$WTM
WHITE MOUNTAINS INSURANCE GROUP LTD Stock $wtm

$wtm Overview Financials Valuation SEC Filings Company Website

2022 Q1 Form 10-Q Financial Statement

#000077686722000005 Filed on May 06, 2022

Income Statement

Concept	2022 Q1	2021 Q1
Revenue	$348.9M	$178.2M
YoY Change	95.79%	-401.01%
Cost Of Revenue	$21.40M	$4.000M
YoY Change	435.0%	100.0%
Gross Profit	$327.5M	$174.2M
YoY Change	88.0%	-384.64%
Gross Profit Margin	93.87%	97.76%
Selling, General & Admin	$92.40M	$150.1M
YoY Change	-38.44%	58.67%
% of Gross Profit	28.21%	86.17%
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$16.00M	$12.80M
YoY Change	25.0%	80.28%
% of Gross Profit	4.89%	7.35%
Operating Expenses	$268.3M	$275.1M
YoY Change	-2.47%	171.3%
Operating Profit	$59.20M	-$100.9M
YoY Change	-158.67%	-37.95%
Interest Expense	-$6.900M	-$13.10M
YoY Change	-47.33%	142.59%
% of Operating Profit	-11.66%
Other Income/Expense, Net
YoY Change
Pretax Income	-$12.20M	-$138.7M
YoY Change	-91.2%	-16.45%
Income Tax	-$3.800M	-$9.500M
% Of Pretax Income
Net Earnings	$33.40M	-$75.30M
YoY Change	-144.36%	-41.54%
Net Earnings / Revenue	9.57%	-42.26%
Basic Earnings Per Share	$11.10	-$24.30
Diluted Earnings Per Share	$11.10	-$24.30
COMMON SHARES
Basic Shares Outstanding	2.977M shares	3.068M shares
Diluted Shares Outstanding	2.977M shares	3.068M shares

Balance Sheet

Concept	2022 Q1	2021 Q1
SHORT-TERM ASSETS
Cash & Short-Term Investments
YoY Change
Cash & Equivalents	$327.1M	$488.5M
Short-Term Investments
Other Short-Term Assets
YoY Change
Inventory
Prepaid Expenses
Receivables
Other Receivables
Total Short-Term Assets		$4.000M
YoY Change		-93.1%
LONG-TERM ASSETS
Property, Plant & Equipment	$41.60M	$40.00M
YoY Change	4.0%	73.91%
Goodwill	$641.4M	$613.4M
YoY Change	4.56%	56.32%
Intangibles
YoY Change
Long-Term Investments	$4.136B	$3.858B
YoY Change	7.21%	44.01%
Other Assets	$15.90M	$1.000M
YoY Change	1490.0%	-66.67%
Total Long-Term Assets		$6.897B
YoY Change		87.32%
TOTAL ASSETS
Total Short-Term Assets		$4.000M
Total Long-Term Assets		$6.897B
Total Assets	$7.357B	$6.901B
YoY Change	6.61%	84.53%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable
YoY Change
Accrued Expenses	$81.30M	$92.00M
YoY Change	-11.63%	104.44%
Deferred Revenue
YoY Change
Short-Term Debt	$0.00	$0.00
YoY Change
Long-Term Debt Due
YoY Change
Total Short-Term Liabilities	$81.30M	$154.0M
YoY Change	-47.21%	234.78%
LONG-TERM LIABILITIES
Long-Term Debt	$690.9M	$430.0M
YoY Change	60.67%	45.76%
Other Long-Term Liabilities	$270.3M	$217.0M
YoY Change	24.56%	70.87%
Total Long-Term Liabilities	$961.2M	$647.0M
YoY Change	48.56%	53.32%
TOTAL LIABILITIES
Total Short-Term Liabilities	$81.30M	$154.0M
Total Long-Term Liabilities	$961.2M	$647.0M
Total Liabilities	$3.687B	$2.965B
YoY Change	24.37%	279.81%
SHAREHOLDERS EQUITY
Retained Earnings	$2.956B	$3.227B
YoY Change	-8.38%	29.17%
Common Stock	$3.000M	$3.100M
YoY Change	-3.23%	-99.47%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$3.542B	$3.826B
YoY Change
Total Liabilities & Shareholders Equity	$7.357B	$6.901B
YoY Change	6.61%	84.53%

Cashflow Statement

Concept	2022 Q1	2021 Q1
OPERATING ACTIVITIES
Net Income	$33.40M	-$75.30M
YoY Change	-144.36%	-41.54%
Depreciation, Depletion And Amortization	$16.00M	$12.80M
YoY Change	25.0%	80.28%
Cash From Operating Activities	-$41.50M	-$92.80M
YoY Change	-55.28%	55.18%
INVESTING ACTIVITIES
Capital Expenditures
YoY Change
Acquisitions
YoY Change
Other Investing Activities	-$4.400M	-$60.90M
YoY Change	-92.78%	-219.65%
Cash From Investing Activities	$139.8M	$363.9M
YoY Change	-61.58%	352.05%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net	$34.80M	$0.00
YoY Change		-100.0%
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	-$31.10M	$6.500M
YoY Change	-578.46%	-114.71%
NET CHANGE
Cash From Operating Activities	-$41.50M	-$92.80M
Cash From Investing Activities	$139.8M	$363.9M
Cash From Financing Activities	-$31.10M	$6.500M
Net Change In Cash	$67.80M	$277.3M
YoY Change	-75.55%	-1227.24%
FREE CASH FLOW
Cash From Operating Activities	-$41.50M	-$92.80M
Capital Expenditures
Free Cash Flow
YoY Change

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2022Q1	dei	Entity Central Index Key EntityCentralIndexKey	0000776867
CY2022Q1	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2022Q1	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2022
CY2022Q1	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	Q1
CY2022Q1	dei	Amendment Flag AmendmentFlag	false
CY2022Q1	dei	Document Type DocumentType	10-Q
CY2022Q1	dei	Document Quarterly Report DocumentQuarterlyReport	true
CY2022Q1	dei	Document Period End Date DocumentPeriodEndDate	2022-03-31
CY2022Q1	dei	Document Transition Report DocumentTransitionReport	false
CY2022Q1	dei	Entity File Number EntityFileNumber	1-8993
CY2022Q1	dei	Entity Registrant Name EntityRegistrantName	WHITE MOUNTAINS INSURANCE GROUP, LTD
CY2022Q1	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	D0
CY2022Q1	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	94-2708455
CY2022Q1	dei	Entity Address Address Line1 EntityAddressAddressLine1	23 South Main Street, Suite 3B
CY2022Q1	dei	Entity Address City Or Town EntityAddressCityOrTown	Hanover,
CY2022Q1	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	03755-2053
CY2021Q1	us-gaap	Proceeds From Lines Of Credit ProceedsFromLinesOfCredit	105300000	USD
CY2021Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-24.30
CY2022Q1	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	1.00
CY2021Q1	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	1.00
CY2022Q1	dei	Entity Address State Or Province EntityAddressStateOrProvince	NH
CY2022Q1	dei	City Area Code CityAreaCode	603
CY2022Q1	dei	Local Phone Number LocalPhoneNumber	640-2200
CY2022Q1	dei	Security12b Title Security12bTitle	Common Shares, par value $1.00
CY2022Q1	dei	Trading Symbol TradingSymbol	WTM
CY2022Q1	dei	Security Exchange Name SecurityExchangeName	NYSE
CY2022Q1	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2022Q1	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
CY2022Q1	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2022Q1	dei	Entity Small Business EntitySmallBusiness	false
CY2022Q1	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
CY2022Q1	dei	Entity Shell Company EntityShellCompany	false
CY2022Q2	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	2981704	shares
CY2022Q1	us-gaap	Assets Assets	7356700000	USD
CY2021Q4	us-gaap	Assets Assets	7000700000	USD
CY2022Q1	us-gaap	Liabilities Liabilities	3687400000	USD
CY2021Q4	us-gaap	Liabilities Liabilities	3296000000	USD
CY2022Q1	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	1
CY2021Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	1
CY2022Q1	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	50000000	shares
CY2021Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	50000000	shares
CY2022Q1	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	2994162	shares
CY2022Q1	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	2994162	shares
CY2021Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	3017772	shares
CY2021Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	3017772	shares
CY2022Q1	us-gaap	Common Stock Value CommonStockValue	3000000.0	USD
CY2021Q4	us-gaap	Common Stock Value CommonStockValue	3000000.0	USD
CY2022Q1	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	583300000	USD
CY2021Q4	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	585900000	USD
CY2022Q1	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	2956200000	USD
CY2021Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	2957500000	USD
CY2022Q1	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-400000	USD
CY2022Q1	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	3669300000	USD
CY2021Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	1700000	USD
CY2022Q1	us-gaap	Stockholders Equity StockholdersEquity	3542100000	USD
CY2021Q4	us-gaap	Stockholders Equity StockholdersEquity	3548100000	USD
CY2022Q1	us-gaap	Minority Interest MinorityInterest	127200000	USD
CY2021Q4	us-gaap	Minority Interest MinorityInterest	156600000	USD
CY2021Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	3704700000	USD
CY2022Q1	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	7356700000	USD
CY2021Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	7000700000	USD
CY2022Q1	us-gaap	Revenues Revenues	348900000	USD
CY2021Q1	us-gaap	Revenues Revenues	178200000	USD
CY2022Q1	us-gaap	Benefits Losses And Expenses BenefitsLossesAndExpenses	361100000	USD
CY2021Q1	us-gaap	Benefits Losses And Expenses BenefitsLossesAndExpenses	316900000	USD
CY2022Q1	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	-12200000	USD
CY2021Q1	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	-138700000	USD
CY2022Q1	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-3800000	USD
CY2021Q1	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-9500000	USD
CY2022Q1	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	-8400000	USD
CY2021Q1	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	-129200000	USD
CY2022Q1	us-gaap	Discontinued Operation Gain Loss On Disposal Of Discontinued Operation Net Of Tax DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax	0	USD
CY2021Q1	us-gaap	Discontinued Operation Gain Loss On Disposal Of Discontinued Operation Net Of Tax DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax	18700000	USD
CY2022Q1	us-gaap	Profit Loss ProfitLoss	-8400000	USD
CY2021Q1	us-gaap	Profit Loss ProfitLoss	-110500000	USD
CY2022Q1	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	-41800000	USD
CY2021Q1	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	-35200000	USD
CY2022Q1	us-gaap	Net Income Loss NetIncomeLoss	33400000	USD
CY2021Q1	us-gaap	Net Income Loss NetIncomeLoss	-75300000	USD
CY2022Q1	us-gaap	Net Income Loss NetIncomeLoss	33400000	USD
CY2021Q1	us-gaap	Net Income Loss NetIncomeLoss	-75300000	USD
CY2022Q1	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-2300000	USD
CY2021Q1	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	1800000	USD
CY2022Q1	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	31100000	USD
CY2022Q1	us-gaap	Increase Decrease In Reserve For Commissions Expense And Taxes IncreaseDecreaseInReserveForCommissionsExpenseAndTaxes	12600000	USD
CY2021Q1	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	-73500000	USD
CY2022Q1	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	-200000	USD
CY2021Q1	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	100000	USD
CY2022Q1	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	31300000	USD
CY2021Q1	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	-73600000	USD
CY2022Q1	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	11.10
CY2021Q1	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	-30.33
CY2022Q1	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	0
CY2021Q1	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	6.03
CY2022Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	11.10
CY2021Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-24.30
CY2022Q1	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	11.10
CY2021Q1	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	-30.33
CY2022Q1	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	0
CY2021Q1	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	6.03
CY2022Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	11.10
CY2022Q1	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	4600000	USD
CY2022Q1	us-gaap	Profit Loss ProfitLoss	-8400000	USD
CY2021Q1	us-gaap	Profit Loss ProfitLoss	-110500000	USD
CY2022Q1	wtm	Gain Loss On Investments Net Of Tax GainLossOnInvestmentsNetOfTax	-8400000	USD
CY2021Q1	wtm	Gain Loss On Investments Net Of Tax GainLossOnInvestmentsNetOfTax	1100000	USD
CY2021Q1	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-1400000	USD
CY2022Q1	us-gaap	Discontinued Operation Gain Loss On Disposal Of Discontinued Operation Net Of Tax DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax	0	USD
CY2021Q1	us-gaap	Discontinued Operation Gain Loss On Disposal Of Discontinued Operation Net Of Tax DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax	18700000	USD
CY2022Q1	wtm	Amortizationof Restricted Sharesand Option Awards AmortizationofRestrictedSharesandOptionAwards	2900000	USD
CY2021Q1	wtm	Amortizationof Restricted Sharesand Option Awards AmortizationofRestrictedSharesandOptionAwards	4000000.0	USD
CY2022Q1	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	16000000.0	USD
CY2021Q1	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	12800000	USD
CY2022Q1	us-gaap	Increase Decrease In Reinsurance Recoverable IncreaseDecreaseInReinsuranceRecoverable	-35700000	USD
CY2021Q1	us-gaap	Increase Decrease In Reinsurance Recoverable IncreaseDecreaseInReinsuranceRecoverable	15700000	USD
CY2022Q1	us-gaap	Increase Decrease In Premiums Receivable IncreaseDecreaseInPremiumsReceivable	343600000	USD
CY2021Q1	us-gaap	Increase Decrease In Premiums Receivable IncreaseDecreaseInPremiumsReceivable	199700000	USD
CY2021Q1	us-gaap	Increase Decrease In Reserve For Commissions Expense And Taxes IncreaseDecreaseInReserveForCommissionsExpenseAndTaxes	200000	USD
CY2022Q1	wtm	Increase Decrease In Ceded Unearned Premiums IncreaseDecreaseInCededUnearnedPremiums	-19700000	USD
CY2021Q1	wtm	Increase Decrease In Ceded Unearned Premiums IncreaseDecreaseInCededUnearnedPremiums	24800000	USD
CY2022Q1	us-gaap	Increase Decrease In Liability For Claims And Claims Adjustment Expense Reserve IncreaseDecreaseInLiabilityForClaimsAndClaimsAdjustmentExpenseReserve	104900000	USD
CY2021Q1	us-gaap	Increase Decrease In Liability For Claims And Claims Adjustment Expense Reserve IncreaseDecreaseInLiabilityForClaimsAndClaimsAdjustmentExpenseReserve	56000000.0	USD
CY2022Q1	us-gaap	Increase Decrease In Other Accounts Payable IncreaseDecreaseInOtherAccountsPayable	10100000	USD
CY2021Q1	us-gaap	Increase Decrease In Other Accounts Payable IncreaseDecreaseInOtherAccountsPayable	2600000	USD
CY2022Q1	us-gaap	Increase Decrease In Unearned Premiums IncreaseDecreaseInUnearnedPremiums	388200000	USD
CY2021Q1	us-gaap	Increase Decrease In Unearned Premiums IncreaseDecreaseInUnearnedPremiums	245500000	USD
CY2022Q1	us-gaap	Increase Decrease In Deferred Policy Acquisition Costs IncreaseDecreaseInDeferredPolicyAcquisitionCosts	71600000	USD
CY2021Q1	us-gaap	Increase Decrease In Deferred Policy Acquisition Costs IncreaseDecreaseInDeferredPolicyAcquisitionCosts	51300000	USD
CY2022Q1	us-gaap	Increase Decrease In Funds Held Under Reinsurance Agreements IncreaseDecreaseInFundsHeldUnderReinsuranceAgreements	75200000	USD
CY2021Q1	us-gaap	Increase Decrease In Funds Held Under Reinsurance Agreements IncreaseDecreaseInFundsHeldUnderReinsuranceAgreements	40700000	USD
CY2022Q1	wtm	Increase Decrease In Restricted Cash Operating Activities IncreaseDecreaseInRestrictedCashOperatingActivities	-1000000.0	USD
CY2021Q1	wtm	Increase Decrease In Restricted Cash Operating Activities IncreaseDecreaseInRestrictedCashOperatingActivities	-4800000	USD
CY2022Q1	us-gaap	Increase Decrease In Trading Securities IncreaseDecreaseInTradingSecurities	0	USD
CY2021Q1	wtm	Proceeds From Maturities Of Trading Fixed Maturity And Convertible Fixed Maturity Investments ProceedsFromMaturitiesOfTradingFixedMaturityAndConvertibleFixedMaturityInvestments	31400000	USD
CY2022Q1	us-gaap	Payments For Proceeds From Short Term Investments PaymentsForProceedsFromShortTermInvestments	-144500000	USD
CY2021Q1	us-gaap	Payments For Proceeds From Short Term Investments PaymentsForProceedsFromShortTermInvestments	103100000	USD
CY2021Q1	us-gaap	Increase Decrease In Trading Securities IncreaseDecreaseInTradingSecurities	11000000.0	USD
CY2022Q1	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	63400000	USD
CY2021Q1	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	34700000	USD
CY2022Q1	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	-41500000	USD
CY2021Q1	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	-92800000	USD
CY2022Q1	wtm	Proceeds From Sale Of Trading Fixed Maturity And Convertible Fixed Maturity Investments ProceedsFromSaleOfTradingFixedMaturityAndConvertibleFixedMaturityInvestments	86500000	USD
CY2021Q1	wtm	Proceeds From Sale Of Trading Fixed Maturity And Convertible Fixed Maturity Investments ProceedsFromSaleOfTradingFixedMaturityAndConvertibleFixedMaturityInvestments	97800000	USD
CY2022Q1	wtm	Proceeds From Maturities Of Trading Fixed Maturity And Convertible Fixed Maturity Investments ProceedsFromMaturitiesOfTradingFixedMaturityAndConvertibleFixedMaturityInvestments	39000000.0	USD
CY2022Q1	wtm	Proceeds From Sale Of Trading Common Equity Securities ProceedsFromSaleOfTradingCommonEquitySecurities	0	USD
CY2021Q1	wtm	Proceeds From Sale Of Trading Common Equity Securities ProceedsFromSaleOfTradingCommonEquitySecurities	160300000	USD
CY2022Q1	us-gaap	Proceeds From Sale And Maturity Of Other Investments ProceedsFromSaleAndMaturityOfOtherInvestments	39800000	USD
CY2021Q1	us-gaap	Proceeds From Sale And Maturity Of Other Investments ProceedsFromSaleAndMaturityOfOtherInvestments	40100000	USD
CY2022Q1	wtm	Proceeds From Release Of Cash Placed In Escrow ProceedsFromReleaseOfCashPlacedInEscrow	0	USD
CY2021Q1	wtm	Proceeds From Release Of Cash Placed In Escrow ProceedsFromReleaseOfCashPlacedInEscrow	646300000	USD
CY2022Q1	us-gaap	Cash Acquired From Acquisition CashAcquiredFromAcquisition	0	USD
CY2021Q1	us-gaap	Cash Acquired From Acquisition CashAcquiredFromAcquisition	52000000.0	USD
CY2022Q1	us-gaap	Payments For Proceeds From Businesses And Interest In Affiliates PaymentsForProceedsFromBusinessesAndInterestInAffiliates	0	USD
CY2021Q1	us-gaap	Payments For Proceeds From Businesses And Interest In Affiliates PaymentsForProceedsFromBusinessesAndInterestInAffiliates	-11100000	USD
CY2022Q1	us-gaap	Payments To Acquire Other Investments PaymentsToAcquireOtherInvestments	21400000	USD
CY2021Q1	us-gaap	Payments To Acquire Other Investments PaymentsToAcquireOtherInvestments	101000000.0	USD
CY2022Q1	wtm	Payments To Acquire Trading Common Equity Securities PaymentsToAcquireTradingCommonEquitySecurities	38000000.0	USD
CY2021Q1	wtm	Payments To Acquire Trading Common Equity Securities PaymentsToAcquireTradingCommonEquitySecurities	68800000	USD
CY2022Q1	wtm	Payments To Acquire Trading Fixed Maturity And Convertible Fixed Maturity Investments PaymentsToAcquireTradingFixedMaturityAndConvertibleFixedMaturityInvestments	115000000.0	USD
CY2021Q1	wtm	Payments To Acquire Trading Fixed Maturity And Convertible Fixed Maturity Investments PaymentsToAcquireTradingFixedMaturityAndConvertibleFixedMaturityInvestments	411100000	USD
CY2022Q1	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-4400000	USD
CY2021Q1	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-60900000	USD
CY2022Q1	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	139800000	USD
CY2021Q1	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	363900000	USD
CY2022Q1	us-gaap	Proceeds From Lines Of Credit ProceedsFromLinesOfCredit	15000000.0	USD
CY2022Q1	us-gaap	Repayments Of Debt RepaymentsOfDebt	14800000	USD
CY2021Q1	us-gaap	Repayments Of Debt RepaymentsOfDebt	93700000	USD
CY2022Q1	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	3000000.0	USD
CY2021Q1	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	3100000	USD
CY2022Q1	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	34800000	USD
CY2021Q1	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	0	USD
CY2022Q1	us-gaap	Proceeds From Payments To Minority Shareholders ProceedsFromPaymentsToMinorityShareholders	300000	USD
CY2021Q1	us-gaap	Proceeds From Payments To Minority Shareholders ProceedsFromPaymentsToMinorityShareholders	-1300000	USD
CY2022Q1	us-gaap	Payment For Contingent Consideration Liability Financing Activities PaymentForContingentConsiderationLiabilityFinancingActivities	0	USD
CY2021Q1	us-gaap	Payment For Contingent Consideration Liability Financing Activities PaymentForContingentConsiderationLiabilityFinancingActivities	6700000	USD
CY2022Q1	wtm	Members Capital Contribution MembersCapitalContribution	12300000	USD
CY2021Q1	wtm	Members Capital Contribution MembersCapitalContribution	13800000	USD
CY2022Q1	wtm	Fidus Re Premium Payment FidusRePremiumPayment	1900000	USD
CY2021Q1	wtm	Fidus Re Premium Payment FidusRePremiumPayment	3200000	USD
CY2022Q1	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-4200000	USD
CY2021Q1	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-4600000	USD
CY2021Q1	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	21000000.0	USD
CY2022Q1	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-31100000	USD
CY2021Q1	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	6500000	USD
CY2022Q1	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	600000	USD
CY2021Q1	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	-300000	USD
CY2022Q1	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	67800000	USD
CY2021Q1	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	277300000	USD
CY2021Q4	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	89200000	USD
CY2020Q4	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	78400000	USD
CY2021Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	259300000	USD
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	211200000	USD
CY2022Q1	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	94700000	USD
CY2021Q1	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	83200000	USD
CY2022Q1	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	327100000	USD
CY2021Q1	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	488500000	USD
CY2022Q1	us-gaap	Interest Paid Net InterestPaidNet	8400000	USD
CY2021Q1	us-gaap	Interest Paid Net InterestPaidNet	7500000	USD
CY2022Q1	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	300000	USD
CY2021Q1	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	1400000	USD
CY2022Q1	wtm	Investment Owned Increase Decrease In Value Book Value Per Share InvestmentOwnedIncreaseDecreaseInValueBookValuePerShare	5.65
CY2022Q1	wtm	Change In Fair Value Of Contingent Earnout Liability Expense Revenue Recognized ChangeInFairValueOfContingentEarnoutLiabilityExpenseRevenueRecognized	100000	USD
CY2022Q1	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	21000000.0	USD
CY2022Q1	us-gaap	Unrealized Gain Loss On Investments UnrealizedGainLossOnInvestments	-9100000	USD
CY2022Q1	us-gaap	Investment Income Investment Expense InvestmentIncomeInvestmentExpense	400000	USD
CY2021Q1	us-gaap	Investment Income Investment Expense InvestmentIncomeInvestmentExpense	400000	USD
CY2022Q1	us-gaap	Net Investment Income NetInvestmentIncome	20600000	USD
CY2021Q1	us-gaap	Net Investment Income NetInvestmentIncome	20600000	USD
CY2022Q1	us-gaap	Realized Investment Gains Losses RealizedInvestmentGainsLosses	17400000	USD
CY2021Q1	us-gaap	Realized Investment Gains Losses RealizedInvestmentGainsLosses	143000000.0	USD
CY2021Q1	us-gaap	Unrealized Gain Loss On Investments UnrealizedGainLossOnInvestments	-182300000	USD
CY2022Q1	wtm	Gain Loss On Investments Exchange Rate Effect GainLossOnInvestmentsExchangeRateEffect	2600000	USD
CY2021Q1	wtm	Gain Loss On Investments Exchange Rate Effect GainLossOnInvestmentsExchangeRateEffect	-200000	USD
CY2022Q1	us-gaap	Sublease Income SubleaseIncome	200000	USD
CY2022Q1	us-gaap	Held To Maturity Securities Debt Maturities Single Maturity Date Amortized Cost Basis HeldToMaturitySecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasis	1881700000	USD
CY2022Q1	us-gaap	Held To Maturity Securities Debt Maturities Single Maturity Date Fair Value HeldToMaturitySecuritiesDebtMaturitiesSingleMaturityDateFairValue	1815500000	USD
CY2022Q1	wtm	Percentage Of Investments Recorded At Fair Value PercentageOfInvestmentsRecordedAtFairValue	0.66
CY2021	wtm	Percentage Of Investments Recorded At Fair Value PercentageOfInvestmentsRecordedAtFairValue	0.68
CY2022Q1	wtm	Investments Held In Trusts InvestmentsHeldInTrusts	463700000	USD
CY2021Q4	wtm	Investments Held In Trusts InvestmentsHeldInTrusts	479500000	USD
CY2022Q1	us-gaap	Assets Held By Insurance Regulators AssetsHeldByInsuranceRegulators	4800000	USD
CY2021Q4	us-gaap	Assets Held By Insurance Regulators AssetsHeldByInsuranceRegulators	4800000	USD
CY2022Q1	us-gaap	Other Long Term Investments OtherLongTermInvestments	1428500000	USD
CY2021Q4	us-gaap	Other Long Term Investments OtherLongTermInvestments	1377800000	USD
CY2022Q1	us-gaap	Goodwill Fair Value Disclosure GoodwillFairValueDisclosure	671600000	USD
CY2022Q1	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	30200000	USD
CY2022Q1	us-gaap	Goodwill Goodwill	641400000	USD
CY2021Q4	us-gaap	Goodwill Fair Value Disclosure GoodwillFairValueDisclosure	675700000	USD
CY2021	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	30200000	USD
CY2021Q4	us-gaap	Goodwill Goodwill	645500000	USD
CY2021Q1	wtm	Disposal Group Held For Sale Remeasurement Loss DisposalGroupHeldForSaleRemeasurementLoss	28700000	USD
CY2022Q1	us-gaap	Schedule Of Liability For Unpaid Claims And Claims Adjustment Expense ScheduleOfLiabilityForUnpaidClaimsAndClaimsAdjustmentExpense	<div style="text-indent:18pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">The following table summarizes the loss and LAE reserve activity of Ark’s insurance and reinsurance subsidiaries for the three months ended March 31, 2022 and 2021:</span></div><div><span><br/></span></div><div style="text-align:center"><table style="border-collapse:collapse;display:inline-table;margin-bottom:5pt;vertical-align:text-bottom;width:87.426%"><tr><td style="width:1.0%"/><td style="width:64.953%"/><td style="width:0.1%"/><td style="width:0.1%"/><td style="width:0.636%"/><td style="width:0.1%"/><td style="width:1.0%"/><td style="width:15.120%"/><td style="width:0.1%"/><td style="width:0.1%"/><td style="width:0.468%"/><td style="width:0.1%"/><td style="width:1.0%"/><td style="width:15.123%"/><td style="width:0.1%"/></tr><tr><td colspan="3" style="border-top:1pt solid #000;padding:0 1pt"/><td colspan="3" style="border-top:1pt solid #000;padding:0 1pt"/><td colspan="9" style="border-top:1pt solid #000;padding:2px 1pt;text-align:center;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:700;line-height:100%">Three Months Ended March 31,</span></td></tr><tr><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:700;line-height:100%">Millions</span></td><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="border-top:1pt solid #000;padding:2px 1pt;text-align:center;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:100%">2022</span></td><td colspan="3" style="border-top:1pt solid #000;padding:0 1pt"/><td colspan="3" style="border-top:1pt solid #000;padding:2px 1pt;text-align:center;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:100%">2021</span></td></tr><tr><td colspan="3" style="border-top:1pt solid #000;padding:2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%">Gross beginning balance</span></td><td colspan="3" style="padding:0 1pt"/><td style="border-top:1pt solid #000;padding:2px 0 2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:100%">$</span></td><td style="border-top:1pt solid #000;padding:2px 0;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:100%">894.7</span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%"> </span></td><td style="border-top:1pt solid #000;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/><td colspan="3" style="padding:0 1pt"/><td style="border-top:1pt solid #000;padding:2px 0 2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%">$</span></td><td style="border-top:1pt solid #000;padding:2px 0;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%">696.0 </span></td><td style="border-top:1pt solid #000;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/></tr><tr><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:bottom"><div><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%">Less: beginning reinsurance recoverable on unpaid losses </span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:6.5pt;font-weight:400;line-height:100%;position:relative;top:-3.5pt;vertical-align:baseline">(1)</span></div></td><td colspan="3" style="padding:0 1pt"/><td colspan="2" style="padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:100%">(428.9)</span></td><td style="padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/><td colspan="3" style="padding:0 1pt"/><td colspan="2" style="padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%">(433.4)</span></td><td style="padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/></tr><tr><td colspan="3" style="padding:2px 1pt 2px 13pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%">Net loss and loss adjustment expense reserves</span></td><td colspan="3" style="padding:0 1pt"/><td colspan="2" style="border-top:1pt solid #000;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:100%">465.8</span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%"> </span></td><td style="border-top:1pt solid #000;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/><td colspan="3" style="padding:0 1pt"/><td colspan="2" style="border-top:1pt solid #000;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%">262.6 </span></td><td style="border-top:1pt solid #000;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/></tr><tr style="height:3pt"><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="padding:0 1pt"/></tr><tr><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%">Loss and loss adjustment expenses incurred relating to:</span></td><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="padding:0 1pt"/></tr><tr><td colspan="3" style="padding:2px 1pt 2px 13pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%">Current year losses</span></td><td colspan="3" style="padding:0 1pt"/><td colspan="2" style="padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:100%">125.7</span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%"> </span></td><td style="padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/><td colspan="3" style="padding:0 1pt"/><td colspan="2" style="padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%">65.5 </span></td><td style="padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/></tr><tr><td colspan="3" style="padding:2px 1pt 2px 13pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%">Prior year losses</span></td><td colspan="3" style="padding:0 1pt"/><td colspan="2" style="padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:100%">(3.7)</span></td><td style="padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/><td colspan="3" style="padding:0 1pt"/><td colspan="2" style="padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%">.5 </span></td><td style="padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/></tr><tr><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%">Net incurred losses and loss adjustment expenses</span></td><td colspan="3" style="padding:0 1pt"/><td colspan="2" style="border-top:1pt solid #000;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:100%">122.0</span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%"> </span></td><td style="border-top:1pt solid #000;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/><td colspan="3" style="padding:0 1pt"/><td colspan="2" style="border-top:1pt solid #000;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%">66.0 </span></td><td style="border-top:1pt solid #000;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/></tr><tr><td colspan="3" style="display:none"/><td colspan="3" style="display:none"/><td colspan="3" style="display:none"/><td colspan="3" style="display:none"/><td colspan="3" style="display:none"/></tr><tr><td colspan="3" style="display:none"/><td colspan="3" style="display:none"/><td colspan="3" style="display:none"/><td colspan="3" style="display:none"/><td colspan="3" style="display:none"/></tr><tr style="height:3pt"><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="padding:0 1pt"/></tr><tr><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%">Loss and loss adjustment expenses paid relating to:</span></td><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="padding:0 1pt"/></tr><tr><td colspan="3" style="padding:2px 1pt 2px 13pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%">Current year losses</span></td><td colspan="3" style="padding:0 1pt"/><td colspan="2" style="padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:100%">(0.6)</span></td><td style="padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/><td colspan="3" style="padding:0 1pt"/><td colspan="2" style="padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%">(5.2)</span></td><td style="padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/></tr><tr><td colspan="3" style="padding:2px 1pt 2px 13pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%">Prior year losses</span></td><td colspan="3" style="padding:0 1pt"/><td colspan="2" style="padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:100%">(39.4)</span></td><td style="padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/><td colspan="3" style="padding:0 1pt"/><td colspan="2" style="padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%">(19.7)</span></td><td style="padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/></tr><tr><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%">Net loss and loss adjustment expenses</span></td><td colspan="3" style="padding:0 1pt"/><td colspan="2" style="border-top:1pt solid #000;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:100%">(40.0)</span></td><td style="border-top:1pt solid #000;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/><td colspan="3" style="padding:0 1pt"/><td colspan="2" style="border-top:1pt solid #000;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%">(24.9)</span></td><td style="border-top:1pt solid #000;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/></tr><tr style="height:3pt"><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="padding:0 1pt"/></tr><tr><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%">Change in TPC Providers’ participation</span></td><td colspan="3" style="padding:0 1pt"/><td colspan="2" style="padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:100%">57.5</span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%"> </span></td><td style="padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/><td colspan="3" style="padding:0 1pt"/><td colspan="2" style="padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%">(2.2)</span></td><td style="padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/></tr><tr><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%">Foreign currency translation and other adjustments<br/>to loss and loss adjustment expense reserves</span></td><td colspan="3" style="padding:0 1pt"/><td colspan="2" style="padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:100%">(1.7)</span></td><td style="padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/><td colspan="3" style="padding:0 1pt"/><td colspan="2" style="padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%">2.9 </span></td><td style="padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/></tr><tr style="height:3pt"><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="padding:0 1pt"/></tr><tr><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%">Net ending balance</span></td><td colspan="3" style="padding:0 1pt"/><td colspan="2" style="padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:100%">603.6</span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%"> </span></td><td style="padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/><td colspan="3" style="padding:0 1pt"/><td colspan="2" style="padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%">304.4 </span></td><td style="padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/></tr><tr><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:bottom"><div style="padding-left:6pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%">Plus: ending reinsurance recoverable on unpaid losses </span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:6.5pt;font-weight:400;line-height:100%;position:relative;top:-3.5pt;vertical-align:baseline">(2)</span></div></td><td colspan="3" style="padding:0 1pt"/><td colspan="2" style="padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:100%">396.0</span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%"> </span></td><td style="padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/><td colspan="3" style="padding:0 1pt"/><td colspan="2" style="padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%">447.5 </span></td><td style="padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/></tr><tr><td colspan="3" style="border-bottom:3pt double #000;padding:2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%">Gross ending balance</span></td><td colspan="3" style="border-bottom:3pt double #000;padding:0 1pt"/><td style="border-bottom:3pt double #000;border-top:1pt solid #000;padding:2px 0 2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:100%">$</span></td><td style="border-bottom:3pt double #000;border-top:1pt solid #000;padding:2px 0;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:100%">999.6</span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%"> </span></td><td style="border-bottom:3pt double #000;border-top:1pt solid #000;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/><td colspan="3" style="border-bottom:3pt double #000;padding:0 1pt"/><td style="border-bottom:3pt double #000;border-top:1pt solid #000;padding:2px 0 2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%">$</span></td><td style="border-bottom:3pt double #000;border-top:1pt solid #000;padding:2px 0;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%">751.9 </span></td><td style="border-bottom:3pt double #000;border-top:1pt solid #000;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/></tr></table></div><div style="margin-top:3pt;padding-left:40.5pt;padding-right:31.5pt;text-indent:-9pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:5.2pt;font-weight:400;line-height:120%;position:relative;top:-2.8pt;vertical-align:baseline">(1)</span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:400;line-height:120%"> The beginning reinsurance recoverable on unpaid losses includes amounts attributable to TPC Providers of $276.8 and $319.2.</span></div><div style="padding-left:40.5pt;padding-right:31.5pt;text-indent:-9pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:5.2pt;font-weight:400;line-height:120%;position:relative;top:-2.8pt;vertical-align:baseline">(2)</span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:400;line-height:120%"> The ending reinsurance recoverable on unpaid losses includes amounts attributable to TPC Providers of $207.3 and $331.0.</span></div>
CY2021Q4	us-gaap	Liability For Claims And Claims Adjustment Expense LiabilityForClaimsAndClaimsAdjustmentExpense	894700000	USD
CY2020Q4	us-gaap	Liability For Claims And Claims Adjustment Expense LiabilityForClaimsAndClaimsAdjustmentExpense	696000000.0	USD
CY2021Q4	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Opening Balance Adjustments LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseOpeningBalanceAdjustments	428900000	USD
CY2020Q4	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Opening Balance Adjustments LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseOpeningBalanceAdjustments	433400000	USD
CY2021Q4	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Net LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet	465800000	USD
CY2020Q4	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Net LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet	262600000	USD
CY2022Q1	us-gaap	Supplemental Information For Property Casualty Insurance Underwriters Current Year Claims And Claims Adjustment Expense SupplementalInformationForPropertyCasualtyInsuranceUnderwritersCurrentYearClaimsAndClaimsAdjustmentExpense	125700000	USD
CY2021Q1	us-gaap	Supplemental Information For Property Casualty Insurance Underwriters Current Year Claims And Claims Adjustment Expense SupplementalInformationForPropertyCasualtyInsuranceUnderwritersCurrentYearClaimsAndClaimsAdjustmentExpense	65500000	USD
CY2022Q1	us-gaap	Supplemental Information For Property Casualty Insurance Underwriters Prior Year Claims And Claims Adjustment Expense SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense	-3700000	USD
CY2021Q1	us-gaap	Supplemental Information For Property Casualty Insurance Underwriters Prior Year Claims And Claims Adjustment Expense SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense	500000	USD
CY2022Q1	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Incurred Claims1 LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1	122000000.0	USD
CY2021Q1	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Incurred Claims1 LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1	66000000.0	USD
CY2022Q1	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Claims Paid Current Year1 LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidCurrentYear1	600000	USD
CY2021Q1	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Claims Paid Current Year1 LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidCurrentYear1	5200000	USD
CY2022Q1	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Claims Paid Prior Years1 LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidPriorYears1	39400000	USD
CY2021Q1	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Claims Paid Prior Years1 LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidPriorYears1	19700000	USD
CY2022Q1	us-gaap	Payments For Losses And Loss Adjustment Expense PaymentsForLossesAndLossAdjustmentExpense	40000000.0	USD
CY2021Q1	us-gaap	Payments For Losses And Loss Adjustment Expense PaymentsForLossesAndLossAdjustmentExpense	24900000	USD
CY2022Q1	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Period Increase Decrease LiabilityForUnpaidClaimsAndClaimsAdjustmentExpensePeriodIncreaseDecrease	57500000	USD
CY2021Q1	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Period Increase Decrease LiabilityForUnpaidClaimsAndClaimsAdjustmentExpensePeriodIncreaseDecrease	-2200000	USD
CY2022Q1	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Foreign Currency Translation Gain Loss LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseForeignCurrencyTranslationGainLoss	-1700000	USD
CY2021Q1	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Foreign Currency Translation Gain Loss LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseForeignCurrencyTranslationGainLoss	2900000	USD
CY2022Q1	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Net LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet	603600000	USD
CY2021Q1	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Net LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet	304400000	USD
CY2022Q1	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Opening Balance Adjustments LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseOpeningBalanceAdjustments	396000000.0	USD
CY2021Q1	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Opening Balance Adjustments LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseOpeningBalanceAdjustments	447500000	USD
CY2022Q1	us-gaap	Liability For Claims And Claims Adjustment Expense LiabilityForClaimsAndClaimsAdjustmentExpense	999600000	USD
CY2021Q1	us-gaap	Liability For Claims And Claims Adjustment Expense LiabilityForClaimsAndClaimsAdjustmentExpense	751900000	USD
CY2022Q1	us-gaap	Supplemental Information For Property Casualty Insurance Underwriters Prior Year Claims And Claims Adjustment Expense SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense	-3700000	USD
CY2022Q1	us-gaap	Reinsurance Recoverables On Unpaid Losses Gross ReinsuranceRecoverablesOnUnpaidLossesGross	396000000	USD
CY2022Q1	us-gaap	Reinsurance Recoverables On Paid Losses Gross ReinsuranceRecoverablesOnPaidLossesGross	16700000	USD
CY2022Q1	us-gaap	Long Term Debt LongTermDebt	690900000	USD
CY2021Q4	us-gaap	Long Term Debt LongTermDebt	693000000.0	USD
CY2022Q1	wtm	Debt Weighted Average Interest Rate Excluding Amortization Of Debt Issuance Costs DebtWeightedAverageInterestRateExcludingAmortizationOfDebtIssuanceCosts	0.061
CY2021	wtm	Debt Weighted Average Interest Rate Excluding Amortization Of Debt Issuance Costs DebtWeightedAverageInterestRateExcludingAmortizationOfDebtIssuanceCosts	0.065
CY2022Q1	wtm	Debt Covenant Loan To Value Maximum Percent Period One DebtCovenantLoanToValueMaximumPercentPeriodOne	0.50
CY2022Q1	wtm	Debt Covenant Loan To Value Maximum Percent Period Two DebtCovenantLoanToValueMaximumPercentPeriodTwo	0.40
CY2022Q1	wtm	Debt Covenant Loan To Value Maximum Percent Period Three DebtCovenantLoanToValueMaximumPercentPeriodThree	0.25
CY2022Q1	wtm	Debt Covenant Loan To Value Maximum Percent Period Four DebtCovenantLoanToValueMaximumPercentPeriodFour	0.15
CY2022Q1	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	33400000	USD
CY2021Q1	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	-94000000.0	USD
CY2022Q1	wtm	Debt Covenant Loan To Value Maximum Percent Period Five DebtCovenantLoanToValueMaximumPercentPeriodFive	0
CY2022Q1	wtm	Debt Covenant Loan To Value Maximum Percent DebtCovenantLoanToValueMaximumPercent	0.33
CY2022Q1	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.311
CY2021Q1	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.069
CY2022Q1	wtm	Percentageof Risk Premium Ceded PercentageofRiskPremiumCeded	0.60
CY2018Q2	wtm	Insurance Linked Securities Term InsuranceLinkedSecuritiesTerm	P12Y
CY2018Q2	wtm	Insurance Linked Securities Callable Term InsuranceLinkedSecuritiesCallableTerm	P5Y
CY2021Q1	wtm	Insurance Linked Securities Term InsuranceLinkedSecuritiesTerm	P12Y
CY2021Q1	wtm	Insurance Linked Securities Callable Term InsuranceLinkedSecuritiesCallableTerm	P5Y
CY2022Q1	wtm	Income Loss Allocated To Participating Unvested Restricted Common Shares IncomeLossAllocatedToParticipatingUnvestedRestrictedCommonShares	-300000	USD
CY2021Q1	wtm	Income Loss Allocated To Participating Unvested Restricted Common Shares IncomeLossAllocatedToParticipatingUnvestedRestrictedCommonShares	900000	USD
CY2022Q1	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	33400000	USD
CY2021Q1	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	-75300000	USD
CY2022Q1	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	0	USD
CY2021Q1	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	18700000	USD
CY2022Q1	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	3006200	shares
CY2021Q1	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	3100200	shares
CY2022Q1	us-gaap	Weighted Average Number Of Shares Restricted Stock WeightedAverageNumberOfSharesRestrictedStock	29600	shares
CY2022Q1	wtm	Net Income Loss Attributableto Parent Basicand Diluted Earnings Per Share Numerators NetIncomeLossAttributabletoParentBasicandDilutedEarningsPerShareNumerators	33100000	USD
CY2021Q1	wtm	Net Income Loss Attributableto Parent Basicand Diluted Earnings Per Share Numerators NetIncomeLossAttributabletoParentBasicandDilutedEarningsPerShareNumerators	-93100000	USD
CY2022Q1	us-gaap	Weighted Average Number Of Shares Issued Basic WeightedAverageNumberOfSharesIssuedBasic	3006200	shares
CY2021Q1	us-gaap	Weighted Average Number Of Shares Issued Basic WeightedAverageNumberOfSharesIssuedBasic	3100200	shares
CY2022Q1	us-gaap	Weighted Average Number Of Shares Restricted Stock WeightedAverageNumberOfSharesRestrictedStock	29600	shares
CY2021Q1	us-gaap	Weighted Average Number Of Shares Restricted Stock WeightedAverageNumberOfSharesRestrictedStock	32400	shares
CY2022Q1	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	2976600	shares
CY2021Q1	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	3067800	shares
CY2021Q1	us-gaap	Weighted Average Number Of Shares Restricted Stock WeightedAverageNumberOfSharesRestrictedStock	32400	shares
CY2022Q1	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	2976600	shares
CY2021Q1	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	3067800	shares
CY2022Q1	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	1.00
CY2021Q1	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	1.00
CY2022Q1	us-gaap	Earnings Per Share Diluted Undistributed EarningsPerShareDilutedUndistributed	10.10
CY2021Q1	us-gaap	Earnings Per Share Diluted Undistributed EarningsPerShareDilutedUndistributed	-31.33
CY2022Q1	us-gaap	Earnings Per Share Basic And Diluted EarningsPerShareBasicAndDiluted	11.10
CY2021Q1	us-gaap	Earnings Per Share Basic And Diluted EarningsPerShareBasicAndDiluted	-30.33
CY2022Q1	wtm	Net Income Loss Attributableto Parent Netof Restricted Common Share Amounts NetIncomeLossAttributabletoParentNetofRestrictedCommonShareAmounts	33100000	USD
CY2021Q1	wtm	Net Income Loss Attributableto Parent Netof Restricted Common Share Amounts NetIncomeLossAttributabletoParentNetofRestrictedCommonShareAmounts	-93100000	USD
CY2022Q1	us-gaap	Dividends Dividends	3000000.0	USD
CY2021Q1	us-gaap	Dividends Dividends	3100000	USD
CY2022Q1	us-gaap	Undistributed Earnings UndistributedEarnings	30100000	USD
CY2021Q1	us-gaap	Undistributed Earnings UndistributedEarnings	-96200000	USD
CY2022Q1	wtm	Commission Revenue CommissionRevenue	73000000.0	USD
CY2022Q1	us-gaap	Other Income OtherIncome	42100000	USD
CY2022Q1	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	41600000	USD
CY2021Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	42200000	USD
CY2022Q1	us-gaap	Operating Lease Liability OperatingLeaseLiability	44800000	USD
CY2021Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	45200000	USD
CY2022Q1	us-gaap	Operating Lease Cost OperatingLeaseCost	2800000	USD
CY2021Q1	us-gaap	Operating Lease Cost OperatingLeaseCost	1900000	USD
CY2021Q1	us-gaap	Sublease Income SubleaseIncome	100000	USD
CY2022Q1	us-gaap	Lease Cost LeaseCost	2600000	USD
CY2021Q1	us-gaap	Lease Cost LeaseCost	1800000	USD
CY2022Q1	us-gaap	Lessee Operating Lease Liability Payments Remainder Of Fiscal Year LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear	7600000	USD
CY2022Q1	us-gaap	Lessee Operating Lease Liability Payments Due Next Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths	11500000	USD
CY2022Q1	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	10000000.0	USD
CY2022Q1	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	6800000	USD
CY2022Q1	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	4300000	USD
CY2022Q1	wtm	Lessee Operating Lease Liabilitytobe Paid After Year Four LesseeOperatingLeaseLiabilitytobePaidAfterYearFour	11800000	USD
CY2022Q1	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	52000000.0	USD
CY2022Q1	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	7200000	USD
CY2022Q1	us-gaap	Operating Lease Liability OperatingLeaseLiability	44800000	USD
CY2022Q1	us-gaap	Operating Lease Liability OperatingLeaseLiability	44800000	USD
CY2021Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	42200000	USD
CY2021Q1	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	83600000	USD
CY2021Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.050
CY2021Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.050
CY2022Q1	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	41600000	USD
CY2022Q1	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.051
CY2021Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	45200000	USD
CY2022Q1	us-gaap	Minority Interest MinorityInterest	127200000	USD
CY2021Q4	us-gaap	Minority Interest MinorityInterest	156600000	USD
CY2022Q1	us-gaap	Number Of Operating Segments NumberOfOperatingSegments	5	segment
CY2022Q1	us-gaap	Premiums Earned Net PremiumsEarnedNet	202800000	USD
CY2022Q1	us-gaap	Net Investment Income NetInvestmentIncome	20600000	USD
CY2022Q1	wtm	Gain Loss On Investments Net Of Tax GainLossOnInvestmentsNetOfTax	-8400000	USD
CY2022Q1	us-gaap	Revenues Revenues	348900000	USD
CY2022Q1	wtm	Insurance Loss And Loss Adjustments Expense InsuranceLossAndLossAdjustmentsExpense	122000000.0	USD
CY2022Q1	wtm	Insurance And Reinsurance Acquisition Expenses InsuranceAndReinsuranceAcquisitionExpenses	52900000	USD
CY2022Q1	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	21400000	USD
CY2022Q1	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	125000000.0	USD
CY2022Q1	wtm	Broker Commission Expense BrokerCommissionExpense	20600000	USD
CY2022Q1	us-gaap	Business Combination Contingent Consideration Arrangements Change In Amount Of Contingent Consideration Liability1 BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1	100000	USD
CY2022Q1	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	10100000	USD
CY2022Q1	us-gaap	Gain Loss On Disposition Of Assets1 GainLossOnDispositionOfAssets1	0	USD
CY2022Q1	us-gaap	Interest Expense Debt InterestExpenseDebt	9000000.0	USD
CY2022Q1	us-gaap	Benefits Losses And Expenses BenefitsLossesAndExpenses	361100000	USD
CY2022Q1	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	-12200000	USD
CY2021Q1	us-gaap	Premiums Earned Net PremiumsEarnedNet	111000000.0	USD
CY2021Q1	us-gaap	Net Investment Income NetInvestmentIncome	20600000	USD
CY2021Q1	wtm	Gain Loss On Investments Net Of Tax GainLossOnInvestmentsNetOfTax	1100000	USD
CY2021Q1	wtm	Commission Revenue CommissionRevenue	61900000	USD
CY2021Q1	us-gaap	Other Income OtherIncome	25300000	USD
CY2021Q1	us-gaap	Revenues Revenues	178200000	USD
CY2021Q1	wtm	Insurance Loss And Loss Adjustments Expense InsuranceLossAndLossAdjustmentsExpense	66000000.0	USD
CY2021Q1	wtm	Insurance And Reinsurance Acquisition Expenses InsuranceAndReinsuranceAcquisitionExpenses	38600000	USD
CY2021Q1	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	4000000.0	USD
CY2021Q1	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	138400000	USD
CY2021Q1	wtm	Broker Commission Expense BrokerCommissionExpense	18900000	USD
CY2021Q1	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	9200000	USD
CY2021Q1	us-gaap	Gain Loss On Disposition Of Assets1 GainLossOnDispositionOfAssets1	-28700000	USD
CY2021Q1	us-gaap	Interest Expense Debt InterestExpenseDebt	13100000	USD
CY2021Q1	us-gaap	Benefits Losses And Expenses BenefitsLossesAndExpenses	316900000	USD
CY2021Q1	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	-138700000	USD
CY2022Q1	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	117800000	USD
CY2022Q1	wtm	Other Revenue OtherRevenue	231100000	USD
CY2022Q1	us-gaap	Revenues Revenues	348900000	USD
CY2021Q1	wtm	Other Revenue OtherRevenue	94600000	USD
CY2021Q1	us-gaap	Revenues Revenues	178200000	USD
CY2022Q1	us-gaap	Loss Contingency Disclosures LossContingencyDisclosures	Commitments and Contingencies<div><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:120%">Legal Contingencies</span></div><div><span><br/></span></div><div style="text-indent:18pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">White Mountains, and the insurance industry in general, is routinely subject to claims related litigation and arbitration in the normal course of business, as well as litigation and arbitration that do not arise from, nor are directly related to, claims activity. White Mountains’s estimates of the costs of settling matters routinely encountered in claims activity are reflected in the reserves for unpaid loss and LAE. See </span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:120%">Note 5 — “Losses and Loss Adjustment Expense Reserves”</span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">. </span></div>White Mountains considers the requirements of ASC 450 when evaluating its exposure to non-claims related 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 non-claims related litigation that may have a material adverse effect on White Mountains’s financial condition, results of operations or cash flows.

Files In Submission

Name	View Source	Status
0000776867-22-000005-index-headers.html	Edgar Link	pending
0000776867-22-000005-index.html	Edgar Link	pending
0000776867-22-000005.txt	Edgar Link	pending
0000776867-22-000005-xbrl.zip	Edgar Link	pending
exhibit10110-q2022.htm	Edgar Link	pending
exhibit10110-q2022001.jpg	Edgar Link	pending
exhibit10210-q2022.htm	Edgar Link	pending
exhibit10210-q2022001.jpg	Edgar Link	pending
exhibit10210-q2022002.jpg	Edgar Link	pending
exhibit10210-q2022003.jpg	Edgar Link	pending
exhibit10210-q2022004.jpg	Edgar Link	pending
exhibit10210-q2022005.jpg	Edgar Link	pending
exhibit10210-q2022006.jpg	Edgar Link	pending
exhibit10210-q2022007.jpg	Edgar Link	pending
exhibit10210-q2022008.jpg	Edgar Link	pending
exhibit10210-q2022009.jpg	Edgar Link	pending
exhibit10210-q2022010.jpg	Edgar Link	pending
exhibit10210-q2022011.jpg	Edgar Link	pending
exhibit10210-q2022012.jpg	Edgar Link	pending
exhibit10210-q2022013.jpg	Edgar Link	pending
exhibit10210-q2022014.jpg	Edgar Link	pending
exhibit10210-q2022015.jpg	Edgar Link	pending
exhibit10210-q2022016.jpg	Edgar Link	pending
exhibit10210-q2022017.jpg	Edgar Link	pending
exhibit10210-q2022018.jpg	Edgar Link	pending
exhibit10210-q2022019.jpg	Edgar Link	pending
exhibit10210-q2022020.jpg	Edgar Link	pending
exhibit10210-q2022021.jpg	Edgar Link	pending
exhibit10210-q2022022.jpg	Edgar Link	pending
exhibit10210-q2022023.jpg	Edgar Link	pending
exhibit10210-q2022024.jpg	Edgar Link	pending
exhibit10210-q2022025.jpg	Edgar Link	pending
exhibit10210-q2022026.jpg	Edgar Link	pending
exhibit10210-q2022027.jpg	Edgar Link	pending
exhibit10210-q2022028.jpg	Edgar Link	pending
exhibit10210-q2022029.jpg	Edgar Link	pending
exhibit10210-q2022030.jpg	Edgar Link	pending
exhibit10210-q2022031.jpg	Edgar Link	pending
exhibit10210-q2022032.jpg	Edgar Link	pending
exhibit10210-q2022033.jpg	Edgar Link	pending
exhibit10210-q2022034.jpg	Edgar Link	pending
exhibit10210-q2022035.jpg	Edgar Link	pending
exhibit10210-q2022036.jpg	Edgar Link	pending
exhibit10210-q2022037.jpg	Edgar Link	pending
exhibit10210-q2022038.jpg	Edgar Link	pending
exhibit10210-q2022039.jpg	Edgar Link	pending
exhibit10210-q2022040.jpg	Edgar Link	pending
exhibit10210-q2022041.jpg	Edgar Link	pending
exhibit10210-q2022042.jpg	Edgar Link	pending
exhibit10210-q2022043.jpg	Edgar Link	pending
exhibit10210-q2022044.jpg	Edgar Link	pending
exhibit10210-q2022045.jpg	Edgar Link	pending
exhibit10210-q2022046.jpg	Edgar Link	pending
exhibit10210-q2022047.jpg	Edgar Link	pending
exhibit10210-q2022048.jpg	Edgar Link	pending
exhibit10210-q2022049.jpg	Edgar Link	pending
exhibit10210-q2022050.jpg	Edgar Link	pending
exhibit10210-q2022051.jpg	Edgar Link	pending
exhibit10210-q2022052.jpg	Edgar Link	pending
exhibit10210-q2022053.jpg	Edgar Link	pending
exhibit10210-q2022054.jpg	Edgar Link	pending
exhibit10210-q2022055.jpg	Edgar Link	pending
exhibit10210-q2022056.jpg	Edgar Link	pending
exhibit10210-q2022057.jpg	Edgar Link	pending
exhibit10210-q2022058.jpg	Edgar Link	pending
exhibit10210-q2022059.jpg	Edgar Link	pending
exhibit10210-q2022060.jpg	Edgar Link	pending
exhibit10210-q2022061.jpg	Edgar Link	pending
exhibit10210-q2022062.jpg	Edgar Link	pending
exhibit10210-q2022063.jpg	Edgar Link	pending
exhibit10210-q2022064.jpg	Edgar Link	pending
exhibit10210-q2022065.jpg	Edgar Link	pending
exhibit10210-q2022066.jpg	Edgar Link	pending
exhibit10210-q2022067.jpg	Edgar Link	pending
exhibit10210-q2022068.jpg	Edgar Link	pending
exhibit10210-q2022069.jpg	Edgar Link	pending
exhibit10210-q2022070.jpg	Edgar Link	pending
exhibit10210-q2022071.jpg	Edgar Link	pending
exhibit10210-q2022072.jpg	Edgar Link	pending
exhibit10210-q2022073.jpg	Edgar Link	pending
exhibit10210-q2022074.jpg	Edgar Link	pending
exhibit10210-q2022075.jpg	Edgar Link	pending
exhibit10210-q2022076.jpg	Edgar Link	pending
exhibit10210-q2022077.jpg	Edgar Link	pending
exhibit10210-q2022078.jpg	Edgar Link	pending
exhibit10210-q2022079.jpg	Edgar Link	pending
exhibit10210-q2022080.jpg	Edgar Link	pending
exhibit10210-q2022081.jpg	Edgar Link	pending
exhibit10210-q2022082.jpg	Edgar Link	pending
exhibit10210-q2022083.jpg	Edgar Link	pending
exhibit10210-q2022084.jpg	Edgar Link	pending
exhibit10210-q2022085.jpg	Edgar Link	pending
exhibit10210-q2022086.jpg	Edgar Link	pending
FilingSummary.xml	Edgar Link	unprocessable
Financial_Report.xlsx	Edgar Link	pending
MetaLinks.json	Edgar Link	pending
R1.htm	Edgar Link	pending
R10.htm	Edgar Link	pending
R100.htm	Edgar Link	pending
R101.htm	Edgar Link	pending
R102.htm	Edgar Link	pending
R103.htm	Edgar Link	pending
R104.htm	Edgar Link	pending
R105.htm	Edgar Link	pending
R106.htm	Edgar Link	pending
R107.htm	Edgar Link	pending
R108.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
R88.htm	Edgar Link	pending
R89.htm	Edgar Link	pending
R9.htm	Edgar Link	pending
R90.htm	Edgar Link	pending
R91.htm	Edgar Link	pending
R92.htm	Edgar Link	pending
R93.htm	Edgar Link	pending
R94.htm	Edgar Link	pending
R95.htm	Edgar Link	pending
R96.htm	Edgar Link	pending
R97.htm	Edgar Link	pending
R98.htm	Edgar Link	pending
R99.htm	Edgar Link	pending
report.css	Edgar Link	pending
Show.js	Edgar Link	pending
wtm-20220331.htm	Edgar Link	pending
wtm-20220331.xsd	Edgar Link	pending
wtm-20220331_cal.xml	Edgar Link	unprocessable
wtm-20220331_def.xml	Edgar Link	unprocessable
wtm-20220331_htm.xml	Edgar Link	completed
wtm-20220331_lab.xml	Edgar Link	unprocessable
wtm-20220331_pre.xml	Edgar Link	unprocessable
wtmq12022ex311.htm	Edgar Link	pending
wtmq12022ex312.htm	Edgar Link	pending
wtmq12022ex321.htm	Edgar Link	pending
wtmq12022ex322.htm	Edgar Link	pending

Create your account

Find Stocks Worth Researching

Deeply Understand Businesses

Value Businesses Intelligently

$WTM
WHITE MOUNTAINS INSURANCE GROUP LTD Stock $wtm

2022 Q1 Form 10-Q Financial Statement

#000077686722000005 Filed on May 06, 2022

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$WTM WHITE MOUNTAINS INSURANCE GROUP LTD Stock $wtm

2022 Q1 Form 10-Q Financial Statement

#000077686722000005 Filed on May 06, 2022

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$WTM
WHITE MOUNTAINS INSURANCE GROUP LTD Stock $wtm