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Stock-Based Compensation Expense (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award |  |  |
Allocated Share-based Compensation Expense | $ 22.6 us-gaap_AllocatedShareBasedCompensationExpense | $ 23.6 us-gaap_AllocatedShareBasedCompensationExpense | $ 24.2 us-gaap_AllocatedShareBasedCompensationExpense
Allocated Share-based Compensation Expense, Net of Tax | 14.9 us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax | 15.6 us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax | 15.6 us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax
Performance Share Units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |
Allocated Share-based Compensation Expense | 2.5 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember | 1.1 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember | 0 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember
Restricted Stock Units and Cash-Settled Awards |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |
Allocated Share-based Compensation Expense | 19.0 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = unm_RestrictedstockunitsandcashsettledawardsDomain | 21.0 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = unm_RestrictedstockunitsandcashsettledawardsDomain | 20.9 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = unm_RestrictedstockunitsandcashsettledawardsDomain
Stock Options |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |
Allocated Share-based Compensation Expense | 0.6 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | 1.0 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | 2.7 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember
Other Awards |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |
Allocated Share-based Compensation Expense | $ 0.5 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOwnershipPlanESOPPlanDomain | $ 0.5 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOwnershipPlanESOPPlanDomain | $ 0.6 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOwnershipPlanESOPPlanDomain

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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- Definition The amount of expense, net of income tax, recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References No definition available. + Details
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