$UNM
Unum Group Stock $unm

$unm Overview Financials Valuation SEC Filings Company Website

2022 Q4 Form 10-Q Financial Statement

#000000551322000156 Filed on November 02, 2022

Income Statement

Concept	2022 Q4	2022 Q3	2021 Q3
Revenue	$3.006B	$2.962B	$2.970B
YoY Change	0.89%	-0.26%	-0.89%
Cost Of Revenue		$1.579B	$1.754B
YoY Change		-9.95%	-7.13%
Gross Profit		$1.383B	$1.216B
YoY Change		13.72%	9.76%
Gross Profit Margin		46.68%	40.94%
Selling, General & Admin	$295.4M	$285.9M	$241.6M
YoY Change	18.49%	18.34%	5.04%
% of Gross Profit		20.68%	19.87%
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$27.00M	$150.8M	$30.40M
YoY Change	-9.4%	396.05%	-79.69%
% of Gross Profit		10.91%	2.5%
Operating Expenses	$2.598B	$2.395B	$2.515B
YoY Change	-5.09%	-4.76%	-4.15%
Operating Profit		-$1.013B	-$1.299B
YoY Change		-22.05%	-14.31%
Interest Expense	-$47.20M	-$47.00M	-$44.70M
YoY Change	-6.72%	5.15%	-9.51%
% of Operating Profit
Other Income/Expense, Net
YoY Change
Pretax Income	$360.9M	$515.3M	$409.9M
YoY Change	88.26%	25.71%	36.82%
Income Tax	$81.30M	$104.6M	$81.30M
% Of Pretax Income	22.53%	20.3%	19.83%
Net Earnings	$279.6M	$410.7M	$328.6M
YoY Change	75.08%	24.98%	42.19%
Net Earnings / Revenue	9.3%	13.87%	11.07%
Basic Earnings Per Share		$2.05	$1.61
Diluted Earnings Per Share	$1.39	$2.04	$1.602M
COMMON SHARES
Basic Shares Outstanding	198.9M shares	200.0M shares	204.4M shares
Diluted Shares Outstanding		201.7M shares	205.1M shares

Balance Sheet

Concept	2022 Q4	2022 Q3	2021 Q3
SHORT-TERM ASSETS
Cash & Short-Term Investments
YoY Change
Cash & Equivalents	$119.2M	$143.3M	$121.7M
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	$451.7M	$442.4M	$462.5M
YoY Change	-2.38%	-4.35%	-9.1%
Goodwill	$347.6M	$344.4M
YoY Change	-1.31%
Intangibles
YoY Change
Long-Term Investments	$43.71B	$42.88B	$52.42B
YoY Change	-16.18%	-18.2%	-10.19%
Other Assets	$449.8M	$523.1M
YoY Change
Total Long-Term Assets
YoY Change
TOTAL ASSETS
Total Short-Term Assets
Total Long-Term Assets
Total Assets	$61.43B	$60.87B	$70.60B
YoY Change	-12.38%	-13.78%	1.41%
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	$2.000M
YoY Change
Total Short-Term Liabilities	$192.9M	$212.2M	$40.70M
YoY Change	21.24%	421.38%	-91.15%
LONG-TERM LIABILITIES
Long-Term Debt	$3.428B	$3.429B	$3.441B
YoY Change	-0.42%	-0.35%	1.85%
Other Long-Term Liabilities	$2.334B	$2.529B	$2.999B
YoY Change	-9.73%	-15.67%	50.12%
Total Long-Term Liabilities	$3.428B	$5.958B	$6.441B
YoY Change	-0.42%	-7.49%	19.78%
TOTAL LIABILITIES
Total Short-Term Liabilities	$192.9M	$212.2M	$40.70M
Total Long-Term Liabilities	$3.428B	$5.958B	$6.441B
Total Liabilities	$52.24B	$52.21B	$59.48B
YoY Change	-11.01%	-12.23%	1.29%
SHAREHOLDERS EQUITY
Retained Earnings	$12.91B	$12.70B
YoY Change	8.93%
Common Stock	$2.472B	$2.463B
YoY Change	1.35%
Preferred Stock
YoY Change
Treasury Stock (at cost)	$3.430B	$3.367B
YoY Change	6.2%
Treasury Stock Shares	110.6M shares	109.1M shares
Shareholders Equity	$9.198B	$8.660B	$11.12B
YoY Change
Total Liabilities & Shareholders Equity	$61.43B	$60.87B	$70.60B
YoY Change	-12.38%	-13.78%	1.41%

Cashflow Statement

Concept	2022 Q4	2022 Q3	2021 Q3
OPERATING ACTIVITIES
Net Income	$279.6M	$410.7M	$328.6M
YoY Change	75.08%	24.98%	42.19%
Depreciation, Depletion And Amortization	$27.00M	$150.8M	$30.40M
YoY Change	-9.4%	396.05%	-79.69%
Cash From Operating Activities	$356.9M	$277.2M	$455.1M
YoY Change	-8.06%	-39.09%	6.73%
INVESTING ACTIVITIES
Capital Expenditures	$31.40M	-$26.40M	-$24.80M
YoY Change	-212.54%	6.45%	12.73%
Acquisitions
YoY Change
Other Investing Activities	-$233.3M	-$150.5M	-$374.3M
YoY Change	-42.66%	-59.79%	-1756.19%
Cash From Investing Activities	-$264.7M	-$176.9M	-$399.1M
YoY Change	-39.12%	-55.68%	-66616.67%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	-116.3M	-108.4M	-57.40M
YoY Change	116200.0%	88.85%	-88.26%
NET CHANGE
Cash From Operating Activities	356.9M	277.2M	455.1M
Cash From Investing Activities	-264.7M	-176.9M	-399.1M
Cash From Financing Activities	-116.3M	-108.4M	-57.40M
Net Change In Cash	-24.10M	-8.100M	-1.400M
YoY Change	-48.39%	478.57%	-97.73%
FREE CASH FLOW
Cash From Operating Activities	$356.9M	$277.2M	$455.1M
Capital Expenditures	$31.40M	-$26.40M	-$24.80M
Free Cash Flow	$325.5M	$303.6M	$479.9M
YoY Change	-21.77%	-36.74%	7.02%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2022
	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	Q3
	dei	Amendment Flag AmendmentFlag	false
	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
	dei	Document Type DocumentType	10-Q
	dei	Document Quarterly Report DocumentQuarterlyReport	true
	dei	Document Transition Report DocumentTransitionReport	false
	dei	Entity File Number EntityFileNumber	001-11294
	dei	Entity Registrant Name EntityRegistrantName	Unum Group
	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	62-1598430
	dei	Entity Address Address Line1 EntityAddressAddressLine1	1 Fountain Square
	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	37402
	dei	City Area Code CityAreaCode	423
	dei	Local Phone Number LocalPhoneNumber	294-1011
	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
	dei	Entity Shell Company EntityShellCompany	false
CY2022Q4	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	198940884	shares
CY2021Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	37386700000	usd
CY2022Q3	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss DebtSecuritiesAvailableForSaleAllowanceForCreditLoss	4600000	usd
CY2021Q4	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss DebtSecuritiesAvailableForSaleAllowanceForCreditLoss	0	usd
CY2022Q3	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	34148200000	usd
CY2022Q3	us-gaap	Allowance For Loan And Lease Losses Real Estate AllowanceForLoanAndLeaseLossesRealEstate	8700000	usd
CY2022Q3	us-gaap	Mortgage Loans On Real Estate Commercial And Consumer Net MortgageLoansOnRealEstateCommercialAndConsumerNet	2476400000	usd
CY2021Q4	us-gaap	Mortgage Loans On Real Estate Commercial And Consumer Net MortgageLoansOnRealEstateCommercialAndConsumerNet	2560400000	usd
CY2022Q3	us-gaap	Other Long Term Investments OtherLongTermInvestments	1430400000	usd
CY2022Q3	us-gaap	Investments Investments	42879000000	usd
CY2021Q4	us-gaap	Investments Investments	52150300000	usd
CY2021Q4	us-gaap	Premiums And Other Receivables Net PremiumsAndOtherReceivablesNet	1519900000	usd
CY2022Q3	us-gaap	Reinsurance Recoverables Allowance ReinsuranceRecoverablesAllowance	2300000	usd
CY2021Q4	us-gaap	Reinsurance Recoverables Allowance ReinsuranceRecoverablesAllowance	2300000	usd
CY2022Q3	us-gaap	Reinsurance Recoverables ReinsuranceRecoverables	10289700000	usd
CY2022Q3	us-gaap	Deferred Policy Acquisition Costs DeferredPolicyAcquisitionCosts	2254600000	usd
CY2021Q4	us-gaap	Deferred Policy Acquisition Costs DeferredPolicyAcquisitionCosts	2207900000	usd
CY2022Q3	us-gaap	Goodwill Goodwill	344400000	usd
CY2021Q4	us-gaap	Goodwill Goodwill	352200000	usd
CY2022Q3	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	442400000	usd
CY2021Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	462700000	usd
CY2021Q4	us-gaap	Deferred Income Tax Assets Net DeferredIncomeTaxAssetsNet	0	usd
CY2022Q3	us-gaap	Other Assets OtherAssets	1797600000	usd
CY2021Q4	us-gaap	Other Assets OtherAssets	1825600000	usd
CY2022Q3	us-gaap	Assets Assets	60866700000	usd
CY2022Q3	unm	Policy And Contract Benefits PolicyAndContractBenefits	1771400000	usd
CY2021Q4	unm	Policy And Contract Benefits PolicyAndContractBenefits	1907700000	usd
CY2022Q3	us-gaap	Liability For Future Policy Benefits And Unpaid Claims And Claims Adjustment Expense LiabilityForFuturePolicyBenefitsAndUnpaidClaimsAndClaimsAdjustmentExpense	42108700000	usd
CY2021Q4	us-gaap	Unearned Premiums UnearnedPremiums	347500000	usd
CY2022Q3	us-gaap	Other Policyholder Funds OtherPolicyholderFunds	1756000000	usd
CY2021Q4	us-gaap	Other Policyholder Funds OtherPolicyholderFunds	1790900000	usd
CY2022Q3	us-gaap	Taxes Payable Current And Noncurrent TaxesPayableCurrentAndNoncurrent	212200000	usd
CY2021Q4	us-gaap	Taxes Payable Current And Noncurrent TaxesPayableCurrentAndNoncurrent	159100000	usd
CY2021Q4	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	458400000	usd
CY2022Q3	us-gaap	Long Term Debt And Capital Lease Obligations LongTermDebtAndCapitalLeaseObligations	3429200000	usd
CY2022Q3	us-gaap	Common Stock Value CommonStockValue	30800000	usd
CY2021Q4	us-gaap	Common Stock Value CommonStockValue	30700000	usd
CY2022Q3	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	2432300000	usd
CY2021Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	2408100000	usd
CY2022Q3	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-3134700000	usd
CY2021Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	354100000	usd
CY2021Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	11853200000	usd
CY2022Q3	us-gaap	Treasury Stock Shares TreasuryStockShares	109064105	shares
CY2022Q3	us-gaap	Treasury Stock Value TreasuryStockValue	3367200000	usd
CY2021Q4	us-gaap	Treasury Stock Value TreasuryStockValue	3229700000	usd
CY2022Q3	us-gaap	Stockholders Equity StockholdersEquity	8659500000	usd
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CY2022Q3	us-gaap	Premiums Earned Net PremiumsEarnedNet	2391700000	usd
CY2021Q3	us-gaap	Premiums Earned Net PremiumsEarnedNet	2353700000	usd
	us-gaap	Premiums Earned Net PremiumsEarnedNet	7212300000	usd
	us-gaap	Premiums Earned Net PremiumsEarnedNet	7106400000	usd
CY2022Q3	us-gaap	Net Investment Income NetInvestmentIncome	511600000	usd
	us-gaap	Net Investment Income NetInvestmentIncome	1662400000	usd
	us-gaap	Other Income OtherIncome	180500000	usd
CY2021Q3	us-gaap	Gain Loss On Investments GainLossOnInvestments	-100000	usd
	us-gaap	Gain Loss On Investments GainLossOnInvestments	85400000	usd
CY2022Q3	us-gaap	Other Income OtherIncome	63000000.0	usd
CY2021Q3	us-gaap	Other Income OtherIncome	65900000	usd
	us-gaap	Other Income OtherIncome	197500000	usd
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	us-gaap	Revenues Revenues	8985300000	usd
	us-gaap	Revenues Revenues	9034700000	usd
CY2022Q3	us-gaap	Policyholder Benefits And Claims Incurred Net PolicyholderBenefitsAndClaimsIncurredNet	1579300000	usd
CY2021Q3	us-gaap	Policyholder Benefits And Claims Incurred Net PolicyholderBenefitsAndClaimsIncurredNet	1753900000	usd
	us-gaap	Policyholder Benefits And Claims Incurred Net PolicyholderBenefitsAndClaimsIncurredNet	5181300000	usd
	us-gaap	Policyholder Benefits And Claims Incurred Net PolicyholderBenefitsAndClaimsIncurredNet	5659200000	usd
CY2021Q3	us-gaap	Insurance Commissions InsuranceCommissions	258300000	usd
	us-gaap	Insurance Commissions InsuranceCommissions	819100000	usd
	us-gaap	Insurance Commissions InsuranceCommissions	777900000	usd
CY2021Q3	unm	Cost Related To Early Retirement Of Debt CostRelatedToEarlyRetirementOfDebt	0	usd
	unm	Cost Related To Early Retirement Of Debt CostRelatedToEarlyRetirementOfDebt	4200000	usd
	unm	Cost Related To Early Retirement Of Debt CostRelatedToEarlyRetirementOfDebt	67300000	usd
CY2022Q3	us-gaap	Increase Decrease In Deferred Policy Acquisition Costs IncreaseDecreaseInDeferredPolicyAcquisitionCosts	139400000	usd
CY2021Q3	us-gaap	Increase Decrease In Deferred Policy Acquisition Costs IncreaseDecreaseInDeferredPolicyAcquisitionCosts	128600000	usd
	us-gaap	Increase Decrease In Deferred Policy Acquisition Costs IncreaseDecreaseInDeferredPolicyAcquisitionCosts	419100000	usd
	us-gaap	Increase Decrease In Deferred Policy Acquisition Costs IncreaseDecreaseInDeferredPolicyAcquisitionCosts	388900000	usd
CY2021Q3	us-gaap	Deferred Policy Acquisition Cost Amortization Expense DeferredPolicyAcquisitionCostAmortizationExpense	138400000	usd
	us-gaap	Deferred Policy Acquisition Cost Amortization Expense DeferredPolicyAcquisitionCostAmortizationExpense	449500000	usd
	us-gaap	Deferred Policy Acquisition Cost Amortization Expense DeferredPolicyAcquisitionCostAmortizationExpense	440800000	usd
CY2022Q3	us-gaap	Labor And Related Expense LaborAndRelatedExpense	285900000	usd
CY2021Q3	us-gaap	Labor And Related Expense LaborAndRelatedExpense	241600000	usd
	us-gaap	Labor And Related Expense LaborAndRelatedExpense	794100000	usd
	us-gaap	Labor And Related Expense LaborAndRelatedExpense	725900000	usd
CY2021Q3	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	251500000	usd
CY2021Q3	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	34800000	usd
	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	42400000	usd
CY2022Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	104600000	usd
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	235900000	usd
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	206800000	usd
CY2022Q3	us-gaap	Net Income Loss NetIncomeLoss	410700000	usd
CY2021Q3	us-gaap	Net Income Loss NetIncomeLoss	328600000	usd
	us-gaap	Net Income Loss NetIncomeLoss	1034600000	usd
	us-gaap	Net Income Loss NetIncomeLoss	664500000	usd
CY2022Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.05
CY2021Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.61
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	5.14
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.25
CY2021Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.60
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	5.11
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	3.24
CY2022Q3	us-gaap	Net Income Loss NetIncomeLoss	410700000	usd
CY2021Q3	us-gaap	Net Income Loss NetIncomeLoss	328600000	usd
	us-gaap	Net Income Loss NetIncomeLoss	1034600000	usd
	us-gaap	Net Income Loss NetIncomeLoss	664500000	usd
CY2021Q3	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax	-69000000.0	usd
	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax	-2017200000	usd
	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax	-276300000	usd
CY2022Q3	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	-1925800000	usd
CY2021Q3	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	-260800000	usd
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CY2021Q3	unm	Change In Adjustment To Deferred Acquisition Costs And Reserves For Future Policy And Contract Benefits Net Of Reinsurance Tax Expense ChangeInAdjustmentToDeferredAcquisitionCostsAndReservesForFuturePolicyAndContractBenefitsNetOfReinsuranceTaxExpense	49500000	usd
	unm	Change In Adjustment To Deferred Acquisition Costs And Reserves For Future Policy And Contract Benefits Net Of Reinsurance Tax Expense ChangeInAdjustmentToDeferredAcquisitionCostsAndReservesForFuturePolicyAndContractBenefitsNetOfReinsuranceTaxExpense	1141700000	usd
	unm	Change In Adjustment To Deferred Acquisition Costs And Reserves For Future Policy And Contract Benefits Net Of Reinsurance Tax Expense ChangeInAdjustmentToDeferredAcquisitionCostsAndReservesForFuturePolicyAndContractBenefitsNetOfReinsuranceTaxExpense	215500000	usd
CY2022Q3	unm	Change In Adjustment To Deferred Acquisition Costs And Reserves For Future Policy And Contract Benefits Net Of Reinsurance And Net Of Tax Expense Benefit ChangeInAdjustmentToDeferredAcquisitionCostsAndReservesForFuturePolicyAndContractBenefitsNetOfReinsuranceAndNetOfTaxExpenseBenefit	661400000	usd
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	unm	Other Comprehensive Income Loss Net Gain On Hedges Adjustment Tax OtherComprehensiveIncomeLossNetGainOnHedgesAdjustmentTax	-12600000	usd
	unm	Other Comprehensive Income Loss Net Gain On Hedges Adjustment Tax OtherComprehensiveIncomeLossNetGainOnHedgesAdjustmentTax	-7600000	usd
CY2022Q3	unm	Other Comprehensive Income Loss Net Gain On Hedges Adjustment Net Of Tax OtherComprehensiveIncomeLossNetGainOnHedgesAdjustmentNetOfTax	-32900000	usd
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	unm	Other Comprehensive Income Loss Net Gain On Hedges Adjustment Net Of Tax OtherComprehensiveIncomeLossNetGainOnHedgesAdjustmentNetOfTax	-48300000	usd
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	us-gaap	Other Comprehensive Income Loss Foreign Currency Translation Adjustment Tax OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax	11500000	usd
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	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-15100000	usd
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	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-260300000	usd
CY2022Q3	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	-951800000	usd
CY2021Q3	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	220400000	usd
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	-2454200000	usd
CY2022Q3	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.330
CY2021Q3	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.300
	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.930
	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.870
CY2022Q3	us-gaap	Stockholders Equity StockholdersEquity	8659500000	usd
CY2021Q3	us-gaap	Stockholders Equity StockholdersEquity	11118200000	usd
CY2022Q3	us-gaap	Stockholders Equity StockholdersEquity	8659500000	usd
	us-gaap	Net Income Loss NetIncomeLoss	1034600000	usd
	us-gaap	Net Income Loss NetIncomeLoss	664500000	usd
	us-gaap	Increase Decrease In Receivables IncreaseDecreaseInReceivables	-437800000	usd
	us-gaap	Increase Decrease In Receivables IncreaseDecreaseInReceivables	-427200000	usd
	us-gaap	Deferred Policy Acquisition Costs Period Increase Decrease DeferredPolicyAcquisitionCostsPeriodIncreaseDecrease	-30400000	usd
	us-gaap	Deferred Policy Acquisition Costs Period Increase Decrease DeferredPolicyAcquisitionCostsPeriodIncreaseDecrease	-51900000	usd
	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	90000000.0	usd
	unm	Net Cash Paid In Relation To Reinsurance Agreement NetCashPaidInRelationToReinsuranceAgreement	0	usd
	unm	Net Cash Paid In Relation To Reinsurance Agreement NetCashPaidInRelationToReinsuranceAgreement	456800000	usd
	us-gaap	Increase Decrease In Prepaid Reinsurance Premiums IncreaseDecreaseInPrepaidReinsurancePremiums	-48500000	usd
	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	20200000	usd
	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-59800000	usd
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	1061800000	usd
	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	322300000	usd
	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	1125600000	usd
	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	1976600000	usd
	us-gaap	Proceeds From Sale And Maturity Of Other Investments ProceedsFromSaleAndMaturityOfOtherInvestments	306400000	usd
	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	2380500000	usd
	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	3123500000	usd
CY2022Q3	us-gaap	Qualified Affordable Housing Project Investments Commitment QualifiedAffordableHousingProjectInvestmentsCommitment	700000	usd
	us-gaap	Payments For Proceeds From Short Term Investments PaymentsForProceedsFromShortTermInvestments	-204900000	usd
	us-gaap	Payments For Proceeds From Short Term Investments PaymentsForProceedsFromShortTermInvestments	-67100000	usd
	us-gaap	Increase Decrease In Cash Collateral For Loaned Securities IncreaseDecreaseInCashCollateralForLoanedSecurities	12500000	usd
	us-gaap	Increase Decrease In Cash Collateral For Loaned Securities IncreaseDecreaseInCashCollateralForLoanedSecurities	50000000.0	usd
	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	70800000	usd
	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	82400000	usd
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-691200000	usd
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-905800000	usd
	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	349200000	usd
	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	588100000	usd
	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	364000000.0	usd
	us-gaap	Payments Of Debt Extinguishment Costs PaymentsOfDebtExtinguishmentCosts	3600000	usd
	us-gaap	Payments Of Debt Extinguishment Costs PaymentsOfDebtExtinguishmentCosts	62800000	usd
	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	2700000	usd
	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	136100000	usd
	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	0	usd
	us-gaap	Payments Of Dividends PaymentsOfDividends	188400000	usd
	us-gaap	Payments Of Dividends PaymentsOfDividends	178000000.0	usd
	us-gaap	Additions To Contract Holders Funds AdditionsToContractHoldersFunds	90900000	usd
	us-gaap	Additions To Contract Holders Funds AdditionsToContractHoldersFunds	97500000	usd
	us-gaap	Withdrawal From Contract Holders Funds WithdrawalFromContractHoldersFunds	55600000	usd
	us-gaap	Withdrawal From Contract Holders Funds WithdrawalFromContractHoldersFunds	62700000	usd
	unm	Cash Received Related To Active Life Volatility Cover Agreement Reinsurance Agreement CashReceivedRelatedToActiveLifeVolatilityCoverAgreementReinsuranceAgreement	5200000	usd
	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-2600000	usd
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-76900000	usd
	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-75300000	usd
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	197000000.0	usd
CY2022Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	143300000	usd
CY2021Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	121700000	usd
CY2022Q3	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	34148200000	usd
CY2021Q3	us-gaap	Gains Losses On Sales Of Other Real Estate GainsLossesOnSalesOfOtherRealEstate	0	usd
CY2022Q3	us-gaap	Assets Fair Value Disclosure AssetsFairValueDisclosure	35441100000	usd
CY2022Q3	us-gaap	Derivative Liabilities DerivativeLiabilities	75800000	usd
CY2022Q3	us-gaap	Liabilities Fair Value Disclosure LiabilitiesFairValueDisclosure	75800000	usd
CY2021Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	43336000000	usd
CY2021Q4	us-gaap	Derivative Assets DerivativeAssets	39500000	usd
CY2021Q4	us-gaap	Equity Securities Fv Ni EquitySecuritiesFvNi	33700000	usd
CY2021Q4	us-gaap	Assets Fair Value Disclosure AssetsFairValueDisclosure	44387800000	usd
CY2021Q4	us-gaap	Derivative Liabilities DerivativeLiabilities	65100000	usd
CY2021Q4	us-gaap	Liabilities Fair Value Disclosure LiabilitiesFairValueDisclosure	65100000	usd
CY2022Q3	unm	Policy Loans Cededto Reinsurers PolicyLoansCededtoReinsurers	3354600000	usd
CY2021Q4	unm	Policy Loans Cededto Reinsurers PolicyLoansCededtoReinsurers	3373700000	usd
CY2022Q3	unm	Available For Sale Securities Debt Maturities Within One Year Unrealized Gain Position Gross Gain AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearUnrealizedGainPositionGrossGain	3800000	usd
CY2022Q3	unm	Available For Sale Securities Debt Maturities Within One Year Unrealized Loss Position Gross Loss AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearUnrealizedLossPositionGrossLoss	9200000	usd
CY2022Q3	unm	Debt Securities Available For Sale Amortized Cost Maturity Allocated And Single Maturity Date After Year One Through Five Net DebtSecuritiesAvailableForSaleAmortizedCostMaturityAllocatedAndSingleMaturityDateAfterYearOneThroughFiveNet	6680400000	usd
CY2022Q3	unm	Available For Sale Securities Debt Maturities After One Through Five Years Unrealized Gain Position Gross Gain AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsUnrealizedGainPositionGrossGain	74800000	usd
CY2022Q3	unm	Available For Sale Securities Debt Maturities After One Through Five Years Unrealized Loss Position Gross Loss AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsUnrealizedLossPositionGrossLoss	268200000	usd
CY2022Q3	unm	Available For Sale Securities Debt Maturities After Five Through Ten Years Unrealized Gain Position Gross Gain AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsUnrealizedGainPositionGrossGain	267700000	usd
CY2022Q3	unm	Available For Sale Securities Debt Maturities After Five Through Ten Years Unrealized Loss Position Gross Loss AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsUnrealizedLossPositionGrossLoss	1013300000	usd
CY2022Q3	unm	Debt Securities Available For Sale Amortized Cost Maturity Allocated And Single Maturity Date After Year10 Net DebtSecuritiesAvailableForSaleAmortizedCostMaturityAllocatedAndSingleMaturityDateAfterYear10Net	18869800000	usd
CY2022Q3	unm	Available For Sale Securities Debt Maturities After Ten Years Unrealized Gain Position Gross Gain AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsUnrealizedGainPositionGrossGain	284800000	usd
CY2022Q3	unm	Available For Sale Securities Debt Maturities After Ten Years Unrealized Loss Position Gross Loss AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsUnrealizedLossPositionGrossLoss	2884300000	usd
CY2022Q3	unm	Available For Sale Securities Debt Maturities Amortized Cost Gross Subtotal Net AvailableForSaleSecuritiesDebtMaturitiesAmortizedCostGrossSubtotalNet	37161800000	usd
CY2022Q3	unm	Available For Sale Securities Debt Maturities Unrealized Gain Position Gross Gain Gross Subtotal AvailableForSaleSecuritiesDebtMaturitiesUnrealizedGainPositionGrossGainGrossSubtotal	631100000	usd
CY2022Q3	unm	Available For Sale Securities Debt Maturities Unrealized Gain Position Gross Loss Gross Subtotal AvailableForSaleSecuritiesDebtMaturitiesUnrealizedGainPositionGrossLossGrossSubtotal	4175000000	usd
CY2022Q3	unm	Available For Sale Securities Debt Maturities Without Single Maturity Date Unrealized Loss Position Gross Loss AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateUnrealizedLossPositionGrossLoss	32100000	usd
CY2022Q3	unm	Debt Securities Available For Sale Amortized Cost Net Of Allowance For Credit Losses DebtSecuritiesAvailableForSaleAmortizedCostNetOfAllowanceForCreditLosses	37716800000	usd
CY2022Q3	unm	Availableforsale Securities Debt Maturities Unrealized Gain Position Gross Gain AvailableforsaleSecuritiesDebtMaturitiesUnrealizedGainPositionGrossGain	638500000	usd
CY2022Q3	unm	Available For Sale Securities Unrealized Loss Position Gross Loss Subtotal AvailableForSaleSecuritiesUnrealizedLossPositionGrossLossSubtotal	4207100000	usd
CY2021Q4	unm	Debt Securities Available For Sale Amortized Cost Maturity Allocated And Single Maturity Date Year One Net DebtSecuritiesAvailableForSaleAmortizedCostMaturityAllocatedAndSingleMaturityDateYearOneNet	767300000	usd
CY2021Q4	unm	Available For Sale Securities Debt Maturities Within One Year Unrealized Loss Position Gross Loss AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearUnrealizedLossPositionGrossLoss	100000	usd
CY2021Q4	unm	Debt Securities Available For Sale Amortized Cost Maturity Allocated And Single Maturity Date After Year One Through Five Net DebtSecuritiesAvailableForSaleAmortizedCostMaturityAllocatedAndSingleMaturityDateAfterYearOneThroughFiveNet	6613200000	usd
CY2021Q4	unm	Available For Sale Securities Debt Maturities After One Through Five Years Unrealized Gain Position Gross Gain AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsUnrealizedGainPositionGrossGain	540200000	usd
CY2021Q4	unm	Available For Sale Securities Debt Maturities After One Through Five Years Unrealized Loss Position Gross Loss AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsUnrealizedLossPositionGrossLoss	6000000.0	usd
CY2021Q4	unm	Debt Securities Available For Sale Amortized Cost Maturity Allocated And Single Maturity Date After Year5 Through10 Net DebtSecuritiesAvailableForSaleAmortizedCostMaturityAllocatedAndSingleMaturityDateAfterYear5Through10Net	10614300000	usd
CY2021Q4	unm	Available For Sale Securities Debt Maturities After Five Through Ten Years Unrealized Gain Position Gross Gain AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsUnrealizedGainPositionGrossGain	1453300000	usd
CY2021Q4	unm	Available For Sale Securities Debt Maturities After Five Through Ten Years Unrealized Loss Position Gross Loss AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsUnrealizedLossPositionGrossLoss	26000000.0	usd
CY2021Q4	unm	Debt Securities Available For Sale Amortized Cost Maturity Allocated And Single Maturity Date After Year10 Net DebtSecuritiesAvailableForSaleAmortizedCostMaturityAllocatedAndSingleMaturityDateAfterYear10Net	18804000000	usd
CY2021Q4	unm	Available For Sale Securities Debt Maturities Amortized Cost Gross Subtotal Net AvailableForSaleSecuritiesDebtMaturitiesAmortizedCostGrossSubtotalNet	36798800000	usd
CY2021Q4	unm	Available For Sale Securities Debt Maturities Unrealized Gain Position Gross Gain Gross Subtotal AvailableForSaleSecuritiesDebtMaturitiesUnrealizedGainPositionGrossGainGrossSubtotal	5999000000	usd
CY2021Q4	unm	Available For Sale Securities Debt Maturities Unrealized Gain Position Gross Loss Gross Subtotal AvailableForSaleSecuritiesDebtMaturitiesUnrealizedGainPositionGrossLossGrossSubtotal	100100000	usd
CY2021Q4	unm	Debt Securities Available For Sale Maturity Without Single Maturity Date Amortized Cost Net DebtSecuritiesAvailableForSaleMaturityWithoutSingleMaturityDateAmortizedCostNet	587900000	usd
CY2021Q4	unm	Available For Sale Securities Debt Maturities Without Single Maturity Date Unrealized Gain Position Gross Gain AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateUnrealizedGainPositionGrossGain	50400000	usd
CY2021Q4	unm	Available For Sale Securities Debt Maturities Without Single Maturity Date Unrealized Loss Position Gross Loss AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateUnrealizedLossPositionGrossLoss	0	usd
CY2021Q4	unm	Debt Securities Available For Sale Amortized Cost Net Of Allowance For Credit Losses DebtSecuritiesAvailableForSaleAmortizedCostNetOfAllowanceForCreditLosses	37386700000	usd
CY2021Q4	unm	Availableforsale Securities Debt Maturities Unrealized Gain Position Gross Gain AvailableforsaleSecuritiesDebtMaturitiesUnrealizedGainPositionGrossGain	6049400000	usd
CY2021Q4	unm	Available For Sale Securities Unrealized Loss Position Gross Loss Subtotal AvailableForSaleSecuritiesUnrealizedLossPositionGrossLossSubtotal	100100000	usd
	us-gaap	Affordable Housing Tax Credits And Other Tax Benefits Amount AffordableHousingTaxCreditsAndOtherTaxBenefitsAmount	15900000	usd
CY2022Q3	us-gaap	Amortization Method Qualified Affordable Housing Project Investments Amortization AmortizationMethodQualifiedAffordableHousingProjectInvestmentsAmortization	1400000	usd
CY2021Q3	us-gaap	Amortization Method Qualified Affordable Housing Project Investments Amortization AmortizationMethodQualifiedAffordableHousingProjectInvestmentsAmortization	4000000.0	usd
	us-gaap	Amortization Method Qualified Affordable Housing Project Investments Amortization AmortizationMethodQualifiedAffordableHousingProjectInvestmentsAmortization	4400000	usd
	us-gaap	Amortization Method Qualified Affordable Housing Project Investments Amortization AmortizationMethodQualifiedAffordableHousingProjectInvestmentsAmortization	11400000	usd
CY2022Q3	unm	Tax Benefitsfrom Low Income Housing Investments TaxBenefitsfromLowIncomeHousingInvestments	500000	usd
CY2021Q3	unm	Tax Benefitsfrom Low Income Housing Investments TaxBenefitsfromLowIncomeHousingInvestments	1100000	usd
CY2021Q4	us-gaap	Mortgage Loans On Real Estate Commercial And Consumer Net MortgageLoansOnRealEstateCommercialAndConsumerNet	2560400000	usd
CY2022Q3	us-gaap	Mortgage Loans On Real Estate Commercial And Consumer Net MortgageLoansOnRealEstateCommercialAndConsumerNet	2476400000	usd
CY2021Q4	us-gaap	Mortgage Loans On Real Estate Commercial And Consumer Net MortgageLoansOnRealEstateCommercialAndConsumerNet	2560400000	usd
CY2022Q3	us-gaap	Mortgage Loans On Real Estate Commercial And Consumer Net MortgageLoansOnRealEstateCommercialAndConsumerNet	2476400000	usd
CY2021Q4	us-gaap	Mortgage Loans On Real Estate Commercial And Consumer Net MortgageLoansOnRealEstateCommercialAndConsumerNet	2560400000	usd
CY2022Q3	us-gaap	Mortgage Loans On Real Estate Commercial And Consumer Net MortgageLoansOnRealEstateCommercialAndConsumerNet	2476400000	usd
CY2022Q3	us-gaap	Mortgage Loans On Real Estate Commercial And Consumer Net MortgageLoansOnRealEstateCommercialAndConsumerNet	2476400000	usd
CY2021Q4	us-gaap	Mortgage Loans On Real Estate Commercial And Consumer Net MortgageLoansOnRealEstateCommercialAndConsumerNet	2560400000	usd
	us-gaap	Gains Losses On Sales Of Other Real Estate GainsLossesOnSalesOfOtherRealEstate	0	usd
CY2022Q3	unm	Commitments To Fund Commercial Mortgage Loans CommitmentsToFundCommercialMortgageLoans	9000000	usd
	us-gaap	Repurchase Agreements Maturities RepurchaseAgreementsMaturities	30
CY2022Q3	unm	Collateral Requirements Minimum Percentage Collateral To Fair Value Of Securities Loaned Or Purchased Under Repurchase Agreements CollateralRequirementsMinimumPercentageCollateralToFairValueOfSecuritiesLoanedOrPurchasedUnderRepurchaseAgreements	1.02
CY2022Q3	unm	Collateral Requirements Minimum Percentage Collateral To Fair Value Of Securities Loaned Or Purchased Under Repurchase Agreements CollateralRequirementsMinimumPercentageCollateralToFairValueOfSecuritiesLoanedOrPurchasedUnderRepurchaseAgreements	1.02
CY2022Q3	us-gaap	Securities Loaned Gross SecuritiesLoanedGross	231000000	usd
CY2021Q4	us-gaap	Securities Loaned Gross SecuritiesLoanedGross	283700000	usd
CY2022Q3	us-gaap	Securities Sold Under Agreements To Repurchase SecuritiesSoldUnderAgreementsToRepurchase	0	usd
CY2021Q4	us-gaap	Securities Sold Under Agreements To Repurchase SecuritiesSoldUnderAgreementsToRepurchase	0	usd
CY2022Q3	us-gaap	Federal Home Loan Bank Stock FederalHomeLoanBankStock	17300000	usd
CY2021Q4	us-gaap	Federal Home Loan Bank Stock FederalHomeLoanBankStock	22100000	usd
CY2022Q3	us-gaap	Federal Home Loan Bank Advances Branch Of Fhlb Bank Amount Of Advances By Branch FederalHomeLoanBankAdvancesBranchOfFHLBBankAmountOfAdvancesByBranch	118500000	usd
CY2021Q4	us-gaap	Federal Home Loan Bank Advances Branch Of Fhlb Bank Amount Of Advances By Branch FederalHomeLoanBankAdvancesBranchOfFHLBBankAmountOfAdvancesByBranch	160900000	usd
CY2022Q3	us-gaap	Federal Home Loan Bank Advances General Debt Obligations Disclosures Collateral Pledged1 FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresCollateralPledged1	1355200000	usd
CY2021Q4	us-gaap	Federal Home Loan Bank Advances General Debt Obligations Disclosures Collateral Pledged1 FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresCollateralPledged1	1716100000	usd
CY2022Q3	us-gaap	Derivative Fair Value Of Derivative Asset DerivativeFairValueOfDerivativeAsset	128100000	usd
CY2022Q3	us-gaap	Derivative Asset Fair Value Gross Liability DerivativeAssetFairValueGrossLiability	0	usd
CY2022Q3	us-gaap	Derivative Assets DerivativeAssets	128100000	usd
CY2022Q3	us-gaap	Derivative Fair Value Of Derivative Asset Amount Offset Against Collateral DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral	1700000	usd
CY2022Q3	us-gaap	Securities Loaned Gross SecuritiesLoanedGross	231000000.0	usd
CY2022Q3	us-gaap	Securities Loaned Asset SecuritiesLoanedAsset	0	usd
CY2022Q3	us-gaap	Securities Loaned SecuritiesLoaned	231000000.0	usd
CY2022Q3	us-gaap	Securities Loaned Collateral Right To Reclaim Securities SecuritiesLoanedCollateralRightToReclaimSecurities	130900000	usd
CY2022Q3	us-gaap	Securities Loaned Amount Offset Against Collateral SecuritiesLoanedAmountOffsetAgainstCollateral	0	usd
CY2022Q3	us-gaap	Derivative Asset Securities Purchased Under Agreements To Resell Securities Borrowed Gross DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedGross	359100000	usd
CY2022Q3	us-gaap	Derivative Asset Securities Purchased Under Agreements To Resell Securities Borrowed Liability DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedLiability	0	usd
CY2022Q3	us-gaap	Derivative Asset Securities Purchased Under Agreements To Resell Securities Borrowed DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowed	359100000	usd
CY2022Q3	us-gaap	Derivative Asset Securities Purchased Under Agreements To Resell Securities Borrowed Collateral Obligation To Return Securities DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedCollateralObligationToReturnSecurities	176400000	usd
CY2022Q3	us-gaap	Derivative Asset Securities Purchased Under Agreements To Resell Securities Borrowed Collateral Obligation To Return Cash DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedCollateralObligationToReturnCash	181000000.0	usd
CY2022Q3	us-gaap	Derivative Asset Securities Purchased Under Agreements To Resell Securities Borrowed Amount Offset Against Collateral DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedAmountOffsetAgainstCollateral	1700000	usd
CY2022Q3	us-gaap	Securities Borrowed Gross SecuritiesBorrowedGross	100100000	usd
CY2022Q3	us-gaap	Securities Borrowed SecuritiesBorrowed	100100000	usd
CY2022Q3	us-gaap	Securities Borrowed Collateral Obligation To Return Securities SecuritiesBorrowedCollateralObligationToReturnSecurities	100100000	usd
CY2022Q3	us-gaap	Securities Borrowed Collateral Obligation To Return Cash SecuritiesBorrowedCollateralObligationToReturnCash	0	usd
CY2022Q3	us-gaap	Securities Borrowed Amount Offset Against Collateral SecuritiesBorrowedAmountOffsetAgainstCollateral	0	usd
CY2022Q3	us-gaap	Derivative Liability Securities Sold Under Agreements To Resell Securities Loaned Gross DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedGross	156500000	usd
CY2022Q3	us-gaap	Derivative Liability Securities Sold Under Agreements To Resell Securities Loaned DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoaned	156500000	usd
CY2022Q3	us-gaap	Derivative Liability Securities Sold Under Agreements To Resell Securities Loaned Collateral Right To Reclaim Securities DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedCollateralRightToReclaimSecurities	154700000	usd
CY2022Q3	us-gaap	Derivative Liability Securities Sold Under Agreements To Resell Securities Loaned Collateral Right To Reclaim Cash DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedCollateralRightToReclaimCash	0	usd
CY2022Q3	us-gaap	Derivative Liability Securities Sold Under Agreements To Resell Securities Loaned Amount Offset Against Collateral DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedAmountOffsetAgainstCollateral	1800000	usd
CY2021Q4	us-gaap	Derivative Fair Value Of Derivative Asset DerivativeFairValueOfDerivativeAsset	39500000	usd
CY2021Q4	us-gaap	Derivative Asset Fair Value Gross Liability DerivativeAssetFairValueGrossLiability	0	usd
CY2021Q4	us-gaap	Derivative Assets DerivativeAssets	39500000	usd
CY2021Q4	us-gaap	Derivative Collateral Obligation To Return Securities DerivativeCollateralObligationToReturnSecurities	9800000	usd
CY2021Q4	us-gaap	Derivative Collateral Obligation To Return Cash DerivativeCollateralObligationToReturnCash	28400000	usd
CY2021Q4	us-gaap	Securities Loaned Asset SecuritiesLoanedAsset	0	usd
CY2021Q4	us-gaap	Securities Loaned Collateral Right To Reclaim Securities SecuritiesLoanedCollateralRightToReclaimSecurities	188900000	usd
CY2021Q4	us-gaap	Securities Loaned Collateral Right To Reclaim Cash SecuritiesLoanedCollateralRightToReclaimCash	94800000	usd
CY2021Q4	us-gaap	Derivative Asset Securities Purchased Under Agreements To Resell Securities Borrowed Gross DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedGross	323200000	usd
CY2021Q4	us-gaap	Derivative Asset Securities Purchased Under Agreements To Resell Securities Borrowed Liability DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedLiability	0	usd
CY2021Q4	us-gaap	Derivative Asset Securities Purchased Under Agreements To Resell Securities Borrowed DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowed	323200000	usd
CY2021Q4	us-gaap	Derivative Asset Securities Purchased Under Agreements To Resell Securities Borrowed Amount Offset Against Collateral DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedAmountOffsetAgainstCollateral	1300000	usd
CY2021Q4	us-gaap	Securities Borrowed Amount Offset Against Collateral SecuritiesBorrowedAmountOffsetAgainstCollateral	0	usd
CY2021Q4	us-gaap	Derivative Liability Securities Sold Under Agreements To Resell Securities Loaned Gross DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedGross	129800000	usd
CY2021Q4	us-gaap	Derivative Liability Securities Sold Under Agreements To Resell Securities Loaned Asset DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedAsset	0	usd
CY2021Q4	us-gaap	Derivative Liability Securities Sold Under Agreements To Resell Securities Loaned DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoaned	129800000	usd
CY2021Q4	us-gaap	Derivative Liability Securities Sold Under Agreements To Resell Securities Loaned Collateral Right To Reclaim Securities DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedCollateralRightToReclaimSecurities	128800000	usd
CY2021Q4	us-gaap	Derivative Liability Securities Sold Under Agreements To Resell Securities Loaned Amount Offset Against Collateral DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedAmountOffsetAgainstCollateral	1000000.0	usd
CY2022Q3	us-gaap	Investment Income Interest And Dividend InvestmentIncomeInterestAndDividend	524600000	usd
CY2021Q3	us-gaap	Investment Income Interest And Dividend InvestmentIncomeInterestAndDividend	564300000	usd
	us-gaap	Investment Income Interest And Dividend InvestmentIncomeInterestAndDividend	1635800000	usd
	us-gaap	Investment Income Interest And Dividend InvestmentIncomeInterestAndDividend	1697900000	usd
CY2022Q3	us-gaap	Investment Income Investment Expense InvestmentIncomeInvestmentExpense	10000000.0	usd
	us-gaap	Investment Income Investment Expense InvestmentIncomeInvestmentExpense	26100000	usd
CY2022Q3	unm	Investment Income On Pfa Assets InvestmentIncomeOnPfaAssets	3000000.0	usd
CY2021Q3	unm	Investment Income On Pfa Assets InvestmentIncomeOnPfaAssets	3300000	usd
	unm	Investment Income On Pfa Assets InvestmentIncomeOnPfaAssets	8900000	usd
	unm	Investment Income On Pfa Assets InvestmentIncomeOnPfaAssets	9400000	usd
CY2022Q3	us-gaap	Net Investment Income NetInvestmentIncome	511600000	usd
CY2021Q3	us-gaap	Net Investment Income NetInvestmentIncome	550200000	usd
	us-gaap	Net Investment Income NetInvestmentIncome	1662400000	usd
CY2022Q3	us-gaap	Debt Securities Available For Sale Realized Gain DebtSecuritiesAvailableForSaleRealizedGain	0	usd
CY2021Q3	us-gaap	Debt Securities Available For Sale Realized Gain DebtSecuritiesAvailableForSaleRealizedGain	1300000	usd
	us-gaap	Debt Securities Available For Sale Realized Gain DebtSecuritiesAvailableForSaleRealizedGain	800000	usd
	us-gaap	Gain Loss From Hedged Firm Commitment Not Qualifying As Fair Value Hedge Net GainLossFromHedgedFirmCommitmentNotQualifyingAsFairValueHedgeNet	0	usd
	us-gaap	Debt Securities Available For Sale Realized Loss DebtSecuritiesAvailableForSaleRealizedLoss	26400000	usd
	us-gaap	Debt Securities Available For Sale Realized Loss DebtSecuritiesAvailableForSaleRealizedLoss	9000000.0	usd
CY2021Q3	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss Period Increase Decrease DebtSecuritiesAvailableForSaleAllowanceForCreditLossPeriodIncreaseDecrease	0	usd
	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss Period Increase Decrease DebtSecuritiesAvailableForSaleAllowanceForCreditLossPeriodIncreaseDecrease	4600000	usd
	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss Period Increase Decrease DebtSecuritiesAvailableForSaleAllowanceForCreditLossPeriodIncreaseDecrease	9300000	usd
CY2022Q3	unm	Other Investments Gross Realized Gains OtherInvestmentsGrossRealizedGains	0	usd
	us-gaap	Foreign Currency Transaction Gain Loss Before Tax ForeignCurrencyTransactionGainLossBeforeTax	-8500000	usd
	us-gaap	Foreign Currency Transaction Gain Loss Before Tax ForeignCurrencyTransactionGainLossBeforeTax	-1300000	usd
CY2022Q3	us-gaap	Gain Loss On Investments GainLossOnInvestments	-4400000	usd
CY2021Q3	us-gaap	Gain Loss On Investments GainLossOnInvestments	-100000	usd
	us-gaap	Gain Loss On Investments GainLossOnInvestments	-22300000	usd
	us-gaap	Gain Loss On Investments GainLossOnInvestments	85400000	usd
CY2022Q3	us-gaap	Derivative Liability Not Offset Policy Election Deduction DerivativeLiabilityNotOffsetPolicyElectionDeduction	26800000	usd
	us-gaap	Gain Loss From Hedged Firm Commitment Not Qualifying As Fair Value Hedge Net GainLossFromHedgedFirmCommitmentNotQualifyingAsFairValueHedgeNet	0	usd
CY2022Q3	us-gaap	Derivative Net Liability Position Aggregate Fair Value DerivativeNetLiabilityPositionAggregateFairValue	56400000	usd
CY2021Q4	us-gaap	Derivative Net Liability Position Aggregate Fair Value DerivativeNetLiabilityPositionAggregateFairValue	35000000	usd
	us-gaap	Interest Rate Cash Flow Hedge Gain Loss Reclassified To Earnings Net InterestRateCashFlowHedgeGainLossReclassifiedToEarningsNet	600000	usd
	us-gaap	Cash Flow Hedge Gain Loss To Be Reclassified Within Twelve Months CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths	39200000	usd
CY2022Q3	us-gaap	Gain Loss From Components Excluded From Assessment Of Fair Value Hedge Effectiveness Net GainLossFromComponentsExcludedFromAssessmentOfFairValueHedgeEffectivenessNet	200000	usd
	us-gaap	Gain Loss From Components Excluded From Assessment Of Fair Value Hedge Effectiveness Net GainLossFromComponentsExcludedFromAssessmentOfFairValueHedgeEffectivenessNet	13900000	usd
CY2021Q3	us-gaap	Gain Loss From Components Excluded From Assessment Of Fair Value Hedge Effectiveness Net GainLossFromComponentsExcludedFromAssessmentOfFairValueHedgeEffectivenessNet	400000	usd
CY2021Q3	us-gaap	Gain Loss From Hedged Firm Commitment Not Qualifying As Fair Value Hedge Net GainLossFromHedgedFirmCommitmentNotQualifyingAsFairValueHedgeNet	0	usd
CY2022Q3	us-gaap	Derivative Notional Amount DerivativeNotionalAmount	1672900000	usd
CY2021Q4	us-gaap	Derivative Notional Amount DerivativeNotionalAmount	970500000	usd
CY2021Q3	us-gaap	Interest And Debt Expense InterestAndDebtExpense	44700000	usd
	us-gaap	Net Investment Income NetInvestmentIncome	1597800000	usd
	us-gaap	Gain Loss On Investments GainLossOnInvestments	-22300000	usd
	us-gaap	Interest And Debt Expense InterestAndDebtExpense	141300000	usd
	us-gaap	Gain Loss On Investments GainLossOnInvestments	85400000	usd
	us-gaap	Interest And Debt Expense InterestAndDebtExpense	134400000	usd
CY2022Q2	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	-1772200000	usd
CY2022Q3	us-gaap	Other Comprehensive Income Loss Before Reclassifications Net Of Tax OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax	-1366800000	usd
CY2022Q3	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	-4300000	usd
CY2022Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-1362500000	usd
CY2021Q2	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	222100000	usd
CY2021Q3	us-gaap	Other Comprehensive Income Loss Before Reclassifications Net Of Tax OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax	-104500000	usd
CY2021Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-108200000	usd
CY2021Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	354100000	usd
	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	-1900000	usd
CY2022Q3	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	-3134700000	usd
	us-gaap	Other Comprehensive Income Loss Before Reclassifications Net Of Tax OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax	-297800000	usd
	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	-37500000	usd
	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-260300000	usd
CY2021Q3	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	113900000	usd
	us-gaap	Schedule Of Liability For Unpaid Claims And Claims Adjustment Expense ScheduleOfLiabilityForUnpaidClaimsAndClaimsAdjustmentExpense	<div><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Changes in the liability for unpaid claims and claim adjustment expenses are as follows: </span></div><div style="text-align:center"><table style="border-collapse:collapse;display:inline-table;margin-bottom:5pt;vertical-align:text-bottom;width:100.000%"><tr><td style="width:1.0%"/><td style="width:69.514%"/><td style="width:0.1%"/><td style="width:1.0%"/><td style="width:12.496%"/><td style="width:0.1%"/><td style="width:0.1%"/><td style="width:1.992%"/><td style="width:0.1%"/><td style="width:1.0%"/><td style="width:12.498%"/><td style="width:0.1%"/></tr><tr><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="padding:2px 1pt;text-align:center;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%">2022</span></td><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="border-bottom:1pt solid #000000;padding:2px 1pt;text-align:center;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%">2021</span></td></tr><tr><td colspan="3" style="padding:0 1pt"/><td colspan="9" style="border-top:1pt solid #000000;padding:2px 1pt;text-align:center;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%">(in millions of dollars)</span></td></tr><tr><td colspan="3" style="background-color:#cceeff;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:700;line-height:100%">Balance at January 1</span></td><td style="background-color:#cceeff;border-top:1pt solid #000000;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%">$</span></td><td style="background-color:#cceeff;border-top:1pt solid #000000;padding:2px 0;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%">23,664.7 </span></td><td style="background-color:#cceeff;border-top:1pt solid #000000;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/><td colspan="3" style="background-color:#cceeff;border-top:1pt solid #000000;padding:0 1pt"/><td style="background-color:#cceeff;border-top:1pt solid #000000;padding:2px 0 2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%">$</span></td><td style="background-color:#cceeff;border-top:1pt solid #000000;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%">24,180.2 </span></td><td style="background-color:#cceeff;border-top:1pt solid #000000;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/></tr><tr><td colspan="3" style="background-color:#ffffff;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%"> Less Reinsurance Recoverable</span></td><td colspan="2" style="background-color:#ffffff;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%">8,697.8 </span></td><td style="background-color:#ffffff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/><td colspan="3" style="background-color:#ffffff;padding:0 1pt"/><td colspan="2" style="background-color:#ffffff;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%">8,378.9 </span></td><td style="background-color:#ffffff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/></tr><tr><td colspan="3" style="background-color:#cceeff;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 Balance at January 1</span></td><td colspan="2" style="background-color:#cceeff;border-top:1pt solid #000000;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%">14,966.9 </span></td><td style="background-color:#cceeff;border-top:1pt solid #000000;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/><td colspan="2" style="background-color:#cceeff;border-top:1pt solid #000000;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%">15,801.3 </span></td><td style="background-color:#cceeff;border-top:1pt solid #000000;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/></tr><tr style="height:14pt"><td colspan="3" style="background-color:#ffffff;padding:0 1pt"/><td colspan="3" style="background-color:#ffffff;padding:0 1pt"/><td colspan="3" style="background-color:#ffffff;padding:0 1pt"/><td colspan="3" style="background-color:#ffffff;padding:0 1pt"/></tr><tr><td colspan="3" style="background-color:#cceeff;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%">Incurred Related to</span></td><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/></tr><tr><td colspan="3" style="background-color:#ffffff;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%"> Current Year</span></td><td colspan="2" style="background-color:#ffffff;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%">5,130.1 </span></td><td style="background-color:#ffffff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/><td colspan="3" style="background-color:#ffffff;padding:0 1pt"/><td colspan="2" style="background-color:#ffffff;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%">5,471.1 </span></td><td style="background-color:#ffffff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/></tr><tr><td colspan="3" style="background-color:#cceeff;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%"> Prior Years</span></td><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/></tr><tr><td colspan="3" style="background-color:#ffffff;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%"> Interest</span></td><td colspan="2" style="background-color:#ffffff;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%">460.5 </span></td><td style="background-color:#ffffff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/><td colspan="3" style="background-color:#ffffff;padding:0 1pt"/><td colspan="2" style="background-color:#ffffff;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%">525.3 </span></td><td style="background-color:#ffffff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/></tr><tr><td colspan="3" style="background-color:#cceeff;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%"> All Other Incurred</span></td><td colspan="2" style="background-color:#cceeff;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%">(601.4)</span></td><td style="background-color:#cceeff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/><td colspan="2" style="background-color:#cceeff;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%">(613.3)</span></td><td style="background-color:#cceeff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/></tr><tr><td colspan="3" style="background-color:#ffffff;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</span></td><td colspan="2" style="background-color:#ffffff;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%">(388.3)</span></td><td style="background-color:#ffffff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/><td colspan="3" style="background-color:#ffffff;padding:0 1pt"/><td colspan="2" style="background-color:#ffffff;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%">(32.6)</span></td><td style="background-color:#ffffff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/></tr><tr><td colspan="3" style="background-color:#cceeff;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%">Total Incurred</span></td><td colspan="2" style="background-color:#cceeff;border-top:1pt solid #000000;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%">4,600.9 </span></td><td style="background-color:#cceeff;border-top:1pt solid #000000;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/><td colspan="2" style="background-color:#cceeff;border-top:1pt solid #000000;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%">5,350.5 </span></td><td style="background-color:#cceeff;border-top:1pt solid #000000;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/></tr><tr style="height:14pt"><td colspan="3" style="background-color:#ffffff;padding:0 1pt"/><td colspan="3" style="background-color:#ffffff;border-top:1pt solid #000000;padding:0 1pt"/><td colspan="3" style="background-color:#ffffff;padding:0 1pt"/><td colspan="3" style="background-color:#ffffff;border-top:1pt solid #000000;padding:0 1pt"/></tr><tr><td colspan="3" style="background-color:#cceeff;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%">Paid Related to</span></td><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/></tr><tr><td colspan="3" style="background-color:#ffffff;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%"> Current Year</span></td><td colspan="2" style="background-color:#ffffff;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%">(2,118.6)</span></td><td style="background-color:#ffffff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/><td colspan="3" style="background-color:#ffffff;padding:0 1pt"/><td colspan="2" style="background-color:#ffffff;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%">(2,225.3)</span></td><td style="background-color:#ffffff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/></tr><tr><td colspan="3" style="background-color:#cceeff;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%"> Prior Years</span></td><td colspan="2" style="background-color:#cceeff;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%">(3,051.2)</span></td><td style="background-color:#cceeff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/><td colspan="2" style="background-color:#cceeff;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%">(3,021.8)</span></td><td style="background-color:#cceeff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/></tr><tr><td colspan="3" style="background-color:#ffffff;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%">Total Paid</span></td><td colspan="2" style="background-color:#ffffff;border-top:1pt solid #000000;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%">(5,169.8)</span></td><td style="background-color:#ffffff;border-top:1pt solid #000000;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/><td colspan="3" style="background-color:#ffffff;padding:0 1pt"/><td colspan="2" style="background-color:#ffffff;border-top:1pt solid #000000;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%">(5,247.1)</span></td><td style="background-color:#ffffff;border-top:1pt solid #000000;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/></tr><tr style="height:14pt"><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/><td colspan="3" style="background-color:#cceeff;border-top:1pt solid #000000;padding:0 1pt"/><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/><td colspan="3" style="background-color:#cceeff;border-top:1pt solid #000000;padding:0 1pt"/></tr><tr><td colspan="3" style="background-color:#ffffff;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%">Reserves Ceded Pursuant to Reinsurance Transaction</span></td><td colspan="2" style="background-color:#ffffff;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%">— </span></td><td style="background-color:#ffffff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/><td colspan="3" style="background-color:#ffffff;padding:0 1pt"/><td colspan="2" style="background-color:#ffffff;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%">(990.0)</span></td><td style="background-color:#ffffff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/></tr><tr style="height:14pt"><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/></tr><tr><td colspan="3" style="background-color:#ffffff;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%">Net Balance at September 30</span></div></td><td colspan="2" style="background-color:#ffffff;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%">14,398.0 </span></td><td style="background-color:#ffffff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/><td colspan="3" style="background-color:#ffffff;padding:0 1pt"/><td colspan="2" style="background-color:#ffffff;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%">14,914.7 </span></td><td style="background-color:#ffffff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/></tr><tr><td colspan="3" style="background-color:#cceeff;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%"> Plus Reinsurance Recoverable</span></td><td colspan="2" style="background-color:#cceeff;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%">8,401.4 </span></td><td style="background-color:#cceeff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/><td colspan="2" style="background-color:#cceeff;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%">8,854.8 </span></td><td style="background-color:#cceeff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/></tr><tr><td colspan="3" style="background-color:#ffffff;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:700;line-height:100%">Balance at September 30</span></div></td><td style="background-color:#ffffff;border-bottom:3pt double #000000;border-top:1pt solid #000000;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%">$</span></td><td style="background-color:#ffffff;border-bottom:3pt double #000000;border-top:1pt solid #000000;padding:2px 0;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%">22,799.4 </span></td><td style="background-color:#ffffff;border-bottom:3pt double #000000;border-top:1pt solid #000000;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/><td colspan="3" style="background-color:#ffffff;padding:0 1pt"/><td style="background-color:#ffffff;border-bottom:3pt double #000000;border-top:1pt solid #000000;padding:2px 0 2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%">$</span></td><td style="background-color:#ffffff;border-bottom:3pt double #000000;border-top:1pt solid #000000;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%">23,769.5 </span></td><td style="background-color:#ffffff;border-bottom:3pt double #000000;border-top:1pt solid #000000;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/></tr></table></div>
CY2020Q4	us-gaap	Liability For Claims And Claims Adjustment Expense LiabilityForClaimsAndClaimsAdjustmentExpense	24180200000	usd
CY2021Q4	us-gaap	Reinsurance Receivables Incurred But Not Reported Claims ReinsuranceReceivablesIncurredButNotReportedClaims	8697800000	usd
CY2020Q4	us-gaap	Reinsurance Receivables Incurred But Not Reported Claims ReinsuranceReceivablesIncurredButNotReportedClaims	8378900000	usd
	us-gaap	Payments For Losses And Loss Adjustment Expense PaymentsForLossesAndLossAdjustmentExpense	5247100000	usd
	unm	Reserves Ceded Pursuant To Reinsurance Transaction ReservesCededPursuantToReinsuranceTransaction	990000000.0	usd
CY2022Q3	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Net LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet	14398000000	usd
CY2022Q3	us-gaap	Reinsurance Receivables Incurred But Not Reported Claims ReinsuranceReceivablesIncurredButNotReportedClaims	8401400000	usd
CY2022Q3	us-gaap	Liability For Claims And Claims Adjustment Expense LiabilityForClaimsAndClaimsAdjustmentExpense	22799400000	usd
CY2021Q3	us-gaap	Liability For Claims And Claims Adjustment Expense LiabilityForClaimsAndClaimsAdjustmentExpense	23769500000	usd
CY2022Q3	unm	Policy And Contract Benefits PolicyAndContractBenefits	1771400000	usd
CY2021Q3	unm	Policy And Contract Benefits PolicyAndContractBenefits	1920400000	usd
CY2022Q3	us-gaap	Liability For Future Policy Benefits And Unpaid Claims And Claims Adjustment Expense LiabilityForFuturePolicyBenefitsAndUnpaidClaimsAndClaimsAdjustmentExpense	42108700000	usd
CY2021Q3	us-gaap	Liability For Future Policy Benefits And Unpaid Claims And Claims Adjustment Expense LiabilityForFuturePolicyBenefitsAndUnpaidClaimsAndClaimsAdjustmentExpense	48475700000	usd
CY2021Q3	us-gaap	Liability For Future Policy Benefits LiabilityForFuturePolicyBenefits	50396100000	usd
CY2022Q3	unm	Life Reserves For Future Policy And Contract Benefits LifeReservesForFuturePolicyAndContractBenefits	8489800000	usd
CY2021Q3	unm	Life Reserves For Future Policy And Contract Benefits LifeReservesForFuturePolicyAndContractBenefits	8465800000	usd
CY2022Q3	unm	Unrealized Adjustment To Reserves For Future Policy And Contract Benefits UnrealizedAdjustmentToReservesForFuturePolicyAndContractBenefits	-764300000	usd
CY2021Q3	unm	Unrealized Adjustment To Reserves For Future Policy And Contract Benefits UnrealizedAdjustmentToReservesForFuturePolicyAndContractBenefits	5143900000	usd
CY2022Q3	us-gaap	Liability For Claims And Claims Adjustment Expense LiabilityForClaimsAndClaimsAdjustmentExpense	22799400000	usd
CY2021Q3	us-gaap	Liability For Claims And Claims Adjustment Expense LiabilityForClaimsAndClaimsAdjustmentExpense	23769500000	usd
	us-gaap	Number Of Operating Segments NumberOfOperatingSegments	3	integer
CY2022Q3	us-gaap	Premiums Earned Net PremiumsEarnedNet	2391700000	usd
	us-gaap	Premiums Earned Net PremiumsEarnedNet	7212300000	usd
CY2022Q3	us-gaap	Assets Assets	60866700000	usd
CY2021Q4	us-gaap	Assets Assets	70115600000	usd
CY2021Q3	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	496500	shares
	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	1256700	shares
CY2021Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	204645800	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	201262300	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	204429600	shares
CY2022Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	201650200	shares
CY2021Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	205142300	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	202519000	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	205052900	shares
CY2021Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.61
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	5.14
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.25
CY2021Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.60
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	5.11
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	3.24
CY2022Q3	unm	Outstanding Restricted Stock And Stock Success Unit Grant Prices Lower Limit OutstandingRestrictedStockAndStockSuccessUnitGrantPricesLowerLimit	12.45
CY2022Q3	unm	Outstanding Restricted Stock And Stock Success Unit Grant Prices Upper Limit OutstandingRestrictedStockAndStockSuccessUnitGrantPricesUpperLimit	39.82
CY2021Q3	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	1300000	shares
	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	1100000	shares
CY2021Q4	us-gaap	Stock Repurchase Program Authorized Amount1 StockRepurchaseProgramAuthorizedAmount1	250000000	usd
	us-gaap	Stock Repurchase Program Expiration Date StockRepurchaseProgramExpirationDate	2022-12-31
	us-gaap	Treasury Stock Shares Acquired TreasuryStockSharesAcquired	4243400	shares
	us-gaap	Treasury Stock Shares Acquired TreasuryStockSharesAcquired	0	shares
CY2022Q3	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	42600000	usd
CY2021Q3	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	0	usd
	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	137500000	usd
CY2022Q3	us-gaap	Stock Repurchase Program Remaining Authorized Repurchase Amount1 StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1	62500000	usd
CY2022Q3	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	25000000.0	shares
CY2022Q3	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0.10
CY2022Q3	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	0	shares
	us-gaap	Income Tax Expense Benefit Continuing Operations Adjustment Of Deferred Tax Asset Liability IncomeTaxExpenseBenefitContinuingOperationsAdjustmentOfDeferredTaxAssetLiability	24200000	usd
CY2021Q4	us-gaap	Premiums Receivable Gross PremiumsReceivableGross	530700000	usd
CY2022Q3	us-gaap	Premium Receivable Credit Loss Expense Reversal PremiumReceivableCreditLossExpenseReversal	-2900000	usd
CY2020Q4	us-gaap	Premiums Receivable Allowance For Doubtful Accounts PremiumsReceivableAllowanceForDoubtfulAccounts	38800000	usd
CY2020Q4	us-gaap	Premiums Receivable Gross PremiumsReceivableGross	525800000	usd
	us-gaap	Premium Receivable Credit Loss Expense Reversal PremiumReceivableCreditLossExpenseReversal	-6200000	usd
	dei	Entity Central Index Key EntityCentralIndexKey	0000005513
CY2022Q3	us-gaap	Real Estate Heldforsale RealEstateHeldforsale	44300000	usd
CY2021Q4	us-gaap	Real Estate Heldforsale RealEstateHeldforsale	45000000.0	usd
	dei	Document Period End Date DocumentPeriodEndDate	2022-09-30
	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	DE
	dei	Entity Address City Or Town EntityAddressCityOrTown	Chattanooga,
	dei	Entity Address State Or Province EntityAddressStateOrProvince	TN
	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
	dei	Entity Small Business EntitySmallBusiness	false
	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
CY2022Q3	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	37721400000	usd
CY2021Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	43336000000	usd
CY2021Q4	us-gaap	Other Long Term Investments OtherLongTermInvestments	1203000000	usd
CY2022Q3	us-gaap	Other Short Term Investments OtherShortTermInvestments	1183200000	usd
CY2021Q4	us-gaap	Other Short Term Investments OtherShortTermInvestments	1388000000	usd
CY2022Q3	us-gaap	Cash Cash	143300000	usd
CY2021Q4	us-gaap	Cash Cash	75000000.0	usd
	us-gaap	Gain Loss On Investments GainLossOnInvestments	-22300000	usd
CY2022Q3	us-gaap	Premiums Receivable Allowance For Doubtful Accounts PremiumsReceivableAllowanceForDoubtfulAccounts	31400000	usd
CY2021Q4	us-gaap	Premiums Receivable Allowance For Doubtful Accounts PremiumsReceivableAllowanceForDoubtfulAccounts	34200000	usd
CY2022Q3	us-gaap	Premiums And Other Receivables Net PremiumsAndOtherReceivablesNet	1475400000	usd
CY2021Q4	us-gaap	Reinsurance Recoverables ReinsuranceRecoverables	10919300000	usd
CY2022Q3	us-gaap	Accrued Investment Income Receivable AccruedInvestmentIncomeReceivable	717200000	usd
CY2021Q4	us-gaap	Accrued Investment Income Receivable AccruedInvestmentIncomeReceivable	602700000	usd
CY2022Q3	us-gaap	Deferred Income Tax Assets Net DeferredIncomeTaxAssetsNet	523100000	usd
CY2021Q4	us-gaap	Assets Assets	70115600000	usd
CY2021Q4	us-gaap	Liability For Future Policy Benefits And Unpaid Claims And Claims Adjustment Expense LiabilityForFuturePolicyBenefitsAndUnpaidClaimsAndClaimsAdjustmentExpense	48007500000	usd
CY2022Q3	us-gaap	Unearned Premiums UnearnedPremiums	394000000.0	usd
CY2022Q3	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	6500000	usd
CY2021Q4	us-gaap	Long Term Debt And Capital Lease Obligations LongTermDebtAndCapitalLeaseObligations	3442200000	usd
CY2022Q3	us-gaap	Other Liabilities OtherLiabilities	2529200000	usd
CY2021Q4	us-gaap	Other Liabilities OtherLiabilities	2585900000	usd
CY2022Q3	us-gaap	Liabilities Liabilities	52207200000	usd
CY2021Q4	us-gaap	Liabilities Liabilities	58699200000	usd
CY2022Q3	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		usd
CY2021Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		usd
CY2022Q3	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.10
CY2021Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.10
CY2022Q3	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	725000000	shares
CY2021Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	725000000	shares
CY2022Q3	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	308189371	shares
CY2021Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	307334853	shares
CY2022Q3	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	12698300000	usd
CY2021Q4	us-gaap	Treasury Stock Shares TreasuryStockShares	104820670	shares
CY2022Q3	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	60866700000	usd
CY2021Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	70115600000	usd
CY2021Q3	us-gaap	Net Investment Income NetInvestmentIncome	550200000	usd
	us-gaap	Net Investment Income NetInvestmentIncome	1597800000	usd
CY2022Q3	us-gaap	Gain Loss On Investments GainLossOnInvestments	-4400000	usd
CY2022Q3	us-gaap	Revenues Revenues	2961900000	usd
CY2022Q3	us-gaap	Insurance Commissions InsuranceCommissions	271500000	usd
CY2022Q3	us-gaap	Interest And Debt Expense InterestAndDebtExpense	47000000.0	usd
CY2021Q3	us-gaap	Interest And Debt Expense InterestAndDebtExpense	44700000	usd
	us-gaap	Interest And Debt Expense InterestAndDebtExpense	141300000	usd
	us-gaap	Interest And Debt Expense InterestAndDebtExpense	134400000	usd
CY2022Q3	unm	Cost Related To Early Retirement Of Debt CostRelatedToEarlyRetirementOfDebt	4200000	usd
CY2022Q3	us-gaap	Deferred Policy Acquisition Cost Amortization Expense DeferredPolicyAcquisitionCostAmortizationExpense	150800000	usd
CY2022Q3	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	247300000	usd
	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	744400000	usd
	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	746800000	usd
CY2022Q3	us-gaap	Benefits Losses And Expenses BenefitsLossesAndExpenses	2446600000	usd
CY2021Q3	us-gaap	Benefits Losses And Expenses BenefitsLossesAndExpenses	2559800000	usd
