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Discontinued Operations (Loss from Discontinued Operations) (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended
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Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2012 Discontinued Operations | Dec. 31, 2011 Discontinued Operations | Dec. 31, 2010 Discontinued Operations | Oct. 31, 2011 Esurance | Dec. 31, 2012 Esurance | Dec. 31, 2011 Esurance | Dec. 31, 2010 Esurance | Dec. 31, 2012 Esurance Discontinued Operations | Dec. 31, 2011 Esurance Discontinued Operations | Dec. 31, 2010 Esurance Discontinued Operations | Dec. 31, 2012 AutoOne Discontinued Operations | Dec. 31, 2011 AutoOne Discontinued Operations
Revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earned insurance premiums |  |  |  |  |  |  |  |  | $ 2,063.6 | $ 1,924.5 | $ 2,029.0 | $ 10.6 | $ 731.2 | $ 1,133.4 |  |  |  |  |  |  |  |  |
Net investment income |  |  |  |  |  |  |  |  | 153.6 | 184.5 | 208.9 | 0 | 12.0 | 19.6 |  |  |  |  |  |  |  |  |
Net realized and unrealized investment gains |  |  |  |  |  |  |  |  | 118.2 | 74.1 | 77.6 | 0 | 0.7 | 13.3 |  |  |  |  |  |  |  |  |
Other revenue |  |  |  |  |  |  |  |  | 100.3 | (10.0) | 18.2 | 0 | 55.1 | 71.1 |  |  |  |  |  |  |  |  |
Revenues (including realized gains and losses) | 566.4 | 697.4 | 542.3 | 629.7 | 593.4 | 501.7 | 552.4 | 525.6 | 2,435.7 | 2,173.1 | 2,333.7 | 10.6 | 799.0 | 1,237.4 |  |  |  |  |  |  |  |  |
Expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss and loss adjustment expenses |  |  |  |  |  |  |  |  | 1,193.9 | 1,174.3 | 1,216.6 | 48.4 | 574.9 | 851.4 |  |  |  |  |  |  |  |  |
Insurance and reinsurance acquisition expenses |  |  |  |  |  |  |  |  | 430.2 | 402.2 | 419.6 | (2.1) | 157.0 | 251.2 |  |  |  |  |  |  |  |  |
Other underwriting expenses |  |  |  |  |  |  |  |  | 321.8 | 268.1 | 295.9 | 1.7 | 91.4 | 124.9 |  |  |  |  |  |  |  |  |
General and administrative expenses |  |  |  |  |  |  |  |  | 182.2 | 175.3 | 155.0 | 0 | 38.3 | 48.7 |  |  |  |  |  |  |  |  |
Total expenses | 617.2 | 562.3 | 504.7 | 488.8 | 495.0 | 500.5 | 516.6 | 563.0 | 2,172.9 | 2,075.1 | 2,144.4 | 48.0 | 861.6 | 1,276.2 |  |  |  |  |  |  |  |  |
Loss from discontinued operations |  |  |  |  |  |  |  |  |  |  |  | (37.4) | (62.6) | (38.8) |  |  |  |  |  |  |  |  |
Income tax benefit |  |  |  |  |  |  |  |  |  |  |  | 13.4 | 25.9 | 8.7 |  |  |  |  |  |  |  |  |
Net loss from other discontinued operations, net of tax | 0.5 | (106.8) | 0.5 | (9.2) | 647.6 | (30.1) | (2.4) | 6.5 | (24.0) | (36.7) | (30.1) | (24.0) | (36.7) | (30.1) |  |  |  |  |  |  |  |  |
Gain (loss) on sale of discontinued operation, net of tax |  |  |  |  |  |  |  |  |  |  |  | (91.0) | (19.2) | 0 | 677.5 | 0 | 677.5 | 0 | 0 | 677.5 | 0 | 0.5 | (19.2)
Net (loss) income from discontinued operations |  |  |  |  |  |  |  |  |  |  |  | $ (115.0) | $ 621.6 | $ (30.1) |  |  |  |  |  |  |  |  |

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- Definition This item represents the net total realized and unrealized gain (loss) included in earnings for the period as a result of selling or holding marketable securities categorized as trading, available-for-sale, or held-to-maturity, including the unrealized holding gain (loss) of held-to-maturity securities transferred to the trading security category and the cumulative unrealized gain (loss) which was included in other comprehensive income (a separate component of shareholders' equity) for available-for-sale securities transferred to trading securities during the period. Additionally, this item would include any gains (losses) realized during the period from the sale of investments accounted for under the cost method of accounting and losses recognized for other than temporary impairments (OTTI) of the subject investments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.7(c),9(a)) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (c)-(e) -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27357-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27405-111563 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Article 5 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 13, 22 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Amount of policy acquisition costs charged to expense in the period. Includes deferred policy acquisition costs amortized in the period, generally in proportion to related revenue earned over the policy or contract term. + References No definition available. + Details
Name: | wtm_InsuranceAndReinsuranceAcquisitionExpenses
Namespace Prefix: | wtm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration