$WTM
WHITE MOUNTAINS INSURANCE GROUP LTD

2018 Form 10-K Financial Statement

#000077686719000008 Filed on February 27, 2019

View on sec.gov

Income Statement

Concept 2018 2017 Q4 2017 Q3
Revenue $369.1M $114.0M $87.50M
YoY Change -1.26% -2172.73% 54.05%
Cost Of Revenue $248.7M $33.10M
YoY Change 78.41% 37.92%
Gross Profit $120.4M $54.40M
YoY Change -48.63% 65.85%
Gross Profit Margin 32.62% 62.17%
Selling, General & Admin $513.3M $102.6M $74.80M
YoY Change 47.75% 17.06%
% of Gross Profit 426.33% 137.5%
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization $25.70M $5.900M $900.0K
YoY Change 14.73% -4.84% -30.77%
% of Gross Profit 21.35% 1.65%
Operating Expenses $537.8M $108.3M $78.20M
YoY Change 47.87% 56.96% 11.55%
Operating Profit -$417.4M -$23.80M
YoY Change 222.82% -36.19%
Interest Expense -$9.500M -$500.0K -$900.0K
YoY Change 313.04% 80.0%
% of Operating Profit
Other Income/Expense, Net
YoY Change
Pretax Income -$178.2M $5.200M $8.400M
YoY Change -2384.62% -106.98% -160.87%
Income Tax -$4.000M -$2.500M -$4.000M
% Of Pretax Income -48.08% -47.62%
Net Earnings -$191.4M $22.50M $551.5M
YoY Change -132.27% -157.84% 528.85%
Net Earnings / Revenue -51.86% 19.74% 630.29%
Basic Earnings Per Share -$41.76 $6.00 $130.80
Diluted Earnings Per Share -$41.76 $6.00 $130.80
COMMON SHARES
Basic Shares Outstanding 3.342M shares 3.750M shares 4.244M shares
Diluted Shares Outstanding 3.342M shares 4.244M shares

Balance Sheet

Concept 2018 2017 Q4 2017 Q3
SHORT-TERM ASSETS
Cash & Short-Term Investments
YoY Change
Cash & Equivalents $97.10M $48.60M
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% 0.0%
Intangibles $36.20M
YoY Change 87.56%
Long-Term Investments $2.543B $3.381B $3.281B
YoY Change -24.79% 24.58% -37.07%
Other Assets $3.000M $3.000M $0.00
YoY Change 0.0% -99.92% -100.0%
Total Long-Term Assets
YoY Change
TOTAL ASSETS
Total Short-Term Assets
Total Long-Term Assets
Total Assets $3.363B $3.659B $3.637B
YoY Change -8.09% -43.88% -45.58%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable
YoY Change
Accrued Expenses $39.00M $81.00M $77.00M
YoY Change -51.85% -15.63% -37.9%
Deferred Revenue
YoY Change
Short-Term Debt $0.00 $0.00 $0.00
YoY Change
Long-Term Debt Due
YoY Change
Total Short-Term Liabilities $73.00M $113.0M $127.0M
YoY Change -35.4% 3.67% -17.53%
LONG-TERM LIABILITIES
Long-Term Debt $193.0M $24.00M $9.000M
YoY Change 704.17% 84.62% -96.89%
Other Long-Term Liabilities $125.0M $25.00M $45.00M
YoY Change 400.0% -99.04% -79.45%
Total Long-Term Liabilities $318.0M $49.00M $54.00M
YoY Change 548.98% -98.12% -89.37%
TOTAL LIABILITIES
Total Short-Term Liabilities $73.00M $113.0M $127.0M
Total Long-Term Liabilities $318.0M $49.00M $54.00M
Total Liabilities $520.0M $298.4M $299.9M
YoY Change 211.38% -89.36% -89.59%
SHAREHOLDERS EQUITY
Retained Earnings $2.823B $2.801B
YoY Change 1.68% -1.61%
Common Stock $670.6M $669.3M
YoY Change -17.28% -17.35%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity $2.843B $3.493B $3.469B
YoY Change
Total Liabilities & Shareholders Equity $3.363B $3.659B $3.637B
YoY Change -8.09% -43.88% -45.58%

Cashflow Statement

Concept 2018 2017 Q4 2017 Q3
OPERATING ACTIVITIES
Net Income -$191.4M $22.50M $551.5M
YoY Change -132.27% -157.84% 528.85%
Depreciation, Depletion And Amortization $25.70M $5.900M $900.0K
YoY Change 14.73% -4.84% -30.77%
Cash From Operating Activities -$31.10M $2.000M $71.50M
YoY Change -132.88% -110.81% 57.14%
INVESTING ACTIVITIES
Capital Expenditures
YoY Change
Acquisitions
YoY Change
Other Investing Activities -$23.40M $20.80M $733.6M
YoY Change -259.18% -131.37% 86.86%
Cash From Investing Activities $459.2M $20.80M $733.7M
YoY Change -36.09% -131.8% 86.55%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net $511.9M
YoY Change -28.37%
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities -$414.3M 25.70M -713.5M
YoY Change -40.73% -230.46% 120.28%
NET CHANGE
Cash From Operating Activities -$31.10M 2.000M 71.50M
Cash From Investing Activities $459.2M 20.80M 733.7M
Cash From Financing Activities -$414.3M 25.70M -713.5M
Net Change In Cash $13.20M 48.50M 91.70M
YoY Change -17.5% -146.81% -20.19%
FREE CASH FLOW
Cash From Operating Activities -$31.10M $2.000M $71.50M
Capital Expenditures
Free Cash Flow
YoY Change

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CY2018 us-gaap Effect Of Exchange Rate On Cash And Cash Equivalents
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-600000 USD
CY2017Q4 us-gaap Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate
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0.35
CY2017Q4 us-gaap Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate
EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
0.21
CY2017 us-gaap Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate
EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
0.35
CY2018 us-gaap Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate
EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
0.21
CY2017 us-gaap Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Purchases
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3332500000 USD
CY2018 us-gaap Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Purchases
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1394300000 USD
CY2017 us-gaap Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Sales
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2814600000 USD
CY2018 us-gaap Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Sales
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2171600000 USD
CY2017Q4 us-gaap Financial Guarantee Insurance Contracts Future Expected Premium Revenue To Be Recognized
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136800000 USD
CY2018Q4 us-gaap Financial Guarantee Insurance Contracts Future Expected Premium Revenue To Be Recognized
FinancialGuaranteeInsuranceContractsFutureExpectedPremiumRevenueToBeRecognized
176000000 USD
CY2017Q4 us-gaap Finite Lived Intangible Assets Accumulated Amortization
FiniteLivedIntangibleAssetsAccumulatedAmortization
34800000 USD
CY2018Q4 us-gaap Finite Lived Intangible Assets Accumulated Amortization
FiniteLivedIntangibleAssetsAccumulatedAmortization
53600000 USD
CY2018Q4 us-gaap Finite Lived Intangible Assets Amortization Expense Next Twelve Months
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18100000 USD
CY2018Q4 us-gaap Finite Lived Intangible Assets Amortization Expense Year Five
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89500000 USD
CY2018Q4 us-gaap Finite Lived Intangible Assets Amortization Expense Year Four
FiniteLivedIntangibleAssetsAmortizationExpenseYearFour
15800000 USD
CY2018Q4 us-gaap Finite Lived Intangible Assets Amortization Expense Year Three
FiniteLivedIntangibleAssetsAmortizationExpenseYearThree
16000000 USD
CY2018Q4 us-gaap Finite Lived Intangible Assets Amortization Expense Year Two
FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo
16000000 USD
CY2018Q4 us-gaap Finite Lived Intangible Assets Net
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155400000 USD
CY2016 us-gaap Foreign Currency Transaction Gain Loss Realized
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300000 USD
CY2017 us-gaap Foreign Currency Transaction Gain Loss Realized
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-11200000 USD
CY2018 us-gaap Foreign Currency Transaction Gain Loss Realized
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11000000 USD
CY2016 us-gaap Foreign Currency Transaction Gain Loss Unrealized
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-2700000 USD
CY2017 us-gaap Foreign Currency Transaction Gain Loss Unrealized
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11700000 USD
CY2018 us-gaap Foreign Currency Transaction Gain Loss Unrealized
ForeignCurrencyTransactionGainLossUnrealized
-11800000 USD
CY2016 us-gaap Gain Loss On Investments
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-27400000 USD
CY2017 us-gaap Gain Loss On Investments
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133300000 USD
CY2018 us-gaap Gain Loss On Investments
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-108300000 USD
CY2016 us-gaap General And Administrative Expense
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175500000 USD
CY2017 us-gaap General And Administrative Expense
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208000000 USD
CY2018 us-gaap General And Administrative Expense
GeneralAndAdministrativeExpense
235700000 USD
CY2016Q4 us-gaap Goodwill
Goodwill
25900000 USD
CY2017Q4 us-gaap Goodwill
Goodwill
25900000 USD
CY2018Q4 us-gaap Goodwill
Goodwill
379900000 USD
CY2017 us-gaap Goodwill Acquired During Period
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0 USD
CY2017Q4 us-gaap Goodwill Fair Value Disclosure
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25900000 USD
CY2018Q4 us-gaap Goodwill Fair Value Disclosure
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379900000 USD
CY2017 us-gaap Goodwill Foreign Currency Translation Gain Loss
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0 USD
CY2016 us-gaap Income Loss From Continuing Operations
IncomeLossFromContinuingOperations
-121600000 USD
CY2017 us-gaap Income Loss From Continuing Operations
IncomeLossFromContinuingOperations
49700000 USD
CY2018 us-gaap Income Loss From Continuing Operations
IncomeLossFromContinuingOperations
-124000000 USD
CY2016 us-gaap Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments
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-147300000 USD
CY2017Q1 us-gaap Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments
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-3600000 USD
CY2017Q2 us-gaap Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments
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-2200000 USD
CY2017Q3 us-gaap Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments
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8400000 USD
CY2017Q4 us-gaap Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments
IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
5200000 USD
CY2017 us-gaap Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments
IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
7800000 USD
CY2018Q1 us-gaap Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments
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-66000000 USD
CY2018Q2 us-gaap Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments
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-12400000 USD
CY2018Q3 us-gaap Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments
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44300000 USD
CY2018Q4 us-gaap Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments
IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
-144100000 USD
CY2018 us-gaap Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments
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-178200000 USD
CY2016 us-gaap Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest
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-114400000 USD
CY2017Q1 us-gaap Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest
IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest
-3300000 USD
CY2017Q2 us-gaap Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest
IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest
-1200000 USD
CY2017Q3 us-gaap Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest
IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest
12400000 USD
CY2017Q4 us-gaap Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest
IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest
7700000 USD
CY2017 us-gaap Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest
IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest
15600000 USD
CY2018Q1 us-gaap Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest
IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest
-66700000 USD
CY2018Q2 us-gaap Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest
IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest
-14900000 USD
CY2018Q3 us-gaap Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest
IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest
47900000 USD
CY2018Q4 us-gaap Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest
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-140500000 USD
CY2018 us-gaap Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest
IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest
-174200000 USD
CY2016 us-gaap Income Loss From Continuing Operations Per Basic Share
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-24.26
CY2017Q1 us-gaap Income Loss From Continuing Operations Per Basic Share
IncomeLossFromContinuingOperationsPerBasicShare
-0.52
CY2017Q2 us-gaap Income Loss From Continuing Operations Per Basic Share
IncomeLossFromContinuingOperationsPerBasicShare
2.36
CY2017Q3 us-gaap Income Loss From Continuing Operations Per Basic Share
IncomeLossFromContinuingOperationsPerBasicShare
5.36
CY2017Q4 us-gaap Income Loss From Continuing Operations Per Basic Share
IncomeLossFromContinuingOperationsPerBasicShare
4.85
CY2017 us-gaap Income Loss From Continuing Operations Per Basic Share
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11.56
CY2018Q1 us-gaap Income Loss From Continuing Operations Per Basic Share
IncomeLossFromContinuingOperationsPerBasicShare
-12.85
CY2018Q2 us-gaap Income Loss From Continuing Operations Per Basic Share
IncomeLossFromContinuingOperationsPerBasicShare
1.02
CY2018Q3 us-gaap Income Loss From Continuing Operations Per Basic Share
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18.27
CY2018Q3 us-gaap Income Loss From Discontinued Operations Net Of Tax Per Diluted Share
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-5.44
CY2018Q4 us-gaap Income Loss From Discontinued Operations Net Of Tax Per Diluted Share
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0.00
CY2018 us-gaap Income Loss From Discontinued Operations Net Of Tax Per Diluted Share
IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare
-5.09
CY2016 us-gaap Income Tax Expense Benefit
IncomeTaxExpenseBenefit
-32900000 USD
CY2017Q1 us-gaap Income Tax Expense Benefit
IncomeTaxExpenseBenefit
-300000 USD
CY2017Q2 us-gaap Income Tax Expense Benefit
IncomeTaxExpenseBenefit
-1000000 USD
CY2017Q3 us-gaap Income Tax Expense Benefit
IncomeTaxExpenseBenefit
-4000000 USD
CY2018Q4 us-gaap Income Loss From Continuing Operations Per Basic Share
IncomeLossFromContinuingOperationsPerBasicShare
-43.24
CY2018 us-gaap Income Loss From Continuing Operations Per Basic Share
IncomeLossFromContinuingOperationsPerBasicShare
-36.67
CY2016 us-gaap Income Loss From Continuing Operations Per Diluted Share
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-24.26
CY2017Q1 us-gaap Income Loss From Continuing Operations Per Diluted Share
IncomeLossFromContinuingOperationsPerDilutedShare
-0.52
CY2017Q2 us-gaap Income Loss From Continuing Operations Per Diluted Share
IncomeLossFromContinuingOperationsPerDilutedShare
2.36
CY2017Q3 us-gaap Income Loss From Continuing Operations Per Diluted Share
IncomeLossFromContinuingOperationsPerDilutedShare
5.36
CY2017Q4 us-gaap Income Loss From Continuing Operations Per Diluted Share
IncomeLossFromContinuingOperationsPerDilutedShare
4.85
CY2017 us-gaap Income Loss From Continuing Operations Per Diluted Share
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11.56
CY2018Q1 us-gaap Income Loss From Continuing Operations Per Diluted Share
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-12.85
CY2018Q2 us-gaap Income Loss From Continuing Operations Per Diluted Share
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1.02
CY2018Q3 us-gaap Income Loss From Continuing Operations Per Diluted Share
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18.27
CY2018Q4 us-gaap Income Loss From Continuing Operations Per Diluted Share
IncomeLossFromContinuingOperationsPerDilutedShare
-43.24
CY2018 us-gaap Income Loss From Continuing Operations Per Diluted Share
IncomeLossFromContinuingOperationsPerDilutedShare
-36.67
CY2016 us-gaap Income Loss From Discontinued Operations Net Of Tax
IncomeLossFromDiscontinuedOperationsNetOfTax
108300000 USD
CY2017Q1 us-gaap Income Loss From Discontinued Operations Net Of Tax
IncomeLossFromDiscontinuedOperationsNetOfTax
31300000 USD
CY2017Q2 us-gaap Income Loss From Discontinued Operations Net Of Tax
IncomeLossFromDiscontinuedOperationsNetOfTax
2800000 USD
CY2017Q3 us-gaap Income Loss From Discontinued Operations Net Of Tax
IncomeLossFromDiscontinuedOperationsNetOfTax
539100000 USD
CY2017Q4 us-gaap Income Loss From Discontinued Operations Net Of Tax
IncomeLossFromDiscontinuedOperationsNetOfTax
4300000 USD
CY2017 us-gaap Income Loss From Discontinued Operations Net Of Tax
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20500000 USD
CY2018Q1 us-gaap Income Loss From Discontinued Operations Net Of Tax
IncomeLossFromDiscontinuedOperationsNetOfTax
100000 USD
CY2018Q2 us-gaap Income Loss From Discontinued Operations Net Of Tax
IncomeLossFromDiscontinuedOperationsNetOfTax
0 USD
CY2018Q3 us-gaap Income Loss From Discontinued Operations Net Of Tax
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CY2018Q4 us-gaap Income Loss From Discontinued Operations Net Of Tax
IncomeLossFromDiscontinuedOperationsNetOfTax
0 USD
CY2018 us-gaap Income Loss From Discontinued Operations Net Of Tax
IncomeLossFromDiscontinuedOperationsNetOfTax
0 USD
CY2016 us-gaap Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity
IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity
523400000 USD
CY2017 us-gaap Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity
IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity
577500000 USD
CY2018 us-gaap Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity
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-17200000 USD
