XML 45 R77.htm IDEA: XBRL DOCUMENT
v2.4.1.9

Liability for Unpaid Claims - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013
Liability for Unpaid Claims and CAE Narrative Information |  |  |  |
Reserve Increase for Long-term Care | $ 698.2 unm_ReserveIncreaseforLongtermCareBeforeTax |  | $ 698.2 unm_ReserveIncreaseforLongtermCareBeforeTax |
Unclaimed Death Benefit Reserve Increase (Decrease) Before Taxes |  | 95.5 unm_UnclaimedDeathBenefitReserveIncreaseDecreaseBeforeTaxes |  | 95.5 unm_UnclaimedDeathBenefitReserveIncreaseDecreaseBeforeTaxes
Waiver of Premium Benefit Reserve Decrease Before Tax |  | 85.0 unm_WaiverofPremiumBenefitReserveIncreaseDecreaseBeforeTax |  |
Group Life |  |  |  |
Liability for Unpaid Claims and CAE Narrative Information |  |  |  |
Unclaimed Death Benefit Reserve Increase (Decrease) Before Taxes |  |  |  | 49.1 unm_UnclaimedDeathBenefitReserveIncreaseDecreaseBeforeTaxes / us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis = unm_GroupLifeMember
Unum US Voluntary Life |  |  |  |
Liability for Unpaid Claims and CAE Narrative Information |  |  |  |
Unclaimed Death Benefit Reserve Increase (Decrease) Before Taxes |  |  |  | 26.3 unm_UnclaimedDeathBenefitReserveIncreaseDecreaseBeforeTaxes / us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis = unm_UnumUSVoluntaryLifeMember
Colonial Voluntary Life |  |  |  |
Liability for Unpaid Claims and CAE Narrative Information |  |  |  |
Unclaimed Death Benefit Reserve Increase (Decrease) Before Taxes |  |  |  | 20.1 unm_UnclaimedDeathBenefitReserveIncreaseDecreaseBeforeTaxes / us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis = unm_ColonialVoluntaryLifeMember
Unum U.S. |  |  |  |
Liability for Unpaid Claims and CAE Narrative Information |  |  |  |
Unclaimed Death Benefit Reserve Increase (Decrease) Before Taxes |  |  |  | 75.4 unm_UnclaimedDeathBenefitReserveIncreaseDecreaseBeforeTaxes / us-gaap_StatementBusinessSegmentsAxis = unm_UnumUsMember
Waiver of Premium Benefit Reserve Decrease Before Tax |  |  |  | (85.0)unm_WaiverofPremiumBenefitReserveIncreaseDecreaseBeforeTax / us-gaap_StatementBusinessSegmentsAxis = unm_UnumUsMember
Unum U.S. | Group Life |  |  |  |
Liability for Unpaid Claims and CAE Narrative Information |  |  |  |
Waiver of Premium Benefit Reserve Decrease Before Tax |  |  |  | 85.0 unm_WaiverofPremiumBenefitReserveIncreaseDecreaseBeforeTax / us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis = unm_GroupLifeMember / us-gaap_StatementBusinessSegmentsAxis = unm_UnumUsMember
Claim Reserve Prior Year |  |  |  |
Liability for Unpaid Claims and CAE Narrative Information |  |  |  |
Reserve Increase for Long-term Care |  |  | 85.8 unm_ReserveIncreaseforLongtermCareBeforeTax / unm_InsuranceReserveTypeAxis = unm_ClaimReservePriorYearMember |
Claim Reserve Prior Year | Unum U.S. | Group Life |  |  |  |
Liability for Unpaid Claims and CAE Narrative Information |  |  |  |
Waiver of Premium Benefit Reserve Decrease Before Tax |  |  |  | $ 78.0 unm_WaiverofPremiumBenefitReserveIncreaseDecreaseBeforeTax / unm_InsuranceReserveTypeAxis = unm_ClaimReservePriorYearMember / us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis = unm_GroupLifeMember / us-gaap_StatementBusinessSegmentsAxis = unm_UnumUsMember

X
- Details
Name: | unm_LiabilityforUnpaidClaimsandCAENarrativeInformationLineItems
Namespace Prefix: | unm_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Reserve Increase for Long-term Care, Before Tax + References No definition available. + Details
Name: | unm_ReserveIncreaseforLongtermCareBeforeTax
Namespace Prefix: | unm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Unclaimed Death Benefit Reserve Increase (Decrease) - the before tax increase (decrease) adjustment to reserves for unclaimed death benefits as a result of searching the Death Master File. + References No definition available. + Details
Name: | unm_UnclaimedDeathBenefitReserveIncreaseDecreaseBeforeTaxes
Namespace Prefix: | unm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Waiver of premium benefit reserve increase (decrease) - the before tax adjustment increase (decrease) to reserves due to updated assumptions surrounding waiver of premium reserves + References No definition available. + Details
Name: | unm_WaiverofPremiumBenefitReserveIncreaseDecreaseBeforeTax
Namespace Prefix: | unm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | unm_InsuranceReserveTypeAxis=unm_ClaimReservePriorYearMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis=unm_ColonialVoluntaryLifeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis=unm_GroupLifeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis=unm_UnumUSVoluntaryLifeMember
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: |