (1.4 | ) |  | — |  |  | (1.4 | )
Increase in value of warrants |  | — |  |  | — |  |  | — |  |  | — |  |  | 14.5 |  |  | 14.5 |
Exercise of warrants |  | — |  |  | — |  |  | — |  |  | 41.1 |  |  | (41.1 | ) |  | — |
Carrying value of investment in Symetra at end of period(4)(5) |  | $ | 415.5 |  |  | $ | — |  |  | $ | 415.5 |  |  | $ | 326.0 |  |  | $ | — |  |  | $ | 326.0 |
(1) Equity in earnings excludes tax expense of $0.9 and $0.6. (2) Equity in earnings includes $0.7 and $0.7 increase relating to the pre-tax amortization of the Symetra common share basis difference. (3) Net unrealized gains includes $3.1 and $2.7 increase relating to the pre-tax amortization of the Symetra common share basis difference. (4) Includes White Mountains’s equity in net unrealized gains (losses) from Symetra’s fixed maturity portfolio of $31.1 and $(17.8) as of June 30, 2014 and 2013, which excludes tax (expense) benefit of $(2.1) and $1.4. (5) The aggregate value of White Mountains’s investment in common shares of Symetra was $455.9 based upon the quoted market price of $22.74 per share at June 30, 2014.
|  | Six Months Ended |  | Six Months Ended
|  | June 30, 2014 |  | June 30, 2013
Millions |  | Common Shares |  | Warrants |  | Total |  | Common Shares |  | Warrants |  | Total
Carrying value of investment in Symetra at beginning of period |  | $ | 317.3 |  |  | $ | — |  |  | $ | 317.3 |  |  | $ | 351.2 |  |  | $ | 30.3 |  |  | $ | 381.5 |
Equity in earnings (1)(2) |  | 27.5 |  |  | — |  |  | 27.5 |  |  | 17.0 |  |  | — |  |  | 17.0 |
Equity in net unrealized gains (losses) from Symetra’s fixed maturity portfolio(3) |  | 74.7 |  |  | — |  |  | 74.7 |  |  | (80.5 | ) |  | — |  |  | (80.5 | )
Dividends received |  | (4.0 | ) |  | — |  |  | (4.0 | ) |  | (2.8 | ) |  | — |  |  | (2.8 | )
Increase in value of warrants |  | — |  |  | — |  |  | — |  |  | — |  |  | 10.8 |  |  | 10.8 |
Exercise of warrants |  | — |  |  | — |  |  | — |  |  | 41.1 |  |  | (41.1 | ) |  | — |
Carrying value of investment in Symetra at end of period(4)(5) |  | $ | 415.5 |  |  | $ | — |  |  | $ | 415.5 |  |  | $ | 326.0 |  |  | $ | — |  |  | $ | 326.0 |
(1) Equity in earnings excludes tax expense of $1.9 and $1.4. (2) Equity in earnings includes $1.5 and $1.5 increase relating to the pre-tax amortization of the Symetra common share basis difference. (3) Net unrealized gains includes $6.3 and $5.5 increase relating to the pre-tax amortization of the Symetra common share basis difference. (4) Includes White Mountains’s equity in net unrealized gains (losses) from Symetra’s fixed maturity portfolio of $31.1 and $(17.8) as of June 30, 2014 and 2013, which excludes tax (expense) benefit of $(2.1) and $1.4. (5) The aggregate value of White Mountains’s investment in common shares of Symetra was $455.9 based upon the quoted market price of $22.74 per share at June 30, 2014.

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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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