XML 16 R70.htm IDEA: XBRL DOCUMENT
v2.4.1.9

Debt (Details) (USD $) | 3 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Dec. 31, 2014 | Aug. 14, 2013 | Oct. 10, 2014 | Nov. 25, 2014
Debt Instrument |  |  |  |  |  |
Total debt | $ 749,800,000 us-gaap_LongTermDebt |  | $ 746,600,000 us-gaap_LongTermDebt |  |  |
Repayments of Debt | 1,300,000 us-gaap_RepaymentsOfDebt | 0 us-gaap_RepaymentsOfDebt |  |  |  |
Draw down of debt and revolving line of credit | 4,500,000 us-gaap_ProceedsFromLinesOfCredit | 0 us-gaap_ProceedsFromLinesOfCredit |  |  |  |
2012 OBH Senior Notes |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |
Total debt | 291,500,000 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = wtm_A2012ObhSeniorNotesMember |  | 286,000,000 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = wtm_A2012ObhSeniorNotesMember |  |  |
WTM Bank Facility |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |
Total commitment under revolving credit facility |  |  |  | 425,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_DebtInstrumentAxis = wtm_WtmBankFacilityMember |  |
Other Debt [Member] |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |
Total debt | 4,800,000 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = wtm_OtherDebtMember |  | 4,800,000 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = wtm_OtherDebtMember |  |  |
OneBeacon | 2012 OBH Senior Notes |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |
Debt instrument at face value | 275,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = wtm_A2012ObhSeniorNotesMember / dei_LegalEntityAxis = wtm_OnebeaconMember |  | 275,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = wtm_A2012ObhSeniorNotesMember / dei_LegalEntityAxis = wtm_OnebeaconMember |  |  |
Unamortized original issue discount | (300,000)us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_DebtInstrumentAxis = wtm_A2012ObhSeniorNotesMember / dei_LegalEntityAxis = wtm_OnebeaconMember |  | (300,000)us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_DebtInstrumentAxis = wtm_A2012ObhSeniorNotesMember / dei_LegalEntityAxis = wtm_OnebeaconMember |  |  |
Total debt | 274,700,000 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = wtm_A2012ObhSeniorNotesMember / dei_LegalEntityAxis = wtm_OnebeaconMember |  | 274,700,000 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = wtm_A2012ObhSeniorNotesMember / dei_LegalEntityAxis = wtm_OnebeaconMember |  |  |
Sirius Group | SIG Senior Notes |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |
Debt instrument at face value | 400,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = wtm_SiriusGroupSeniorNotesMember / dei_LegalEntityAxis = wtm_SiriusGroupMember |  | 400,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = wtm_SiriusGroupSeniorNotesMember / dei_LegalEntityAxis = wtm_SiriusGroupMember |  |  |
Unamortized original issue discount | (300,000)us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_DebtInstrumentAxis = wtm_SiriusGroupSeniorNotesMember / dei_LegalEntityAxis = wtm_SiriusGroupMember |  | (300,000)us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_DebtInstrumentAxis = wtm_SiriusGroupSeniorNotesMember / dei_LegalEntityAxis = wtm_SiriusGroupMember |  |  |
Total debt | 399,700,000 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = wtm_SiriusGroupSeniorNotesMember / dei_LegalEntityAxis = wtm_SiriusGroupMember |  | 399,700,000 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = wtm_SiriusGroupSeniorNotesMember / dei_LegalEntityAxis = wtm_SiriusGroupMember |  |  |
White Mountains | WTM Bank Facility |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |
Total debt | 0 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = wtm_WtmBankFacilityMember / dei_LegalEntityAxis = wtm_WhiteMountainsMember |  | 0 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = wtm_WtmBankFacilityMember / dei_LegalEntityAxis = wtm_WhiteMountainsMember |  |  |
Tranzact [Member] | Tranzact Bank Facility [Member] |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |
Line of Credit Facility, Amount Outstanding | 71,900,000 us-gaap_LineOfCreditFacilityAmountOutstanding / us-gaap_DebtInstrumentAxis = wtm_TranzactBankFacilityMember / dei_LegalEntityAxis = wtm_TranzactMember |  | 68,700,000 us-gaap_LineOfCreditFacilityAmountOutstanding / us-gaap_DebtInstrumentAxis = wtm_TranzactBankFacilityMember / dei_LegalEntityAxis = wtm_TranzactMember |  |  |
Unamortized Debt Issuance Expense | (1,300,000)us-gaap_UnamortizedDebtIssuanceExpense / us-gaap_DebtInstrumentAxis = wtm_TranzactBankFacilityMember / dei_LegalEntityAxis = wtm_TranzactMember |  | (1,300,000)us-gaap_UnamortizedDebtIssuanceExpense / us-gaap_DebtInstrumentAxis = wtm_TranzactBankFacilityMember / dei_LegalEntityAxis = wtm_TranzactMember |  |  |
Line of Credit Facility, Fair Value of Amount Outstanding | 70,600,000 us-gaap_LineOfCreditFacilityFairValueOfAmountOutstanding / us-gaap_DebtInstrumentAxis = wtm_TranzactBankFacilityMember / dei_LegalEntityAxis = wtm_TranzactMember |  | 67,400,000 us-gaap_LineOfCreditFacilityFairValueOfAmountOutstanding / us-gaap_DebtInstrumentAxis = wtm_TranzactBankFacilityMember / dei_LegalEntityAxis = wtm_TranzactMember |  | 70,000,000 us-gaap_LineOfCreditFacilityFairValueOfAmountOutstanding / us-gaap_DebtInstrumentAxis = wtm_TranzactBankFacilityMember / dei_LegalEntityAxis = wtm_TranzactMember |
Total commitment under revolving credit facility |  |  |  |  | 74,500,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_DebtInstrumentAxis = wtm_TranzactBankFacilityMember / dei_LegalEntityAxis = wtm_TranzactMember |
Line of Credit Facility, Remaining Borrowing Capacity |  |  |  |  | 4,500,000 us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity / us-gaap_DebtInstrumentAxis = wtm_TranzactBankFacilityMember / dei_LegalEntityAxis = wtm_TranzactMember |
Repayments of Debt | 1,300,000 us-gaap_RepaymentsOfDebt / us-gaap_DebtInstrumentAxis = wtm_TranzactBankFacilityMember / dei_LegalEntityAxis = wtm_TranzactMember |  |  |  |  |
Draw down of debt and revolving line of credit | 4,500,000 us-gaap_ProceedsFromLinesOfCredit / us-gaap_DebtInstrumentAxis = wtm_TranzactBankFacilityMember / dei_LegalEntityAxis = wtm_TranzactMember |  |  |  |  |
Sirius International [Member] | Letter of Credit [Member] |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |
number of Credit Lines |  |  |  |  |  | 2 wtm_NumberofCreditLines / us-gaap_DebtInstrumentAxis = us-gaap_LetterOfCreditMember / dei_LegalEntityAxis = wtm_SiriusInternationalMember
Line of Credit Facility, Fair Value of Amount Outstanding |  |  |  |  |  | 200,000,000 us-gaap_LineOfCreditFacilityFairValueOfAmountOutstanding / us-gaap_DebtInstrumentAxis = us-gaap_LetterOfCreditMember / dei_LegalEntityAxis = wtm_SiriusInternationalMember
Nordea Bank Finland |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |
Total commitment under revolving credit facility |  |  |  |  |  | 125,000,000.0 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = wtm_NordeaBankFinlandMember
Lloyds Bank plc [Member] |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |
Total commitment under revolving credit facility |  |  |  |  |  | 75,000,000.0 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = wtm_LloydsBankplcMember
Unsecured Debt [Member] | Nordea Bank Finland |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |
Total commitment under revolving credit facility |  |  |  |  |  | 100,000,000.0 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = wtm_NordeaBankFinlandMember / us-gaap_LongtermDebtTypeAxis = us-gaap_UnsecuredDebtMember
Unsecured Debt [Member] | Lloyds Bank plc [Member] |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |
Total commitment under revolving credit facility |  |  |  |  |  | $ 25,000,000.0 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = wtm_LloydsBankplcMember / us-gaap_LongtermDebtTypeAxis = us-gaap_UnsecuredDebtMember

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- Definition The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400 + Details
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- Definition Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 7 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20, 22 -Article 5 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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