XML 17 R39.htm IDEA: XBRL DOCUMENT
v2.4.0.6

Mortgage Loans by Geographic Region (Detail) (USD $) In Millions, unless otherwise specified | Mar. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage Loans | $ 1,730.4 | $ 1,712.7
Percent of Total | 100.00% | 100.00%
New England |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage Loans | 113.2 | 114.3
Percent of Total | 6.50% | 6.70%
Mid-Atlantic |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage Loans | 158.9 | 160.0
Percent of Total | 9.20% | 9.30%
East North Central |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage Loans | 233.1 | 224.7
Percent of Total | 13.50% | 13.10%
West North Central |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage Loans | 158.0 | 160.8
Percent of Total | 9.10% | 9.40%
South Atlantic |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage Loans | 437.8 | 440.9
Percent of Total | 25.30% | 25.70%
East South Central |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage Loans | 79.1 | 79.6
Percent of Total | 4.60% | 4.70%
West South Central |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage Loans | 157.8 | 159.5
Percent of Total | 9.10% | 9.30%
Mountain |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage Loans | 89.6 | 90.5
Percent of Total | 5.20% | 5.30%
Pacific |  |
Mortgage Loans on Real Estate [Line Items] |  |
Mortgage Loans | $ 302.9 | $ 282.4
Percent of Total | 17.50% | 16.50%

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FASB -Name Statement of Financial Accounting Standard (FAS) -Number 60 -Paragraph 47 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: 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 3: 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