XML 58 R32.htm IDEA: XBRL DOCUMENT
v2.4.0.6

Investments in Unconsolidated Affiliates (Tables) | 9 Months Ended
--- | ---
Sep. 30, 2012
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 |  | September 30, 2012 |  | December 31, 2011
Symetra common shares |  | $ | 284.0 |  |  | $ | 261.0 |
Unrealized gains from Symetra's fixed maturity portfolio |  | 64.6 |  |  | — |
GAAP Carrying value of Symetra common shares |  | 348.6 |  |  | 261.0 |
Symetra warrants |  | 26.2 |  |  | 12.6 |
Total investment in Symetra |  | 374.8 |  |  | 273.6 |
Pentelia Capital Management |  | 1.5 |  |  | 1.7 |
Total investments in unconsolidated affiliates |  | $ | 376.3 |  |  | $ | 275.3 |
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 months ended September 30, 2012 and 2011:
|  | Three Months Ended |  | Three Months Ended
|  | September 30, 2012 |  | September 30, 2011
Millions |  | Common Shares |  | Warrants |  | Total |  | Common Shares |  | Warrants |  | Total
Carrying value of investment in Symetra as of June 30 |  | $ | 305.9 |  |  | $ | 29.8 |  |  | $ | 335.7 |  |  | $ | 388.5 |  |  | $ | 32.5 |  |  | $ | 421.0 |
Equity in earnings (1)(2) |  | 8.8 |  |  | — |  |  | 8.8 |  |  | 1.6 |  |  | — |  |  | 1.6 |
Equity in net unrealized gains from Symetra’s fixed maturity portfolio (3) |  | 35.2 |  |  | — |  |  | 35.2 |  |  | 59.9 |  |  | — |  |  | 59.9 |
Dividends received |  | (1.3 | ) |  | — |  |  | (1.3 | ) |  | (1.0 | ) |  | — |  |  | (1.0 | )
Increase (decrease) in value of warrants |  | — |  |  | (3.6 | ) |  | (3.6 | ) |  | — |  |  | (24.8 | ) |  | (24.8 | )
Carrying value of investment in Symetra as September 30(4)(5) |  | $ | 348.6 |  |  | $ | 26.2 |  |  | $ | 374.8 |  |  | $ | 449.0 |  |  | $ | 7.7 |  |  | $ | 456.7 |
(1) Equity in earnings excludes tax expense of $0.7 and $0.1. (2) Equity in earnings includes $0.9 increase relating to the pre-tax amortization of Symetra common share impairment from September 30, 2012 (3) Net unrealized gains includes $3.3 increase relating to the pre-tax amortization of Symetra common share impairment from September 30, 2012. (4) Includes White Mountains’ equity in net unrealized gains from Symetra’s fixed maturity portfolio of $35.2 and $147.7 as of September 30, 2012 and 2011, which exclude tax expense of $2.8 and $12.3. (5) The aggregate value of White Mountains’ investment in common shares of Symetra was $214.0 based upon the quoted market price of $12.30 per share at September 30, 2012. The following table summarizes amounts recorded by White Mountains relating to its investment in Symetra for the nine months ended September 30, 2012 and 2011:
|  | Nine Months Ended |  | Nine Months Ended
|  | September 30, 2012 |  | September 30, 2011
Millions |  | Common Shares |  | Warrants |  | Total |  | Common Shares |  | Warrants |  | Total
Carrying value of investment in Symetra as of January 1 |  | $ | 261.0 |  |  | $ | 12.6 |  |  | $ | 273.6 |  |  | $ | 350.4 |  |  | $ | 37.1 |  |  | $ | 387.5 |
Equity in earnings (1)(2) |  | 26.7 |  |  | — |  |  | 26.7 |  |  | 17.5 |  |  | — |  |  | 17.5 |
Equity in net unrealized gains from Symetra’s fixed maturity portfolio(3) |  | 64.6 |  |  | — |  |  | 64.6 |  |  | 84.0 |  |  | — |  |  | 84.0 |
Dividends received |  | (3.7 | ) |  | — |  |  | (3.7 | ) |  | (2.9 | ) |  | — |  |  | (2.9 | )
Increase (decrease) in value of warrants |  | — |  |  | 13.6 |  |  | 13.6 |  |  | — |  |  | (29.4 | ) |  | (29.4 | )
Carrying value of investment in Symetra as September 30 (4)(5) |  | $ | 348.6 |  |  | $ | 26.2 |  |  | $ | 374.8 |  |  | $ | 449.0 |  |  | $ | 7.7 |  |  | $ | 456.7 |
(1) Equity in earnings excludes tax expense of $2.2 and $1.4. (2) Equity in earnings includes $0.9 increase relating to the pre-tax amortization of Symetra common share impairment from September 30, 2012. (3) Net unrealized gains includes $9.9 increase relating to the pre-tax amortization of Symetra common share impairment from September 30, 2012. (4) Includes White Mountains’ equity in net unrealized gains from Symetra’s fixed maturity portfolio of $64.6 and $147.7 as of September 30, 2012 and 2011, which exclude tax expense of $5.2 and $24.2. (5) The aggregate value of White Mountains’ investment in common shares of Symetra was $214.0 based upon the quoted market price of $12.30 per share at September 30, 2012. D

X
- Details
Name: | us-gaap_EquityMethodInvestmentsAndJointVenturesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- 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
Name: | us-gaap_InvestmentsInAndAdvancesToAffiliatesTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Disclosure of changes in the investment in unconsolidated affiliates. + References No definition available. + Details
Name: | wtm_ScheduleOfChangesInInvestmentsInUnconsolidatedAffiliatesTableTextBlock
Namespace Prefix: | wtm_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration