XML 85 R59.htm IDEA: XBRL DOCUMENT
v2.4.1.9

Mortgage Loans by Property Type and Geographic Region (Detail) (USD $) In Millions, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
--- | --- | ---
Mortgage Loans on Real Estate |  |
Mortgage Loans | $ 1,856.6 us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet | $ 1,815.1 us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
Percent of Total | 100.00%unm_PercentageOfLoanPortfolio | 100.00%unm_PercentageOfLoanPortfolio
Apartment |  |
Mortgage Loans on Real Estate |  |
Mortgage Loans | 110.1 us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_ApartmentBuildingMember | 61.1 us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_ApartmentBuildingMember
Percent of Total | 5.90%unm_PercentageOfLoanPortfolio / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_ApartmentBuildingMember | 3.30%unm_PercentageOfLoanPortfolio / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_ApartmentBuildingMember
Industrial |  |
Mortgage Loans on Real Estate |  |
Mortgage Loans | 542.9 us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_IndustrialPropertyMember | 567.8 us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_IndustrialPropertyMember
Percent of Total | 29.20%unm_PercentageOfLoanPortfolio / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_IndustrialPropertyMember | 31.30%unm_PercentageOfLoanPortfolio / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_IndustrialPropertyMember
Office |  |
Mortgage Loans on Real Estate |  |
Mortgage Loans | 794.0 us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_OfficeBuildingMember | 776.5 us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_OfficeBuildingMember
Percent of Total | 42.80%unm_PercentageOfLoanPortfolio / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_OfficeBuildingMember | 42.80%unm_PercentageOfLoanPortfolio / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_OfficeBuildingMember
Retail |  |
Mortgage Loans on Real Estate |  |
Mortgage Loans | 409.6 us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_RetailSiteMember | 409.7 us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_RetailSiteMember
Percent of Total | 22.10%unm_PercentageOfLoanPortfolio / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_RetailSiteMember | 22.60%unm_PercentageOfLoanPortfolio / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_RetailSiteMember
New England |  |
Mortgage Loans on Real Estate |  |
Mortgage Loans | 105.6 us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet / invest_InvestmentGeographicRegionAxis = unm_NewEnglandMember | 100.9 us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet / invest_InvestmentGeographicRegionAxis = unm_NewEnglandMember
Percent of Total | 5.70%unm_PercentageOfLoanPortfolio / invest_InvestmentGeographicRegionAxis = unm_NewEnglandMember | 5.60%unm_PercentageOfLoanPortfolio / invest_InvestmentGeographicRegionAxis = unm_NewEnglandMember
Mid-Atlantic |  |
Mortgage Loans on Real Estate |  |
Mortgage Loans | 179.4 us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet / invest_InvestmentGeographicRegionAxis = unm_MiddleAtlanticMember | 191.5 us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet / invest_InvestmentGeographicRegionAxis = unm_MiddleAtlanticMember
Percent of Total | 9.70%unm_PercentageOfLoanPortfolio / invest_InvestmentGeographicRegionAxis = unm_MiddleAtlanticMember | 10.50%unm_PercentageOfLoanPortfolio / invest_InvestmentGeographicRegionAxis = unm_MiddleAtlanticMember
East North Central |  |
Mortgage Loans on Real Estate |  |
Mortgage Loans | 210.6 us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet / invest_InvestmentGeographicRegionAxis = unm_EastNorthCentralMember | 244.3 us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet / invest_InvestmentGeographicRegionAxis = unm_EastNorthCentralMember
Percent of Total | 11.40%unm_PercentageOfLoanPortfolio / invest_InvestmentGeographicRegionAxis = unm_EastNorthCentralMember | 13.50%unm_PercentageOfLoanPortfolio / invest_InvestmentGeographicRegionAxis = unm_EastNorthCentralMember
West North Central |  |
Mortgage Loans on Real Estate |  |
Mortgage Loans | 166.2 us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet / invest_InvestmentGeographicRegionAxis = unm_WestNorthCentralMember | 162.3 us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet / invest_InvestmentGeographicRegionAxis = unm_WestNorthCentralMember
Percent of Total | 8.90%unm_PercentageOfLoanPortfolio / invest_InvestmentGeographicRegionAxis = unm_WestNorthCentralMember | 8.90%unm_PercentageOfLoanPortfolio / invest_InvestmentGeographicRegionAxis = unm_WestNorthCentralMember
South Atlantic |  |
Mortgage Loans on Real Estate |  |
