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Investments in Unconsolidated Affiliates (Details 3) (USD $) In Millions, except Per Share data | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2011 | Sep. 30, 2010 | Sep. 30, 2011 | Sep. 30, 2010
Changes in carrying value of investment in Symetra |  |  |  |
Carrying value at the beginning of the period |  |  | $ 389.7 |
Equity in earnings of Symetra | (1.5) | (7.9) | (16.1) | (1.6)
Carrying value at the end of the period | 458.6 |  | 458.6 |
Symetra |  |  |  |
Changes in carrying value of investment in Symetra |  |  |  |
Carrying value at the beginning of the period | 421.0 | 372.5 | 387.5 | 307.7
Equity in earnings of Symetra | 1.6 | 8.3 | 17.5 | 2.1
Net unrealized gains from investee's fixed maturity portfolio | 59.9 | 46.9 | 84.0 | 129.7
Dividends received | (1.0) | (0.9) | (2.9) | (1.8)
(Decrease) increase in value of warrants | (24.8) | (10.7) | (29.4) | (21.6)
Carrying value at the end of the period | 456.7 | 416.1 | 456.7 | 416.1
Tax on net unrealized gains from investee's fixed maturity portfolio | 4.8 | 3.8 | 6.8 | 3.8
Aggregate value of White Mountains common shares of Symetra at quoted market price | 141.8 |  | 141.8 |
Quoted market price (in dollars per share) | $ 8.15 |  | $ 8.15 |
Symetra | Common shareholders' equity |  |  |  |
Changes in carrying value of investment in Symetra |  |  |  |
Carrying value at the beginning of the period | 388.5 | 344.9 | 350.4 | 269.2
Equity in earnings of Symetra | 1.6 | 8.3 | 17.5 | 2.1
Net unrealized gains from investee's fixed maturity portfolio | 59.9 | 46.9 | 84.0 | 129.7
Dividends received | (1.0) | (0.9) | (2.9) | (1.8)
Carrying value at the end of the period | 449.0 | 399.2 | 449.0 | 399.2
Tax on equity in earnings | 0.1 | 0.7 | 1.4 | 0.7
Tax on net unrealized gains from investee's fixed maturity portfolio | 4.8 | 3.8 | 6.8 | 3.8
Equity in net unrealized gains | 147.7 | 120.7 | 147.7 | 120.7
Tax on equity in net unrealized gains | 12.3 | 9.8 | 24.2 | 9.8
Loss from dilutive effect resulting from public offering |  |  |  | 17.9
Loss from dilutive effect resulting from dividend and issuance of restricted shares |  | 0.1 |  | 0.7
Gain from dilutive effect resulting from public offering |  |  |  | 1.9
Symetra | Warrants |  |  |  |
Changes in carrying value of investment in Symetra |  |  |  |
Carrying value at the beginning of the period | 32.5 | 27.6 | 37.1 | 38.5
(Decrease) increase in value of warrants | (24.8) | (10.7) | (29.4) | (21.6)
Carrying value at the end of the period | 7.7 | 16.9 | 7.7 | 16.9
Cash dividends received on warrants | $ 0.6 |  | $ 1.6 |

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