	us-gaap	Benefits Losses And Expenses BenefitsLossesAndExpenses	7714800000	usd
	us-gaap	Benefits Losses And Expenses BenefitsLossesAndExpenses	8163400000	usd
CY2022Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	515300000	usd
CY2021Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	409900000	usd
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	1270500000	usd
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	871300000	usd
CY2022Q3	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	156900000	usd
CY2021Q3	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	46500000	usd
	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	383800000	usd
	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	164400000	usd
CY2022Q3	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-52300000	usd
	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-147900000	usd
CY2021Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	81300000	usd
CY2022Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.04
CY2022Q3	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax	-520800000	usd
CY2022Q3	unm	Change In Adjustment To Deferred Acquisition Costs And Reserves For Future Policy And Contract Benefits Net Of Reinsurance Tax Expense ChangeInAdjustmentToDeferredAcquisitionCostsAndReservesForFuturePolicyAndContractBenefitsNetOfReinsuranceTaxExpense	184300000	usd
	unm	Change In Adjustment To Deferred Acquisition Costs And Reserves For Future Policy And Contract Benefits Net Of Reinsurance And Net Of Tax Expense Benefit ChangeInAdjustmentToDeferredAcquisitionCostsAndReservesForFuturePolicyAndContractBenefitsNetOfReinsuranceAndNetOfTaxExpenseBenefit	4209200000	usd
CY2022Q3	unm	Other Comprehensive Income Loss Net Gain On Hedges Adjustment Tax OtherComprehensiveIncomeLossNetGainOnHedgesAdjustmentTax	-8100000	usd
CY2021Q3	unm	Other Comprehensive Income Loss Net Gain On Hedges Adjustment Tax OtherComprehensiveIncomeLossNetGainOnHedgesAdjustmentTax	-2200000	usd
CY2022Q3	us-gaap	Other Comprehensive Income Loss Foreign Currency Translation Adjustment Tax OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax	5400000	usd
CY2022Q3	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	1100000	usd
	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-13600000	usd
CY2022Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-1362500000	usd
	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-3488800000	usd
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	404200000	usd
CY2021Q3	us-gaap	Stockholders Equity StockholdersEquity	11118200000	usd
	us-gaap	Increase Decrease In Insurance Liabilities IncreaseDecreaseInInsuranceLiabilities	-125500000	usd
	us-gaap	Increase Decrease In Insurance Liabilities IncreaseDecreaseInInsuranceLiabilities	131800000	usd
	us-gaap	Increase Decrease In Accrued Income Taxes Payable IncreaseDecreaseInAccruedIncomeTaxesPayable	-21600000	usd
	us-gaap	Increase Decrease In Accrued Income Taxes Payable IncreaseDecreaseInAccruedIncomeTaxesPayable	205000000.0	usd
	us-gaap	Increase Decrease In Other Accrued Liabilities IncreaseDecreaseInOtherAccruedLiabilities	-135000000.0	usd
	us-gaap	Increase Decrease In Other Accrued Liabilities IncreaseDecreaseInOtherAccruedLiabilities	-64200000	usd
	us-gaap	Increase Decrease In Accrued Investment Income Receivable IncreaseDecreaseInAccruedInvestmentIncomeReceivable	293000000.0	usd
	us-gaap	Increase Decrease In Accrued Investment Income Receivable IncreaseDecreaseInAccruedInvestmentIncomeReceivable	175800000	usd
	us-gaap	Gain Loss On Investments GainLossOnInvestments	-22300000	usd
	us-gaap	Gain Loss On Investments GainLossOnInvestments	85400000	usd
	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	83500000	usd
	us-gaap	Increase Decrease In Prepaid Reinsurance Premiums IncreaseDecreaseInPrepaidReinsurancePremiums	-59400000	usd
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	907400000	usd
	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	453400000	usd
	us-gaap	Proceeds From Sale And Maturity Of Other Investments ProceedsFromSaleAndMaturityOfOtherInvestments	273800000	usd
	us-gaap	Payments To Acquire Other Investments PaymentsToAcquireOtherInvestments	342700000	usd
	us-gaap	Payments To Acquire Other Investments PaymentsToAcquireOtherInvestments	389300000	usd
	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	0	usd
	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	400000	usd
	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	500000000.0	usd
	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	2300000	usd
	unm	Cash Received Related To Active Life Volatility Cover Agreement Reinsurance Agreement CashReceivedRelatedToActiveLifeVolatilityCoverAgreementReinsuranceAgreement	40400000	usd
	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-1700000	usd
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-302300000	usd
	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	68300000	usd
CY2021Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	75000000.0	usd
	us-gaap	Basis Of Accounting BasisOfAccounting	<div><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">The accompanying consolidated financial statements of Unum Group and its subsidiaries (the Company) have been prepared in accordance with U.S. generally accepted accounting principles (GAAP) for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by GAAP for complete financial statements. For further information, refer to the consolidated financial statements and footnotes included in our annual report on Form 10-K for the year ended December 31, 2021.</span></div><div><span><br/></span></div><div><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">In 2021, we changed the presentation of policyholder account deposits and withdrawals related to our universal life products to present the activity on a gross basis within the financing activities section of the Consolidated Statements of Cash Flows. As a result of this change, we determined that certain historical adjustments related to the cost of insurance, policy administration expenses and surrender charges for these products were incorrectly presented as a component of net cash used by financing activities rather than as a component of net cash provided by operating activities. We determined that the impact of the error to the previously issued Consolidated Statements of Cash Flows was not material and we have corrected the error. The impact of this correction for the nine months ended September 30, 2021 was a decrease to the change in insurance reserves and liabilities within net cash used by operating activities of $91.9 million, with a corresponding decrease to net cash used by financing activities. Within net cash used by financing activities, the other, net line item was adjusted as a result of the error correction to separately present proceeds from policyholder account deposits and payments for policyholder account withdrawals. The error had no impact on our financial position or our results of operations.</span></div><div><span><br/></span></div><div><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">In our opinion, all adjustments (consisting of normal recurring accruals) considered necessary for a fair presentation have been included. Interim results are not necessarily indicative of full year performance, particularly when considering the risks and uncertainties associated with the coronavirus disease 2019 (COVID-19) and the impacts it may have on our financial position, results of operations, liquidity and capital resources, and overall business operations.</span></div>
CY2022Q3	us-gaap	Derivative Assets DerivativeAssets	128100000	usd
CY2022Q3	us-gaap	Equity Securities Fv Ni EquitySecuritiesFvNi	40200000	usd
CY2022Q3	unm	Debt Securities Available For Sale Amortized Cost Maturity Allocated And Single Maturity Date Year One Net DebtSecuritiesAvailableForSaleAmortizedCostMaturityAllocatedAndSingleMaturityDateYearOneNet	1155400000	usd
CY2022Q3	unm	Debt Securities Available For Sale Amortized Cost Maturity Allocated And Single Maturity Date After Year5 Through10 Net DebtSecuritiesAvailableForSaleAmortizedCostMaturityAllocatedAndSingleMaturityDateAfterYear5Through10Net	10456200000	usd
CY2022Q3	unm	Debt Securities Available For Sale Maturity Without Single Maturity Date Amortized Cost Net DebtSecuritiesAvailableForSaleMaturityWithoutSingleMaturityDateAmortizedCostNet	555000000.0	usd
CY2022Q3	unm	Available For Sale Securities Debt Maturities Without Single Maturity Date Unrealized Gain Position Gross Gain AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateUnrealizedGainPositionGrossGain	7400000	usd
CY2021Q4	unm	Available For Sale Securities Debt Maturities Within One Year Unrealized Gain Position Gross Gain AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearUnrealizedGainPositionGrossGain	17600000	usd
CY2021Q4	unm	Available For Sale Securities Debt Maturities After Ten Years Unrealized Gain Position Gross Gain AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsUnrealizedGainPositionGrossGain	3987900000	usd
CY2021Q4	unm	Available For Sale Securities Debt Maturities After Ten Years Unrealized Loss Position Gross Loss AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsUnrealizedLossPositionGrossLoss	68000000.0	usd
CY2022Q3	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	34148200000	usd
CY2022Q3	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	638500000	usd
CY2022Q3	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	4207100000	usd
CY2022Q3	unm	Fixed Maturity Securities In Unrealized Loss Position Percent Of Total FixedMaturitySecuritiesInUnrealizedLossPositionPercentOfTotal	1.000
CY2022Q3	us-gaap	Affordable Housing Tax Credits And Other Tax Benefits Amount AffordableHousingTaxCreditsAndOtherTaxBenefitsAmount	1900000	usd
CY2021Q3	us-gaap	Affordable Housing Tax Credits And Other Tax Benefits Amount AffordableHousingTaxCreditsAndOtherTaxBenefitsAmount	5100000	usd
	us-gaap	Affordable Housing Tax Credits And Other Tax Benefits Amount AffordableHousingTaxCreditsAndOtherTaxBenefitsAmount	6000000.0	usd
	unm	Tax Benefitsfrom Low Income Housing Investments TaxBenefitsfromLowIncomeHousingInvestments	1600000	usd
	unm	Tax Benefitsfrom Low Income Housing Investments TaxBenefitsfromLowIncomeHousingInvestments	4500000	usd
CY2022Q3	us-gaap	Mortgage Loans On Real Estate Commercial And Consumer Net MortgageLoansOnRealEstateCommercialAndConsumerNet	2476400000	usd
CY2021Q4	us-gaap	Mortgage Loans On Real Estate Commercial And Consumer Net MortgageLoansOnRealEstateCommercialAndConsumerNet	2560400000	usd
CY2022Q3	us-gaap	Mortgage Loans On Real Estate Commercial And Consumer Net MortgageLoansOnRealEstateCommercialAndConsumerNet	2476400000	usd
CY2021Q4	us-gaap	Mortgage Loans On Real Estate Commercial And Consumer Net MortgageLoansOnRealEstateCommercialAndConsumerNet	2560400000	usd
CY2022Q3	us-gaap	Gains Losses On Sales Of Other Real Estate GainsLossesOnSalesOfOtherRealEstate	0	usd
	us-gaap	Gains Losses On Sales Of Other Real Estate GainsLossesOnSalesOfOtherRealEstate	0	usd
CY2022Q3	us-gaap	Derivative Collateral Obligation To Return Securities DerivativeCollateralObligationToReturnSecurities	45500000	usd
CY2022Q3	us-gaap	Derivative Collateral Obligation To Return Cash DerivativeCollateralObligationToReturnCash	80900000	usd
CY2022Q3	us-gaap	Securities Loaned Collateral Right To Reclaim Cash SecuritiesLoanedCollateralRightToReclaimCash	100100000	usd
CY2022Q3	us-gaap	Securities Borrowed Liability SecuritiesBorrowedLiability	0	usd
CY2022Q3	us-gaap	Derivative Liability Securities Sold Under Agreements To Resell Securities Loaned Asset DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedAsset	0	usd
CY2021Q4	us-gaap	Derivative Fair Value Of Derivative Asset Amount Offset Against Collateral DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral	1300000	usd
CY2021Q4	us-gaap	Securities Loaned Gross SecuritiesLoanedGross	283700000	usd
CY2021Q4	us-gaap	Securities Loaned SecuritiesLoaned	283700000	usd
CY2021Q4	us-gaap	Securities Loaned Amount Offset Against Collateral SecuritiesLoanedAmountOffsetAgainstCollateral	0	usd
CY2021Q4	us-gaap	Derivative Asset Securities Purchased Under Agreements To Resell Securities Borrowed Collateral Obligation To Return Securities DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedCollateralObligationToReturnSecurities	198700000	usd
CY2021Q4	us-gaap	Derivative Asset Securities Purchased Under Agreements To Resell Securities Borrowed Collateral Obligation To Return Cash DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedCollateralObligationToReturnCash	123200000	usd
CY2021Q4	us-gaap	Securities Borrowed Gross SecuritiesBorrowedGross	94800000	usd
CY2021Q4	us-gaap	Securities Borrowed Liability SecuritiesBorrowedLiability	0	usd
CY2021Q4	us-gaap	Securities Borrowed SecuritiesBorrowed	94800000	usd
CY2021Q4	us-gaap	Securities Borrowed Collateral Obligation To Return Securities SecuritiesBorrowedCollateralObligationToReturnSecurities	94800000	usd
CY2021Q4	us-gaap	Securities Borrowed Collateral Obligation To Return Cash SecuritiesBorrowedCollateralObligationToReturnCash	0	usd
CY2021Q4	us-gaap	Derivative Liability Securities Sold Under Agreements To Resell Securities Loaned Collateral Right To Reclaim Cash DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedCollateralRightToReclaimCash	0	usd
CY2021Q3	us-gaap	Investment Income Investment Expense InvestmentIncomeInvestmentExpense	10800000	usd
	us-gaap	Investment Income Investment Expense InvestmentIncomeInvestmentExpense	29100000	usd
	us-gaap	Net Investment Income NetInvestmentIncome	1597800000	usd
	us-gaap	Debt Securities Available For Sale Realized Gain DebtSecuritiesAvailableForSaleRealizedGain	74900000	usd
CY2022Q3	us-gaap	Debt Securities Available For Sale Realized Loss DebtSecuritiesAvailableForSaleRealizedLoss	13400000	usd
CY2021Q3	us-gaap	Debt Securities Available For Sale Realized Loss DebtSecuritiesAvailableForSaleRealizedLoss	5400000	usd
CY2022Q3	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss Period Increase Decrease DebtSecuritiesAvailableForSaleAllowanceForCreditLossPeriodIncreaseDecrease	500000	usd
CY2021Q3	unm	Other Investments Gross Realized Gains OtherInvestmentsGrossRealizedGains	1500000	usd
	unm	Other Investments Gross Realized Gains OtherInvestmentsGrossRealizedGains	1400000	usd
	unm	Other Investments Gross Realized Gains OtherInvestmentsGrossRealizedGains	5000000.0	usd
CY2022Q3	us-gaap	Financing Receivable Allowance For Credit Losses Period Increase Decrease FinancingReceivableAllowanceForCreditLossesPeriodIncreaseDecrease	400000	usd
CY2021Q3	us-gaap	Financing Receivable Allowance For Credit Losses Period Increase Decrease FinancingReceivableAllowanceForCreditLossesPeriodIncreaseDecrease	0	usd
	us-gaap	Financing Receivable Allowance For Credit Losses Period Increase Decrease FinancingReceivableAllowanceForCreditLossesPeriodIncreaseDecrease	300000	usd
	us-gaap	Financing Receivable Allowance For Credit Losses Period Increase Decrease FinancingReceivableAllowanceForCreditLossesPeriodIncreaseDecrease	-1600000	usd
CY2022Q3	us-gaap	Embedded Derivative Gain Loss On Embedded Derivative Net EmbeddedDerivativeGainLossOnEmbeddedDerivativeNet	14900000	usd
CY2021Q3	us-gaap	Embedded Derivative Gain Loss On Embedded Derivative Net EmbeddedDerivativeGainLossOnEmbeddedDerivativeNet	2600000	usd
	us-gaap	Embedded Derivative Gain Loss On Embedded Derivative Net EmbeddedDerivativeGainLossOnEmbeddedDerivativeNet	10700000	usd
	us-gaap	Embedded Derivative Gain Loss On Embedded Derivative Net EmbeddedDerivativeGainLossOnEmbeddedDerivativeNet	21200000	usd
CY2022Q3	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	-900000	usd
CY2021Q3	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	700000	usd
	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	4600000	usd
	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	2300000	usd
CY2022Q3	us-gaap	Foreign Currency Transaction Gain Loss Before Tax ForeignCurrencyTransactionGainLossBeforeTax	-4100000	usd
CY2021Q3	us-gaap	Foreign Currency Transaction Gain Loss Before Tax ForeignCurrencyTransactionGainLossBeforeTax	-800000	usd
CY2022Q3	us-gaap	Derivative Asset Not Offset Policy Election Deduction DerivativeAssetNotOffsetPolicyElectionDeduction	95400000	usd
CY2021Q4	us-gaap	Derivative Asset Not Offset Policy Election Deduction DerivativeAssetNotOffsetPolicyElectionDeduction	32000000.0	usd
CY2021Q4	us-gaap	Derivative Liability Not Offset Policy Election Deduction DerivativeLiabilityNotOffsetPolicyElectionDeduction	27600000	usd
	us-gaap	Supplemental Information For Property Casualty Insurance Underwriters Current Year Claims And Claims Adjustment Expense SupplementalInformationForPropertyCasualtyInsuranceUnderwritersCurrentYearClaimsAndClaimsAdjustmentExpense	5471100000	usd
	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Claims Paid Prior Years1 LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidPriorYears1	3051200000	usd
	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Claims Paid Prior Years1 LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidPriorYears1	3021800000	usd
	us-gaap	Gain Loss From Components Excluded From Assessment Of Fair Value Hedge Effectiveness Net GainLossFromComponentsExcludedFromAssessmentOfFairValueHedgeEffectivenessNet	10600000	usd
CY2022Q3	us-gaap	Gain Loss From Hedged Firm Commitment Not Qualifying As Fair Value Hedge Net GainLossFromHedgedFirmCommitmentNotQualifyingAsFairValueHedgeNet	0	usd
CY2022Q3	us-gaap	Net Investment Income NetInvestmentIncome	511600000	usd
CY2022Q3	us-gaap	Gain Loss On Investments GainLossOnInvestments	-4400000	usd
CY2022Q3	us-gaap	Interest And Debt Expense InterestAndDebtExpense	47000000.0	usd
CY2021Q3	us-gaap	Net Investment Income NetInvestmentIncome	550200000	usd
CY2021Q3	us-gaap	Gain Loss On Investments GainLossOnInvestments	-100000	usd
	us-gaap	Net Investment Income NetInvestmentIncome	1662400000	usd
	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Claims Paid Current Year1 LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidCurrentYear1	2118600000	usd
	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Claims Paid Current Year1 LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidCurrentYear1	2225300000	usd
CY2022Q3	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	-3134700000	usd
CY2021Q3	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	3700000	usd
CY2021Q3	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	113900000	usd
	us-gaap	Other Comprehensive Income Loss Before Reclassifications Net Of Tax OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax	-3490700000	usd
	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-3488800000	usd
CY2020Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	374200000	usd
CY2021Q4	us-gaap	Liability For Claims And Claims Adjustment Expense LiabilityForClaimsAndClaimsAdjustmentExpense	23664700000	usd
CY2021Q4	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Net LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet	14966900000	usd
CY2020Q4	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Net LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet	15801300000	usd
	us-gaap	Supplemental Information For Property Casualty Insurance Underwriters Current Year Claims And Claims Adjustment Expense SupplementalInformationForPropertyCasualtyInsuranceUnderwritersCurrentYearClaimsAndClaimsAdjustmentExpense	5130100000	usd
	us-gaap	Premium Receivable Credit Loss Expense Reversal PremiumReceivableCreditLossExpenseReversal	-2800000	usd
	us-gaap	Payments For Losses And Loss Adjustment Expense PaymentsForLossesAndLossAdjustmentExpense	5169800000	usd
	unm	Reserves Ceded Pursuant To Reinsurance Transaction ReservesCededPursuantToReinsuranceTransaction	0	usd
CY2021Q3	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Net LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet	14914700000	usd
CY2021Q3	us-gaap	Reinsurance Receivables Incurred But Not Reported Claims ReinsuranceReceivablesIncurredButNotReportedClaims	8854800000	usd
	unm	Unum Us Group Long Term Disability Reserve Reduction Before Tax UnumUSGroupLongTermDisabilityReserveReductionBeforeTax	121000000	usd
	unm	Unum Us Group Life Reserve Reduction Before Tax UnumUSGroupLifeReserveReductionBeforeTax	34000000	usd
	unm	Net Reduction In Unpaid Claims As A Result Of Assumption Updates Before Tax NetReductionInUnpaidClaimsAsAResultOfAssumptionUpdatesBeforeTax	155000000	usd
	unm	Unum Us Group Long Term Disability Reserve Reduction Before Tax UnumUSGroupLongTermDisabilityReserveReductionBeforeTax	215000000	usd
	unm	Closed Block Long Term Care Reserve Increase Before Tax ClosedBlockLongTermCareReserveIncreaseBeforeTax	2100000	usd
	unm	Closed Block Individual Disability Reserve Increase Before Tax ClosedBlockIndividualDisabilityReserveIncreaseBeforeTax	6400000	usd
	unm	Net Reduction In Unpaid Claims As A Result Of Assumption Updates Before Tax NetReductionInUnpaidClaimsAsAResultOfAssumptionUpdatesBeforeTax	206500000	usd
CY2022Q3	us-gaap	Liability For Future Policy Benefits LiabilityForFuturePolicyBenefits	43880100000	usd
CY2022Q3	unm	Accident And Health Active Life Reserves AccidentAndHealthActiveLifeReserves	13355200000	usd
CY2021Q3	unm	Accident And Health Active Life Reserves AccidentAndHealthActiveLifeReserves	13016900000	usd
CY2021Q3	us-gaap	Premiums Earned Net PremiumsEarnedNet	2353700000	usd
	us-gaap	Premiums Earned Net PremiumsEarnedNet	7106400000	usd
CY2022Q3	us-gaap	Capitalized Computer Software Impairments1 CapitalizedComputerSoftwareImpairments1	0	usd
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	us-gaap	Capitalized Computer Software Impairments1 CapitalizedComputerSoftwareImpairments1	0	usd
	us-gaap	Capitalized Computer Software Impairments1 CapitalizedComputerSoftwareImpairments1	12100000	usd
CY2021Q3	us-gaap	Premiums Receivable Allowance For Doubtful Accounts PremiumsReceivableAllowanceForDoubtfulAccounts	32600000	usd
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CY2022Q3	us-gaap	Net Income Loss NetIncomeLoss	410700000	usd
CY2021Q3	us-gaap	Net Income Loss NetIncomeLoss	328600000	usd
	us-gaap	Net Income Loss NetIncomeLoss	1034600000	usd
	us-gaap	Net Income Loss NetIncomeLoss	664500000	usd
CY2022Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	200035300	shares
CY2022Q3	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	1614900	shares
	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	623300	shares
CY2022Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.05
CY2022Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.04
CY2022Q3	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount		shares
	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	100000	shares
CY2021Q2	us-gaap	Premiums Receivable Gross PremiumsReceivableGross	576300000	usd
CY2021Q3	us-gaap	Premium Receivable Credit Loss Expense Reversal PremiumReceivableCreditLossExpenseReversal	1600000	usd
CY2022Q3	us-gaap	Treasury Stock Shares Acquired TreasuryStockSharesAcquired	1164800	shares
CY2021Q3	us-gaap	Treasury Stock Shares Acquired TreasuryStockSharesAcquired	0	shares
	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	0	usd
CY2022Q3	unm	Shares Repurchased Commissions SharesRepurchasedCommissions		usd
	unm	Shares Repurchased Commissions SharesRepurchasedCommissions	100000	usd
CY2022Q3	us-gaap	Premiums Receivable Allowance For Doubtful Accounts PremiumsReceivableAllowanceForDoubtfulAccounts	31400000	usd
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CY2022Q2	us-gaap	Premiums Receivable Gross PremiumsReceivableGross	593400000	usd
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2022 Q4 Form 10-Q Financial Statement

#000000551322000156 Filed on November 02, 2022

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2022 Q4 Form 10-Q Financial Statement

#000000551322000156 Filed on November 02, 2022

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