Mortgage Loans | 453.6 us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet / invest_InvestmentGeographicRegionAxis = unm_SouthAtlanticMember | 447.7 us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet / invest_InvestmentGeographicRegionAxis = unm_SouthAtlanticMember
Percent of Total | 24.40%unm_PercentageOfLoanPortfolio / invest_InvestmentGeographicRegionAxis = unm_SouthAtlanticMember | 24.70%unm_PercentageOfLoanPortfolio / invest_InvestmentGeographicRegionAxis = unm_SouthAtlanticMember
East South Central |  |
Mortgage Loans on Real Estate |  |
Mortgage Loans | 75.3 us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet / invest_InvestmentGeographicRegionAxis = unm_EastSouthCentralMember | 67.7 us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet / invest_InvestmentGeographicRegionAxis = unm_EastSouthCentralMember
Percent of Total | 4.10%unm_PercentageOfLoanPortfolio / invest_InvestmentGeographicRegionAxis = unm_EastSouthCentralMember | 3.70%unm_PercentageOfLoanPortfolio / invest_InvestmentGeographicRegionAxis = unm_EastSouthCentralMember
West South Central |  |
Mortgage Loans on Real Estate |  |
Mortgage Loans | 215.6 us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet / invest_InvestmentGeographicRegionAxis = unm_WestSouthCentralMember | 190.9 us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet / invest_InvestmentGeographicRegionAxis = unm_WestSouthCentralMember
Percent of Total | 11.60%unm_PercentageOfLoanPortfolio / invest_InvestmentGeographicRegionAxis = unm_WestSouthCentralMember | 10.50%unm_PercentageOfLoanPortfolio / invest_InvestmentGeographicRegionAxis = unm_WestSouthCentralMember
Mountain |  |
Mortgage Loans on Real Estate |  |
Mortgage Loans | 116.0 us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet / invest_InvestmentGeographicRegionAxis = unm_MountainMember | 101.9 us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet / invest_InvestmentGeographicRegionAxis = unm_MountainMember
Percent of Total | 6.20%unm_PercentageOfLoanPortfolio / invest_InvestmentGeographicRegionAxis = unm_MountainMember | 5.60%unm_PercentageOfLoanPortfolio / invest_InvestmentGeographicRegionAxis = unm_MountainMember
Pacific |  |
Mortgage Loans on Real Estate |  |
Mortgage Loans | $ 334.3 us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet / invest_InvestmentGeographicRegionAxis = unm_PacificMember | $ 307.9 us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet / invest_InvestmentGeographicRegionAxis = unm_PacificMember
Percent of Total | 18.00%unm_PercentageOfLoanPortfolio / invest_InvestmentGeographicRegionAxis = unm_PacificMember | 17.00%unm_PercentageOfLoanPortfolio / invest_InvestmentGeographicRegionAxis = unm_PacificMember

X
- Definition Percentage Of Loan Portfolio + References No definition available. + Details
Name: | unm_PercentageOfLoanPortfolio
Namespace Prefix: | unm_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The balance represents the amount of loans that are secured by real estate mortgages, offset by the reserve to cover probable credit losses on the loan portfolio. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(c)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Subparagraph c -Article 7 + Details
Name: | us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_MortgageLoansOnRealEstateLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | invest_InvestmentGeographicRegionAxis=unm_EastNorthCentralMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | invest_InvestmentGeographicRegionAxis=unm_EastSouthCentralMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | invest_InvestmentGeographicRegionAxis=unm_MiddleAtlanticMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | invest_InvestmentGeographicRegionAxis=unm_MountainMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | invest_InvestmentGeographicRegionAxis=unm_NewEnglandMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | invest_InvestmentGeographicRegionAxis=unm_PacificMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | invest_InvestmentGeographicRegionAxis=unm_SouthAtlanticMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | invest_InvestmentGeographicRegionAxis=unm_WestNorthCentralMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | invest_InvestmentGeographicRegionAxis=unm_WestSouthCentralMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis=us-gaap_ApartmentBuildingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis=us-gaap_IndustrialPropertyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis=us-gaap_OfficeBuildingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis=us-gaap_RetailSiteMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |