XML 77 R64.htm IDEA: XBRL DOCUMENT
v3.24.2

Policyholder Account Balance (Details) - USD ($) $ in Millions | 6 Months Ended |
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Dec. 31, 2023
Policyholder Account Balance [Roll Forward] |  |  |  |  |
Policyholders' Account Balances | $ 5,660.3 |  |  |  | $ 5,667.7
Operating Segments |  |  |  |  |
Policyholder Account Balance [Roll Forward] |  |  |  |  |
Policyholder Account Balance, before Reserves in excess of Account Balance, Beginning of Year | 5,514.2 |  | $ 5,598.6 |  |
Policyholder Account Balance, Premium Received | 76.7 |  | 85.1 |  |
Policyholder Account Balance, Policy Charge | (112.8) | [1] | (121.3) | [2] |
Policyholder Account Balance, Surrender and Withdrawal | (43.7) |  | (44.5) |  |
Policyholder Account Balance, Benefit Payment | (103.2) |  | (143.3) |  |
Policyholder Account Balance, Interest Expense | 165.9 |  | 187.3 |  |
Policyholder Account Balance, Increase (Decrease) from Other Change | 5.3 |  | (14.5) |  |
Policyholder Account Balance, before Reserves in excess of Account Balance, End of Period | 5,502.4 |  | 5,547.4 |  |
Policyholder Account Balance, Reserves in excess of Account Balance | 157.9 |  | 145.0 |  |
Policyholders' Account Balances | 5,660.3 |  | 5,692.4 |  |
Policyholder Account Balance, Reinsurance recoverable | 4,122.3 |  | 4,149.2 |  |
Policyholder Account Balance, After reinsurance recoverable | $ 1,538.0 |  | $ 1,543.2 |  |
Policyholder Account Balance, Weighted Average Crediting Rate | 6.20% |  | 6.90% |  |
Policyholder Account Balance, Net Amount at Risk | $ 14,512.4 | [3] | $ 15,581.8 | [4] |
Policyholder Account Balance, Cash Surrender Value | 5,437.8 |  | 5,399.5 |  |
Unum US | Voluntary Benefits |  |  |  |  |
Policyholder Account Balance [Roll Forward] |  |  |  |  |
Policyholder Account Balance, before Reserves in excess of Account Balance, Beginning of Year | 578.6 |  | 586.8 |  |
Policyholder Account Balance, Premium Received | 27.3 |  | 30.2 |  |
Policyholder Account Balance, Policy Charge | (28.8) | [1] | (30.7) | [2] |
Policyholder Account Balance, Surrender and Withdrawal | (16.8) |  | (16.4) |  |
Policyholder Account Balance, Benefit Payment | (3.3) |  | (5.4) |  |
Policyholder Account Balance, Interest Expense | 10.6 |  | 11.4 |  |
Policyholder Account Balance, Increase (Decrease) from Other Change | 5.1 |  | 4.6 |  |
Policyholder Account Balance, before Reserves in excess of Account Balance, End of Period | 572.7 |  | 580.5 |  |
Policyholder Account Balance, Reserves in excess of Account Balance | 101.8 |  | 96.7 |  |
Policyholders' Account Balances | 674.5 |  | 677.2 |  |
Policyholder Account Balance, Reinsurance recoverable | 0.9 |  | 1.0 |  |
Policyholder Account Balance, After reinsurance recoverable | $ 673.6 |  | $ 676.2 |  |
Policyholder Account Balance, Weighted Average Crediting Rate | 3.70% |  | 4.00% |  |
Policyholder Account Balance, Net Amount at Risk | $ 4,300.4 | [3] | $ 4,695.5 | [4] |
Policyholder Account Balance, Cash Surrender Value | 562.0 |  | 570.3 |  |
Colonial Life |  |  |  |  |
Policyholder Account Balance [Roll Forward] |  |  |  |  |
Policyholder Account Balance, before Reserves in excess of Account Balance, Beginning of Year | 852.9 |  | 852.4 |  |
Policyholder Account Balance, Premium Received | 40.5 |  | 43.8 |  |
