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Statutory Financial Information - Additional Details (Detail) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 Fairwind Insurance Company USD ($) | Dec. 31, 2013 Fairwind Insurance Company USD ($) | Dec. 31, 2014 Unum Limited GBP (£) | Dec. 31, 2014 United States Traditional Insurance Subsidiaries USD ($) | Dec. 31, 2013 United States Traditional Insurance Subsidiaries USD ($) | Dec. 31, 2012 United States Traditional Insurance Subsidiaries USD ($)
Statutory Accounting Practices |  |  |  |  |  |
Statutory Accounting Practices, Permitted Practice, Amount | $ 200 us-gaap_StatutoryAccountingPracticesPermittedPracticeAmount / dei_LegalEntityAxis = unm_FairwindInsuranceCompanyMember | $ 176 us-gaap_StatutoryAccountingPracticesPermittedPracticeAmount / dei_LegalEntityAxis = unm_FairwindInsuranceCompanyMember |  |  |  |
Statutory Net Income |  |  | 54.6 us-gaap_StatutoryAccountingPracticesStatutoryNetIncomeAmount / dei_LegalEntityAxis = unm_UnumLimitedMember | 623.1 us-gaap_StatutoryAccountingPracticesStatutoryNetIncomeAmount / dei_LegalEntityAxis = unm_UnitedStatesTraditionalInsuranceSubsidiariesMember | 584.5 us-gaap_StatutoryAccountingPracticesStatutoryNetIncomeAmount / dei_LegalEntityAxis = unm_UnitedStatesTraditionalInsuranceSubsidiariesMember | 624.5 us-gaap_StatutoryAccountingPracticesStatutoryNetIncomeAmount / dei_LegalEntityAxis = unm_UnitedStatesTraditionalInsuranceSubsidiariesMember
Statutory Combined Capital and Surplus |  |  | 425.2 us-gaap_StatutoryAccountingPracticesStatutoryCapitalAndSurplusBalance / dei_LegalEntityAxis = unm_UnumLimitedMember | 3,462.8 us-gaap_StatutoryAccountingPracticesStatutoryCapitalAndSurplusBalance / dei_LegalEntityAxis = unm_UnitedStatesTraditionalInsuranceSubsidiariesMember | 3,450.5 us-gaap_StatutoryAccountingPracticesStatutoryCapitalAndSurplusBalance / dei_LegalEntityAxis = unm_UnitedStatesTraditionalInsuranceSubsidiariesMember |
Statutory Accounting Practices, Statutory Amount Available for Dividend Payments |  |  | 166.6 us-gaap_StatutoryAccountingPracticesStatutoryAmountAvailableForDividendPayments / dei_LegalEntityAxis = unm_UnumLimitedMember | 604.9 us-gaap_StatutoryAccountingPracticesStatutoryAmountAvailableForDividendPayments / dei_LegalEntityAxis = unm_UnitedStatesTraditionalInsuranceSubsidiariesMember |  |
Cash and Securities Segregated under Federal and Other Regulations |  |  |  | $ 279.1 us-gaap_CashAndSecuritiesSegregatedUnderFederalAndOtherRegulations / dei_LegalEntityAxis = unm_UnitedStatesTraditionalInsuranceSubsidiariesMember | $ 280.5 us-gaap_CashAndSecuritiesSegregatedUnderFederalAndOtherRegulations / dei_LegalEntityAxis = unm_UnitedStatesTraditionalInsuranceSubsidiariesMember |

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- Definition Amount of cash subject to withdrawal restrictions, restricted deposits held as compensating balances, and cash and securities segregated in compliance with regulations (such as cash deposited in a special reserve account for the exclusive benefit of customers). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 305 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6478312&loc=d3e61473-112792 + Details
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- Definition Amount of each item listed to reconcile the differences as of the balance sheet date resulting from applying state permitted statutory accounting practices rather than statutory accounting practices permitted by National Association of Insurance Commissioners. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 505 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6486098&loc=d3e24746-158529 + Details
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- Definition Amount of dividends available for payment after computation of statutory restrictions on capital surplus. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(e)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph e -Article 4 + Details
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- Definition The amount of statutory capital and surplus (stockholders' equity) as of the balance sheet date using prescribed or permitted statutory accounting practices (rather than GAAP, if different) of the state or country. + 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 210.7-03.23(c)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6486098&loc=d3e24708-158529 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 24 -Subparagraph c -Article 7 + Details
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- Definition Amount of net income for the period determined using accounting principles prescribed or permitted by insurance regulators. + 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 210.7-03.23(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 24 -Subparagraph c -Article 7 + Details
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