2018 Q1 Form 10-Q Financial Statement

#000077686718000006 Filed on May 02, 2018

View on sec.gov

Income Statement

Concept 2018 Q1 2017 Q1
Revenue $42.10M $88.80M
YoY Change -52.59% 53.1%
Cost Of Revenue $58.10M $28.80M
YoY Change 101.74% -82.12%
Gross Profit -$16.00M $60.00M
YoY Change -126.67% -158.2%
Gross Profit Margin -38.0% 67.57%
Selling, General & Admin $103.1M $87.10M
YoY Change 18.37% 8.33%
% of Gross Profit 145.17%
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization $4.800M $5.800M
YoY Change -17.24% -49.12%
% of Gross Profit 9.67%
Operating Expenses $107.5M $92.00M
YoY Change 16.85% 5.38%
Operating Profit -$123.5M -$32.00M
YoY Change 285.94% -83.19%
Interest Expense -$600.0K -$400.0K
YoY Change 50.0% -66.67%
% of Operating Profit
Other Income/Expense, Net
YoY Change
Pretax Income -$66.00M -$3.600M
YoY Change 1733.33% -89.19%
Income Tax $700.0K -$300.0K
% Of Pretax Income
Net Earnings -$66.60M $28.00M
YoY Change -337.86% 45.08%
Net Earnings / Revenue -158.19% 31.53%
Basic Earnings Per Share -$12.82 $6.34
Diluted Earnings Per Share -$12.82 $6.34
COMMON SHARES
Basic Shares Outstanding 3.710M shares 4.512M shares
Diluted Shares Outstanding 3.710M shares 4.512M shares

Balance Sheet

Concept 2018 Q1 2017 Q1
SHORT-TERM ASSETS
Cash & Short-Term Investments
YoY Change
Cash & Equivalents $120.2M $45.40M
Short-Term Investments
Other Short-Term Assets
YoY Change
Inventory
Prepaid Expenses
Receivables
Other Receivables
Total Short-Term Assets
YoY Change
LONG-TERM ASSETS
Property, Plant & Equipment
YoY Change
Goodwill $25.90M $25.90M
YoY Change 0.0% 7.47%
Intangibles $21.30M
YoY Change -33.85%
Long-Term Investments $3.296B $5.339B
YoY Change -38.27% 46.68%
Other Assets $3.000M $126.0M
YoY Change -97.62% -97.65%
Total Long-Term Assets
YoY Change
TOTAL ASSETS
Total Short-Term Assets
Total Long-Term Assets
Total Assets $3.587B $6.490B
YoY Change -44.73% -37.54%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable
YoY Change
Accrued Expenses $33.00M $83.00M
YoY Change -60.24% -27.19%
Deferred Revenue
YoY Change
Short-Term Debt $0.00 $0.00
YoY Change
Long-Term Debt Due
YoY Change
Total Short-Term Liabilities $107.0M $100.0M
YoY Change 7.0% -17.36%
LONG-TERM LIABILITIES
Long-Term Debt $22.00M $285.0M
YoY Change -92.28% -46.53%
Other Long-Term Liabilities $23.00M $179.0M
YoY Change -87.15% -94.66%
Total Long-Term Liabilities $45.00M $464.0M
YoY Change -90.3% -88.05%
TOTAL LIABILITIES
Total Short-Term Liabilities $107.0M $100.0M
Total Long-Term Liabilities $45.00M $464.0M
Total Liabilities $291.2M $2.760B
YoY Change -89.45% -55.16%
SHAREHOLDERS EQUITY
Retained Earnings $2.765B $2.796B
YoY Change -1.11% -5.53%
Common Stock $675.3M $807.8M
YoY Change -16.4% -13.96%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity $3.439B $3.599B
YoY Change
Total Liabilities & Shareholders Equity $3.587B $6.490B
YoY Change -44.73% -37.54%

Cashflow Statement

Concept 2018 Q1 2017 Q1
OPERATING ACTIVITIES
Net Income -$66.60M $28.00M
YoY Change -337.86% 45.08%
Depreciation, Depletion And Amortization $4.800M $5.800M
YoY Change -17.24% -49.12%
Cash From Operating Activities -$44.70M -$56.10M
YoY Change -20.32% -35.22%
INVESTING ACTIVITIES
Capital Expenditures -$100.0K
YoY Change
Acquisitions
YoY Change
Other Investing Activities $100.0K $0.00
YoY Change -100.0%
Cash From Investing Activities $77.40M $39.30M
YoY Change 96.95% -77.52%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net $0.00
YoY Change -100.0%
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities -$9.600M -$8.900M
YoY Change 7.87% -91.49%
NET CHANGE
Cash From Operating Activities -$44.70M -$56.10M
Cash From Investing Activities $77.40M $39.30M
Cash From Financing Activities -$9.600M -$8.900M
Net Change In Cash $23.10M -$25.70M
YoY Change -189.88% 56.71%
FREE CASH FLOW
Cash From Operating Activities -$44.70M -$56.10M
Capital Expenditures -$100.0K
Free Cash Flow -$44.60M
YoY Change

Facts In Submission

Frame Concept Type Concept / XBRL Key Value Unit
CY2018Q1 dei Amendment Flag
AmendmentFlag
false
CY2018Q1 dei Current Fiscal Year End Date
CurrentFiscalYearEndDate
--12-31
CY2018Q1 dei Document Fiscal Period Focus
DocumentFiscalPeriodFocus
Q1
CY2018Q1 dei Document Fiscal Year Focus
DocumentFiscalYearFocus
2018
CY2018Q1 dei Document Period End Date
DocumentPeriodEndDate
2018-03-31
CY2018Q1 dei Document Type
DocumentType
10-Q
CY2018Q1 dei Entity Central Index Key
EntityCentralIndexKey
0000776867
CY2018Q2 dei Entity Common Stock Shares Outstanding
EntityCommonStockSharesOutstanding
3753405 shares
CY2018Q1 dei Entity Current Reporting Status
EntityCurrentReportingStatus
Yes
CY2018Q1 dei Entity Filer Category
EntityFilerCategory
Large Accelerated Filer
CY2018Q1 dei Entity Registrant Name
EntityRegistrantName
WHITE MOUNTAINS INSURANCE GROUP LTD
CY2017Q1 us-gaap Accretion Amortization Of Discounts And Premiums Investments
AccretionAmortizationOfDiscountsAndPremiumsInvestments
2500000 USD
CY2018Q1 us-gaap Accretion Amortization Of Discounts And Premiums Investments
AccretionAmortizationOfDiscountsAndPremiumsInvestments
1200000 USD
CY2017Q4 us-gaap Accumulated Other Comprehensive Income Loss Foreign Currency Translation Adjustment Net Of Tax
AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax
-1300000 USD
CY2018Q1 us-gaap Accumulated Other Comprehensive Income Loss Foreign Currency Translation Adjustment Net Of Tax
AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax
-1300000 USD
CY2017Q1 us-gaap Additional Paid In Capital Common Stock
AdditionalPaidInCapitalCommonStock
803200000 USD
CY2017Q4 us-gaap Additional Paid In Capital Common Stock
AdditionalPaidInCapitalCommonStock
666800000 USD
CY2018Q1 us-gaap Additional Paid In Capital Common Stock
AdditionalPaidInCapitalCommonStock
671500000 USD
CY2017Q1 us-gaap Advertising Revenue
AdvertisingRevenue
33800000 USD
CY2018Q1 us-gaap Advertising Revenue
AdvertisingRevenue
71000000 USD
CY2017Q1 us-gaap Amortization Of Intangible Assets
AmortizationOfIntangibleAssets
2300000 USD
CY2018Q1 us-gaap Amortization Of Intangible Assets
AmortizationOfIntangibleAssets
2900000 USD
CY2017Q1 us-gaap Assets
Assets
6490400000 USD
CY2017Q4 us-gaap Assets
Assets
3659200000 USD
CY2018Q1 us-gaap Assets
Assets
3587000000 USD
CY2017Q1 us-gaap Benefits Losses And Expenses
BenefitsLossesAndExpenses
92400000 USD
CY2018Q1 us-gaap Benefits Losses And Expenses
BenefitsLossesAndExpenses
108100000 USD
CY2016Q4 us-gaap Cash And Cash Equivalents At Carrying Value
CashAndCashEquivalentsAtCarryingValue
80200000 USD
CY2017Q1 us-gaap Cash And Cash Equivalents At Carrying Value
CashAndCashEquivalentsAtCarryingValue
45400000 USD
CY2017Q4 us-gaap Cash And Cash Equivalents At Carrying Value
CashAndCashEquivalentsAtCarryingValue
97100000 USD
CY2018Q1 us-gaap Cash And Cash Equivalents At Carrying Value
CashAndCashEquivalentsAtCarryingValue
120200000 USD
CY2017Q1 us-gaap Cash And Cash Equivalents Period Increase Decrease
CashAndCashEquivalentsPeriodIncreaseDecrease
-35700000 USD
CY2018Q1 us-gaap Cash And Cash Equivalents Period Increase Decrease
CashAndCashEquivalentsPeriodIncreaseDecrease
23100000 USD
CY2017Q1 us-gaap Common Stock Dividends Per Share Declared
CommonStockDividendsPerShareDeclared
1.00
CY2018Q1 us-gaap Common Stock Dividends Per Share Declared
CommonStockDividendsPerShareDeclared
1.00
CY2017Q4 us-gaap Common Stock Par Or Stated Value Per Share
CommonStockParOrStatedValuePerShare
1.00
CY2018Q1 us-gaap Common Stock Par Or Stated Value Per Share
CommonStockParOrStatedValuePerShare
1.00
CY2017Q4 us-gaap Common Stock Shares Authorized
CommonStockSharesAuthorized
50000000 shares
CY2018Q1 us-gaap Common Stock Shares Authorized
CommonStockSharesAuthorized
50000000 shares
CY2017Q4 us-gaap Common Stock Shares Issued
CommonStockSharesIssued
3750171 shares
CY2018Q1 us-gaap Common Stock Shares Issued
CommonStockSharesIssued
3753405 shares
CY2017Q4 us-gaap Common Stock Shares Outstanding
CommonStockSharesOutstanding
3750171 shares
CY2018Q1 us-gaap Common Stock Shares Outstanding
CommonStockSharesOutstanding
3753405 shares
CY2017Q1 us-gaap Common Stock Value
CommonStockValue
4600000 USD
CY2017Q4 us-gaap Common Stock Value
CommonStockValue
3800000 USD
CY2018Q1 us-gaap Common Stock Value
CommonStockValue
3800000 USD
CY2017Q1 us-gaap Comprehensive Income Net Of Tax
ComprehensiveIncomeNetOfTax
29200000 USD
CY2018Q1 us-gaap Comprehensive Income Net Of Tax
ComprehensiveIncomeNetOfTax
-48000000 USD
CY2017Q1 us-gaap Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest
ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest
0 USD
CY2018Q1 us-gaap Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest
ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest
0 USD
CY2017Q1 us-gaap Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest
ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest
29200000 USD
CY2018Q1 us-gaap Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest
ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest
-48000000 USD
CY2017Q1 us-gaap Cost Of Services
CostOfServices
28800000 USD
CY2018Q1 us-gaap Cost Of Services
CostOfServices
58100000 USD
CY2017Q1 us-gaap Deferred Income Tax Expense Benefit
DeferredIncomeTaxExpenseBenefit
-3000000 USD
CY2018Q1 us-gaap Deferred Income Tax Expense Benefit
DeferredIncomeTaxExpenseBenefit
-800000 USD
CY2017Q1 us-gaap Deferred Policy Acquisition Cost Amortization Expense
DeferredPolicyAcquisitionCostAmortizationExpense
1300000 USD
CY2018Q1 us-gaap Deferred Policy Acquisition Cost Amortization Expense
DeferredPolicyAcquisitionCostAmortizationExpense
1400000 USD
CY2017Q1 us-gaap Depreciation Depletion And Amortization
DepreciationDepletionAndAmortization
5800000 USD
CY2018Q1 us-gaap Depreciation Depletion And Amortization
DepreciationDepletionAndAmortization
4800000 USD
CY2017Q1 us-gaap Discontinued Operation Gain Loss On Disposal Of Discontinued Operation Net Of Tax
DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax
-1000000 USD
CY2017Q4 us-gaap Discontinued Operation Gain Loss On Disposal Of Discontinued Operation Net Of Tax
DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax
100000 USD
CY2018Q1 us-gaap Discontinued Operation Gain Loss On Disposal Of Discontinued Operation Net Of Tax
DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax
100000 USD
CY2017Q1 us-gaap Earnings Per Share Basic
EarningsPerShareBasic
6.34
CY2018Q1 us-gaap Earnings Per Share Basic
EarningsPerShareBasic
-12.82
CY2017Q1 us-gaap Earnings Per Share Basic And Diluted
EarningsPerShareBasicAndDiluted
-0.52
CY2018Q1 us-gaap Earnings Per Share Basic And Diluted
EarningsPerShareBasicAndDiluted
-12.85
CY2017Q1 us-gaap Earnings Per Share Diluted
EarningsPerShareDiluted
6.34
CY2018Q1 us-gaap Earnings Per Share Diluted
EarningsPerShareDiluted
-12.82
CY2017Q1 us-gaap Earnings Per Share Diluted Undistributed
EarningsPerShareDilutedUndistributed
-1.52
CY2018Q1 us-gaap Earnings Per Share Diluted Undistributed
EarningsPerShareDilutedUndistributed
-13.85
CY2017Q1 us-gaap Effective Income Tax Rate Continuing Operations
EffectiveIncomeTaxRateContinuingOperations
-0.083
CY2018Q1 us-gaap Effective Income Tax Rate Continuing Operations
EffectiveIncomeTaxRateContinuingOperations
-0.011
CY2017Q1 us-gaap Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate
EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
0.35
CY2018Q1 us-gaap Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate
EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
0.21
CY2017Q1 us-gaap Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Purchases
FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases
498900000 USD
CY2018Q1 us-gaap Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Purchases
FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases
692600000 USD
CY2017Q1 us-gaap Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Sales
FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales
466800000 USD
CY2018Q1 us-gaap Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Sales
FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales
1321800000 USD
CY2017Q4 us-gaap Financial Guarantee Insurance Contracts Future Expected Premium Revenue To Be Recognized
FinancialGuaranteeInsuranceContractsFutureExpectedPremiumRevenueToBeRecognized
136800000 USD
CY2018Q1 us-gaap Financial Guarantee Insurance Contracts Future Expected Premium Revenue To Be Recognized
FinancialGuaranteeInsuranceContractsFutureExpectedPremiumRevenueToBeRecognized
140200000 USD
CY2017Q1 us-gaap Foreign Currency Transaction Gain Loss Realized
ForeignCurrencyTransactionGainLossRealized
200000 USD
CY2018Q1 us-gaap Foreign Currency Transaction Gain Loss Realized
ForeignCurrencyTransactionGainLossRealized
11000000 USD
CY2017Q1 us-gaap Foreign Currency Transaction Gain Loss Unrealized
ForeignCurrencyTransactionGainLossUnrealized
-500000 USD
CY2018Q1 us-gaap Foreign Currency Transaction Gain Loss Unrealized
ForeignCurrencyTransactionGainLossUnrealized
-10700000 USD
CY2017Q1 us-gaap Gain Loss On Investments
GainLossOnInvestments
36300000 USD
CY2018Q1 us-gaap Gain Loss On Investments
GainLossOnInvestments
-53700000 USD
CY2017Q1 us-gaap General And Administrative Expense
GeneralAndAdministrativeExpense
60700000 USD
CY2018Q1 us-gaap General And Administrative Expense
GeneralAndAdministrativeExpense
47900000 USD
CY2016Q4 us-gaap Goodwill
Goodwill
25900000 USD
CY2017Q1 us-gaap Goodwill
Goodwill
25900000 USD
CY2017Q4 us-gaap Goodwill
Goodwill
25900000 USD
CY2018Q1 us-gaap Goodwill
Goodwill
25900000 USD
CY2017Q1 us-gaap Income Loss From Continuing Operations
IncomeLossFromContinuingOperations
-2300000 USD
CY2018Q1 us-gaap Income Loss From Continuing Operations
IncomeLossFromContinuingOperations
-48100000 USD
CY2017Q1 us-gaap Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments
IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
-3600000 USD
CY2018Q1 us-gaap Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments
IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
-66000000 USD
CY2017Q1 us-gaap Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest
IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest
-3300000 USD
CY2018Q1 us-gaap Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest
IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest
-66700000 USD
CY2017Q1 us-gaap Income Loss From Continuing Operations Per Basic And Diluted Share
IncomeLossFromContinuingOperationsPerBasicAndDilutedShare
6.34
CY2017Q1 us-gaap Income Loss From Continuing Operations Per Basic Share
IncomeLossFromContinuingOperationsPerBasicShare
-0.52
CY2018Q1 us-gaap Income Loss From Continuing Operations Per Basic Share
IncomeLossFromContinuingOperationsPerBasicShare
-12.85
CY2017Q1 us-gaap Income Loss From Continuing Operations Per Diluted Share
IncomeLossFromContinuingOperationsPerDilutedShare
-0.52
CY2018Q1 us-gaap Income Loss From Continuing Operations Per Diluted Share
IncomeLossFromContinuingOperationsPerDilutedShare
-12.85
CY2017Q1 us-gaap Income Loss From Discontinued Operations Net Of Tax
IncomeLossFromDiscontinuedOperationsNetOfTax
32300000 USD
CY2018Q1 us-gaap Income Loss From Discontinued Operations Net Of Tax
IncomeLossFromDiscontinuedOperationsNetOfTax
0 USD
CY2017Q1 us-gaap Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity
IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity
31300000 USD
CY2018Q1 us-gaap Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity
IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity
100000 USD
CY2017Q1 us-gaap Income Loss From Discontinued Operations Net Of Tax Per Basic Share
IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare
6.86
CY2018Q1 us-gaap Income Loss From Discontinued Operations Net Of Tax Per Basic Share
IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare
0.03
CY2017Q1 us-gaap Income Loss From Discontinued Operations Net Of Tax Per Diluted Share
IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare
6.86
CY2018Q1 us-gaap Income Loss From Discontinued Operations Net Of Tax Per Diluted Share
IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare
0.03
CY2017Q1 us-gaap Income Tax Expense Benefit
IncomeTaxExpenseBenefit
-300000 USD
CY2018Q1 us-gaap Income Tax Expense Benefit
IncomeTaxExpenseBenefit
700000 USD
CY2017Q1 us-gaap Income Taxes Paid Net
IncomeTaxesPaidNet
0 USD
CY2018Q1 us-gaap Income Taxes Paid Net
IncomeTaxesPaidNet
-200000 USD
CY2017Q1 us-gaap Increase Decrease In Deferred Policy Acquisition Costs
IncreaseDecreaseInDeferredPolicyAcquisitionCosts
1300000 USD
CY2018Q1 us-gaap Increase Decrease In Deferred Policy Acquisition Costs
IncreaseDecreaseInDeferredPolicyAcquisitionCosts
1100000 USD
CY2017Q1 us-gaap Increase Decrease In Other Operating Capital Net
IncreaseDecreaseInOtherOperatingCapitalNet
35900000 USD
CY2018Q1 us-gaap Increase Decrease In Other Operating Capital Net
IncreaseDecreaseInOtherOperatingCapitalNet
41300000 USD
CY2017Q1 us-gaap Increase Decrease In Unearned Premiums
IncreaseDecreaseInUnearnedPremiums
17400000 USD
CY2018Q1 us-gaap Increase Decrease In Unearned Premiums
IncreaseDecreaseInUnearnedPremiums
3400000 USD
CY2016Q4 us-gaap Intangible Assets Net Including Goodwill
IntangibleAssetsNetIncludingGoodwill
45200000 USD
CY2017Q1 us-gaap Intangible Assets Net Including Goodwill
IntangibleAssetsNetIncludingGoodwill
42900000 USD
CY2017Q4 us-gaap Intangible Assets Net Including Goodwill
IntangibleAssetsNetIncludingGoodwill
62100000 USD
CY2018Q1 us-gaap Intangible Assets Net Including Goodwill
IntangibleAssetsNetIncludingGoodwill
59200000 USD
CY2017Q1 us-gaap Interest And Dividend Income Operating
InterestAndDividendIncomeOperating
13300000 USD
CY2018Q1 us-gaap Interest And Dividend Income Operating
InterestAndDividendIncomeOperating
20400000 USD
CY2017Q1 us-gaap Interest Expense Debt
InterestExpenseDebt
400000 USD
CY2018Q1 us-gaap Interest Expense Debt
InterestExpenseDebt
600000 USD
CY2017Q1 us-gaap Interest Paid
InterestPaid
200000 USD
CY2018Q1 us-gaap Interest Paid
InterestPaid
300000 USD
CY2017Q1 us-gaap Investment Income Investment Expense
InvestmentIncomeInvestmentExpense
500000 USD
CY2018Q1 us-gaap Investment Income Investment Expense
InvestmentIncomeInvestmentExpense
700000 USD
CY2016Q4 us-gaap Investments Fair Value Disclosure
InvestmentsFairValueDisclosure
2547300000 USD
CY2017Q1 us-gaap Investments Fair Value Disclosure
InvestmentsFairValueDisclosure
2610800000 USD
CY2017Q4 us-gaap Investments Fair Value Disclosure
InvestmentsFairValueDisclosure
3208300000 USD
CY2018Q1 us-gaap Investments Fair Value Disclosure
InvestmentsFairValueDisclosure
2532500000 USD
CY2017Q1 us-gaap Liabilities
Liabilities
2759600000 USD
CY2017Q4 us-gaap Liabilities
Liabilities
298400000 USD
CY2018Q1 us-gaap Liabilities
Liabilities
291200000 USD
CY2017Q1 us-gaap Liabilities And Stockholders Equity
LiabilitiesAndStockholdersEquity
6490400000 USD
CY2017Q4 us-gaap Liabilities And Stockholders Equity
LiabilitiesAndStockholdersEquity
3659200000 USD
CY2018Q1 us-gaap Liabilities And Stockholders Equity
LiabilitiesAndStockholdersEquity
3587000000 USD
CY2017Q4 us-gaap Long Term Debt
LongTermDebt
23800000 USD
CY2018Q1 us-gaap Long Term Debt
LongTermDebt
21500000 USD
CY2017Q1 us-gaap Minority Interest
MinorityInterest
131500000 USD
CY2017Q4 us-gaap Minority Interest
MinorityInterest
-131700000 USD
CY2018Q1 us-gaap Minority Interest
MinorityInterest
-143200000 USD
CY2017Q1 us-gaap Net Cash Provided By Used In Financing Activities
NetCashProvidedByUsedInFinancingActivities
-8900000 USD
CY2018Q1 us-gaap Net Cash Provided By Used In Financing Activities
NetCashProvidedByUsedInFinancingActivities
-9600000 USD
CY2017Q1 us-gaap Net Cash Provided By Used In Financing Activities Continuing Operations
NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
12100000 USD
CY2018Q1 us-gaap Net Cash Provided By Used In Financing Activities Continuing Operations
NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
-9600000 USD
CY2017Q1 us-gaap Net Cash Provided By Used In Investing Activities
NetCashProvidedByUsedInInvestingActivities
39300000 USD
CY2018Q1 us-gaap Net Cash Provided By Used In Investing Activities
NetCashProvidedByUsedInInvestingActivities
77400000 USD
CY2017Q1 us-gaap Net Cash Provided By Used In Investing Activities Continuing Operations
NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
7000000 USD
CY2018Q1 us-gaap Net Cash Provided By Used In Investing Activities Continuing Operations
NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
77500000 USD
CY2017Q1 us-gaap Net Cash Provided By Used In Operating Activities
NetCashProvidedByUsedInOperatingActivities
-56100000 USD
CY2018Q1 us-gaap Net Cash Provided By Used In Operating Activities
NetCashProvidedByUsedInOperatingActivities
-44700000 USD
CY2017Q1 us-gaap Net Cash Provided By Used In Operating Activities Continuing Operations
NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
-54800000 USD
CY2018Q1 us-gaap Net Cash Provided By Used In Operating Activities Continuing Operations
NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
-44800000 USD
CY2017Q1 us-gaap Net Income Loss Attributable To Noncontrolling Interest
NetIncomeLossAttributableToNoncontrollingInterest
-1000000 USD
CY2018Q1 us-gaap Net Income Loss Attributable To Noncontrolling Interest
NetIncomeLossAttributableToNoncontrollingInterest
-18600000 USD
CY2017Q1 us-gaap Net Income Loss Available To Common Stockholders Basic
NetIncomeLossAvailableToCommonStockholdersBasic
29000000 USD
CY2018Q1 us-gaap Net Income Loss Available To Common Stockholders Basic
NetIncomeLossAvailableToCommonStockholdersBasic
-48000000 USD
CY2017Q1 us-gaap Net Investment Income
NetInvestmentIncome
12800000 USD
CY2018Q1 us-gaap Net Investment Income
NetInvestmentIncome
19700000 USD
CY2017Q1 us-gaap Net Realized Or Unrealized Gain Loss On Trading Securities
NetRealizedOrUnrealizedGainLossOnTradingSecurities
36300000 USD
CY2018Q1 us-gaap Net Realized Or Unrealized Gain Loss On Trading Securities
NetRealizedOrUnrealizedGainLossOnTradingSecurities
-53700000 USD
CY2017Q1 us-gaap Other Comprehensive Income Loss Net Of Tax
OtherComprehensiveIncomeLossNetOfTax
100000 USD
CY2018Q1 us-gaap Other Comprehensive Income Loss Net Of Tax
OtherComprehensiveIncomeLossNetOfTax
0 USD
CY2017Q1 us-gaap Other Comprehensive Income Other Net Of Tax
OtherComprehensiveIncomeOtherNetOfTax
200000 USD
CY2017Q1 us-gaap Other Income
OtherIncome
2900000 USD
CY2018Q1 us-gaap Other Income
OtherIncome
2100000 USD
CY2017Q1 us-gaap Other Underwriting Expense
OtherUnderwritingExpense
100000 USD
CY2018Q1 us-gaap Other Underwriting Expense
OtherUnderwritingExpense
100000 USD
CY2017Q1 us-gaap Payments For Proceeds From Other Investing Activities
PaymentsForProceedsFromOtherInvestingActivities
0 USD
CY2018Q1 us-gaap Payments For Proceeds From Other Investing Activities
PaymentsForProceedsFromOtherInvestingActivities
100000 USD
CY2017Q1 us-gaap Payments For Proceeds From Short Term Investments
PaymentsForProceedsFromShortTermInvestments
-36100000 USD
CY2018Q1 us-gaap Premiums Earned Net
PremiumsEarnedNet
3000000 USD
CY2017Q1 us-gaap Premiums Earned Net
PremiumsEarnedNet
3000000 USD
CY2018Q1 us-gaap Payments For Proceeds From Short Term Investments
PaymentsForProceedsFromShortTermInvestments
587500000 USD
CY2017Q1 us-gaap Payments Of Capital Distribution
PaymentsOfCapitalDistribution
300000 USD
CY2018Q1 us-gaap Payments Of Capital Distribution
PaymentsOfCapitalDistribution
0 USD
CY2017Q1 us-gaap Payments Of Dividends Common Stock
PaymentsOfDividendsCommonStock
4600000 USD
CY2018Q1 us-gaap Payments Of Dividends Common Stock
PaymentsOfDividendsCommonStock
3800000 USD
CY2017Q1 us-gaap Payments To Acquire Other Investments
PaymentsToAcquireOtherInvestments
21600000 USD
CY2018Q1 us-gaap Payments To Acquire Other Investments
PaymentsToAcquireOtherInvestments
46000000 USD
CY2017Q1 us-gaap Policyholder Benefits And Claims Incurred Net
PolicyholderBenefitsAndClaimsIncurredNet
1100000 USD
CY2017Q1 us-gaap Proceeds From Payments For Other Financing Activities
ProceedsFromPaymentsForOtherFinancingActivities
-6500000 USD
CY2018Q1 us-gaap Proceeds From Payments For Other Financing Activities
ProceedsFromPaymentsForOtherFinancingActivities
-8400000 USD
CY2017Q1 us-gaap Proceeds From Sale And Maturity Of Other Investments
ProceedsFromSaleAndMaturityOfOtherInvestments
3200000 USD
CY2018Q1 us-gaap Proceeds From Sale And Maturity Of Other Investments
ProceedsFromSaleAndMaturityOfOtherInvestments
-6900000 USD
CY2017Q1 us-gaap Profit Loss
ProfitLoss
28000000 USD
CY2018Q1 us-gaap Profit Loss
ProfitLoss
-66600000 USD
CY2017Q1 us-gaap Repayments Of Debt
RepaymentsOfDebt
1200000 USD
CY2018Q1 us-gaap Repayments Of Debt
RepaymentsOfDebt
2300000 USD
CY2016Q4 us-gaap Restricted Cash And Cash Equivalents At Carrying Value
RestrictedCashAndCashEquivalentsAtCarryingValue
0 USD
CY2017Q1 us-gaap Restricted Cash And Cash Equivalents At Carrying Value
RestrictedCashAndCashEquivalentsAtCarryingValue
0 USD
CY2017Q4 us-gaap Restricted Cash And Cash Equivalents At Carrying Value
RestrictedCashAndCashEquivalentsAtCarryingValue
0 USD
CY2018Q1 us-gaap Restricted Cash And Cash Equivalents At Carrying Value
RestrictedCashAndCashEquivalentsAtCarryingValue
0 USD
CY2017Q1 us-gaap Retained Earnings Accumulated Deficit
RetainedEarningsAccumulatedDeficit
2795900000 USD
CY2017Q4 us-gaap Retained Earnings Accumulated Deficit
RetainedEarningsAccumulatedDeficit
2823200000 USD
CY2018Q1 us-gaap Retained Earnings Accumulated Deficit
RetainedEarningsAccumulatedDeficit
2765000000 USD
CY2017Q1 us-gaap Revenues
Revenues
88800000 USD
CY2018Q1 us-gaap Revenues
Revenues
42100000 USD
CY2016Q4 us-gaap Shares Issued Price Per Share
SharesIssuedPricePerShare
742
CY2017Q1 us-gaap Stockholders Equity
StockholdersEquity
3599300000 USD
CY2017Q4 us-gaap Stockholders Equity
StockholdersEquity
3492500000 USD
CY2018Q1 us-gaap Stockholders Equity
StockholdersEquity
3439000000 USD
CY2017Q1 us-gaap Stockholders Equity Including Portion Attributable To Noncontrolling Interest
StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
3730800000 USD
CY2017Q4 us-gaap Stockholders Equity Including Portion Attributable To Noncontrolling Interest
StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
3360800000 USD
CY2018Q1 us-gaap Stockholders Equity Including Portion Attributable To Noncontrolling Interest
StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
3295800000 USD
CY2017Q1 us-gaap Trading Securities Realized Gain Loss
TradingSecuritiesRealizedGainLoss
400000 USD
CY2018Q1 us-gaap Trading Securities Realized Gain Loss
TradingSecuritiesRealizedGainLoss
-16100000 USD
CY2017Q1 us-gaap Trading Securities Unrealized Holding Gain Loss
TradingSecuritiesUnrealizedHoldingGainLoss
36200000 USD
CY2018Q1 us-gaap Trading Securities Unrealized Holding Gain Loss
TradingSecuritiesUnrealizedHoldingGainLoss
-37900000 USD
CY2017Q1 us-gaap Undistributed Earnings
UndistributedEarnings
-6800000 USD
CY2018Q1 us-gaap Undistributed Earnings
UndistributedEarnings
-51400000 USD
CY2017Q1 us-gaap Weighted Average Number Diluted Shares Outstanding Adjustment
WeightedAverageNumberDilutedSharesOutstandingAdjustment
4564600 shares
CY2018Q1 us-gaap Weighted Average Number Diluted Shares Outstanding Adjustment
WeightedAverageNumberDilutedSharesOutstandingAdjustment
3746100 shares
CY2017Q1 us-gaap Weighted Average Number Of Diluted Shares Outstanding
WeightedAverageNumberOfDilutedSharesOutstanding
4512100 shares
CY2018Q1 us-gaap Weighted Average Number Of Diluted Shares Outstanding
WeightedAverageNumberOfDilutedSharesOutstanding
3710200 shares
CY2017Q1 us-gaap Weighted Average Number Of Shares Issued Basic
WeightedAverageNumberOfSharesIssuedBasic
4564600 shares
CY2018Q1 us-gaap Weighted Average Number Of Shares Issued Basic
WeightedAverageNumberOfSharesIssuedBasic
3746100 shares
CY2017Q1 us-gaap Weighted Average Number Of Shares Outstanding Basic
WeightedAverageNumberOfSharesOutstandingBasic
4512100 shares
CY2018Q1 us-gaap Weighted Average Number Of Shares Outstanding Basic
WeightedAverageNumberOfSharesOutstandingBasic
3710200 shares
CY2017Q1 us-gaap Weighted Average Number Of Shares Restricted Stock
WeightedAverageNumberOfSharesRestrictedStock
52500 shares
CY2018Q1 us-gaap Weighted Average Number Of Shares Restricted Stock
WeightedAverageNumberOfSharesRestrictedStock
35900 shares
CY2017Q1 wtm Accumulated Other Comprehensive Income Loss Net Of Tax Other
AccumulatedOtherComprehensiveIncomeLossNetOfTaxOther
-4400000 USD
CY2017Q1 wtm Aggregate Allocation To Restricted Shares Including Dividend
AggregateAllocationToRestrictedSharesIncludingDividend
0 USD
CY2018Q1 wtm Aggregate Allocation To Restricted Shares Including Dividend
AggregateAllocationToRestrictedSharesIncludingDividend
-400000 USD
CY2017Q1 wtm Amortizationof Restricted Sharesand Option Awards
AmortizationofRestrictedSharesandOptionAwards
1800000 USD
CY2018Q1 wtm Amortizationof Restricted Sharesand Option Awards
AmortizationofRestrictedSharesandOptionAwards
3200000 USD
CY2016Q4 wtm Cash Reclassified To Assets Held For Sale
CashReclassifiedToAssetsHeldForSale
900000 USD
CY2017Q1 wtm Cash Reclassified To Assets Held For Sale
CashReclassifiedToAssetsHeldForSale
0 USD
CY2017Q4 wtm Cash Reclassified To Assets Held For Sale
CashReclassifiedToAssetsHeldForSale
0 USD
CY2018Q1 wtm Cash Reclassified To Assets Held For Sale
CashReclassifiedToAssetsHeldForSale
0 USD
CY2017Q1 wtm Distributionfrom Contributionsto Discontinued Operationsfor Investing Activities
DistributionfromContributionstoDiscontinuedOperationsforInvestingActivities
0 USD
CY2018Q1 wtm Distributionfrom Contributionsto Discontinued Operationsfor Investing Activities
DistributionfromContributionstoDiscontinuedOperationsforInvestingActivities
-100000 USD
CY2017Q1 wtm Distributionsfromcontributionstodiscontinuedoperations
Distributionsfromcontributionstodiscontinuedoperations
15100000 USD
CY2018Q1 wtm Distributionsfromcontributionstodiscontinuedoperations
Distributionsfromcontributionstodiscontinuedoperations
0 USD
CY2017Q1 wtm Dividends Common Stock Cash Net Of Restricted Common Share Amounts
DividendsCommonStockCashNetOfRestrictedCommonShareAmounts
4500000 USD
CY2018Q1 wtm Dividends Common Stock Cash Net Of Restricted Common Share Amounts
DividendsCommonStockCashNetOfRestrictedCommonShareAmounts
3700000 USD
CY2017Q1 wtm Fair Value Assets Measured On Recurring Basis Gain Loss Included In Earnings
FairValueAssetsMeasuredOnRecurringBasisGainLossIncludedInEarnings
-39100000 USD
CY2018Q1 wtm Fair Value Assets Measured On Recurring Basis Gain Loss Included In Earnings
FairValueAssetsMeasuredOnRecurringBasisGainLossIncludedInEarnings
45400000 USD
CY2017Q1 wtm Fair Value Assets Measured On Recurring Basis Transfers In
FairValueAssetsMeasuredOnRecurringBasisTransfersIn
0 USD
CY2018Q1 wtm Fair Value Assets Measured On Recurring Basis Transfers In
FairValueAssetsMeasuredOnRecurringBasisTransfersIn
0 USD
CY2017Q1 wtm Fair Value Assets Measured On Recurring Basis Transfers Out
FairValueAssetsMeasuredOnRecurringBasisTransfersOut
0 USD
CY2018Q1 wtm Fair Value Assets Measured On Recurring Basis Transfers Out
FairValueAssetsMeasuredOnRecurringBasisTransfersOut
0 USD
CY2017Q1 wtm Income Loss From Continuing Operatings Excluding Portion Attributable To Noncontrolling Interest Net
IncomeLossFromContinuingOperatingsExcludingPortionAttributableToNoncontrollingInterestNet
-2300000 USD
CY2018Q1 wtm Income Loss From Continuing Operatings Excluding Portion Attributable To Noncontrolling Interest Net
IncomeLossFromContinuingOperatingsExcludingPortionAttributableToNoncontrollingInterestNet
-47700000 USD
CY2017Q1 wtm Increase Decrease In Unsettled Accounts Receivable And Accounts Payable
IncreaseDecreaseInUnsettledAccountsReceivableAndAccountsPayable
3100000 USD
CY2018Q1 wtm Increase Decrease In Unsettled Accounts Receivable And Accounts Payable
IncreaseDecreaseInUnsettledAccountsReceivableAndAccountsPayable
42900000 USD
CY2017Q1 wtm Members Capital Contribution
MembersCapitalContribution
-9600000 USD
CY2018Q1 wtm Members Capital Contribution
MembersCapitalContribution
-4900000 USD
CY2017Q1 wtm Net Income Loss Attributableto Parent Basicand Diluted Earnings Per Share Numerators
NetIncomeLossAttributabletoParentBasicandDilutedEarningsPerShareNumerators
-2300000 USD
CY2018Q1 wtm Net Income Loss Attributableto Parent Basicand Diluted Earnings Per Share Numerators
NetIncomeLossAttributabletoParentBasicandDilutedEarningsPerShareNumerators
-47700000 USD
CY2017Q1 wtm Net Realized Gain Lossand Foreign Currency Gain Losson Trading Securities Netof Tax
NetRealizedGainLossandForeignCurrencyGainLossonTradingSecuritiesNetofTax
400000 USD
CY2018Q1 wtm Net Realized Gain Lossand Foreign Currency Gain Losson Trading Securities Netof Tax
NetRealizedGainLossandForeignCurrencyGainLossonTradingSecuritiesNetofTax
-5700000 USD
CY2017Q1 wtm Net Realizedand Unrealized Gain Losson Trading Securities Netof Tax
NetRealizedandUnrealizedGainLossonTradingSecuritiesNetofTax
32400000 USD
CY2018Q1 wtm Net Realizedand Unrealized Gain Losson Trading Securities Netof Tax
NetRealizedandUnrealizedGainLossonTradingSecuritiesNetofTax
-48000000 USD
CY2017Q1 wtm Net Unrealized Gain Loss And Foreign Currency Gain Loss On Trading Securities Net Of Tax
NetUnrealizedGainLossAndForeignCurrencyGainLossOnTradingSecuritiesNetOfTax
32000000 USD
CY2018Q1 wtm Net Unrealized Gain Loss And Foreign Currency Gain Loss On Trading Securities Net Of Tax
NetUnrealizedGainLossAndForeignCurrencyGainLossOnTradingSecuritiesNetOfTax
-42300000 USD
CY2017Q1 wtm Net Unrealized Gain Lossand Foreign Currency Gain Losson Trading Securities
NetUnrealizedGainLossandForeignCurrencyGainLossonTradingSecurities
35700000 USD
CY2018Q1 wtm Net Unrealized Gain Lossand Foreign Currency Gain Losson Trading Securities
NetUnrealizedGainLossandForeignCurrencyGainLossonTradingSecurities
-48600000 USD
CY2017Q1 wtm Net Unrealized Gain Lossand Foreign Currency Gain Losson Trading Securities Tax
NetUnrealizedGainLossandForeignCurrencyGainLossonTradingSecuritiesTax
3700000 USD
CY2018Q1 wtm Net Unrealized Gain Lossand Foreign Currency Gain Losson Trading Securities Tax
NetUnrealizedGainLossandForeignCurrencyGainLossonTradingSecuritiesTax
-6300000 USD
CY2017Q1 wtm Other Comprehensive Income Loss Discontinued Operations Netof Tax Portion Attributableto Parent
OtherComprehensiveIncomeLossDiscontinuedOperationsNetofTaxPortionAttributabletoParent
100000 USD
CY2018Q1 wtm Other Comprehensive Income Loss Discontinued Operations Netof Tax Portion Attributableto Parent
OtherComprehensiveIncomeLossDiscontinuedOperationsNetofTaxPortionAttributabletoParent
0 USD
CY2017Q1 wtm Payments To Acquire Trading Common Equity Securities
PaymentsToAcquireTradingCommonEquitySecurities
111900000 USD
CY2018Q1 wtm Payments To Acquire Trading Common Equity Securities
PaymentsToAcquireTradingCommonEquitySecurities
109400000 USD
CY2018Q1 wtm Proceeds From Sale Of Trading Fixed Maturity And Convertible Fixed Maturity Investments
ProceedsFromSaleOfTradingFixedMaturityAndConvertibleFixedMaturityInvestments
1266500000 USD
CY2017 wtm Percentage Of Investments Recorded At Fair Value
PercentageOfInvestmentsRecordedAtFairValue
0.94
CY2018Q1 wtm Percentage Of Investments Recorded At Fair Value
PercentageOfInvestmentsRecordedAtFairValue
0.92
CY2017Q1 wtm Payments To Acquire Trading Fixed Maturity And Convertible Fixed Maturity Investments
PaymentsToAcquireTradingFixedMaturityAndConvertibleFixedMaturityInvestments
363400000 USD
CY2018Q1 wtm Payments To Acquire Trading Fixed Maturity And Convertible Fixed Maturity Investments
PaymentsToAcquireTradingFixedMaturityAndConvertibleFixedMaturityInvestments
537100000 USD
CY2017Q1 wtm Proceeds From Maturities Of Trading Fixed Maturity And Convertible Fixed Maturity Investments
ProceedsFromMaturitiesOfTradingFixedMaturityAndConvertibleFixedMaturityInvestments
70200000 USD
CY2018Q1 wtm Proceeds From Maturities Of Trading Fixed Maturity And Convertible Fixed Maturity Investments
ProceedsFromMaturitiesOfTradingFixedMaturityAndConvertibleFixedMaturityInvestments
40600000 USD
CY2017Q1 wtm Proceeds From Sale Of Trading Common Equity Securities
ProceedsFromSaleOfTradingCommonEquitySecurities
15900000 USD
CY2018Q1 wtm Proceeds From Sale Of Trading Common Equity Securities
ProceedsFromSaleOfTradingCommonEquitySecurities
14400000 USD
CY2017Q1 wtm Proceeds From Sale Of Trading Fixed Maturity And Convertible Fixed Maturity Investments
ProceedsFromSaleOfTradingFixedMaturityAndConvertibleFixedMaturityInvestments
375400000 USD
CY2017Q1 wtm Taxon Net Realized Gain Lossand Foreign Currency Gain Losson Trading Securities
TaxonNetRealizedGainLossandForeignCurrencyGainLossonTradingSecurities
200000 USD
CY2018Q1 wtm Taxon Net Realized Gain Lossand Foreign Currency Gain Losson Trading Securities
TaxonNetRealizedGainLossandForeignCurrencyGainLossonTradingSecurities
600000 USD
CY2017Q1 wtm Taxonnetrealizedandunrealizedgainslosstradingsecurities
Taxonnetrealizedandunrealizedgainslosstradingsecurities
3900000 USD
CY2018Q1 wtm Taxonnetrealizedandunrealizedgainslosstradingsecurities
Taxonnetrealizedandunrealizedgainslosstradingsecurities
-5700000 USD
CY2017Q1 wtm Trading Securities Realized Foreign Currency Gain Loss Netof Tax
TradingSecuritiesRealizedForeignCurrencyGainLossNetofTax
200000 USD
CY2018Q1 wtm Trading Securities Realized Foreign Currency Gain Loss Netof Tax
TradingSecuritiesRealizedForeignCurrencyGainLossNetofTax
11000000 USD
CY2017Q1 wtm Trading Securities Realized Gain Loss Total
TradingSecuritiesRealizedGainLossTotal
600000 USD
CY2018Q1 wtm Trading Securities Realized Gain Loss Total
TradingSecuritiesRealizedGainLossTotal
-5100000 USD
CY2017Q1 wtm Trading Securities Realized Holding Gain Losson Investmentsafter Tax
TradingSecuritiesRealizedHoldingGainLossonInvestmentsafterTax
200000 USD
CY2018Q1 wtm Trading Securities Realized Holding Gain Losson Investmentsafter Tax
TradingSecuritiesRealizedHoldingGainLossonInvestmentsafterTax
-16700000 USD
CY2017Q1 wtm Trading Securities Taxon Realized Foreign Currency Transaction Gain Loss Tax
TradingSecuritiesTaxonRealizedForeignCurrencyTransactionGainLossTax
0 USD
CY2018Q1 wtm Trading Securities Taxon Realized Foreign Currency Transaction Gain Loss Tax
TradingSecuritiesTaxonRealizedForeignCurrencyTransactionGainLossTax
0 USD
CY2017Q1 wtm Trading Securities Taxon Unrealized Holding Gain Losson Investments
TradingSecuritiesTaxonUnrealizedHoldingGainLossonInvestments
3700000 USD
CY2018Q1 wtm Trading Securities Taxon Unrealized Holding Gain Losson Investments
TradingSecuritiesTaxonUnrealizedHoldingGainLossonInvestments
-6300000 USD
CY2017Q1 wtm Trading Securities Unrealized Foreign Currency Gain Loss Net Of Tax
TradingSecuritiesUnrealizedForeignCurrencyGainLossNetOfTax
-500000 USD
CY2018Q1 wtm Trading Securities Unrealized Foreign Currency Gain Loss Net Of Tax
TradingSecuritiesUnrealizedForeignCurrencyGainLossNetOfTax
-10700000 USD
CY2017Q1 wtm Trading Securities Unrealized Foreign Currency Transaction Gain Loss Tax
TradingSecuritiesUnrealizedForeignCurrencyTransactionGainLossTax
0 USD
CY2018Q1 wtm Trading Securities Unrealized Foreign Currency Transaction Gain Loss Tax
TradingSecuritiesUnrealizedForeignCurrencyTransactionGainLossTax
0 USD
CY2017Q1 wtm Trading Securities Unrealized Holding Gain Losson Investmentsafter Tax
TradingSecuritiesUnrealizedHoldingGainLossonInvestmentsafterTax
32500000 USD
CY2018Q1 wtm Trading Securities Unrealized Holding Gain Losson Investmentsafter Tax
TradingSecuritiesUnrealizedHoldingGainLossonInvestmentsafterTax
-31600000 USD
CY2017Q1 wtm Tradingsecurities Taxon Realized Holding Gain Losson Investments
TradingsecuritiesTaxonRealizedHoldingGainLossonInvestments
200000 USD
CY2018Q1 wtm Tradingsecurities Taxon Realized Holding Gain Losson Investments
TradingsecuritiesTaxonRealizedHoldingGainLossonInvestments
600000 USD
CY2018Q1 us-gaap Loss Contingency Disclosures
LossContingencyDisclosures
<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;text-decoration:underline;">Contingencies</font></div><div style="line-height:120%;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">Legal Contingencies</font></div><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div><div style="line-height:120%;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">White Mountains is subject to litigation and arbitration in the normal course of business. White Mountains considers the requirements of ASC 450 when evaluating its exposure to litigation and arbitration. ASC 450 requires that accruals be established for litigation and arbitration if it is probable that a loss has been incurred and it can be reasonably estimated. ASC 450 also requires that litigation and arbitration be disclosed if it is probable that a loss has been incurred or if there is a reasonable possibility that a loss may have been incurred. White Mountains does not have any current litigation that may have a material adverse effect on White Mountains&#8217;s financial condition, results of operations or cash flows. </font></div><div style="line-height:120%;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">The following description presents significant legal contingencies, ongoing non-claims related litigation or arbitration as of </font><font style="font-family:inherit;font-size:10pt;">March&#160;31, 2018</font><font style="font-family:inherit;font-size:10pt;">: </font></div><div style="line-height:120%;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div><div style="line-height:120%;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-style:italic;font-weight:bold;">Sirius Tax Contingencies</font></div><div style="line-height:120%;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">A subsidiary of Sirius Group, which was sold by White Mountains in 2016, has been denied interest deductions by the Swedish Tax Authority (&#8220;STA&#8221;) for tax years 2013-2016.&#160; The Swedish subsidiary has filed an appeal in the Swedish Administrative Court for tax year 2013 and will preserve its right to contest the STA&#8217;s decision for later years if needed.&#160; Sirius Group believes it is more likely than not that it will prevail in the court proceedings.&#160; However, if the ultimate decision in the Swedish courts is unfavorable, White Mountains would be required to indemnify Sirius Group for the tax effect of the interest deductions, which is approximately </font><font style="font-family:inherit;font-size:10pt;">$18.5 million</font><font style="font-family:inherit;font-size:10pt;">.</font></div></div>
CY2018Q1 us-gaap Use Of Estimates
UseOfEstimates
<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-style:italic;font-weight:bold;">Use of Estimates</font></div><div style="line-height:120%;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities as of the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates.</font></div></div>

Files In Submission

Name View Source Status
0000776867-18-000006-index-headers.html Edgar Link pending
0000776867-18-000006-index.html Edgar Link pending
0000776867-18-000006.txt Edgar Link pending
0000776867-18-000006-xbrl.zip Edgar Link pending
FilingSummary.xml Edgar Link unprocessable
Financial_Report.xlsx Edgar Link pending
R1.htm Edgar Link pending
R10.htm Edgar Link pending
R11.htm Edgar Link pending
R12.htm Edgar Link pending
R13.htm Edgar Link pending
R14.htm Edgar Link pending
R15.htm Edgar Link pending
R16.htm Edgar Link pending
R17.htm Edgar Link pending
R18.htm Edgar Link pending
R19.htm Edgar Link pending
R2.htm Edgar Link pending
R20.htm Edgar Link pending
R21.htm Edgar Link pending
R22.htm Edgar Link pending
R23.htm Edgar Link pending
R24.htm Edgar Link pending
R25.htm Edgar Link pending
R26.htm Edgar Link pending
R27.htm Edgar Link pending
R28.htm Edgar Link pending
R29.htm Edgar Link pending
R3.htm Edgar Link pending
R30.htm Edgar Link pending
R31.htm Edgar Link pending
R32.htm Edgar Link pending
R33.htm Edgar Link pending
R34.htm Edgar Link pending
R35.htm Edgar Link pending
R36.htm Edgar Link pending
R37.htm Edgar Link pending
R38.htm Edgar Link pending
R39.htm Edgar Link pending
R4.htm Edgar Link pending
R40.htm Edgar Link pending
R41.htm Edgar Link pending
R42.htm Edgar Link pending
R43.htm Edgar Link pending
R44.htm Edgar Link pending
R45.htm Edgar Link pending
R46.htm Edgar Link pending
R47.htm Edgar Link pending
R48.htm Edgar Link pending
R49.htm Edgar Link pending
R5.htm Edgar Link pending
R50.htm Edgar Link pending
R51.htm Edgar Link pending
R52.htm Edgar Link pending
R53.htm Edgar Link pending
R54.htm Edgar Link pending
R55.htm Edgar Link pending
R56.htm Edgar Link pending
R57.htm Edgar Link pending
R58.htm Edgar Link pending
R59.htm Edgar Link pending
R6.htm Edgar Link pending
R60.htm Edgar Link pending
R61.htm Edgar Link pending
R62.htm Edgar Link pending
R63.htm Edgar Link pending
R64.htm Edgar Link pending
R65.htm Edgar Link pending
R66.htm Edgar Link pending
R67.htm Edgar Link pending
R68.htm Edgar Link pending
R69.htm Edgar Link pending
R7.htm Edgar Link pending
R70.htm Edgar Link pending
R71.htm Edgar Link pending
R72.htm Edgar Link pending
R73.htm Edgar Link pending
R74.htm Edgar Link pending
R75.htm Edgar Link pending
R76.htm Edgar Link pending
R77.htm Edgar Link pending
R78.htm Edgar Link pending
R79.htm Edgar Link pending
R8.htm Edgar Link pending
R80.htm Edgar Link pending
R81.htm Edgar Link pending
R82.htm Edgar Link pending
R83.htm Edgar Link pending
R84.htm Edgar Link pending
R85.htm Edgar Link pending
R86.htm Edgar Link pending
R87.htm Edgar Link pending
R9.htm Edgar Link pending
report.css Edgar Link pending
Show.js Edgar Link pending
wtm-20180331.xml Edgar Link completed
wtm-20180331.xsd Edgar Link pending
wtm-20180331_cal.xml Edgar Link unprocessable
wtm-20180331_def.xml Edgar Link unprocessable
wtm-20180331_lab.xml Edgar Link unprocessable
wtm-20180331_pre.xml Edgar Link unprocessable
wtm10-q33118.htm Edgar Link pending
wtm10-q33118ex10.htm Edgar Link pending
wtm10-q33118ex311.htm Edgar Link pending
wtm10-q33118ex312.htm Edgar Link pending
wtm10-q33118ex321.htm Edgar Link pending
wtm10-q33118ex322.htm Edgar Link pending