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Goodwill and Other Intangible Assets (Details) In Millions, unless otherwise specified | 3 Months Ended |  |  |  | 2 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Mar. 31, 2015 USD ($) | Mar. 31, 2014 USD ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($) | Feb. 23, 2015 Cashboard [Member] Common Stock | Feb. 23, 2015 Common Stock Israel, New Shekels Cashboard [Member] ILS | Feb. 23, 2015 Common Stock United States of America, Dollars Cashboard [Member] USD ($) | Feb. 23, 2015 Cashboard [Member] USD ($)
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |
Ownership interest (as a percent) |  |  |  |  | 56.20%us-gaap_EquityMethodInvestmentOwnershipPercentage / dei_LegalEntityAxis = wtm_CashboardMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember |  |  |
Payments to Acquire Businesses and Interest in Affiliates | $ 2.4 us-gaap_PaymentsToAcquireBusinessesAndInterestInAffiliates | $ 32.2 us-gaap_PaymentsToAcquireBusinessesAndInterestInAffiliates |  |  |  | 9.5 us-gaap_PaymentsToAcquireBusinessesAndInterestInAffiliates / us-gaap_CurrencyAxis = currency_ILS / us-gaap_InvestmentTypeAxis = us-gaap_CommonStockMember / dei_LegalEntityAxis = wtm_CashboardMember | $ 2.4 us-gaap_PaymentsToAcquireBusinessesAndInterestInAffiliates / us-gaap_CurrencyAxis = currency_USD / us-gaap_InvestmentTypeAxis = us-gaap_CommonStockMember / dei_LegalEntityAxis = wtm_CashboardMember |
Assets | 10,507.8 us-gaap_Assets |  | 10,455.7 us-gaap_Assets |  |  |  |  | 5.5 us-gaap_Assets / us-gaap_BusinessAcquisitionAxis = wtm_CashboardMember
Goodwill | 169.2 us-gaap_Goodwill | 23.8 us-gaap_Goodwill | 168.9 us-gaap_Goodwill | 0 us-gaap_Goodwill |  |  |  | 0.3 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = wtm_CashboardMember
Intangible Assets, Net (Excluding Goodwill) | 193.4 us-gaap_IntangibleAssetsNetExcludingGoodwill | 62.4 us-gaap_IntangibleAssetsNetExcludingGoodwill | 197.5 us-gaap_IntangibleAssetsNetExcludingGoodwill | 20.7 us-gaap_IntangibleAssetsNetExcludingGoodwill |  |  |  | 2.8 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_BusinessAcquisitionAxis = wtm_CashboardMember
Liabilities | $ 5,968.0 us-gaap_Liabilities |  | $ 5,917.3 us-gaap_Liabilities |  |  |  |  | $ 1.2 us-gaap_Liabilities / us-gaap_BusinessAcquisitionAxis = wtm_CashboardMember

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- Definition Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.18) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 12 -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 18 -Article 5 + Details
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- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571 + Details
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- Definition Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16212-109274 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph ((a)(1),(b)) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Sum of the carrying amounts as of the balance sheet date of all liabilities that are recognized. Liabilities are probable future sacrifices of economic benefits arising from present obligations of an entity to transfer assets or provide services to other entities in the future. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19-26) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The cash outflow associated with the acquisition of a controlling interest in another entity or an entity that is related to it but not strictly controlled (for example, an unconsolidated subsidiary, affiliate, joint venture or equity method investment). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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