Policyholder Account Balance, Policy Charge | (36.4) | [1] | (37.8) | [2] |
Policyholder Account Balance, Surrender and Withdrawal | (20.4) |  | (19.2) |  |
Policyholder Account Balance, Benefit Payment | (4.0) |  | (4.1) |  |
Policyholder Account Balance, Interest Expense | 17.1 |  | 17.1 |  |
Policyholder Account Balance, Increase (Decrease) from Other Change | 0.0 |  | (0.1) |  |
Policyholder Account Balance, before Reserves in excess of Account Balance, End of Period | 849.7 |  | 852.1 |  |
Policyholder Account Balance, Reserves in excess of Account Balance | 14.7 |  | 14.9 |  |
Policyholders' Account Balances | 864.4 |  | 867.0 |  |
Policyholder Account Balance, Reinsurance recoverable | 0.0 |  | 0.0 |  |
Policyholder Account Balance, After reinsurance recoverable | $ 864.4 |  | $ 867.0 |  |
Policyholder Account Balance, Weighted Average Crediting Rate | 4.10% |  | 4.10% |  |
Policyholder Account Balance, Net Amount at Risk | $ 8,461.9 | [3] | $ 9,042.3 | [4] |
Policyholder Account Balance, Cash Surrender Value | 816.4 |  | 807.7 |  |
Closed Block | Other Insurance Product Line |  |  |  |  |
Policyholder Account Balance [Roll Forward] |  |  |  |  |
Policyholder Account Balance, before Reserves in excess of Account Balance, Beginning of Year | 4,082.7 |  | 4,159.4 |  |
Policyholder Account Balance, Premium Received | 8.9 |  | 11.1 |  |
Policyholder Account Balance, Policy Charge | (47.6) | [1] | (52.8) | [2] |
Policyholder Account Balance, Surrender and Withdrawal | (6.5) |  | (8.9) |  |
Policyholder Account Balance, Benefit Payment | (95.9) |  | (133.8) |  |
Policyholder Account Balance, Interest Expense | 138.2 |  | 158.8 |  |
Policyholder Account Balance, Increase (Decrease) from Other Change | 0.2 |  | (19.0) |  |
Policyholder Account Balance, before Reserves in excess of Account Balance, End of Period | 4,080.0 |  | 4,114.8 |  |
Policyholder Account Balance, Reserves in excess of Account Balance | 41.4 |  | 33.4 |  |
Policyholders' Account Balances | 4,121.4 |  | 4,148.2 |  |
Policyholder Account Balance, Reinsurance recoverable | 4,121.4 |  | 4,148.2 |  |
Policyholder Account Balance, After reinsurance recoverable | $ 0.0 |  | $ 0.0 |  |
Policyholder Account Balance, Weighted Average Crediting Rate | 7.00% |  | 7.90% |  |
Policyholder Account Balance, Net Amount at Risk | $ 1,750.1 | [3] | $ 1,844.0 | [4] |
Policyholder Account Balance, Cash Surrender Value | $ 4,059.4 |  | $ 4,021.5 |  |
[1] | 1 Contracts included in the policyholder account balances are generally charged a premium and/or monthly assessments on the basis of the account balance.
[2] | 1 Contracts included in the policyholder account balances are generally charged a premium and/or monthly assessments on the basis of the account balance.
[3] | 2 For those guarantees of benefits that are payable in the event of death, the net amount at risk is generally defined as the current guaranteed minimum death benefit in excess of the current account balance at the balance sheet date.
[4] | 2 For those guarantees of benefits that are payable in the event of death, the net amount at risk is generally defined as the current guaranteed minimum death benefit in excess of the current account balance at the balance sheet date.

X
- Definition Policyholder Account Balance, After reinsurance recoverable + References No definition available. + Details
Name: | unm_PolicyholderAccountBalanceAfterReinsuranceRecoverable
Namespace Prefix: | unm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Policyholder Account Balance, before Reserves in excess of Account Balance + References No definition available. + Details
Name: | unm_PolicyholderAccountBalanceBeforeReservesInExcessOfAccountBalance
Namespace Prefix: | unm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Policyholder Account Balance, Reinsurance recoverable + References No definition available. + Details
Name: | unm_PolicyholderAccountBalanceReinsuranceRecoverable
Namespace Prefix: | unm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Policyholder Account Balance, Reserves in excess of Account Balance + References No definition available. + Details
Name: | unm_PolicyholderAccountBalanceReservesInExcessOfAccountBalance
Namespace Prefix: | unm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of cash to be paid to policyholder upon termination and surrender of long-duration contract issued by insurance entity. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 7A -Subparagraph (b)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480081/944-40-50-7A Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 29F -Publisher FASB -URI https://asc.fasb.org/1943274/2147480046/944-40-55-29F + Details
Name: | us-gaap_CashSurrenderValueDuePolicyholdersAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of interest expense for allocation to policyholder account balance. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 7A -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480081/944-40-50-7A Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 29F -Publisher FASB -URI https://asc.fasb.org/1943274/2147480046/944-40-55-29F Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479868/944-20-45-2 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 13J -Subparagraph (g) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480046/944-40-55-13J Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(6)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477250/944-220-S99-1 + Details
Name: | us-gaap_InterestCreditedToPolicyholdersAccountBalances
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of cash outflow to policyholder account balance from benefit payment. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 7A -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480081/944-40-50-7A Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 29F -Publisher FASB -URI https://asc.fasb.org/1943274/2147480046/944-40-55-29F Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 13J -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480046/944-40-55-13J + Details
Name: | us-gaap_PolicyholderAccountBalanceBenefitPayment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of increase (decrease) in liability for policyholder account balance from change, classified as other. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 7A -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480081/944-40-50-7A Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 29F -Publisher FASB -URI https://asc.fasb.org/1943274/2147480046/944-40-55-29F + Details
Name: | us-gaap_PolicyholderAccountBalanceIncreaseDecreaseFromOtherChange
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of guaranteed benefit in excess of current account balance of policyholder account balance. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 7A -Subparagraph (b)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480081/944-40-50-7A Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 29F -Publisher FASB -URI https://asc.fasb.org/1943274/2147480046/944-40-55-29F + Details
Name: | us-gaap_PolicyholderAccountBalanceNetAmountAtRisk
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of decrease in liability for policyholder account balance from policy charge. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 7A -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480081/944-40-50-7A Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 29F -Publisher FASB -URI https://asc.fasb.org/1943274/2147480046/944-40-55-29F Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 13J -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480046/944-40-55-13J + Details
Name: | us-gaap_PolicyholderAccountBalancePolicyCharge
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of cash inflow to policyholder account balance from premium received. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 7A -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480081/944-40-50-7A Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 29F -Publisher FASB -URI https://asc.fasb.org/1943274/2147480046/944-40-55-29F Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 13J -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480046/944-40-55-13J + Details
Name: | us-gaap_PolicyholderAccountBalancePremiumReceived
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
Name: | us-gaap_PolicyholderAccountBalanceRollForward
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of decrease in liability for policyholder account balance from contract redemption and withdrawal of funds. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 7A -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480081/944-40-50-7A Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 13J -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480046/944-40-55-13J Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 29F -Publisher FASB -URI https://asc.fasb.org/1943274/2147480046/944-40-55-29F + Details
Name: | us-gaap_PolicyholderAccountBalanceSurrenderAndWithdrawal
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Weighted-average crediting rate for liability for policyholder account balance, calculated at a point in time. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 7A -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480081/944-40-50-7A Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 29F -Publisher FASB -URI https://asc.fasb.org/1943274/2147480046/944-40-55-29F + Details
Name: | us-gaap_PolicyholderAccountBalanceWeightedAverageCreditingRate
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount due to policyholder. Includes, but is not limited to, unpaid policy dividend, retrospective refund, and undistributed earnings on participating business. Excludes future policy benefit and claim expense. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 7A -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480081/944-40-50-7A Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 7A -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480081/944-40-50-7A Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(14)(a)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 29F -Publisher FASB -URI https://asc.fasb.org/1943274/2147480046/944-40-55-29F Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 7A -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480081/944-40-50-7A + Details
Name: | us-gaap_PolicyholderFunds
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | srt_ConsolidationItemsAxis=us-gaap_OperatingSegmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=unm_UnumUsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=unm_VoluntaryBenefitsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=unm_ColonialLifeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=unm_ClosedBlockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=us-gaap_OtherInsuranceProductLineMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |