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Investments in Unconsolidated Affiliates (Details 4) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended |  | 1 Months Ended | 3 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2010 | Sep. 30, 2010 | Jun. 30, 2010 | Mar. 31, 2010 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009 | Dec. 31, 2011 Symetra | Dec. 31, 2010 Symetra | Dec. 31, 2009 Symetra | Dec. 31, 2008 Symetra | Aug. 31, 2006 Delos | Sep. 30, 2010 Delos | Dec. 31, 2010 Delos | Apr. 30, 2007 Pentelia Capital Management | Dec. 31, 2011 Pentelia Capital Management | Dec. 31, 2010 Pentelia Capital Management | Dec. 31, 2009 Pentelia Capital Management
Summarized financial information |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total investments |  |  |  |  |  |  |  |  |  |  |  | $ 26,171.7 | $ 23,500.2 |  |  |  |  |  |  |  |  |
Separate account assets |  |  |  |  |  |  |  |  |  |  |  | 795.8 | 881.7 |  |  |  |  |  |  |  |  |
Total assets |  |  |  |  |  |  |  |  |  |  |  | 28,212.7 | 25,636.9 |  |  |  |  |  |  |  |  |
Policyholder liabilities |  |  |  |  |  |  |  |  |  |  |  | 23,140.6 | 21,591.5 |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  |  |  |  | 449.2 | 449.0 |  |  |  |  |  |  |  |  |
Separate account liabilities |  |  |  |  |  |  |  |  |  |  |  | 795.8 | 881.7 |  |  |  |  |  |  |  |  |
Total liabilities |  |  |  |  |  |  |  |  |  |  |  | 25,078.7 | 23,256.3 |  |  |  |  |  |  |  |  |
Common shareholders equity |  |  |  |  |  |  |  |  |  |  |  | 3,134.0 | 2,380.6 |  |  |  |  |  |  |  |  |
Symetra income statement data |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net premiums earned |  |  |  |  |  |  |  |  |  |  |  | 540.5 | 473.0 | 470.1 |  |  |  |  |  |  |  |
Net investment income |  |  |  |  |  |  |  |  |  |  |  | 1,270.9 | 1,199.4 | 1,113.6 |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  |  |  |  | 1,999.0 | 1,878.5 | 1,714.3 |  |  |  |  |  |  |  |
Policy benefits |  |  |  |  |  |  |  |  |  |  |  | 1,307.3 | 1,234.6 | 1,197.3 |  |  |  |  |  |  |  |
Total expenses |  |  |  |  |  |  |  |  |  |  |  | 1,720.0 | 1,589.4 | 1,533.2 |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  |  |  |  | 199.6 | 200.9 | 128.3 |  |  |  |  |  |  |  |
Comprehensive net income |  |  |  |  |  |  |  |  |  |  |  | 780.6 | 683.1 | 1,018.6 |  |  |  |  |  |  |  |
Ownership interest (as a percent) |  |  |  |  |  |  |  |  |  |  |  | 15.00% |  |  |  |  | 18.00% |  | 33.00% |  |  |
Amount of investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 32.0 |  | 1.6 |  |  |
Equity in earnings | (36.3) | 1.5 | 7.9 | 6.7 | 8.3 | 7.9 | 5.3 | (11.6) | (20.2) | 9.9 | 24.3 | 28.2 | 11.1 | 23.9 |  |  |  |  |  | (0.2) | 0.5 | 0.1
Equity method investments | 275.3 |  |  |  | 389.7 |  |  |  | 275.3 | 389.7 |  | 273.6 | 387.5 | 307.7 | 81.3 |  |  |  |  | 1.7 | 2.2 |
Sale of investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 138.8 |  | 21.7 |  |  |  |
Pre-tax gain (loss) in other revenue |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (14.0) |  | 10.9 |  |  |  |
Pre-tax unrealized gains (losses) |  |  |  |  |  |  |  |  |  |  |  |  | $ 63.7 | $ (9.0) |  |  |  |  |  |  |  |

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- Definition The amount of the total expenses reported by an equity method investment of the entity. + References No definition available. + Details
Name: | wtm_EquityMethodInvestmentSummarizedFinancialInformationTotalExpenses
Namespace Prefix: | wtm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Total investments in (A) companies that are accounted for using the equity method and (B) warrants to acquire additional shares of an unconsolidated affiliate that are carried at fair value. + References No definition available. + Details
Name: | wtm_InvestmentsInUnconsolidatedAffiliates
Namespace Prefix: | wtm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant