XML 148 R137.htm IDEA: XBRL DOCUMENT
v2.4.0.8

Segment Information (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Segment reporting information |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earned insurance and reinsurance premiums |  |  |  |  |  |  |  |  | $ 1,987.3 |  | $ 2,063.6 |  | $ 1,924.5 |
Net investment income |  |  |  |  |  |  |  |  | 110.9 |  | 153.6 |  | 184.5 |
Net investment income (loss) - surplus note interest |  |  |  |  |  |  |  |  | 0 |  | 0 |  |  |
Net realized and unrealized investment gains |  |  |  |  |  |  |  |  | 161.7 |  | 118.2 |  | 74.1 |
Other revenue |  |  |  |  |  |  |  |  | 57.5 |  | 100.3 |  | (10.0) |
Total revenues | 626.6 | 574.1 | 489.3 | 627.4 | 566.4 | 697.4 | 542.3 | 629.7 | 2,317.4 |  | 2,435.7 |  | 2,173.1 |
Loss and loss adjustment expenses |  |  |  |  |  |  |  |  | 1,040.5 |  | 1,193.9 |  | 1,174.3 |
Insurance and reinsurance acquisition expenses |  |  |  |  |  |  |  |  | 376.9 |  | 430.2 |  | 402.2 |
Other underwriting expenses |  |  |  |  |  |  |  |  | 331.3 |  | 321.8 |  | 268.1 |
General and administrative expenses |  |  |  |  |  |  |  |  | 181.3 |  | 182.2 |  | 175.3 |
Interest expense on debt |  |  |  |  |  |  |  |  | 42.5 |  | 44.8 |  | 55.2 |
Total expenses | 492.4 | 518.8 | 485.7 | 475.6 | 617.2 | 562.3 | 504.7 | 488.8 | 1,972.5 |  | 2,172.9 |  | 2,075.1 |
Pre-tax income | 134.2 | 55.3 | 3.6 | 151.8 | (50.8) | 135.1 | 37.6 | 140.9 | 344.9 |  | 262.8 |  | 98.0 |
Percentage of par value of policy reinsured |  |  |  |  | 15.00% |  |  |  |  |  | 15.00% |  |  |
Sirius Group Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment reporting information |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earned insurance and reinsurance premiums |  |  |  |  |  |  |  |  | 866.4 |  | 931.6 |  | 912.3 |
Pre-tax income |  |  |  |  |  |  |  |  |  |  | 171.3 |  |  |
OneBeacon |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment reporting information |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earned insurance and reinsurance premiums |  |  |  |  |  |  |  |  | 1,120.4 | [1] | 1,132.0 | [1] | 1,012.2 | [1]
Net investment income |  |  |  |  |  |  |  |  | 41.1 |  | 53.6 |  | 71.4 |
Net investment income (loss) - surplus note interest |  |  |  |  |  |  |  |  | 0 |  | 0 |  |  |
Net realized and unrealized investment gains |  |  |  |  |  |  |  |  | 49.4 |  | 55.7 |  | 10.6 |
Other revenue |  |  |  |  |  |  |  |  | 31.2 |  | (0.5) |  | (12.4) |
Total revenues |  |  |  |  |  |  |  |  | 1,242.1 |  | 1,240.8 |  | 1,081.8 |
Loss and loss adjustment expenses |  |  |  |  |  |  |  |  | 622.1 |  | 650.0 |  | 548.3 |
Insurance and reinsurance acquisition expenses |  |  |  |  |  |  |  |  | 208.9 |  | 249.4 |  | 221.2 |
Other underwriting expenses |  |  |  |  |  |  |  |  | 204.8 |  | 205.2 |  | 162.3 |
General and administrative expenses |  |  |  |  |  |  |  |  | 12.0 |  | 13.4 |  | 9.8 |
Interest expense on debt |  |  |  |  |  |  |  |  | 13.0 |  | 16.9 |  | 20.5 |
Total expenses |  |  |  |  |  |  |  |  | 1,060.8 |  | 1,134.9 |  | 962.1 |
Pre-tax income |  |  |  |  |  |  |  |  | 181.3 |  | 105.9 |  | 119.7 |
Sirius Group |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment reporting information |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earned insurance and reinsurance premiums |  |  |  |  |  |  |  |  | 866.4 |  | 931.6 |  | 912.3 |
Net investment income |  |  |  |  |  |  |  |  | 48.8 |  | 65.0 |  | 89.9 |
Net investment income (loss) - surplus note interest |  |  |  |  |  |  |  |  | 0 |  | 0 |  |  |
Net realized and unrealized investment gains |  |  |  |  |  |  |  |  | 26.7 |  | 17.3 |  | 53.2 |
Other revenue |  |  |  |  |  |  |  |  | 16.8 |  | 70.6 |  | 4.1 |
Total revenues |  |  |  |  |  |  |  |  | 958.7 |  | 1,084.5 |  | 1,059.5 |
Loss and loss adjustment expenses |  |  |  |  |  |  |  |  | 418.4 |  | 543.9 |  | 626.0 |
Insurance and reinsurance acquisition expenses |  |  |  |  |  |  |  |  | 166.5 |  | 180.8 |  | 181.0 |
Other underwriting expenses |  |  |  |  |  |  |  |  | 126.1 |  | 116.4 |  | 105.8 |
General and administrative expenses |  |  |  |  |  |  |  |  | 32.2 |  | 45.9 |  | 34.1 |
Interest expense on debt |  |  |  |  |  |  |  |  | 26.3 |  | 26.2 |  | 31.6 |