CY2016 us-gaap Income Loss From Discontinued Operations Net Of Tax Per Basic Share
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104.37
CY2017Q1 us-gaap Income Loss From Discontinued Operations Net Of Tax Per Basic Share
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6.86
CY2017Q2 us-gaap Income Loss From Discontinued Operations Net Of Tax Per Basic Share
IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare
0.61
CY2017Q3 us-gaap Income Loss From Discontinued Operations Net Of Tax Per Basic Share
IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare
125.45
CY2017Q4 us-gaap Income Loss From Discontinued Operations Net Of Tax Per Basic Share
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1.15
CY2017 us-gaap Income Loss From Discontinued Operations Net Of Tax Per Basic Share
IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare
134.50
CY2018Q1 us-gaap Income Loss From Discontinued Operations Net Of Tax Per Basic Share
IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare
0.03
CY2018Q2 us-gaap Income Loss From Discontinued Operations Net Of Tax Per Basic Share
IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare
0.00
CY2018Q3 us-gaap Income Loss From Discontinued Operations Net Of Tax Per Basic Share
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-5.44
CY2018Q4 us-gaap Income Loss From Discontinued Operations Net Of Tax Per Basic Share
IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare
0.00
CY2018 us-gaap Income Loss From Discontinued Operations Net Of Tax Per Basic Share
IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare
-5.09
CY2016 us-gaap Income Loss From Discontinued Operations Net Of Tax Per Diluted Share
IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare
104.32
CY2017Q1 us-gaap Income Loss From Discontinued Operations Net Of Tax Per Diluted Share
IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare
6.86
CY2017Q2 us-gaap Income Loss From Discontinued Operations Net Of Tax Per Diluted Share
IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare
0.61
CY2017Q3 us-gaap Income Loss From Discontinued Operations Net Of Tax Per Diluted Share
IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare
125.45
CY2017Q4 us-gaap Income Loss From Discontinued Operations Net Of Tax Per Diluted Share
IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare
1.15
CY2017 us-gaap Income Loss From Discontinued Operations Net Of Tax Per Diluted Share
IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare
134.50
CY2018Q1 us-gaap Income Loss From Discontinued Operations Net Of Tax Per Diluted Share
IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare
0.03
CY2018Q2 us-gaap Income Loss From Discontinued Operations Net Of Tax Per Diluted Share
IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare
0.00
CY2017Q4 us-gaap Income Tax Expense Benefit
IncomeTaxExpenseBenefit
-2500000 USD
CY2018Q1 us-gaap Income Tax Expense Benefit
IncomeTaxExpenseBenefit
700000 USD
CY2017 us-gaap Income Tax Expense Benefit
IncomeTaxExpenseBenefit
-7800000 USD
CY2018Q2 us-gaap Income Tax Expense Benefit
IncomeTaxExpenseBenefit
2500000 USD
CY2018Q3 us-gaap Income Tax Expense Benefit
IncomeTaxExpenseBenefit
-3600000 USD
CY2018Q4 us-gaap Income Tax Expense Benefit
IncomeTaxExpenseBenefit
-3600000 USD
CY2018 us-gaap Income Tax Expense Benefit
IncomeTaxExpenseBenefit
-4000000 USD
CY2016 us-gaap Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance
IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance
-6900000 USD
CY2017 us-gaap Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance
IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance
-42600000 USD
CY2018 us-gaap Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance
IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance
31000000 USD
CY2016 us-gaap Income Tax Reconciliation Change In Enacted Tax Rate
IncomeTaxReconciliationChangeInEnactedTaxRate
3900000 USD
CY2017 us-gaap Income Tax Reconciliation Change In Enacted Tax Rate
IncomeTaxReconciliationChangeInEnactedTaxRate
44300000 USD
CY2018 us-gaap Income Tax Reconciliation Change In Enacted Tax Rate
IncomeTaxReconciliationChangeInEnactedTaxRate
-1700000 USD
CY2016 us-gaap Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate
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-51600000 USD
CY2017 us-gaap Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate
IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
2700000 USD
CY2018 us-gaap Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate
IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
-37400000 USD
CY2016 us-gaap Income Tax Reconciliation Nondeductible Expense Share Based Compensation Cost
IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost
0 USD
CY2017 us-gaap Income Tax Reconciliation Nondeductible Expense Share Based Compensation Cost
IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost
4100000 USD
CY2018 us-gaap Income Tax Reconciliation Nondeductible Expense Share Based Compensation Cost
IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost
0 USD
CY2016 us-gaap Income Tax Reconciliation Other Adjustments
IncomeTaxReconciliationOtherAdjustments
-1100000 USD
CY2017 us-gaap Income Tax Reconciliation Other Adjustments
IncomeTaxReconciliationOtherAdjustments
1000000 USD
CY2018 us-gaap Income Tax Reconciliation Other Adjustments
IncomeTaxReconciliationOtherAdjustments
-300000 USD
CY2016 us-gaap Income Tax Reconciliation Repatriation Of Foreign Earnings
IncomeTaxReconciliationRepatriationOfForeignEarnings
19200000 USD
CY2017 us-gaap Income Tax Reconciliation Repatriation Of Foreign Earnings
IncomeTaxReconciliationRepatriationOfForeignEarnings
-21500000 USD
CY2018 us-gaap Income Tax Reconciliation Repatriation Of Foreign Earnings
IncomeTaxReconciliationRepatriationOfForeignEarnings
2900000 USD
CY2016 us-gaap Income Tax Reconciliation State And Local Income Taxes
IncomeTaxReconciliationStateAndLocalIncomeTaxes
1200000 USD
CY2017 us-gaap Income Tax Reconciliation State And Local Income Taxes
IncomeTaxReconciliationStateAndLocalIncomeTaxes
-600000 USD
CY2018 us-gaap Income Tax Reconciliation State And Local Income Taxes
IncomeTaxReconciliationStateAndLocalIncomeTaxes
-4000000 USD
CY2016 us-gaap Income Tax Reconciliation Tax Contingencies
IncomeTaxReconciliationTaxContingencies
0 USD
CY2017 us-gaap Income Tax Reconciliation Tax Contingencies
IncomeTaxReconciliationTaxContingencies
300000 USD
CY2018 us-gaap Income Tax Reconciliation Tax Contingencies
IncomeTaxReconciliationTaxContingencies
800000 USD
CY2016 us-gaap Income Tax Reconciliation Tax Exempt Income
IncomeTaxReconciliationTaxExemptIncome
100000 USD
CY2017 us-gaap Income Tax Reconciliation Tax Exempt Income
IncomeTaxReconciliationTaxExemptIncome
500000 USD
CY2018 us-gaap Income Tax Reconciliation Tax Exempt Income
IncomeTaxReconciliationTaxExemptIncome
600000 USD
CY2016 us-gaap Income Taxes Paid Net
IncomeTaxesPaidNet
300000 USD
CY2017 us-gaap Income Taxes Paid Net
IncomeTaxesPaidNet
2000000 USD
CY2018 us-gaap Income Taxes Paid Net
IncomeTaxesPaidNet
3500000 USD
CY2016 us-gaap Increase Decrease In Deferred Policy Acquisition Costs
IncreaseDecreaseInDeferredPolicyAcquisitionCosts
3700000 USD
CY2017 us-gaap Increase Decrease In Deferred Policy Acquisition Costs
IncreaseDecreaseInDeferredPolicyAcquisitionCosts
4200000 USD
CY2018 us-gaap Increase Decrease In Deferred Policy Acquisition Costs
IncreaseDecreaseInDeferredPolicyAcquisitionCosts
4200000 USD
CY2016 us-gaap Increase Decrease In Other Operating Capital Net
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146100000 USD
CY2017 us-gaap Increase Decrease In Other Operating Capital Net
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20800000 USD
CY2018 us-gaap Increase Decrease In Other Operating Capital Net
IncreaseDecreaseInOtherOperatingCapitalNet
27100000 USD
CY2016 us-gaap Increase Decrease In Restricted Cash For Operating Activities
IncreaseDecreaseInRestrictedCashForOperatingActivities
0 USD
CY2017 us-gaap Increase Decrease In Restricted Cash For Operating Activities
IncreaseDecreaseInRestrictedCashForOperatingActivities
0 USD
CY2018 us-gaap Increase Decrease In Restricted Cash For Operating Activities
IncreaseDecreaseInRestrictedCashForOperatingActivities
3400000 USD
CY2016 us-gaap Increase Decrease In Unearned Premiums
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31700000 USD
CY2017 us-gaap Increase Decrease In Unearned Premiums
IncreaseDecreaseInUnearnedPremiums
54500000 USD
CY2018 us-gaap Increase Decrease In Unearned Premiums
IncreaseDecreaseInUnearnedPremiums
39200000 USD
CY2016 us-gaap Incremental Common Shares Attributable To Share Based Payment Arrangements
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3217 shares
CY2017Q4 us-gaap Intangible Assets Net Including Goodwill
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62100000 USD
CY2018Q4 us-gaap Intangible Assets Net Including Goodwill
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537500000 USD
CY2016 us-gaap Interest And Dividend Income Operating
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34500000 USD
CY2017 us-gaap Interest And Dividend Income Operating
InterestAndDividendIncomeOperating
58500000 USD
CY2018 us-gaap Interest And Dividend Income Operating
InterestAndDividendIncomeOperating
62000000 USD
CY2016 us-gaap Interest Expense Debt
InterestExpenseDebt
3000000 USD
CY2017 us-gaap Interest Expense Debt
InterestExpenseDebt
2300000 USD
CY2018 us-gaap Interest Expense Debt
InterestExpenseDebt
9500000 USD
CY2016 us-gaap Interest Paid
InterestPaid
2100000 USD
CY2017 us-gaap Interest Paid
InterestPaid
1400000 USD
CY2018 us-gaap Interest Paid
InterestPaid
8800000 USD
CY2016 us-gaap Investment Income Investment Expense
InvestmentIncomeInvestmentExpense
2400000 USD
CY2017 us-gaap Investment Income Investment Expense
InvestmentIncomeInvestmentExpense
2500000 USD
CY2018 us-gaap Investment Income Investment Expense
InvestmentIncomeInvestmentExpense
3000000 USD
CY2017Q4 us-gaap Investments
Investments
3380700000 USD
CY2018Q4 us-gaap Investments
Investments
2542900000 USD
CY2016Q4 us-gaap Investments Fair Value Disclosure
InvestmentsFairValueDisclosure
2547300000 USD
CY2017Q4 us-gaap Investments Fair Value Disclosure
InvestmentsFairValueDisclosure
3208300000 USD
CY2018Q4 us-gaap Investments Fair Value Disclosure
InvestmentsFairValueDisclosure
2328700000 USD
CY2017Q4 us-gaap Liabilities
Liabilities
298400000 USD
CY2018Q4 us-gaap Liabilities
Liabilities
644400000 USD
CY2017Q4 us-gaap Liabilities And Stockholders Equity
LiabilitiesAndStockholdersEquity
3659200000 USD
CY2018Q4 us-gaap Liabilities And Stockholders Equity
LiabilitiesAndStockholdersEquity
3362600000 USD
CY2017Q4 us-gaap Long Term Debt
LongTermDebt
23800000 USD
CY2018Q4 us-gaap Long Term Debt
LongTermDebt
192700000 USD
CY2018Q4 us-gaap Long Term Debt Maturing In Years Four And Five
LongTermDebtMaturingInYearsFourAndFive
9400000 USD
CY2018Q4 us-gaap Long Term Debt Maturing In Years Two And Three
LongTermDebtMaturingInYearsTwoAndThree
10400000 USD
CY2018Q4 us-gaap Long Term Debt Maturities Repayments Of Principal After Year Five
LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive
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IncomeLossAllocatedToParticipatingUnvestedRestrictedCommonShares
-1500000 USD
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IncomeLossAllocatedToParticipatingUnvestedRestrictedCommonShares
700000 USD
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IncomeLossAllocatedToParticipatingUnvestedRestrictedCommonShares
-1400000 USD
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IncomeLossFromContinuingOperatingsExcludingPortionAttributableToNoncontrollingInterestNet
-120100000 USD
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IncomeLossFromContinuingOperatingsExcludingPortionAttributableToNoncontrollingInterestNet
49000000 USD
CY2018 wtm Income Loss From Continuing Operatings Excluding Portion Attributable To Noncontrolling Interest Net
IncomeLossFromContinuingOperatingsExcludingPortionAttributableToNoncontrollingInterestNet
-122600000 USD
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IncreaseDecreaseInUnsettledAccountsReceivableAndAccountsPayable
0 USD
CY2017 wtm Increase Decrease In Unsettled Accounts Receivable And Accounts Payable
IncreaseDecreaseInUnsettledAccountsReceivableAndAccountsPayable
0 USD
CY2018 wtm Increase Decrease In Unsettled Accounts Receivable And Accounts Payable
IncreaseDecreaseInUnsettledAccountsReceivableAndAccountsPayable
27600000 USD
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IntangibleAssetsGrossIncludingGoodwill
591100000 USD
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204600000 USD
CY2018Q4 wtm Investments Held In Trusts
InvestmentsHeldInTrusts
254300000 USD
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LongTermDebtMaturitiesRepaymentsOfPrincipalTotal
196900000 USD
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MembersCapitalContribution
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MembersCapitalContribution
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CY2018 wtm Members Capital Contribution
MembersCapitalContribution
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MinimumPercentageOfVariationFromExpectedPriceRequiredToTreatPricesOfInvestmentsProvidedByPricingServicesAsOutliers
0.05
CY2018Q4 wtm Minimum Variation From Expected Price Required To Treat Prices Of Investments Provided By Pricing Services As Outliers
MinimumVariationFromExpectedPriceRequiredToTreatPricesOfInvestmentsProvidedByPricingServicesAsOutliers
500000 USD
CY2016 wtm Net Income Loss Attributableto Parent Basicand Diluted Earnings Per Share Numerators
NetIncomeLossAttributabletoParentBasicandDilutedEarningsPerShareNumerators
-120100000 USD
CY2017 wtm Net Income Loss Attributableto Parent Basicand Diluted Earnings Per Share Numerators
NetIncomeLossAttributabletoParentBasicandDilutedEarningsPerShareNumerators
49000000 USD
CY2018 wtm Net Income Loss Attributableto Parent Basicand Diluted Earnings Per Share Numerators
NetIncomeLossAttributabletoParentBasicandDilutedEarningsPerShareNumerators
-122600000 USD
CY2016 wtm Net Realized Gain Lossand Foreign Currency Gain Losson Trading Securities Netof Tax
NetRealizedGainLossandForeignCurrencyGainLossonTradingSecuritiesNetofTax
224400000 USD
CY2017 wtm Net Realized Gain Lossand Foreign Currency Gain Losson Trading Securities Netof Tax
NetRealizedGainLossandForeignCurrencyGainLossonTradingSecuritiesNetofTax
15200000 USD
CY2018 wtm Net Realized Gain Lossand Foreign Currency Gain Losson Trading Securities Netof Tax
NetRealizedGainLossandForeignCurrencyGainLossonTradingSecuritiesNetofTax
-3800000 USD
CY2016 wtm Net Realizedand Unrealized Gain Losson Trading Securities Netof Tax
NetRealizedandUnrealizedGainLossonTradingSecuritiesNetofTax
-24700000 USD
CY2017 wtm Net Realizedand Unrealized Gain Losson Trading Securities Netof Tax
NetRealizedandUnrealizedGainLossonTradingSecuritiesNetofTax
120400000 USD
CY2018 wtm Net Realizedand Unrealized Gain Losson Trading Securities Netof Tax
NetRealizedandUnrealizedGainLossonTradingSecuritiesNetofTax
-90100000 USD
CY2016 wtm Net Unrealized Gain Loss And Foreign Currency Gain Loss On Trading Securities Net Of Tax
NetUnrealizedGainLossAndForeignCurrencyGainLossOnTradingSecuritiesNetOfTax
-249100000 USD
CY2017 wtm Net Unrealized Gain Loss And Foreign Currency Gain Loss On Trading Securities Net Of Tax
NetUnrealizedGainLossAndForeignCurrencyGainLossOnTradingSecuritiesNetOfTax
105200000 USD
CY2018 wtm Net Unrealized Gain Loss And Foreign Currency Gain Loss On Trading Securities Net Of Tax
NetUnrealizedGainLossAndForeignCurrencyGainLossOnTradingSecuritiesNetOfTax
-86300000 USD
CY2016 wtm Net Unrealized Gain Lossand Foreign Currency Gain Losson Trading Securities
NetUnrealizedGainLossandForeignCurrencyGainLossonTradingSecurities
-297400000 USD
CY2017 wtm Net Unrealized Gain Lossand Foreign Currency Gain Losson Trading Securities
NetUnrealizedGainLossandForeignCurrencyGainLossonTradingSecurities
109200000 USD
CY2018 wtm Net Unrealized Gain Lossand Foreign Currency Gain Losson Trading Securities
NetUnrealizedGainLossandForeignCurrencyGainLossonTradingSecurities
-95400000 USD
CY2016 wtm Net Unrealized Gain Lossand Foreign Currency Gain Losson Trading Securities Tax
NetUnrealizedGainLossandForeignCurrencyGainLossonTradingSecuritiesTax
-48300000 USD
CY2017 wtm Net Unrealized Gain Lossand Foreign Currency Gain Losson Trading Securities Tax
NetUnrealizedGainLossandForeignCurrencyGainLossonTradingSecuritiesTax
4000000 USD
CY2018 wtm Net Unrealized Gain Lossand Foreign Currency Gain Losson Trading Securities Tax
NetUnrealizedGainLossandForeignCurrencyGainLossonTradingSecuritiesTax
-9100000 USD
CY2016 wtm Other Comprehensive Income Loss Discontinued Operations Netof Tax Portion Attributableto Parent
OtherComprehensiveIncomeLossDiscontinuedOperationsNetofTaxPortionAttributabletoParent
146300000 USD
CY2017 wtm Other Comprehensive Income Loss Discontinued Operations Netof Tax Portion Attributableto Parent
OtherComprehensiveIncomeLossDiscontinuedOperationsNetofTaxPortionAttributabletoParent
3200000 USD
CY2018 wtm Other Comprehensive Income Loss Discontinued Operations Netof Tax Portion Attributableto Parent
OtherComprehensiveIncomeLossDiscontinuedOperationsNetofTaxPortionAttributabletoParent
0 USD
CY2016 wtm Paymentofcontingentconsideration
Paymentofcontingentconsideration
7800000 USD
CY2017 wtm Paymentofcontingentconsideration
Paymentofcontingentconsideration
0 USD
CY2018 wtm Paymentofcontingentconsideration
Paymentofcontingentconsideration
2600000 USD
CY2016 wtm Payments To Acquire Trading Common Equity Securities
PaymentsToAcquireTradingCommonEquitySecurities
278300000 USD
CY2017 wtm Payments To Acquire Trading Common Equity Securities
PaymentsToAcquireTradingCommonEquitySecurities
881200000 USD
CY2018 wtm Payments To Acquire Trading Common Equity Securities
PaymentsToAcquireTradingCommonEquitySecurities
328300000 USD
CY2016 wtm Payments To Acquire Trading Fixed Maturity And Convertible Fixed Maturity Investments
PaymentsToAcquireTradingFixedMaturityAndConvertibleFixedMaturityInvestments
4407000000 USD
CY2017 wtm Payments To Acquire Trading Fixed Maturity And Convertible Fixed Maturity Investments
PaymentsToAcquireTradingFixedMaturityAndConvertibleFixedMaturityInvestments
2365200000 USD
CY2018 wtm Payments To Acquire Trading Fixed Maturity And Convertible Fixed Maturity Investments
PaymentsToAcquireTradingFixedMaturityAndConvertibleFixedMaturityInvestments
970200000 USD
CY2017 wtm Percentage Of Investments Recorded At Fair Value
PercentageOfInvestmentsRecordedAtFairValue
0.94
CY2018 wtm Percentage Of Investments Recorded At Fair Value
PercentageOfInvestmentsRecordedAtFairValue
0.87
CY2016 wtm Percentage Of Likelihood For Realization Of Benefit Upon Ultimate Settlement
PercentageOfLikelihoodForRealizationOfBenefitUponUltimateSettlement
0.50
CY2017Q4 wtm Percentage Of Par Value Of Policy Reinsured
PercentageOfParValueOfPolicyReinsured
0.15
CY2018Q4 wtm Percentage Of Par Value Of Policy Reinsured
PercentageOfParValueOfPolicyReinsured
0.15
CY2017Q4 wtm Percentageof Risk Premium Ceded
PercentageofRiskPremiumCeded
0.6
CY2017 wtm Percentageofdiscountedfuturecashflows
Percentageofdiscountedfuturecashflows
0.1
CY2017 wtm Percentageofutilizationofnetoperatinglosses
Percentageofutilizationofnetoperatinglosses
0.8
CY2016 wtm Proceeds From Maturities Of Trading Fixed Maturity And Convertible Fixed Maturity Investments
ProceedsFromMaturitiesOfTradingFixedMaturityAndConvertibleFixedMaturityInvestments
253400000 USD
CY2017 wtm Proceeds From Maturities Of Trading Fixed Maturity And Convertible Fixed Maturity Investments
ProceedsFromMaturitiesOfTradingFixedMaturityAndConvertibleFixedMaturityInvestments
213400000 USD
CY2018 wtm Proceeds From Maturities Of Trading Fixed Maturity And Convertible Fixed Maturity Investments
ProceedsFromMaturitiesOfTradingFixedMaturityAndConvertibleFixedMaturityInvestments
141000000 USD
CY2016 wtm Proceeds From Sale Of Trading Common Equity Securities
ProceedsFromSaleOfTradingCommonEquitySecurities
815900000 USD
CY2017 wtm Proceeds From Sale Of Trading Common Equity Securities
ProceedsFromSaleOfTradingCommonEquitySecurities
424100000 USD
CY2018 wtm Proceeds From Sale Of Trading Common Equity Securities
ProceedsFromSaleOfTradingCommonEquitySecurities
169900000 USD
CY2016 wtm Proceeds From Sale Of Trading Fixed Maturity And Convertible Fixed Maturity Investments
ProceedsFromSaleOfTradingFixedMaturityAndConvertibleFixedMaturityInvestments
2605800000 USD
CY2017 wtm Proceeds From Sale Of Trading Fixed Maturity And Convertible Fixed Maturity Investments
ProceedsFromSaleOfTradingFixedMaturityAndConvertibleFixedMaturityInvestments
2124400000 USD
CY2018 wtm Proceeds From Sale Of Trading Fixed Maturity And Convertible Fixed Maturity Investments
ProceedsFromSaleOfTradingFixedMaturityAndConvertibleFixedMaturityInvestments
1848500000 USD
CY2016 wtm Proceedsfrom Saleand Maturityof Trading Securities Heldforinvestment Excluding Short Term Securities
ProceedsfromSaleandMaturityofTradingSecuritiesHeldforinvestmentExcludingShortTermSecurities
3692400000 USD
CY2017 wtm Proceedsfrom Saleand Maturityof Trading Securities Heldforinvestment Excluding Short Term Securities
ProceedsfromSaleandMaturityofTradingSecuritiesHeldforinvestmentExcludingShortTermSecurities
2791300000 USD
CY2018 wtm Proceedsfrom Saleand Maturityof Trading Securities Heldforinvestment Excluding Short Term Securities
ProceedsfromSaleandMaturityofTradingSecuritiesHeldforinvestmentExcludingShortTermSecurities
2164400000 USD
CY2016 wtm Proceedspaidtononcontrollingshareholdersfromthesaleofasubsidiary
Proceedspaidtononcontrollingshareholdersfromthesaleofasubsidiary
141600000 USD
CY2017 wtm Proceedspaidtononcontrollingshareholdersfromthesaleofasubsidiary
Proceedspaidtononcontrollingshareholdersfromthesaleofasubsidiary
0 USD
CY2018 wtm Proceedspaidtononcontrollingshareholdersfromthesaleofasubsidiary
Proceedspaidtononcontrollingshareholdersfromthesaleofasubsidiary
0 USD
CY2018 wtm Restricted Cash Acquired
RestrictedCashAcquired
53400000 USD
CY2016 wtm Stock Issued During Period To Directors
StockIssuedDuringPeriodToDirectors
1735 shares
CY2017 wtm Stock Issued During Period To Directors
StockIssuedDuringPeriodToDirectors
1959 shares
CY2018 wtm Stock Issued During Period To Directors
StockIssuedDuringPeriodToDirectors
2272 shares
CY2018Q4 wtm Supplement Trust Target
SupplementTrustTarget
603000000 USD
CY2016 wtm Taxon Net Realized Gain Lossand Foreign Currency Gain Losson Trading Securities
TaxonNetRealizedGainLossandForeignCurrencyGainLossonTradingSecurities
45600000 USD
CY2017 wtm Taxon Net Realized Gain Lossand Foreign Currency Gain Losson Trading Securities
TaxonNetRealizedGainLossandForeignCurrencyGainLossonTradingSecurities
8900000 USD
CY2018 wtm Taxon Net Realized Gain Lossand Foreign Currency Gain Losson Trading Securities
TaxonNetRealizedGainLossandForeignCurrencyGainLossonTradingSecurities
-9100000 USD
CY2016 wtm Taxonnetrealizedandunrealizedgainslosstradingsecurities
Taxonnetrealizedandunrealizedgainslosstradingsecurities
-2700000 USD
CY2017 wtm Taxonnetrealizedandunrealizedgainslosstradingsecurities
Taxonnetrealizedandunrealizedgainslosstradingsecurities
12900000 USD
CY2018 wtm Taxonnetrealizedandunrealizedgainslosstradingsecurities
Taxonnetrealizedandunrealizedgainslosstradingsecurities
-18200000 USD
CY2018Q4 wtm Trading Securities Amortized Cost
TradingSecuritiesAmortizedCost
1088100000 USD
CY2016 wtm Trading Securities Realized Foreign Currency Gain Loss Netof Tax
TradingSecuritiesRealizedForeignCurrencyGainLossNetofTax
300000 USD
CY2017 wtm Trading Securities Realized Foreign Currency Gain Loss Netof Tax
TradingSecuritiesRealizedForeignCurrencyGainLossNetofTax
-11200000 USD
CY2018 wtm Trading Securities Realized Foreign Currency Gain Loss Netof Tax
TradingSecuritiesRealizedForeignCurrencyGainLossNetofTax
11000000 USD
CY2016 wtm Trading Securities Realized Gain Loss Total
TradingSecuritiesRealizedGainLossTotal
270000000 USD
CY2017 wtm Trading Securities Realized Gain Loss Total
TradingSecuritiesRealizedGainLossTotal
24100000 USD
CY2018 wtm Trading Securities Realized Gain Loss Total
TradingSecuritiesRealizedGainLossTotal
-12900000 USD
CY2016 wtm Trading Securities Realized Holding Gain Losson Investmentsafter Tax
TradingSecuritiesRealizedHoldingGainLossonInvestmentsafterTax
224100000 USD
CY2017 wtm Trading Securities Realized Holding Gain Losson Investmentsafter Tax
TradingSecuritiesRealizedHoldingGainLossonInvestmentsafterTax
26400000 USD
CY2018 wtm Trading Securities Realized Holding Gain Losson Investmentsafter Tax
TradingSecuritiesRealizedHoldingGainLossonInvestmentsafterTax
-14800000 USD
CY2016 wtm Trading Securities Taxon Realized Foreign Currency Transaction Gain Loss Tax
TradingSecuritiesTaxonRealizedForeignCurrencyTransactionGainLossTax
0 USD
CY2017 wtm Trading Securities Taxon Realized Foreign Currency Transaction Gain Loss Tax
TradingSecuritiesTaxonRealizedForeignCurrencyTransactionGainLossTax
0 USD
CY2018 wtm Trading Securities Taxon Realized Foreign Currency Transaction Gain Loss Tax
TradingSecuritiesTaxonRealizedForeignCurrencyTransactionGainLossTax
0 USD
CY2016 wtm Trading Securities Taxon Unrealized Holding Gain Losson Investments
TradingSecuritiesTaxonUnrealizedHoldingGainLossonInvestments
-48300000 USD
CY2017 wtm Trading Securities Taxon Unrealized Holding Gain Losson Investments
TradingSecuritiesTaxonUnrealizedHoldingGainLossonInvestments
4000000 USD
CY2018 wtm Trading Securities Taxon Unrealized Holding Gain Losson Investments
TradingSecuritiesTaxonUnrealizedHoldingGainLossonInvestments
-9100000 USD
CY2016 wtm Trading Securities Unrealized Foreign Currency Gain Loss Net Of Tax
TradingSecuritiesUnrealizedForeignCurrencyGainLossNetOfTax
-2700000 USD
CY2017 wtm Trading Securities Unrealized Foreign Currency Gain Loss Net Of Tax
TradingSecuritiesUnrealizedForeignCurrencyGainLossNetOfTax
11700000 USD
CY2018 wtm Trading Securities Unrealized Foreign Currency Gain Loss Net Of Tax
TradingSecuritiesUnrealizedForeignCurrencyGainLossNetOfTax
-11800000 USD
CY2016 wtm Trading Securities Unrealized Foreign Currency Transaction Gain Loss Tax
TradingSecuritiesUnrealizedForeignCurrencyTransactionGainLossTax
0 USD
CY2017 wtm Trading Securities Unrealized Foreign Currency Transaction Gain Loss Tax
TradingSecuritiesUnrealizedForeignCurrencyTransactionGainLossTax
0 USD
CY2018 wtm Trading Securities Unrealized Foreign Currency Transaction Gain Loss Tax
TradingSecuritiesUnrealizedForeignCurrencyTransactionGainLossTax
0 USD
CY2016 wtm Trading Securities Unrealized Holding Gain Losson Investmentsafter Tax
TradingSecuritiesUnrealizedHoldingGainLossonInvestmentsafterTax
-246400000 USD
CY2017 wtm Trading Securities Unrealized Holding Gain Losson Investmentsafter Tax
TradingSecuritiesUnrealizedHoldingGainLossonInvestmentsafterTax
93500000 USD
CY2018 wtm Trading Securities Unrealized Holding Gain Losson Investmentsafter Tax
TradingSecuritiesUnrealizedHoldingGainLossonInvestmentsafterTax
-74500000 USD
CY2016 wtm Tradingsecurities Taxon Realized Holding Gain Losson Investments
TradingsecuritiesTaxonRealizedHoldingGainLossonInvestments
45600000 USD
CY2017 wtm Tradingsecurities Taxon Realized Holding Gain Losson Investments
TradingsecuritiesTaxonRealizedHoldingGainLossonInvestments
8900000 USD
CY2018 wtm Tradingsecurities Taxon Realized Holding Gain Losson Investments
TradingsecuritiesTaxonRealizedHoldingGainLossonInvestments
-9100000 USD
CY2018 us-gaap Derivatives Reporting Of Derivative Activity
DerivativesReportingOfDerivativeActivity
<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;">Derivatives </font></div><div style="line-height:120%;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;">Financial Instruments</font></div><div style="line-height:120%;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">White Mountains holds from time to time a variety of derivative financial instruments for risk management purposes. White Mountains recognizes all derivatives as either other assets or other liabilities, aside from the foreign currency forward contracts which are recognized within other long-term investments, measured at fair value, in the consolidated balance sheets. Changes in the fair value of derivative instruments are recognized in current period pre-tax income. </font></div></div>
CY2018 us-gaap Revenue Recognition Services Commissions
RevenueRecognitionServicesCommissions
<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-style:italic;font-weight:bold;">Revenue Recognition</font></div><div style="line-height:120%;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">MediaAlpha recognizes advertising and publishing fee revenues based on the contractual amount of the fees, adjusted for any amounts expected to be refunded or uncollectible, when it has satisfied its contractual performance obligations, which is generally at the time each transaction is executed. For transactions where MediaAlpha acts as the principal, such as the Open exchange, revenue amounts are reported gross. For transactions where MediaAlpha acts as an agent facilitating transactions between third parties, revenue amounts are reported at the net fee billed.</font></div><div style="line-height:120%;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Agent and commission revenues are measured based on the contractual rates with insurance carriers, net of any amounts expected to be uncollectible and any amounts associated with expected policy cancellations adjustments, and are recognized when contractual performance obligations have been fulfilled.</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>
CY2018 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>

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