$WTM
WHITE MOUNTAINS INSURANCE GROUP LTD Stock $wtm

$wtm Overview Financials Valuation SEC Filings Company Website

2024 Q2 Form 10-Q Financial Statement

#000077686724000010 Filed on May 09, 2024

Income Statement

Concept	2024 Q2	2024 Q1	2023 Q1
Revenue	$395.4M	$647.3M	$531.9M
YoY Change	4.49%	21.7%	52.45%
Cost Of Revenue	$7.000M	$7.600M	$13.90M
YoY Change	-39.66%	-45.32%	-35.05%
Gross Profit	$388.4M	$639.7M	$518.0M
YoY Change	5.89%	23.49%	58.17%
Gross Profit Margin	98.23%	98.83%	97.39%
Selling, General & Admin	$142.2M	$142.1M	$109.9M
YoY Change	24.52%	29.3%	18.94%
% of Gross Profit	36.61%	22.21%	21.22%
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$75.90M	$71.60M	-$82.20M
YoY Change	-414.94%	-187.1%	-613.75%
% of Gross Profit	19.54%	11.19%	-15.87%
Operating Expenses	$415.3M	$399.5M	$320.2M
YoY Change	20.52%	24.77%	19.34%
Operating Profit	-$26.90M	$240.2M	$197.8M
YoY Change	-221.17%	21.44%	234.12%
Interest Expense	$14.80M	$15.20M	-$12.60M
YoY Change	-190.24%	-220.63%	82.61%
% of Operating Profit		6.33%	-6.37%
Other Income/Expense, Net
YoY Change
Pretax Income	-$34.70M	$232.6M	$199.1M
YoY Change	-299.43%	16.83%	-1731.97%
Income Tax	$6.500M	$10.80M	$11.90M
% Of Pretax Income		4.64%	5.98%
Net Earnings	-$54.60M	$236.4M	$179.5M
YoY Change	-378.57%	31.7%	437.43%
Net Earnings / Revenue	-13.81%	36.52%	33.75%
Basic Earnings Per Share	-$21.24	$92.33	$69.83
Diluted Earnings Per Share	-$21.24	$92.33	$69.83
COMMON SHARES
Basic Shares Outstanding	2.566M shares	2.555M shares	2.568M shares
Diluted Shares Outstanding	2.532M shares	2.531M shares	2.539M shares

Balance Sheet

Concept	2024 Q2	2024 Q1	2023 Q1
SHORT-TERM ASSETS
Cash & Short-Term Investments
YoY Change
Cash & Equivalents	$255.2M	$225.3M	$202.7M
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	$439.2M	$439.2M	$168.8M
YoY Change	160.19%	160.19%	-73.68%
Intangibles	$291.8M	$297.4M	$207.4M
YoY Change	42.48%	43.39%
Long-Term Investments	$6.439B	$6.328B	$5.435B
YoY Change	14.31%	16.44%	31.4%
Other Assets	$64.10M	$83.00M
YoY Change
Total Long-Term Assets
YoY Change
TOTAL ASSETS
Total Short-Term Assets
Total Long-Term Assets
Total Assets	$10.17B	$9.590B	$7.959B
YoY Change	21.38%	20.49%	8.19%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable
YoY Change
Accrued Expenses	$75.80M	$59.50M	$52.10M
YoY Change	15.37%	14.2%	-35.92%
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	$75.80M	$59.50M	$52.10M
YoY Change	15.37%	14.2%	-35.92%
LONG-TERM LIABILITIES
Long-Term Debt	$530.2M	$532.1M	$556.3M
YoY Change	-6.34%	-4.35%	-19.48%
Other Long-Term Liabilities	$426.5M	$438.2M	$296.0M
YoY Change	57.73%	48.04%	9.51%
Total Long-Term Liabilities	$956.7M	$970.3M	$852.3M
YoY Change	14.37%	13.84%	-11.33%
TOTAL LIABILITIES
Total Short-Term Liabilities	$75.80M	$59.50M	$52.10M
Total Long-Term Liabilities	$956.7M	$970.3M	$852.3M
Total Liabilities	$5.295B	$4.700B	$3.866B
YoY Change	24.57%	21.56%	4.85%
SHAREHOLDERS EQUITY
Retained Earnings	$3.863B	$3.918B	$3.367B
YoY Change	14.27%	16.35%	13.91%
Common Stock	$2.600M	$2.600M	$2.600M
YoY Change	0.0%	0.0%	-13.33%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$4.423B	$4.470B	$3.902B
YoY Change
Total Liabilities & Shareholders Equity	$10.17B	$9.590B	$7.959B
YoY Change	21.38%	20.49%	8.19%

Cashflow Statement

Concept	2024 Q2	2024 Q1	2023 Q1
OPERATING ACTIVITIES
Net Income	-$54.60M	$236.4M	$179.5M
YoY Change	-378.57%	31.7%	437.43%
Depreciation, Depletion And Amortization	$75.90M	$71.60M	-$82.20M
YoY Change	-414.94%	-187.1%	-613.75%
Cash From Operating Activities	$216.8M	$36.50M	$85.60M
YoY Change	204.92%	-57.36%	-306.27%
INVESTING ACTIVITIES
Capital Expenditures
YoY Change
Acquisitions		$231.8M	$0.00
YoY Change
Other Investing Activities	-$194.8M	-$29.20M	$11.20M
YoY Change	54.36%	-360.71%	-354.55%
Cash From Investing Activities	-$194.8M	$100.6M	-$96.60M
YoY Change	54.36%	-204.14%	-169.1%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net		$32.60M	$20.00M
YoY Change		63.0%
Cash From Financing Activities	7.900M	-$34.20M	-$41.30M
YoY Change	14.49%	-17.19%	32.8%
NET CHANGE
Cash From Operating Activities	216.8M	$36.50M	$85.60M
Cash From Investing Activities	-194.8M	$100.6M	-$96.60M
Cash From Financing Activities	7.900M	-$34.20M	-$41.30M
Net Change In Cash	29.90M	$102.9M	-$52.30M
YoY Change	-162.03%	-296.75%	-177.14%
FREE CASH FLOW
Cash From Operating Activities	$216.8M	$36.50M	$85.60M
Capital Expenditures
Free Cash Flow
YoY Change

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2024Q1	us-gaap	Assets Assets	9590300000	usd
CY2023Q4	us-gaap	Assets Assets	8385900000	usd
CY2024Q1	us-gaap	Liabilities Liabilities	4699700000	usd
CY2023Q4	us-gaap	Liabilities Liabilities	3824300000	usd
CY2023Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	1
CY2024Q1	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	1
CY2023Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	50000000	shares
CY2024Q1	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	50000000	shares
CY2024Q1	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	2565733	shares
CY2024Q1	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	2565733	shares
CY2023Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	2560452	shares
CY2023Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	2560452	shares
CY2024Q1	us-gaap	Common Stock Value CommonStockValue	2600000	usd
CY2023Q4	us-gaap	Common Stock Value CommonStockValue	2600000	usd
CY2024Q1	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	551900000	usd
CY2023Q4	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	548700000	usd
CY2024Q1	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	3917700000	usd
CY2023Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	3690800000	usd
CY2024Q1	us-gaap	Accumulated Other Comprehensive Income Loss Foreign Currency Translation Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax	-1800000	usd
CY2023Q4	us-gaap	Accumulated Other Comprehensive Income Loss Foreign Currency Translation Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax	-1600000	usd
CY2024Q1	us-gaap	Stockholders Equity StockholdersEquity	4470400000	usd
CY2023Q4	us-gaap	Stockholders Equity StockholdersEquity	4240500000	usd
CY2024Q1	us-gaap	Minority Interest MinorityInterest	420200000	usd
CY2023Q4	us-gaap	Minority Interest MinorityInterest	321100000	usd
CY2024Q1	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	4890600000	usd
CY2023Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	4561600000	usd
CY2024Q1	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	9590300000	usd
CY2023Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	8385900000	usd
CY2024Q1	us-gaap	Revenues Revenues	647300000	usd
CY2023Q1	us-gaap	Revenues Revenues	531900000	usd
CY2024Q1	us-gaap	Benefits Losses And Expenses BenefitsLossesAndExpenses	414700000	usd
CY2023Q1	us-gaap	Benefits Losses And Expenses BenefitsLossesAndExpenses	332800000	usd
CY2024Q1	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	232600000	usd
CY2023Q1	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	199100000	usd
CY2024Q1	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	10800000	usd
CY2023Q1	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	11900000	usd
CY2024Q1	us-gaap	Profit Loss ProfitLoss	221800000	usd
CY2023Q1	us-gaap	Profit Loss ProfitLoss	187200000	usd
CY2024Q1	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	-14600000	usd
CY2023Q1	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	7700000	usd
CY2024Q1	us-gaap	Net Income Loss NetIncomeLoss	236400000	usd
CY2023Q1	us-gaap	Net Income Loss NetIncomeLoss	179500000	usd
CY2024Q1	us-gaap	Net Income Loss NetIncomeLoss	236400000	usd
CY2023Q1	us-gaap	Net Income Loss NetIncomeLoss	179500000	usd
CY2024Q1	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-300000	usd
CY2023Q1	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	1200000	usd
CY2024Q1	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	236100000	usd
CY2023Q1	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	180700000	usd
CY2024Q1	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Noncontrolling Interest OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest	-100000	usd
CY2023Q1	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Noncontrolling Interest OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest	400000	usd
CY2024Q1	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	236200000	usd
CY2023Q1	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	180300000	usd
CY2024Q1	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	92.33
CY2023Q1	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	69.83
CY2024Q1	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	0
CY2023Q1	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	0
CY2024Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	92.33
CY2023Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	69.83
CY2024Q1	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	92.33
CY2023Q1	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	69.83
CY2024Q1	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	0
CY2023Q1	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	0
CY2024Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	92.33
CY2023Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	69.83
CY2024Q1	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	1.00
CY2024Q1	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	1.00
CY2023Q1	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	1.00
CY2023Q1	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	1.00
CY2024Q1	us-gaap	Profit Loss ProfitLoss	221800000	usd
CY2023Q1	us-gaap	Profit Loss ProfitLoss	187200000	usd
CY2024Q1	us-gaap	Deferred Income Taxes And Tax Credits DeferredIncomeTaxesAndTaxCredits	-9800000	usd
CY2023Q1	us-gaap	Deferred Income Taxes And Tax Credits DeferredIncomeTaxesAndTaxCredits	-3600000	usd
CY2024Q1	us-gaap	Share Based Compensation ShareBasedCompensation	3200000	usd
CY2023Q1	us-gaap	Share Based Compensation ShareBasedCompensation	3100000	usd
CY2024Q1	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	-2100000	usd
CY2023Q1	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	-2400000	usd
CY2024Q1	us-gaap	Business Combination Contingent Consideration Arrangements Change In Amount Of Contingent Consideration Liability1 BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1	0	usd
CY2023Q1	us-gaap	Business Combination Contingent Consideration Arrangements Change In Amount Of Contingent Consideration Liability1 BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1	-2400000	usd
CY2024Q1	us-gaap	Increase Decrease In Reinsurance Recoverable IncreaseDecreaseInReinsuranceRecoverable	253000000.0	usd
CY2023Q1	us-gaap	Increase Decrease In Reinsurance Recoverable IncreaseDecreaseInReinsuranceRecoverable	-24700000	usd
CY2024Q1	us-gaap	Increase Decrease In Premiums Receivable IncreaseDecreaseInPremiumsReceivable	394900000	usd
CY2023Q1	us-gaap	Increase Decrease In Premiums Receivable IncreaseDecreaseInPremiumsReceivable	365300000	usd
CY2024Q1	us-gaap	Increase Decrease In Deferred Policy Acquisition Costs IncreaseDecreaseInDeferredPolicyAcquisitionCosts	68800000	usd
CY2023Q1	us-gaap	Increase Decrease In Deferred Policy Acquisition Costs IncreaseDecreaseInDeferredPolicyAcquisitionCosts	82200000	usd
CY2024Q1	us-gaap	Increase Decrease In Liability For Claims And Claims Adjustment Expense Reserve IncreaseDecreaseInLiabilityForClaimsAndClaimsAdjustmentExpenseReserve	142400000	usd
CY2023Q1	us-gaap	Increase Decrease In Liability For Claims And Claims Adjustment Expense Reserve IncreaseDecreaseInLiabilityForClaimsAndClaimsAdjustmentExpenseReserve	49100000	usd
CY2024Q1	us-gaap	Increase Decrease In Unearned Premiums IncreaseDecreaseInUnearnedPremiums	499400000	usd
CY2023Q1	us-gaap	Increase Decrease In Unearned Premiums IncreaseDecreaseInUnearnedPremiums	501800000	usd
CY2024Q1	us-gaap	Increase Decrease In Reinsurance Payables IncreaseDecreaseInReinsurancePayables	181400000	usd
CY2023Q1	us-gaap	Increase Decrease In Reinsurance Payables IncreaseDecreaseInReinsurancePayables	-58100000	usd
CY2024Q1	wtm	Increase Decrease In Premiums And Commissions Payable IncreaseDecreaseInPremiumsAndCommissionsPayable	12500000	usd
CY2023Q1	wtm	Increase Decrease In Premiums And Commissions Payable IncreaseDecreaseInPremiumsAndCommissionsPayable	0	usd
CY2024Q1	wtm	Payments For Participation Contracts PaymentsForParticipationContracts	0	usd
CY2023Q1	wtm	Payments For Participation Contracts PaymentsForParticipationContracts	30900000	usd
CY2024Q1	wtm	Proceeds From Sale Of Participation Contracts ProceedsFromSaleOfParticipationContracts	0	usd
CY2023Q1	wtm	Proceeds From Sale Of Participation Contracts ProceedsFromSaleOfParticipationContracts	62900000	usd
CY2024Q1	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	68700000	usd
CY2023Q1	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	200000	usd
CY2024Q1	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	36500000	usd
CY2023Q1	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	85600000	usd
CY2024Q1	wtm	Payments For Proceeds From Other Short Term Investments PaymentsForProceedsFromOtherShortTermInvestments	-441300000	usd
CY2023Q1	wtm	Payments For Proceeds From Other Short Term Investments PaymentsForProceedsFromOtherShortTermInvestments	-47600000	usd
CY2024Q1	us-gaap	Proceeds From Sale Of Trading Securities Heldforinvestment ProceedsFromSaleOfTradingSecuritiesHeldforinvestment	185800000	usd
CY2023Q1	us-gaap	Proceeds From Sale Of Trading Securities Heldforinvestment ProceedsFromSaleOfTradingSecuritiesHeldforinvestment	54600000	usd
CY2024Q1	us-gaap	Proceeds From Maturities Repayments And Calls Of Trading Securities Heldforinvestment ProceedsFromMaturitiesRepaymentsAndCallsOfTradingSecuritiesHeldforinvestment	81800000	usd
CY2023Q1	us-gaap	Proceeds From Maturities Repayments And Calls Of Trading Securities Heldforinvestment ProceedsFromMaturitiesRepaymentsAndCallsOfTradingSecuritiesHeldforinvestment	66800000	usd
CY2024Q1	us-gaap	Proceeds From Sale And Maturity Of Other Investments ProceedsFromSaleAndMaturityOfOtherInvestments	91500000	usd
CY2023Q1	us-gaap	Proceeds From Sale And Maturity Of Other Investments ProceedsFromSaleAndMaturityOfOtherInvestments	2000000.0	usd
CY2024Q1	us-gaap	Cash Divested From Deconsolidation CashDivestedFromDeconsolidation	0.0	usd
CY2023Q1	us-gaap	Cash Divested From Deconsolidation CashDivestedFromDeconsolidation	800000	usd
CY2024Q1	us-gaap	Proceeds From Divestiture Of Businesses Net Of Cash Divested ProceedsFromDivestitureOfBusinessesNetOfCashDivested	0	usd
CY2023Q1	us-gaap	Proceeds From Divestiture Of Businesses Net Of Cash Divested ProceedsFromDivestitureOfBusinessesNetOfCashDivested	17300000	usd
CY2024Q1	us-gaap	Cash Acquired From Acquisition CashAcquiredFromAcquisition	44900000	usd
CY2023Q1	us-gaap	Cash Acquired From Acquisition CashAcquiredFromAcquisition	0.0	usd
CY2024Q1	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	231800000	usd
CY2023Q1	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	0	usd
CY2024Q1	wtm	Payments To Acquire Trading Fixed Maturities Investments PaymentsToAcquireTradingFixedMaturitiesInvestments	417300000	usd
CY2023Q1	wtm	Payments To Acquire Trading Fixed Maturities Investments PaymentsToAcquireTradingFixedMaturitiesInvestments	127600000	usd
CY2024Q1	us-gaap	Payments To Acquire Other Investments PaymentsToAcquireOtherInvestments	79900000	usd
CY2023Q1	us-gaap	Payments To Acquire Other Investments PaymentsToAcquireOtherInvestments	146100000	usd
CY2024Q1	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-29200000	usd
CY2023Q1	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	11200000	usd
CY2024Q1	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	100600000	usd
CY2023Q1	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-96600000	usd
CY2024Q1	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	32600000	usd
CY2023Q1	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	20000000.0	usd
CY2024Q1	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	2500000	usd
CY2023Q1	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	2600000	usd
CY2024Q1	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	8100000	usd
CY2023Q1	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	25300000	usd
CY2024Q1	wtm	Proceeds From Member Surplus Contributions ProceedsFromMemberSurplusContributions	11400000	usd
CY2023Q1	wtm	Proceeds From Member Surplus Contributions ProceedsFromMemberSurplusContributions	11800000	usd
CY2024Q1	us-gaap	Proceeds From Payments To Minority Shareholders ProceedsFromPaymentsToMinorityShareholders	1100000	usd
CY2023Q1	us-gaap	Proceeds From Payments To Minority Shareholders ProceedsFromPaymentsToMinorityShareholders	-1700000	usd
CY2024Q1	wtm	Payments For Collateralized Financial Guarantee PaymentsForCollateralizedFinancialGuarantee	3500000	usd
CY2023Q1	wtm	Payments For Collateralized Financial Guarantee PaymentsForCollateralizedFinancialGuarantee	3500000	usd
CY2024Q1	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-34200000	usd
CY2023Q1	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-41300000	usd
CY2024Q1	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect Continuing Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffectContinuingOperations	102900000	usd
CY2023Q1	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect Continuing Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffectContinuingOperations	-52300000	usd
CY2023Q4	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	700000	usd
CY2022Q4	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	12200000	usd
CY2023Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	122400000	usd
CY2022Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	255000000.0	usd
CY2024Q1	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	83000000.0	usd
CY2023Q1	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	13000000.0	usd
CY2024Q1	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	225300000	usd
CY2023Q1	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	202700000	usd
CY2024Q1	us-gaap	Interest Paid Net InterestPaidNet	16700000	usd
CY2023Q1	us-gaap	Interest Paid Net InterestPaidNet	5800000	usd
CY2024Q1	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	5300000	usd
CY2023Q1	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	17800000	usd
CY2024Q1	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	4	segment
CY2024Q1	wtm	Other Long Term Investments Cost OtherLongTermInvestmentsCost	1642200000	usd
CY2024Q1	wtm	Other Long Term Investments Unrealized Gain OtherLongTermInvestmentsUnrealizedGain	466700000	usd
CY2024Q1	wtm	Other Long Term Investments Unrealized Loss OtherLongTermInvestmentsUnrealizedLoss	101100000	usd
CY2024Q1	wtm	Other Long Term Investments Net Foreign Currency Gain Loss OtherLongTermInvestmentsNetForeignCurrencyGainLoss	-15900000	usd
CY2024Q1	us-gaap	Other Long Term Investments OtherLongTermInvestments	1991900000	usd
CY2024Q1	wtm	Management Rollover Shareholders Additional Shares Percentage ManagementRolloverShareholdersAdditionalSharesPercentage	0.125
CY2024Q1	us-gaap	Gross Investment Income Operating GrossInvestmentIncomeOperating	57700000	usd
CY2023Q1	us-gaap	Gross Investment Income Operating GrossInvestmentIncomeOperating	39600000	usd
CY2024Q1	us-gaap	Investment Income Investment Expense InvestmentIncomeInvestmentExpense	700000	usd
CY2023Q1	us-gaap	Investment Income Investment Expense InvestmentIncomeInvestmentExpense	600000	usd
CY2024Q1	us-gaap	Net Investment Income NetInvestmentIncome	57000000.0	usd
CY2023Q1	us-gaap	Net Investment Income NetInvestmentIncome	39000000.0	usd
CY2024Q1	us-gaap	Gain Loss On Investments GainLossOnInvestments	226800000	usd
CY2023Q1	us-gaap	Gain Loss On Investments GainLossOnInvestments	198100000	usd
CY2024Q1	us-gaap	Equity Securities Fv Ni Cost EquitySecuritiesFvNiCost	483500000	usd
CY2024Q1	us-gaap	Equity Securities Fv Ni Unrealized Gain EquitySecuritiesFvNiUnrealizedGain	86000000.0	usd
CY2024Q1	us-gaap	Equity Securities Fv Ni Unrealized Loss EquitySecuritiesFvNiUnrealizedLoss	1200000	usd
CY2024Q1	wtm	Equity Securities Fnni Net Foreign Currency Gain Loss EquitySecuritiesFNNINetForeignCurrencyGainLoss	-6800000	usd
CY2024Q1	us-gaap	Equity Securities Fv Ni Current And Noncurrent EquitySecuritiesFvNiCurrentAndNoncurrent	561500000	usd
CY2023Q4	us-gaap	Equity Securities Fv Ni Cost EquitySecuritiesFvNiCost	483500000	usd
CY2023	us-gaap	Equity Securities Fv Ni Unrealized Gain EquitySecuritiesFvNiUnrealizedGain	62300000	usd
CY2024Q1	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	5700000	usd
CY2024Q1	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	5700000	usd
CY2023Q1	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	1600000	usd
CY2023Q1	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	1600000	usd
CY2024Q1	us-gaap	Goodwill Goodwill	439200000	usd
CY2024Q1	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	297400000	usd
CY2023	us-gaap	Equity Securities Fv Ni Unrealized Loss EquitySecuritiesFvNiUnrealizedLoss	1200000	usd
CY2023	wtm	Equity Securities Fnni Net Foreign Currency Gain Loss EquitySecuritiesFNNINetForeignCurrencyGainLoss	-6200000	usd
CY2023Q4	us-gaap	Equity Securities Fv Ni Current And Noncurrent EquitySecuritiesFvNiCurrentAndNoncurrent	538400000	usd
CY2023Q4	wtm	Other Long Term Investments Cost OtherLongTermInvestmentsCost	1655700000	usd
CY2023	wtm	Other Long Term Investments Unrealized Gain OtherLongTermInvestmentsUnrealizedGain	446300000	usd
CY2023	wtm	Other Long Term Investments Unrealized Loss OtherLongTermInvestmentsUnrealizedLoss	94500000	usd
CY2023	wtm	Other Long Term Investments Net Foreign Currency Gain Loss OtherLongTermInvestmentsNetForeignCurrencyGainLoss	-9300000	usd
CY2023Q4	us-gaap	Other Long Term Investments OtherLongTermInvestments	1998200000	usd
CY2024Q1	wtm	Funds Held Under Reinsurance Agreements Assets Investments FundsHeldUnderReinsuranceAgreementsAssetsInvestments	589600000	usd
CY2023Q4	wtm	Funds Held Under Reinsurance Agreements Assets Investments FundsHeldUnderReinsuranceAgreementsAssetsInvestments	585600000	usd
CY2024Q1	us-gaap	Assets Held By Insurance Regulators AssetsHeldByInsuranceRegulators	4700000	usd
CY2023Q4	us-gaap	Assets Held By Insurance Regulators AssetsHeldByInsuranceRegulators	4600000	usd
CY2024Q1	us-gaap	Other Long Term Investments OtherLongTermInvestments	1991900000	usd
CY2023Q4	us-gaap	Other Long Term Investments OtherLongTermInvestments	1998200000	usd
CY2024Q1	wtm	Other Long Term Investments Remaining Period One To Three Years OtherLongTermInvestmentsRemainingPeriodOneToThreeYears	14400000	usd
CY2024Q1	wtm	Other Long Term Investments Remaining Period Three To Five Years OtherLongTermInvestmentsRemainingPeriodThreeToFiveYears	63500000	usd
CY2024Q1	wtm	Other Long Term Investments Remaining Period Five To Ten Years OtherLongTermInvestmentsRemainingPeriodFiveToTenYears	161000000.0	usd
CY2024Q1	wtm	Other Long Term Investments Remaining Period Greater Than10 Years OtherLongTermInvestmentsRemainingPeriodGreaterThan10Years	16300000	usd
CY2024Q1	us-gaap	Intangible Assets Net Including Goodwill IntangibleAssetsNetIncludingGoodwill	736600000	usd
CY2023Q1	us-gaap	Goodwill Goodwill	168800000	usd
CY2023Q1	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	207400000	usd
CY2024Q1	us-gaap	Goodwill Goodwill	439200000	usd
CY2024Q1	us-gaap	Goodwill Goodwill	439200000	usd
CY2023Q4	us-gaap	Goodwill Goodwill	168800000	usd
CY2023Q4	us-gaap	Goodwill Goodwill	168800000	usd
CY2024Q1	us-gaap	Intangible Assets Gross Excluding Goodwill IntangibleAssetsGrossExcludingGoodwill	320100000	usd
CY2023Q4	us-gaap	Intangible Assets Gross Excluding Goodwill IntangibleAssetsGrossExcludingGoodwill	218800000	usd
CY2024Q1	wtm	Intangible Assets Gross Including Goodwill IntangibleAssetsGrossIncludingGoodwill	759300000	usd
CY2024Q1	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	22700000	usd
CY2024Q1	us-gaap	Intangible Assets Net Including Goodwill IntangibleAssetsNetIncludingGoodwill	736600000	usd
CY2023Q4	wtm	Intangible Assets Gross Including Goodwill IntangibleAssetsGrossIncludingGoodwill	387600000	usd
CY2023Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	17000000.0	usd
CY2023Q4	us-gaap	Intangible Assets Net Including Goodwill IntangibleAssetsNetIncludingGoodwill	370600000	usd
CY2023Q1	us-gaap	Goodwill And Intangible Asset Impairment GoodwillAndIntangibleAssetImpairment	0	usd
CY2024Q1	us-gaap	Goodwill And Intangible Asset Impairment GoodwillAndIntangibleAssetImpairment	0	usd
CY2023Q4	us-gaap	Goodwill Goodwill	168800000	usd
CY2023Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	201800000	usd
CY2023Q4	us-gaap	Intangible Assets Net Including Goodwill IntangibleAssetsNetIncludingGoodwill	370600000	usd
CY2022Q4	us-gaap	Goodwill Goodwill	176500000	usd
CY2022Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	215900000	usd
CY2022Q4	us-gaap	Intangible Assets Net Including Goodwill IntangibleAssetsNetIncludingGoodwill	392400000	usd
CY2024Q1	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	270400000	usd
CY2024Q1	us-gaap	Indefinitelived Intangible Assets Acquired IndefinitelivedIntangibleAssetsAcquired	101000000.0	usd
CY2024Q1	wtm	Goodwill And Indefinite Lived Intangible Assets Acquired During Period GoodwillAndIndefiniteLivedIntangibleAssetsAcquiredDuringPeriod	371400000	usd
CY2023Q1	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	0	usd
CY2023Q1	us-gaap	Indefinitelived Intangible Assets Acquired IndefinitelivedIntangibleAssetsAcquired	0	usd
CY2023Q1	wtm	Goodwill And Indefinite Lived Intangible Assets Acquired During Period GoodwillAndIndefiniteLivedIntangibleAssetsAcquiredDuringPeriod	0	usd
CY2024Q1	us-gaap	Finitelived Intangible Assets Acquired1 FinitelivedIntangibleAssetsAcquired1	300000	usd
CY2024Q1	wtm	Goodwill And Finite Lived Intangible Assets Acquired During Period GoodwillAndFiniteLivedIntangibleAssetsAcquiredDuringPeriod	300000	usd
CY2023Q1	us-gaap	Finitelived Intangible Assets Acquired1 FinitelivedIntangibleAssetsAcquired1	0	usd
CY2023Q1	wtm	Goodwill And Finite Lived Intangible Assets Acquired During Period GoodwillAndFiniteLivedIntangibleAssetsAcquiredDuringPeriod	0	usd
CY2024Q1	us-gaap	Goodwill Written Off Related To Sale Of Business Unit GoodwillWrittenOffRelatedToSaleOfBusinessUnit	0	usd
CY2024Q1	us-gaap	Indefinite Lived Intangible Assets Written Off Related To Sale Of Business Unit IndefiniteLivedIntangibleAssetsWrittenOffRelatedToSaleOfBusinessUnit	0	usd
CY2024Q1	wtm	Goodwill And Indefinite Lived Intangible Assets Written Off Related To Sale Of Business Unit GoodwillAndIndefiniteLivedIntangibleAssetsWrittenOffRelatedToSaleOfBusinessUnit	0	usd
CY2023Q1	us-gaap	Goodwill Written Off Related To Sale Of Business Unit GoodwillWrittenOffRelatedToSaleOfBusinessUnit	6700000	usd
CY2023Q1	us-gaap	Indefinite Lived Intangible Assets Written Off Related To Sale Of Business Unit IndefiniteLivedIntangibleAssetsWrittenOffRelatedToSaleOfBusinessUnit	6900000	usd
CY2023Q1	wtm	Goodwill And Indefinite Lived Intangible Assets Written Off Related To Sale Of Business Unit GoodwillAndIndefiniteLivedIntangibleAssetsWrittenOffRelatedToSaleOfBusinessUnit	13600000	usd
CY2024Q1	us-gaap	Goodwill Purchase Accounting Adjustments GoodwillPurchaseAccountingAdjustments	0	usd
CY2024Q1	us-gaap	Goodwill Purchase Accounting Adjustments GoodwillPurchaseAccountingAdjustments	0	usd
CY2023Q1	us-gaap	Goodwill Purchase Accounting Adjustments GoodwillPurchaseAccountingAdjustments	-1000000.0	usd
CY2023Q1	us-gaap	Goodwill Purchase Accounting Adjustments GoodwillPurchaseAccountingAdjustments	-1000000.0	usd
CY2023Q1	us-gaap	Intangible Assets Net Including Goodwill IntangibleAssetsNetIncludingGoodwill	376200000	usd
CY2024Q1	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 loss adjustment expense (“LAE”) reserve activity of the Ark/WM Outrigger segment</span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:120%"> </span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">for the three months ended March 31, 2024 and 2023: </span></div><div style="text-indent:36pt"><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:99.853%"><tr><td style="width:1.0%"></td><td style="width:68.446%"></td><td style="width:0.1%"></td><td colspan="3" style="display:none"></td><td colspan="3" style="display:none"></td><td colspan="3" style="display:none"></td><td colspan="3" style="display:none"></td><td style="width:0.1%"></td><td style="width:0.532%"></td><td style="width:0.1%"></td><td style="width:1.0%"></td><td style="width:13.394%"></td><td style="width:0.1%"></td><td style="width:0.1%"></td><td style="width:0.532%"></td><td style="width:0.1%"></td><td style="width:1.0%"></td><td style="width:13.396%"></td><td style="width:0.1%"></td></tr><tr><td colspan="3" style="border-top:1pt solid #000;padding:0 1pt"></td><td colspan="3" style="display:none"></td><td colspan="3" style="display:none"></td><td colspan="3" style="border-top:1pt solid #000;padding:0 1pt"></td><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="display:none"></td><td colspan="3" style="display:none"></td><td colspan="3" style="display:none"></td><td colspan="3" style="display:none"></td><td colspan="3" style="padding:0 1pt"></td><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:8pt;font-weight:700;line-height:100%">2024</span></td><td colspan="3" style="border-top:1pt solid #000;padding:0 1pt"></td><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:8pt;font-weight:700;line-height:100%">2023</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="display:none"></td><td colspan="3" style="display:none"></td><td colspan="3" style="display:none"></td><td colspan="3" style="display:none"></td><td colspan="3" style="padding:0 1pt"></td><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%">$</span></td><td style="border-top:1pt solid #000;padding:2px 0;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:100%">1,605.1</span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%"> </span></td><td style="border-top:1pt solid #000;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"></td><td colspan="3" style="padding:0 1pt"></td><td style="border-top:1pt solid #000;padding:2px 0 2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%">$</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%">1,296.5 </span></td><td style="border-top:1pt solid #000;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"></td></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:5.2pt;font-weight:400;line-height:100%;position:relative;top:-2.8pt;vertical-align:baseline">(1)</span></div></td><td colspan="3" style="display:none"></td><td colspan="3" style="display:none"></td><td colspan="3" style="display:none"></td><td colspan="3" style="display:none"></td><td colspan="3" style="padding:0 1pt"></td><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%">(340.8)</span></td><td style="padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"></td><td colspan="3" style="padding:0 1pt"></td><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%">(505.0)</span></td><td style="padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"></td></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="display:none"></td><td colspan="3" style="display:none"></td><td colspan="3" style="display:none"></td><td colspan="3" style="display:none"></td><td colspan="3" style="padding:0 1pt"></td><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%">1,264.3</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><td colspan="3" style="padding:0 1pt"></td><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%">791.5 </span></td><td style="border-top:1pt solid #000;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"></td></tr><tr style="height:3pt"><td colspan="3" style="padding:0 1pt"></td><td colspan="3" style="display:none"></td><td colspan="3" style="display:none"></td><td colspan="3" style="display:none"></td><td colspan="3" style="display:none"></td><td colspan="3" style="padding:0 1pt"></td><td colspan="3" style="padding:0 1pt"></td><td colspan="3" style="padding:0 1pt"></td><td colspan="3" style="padding:0 1pt"></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:10pt;font-weight:400;line-height:100%">Loss and loss adjustment expenses incurred relating to:</span></td><td colspan="3" style="display:none"></td><td colspan="3" style="display:none"></td><td colspan="3" style="display:none"></td><td colspan="3" style="display:none"></td><td colspan="3" style="padding:0 1pt"></td><td colspan="3" style="padding:0 1pt"></td><td colspan="3" style="padding:0 1pt"></td><td colspan="3" style="padding:0 1pt"></td></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="display:none"></td><td colspan="3" style="display:none"></td><td colspan="3" style="display:none"></td><td colspan="3" style="display:none"></td><td colspan="3" style="padding:0 1pt"></td><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%">180.3</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><td colspan="3" style="padding:0 1pt"></td><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%">139.2 </span></td><td style="padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"></td></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="display:none"></td><td colspan="3" style="display:none"></td><td colspan="3" style="display:none"></td><td colspan="3" style="display:none"></td><td colspan="3" style="padding:0 1pt"></td><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)</span></td><td style="padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"></td><td colspan="3" style="padding:0 1pt"></td><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%">8.6 </span></td><td style="padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"></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:10pt;font-weight:400;line-height:100%">Net incurred loss and loss adjustment expenses</span></td><td colspan="3" style="display:none"></td><td colspan="3" style="display:none"></td><td colspan="3" style="display:none"></td><td colspan="3" style="display:none"></td><td colspan="3" style="padding:0 1pt"></td><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%">180.0</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><td colspan="3" style="padding:0 1pt"></td><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%">147.8 </span></td><td style="border-top:1pt solid #000;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"></td></tr><tr><td colspan="3" style="display:none"></td><td colspan="3" style="display:none"></td><td colspan="3" style="display:none"></td><td colspan="3" style="display:none"></td><td colspan="3" style="display:none"></td><td colspan="3" style="display:none"></td><td colspan="3" style="display:none"></td><td colspan="3" style="display:none"></td><td colspan="3" style="display:none"></td></tr><tr><td colspan="3" style="display:none"></td><td colspan="3" style="display:none"></td><td colspan="3" style="display:none"></td><td colspan="3" style="display:none"></td><td colspan="3" style="display:none"></td><td colspan="3" style="display:none"></td><td colspan="3" style="display:none"></td><td colspan="3" style="display:none"></td><td colspan="3" style="display:none"></td></tr><tr style="height:3pt"><td colspan="3" style="padding:0 1pt"></td><td colspan="3" style="display:none"></td><td colspan="3" style="display:none"></td><td colspan="3" style="display:none"></td><td colspan="3" style="display:none"></td><td colspan="3" style="padding:0 1pt"></td><td colspan="3" style="padding:0 1pt"></td><td colspan="3" style="padding:0 1pt"></td><td colspan="3" style="padding:0 1pt"></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:10pt;font-weight:400;line-height:100%">Loss and loss adjustment expenses paid relating to:</span></td><td colspan="3" style="display:none"></td><td colspan="3" style="display:none"></td><td colspan="3" style="display:none"></td><td colspan="3" style="display:none"></td><td colspan="3" style="padding:0 1pt"></td><td colspan="3" style="padding:0 1pt"></td><td colspan="3" style="padding:0 1pt"></td><td colspan="3" style="padding:0 1pt"></td></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="display:none"></td><td colspan="3" style="display:none"></td><td colspan="3" style="display:none"></td><td colspan="3" style="display:none"></td><td colspan="3" style="padding:0 1pt"></td><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%">(4.0)</span></td><td style="padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"></td><td colspan="3" style="padding:0 1pt"></td><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%">(4.0)</span></td><td style="padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"></td></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="display:none"></td><td colspan="3" style="display:none"></td><td colspan="3" style="display:none"></td><td colspan="3" style="display:none"></td><td colspan="3" style="padding:0 1pt"></td><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%">(96.7)</span></td><td style="padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"></td><td colspan="3" style="padding:0 1pt"></td><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%">(87.7)</span></td><td style="padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"></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:10pt;font-weight:400;line-height:100%">Net paid loss and loss adjustment expenses</span></td><td colspan="3" style="display:none"></td><td colspan="3" style="display:none"></td><td colspan="3" style="display:none"></td><td colspan="3" style="display:none"></td><td colspan="3" style="padding:0 1pt"></td><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%">(100.7)</span></td><td style="border-top:1pt solid #000;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"></td><td colspan="3" style="padding:0 1pt"></td><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%">(91.7)</span></td><td style="border-top:1pt solid #000;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"></td></tr><tr style="height:3pt"><td colspan="3" style="padding:0 1pt"></td><td colspan="3" style="display:none"></td><td colspan="3" style="display:none"></td><td colspan="3" style="display:none"></td><td colspan="3" style="display:none"></td><td colspan="3" style="padding:0 1pt"></td><td colspan="3" style="padding:0 1pt"></td><td colspan="3" style="padding:0 1pt"></td><td colspan="3" style="padding:0 1pt"></td></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%">Change in TPC Providers’ participation </span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:5.2pt;font-weight:400;line-height:100%;position:relative;top:-2.8pt;vertical-align:baseline">(2)</span></div></td><td colspan="3" style="display:none"></td><td colspan="3" style="display:none"></td><td colspan="3" style="display:none"></td><td colspan="3" style="display:none"></td><td colspan="3" style="padding:0 1pt"></td><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%">—</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><td colspan="3" style="padding:0 1pt"></td><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%">145.4 </span></td><td style="padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"></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:10pt;font-weight:400;line-height:100%">Foreign currency translation and other adjustments to loss and loss adjustment <br/> expense reserves</span></td><td colspan="3" style="display:none"></td><td colspan="3" style="display:none"></td><td colspan="3" style="display:none"></td><td colspan="3" style="display:none"></td><td colspan="3" style="padding:0 1pt"></td><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%">(3.6)</span></td><td style="padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"></td><td colspan="3" style="padding:0 1pt"></td><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%">3.7 </span></td><td style="padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"></td></tr><tr style="height:3pt"><td colspan="3" style="padding:0 1pt"></td><td colspan="3" style="display:none"></td><td colspan="3" style="display:none"></td><td colspan="3" style="display:none"></td><td colspan="3" style="display:none"></td><td colspan="3" style="padding:0 1pt"></td><td colspan="3" style="padding:0 1pt"></td><td colspan="3" style="padding:0 1pt"></td><td colspan="3" style="padding:0 1pt"></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:10pt;font-weight:400;line-height:100%">Net ending balance</span></td><td colspan="3" style="display:none"></td><td colspan="3" style="display:none"></td><td colspan="3" style="display:none"></td><td colspan="3" style="display:none"></td><td colspan="3" style="padding:0 1pt"></td><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%">1,340.0</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><td colspan="3" style="padding:0 1pt"></td><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%">996.7 </span></td><td style="border-top:1pt solid #000;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"></td></tr><tr><td colspan="3" style="padding:2px 1pt 2px 7pt;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%">Plus: ending reinsurance recoverable on unpaid losses</span></td><td colspan="3" style="display:none"></td><td colspan="3" style="display:none"></td><td colspan="3" style="display:none"></td><td colspan="3" style="display:none"></td><td colspan="3" style="padding:0 1pt"></td><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%">404.5</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><td colspan="3" style="padding:0 1pt"></td><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%">348.9 </span></td><td style="padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"></td></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="display:none"></td><td colspan="3" style="display:none"></td><td colspan="3" style="display:none"></td><td colspan="3" style="display:none"></td><td colspan="3" style="border-bottom:3pt double #000;padding:0 1pt"></td><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%">$</span></td><td style="border-bottom:3pt double #000;border-top:1pt solid #000;padding:2px 0;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:100%">1,744.5</span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%"> </span></td><td style="border-bottom:3pt double #000;border-top:1pt solid #000;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"></td><td colspan="3" style="border-bottom:3pt double #000;padding:0 1pt"></td><td style="border-bottom:3pt double #000;border-top:1pt solid #000;padding:2px 0 2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%">$</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%">1,345.6 </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></tr></table></div><div style="margin-top:3pt;padding-left:9pt;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 $145.4 as of December 31, 2022.</span></div><div style="padding-left:9pt;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%"> Amount represents the impact to net loss and loss adjustment expense reserves due to a change in the TPC Providers’ participation related to the annual RITC process.</span></div>
CY2024Q1	us-gaap	Long Term Debt LongTermDebt	532100000	usd
CY2023Q4	us-gaap	Long Term Debt LongTermDebt	534600000	usd
CY2024Q1	us-gaap	Deferred Other Tax Expense Benefit DeferredOtherTaxExpenseBenefit	-68000000	usd
CY2024Q1	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.046
CY2023Q1	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.060
CY2024Q1	us-gaap	Funds Held Under Reinsurance Agreements Asset FundsHeldUnderReinsuranceAgreementsAsset	933100000	usd
CY2023Q4	us-gaap	Funds Held Under Reinsurance Agreements Asset FundsHeldUnderReinsuranceAgreementsAsset	948500000	usd
CY2024Q1	wtm	Funds Held Under Reinsurance Agreements Assets Cash And Investments FundsHeldUnderReinsuranceAgreementsAssetsCashAndInvestments	592800000	usd
CY2023Q4	wtm	Funds Held Under Reinsurance Agreements Assets Cash And Investments FundsHeldUnderReinsuranceAgreementsAssetsCashAndInvestments	588600000	usd
CY2024Q1	wtm	Funds Held Under Reinsurance Agreements Assets Surplus Notes FundsHeldUnderReinsuranceAgreementsAssetsSurplusNotes	322200000	usd
CY2023Q4	wtm	Funds Held Under Reinsurance Agreements Assets Surplus Notes FundsHeldUnderReinsuranceAgreementsAssetsSurplusNotes	322200000	usd
CY2024Q1	wtm	Funds Held Under Reinsurance Agreements Assets Interest Receivable FundsHeldUnderReinsuranceAgreementsAssetsInterestReceivable	18100000	usd
CY2023Q4	wtm	Funds Held Under Reinsurance Agreements Assets Interest Receivable FundsHeldUnderReinsuranceAgreementsAssetsInterestReceivable	37700000	usd
CY2024Q1	us-gaap	Net Income Loss NetIncomeLoss	236400000	usd
CY2023Q1	us-gaap	Net Income Loss NetIncomeLoss	179500000	usd
CY2024Q1	us-gaap	Undistributed Continuing Operation Earnings Loss Allocation To Participating Securities Basic UndistributedContinuingOperationEarningsLossAllocationToParticipatingSecuritiesBasic	2700000	usd
CY2023Q1	us-gaap	Undistributed Continuing Operation Earnings Loss Allocation To Participating Securities Basic UndistributedContinuingOperationEarningsLossAllocationToParticipatingSecuritiesBasic	2200000	usd
CY2024Q1	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	233700000	usd
CY2024Q1	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	233700000	usd
CY2023Q1	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	177300000	usd
CY2023Q1	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	177300000	usd
CY2024Q1	us-gaap	Weighted Average Number Of Shares Issued Basic WeightedAverageNumberOfSharesIssuedBasic	2559700	shares
CY2023Q1	us-gaap	Weighted Average Number Of Shares Issued Basic WeightedAverageNumberOfSharesIssuedBasic	2569900	shares
CY2024Q1	us-gaap	Weighted Average Number Of Shares Restricted Stock WeightedAverageNumberOfSharesRestrictedStock	28600	shares
CY2023Q1	us-gaap	Weighted Average Number Of Shares Restricted Stock WeightedAverageNumberOfSharesRestrictedStock	31100	shares
CY2024Q1	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	2531100	shares
CY2023Q1	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	2538800	shares
CY2024Q1	us-gaap	Weighted Average Number Of Shares Issued Basic WeightedAverageNumberOfSharesIssuedBasic	2559700	shares
CY2023Q1	us-gaap	Weighted Average Number Of Shares Issued Basic WeightedAverageNumberOfSharesIssuedBasic	2569900	shares
CY2024Q1	us-gaap	Weighted Average Number Of Shares Restricted Stock WeightedAverageNumberOfSharesRestrictedStock	28600	shares
CY2023Q1	us-gaap	Weighted Average Number Of Shares Restricted Stock WeightedAverageNumberOfSharesRestrictedStock	31100	shares
CY2024Q1	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	2531100	shares
CY2023Q1	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	2538800	shares
CY2024Q1	us-gaap	Earnings Per Share Diluted Distributed EarningsPerShareDilutedDistributed	1.00
CY2024Q1	us-gaap	Earnings Per Share Basic Distributed EarningsPerShareBasicDistributed	1.00
CY2023Q1	us-gaap	Earnings Per Share Basic Distributed EarningsPerShareBasicDistributed	1.00
CY2023Q1	us-gaap	Earnings Per Share Diluted Distributed EarningsPerShareDilutedDistributed	1.00
CY2024Q1	us-gaap	Earnings Per Share Diluted Undistributed EarningsPerShareDilutedUndistributed	91.33
CY2024Q1	us-gaap	Earnings Per Share Basic Undistributed EarningsPerShareBasicUndistributed	91.33
CY2023Q1	us-gaap	Earnings Per Share Diluted Undistributed EarningsPerShareDilutedUndistributed	68.83
CY2023Q1	us-gaap	Earnings Per Share Basic Undistributed EarningsPerShareBasicUndistributed	68.83
CY2024Q1	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	92.33
CY2024Q1	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	92.33
CY2023Q1	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	69.83
CY2023Q1	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	69.83
CY2024Q1	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	233700000	usd
CY2023Q1	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	177300000	usd
CY2024Q1	wtm	Dividends Common Stock Cash Net Of Restricted Stock DividendsCommonStockCashNetOfRestrictedStock	2500000	usd
CY2023Q1	wtm	Dividends Common Stock Cash Net Of Restricted Stock DividendsCommonStockCashNetOfRestrictedStock	2500000	usd
CY2024Q1	us-gaap	Undistributed Continuing Operation Earnings Loss Basic UndistributedContinuingOperationEarningsLossBasic	231200000	usd
CY2023Q1	us-gaap	Undistributed Continuing Operation Earnings Loss Basic UndistributedContinuingOperationEarningsLossBasic	174800000	usd
CY2023Q4	wtm	Share Based Compensation Arrangement By Share Based Payment Award Performance Shares ShareBasedCompensationArrangementByShareBasedPaymentAwardPerformanceShares	37031	shares
CY2023Q4	wtm	Share Based Compensation Arrangement By Share Based Payment Award Performance Shares Accrued Liability ShareBasedCompensationArrangementByShareBasedPaymentAwardPerformanceSharesAccruedLiability	69400000	usd
CY2022Q4	wtm	Share Based Compensation Arrangement By Share Based Payment Award Performance Shares ShareBasedCompensationArrangementByShareBasedPaymentAwardPerformanceShares	39449	shares
CY2022Q4	wtm	Share Based Compensation Arrangement By Share Based Payment Award Performance Shares Accrued Liability ShareBasedCompensationArrangementByShareBasedPaymentAwardPerformanceSharesAccruedLiability	67500000	usd
CY2024Q1	wtm	Share Based Compensation Arrangement By Share Based Payment Award Performance Shares Shares Paid In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardPerformanceSharesSharesPaidInPeriod	13475	shares
CY2024Q1	wtm	Share Based Compensation Arrangement By Share Based Payment Award Performance Shares Accrued Liability Shares Paid In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardPerformanceSharesAccruedLiabilitySharesPaidInPeriod	44900000	usd
CY2023Q1	wtm	Share Based Compensation Arrangement By Share Based Payment Award Performance Shares Shares Paid In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardPerformanceSharesSharesPaidInPeriod	13350	shares
CY2023Q1	wtm	Share Based Compensation Arrangement By Share Based Payment Award Performance Shares Accrued Liability Shares Paid In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardPerformanceSharesAccruedLiabilitySharesPaidInPeriod	40800000	usd
CY2024Q1	wtm	Share Based Compensation Arrangement By Share Based Payment Award Performance Shares Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardPerformanceSharesGrantsInPeriod	10405	shares
CY2024Q1	wtm	Share Based Compensation Arrangement By Share Based Payment Award Performance Shares Accrued Liability Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardPerformanceSharesAccruedLiabilityGrantsInPeriod	0	usd
CY2023Q1	wtm	Share Based Compensation Arrangement By Share Based Payment Award Performance Shares Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardPerformanceSharesGrantsInPeriod	10895	shares
CY2023Q1	wtm	Share Based Compensation Arrangement By Share Based Payment Award Performance Shares Accrued Liability Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardPerformanceSharesAccruedLiabilityGrantsInPeriod	0	usd
CY2024Q1	wtm	Share Based Compensation Arrangement By Share Based Payment Award Performance Shares Forfeited And Cancelled In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardPerformanceSharesForfeitedAndCancelledInPeriod	46	shares
CY2024Q1	wtm	Share Based Compensation Arrangement By Share Based Payment Award Performance Shares Accrued Liability Forfeited And Cancelled In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardPerformanceSharesAccruedLiabilityForfeitedAndCancelledInPeriod	300000	usd
CY2023Q1	wtm	Share Based Compensation Arrangement By Share Based Payment Award Performance Shares Forfeited And Cancelled In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardPerformanceSharesForfeitedAndCancelledInPeriod	37	shares
CY2023Q1	wtm	Share Based Compensation Arrangement By Share Based Payment Award Performance Shares Accrued Liability Forfeited And Cancelled In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardPerformanceSharesAccruedLiabilityForfeitedAndCancelledInPeriod	400000	usd
CY2024Q1	wtm	Share Based Compensation Arrangement By Share Based Payment Award Performance Shares Accrued Liability Expense In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardPerformanceSharesAccruedLiabilityExpenseInPeriod	19400000	usd
CY2023Q1	wtm	Share Based Compensation Arrangement By Share Based Payment Award Performance Shares Accrued Liability Expense In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardPerformanceSharesAccruedLiabilityExpenseInPeriod	9300000	usd
CY2024Q1	wtm	Share Based Compensation Arrangement By Share Based Payment Award Performance Shares ShareBasedCompensationArrangementByShareBasedPaymentAwardPerformanceShares	34007	shares
CY2024Q1	wtm	Share Based Compensation Arrangement By Share Based Payment Award Performance Shares Accrued Liability ShareBasedCompensationArrangementByShareBasedPaymentAwardPerformanceSharesAccruedLiability	44200000	usd
CY2023Q1	wtm	Share Based Compensation Arrangement By Share Based Payment Award Performance Shares ShareBasedCompensationArrangementByShareBasedPaymentAwardPerformanceShares	37031	shares
CY2023Q1	wtm	Share Based Compensation Arrangement By Share Based Payment Award Performance Shares Accrued Liability ShareBasedCompensationArrangementByShareBasedPaymentAwardPerformanceSharesAccruedLiability	36400000	usd
CY2024Q1	wtm	Share Based Compensation Arrangement By Share Based Payment Award Performance Shares Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardPerformanceSharesGrantsInPeriod	10405	shares
CY2023Q1	wtm	Share Based Compensation Arrangement By Share Based Payment Award Performance Shares Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardPerformanceSharesGrantsInPeriod	10895	shares
CY2024Q1	wtm	Share Based Compensation Arrangement By Share Based Payment Award Performance Shares Nonvested Number Before Assumed Forfeitures ShareBasedCompensationArrangementByShareBasedPaymentAwardPerformanceSharesNonvestedNumberBeforeAssumedForfeitures	34525	shares
CY2024Q1	wtm	Share Based Compensation Arrangement By Share Based Payment Award Performance Shares Accrued Liability Before Assumed Forfeitures ShareBasedCompensationArrangementByShareBasedPaymentAwardPerformanceSharesAccruedLiabilityBeforeAssumedForfeitures	45000000.0	usd
CY2024Q1	wtm	Share Based Compensation Arrangement By Share Based Payment Award Performance Shares Forfeited In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardPerformanceSharesForfeitedInPeriod	518	shares
CY2024Q1	wtm	Share Based Compensation Arrangement By Share Based Payment Award Performance Shares Accrued Liability Forfeited In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardPerformanceSharesAccruedLiabilityForfeitedInPeriod	800000	usd
CY2024Q1	wtm	Share Based Compensation Arrangement By Share Based Payment Award Performance Shares ShareBasedCompensationArrangementByShareBasedPaymentAwardPerformanceShares	34007	shares
CY2024Q1	wtm	Share Based Compensation Arrangement By Share Based Payment Award Performance Shares Accrued Liability ShareBasedCompensationArrangementByShareBasedPaymentAwardPerformanceSharesAccruedLiability	44200000	usd
CY2024Q1	us-gaap	Minority Interest MinorityInterest	420200000	usd
CY2023Q4	us-gaap	Minority Interest MinorityInterest	321100000	usd
CY2024Q1	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	4	segment
CY2024Q1	us-gaap	Premiums Earned Net PremiumsEarnedNet	319000000.0	usd
CY2024Q1	us-gaap	Net Investment Income NetInvestmentIncome	57000000.0	usd
CY2024Q1	us-gaap	Investment Income Net InvestmentIncomeNet	0	usd
CY2024Q1	us-gaap	Insurance Commissions And Fees InsuranceCommissionsAndFees	25500000	usd
CY2024Q1	us-gaap	Other Income OtherIncome	19000000.0	usd
CY2024Q1	us-gaap	Revenues Revenues	647300000	usd
CY2024Q1	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Incurred Claims1 LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1	185800000	usd
CY2024Q1	us-gaap	Deferred Policy Acquisition Cost Amortization Expense DeferredPolicyAcquisitionCostAmortizationExpense	71600000	usd
CY2024Q1	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	7600000	usd
CY2024Q1	wtm	Broker Commission Expense BrokerCommissionExpense	9300000	usd
CY2024Q1	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	125200000	usd
CY2024Q1	us-gaap	Business Combination Contingent Consideration Arrangements Change In Amount Of Contingent Consideration Liability1 BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1	0	usd
CY2024Q1	us-gaap	Interest Expense InterestExpense	15200000	usd
CY2024Q1	us-gaap	Benefits Losses And Expenses BenefitsLossesAndExpenses	414700000	usd
CY2024Q1	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	232600000	usd
CY2023Q1	us-gaap	Premiums Earned Net PremiumsEarnedNet	262800000	usd
CY2023Q1	us-gaap	Net Investment Income NetInvestmentIncome	39000000.0	usd
CY2023Q1	us-gaap	Investment Income Net InvestmentIncomeNet	0	usd
CY2023Q1	us-gaap	Insurance Commissions And Fees InsuranceCommissionsAndFees	3300000	usd
CY2023Q1	us-gaap	Other Income OtherIncome	28700000	usd
CY2023Q1	us-gaap	Revenues Revenues	531900000	usd
CY2023Q1	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Incurred Claims1 LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1	147800000	usd
CY2023Q1	us-gaap	Deferred Policy Acquisition Cost Amortization Expense DeferredPolicyAcquisitionCostAmortizationExpense	62500000	usd
CY2023Q1	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	13900000	usd
CY2023Q1	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	96000000.0	usd
CY2023Q1	us-gaap	Business Combination Contingent Consideration Arrangements Change In Amount Of Contingent Consideration Liability1 BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1	-2400000	usd
CY2023Q1	us-gaap	Interest Expense InterestExpense	15000000.0	usd
CY2023Q1	us-gaap	Benefits Losses And Expenses BenefitsLossesAndExpenses	332800000	usd
CY2023Q1	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	199100000	usd
CY2024Q1	us-gaap	Equity Method Investment Dividends Or Distributions EquityMethodInvestmentDividendsOrDistributions	15900000	usd
CY2023Q1	us-gaap	Equity Method Investment Dividends Or Distributions EquityMethodInvestmentDividendsOrDistributions	7700000	usd

Files In Submission

Name	View Source	Status
0000776867-24-000010-index-headers.html	Edgar Link	pending
0000776867-24-000010-index.html	Edgar Link	pending
0000776867-24-000010.txt	Edgar Link	pending
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wtm-20240331.htm	Edgar Link	pending
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wtmq12024ex311.htm	Edgar Link	pending
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wtm-20240331_cal.xml	Edgar Link	unprocessable
wtm-20240331_def.xml	Edgar Link	unprocessable
wtm-20240331_lab.xml	Edgar Link	unprocessable
wtm-20240331_pre.xml	Edgar Link	unprocessable
wtm-20240331_htm.xml	Edgar Link	completed
FilingSummary.xml	Edgar Link	unprocessable

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$WTM
WHITE MOUNTAINS INSURANCE GROUP LTD Stock $wtm

2024 Q2 Form 10-Q Financial Statement

#000077686724000010 Filed on May 09, 2024

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$WTM WHITE MOUNTAINS INSURANCE GROUP LTD Stock $wtm

2024 Q2 Form 10-Q Financial Statement

#000077686724000010 Filed on May 09, 2024

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$WTM
WHITE MOUNTAINS INSURANCE GROUP LTD Stock $wtm