$THG
Hanover Insurance Group Inc Stock $thg

$thg Overview Financials Valuation SEC Filings Company Website

2012 Q4 Form 10-Q Financial Statement

#000119312512446614 Filed on November 01, 2012

Income Statement

Concept	2012 Q4	2012 Q3	2011 Q3
Revenue	$1.184B	$1.158B	$1.108B
YoY Change	4.23%	4.49%	37.81%
Cost Of Revenue		$708.4M	$734.9M
YoY Change		-3.61%
Gross Profit		$449.3M	$373.1M
YoY Change		20.42%
Gross Profit Margin		38.81%	33.67%
Selling, General & Admin
YoY Change
% of Gross Profit
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$9.600M	$235.8M	$222.3M
YoY Change	-33.33%	6.07%	5192.86%
% of Gross Profit		52.48%	59.58%
Operating Expenses	$1.270B	$1.090B	$1.110B
YoY Change	20.29%	-1.8%	54.35%
Operating Profit		$62.90M	-$8.200M
YoY Change		-867.07%
Interest Expense	-$15.20M	-$14.60M	-$17.40M
YoY Change	-7.32%	-16.09%	47.46%
% of Operating Profit		-23.21%
Other Income/Expense, Net
YoY Change
Pretax Income	-$106.4M	$48.30M	-$25.60M
YoY Change	-267.3%	-288.67%	-135.02%
Income Tax	-$51.10M	$12.30M	-$9.300M
% Of Pretax Income		25.47%
Net Earnings	-$55.00M	$40.40M	-$10.00M
YoY Change	-210.89%	-504.0%	-119.12%
Net Earnings / Revenue	-4.65%	3.49%	-0.9%
Basic Earnings Per Share	-$1.24	$0.91	-$0.22
Diluted Earnings Per Share	-$1.24	$0.89	-$0.22
COMMON SHARES
Basic Shares Outstanding	44.57M shares	44.60M shares	45.30M shares
Diluted Shares Outstanding		45.20M shares	45.30M shares

Balance Sheet

Concept	2012 Q4	2012 Q3	2011 Q3
SHORT-TERM ASSETS
Cash & Short-Term Investments
YoY Change
Cash & Equivalents	$564.8M	$462.0M	$922.7M
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	$184.9M	$184.8M
YoY Change	-0.32%
Intangibles
YoY Change
Long-Term Investments	$7.478B	$7.445B	$6.668B
YoY Change	11.26%	11.65%	31.47%
Other Assets	$398.0M	$336.0M	$343.0M
YoY Change	0.76%	-2.04%	37.2%
Total Long-Term Assets
YoY Change
TOTAL ASSETS
Total Short-Term Assets
Total Long-Term Assets
Total Assets	$13.48B	$13.33B	$12.69B
YoY Change	7.03%	5.09%	47.55%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable
YoY Change
Accrued Expenses
YoY Change
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	$776.0M	$619.0M	$673.0M
YoY Change	20.68%	-8.02%	28.44%
LONG-TERM LIABILITIES
Long-Term Debt	$849.0M	$918.0M	$902.0M
YoY Change	-6.81%	1.77%	40.94%
Other Long-Term Liabilities	$126.0M	$126.0M	$128.0M
YoY Change	-2.33%	-1.56%	-5.19%
Total Long-Term Liabilities	$975.0M	$1.044B	$1.030B
YoY Change	-6.25%	1.36%	32.9%
TOTAL LIABILITIES
Total Short-Term Liabilities	$776.0M	$619.0M	$673.0M
Total Long-Term Liabilities	$975.0M	$1.044B	$1.030B
Total Liabilities	$10.89B	$10.63B	$10.23B
YoY Change	7.66%	3.92%	67.21%
SHAREHOLDERS EQUITY
Retained Earnings	$1.212B	$1.282B
YoY Change	0.02%
Common Stock	$600.0K	$600.0K
YoY Change	0.0%
Preferred Stock
YoY Change
Treasury Stock (at cost)	$729.7M	$732.3M
YoY Change	0.91%
Treasury Stock Shares	16.20M shares	16.20M shares
Shareholders Equity	$2.595B	$2.699B	$2.429B
YoY Change
Total Liabilities & Shareholders Equity	$13.48B	$13.33B	$12.69B
YoY Change	7.03%	5.09%	47.55%

Cashflow Statement

Concept	2012 Q4	2012 Q3	2011 Q3
OPERATING ACTIVITIES
Net Income	-$55.00M	$40.40M	-$10.00M
YoY Change	-210.89%	-504.0%	-119.12%
Depreciation, Depletion And Amortization	$9.600M	$235.8M	$222.3M
YoY Change	-33.33%	6.07%	5192.86%
Cash From Operating Activities	$203.8M	$145.3M	$183.7M
YoY Change	-414.02%	-20.9%	140.13%
INVESTING ACTIVITIES
Capital Expenditures	-$10.10M	-$4.500M	-$5.300M
YoY Change	50.75%	-15.09%	130.43%
Acquisitions
YoY Change
Other Investing Activities	-$24.20M	-$198.0M	$105.8M
YoY Change	-41.97%	-287.15%	-220.64%
Cash From Investing Activities	-$34.30M	-$202.5M	$100.5M
YoY Change	-29.13%	-301.49%	-211.67%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	-74.80M	-17.60M	-54.70M
YoY Change	454.07%	-67.82%	-326.03%
NET CHANGE
Cash From Operating Activities	203.8M	145.3M	183.7M
Cash From Investing Activities	-34.30M	-202.5M	100.5M
Cash From Financing Activities	-74.80M	-17.60M	-54.70M
Net Change In Cash	94.70M	-74.80M	229.5M
YoY Change	-174.68%	-132.59%	2044.86%
FREE CASH FLOW
Cash From Operating Activities	$203.8M	$145.3M	$183.7M
Capital Expenditures	-$10.10M	-$4.500M	-$5.300M
Free Cash Flow	$213.9M	$149.8M	$189.0M
YoY Change	-467.53%	-20.74%	139.85%

Facts In Submission

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	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	12900000
	us-gaap	Increase Decrease In Reinsurance Recoverable IncreaseDecreaseInReinsuranceRecoverable	53700000
	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	-268400000
	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	86800000
	us-gaap	Payments For Repurchase Of Equity PaymentsForRepurchaseOfEquity	20000000
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	us-gaap	Gain Loss On Investments GainLossOnInvestments	24900000
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	41900000
	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	-40700000
	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-600000
	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Expirations In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExpirationsInPeriodWeightedAverageExercisePrice	57.00
	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	22500000
	us-gaap	Business Acquisition Pro Forma Earnings Per Share Basic BusinessAcquisitionProFormaEarningsPerShareBasic	-1.46
	us-gaap	Share Based Compensation ShareBasedCompensation	9700000
	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Grants In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice	46.47
	us-gaap	Business Acquisitions Pro Forma Revenue BusinessAcquisitionsProFormaRevenue	3224800000
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.28
	us-gaap	Fees And Commissions FeesAndCommissions	30800000
	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Forfeitures In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice	39.92
	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	62700000
	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	118014	shares
	us-gaap	Pro Forma Weighted Average Shares Outstanding Diluted ProFormaWeightedAverageSharesOutstandingDiluted	45400000	shares
	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Expirations In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpirationsInPeriod	256250	shares
	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	1122500000
	us-gaap	Other Than Temporary Impairment Losses Investments Portion In Other Comprehensive Income Loss Before Tax Including Portion Attributable To Noncontrolling Interest Availableforsale Securities OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxIncludingPortionAttributableToNoncontrollingInterestAvailableforsaleSecurities	900000
	us-gaap	Premiums Earned Net Property And Casualty PremiumsEarnedNetPropertyAndCasualty	2774500000
	us-gaap	Depreciation And Amortization DepreciationAndAmortization	12300000
	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	3900000
	us-gaap	Business Combination Acquisition Related Costs BusinessCombinationAcquisitionRelatedCosts	15700000
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	286300000
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	231200000
	us-gaap	Increase Decrease In Premiums Receivable IncreaseDecreaseInPremiumsReceivable	-41100000
	us-gaap	Loss On Derivative Instruments Pretax LossOnDerivativeInstrumentsPretax	11300000
	us-gaap	Other Comprehensive Income Loss Foreign Currency Translation Adjustment Tax OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax	-5100000
	us-gaap	Increase Decrease In Accrued Investment Income Receivable IncreaseDecreaseInAccruedInvestmentIncomeReceivable	30700000
	us-gaap	Deferred Policy Acquisition Cost Amortization Expense DeferredPolicyAcquisitionCostAmortizationExpense	547500000
	us-gaap	Segment Reporting Information Revenue SegmentReportingInformationRevenue	2770800000
	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	-1200000
	us-gaap	Increase Decrease In Securities Lending Payable IncreaseDecreaseInSecuritiesLendingPayable	-32600000
	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice	33.13
	us-gaap	Increase Decrease In Deferred Income Taxes IncreaseDecreaseInDeferredIncomeTaxes	-13800000
	us-gaap	Income Loss From Discontinued Operations Net Of Tax IncomeLossFromDiscontinuedOperationsNetOfTax	2000000
	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	9800000
	us-gaap	Increase Decrease In Deferred Policy Acquisition Costs IncreaseDecreaseInDeferredPolicyAcquisitionCosts	-17600000
	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	629900000
	us-gaap	Weighted Average Basic Shares Outstanding Pro Forma WeightedAverageBasicSharesOutstandingProForma	45400000	shares
	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	314400000
	us-gaap	Benefits Losses And Expenses BenefitsLossesAndExpenses	2837700000
	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-5000000
	us-gaap	Other Comprehensive Income Reclassification Of Defined Benefit Plans Net Gain Loss Recognized In Net Periodic Benefit Cost Before Tax OtherComprehensiveIncomeReclassificationOfDefinedBenefitPlansNetGainLossRecognizedInNetPeriodicBenefitCostBeforeTax	11600000
	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax	-1800000
	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Gain Loss Included In Other Comprehensive Income Loss FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss	900000
	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Reductions Change In Status OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsReductionsChangeInStatus	800000
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	45400000	shares
	us-gaap	Other Than Temporary Impairment Losses Investments Availableforsale Securities OtherThanTemporaryImpairmentLossesInvestmentsAvailableforsaleSecurities	2800000
	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	-9400000
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	-42000000
	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	54800000
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.28
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	140800000
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment For Sale Of Securities Included In Net Income Tax OtherComprehensiveIncomeLossReclassificationAdjustmentForSaleOfSecuritiesIncludedInNetIncomeTax	-2400000
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	74600000
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment For Sale Of Securities Included In Net Income Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentForSaleOfSecuritiesIncludedInNetIncomeNetOfTax	-27100000
	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	-0.33
	us-gaap	Gain Loss On Sale Of Investments GainLossOnSaleOfInvestments	13400000
	us-gaap	Foreign Income Tax Expense Benefit Continuing Operations ForeignIncomeTaxExpenseBenefitContinuingOperations	7300000
	us-gaap	Interest Expense Debt InterestExpenseDebt	38600000
	us-gaap	Payments To Acquire Available For Sale Securities Equity PaymentsToAcquireAvailableForSaleSecuritiesEquity	58600000
	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Before Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax	-14500000
	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod	23665	shares
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment For Sale Of Securities Included In Net Income Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentForSaleOfSecuritiesIncludedInNetIncomeBeforeTax	-24700000
	us-gaap	Policyholder Benefits And Claims Incurred Net PolicyholderBenefitsAndClaimsIncurredNet	1863400000
	us-gaap	Allocated Share Based Compensation Expense Net Of Tax AllocatedShareBasedCompensationExpenseNetOfTax	6200000
	us-gaap	Increase Decrease In Insurance Liabilities IncreaseDecreaseInInsuranceLiabilities	254600000
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	45400000	shares
	us-gaap	Premiums Earned Net PremiumsEarnedNet	2550800000
	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	-2700000
	us-gaap	Other Than Temporary Impairment Losses Investments Portion Recognized In Earnings Net OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet	3700000
	us-gaap	Revenues Revenues	2795700000
	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax	-7700000
	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	1138200000
	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	9500000
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	-44300000
	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax	10500000
	us-gaap	Payments For Proceeds From Derivative Instrument Investing Activities PaymentsForProceedsFromDerivativeInstrumentInvestingActivities	2200000
	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax	600000
	us-gaap	Revenues From Transactions With Other Operating Segments Of Same Entity RevenuesFromTransactionsWithOtherOperatingSegmentsOfSameEntity	-3700000
	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Reductions Securities Sold OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsReductionsSecuritiesSold	1600000
	us-gaap	Business Acquisitions Pro Forma Net Income Loss BusinessAcquisitionsProFormaNetIncomeLoss	-66300000
	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	388200000
	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	13600000
	us-gaap	Proceeds From Sale Of Available For Sale Securities Equity ProceedsFromSaleOfAvailableForSaleSecuritiesEquity	17700000
	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	2100000	shares
	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Before Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax	49900000
	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Transfers Out Of Level3 FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3	15800000
	us-gaap	Net Income Loss NetIncomeLoss	-12900000
	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Transfers Into Level3 FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersIntoLevel3	10600000
	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Sales FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales	15500000
	us-gaap	Foreign Currency Transaction Gain Loss Realized ForeignCurrencyTransactionGainLossRealized	6700000
	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod	297000	shares
	us-gaap	Net Investment Income NetInvestmentIncome	189200000
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-27100000
	us-gaap	Effect Of Exchange Rate On Cash And Cash Equivalents EffectOfExchangeRateOnCashAndCashEquivalents	-28400000
	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	-0.33
	us-gaap	Other Amortization Of Deferred Charges OtherAmortizationOfDeferredCharges	7700000
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	87500000
	us-gaap	Payments Of Dividends PaymentsOfDividends	37500000
	us-gaap	Realized Investment Gains Losses RealizedInvestmentGainsLosses	28600000
	us-gaap	Business Acquisition Pro Forma Earnings Per Share Diluted BusinessAcquisitionProFormaEarningsPerShareDiluted	-1.46
	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Additions Additional Credit Losses OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsAdditionsAdditionalCreditLosses	600000
	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	60400000
	thg	Other Comprehensive Income Net Unrealized Gains And Losses On Securities Before Tax OtherComprehensiveIncomeNetUnrealizedGainsAndLossesOnSecuritiesBeforeTax	48100000
	thg	Other Comprehensive Income Net Unrealized Gains And Losses On Securities Tax OtherComprehensiveIncomeNetUnrealizedGainsAndLossesOnSecuritiesTax	-11100000
	thg	Other Comprehensive Income Net Unrealized Gains And Losses On Securities Net Of Tax OtherComprehensiveIncomeNetUnrealizedGainsAndLossesOnSecuritiesNetOfTax	59200000
	thg	Other Temporary Impairment Losses Investments Portion In Other Comprehensive Income Loss Before Taxes OtherTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxes	6200000
	thg	Other Comprehensive Income Appreciation On Securities During Period Net Of Tax OtherComprehensiveIncomeAppreciationOnSecuritiesDuringPeriodNetOfTax	41900000
	thg	Other Comprehensive Income Loss Net Unrealized Gains And Losses On Securities Tax OtherComprehensiveIncomeLossNetUnrealizedGainsAndLossesOnSecuritiesTax	-11100000
	thg	Other Comprehensive Income Loss Net Unrealized Gains And Losses On Securities Net Of Tax OtherComprehensiveIncomeLossNetUnrealizedGainsAndLossesOnSecuritiesNetOfTax	59200000
	dei	Trading Symbol TradingSymbol	THG
	dei	Entity Registrant Name EntityRegistrantName	HANOVER INSURANCE GROUP, INC.
	dei	Amendment Flag AmendmentFlag	false
	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	Q3
	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2012
	dei	Document Type DocumentType	10-Q
	dei	Document Period End Date DocumentPeriodEndDate	2012-09-30
	dei	Entity Central Index Key EntityCentralIndexKey	0000944695
	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	0.21
	us-gaap	Other Than Temporary Impairment Losses Investments Portion Recognized In Earnings Net Availableforsale Securities OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNetAvailableforsaleSecurities	5700000
	us-gaap	Other Comprehensive Income Loss Amortization Pension And Other Postretirement Benefit Plans Net Prior Service Cost Recognized In Net Periodic Benefit Cost Before Tax OtherComprehensiveIncomeLossAmortizationPensionAndOtherPostretirementBenefitPlansNetPriorServiceCostRecognizedInNetPeriodicBenefitCostBeforeTax	2800000
	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	0.21
	us-gaap	Federal Income Tax Expense Benefit Continuing Operations FederalIncomeTaxExpenseBenefitContinuingOperations	3400000
	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Gain Loss Included In Earnings1 FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1	-200000
	us-gaap	Net Cash Provided By Used In Discontinued Operations NetCashProvidedByUsedInDiscontinuedOperations	100000
	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Purchases FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases	10800000
	us-gaap	Operating Income Loss OperatingIncomeLoss	179600000
	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	3400000
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	-35600000
	us-gaap	Increase Decrease In Reinsurance Recoverable IncreaseDecreaseInReinsuranceRecoverable	181300000
	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	800000
	us-gaap	Payments For Repurchase Of Equity PaymentsForRepurchaseOfEquity	20000000
	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	101400000
	us-gaap	Gain Loss On Investments GainLossOnInvestments	4700000
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	264500000
	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	11200000
	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-200000
	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Expirations In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExpirationsInPeriodWeightedAverageExercisePrice	44.05
	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	60400000
	us-gaap	Share Based Compensation ShareBasedCompensation	9800000
	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Grants In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice	36.81
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.44
	us-gaap	Fees And Commissions FeesAndCommissions	38900000
	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Forfeitures In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice	41.84
	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	-23800000
	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	56874	shares
	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Expirations In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpirationsInPeriod	159850	shares
	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	1601100000
	us-gaap	Other Than Temporary Impairment Losses Investments Portion In Other Comprehensive Income Loss Before Tax Including Portion Attributable To Noncontrolling Interest Availableforsale Securities OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxIncludingPortionAttributableToNoncontrollingInterestAvailableforsaleSecurities	500000
	us-gaap	Premiums Earned Net Property And Casualty PremiumsEarnedNetPropertyAndCasualty	3406700000
	us-gaap	Depreciation And Amortization DepreciationAndAmortization	26000000
	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	1900000
	us-gaap	Business Combination Acquisition Related Costs BusinessCombinationAcquisitionRelatedCosts	2200000
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	204600000
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-528500000
	us-gaap	Increase Decrease In Premiums Receivable IncreaseDecreaseInPremiumsReceivable	87500000
	us-gaap	Other Comprehensive Income Loss Foreign Currency Translation Adjustment Tax OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax	4600000
	us-gaap	Increase Decrease In Accrued Investment Income Receivable IncreaseDecreaseInAccruedInvestmentIncomeReceivable	2900000
	us-gaap	Deferred Policy Acquisition Cost Amortization Expense DeferredPolicyAcquisitionCostAmortizationExpense	697000000
	us-gaap	Segment Reporting Information Revenue SegmentReportingInformationRevenue	3402000000
	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	100000
	us-gaap	Increase Decrease In Securities Lending Payable IncreaseDecreaseInSecuritiesLendingPayable	-6600000
	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice	29.33
	us-gaap	Increase Decrease In Deferred Income Taxes IncreaseDecreaseInDeferredIncomeTaxes	-21900000
	us-gaap	Income Loss From Discontinued Operations Net Of Tax IncomeLossFromDiscontinuedOperationsNetOfTax	9500000
	us-gaap	Discontinued Operation Gain Loss On Disposal Of Discontinued Operation Net Of Tax DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax	10800000
	us-gaap	Number Of Operating Segments NumberOfOperatingSegments	4	Segment
	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	11200000
	us-gaap	Increase Decrease In Deferred Policy Acquisition Costs IncreaseDecreaseInDeferredPolicyAcquisitionCosts	42600000
	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	-358500000
	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	7400000
	us-gaap	Benefits Losses And Expenses BenefitsLossesAndExpenses	3271600000
	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-4600000
	us-gaap	Other Comprehensive Income Reclassification Of Defined Benefit Plans Net Gain Loss Recognized In Net Periodic Benefit Cost Before Tax OtherComprehensiveIncomeReclassificationOfDefinedBenefitPlansNetGainLossRecognizedInNetPeriodicBenefitCostBeforeTax	9800000
	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax	100000
	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Gain Loss Included In Other Comprehensive Income Loss FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss	-2800000
	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Reductions Change In Status OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsReductionsChangeInStatus	200000
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	45400000	shares
	us-gaap	Other Than Temporary Impairment Losses Investments Availableforsale Securities OtherThanTemporaryImpairmentLossesInvestmentsAvailableforsaleSecurities	5200000
	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	8400000
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	135100000
	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	153600000
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.47
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-58600000
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment For Sale Of Securities Included In Net Income Tax OtherComprehensiveIncomeLossReclassificationAdjustmentForSaleOfSecuritiesIncludedInNetIncomeTax	-7900000
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	191300000
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment For Sale Of Securities Included In Net Income Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentForSaleOfSecuritiesIncludedInNetIncomeNetOfTax	-15200000
	us-gaap	Discontinued Operation Tax Effect Of Discontinued Operation DiscontinuedOperationTaxEffectOfDiscontinuedOperation	700000
	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	2.26
	us-gaap	Gain Loss On Sale Of Investments GainLossOnSaleOfInvestments	3800000
