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Investments in Unconsolidated Affiliates (Tables) | 12 Months Ended
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Dec. 31, 2015
Investments in and Advances to Affiliates [Line Items] |
Schedule of investments in unconsolidated 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.
|  | November 5, |  | December 31,
Millions |  | 2015 |  | 2014
Symetra common shares |  | $ | 394.4 |  |  | $ | 373.8 |
Unrealized (losses) gains from Symetra’s fixed maturity portfolio |  | (1.6 | ) |  | 37.6 |
Carrying value of Symetra common shares |  | 392.8 |  |  | 411.4 |
Hamer |  | — |  |  | 3.0 |
Total investments in unconsolidated affiliates |  | $ | 392.8 |  |  | $ | 414.4 |
Schedule of changes in unconsolidated affiliates | The following table summarizes amounts recorded by White Mountains under the equity method relating to its investment in Symetra through November 5, 2015:
Millions |  | Common shares |  | Warrants |  | Total
Equity method carrying value of investment in Symetra as of December 31, 2012(2) |  | $ | 351.2 |  |  | $ | 30.3 |  |  | $ | 381.5 |
Equity in earnings(1)(3)(6) |  | 37.8 |  |  | — |  |  | 37.8 |
Equity in net unrealized gains from Symetra’s fixed maturity portfolio(4)(5) |  | (106.4 | ) |  | — |  |  | (106.4 | )
Dividends received |  | (6.4 | ) |  | — |  |  | (6.4 | )
Increase in value of warrants |  | — |  |  | 10.8 |  |  | 10.8 |
Exercise of warrants |  | 41.1 |  |  | (41.1 | ) |  | — |
Equity method carrying value of investment in Symetra as of December 31, 2013(2) |  | 317.3 |  |  | — |  |  | 317.3 |
Equity in earnings(1)(3)(6) |  | 47.0 |  |  | — |  |  | 47.0 |
Equity in net unrealized losses from Symetra’s fixed maturity portfolio(4)(5) |  | 81.2 |  |  | — |  |  | 81.2 |
Dividends received |  | (34.1 | ) |  | — |  |  | (34.1 | )
Equity method carrying value of investment in Symetra as of December 31, 2014(2) |  | 411.4 |  |  | — |  |  | 411.4 |
Equity in earnings(1)(3)(6) |  | 25.1 |  |  | — |  |  | 25.1 |
Equity in net unrealized gains from Symetra’s fixed maturity portfolio(4)(5) |  | (39.2 | ) |  | — |  |  | (39.2 | )
Distribution from Prospector Offshore Fund |  | 12.4 |  |  | — |  |  | 12.4 |
Dividends received |  | (16.9 | ) |  | — |  |  | (16.9 | )
Equity method carrying value of investment in Symetra as of November 5, 2015(2)(7) |  | $ | 392.8 |  |  | $ | — |  |  | $ | 392.8 |
(1) | Equity in earnings for the period ended November 5, 2015 and years ended December 31, 2014 and 2013 excludes tax expense of $1.6, $3.3, and $2.8
(2) | Includes White Mountains’s equity in net unrealized gains (losses) from Symetra’s fixed maturity portfolio of $(1.6), $37.6, and $(43.6) as of November 5, 2015 and December 31, 2014 and 2013, which excludes tax benefit (expense) of $0.2, $(2.7) and $3.2
(3) | Equity in earnings for the period ended November 5, 2015 and years ended December 31, 2014 and 2013 includes $2.3, $3.0 and $3.0 increases relating to the pre-tax amortization of the Symetra common share basis difference.
(4) | Net unrealized gains for the period ended November 5, 2015 and years ended December 31, 2014 and 2013 includes $9.4, $12.7 and $11.8 increases relating to the pre-tax amortization of the Symetra common share basis difference.
(5) | Net unrealized gains (losses) from Symetra’s fixed maturity portfolio excludes tax benefit (expense) of $2.9, $(5.9) and $8.3 for the period ended November 5, 2015 and years ended December 31, 2014 and 2013.
(6) | Equity in earnings for the period ended November 5, 2015 and years ended December 31, 2014 and 2013 includes $(0.1), $(0.1), and $0.2 (gain) loss from the dilutive effect of Symetra’s yearly dividend and the issuance of restricted shares by Symetra
(7) | The aggregate value of White Mountains’s investment in common shares of Symetra was $651.2 based upon the quoted market price of $31.67 per share as of November 5, 2015.
Symetra |
Investments in and Advances to Affiliates [Line Items] |
Summarized statement of financial position of Symetra | The following table summarizes financial information for Symetra as of September 30, 2015 and December 31, 2014:
|  | September 30, |  | December 31,
Millions |  | 2015 |  | 2014
Symetra balance sheet data: |  |  |  |  |  |
Total investments |  | $ | 32,409.2 |  |  | $ | 30,634.3 |
Separate account assets |  | 885.9 |  |  | 949.8 |
Total assets |  | 34,962.8 |  |  | 33,001.7 |
Policyholder liabilities |  | 29,492.0 |  |  | 27,276.0 |
Long-term debt |  | 697.5 |  |  | 697.2 |
Separate account liabilities |  | 885.9 |  |  | 949.8 |
Total liabilities |  | 31,836.7 |  |  | 29,641.1 |
Common shareholders’ equity |  | 3,126.1 |  |  | 3,360.6 |
The following table summarizes financial information for Symetra for the nine months ended September 30, 2015 and years ended December 31, 2014 and 2013:
|  | Nine months ended September 30, |  | Year ended December 31,
Millions |  | 2015 |  | 2014 |  | 2013
Symetra income statement data: |  |  |  |  |  |
Net premiums earned |  | $ | 539.3 |  |  | $ | 629.1 |  |  | $ | 627.2 |
Net investment income |  | 994.3 |  |  | 1,320.5 |  |  | 1,285.0 |
Total revenues |  | 1,605.9 |  |  | 2,182.4 |  |  | 2,139.5 |
Policy benefits |  | 1,143.7 |  |  | 1,399.7 |  |  | 1,394.9 |
Total expenses |  | 1,543.6 |  |  | 1,882.5 |  |  | 1,865.4 |
Net income |  | 89.6 |  |  | 254.4 |  |  | 220.7 |
Comprehensive net (loss) income |  | (234.1 | ) |  | 397.0 |  |  | (777.6 | )

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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=50485924&loc=d3e611322-123010 + Details
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