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Liability for Unpaid Claims and Claims Adjustment Expense (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense |  |  |
Balance at January 1 | $ 24,535.6 us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense | $ 24,567.1 us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense | $ 24,586.5 us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense
Less Reinsurance Recoverable | 2,072.8 us-gaap_ReinsuranceReceivablesIncurredButNotReportedClaims | 2,006.0 us-gaap_ReinsuranceReceivablesIncurredButNotReportedClaims | 2,042.6 us-gaap_ReinsuranceReceivablesIncurredButNotReportedClaims
Net Balance at January 1 | 22,462.8 us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet | 22,561.1 us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet | 22,543.9 us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet
Incurred Related to |  |  |
Current Year | 4,851.5 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersCurrentYearClaimsAndClaimsAdjustmentExpense | 4,751.9 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersCurrentYearClaimsAndClaimsAdjustmentExpense | 4,946.2 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersCurrentYearClaimsAndClaimsAdjustmentExpense
Paid Related to |  |  |
Current Year | (1,702.3)us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidCurrentYear1 | (1,657.3)us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidCurrentYear1 | (1,715.4)us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidCurrentYear1
Prior Years | (4,547.4)us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidPriorYears1 | (4,419.4)us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidPriorYears1 | (4,386.6)us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidPriorYears1
Total Paid | (6,249.7)us-gaap_PaymentsForLossesAndLossAdjustmentExpense | (6,076.7)us-gaap_PaymentsForLossesAndLossAdjustmentExpense | (6,102.0)us-gaap_PaymentsForLossesAndLossAdjustmentExpense
Net Balance at December 31 | 22,127.1 us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet | 22,462.8 us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet | 22,561.1 us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet
Plus Reinsurance Recoverable | 2,066.9 us-gaap_ReinsuranceReceivablesIncurredButNotReportedClaims | 2,072.8 us-gaap_ReinsuranceReceivablesIncurredButNotReportedClaims | 2,006.0 us-gaap_ReinsuranceReceivablesIncurredButNotReportedClaims
Balance at December 31 | 24,194.0 us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense | 24,535.6 us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense | 24,567.1 us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense
Amount Related to Interest |  |  |
Incurred Related to |  |  |
Prior Years | 1,214.7 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / unm_NatureofClaimIncurredAxis = unm_AmountRelatedtoInterestMember | 1,230.0 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / unm_NatureofClaimIncurredAxis = unm_AmountRelatedtoInterestMember | 1,247.6 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / unm_NatureofClaimIncurredAxis = unm_AmountRelatedtoInterestMember
Incurred Claims |  |  |
Incurred Related to |  |  |
Prior Years | (13.5)us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / unm_NatureofClaimIncurredAxis = unm_IncurredClaimsMember | (44.7)us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / unm_NatureofClaimIncurredAxis = unm_IncurredClaimsMember | (175.7)us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / unm_NatureofClaimIncurredAxis = unm_IncurredClaimsMember
Foreign Currency |  |  |
Incurred Related to |  |  |
Prior Years | (138.7)us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / unm_NatureofClaimIncurredAxis = unm_ForeignCurrencyMember | 41.2 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / unm_NatureofClaimIncurredAxis = unm_ForeignCurrencyMember | 101.1 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / unm_NatureofClaimIncurredAxis = unm_ForeignCurrencyMember
Operating Expense |  |  |
Incurred Related to |  |  |
Total Incurred | $ 5,914.0 us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1 / us-gaap_NatureOfExpenseAxis = us-gaap_OperatingExpenseMember | $ 5,978.4 us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1 / us-gaap_NatureOfExpenseAxis = us-gaap_OperatingExpenseMember | $ 6,119.2 us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1 / us-gaap_NatureOfExpenseAxis = us-gaap_OperatingExpenseMember

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- Definition The amount needed to reflect the estimated ultimate cost of settling claims relating to insured events that have occurred on or before the balance sheet date, whether or not reported to the insurer at that date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (a),(b),(c) -URI http://asc.fasb.org/extlink&oid=6482485&loc=d3e14764-158437 + Details
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- Definition Amount of payments to settle claims incurred in the current period and related claims settlement costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6482485&loc=d3e14764-158437 + Details
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- Definition Amount of payments to settle claims incurred in prior periods and related claims settlement costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6482485&loc=d3e14764-158437 + Details
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- Definition Amount of expense for claims incurred and costs incurred in the claim settlement process. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6482485&loc=d3e14764-158437 + Details
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- Definition Liability as of the balance sheet date for amounts representing estimated cost of settling unpaid claims under the terms of the underlying insurance policies, less estimated reinsurance recoveries on such claims. This includes an estimate for claims which have been incurred but not reported. Claim adjustment expenses represent the costs estimated to be incurred in the settlement of unpaid claims. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6482485&loc=d3e14764-158437 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Financial Reporting Release (FRR) -Number 403 -Paragraph 04 -Subparagraph b Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 13 -Subparagraph a -Article 7 + Details
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- Definition Amount of payments to settle insured claims and pay costs incurred in the claims settlement process. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3536-108585 + Details
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- Definition Estimated amount after valuation allowance of reinsurance recoverables, due from reinsurers for incurred claims not yet reported, and claims settlement expenses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 310 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6485522&loc=d3e21412-158489 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 310 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6485522&loc=d3e21409-158489 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 6 -Article 7 + Details
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- Definition Amount of expense for claims incurred in the current reporting period and related claims settlement costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-18) -URI http://asc.fasb.org/extlink&oid=34713774&loc=d3e575016-122915 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 18 -Article 12 + Details
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- Definition Amount of expense for claims incurred in prior reporting periods and related claims settlement costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-18) -URI http://asc.fasb.org/extlink&oid=34713774&loc=d3e575016-122915 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 18 -Article 12 + Details
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