	us-gaap	Foreign Income Tax Expense Benefit Continuing Operations ForeignIncomeTaxExpenseBenefitContinuingOperations	30300000
	us-gaap	Interest Expense Debt InterestExpenseDebt	46700000
	us-gaap	Proceeds From Divestiture Of Businesses And Interests In Affiliates ProceedsFromDivestitureOfBusinessesAndInterestsInAffiliates	5200000
	us-gaap	Payments To Acquire Available For Sale Securities Equity PaymentsToAcquireAvailableForSaleSecuritiesEquity	206100000
	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Before Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax	13000000
	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod	90574	shares
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment For Sale Of Securities Included In Net Income Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentForSaleOfSecuritiesIncludedInNetIncomeBeforeTax	-7300000
	us-gaap	Policyholder Benefits And Claims Incurred Net PolicyholderBenefitsAndClaimsIncurredNet	2101900000
	us-gaap	Allocated Share Based Compensation Expense Net Of Tax AllocatedShareBasedCompensationExpenseNetOfTax	6400000
	us-gaap	Increase Decrease In Insurance Liabilities IncreaseDecreaseInInsuranceLiabilities	442100000
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	44800000	shares
	us-gaap	Premiums Earned Net PremiumsEarnedNet	3156600000
	us-gaap	Loss Contingency Number Of Defendants LossContingencyNumberOfDefendants	200	pure
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	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	9800000
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	132900000
	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax	-43500000
	us-gaap	Payments For Proceeds From Derivative Instrument Investing Activities PaymentsForProceedsFromDerivativeInstrumentInvestingActivities	4400000
	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Additions No Previous Impairment OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsAdditionsNoPreviousImpairment	500000
	us-gaap	Revenues From Transactions With Other Operating Segments Of Same Entity RevenuesFromTransactionsWithOtherOperatingSegmentsOfSameEntity	-4700000
	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Reductions Securities Sold OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsReductionsSecuritiesSold	4200000
	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	426000000
	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	22500000
	us-gaap	Proceeds From Sale Of Available For Sale Securities Equity ProceedsFromSaleOfAvailableForSaleSecuritiesEquity	21700000
	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	1800000	shares
	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Before Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax	184000000
	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Transfers Out Of Level3 FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3	10800000
	us-gaap	Net Income Loss NetIncomeLoss	110900000
	us-gaap	Foreign Currency Transaction Gain Loss Before Tax ForeignCurrencyTransactionGainLossBeforeTax	3000000
	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Transfers Into Level3 FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersIntoLevel3	7000000
	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Sales FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales	8800000
	us-gaap	Foreign Currency Transaction Gain Loss Realized ForeignCurrencyTransactionGainLossRealized	-300000
	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod	517500	shares
	us-gaap	Net Investment Income NetInvestmentIncome	206500000
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	33700000
	us-gaap	Effect Of Exchange Rate On Cash And Cash Equivalents EffectOfExchangeRateOnCashAndCashEquivalents	24000000
	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	2.23
	us-gaap	Other Amortization Of Deferred Charges OtherAmortizationOfDeferredCharges	7000000
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	155700000
	us-gaap	Payments Of Dividends PaymentsOfDividends	40300000
	us-gaap	Realized Investment Gains Losses RealizedInvestmentGainsLosses	10400000
	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Additions Additional Credit Losses OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsAdditionsAdditionalCreditLosses	600000
	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	140500000
	thg	Other Comprehensive Income Net Unrealized Gains And Losses On Securities Before Tax OtherComprehensiveIncomeNetUnrealizedGainsAndLossesOnSecuritiesBeforeTax	184100000
	thg	Other Comprehensive Income Net Unrealized Gains And Losses On Securities Tax OtherComprehensiveIncomeNetUnrealizedGainsAndLossesOnSecuritiesTax	43500000
	thg	Other Comprehensive Income Net Unrealized Gains And Losses On Securities Net Of Tax OtherComprehensiveIncomeNetUnrealizedGainsAndLossesOnSecuritiesNetOfTax	140600000
	thg	Treasury Rate TreasuryRate	30	Y
	thg	Share Based Compensation Arrangement By Share Based Payment Award Market Based Restricted Stock Units Average Period ShareBasedCompensationArrangementByShareBasedPaymentAwardMarketBasedRestrictedStockUnitsAveragePeriod	3	Y
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	thg	Performance Based Restricted Stock Units Performance Metric Maximum Potential Range PerformanceBasedRestrictedStockUnitsPerformanceMetricMaximumPotentialRange	1.33	pure
	thg	Performance Based Restricted Stock Units Performance Metric Minimum Potential Range PerformanceBasedRestrictedStockUnitsPerformanceMetricMinimumPotentialRange	0.00	pure
CY2011Q3	us-gaap	Premiums Earned Net Property And Casualty PremiumsEarnedNetPropertyAndCasualty	1101000000
CY2011Q3	us-gaap	Business Combination Acquisition Related Costs BusinessCombinationAcquisitionRelatedCosts	1900000
CY2011Q3	us-gaap	Loss On Derivative Instruments Pretax LossOnDerivativeInstrumentsPretax	6600000
CY2011Q3	us-gaap	Other Comprehensive Income Loss Foreign Currency Translation Adjustment Tax OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax	-5100000
CY2011Q3	us-gaap	Deferred Policy Acquisition Cost Amortization Expense DeferredPolicyAcquisitionCostAmortizationExpense	222300000
	thg	Other Temporary Impairment Losses Investments Portion In Other Comprehensive Income Loss Before Taxes OtherTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxes	11000000
	thg	Other Comprehensive Income Appreciation On Securities During Period Net Of Tax OtherComprehensiveIncomeAppreciationOnSecuritiesDuringPeriodNetOfTax	173100000
	thg	Net Unrealized Gains Impaired Securities NetUnrealizedGainsImpairedSecurities	22600000
	thg	Minimum Required Participant Age MinimumRequiredParticipantAge	65	Y
	thg	Per Share Effect Of Dilutive Securities On Income From Continuing Operations And Net Income PerShareEffectOfDilutiveSecuritiesOnIncomeFromContinuingOperationsAndNetIncome	30000
	thg	Other Comprehensive Income Loss Net Unrealized Gains And Losses On Securities Tax OtherComprehensiveIncomeLossNetUnrealizedGainsAndLossesOnSecuritiesTax	43500000
	thg	Other Comprehensive Income Loss Net Unrealized Gains And Losses On Securities Net Of Tax OtherComprehensiveIncomeLossNetUnrealizedGainsAndLossesOnSecuritiesNetOfTax	140600000
CY2011	thg	Net Unrealized Gains Impaired Securities NetUnrealizedGainsImpairedSecurities	25100000
CY2011	thg	Percentage Of Reduction In Stockholders Equity Due To New Accounting Pronouncement PercentageOfReductionInStockholdersEquityDueToNewAccountingPronouncement	0.01	pure
CY2011Q3	us-gaap	Other Than Temporary Impairment Losses Investments Portion Recognized In Earnings Net Availableforsale Securities OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNetAvailableforsaleSecurities	1500000
CY2011Q3	us-gaap	Other Comprehensive Income Loss Amortization Pension And Other Postretirement Benefit Plans Net Prior Service Cost Recognized In Net Periodic Benefit Cost Before Tax OtherComprehensiveIncomeLossAmortizationPensionAndOtherPostretirementBenefitPlansNetPriorServiceCostRecognizedInNetPeriodicBenefitCostBeforeTax	1300000
CY2011Q3	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-100000
CY2011Q3	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Gain Loss Included In Earnings1 FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1	-100000
CY2011Q3	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Purchases FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases	7300000
CY2011Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	-8200000
CY2011Q3	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	1200000
CY2011Q3	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	7800000
CY2011Q3	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	-10000000
CY2011Q3	us-gaap	Gain Loss On Investments GainLossOnInvestments	8200000
CY2011Q3	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	-1000000
CY2011Q3	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	-18400000
CY2011Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.22
CY2011Q3	us-gaap	Fees And Commissions FeesAndCommissions	13400000
CY2011Q3	us-gaap	Other Than Temporary Impairment Losses Investments Portion In Other Comprehensive Income Loss Before Tax Including Portion Attributable To Noncontrolling Interest Availableforsale Securities OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxIncludingPortionAttributableToNoncontrollingInterestAvailableforsaleSecurities	400000
CY2011Q3	us-gaap	Segment Reporting Information Revenue SegmentReportingInformationRevenue	1099800000
CY2011Q3	us-gaap	Benefits Losses And Expenses BenefitsLossesAndExpenses	1127300000
CY2011Q3	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-1700000
CY2011Q3	us-gaap	Other Comprehensive Income Reclassification Of Defined Benefit Plans Net Gain Loss Recognized In Net Periodic Benefit Cost Before Tax OtherComprehensiveIncomeReclassificationOfDefinedBenefitPlansNetGainLossRecognizedInNetPeriodicBenefitCostBeforeTax	3900000
CY2011Q3	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax	100000
CY2011Q3	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Gain Loss Included In Other Comprehensive Income Loss FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss	2100000
CY2011Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	45300000	shares
CY2011Q3	us-gaap	Other Than Temporary Impairment Losses Investments Availableforsale Securities OtherThanTemporaryImpairmentLossesInvestmentsAvailableforsaleSecurities	1100000
CY2011Q3	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	-9400000
CY2011Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	-19300000
CY2011Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	9000000
CY2011Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.22
CY2011Q3	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment For Sale Of Securities Included In Net Income Tax OtherComprehensiveIncomeLossReclassificationAdjustmentForSaleOfSecuritiesIncludedInNetIncomeTax	1900000
CY2011Q3	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	15400000
CY2011Q3	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment For Sale Of Securities Included In Net Income Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentForSaleOfSecuritiesIncludedInNetIncomeNetOfTax	-6500000
CY2011Q3	us-gaap	Discontinued Operation Tax Effect Of Discontinued Operation DiscontinuedOperationTaxEffectOfDiscontinuedOperation	100000
CY2011Q3	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	-0.22
CY2011Q3	us-gaap	Interest Expense Debt InterestExpenseDebt	17400000
CY2011Q3	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Before Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax	-14500000
CY2011Q3	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment For Sale Of Securities Included In Net Income Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentForSaleOfSecuritiesIncludedInNetIncomeBeforeTax	-8400000
CY2011Q3	us-gaap	Policyholder Benefits And Claims Incurred Net PolicyholderBenefitsAndClaimsIncurredNet	734900000
CY2011Q3	us-gaap	Allocated Share Based Compensation Expense Net Of Tax AllocatedShareBasedCompensationExpenseNetOfTax	2300000
CY2011Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	45300000	shares
CY2011Q3	us-gaap	Premiums Earned Net PremiumsEarnedNet	1018600000
CY2011Q3	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	-900000
CY2011Q3	us-gaap	Other Than Temporary Impairment Losses Investments Portion Recognized In Earnings Net OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet	1500000
CY2011Q3	us-gaap	Revenues Revenues	1108000000
CY2011Q3	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax	-2600000
CY2011Q3	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	3500000
CY2011Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	-25600000
CY2011Q3	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax	9700000
CY2011Q3	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax	-100000
CY2011Q3	us-gaap	Revenues From Transactions With Other Operating Segments Of Same Entity RevenuesFromTransactionsWithOtherOperatingSegmentsOfSameEntity	-1200000
CY2011Q3	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Reductions Securities Sold OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsReductionsSecuritiesSold	300000
CY2011Q3	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	152700000
CY2011Q3	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	9100000
CY2011Q3	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	2500000	shares
CY2011Q3	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Before Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax	7000000
CY2011Q3	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Transfers Out Of Level3 FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3	9300000
CY2011Q3	us-gaap	Net Income Loss NetIncomeLoss	-10000000
CY2011Q3	us-gaap	Foreign Currency Transaction Gain Loss Before Tax ForeignCurrencyTransactionGainLossBeforeTax	-1900000
CY2011Q3	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Transfers Into Level3 FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersIntoLevel3	6900000
CY2011Q3	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Sales FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales	13200000
CY2011Q3	us-gaap	Foreign Currency Transaction Gain Loss Realized ForeignCurrencyTransactionGainLossRealized	6700000
CY2011Q3	us-gaap	Net Investment Income NetInvestmentIncome	67800000
CY2011Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-9300000
CY2011Q3	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	-0.22
CY2011Q3	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	23200000
CY2011Q3	us-gaap	Realized Investment Gains Losses RealizedInvestmentGainsLosses	9700000
CY2011Q3	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Additions Additional Credit Losses OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsAdditionsAdditionalCreditLosses	400000
CY2011Q3	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	16700000
CY2011Q3	thg	Other Comprehensive Income Net Unrealized Gains And Losses On Securities Before Tax OtherComprehensiveIncomeNetUnrealizedGainsAndLossesOnSecuritiesBeforeTax	7100000
CY2011Q3	thg	Other Comprehensive Income Net Unrealized Gains And Losses On Securities Tax OtherComprehensiveIncomeNetUnrealizedGainsAndLossesOnSecuritiesTax	-9600000
CY2011Q3	thg	Other Comprehensive Income Net Unrealized Gains And Losses On Securities Net Of Tax OtherComprehensiveIncomeNetUnrealizedGainsAndLossesOnSecuritiesNetOfTax	16700000
CY2011Q3	thg	Other Temporary Impairment Losses Investments Portion In Other Comprehensive Income Loss Before Taxes OtherTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxes	800000
CY2011Q3	thg	Other Comprehensive Income Appreciation On Securities During Period Net Of Tax OtherComprehensiveIncomeAppreciationOnSecuritiesDuringPeriodNetOfTax	6300000
CY2011Q3	thg	Other Comprehensive Income Loss Net Unrealized Gains And Losses On Securities Tax OtherComprehensiveIncomeLossNetUnrealizedGainsAndLossesOnSecuritiesTax	-9600000
CY2011Q3	thg	Other Comprehensive Income Loss Net Unrealized Gains And Losses On Securities Net Of Tax OtherComprehensiveIncomeLossNetUnrealizedGainsAndLossesOnSecuritiesNetOfTax	16700000
CY2012Q3	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	-0.01
CY2012Q3	us-gaap	Other Than Temporary Impairment Losses Investments Portion Recognized In Earnings Net Availableforsale Securities OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNetAvailableforsaleSecurities	2200000
CY2012Q3	us-gaap	Other Comprehensive Income Loss Amortization Pension And Other Postretirement Benefit Plans Net Prior Service Cost Recognized In Net Periodic Benefit Cost Before Tax OtherComprehensiveIncomeLossAmortizationPensionAndOtherPostretirementBenefitPlansNetPriorServiceCostRecognizedInNetPeriodicBenefitCostBeforeTax	900000
CY2012Q3	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	-0.01
CY2012Q3	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Gain Loss Included In Earnings1 FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1	-100000
CY2012Q3	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Purchases FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases	100000
CY2012Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	62900000
CY2012Q3	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	1200000
CY2012Q3	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	-32100000
CY2012Q3	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	40900000
CY2012Q3	us-gaap	Gain Loss On Investments GainLossOnInvestments	5000000
CY2012Q3	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	101300000
CY2012Q3	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	-16900000
CY2012Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.89
CY2012Q3	us-gaap	Fees And Commissions FeesAndCommissions	12500000
CY2012Q3	us-gaap	Other Than Temporary Impairment Losses Investments Portion In Other Comprehensive Income Loss Before Tax Including Portion Attributable To Noncontrolling Interest Availableforsale Securities OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxIncludingPortionAttributableToNoncontrollingInterestAvailableforsaleSecurities	800000
CY2012Q3	us-gaap	Premiums Earned Net Property And Casualty PremiumsEarnedNetPropertyAndCasualty	1154300000
CY2012Q3	us-gaap	Business Combination Acquisition Related Costs BusinessCombinationAcquisitionRelatedCosts	-200000
CY2012Q3	us-gaap	Other Comprehensive Income Loss Foreign Currency Translation Adjustment Tax OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax	4100000
CY2012Q3	us-gaap	Deferred Policy Acquisition Cost Amortization Expense DeferredPolicyAcquisitionCostAmortizationExpense	235800000
CY2012Q3	us-gaap	Segment Reporting Information Revenue SegmentReportingInformationRevenue	1152700000
CY2012Q3	us-gaap	Income Loss From Discontinued Operations Net Of Tax IncomeLossFromDiscontinuedOperationsNetOfTax	-500000
CY2012Q3	us-gaap	Benefits Losses And Expenses BenefitsLossesAndExpenses	1104500000
CY2012Q3	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-1600000
CY2012Q3	us-gaap	Other Comprehensive Income Reclassification Of Defined Benefit Plans Net Gain Loss Recognized In Net Periodic Benefit Cost Before Tax OtherComprehensiveIncomeReclassificationOfDefinedBenefitPlansNetGainLossRecognizedInNetPeriodicBenefitCostBeforeTax	3300000
CY2012Q3	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Gain Loss Included In Other Comprehensive Income Loss FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss	800000
CY2012Q3	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Reductions Change In Status OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsReductionsChangeInStatus	200000
CY2012Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	45200000	shares
CY2012Q3	us-gaap	Other Than Temporary Impairment Losses Investments Availableforsale Securities OtherThanTemporaryImpairmentLossesInvestmentsAvailableforsaleSecurities	1400000
CY2012Q3	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	7500000
CY2012Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	53200000
CY2012Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	60900000
CY2012Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.91
CY2012Q3	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment For Sale Of Securities Included In Net Income Tax OtherComprehensiveIncomeLossReclassificationAdjustmentForSaleOfSecuritiesIncludedInNetIncomeTax	-2700000
CY2012Q3	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	90900000
CY2012Q3	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment For Sale Of Securities Included In Net Income Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentForSaleOfSecuritiesIncludedInNetIncomeNetOfTax	-7000000
CY2012Q3	us-gaap	Discontinued Operation Tax Effect Of Discontinued Operation DiscontinuedOperationTaxEffectOfDiscontinuedOperation	300000
CY2012Q3	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.92
CY2012Q3	us-gaap	Interest Expense Debt InterestExpenseDebt	14600000
CY2012Q3	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Before Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax	11600000
CY2012Q3	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment For Sale Of Securities Included In Net Income Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentForSaleOfSecuritiesIncludedInNetIncomeBeforeTax	-4300000
CY2012Q3	us-gaap	Policyholder Benefits And Claims Incurred Net PolicyholderBenefitsAndClaimsIncurredNet	708400000
CY2012Q3	us-gaap	Allocated Share Based Compensation Expense Net Of Tax AllocatedShareBasedCompensationExpenseNetOfTax	2300000
CY2012Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	44600000	shares
CY2012Q3	us-gaap	Premiums Earned Net PremiumsEarnedNet	1071000000
CY2012Q3	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	-800000
CY2012Q3	us-gaap	Other Than Temporary Impairment Losses Investments Portion Recognized In Earnings Net OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet	2200000
CY2012Q3	us-gaap	Revenues Revenues	1157700000
CY2012Q3	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax	-2400000
CY2012Q3	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	3500000
CY2012Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	48300000
CY2012Q3	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax	-34800000
CY2012Q3	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Additions No Previous Impairment OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsAdditionsNoPreviousImpairment	100000
CY2012Q3	us-gaap	Revenues From Transactions With Other Operating Segments Of Same Entity RevenuesFromTransactionsWithOtherOperatingSegmentsOfSameEntity	-1600000
CY2012Q3	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Reductions Securities Sold OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsReductionsSecuritiesSold	2500000
CY2012Q3	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	145700000
CY2012Q3	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	29200000
CY2012Q3	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	2100000	shares
CY2012Q3	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Before Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax	86600000
CY2012Q3	us-gaap	Net Income Loss NetIncomeLoss	40400000
CY2012Q3	us-gaap	Foreign Currency Transaction Gain Loss Before Tax ForeignCurrencyTransactionGainLossBeforeTax	-1000000
CY2012Q3	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Transfers Into Level3 FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersIntoLevel3	2600000
CY2012Q3	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Sales FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales	900000
CY2012Q3	us-gaap	Foreign Currency Transaction Gain Loss Realized ForeignCurrencyTransactionGainLossRealized	-300000
CY2012Q3	us-gaap	Net Investment Income NetInvestmentIncome	69200000
CY2012Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	12300000
CY2012Q3	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.90
CY2012Q3	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	58800000
CY2012Q3	us-gaap	Realized Investment Gains Losses RealizedInvestmentGainsLosses	7200000
CY2012Q3	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	51800000
CY2012Q3	thg	Contribution To Charitable Foundation ContributionToCharitableFoundation	1700000
CY2012Q3	thg	Other Comprehensive Income Net Unrealized Gains And Losses On Securities Before Tax OtherComprehensiveIncomeNetUnrealizedGainsAndLossesOnSecuritiesBeforeTax	86600000
CY2012Q3	thg	Other Comprehensive Income Net Unrealized Gains And Losses On Securities Tax OtherComprehensiveIncomeNetUnrealizedGainsAndLossesOnSecuritiesTax	34800000
CY2012Q3	thg	Other Comprehensive Income Net Unrealized Gains And Losses On Securities Net Of Tax OtherComprehensiveIncomeNetUnrealizedGainsAndLossesOnSecuritiesNetOfTax	51800000
CY2012Q3	thg	Other Temporary Impairment Losses Investments Portion In Other Comprehensive Income Loss Before Taxes OtherTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxes	3700000
CY2012Q3	thg	Other Comprehensive Income Appreciation On Securities During Period Net Of Tax OtherComprehensiveIncomeAppreciationOnSecuritiesDuringPeriodNetOfTax	82900000
CY2012Q3	thg	Per Share Effect Of Dilutive Securities On Income From Continuing Operations And Net Income PerShareEffectOfDilutiveSecuritiesOnIncomeFromContinuingOperationsAndNetIncome	20000
CY2012Q3	thg	Other Comprehensive Income Loss Net Unrealized Gains And Losses On Securities Tax OtherComprehensiveIncomeLossNetUnrealizedGainsAndLossesOnSecuritiesTax	34800000
CY2012Q3	thg	Other Comprehensive Income Loss Net Unrealized Gains And Losses On Securities Net Of Tax OtherComprehensiveIncomeLossNetUnrealizedGainsAndLossesOnSecuritiesNetOfTax	51800000

Files In Submission

Name	View Source	Status
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0001193125-12-446614-index.html	Edgar Link	pending
0001193125-12-446614.txt	Edgar Link	pending
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d402214d10q.htm	Edgar Link	pending
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Financial_Report.xls	Edgar Link	pending
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report.css	Edgar Link	pending
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thg-20120930.xml	Edgar Link	completed
thg-20120930.xsd	Edgar Link	pending
thg-20120930_cal.xml	Edgar Link	unprocessable
thg-20120930_def.xml	Edgar Link	unprocessable
thg-20120930_lab.xml	Edgar Link	unprocessable
thg-20120930_pre.xml	Edgar Link	unprocessable

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2012 Q4 Form 10-Q Financial Statement

#000119312512446614 Filed on November 01, 2012

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$THG Hanover Insurance Group Inc Stock $thg

2012 Q4 Form 10-Q Financial Statement

#000119312512446614 Filed on November 01, 2012

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$THG
Hanover Insurance Group Inc Stock $thg