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Statutory Financial Information (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
United States Traditional Insurance Subsidiaries |  |  |
Statutory Accounting Practices |  |  |
Statutory Net Income | $ 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 Net Gain from Operations | 618.1 unm_CombinedNetGainLossFromOperations / dei_LegalEntityAxis = unm_UnitedStatesTraditionalInsuranceSubsidiariesMember | 617.5 unm_CombinedNetGainLossFromOperations / dei_LegalEntityAxis = unm_UnitedStatesTraditionalInsuranceSubsidiariesMember | 649.8 unm_CombinedNetGainLossFromOperations / dei_LegalEntityAxis = unm_UnitedStatesTraditionalInsuranceSubsidiariesMember
Statutory Combined Capital and Surplus | 3,462.8 us-gaap_StatutoryAccountingPracticesStatutoryCapitalAndSurplusBalance / dei_LegalEntityAxis = unm_UnitedStatesTraditionalInsuranceSubsidiariesMember | 3,450.5 us-gaap_StatutoryAccountingPracticesStatutoryCapitalAndSurplusBalance / dei_LegalEntityAxis = unm_UnitedStatesTraditionalInsuranceSubsidiariesMember |
Captive Reinsurers |  |  |
Statutory Accounting Practices |  |  |
Statutory Net Income | (123.0)us-gaap_StatutoryAccountingPracticesStatutoryNetIncomeAmount / dei_LegalEntityAxis = unm_CaptiveReinsurersMember | 13.3 us-gaap_StatutoryAccountingPracticesStatutoryNetIncomeAmount / dei_LegalEntityAxis = unm_CaptiveReinsurersMember | 40.8 us-gaap_StatutoryAccountingPracticesStatutoryNetIncomeAmount / dei_LegalEntityAxis = unm_CaptiveReinsurersMember
Statutory Combined Net Gain from Operations | (123.8)unm_CombinedNetGainLossFromOperations / dei_LegalEntityAxis = unm_CaptiveReinsurersMember | 13.6 unm_CombinedNetGainLossFromOperations / dei_LegalEntityAxis = unm_CaptiveReinsurersMember | 37.4 unm_CombinedNetGainLossFromOperations / dei_LegalEntityAxis = unm_CaptiveReinsurersMember
Statutory Combined Capital and Surplus | $ 1,668.3 us-gaap_StatutoryAccountingPracticesStatutoryCapitalAndSurplusBalance / dei_LegalEntityAxis = unm_CaptiveReinsurersMember | $ 1,679.4 us-gaap_StatutoryAccountingPracticesStatutoryCapitalAndSurplusBalance / dei_LegalEntityAxis = unm_CaptiveReinsurersMember |

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- Definition Statutory Accounting Practices Statutory Net Gain (Loss) from Operations + References No definition available. + 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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