Total expenses |  |  |  |  |  |  |  |  | 769.5 |  | 913.2 |  | 978.5 |
Pre-tax income |  |  |  |  |  |  |  |  | 189.2 |  |  |  | 81.0 |
BAM |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment reporting information |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earned insurance and reinsurance premiums |  |  |  |  |  |  |  |  | 0.1 | [2] | 0 |  |  |
Net investment income |  |  |  |  |  |  |  |  | 4.7 | [2] | 1.9 | [2] |  |
Interest income (expense), surplus notes |  |  |  |  |  |  |  |  | (40.2) | [2] | (18.4) | [2] |  |
Net realized and unrealized investment gains |  |  |  |  |  |  |  |  | (9.3) | [2] | 0 | [2] |  |
Other revenue |  |  |  |  |  |  |  |  | 0.4 | [2] | 0 | [2] |  |
Total revenues |  |  |  |  |  |  |  |  | (44.3) | [2] | (16.5) | [2] |  |
Loss and loss adjustment expenses |  |  |  |  |  |  |  |  | 0 | [2] | 0 | [2] |  |
Insurance and reinsurance acquisition expenses |  |  |  |  |  |  |  |  | 1.4 | [2] | 0 | [2] |  |
Other underwriting expenses |  |  |  |  |  |  |  |  | 0.4 | [2] | 0.2 | [2] |  |
General and administrative expenses |  |  |  |  |  |  |  |  | 32.5 | [2] | 19.6 | [2] |  |
Interest expense on debt |  |  |  |  |  |  |  |  | 0 | [2] | 0 | [2] |  |
Total expenses |  |  |  |  |  |  |  |  | 34.3 | [2] | 19.8 | [2] |  |
HG Global |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment reporting information |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earned insurance and reinsurance premiums |  |  |  |  |  |  |  |  | 0.4 |  | 0 |  |  |
Net investment income |  |  |  |  |  |  |  |  | 1.0 |  | 0.3 |  |  |
Net investment income (loss) - surplus note interest |  |  |  |  |  |  |  |  | 40.2 |  | 18.4 |  |  |
Net realized and unrealized investment gains |  |  |  |  |  |  |  |  | (2.0) |  | 0 |  |  |
Other revenue |  |  |  |  |  |  |  |  | 0 |  | 0 |  |  |
Total revenues |  |  |  |  |  |  |  |  | 39.6 |  | 18.7 |  |  |
Loss and loss adjustment expenses |  |  |  |  |  |  |  |  | 0 |  | 0 |  |  |
Insurance and reinsurance acquisition expenses |  |  |  |  |  |  |  |  | 0.1 |  | 0 |  |  |
Other underwriting expenses |  |  |  |  |  |  |  |  | 0 |  | 0 |  |  |
General and administrative expenses |  |  |  |  |  |  |  |  | 1.4 |  | 4.5 |  |  |
Interest expense on debt |  |  |  |  |  |  |  |  | 0 |  | 0 |  |  |
Total expenses |  |  |  |  |  |  |  |  | 1.5 |  | 4.5 |  |  |
Pre-tax income |  |  |  |  |  |  |  |  | 38.1 |  | 14.2 |  |  |
Percentage of par value of policy reinsured | 15.00% |  |  |  |  |  |  |  | 15.00% |  |  |  |  |
Other Operations |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment reporting information |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earned insurance and reinsurance premiums |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0 |
Net investment income |  |  |  |  |  |  |  |  | 15.3 |  | 32.8 |  | 23.2 |
Net investment income (loss) - surplus note interest |  |  |  |  |  |  |  |  | 0 |  | 0 |  |  |
Net realized and unrealized investment gains |  |  |  |  |  |  |  |  | 96.9 |  | 45.2 |  | 10.3 |
Other revenue |  |  |  |  |  |  |  |  | 9.1 |  | 30.2 |  | (1.7) |
Total revenues |  |  |  |  |  |  |  |  | 121.3 |  | 108.2 |  | 31.8 |
Loss and loss adjustment expenses |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0 |
Insurance and reinsurance acquisition expenses |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0 |
Other underwriting expenses |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0 |
General and administrative expenses |  |  |  |  |  |  |  |  | 103.2 |  | 98.8 |  | 131.4 |
Interest expense on debt |  |  |  |  |  |  |  |  | 3.2 |  | 1.7 |  | 3.1 |
Total expenses |  |  |  |  |  |  |  |  | 106.4 |  | 100.5 |  | 134.5 |
Pre-tax income |  |  |  |  |  |  |  |  | 14.9 |  | 7.7 |  | (102.7) |
Non-controlling Interests | BAM |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment reporting information |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pre-tax income |  |  |  |  |  |  |  |  | $ (78.6) | [2] | $ (36.3) | [2] |  |
[1] | The amounts shown excludes balances reclassified to held for sale in the consolidated balance sheets related to the Runoff Transaction as of December 31, 2013 and 2012 and to AutoOne as of December 31, 2011. See Note 21 - “Discontinued Operations”.
[2] | BAM manages its affairs on a statutory accounting basis. BAM’s statutory surplus includes surplus notes and is not reduced by accruals of interest expense on the surplus notes. BAM’s statutory surplus is reduced only after a payment of principal or interest has been approved by the New York Department of Financial Services.

X
- Definition The total amount of expense recognized during the period for future policy benefits, claims and claims adjustment costs, and for selling, general and administrative costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.5,6,7) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 5, 6, 7 -Article 7 + Details
Name: | us-gaap_BenefitsLossesAndExpenses
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- 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 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: 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=26872669&loc=d3e20235-122688 Reference 3: 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=27724398&loc=d3e27405-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Article 5 Reference 5: 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=27724398&loc=d3e27357-111563 + Details
Name: | us-gaap_GainLossOnInvestments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The aggregate total of expenses of managing and administering the affairs of an entity, including affiliates of the reporting entity, which are not directly or indirectly associated with the manufacture, sale or creation of a product or product line. + 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 210.5-03.4) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
Name: | us-gaap_GeneralAndAdministrativeExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Sum of operating profit and nonoperating income or expense before Income or Loss from equity method investments, income taxes, extraordinary items, and noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(1)(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
Name: | us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of the cost of borrowed funds accounted for as interest expense for debt. + 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 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 8 -Article 5 + Details
Name: | us-gaap_InterestExpenseDebt
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount, after investment expense, of income earned from investments in securities and real estate. Includes, but is not limited to, real estate investment, policy loans, dividends, and interest. Excludes realized gain (loss) on investments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 16 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.2) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 2 -Article 7 + Details
Name: | us-gaap_NetInvestmentIncome
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Reflects the sum of all other revenue and income recognized by the entity in the period not otherwise specified in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.4) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 4 -Article 7 + Details
Name: | us-gaap_OtherIncome
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Costs incurred during the period, such as those relating to general administration and policy maintenance that do not vary with and are not primarily related to the acquisition or renewal of insurance contracts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 7 -Article 7 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.7) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 720 -Section 25 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6968134&loc=d3e28434-158551 + Details
Name: | us-gaap_OtherUnderwritingExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount, after effects of policies assumed or ceded, of expense related to the provision for policy benefits and costs incurred. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.5) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 5 -Article 7 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6480758&loc=d3e6811-158387 + Details
Name: | us-gaap_PolicyholderBenefitsAndClaimsIncurredNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount, after premiums ceded to other entities and premiums assumed by the entity, of premiums earned. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 17 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 2 -Subparagraph (SX 210.12-17) -URI http://asc.fasb.org/extlink&oid=6588446&loc=d3e574992-122915 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.1) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 1 -Article 7 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 605 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.13(c)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
Name: | us-gaap_PremiumsEarnedNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + 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 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
Name: | us-gaap_Revenues
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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

X
- 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

X
- Definition Interest income (expense) earned from surplus notes. + References No definition available. + Details
Name: | wtm_InterestIncomeExpenseSurplusNotes
Namespace Prefix: | wtm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Net Investment Income, Surplus Notes + References No definition available. + Details
Name: | wtm_NetInvestmentIncomeSurplusNotes
Namespace Prefix: | wtm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Percentage of par value of policy reinsured. + References No definition available. + Details
Name: | wtm_PercentageOfParValueOfPolicyReinsured
Namespace Prefix: | wtm_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant